WO1998000870A1 - Transistor a couche mince, son procede de production et circuits et affichage a cristaux liquides utilisant le transistor a couche mince - Google Patents
Transistor a couche mince, son procede de production et circuits et affichage a cristaux liquides utilisant le transistor a couche mince Download PDFInfo
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- WO1998000870A1 WO1998000870A1 PCT/JP1997/002233 JP9702233W WO9800870A1 WO 1998000870 A1 WO1998000870 A1 WO 1998000870A1 JP 9702233 W JP9702233 W JP 9702233W WO 9800870 A1 WO9800870 A1 WO 9800870A1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78696—Thin film transistors, i.e. transistors with a channel being at least partly a thin film characterised by the structure of the channel, e.g. multichannel, transverse or longitudinal shape, length or width, doping structure, or the overlap or alignment between the channel and the gate, the source or the drain, or the contacting structure of the channel
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13454—Drivers integrated on the active matrix substrate
Definitions
- the present invention relates to a thin film transistor, a method of manufacturing the same, a circuit using the same, and a liquid crystal display device.
- the present invention relates to a film transistor, a method of manufacturing the same, and a circuit and a liquid crystal display device using the same.
- Polycrystalline silicon thin film transistor that can be formed at low process temperature
- Low-temperature process polysilicon TFT is attracting attention as a device capable of forming a high-definition liquid crystal display with a built-in driver on a large glass substrate.
- FIG. 38A and FIG. 38B which is a cross-sectional view taken along the line BB of FIG. 38, show an example of a conventional polysilicon TFT, in which the polysilicon film forming the source and drain regions is on the lower side.
- the top gate type TFT in which the gate electrode is located on the upper side is shown.
- the polysilicon TFT is an example of an N-channel TFT.
- a buffer layer 2 made of a silicon oxide film is formed on a glass substrate 1, and a polysilicon thin film 3 is formed thereon. Further, a gate insulating film 4 made of a silicon oxide film covering the polysilicon thin film 3 is formed, and a gate electrode 5 made of a tantalum nitride film, an aluminum (A 1) film or the like is formed. Then, a source region 6 and a drain region 7 which are N-type impurity introduction regions are formed in portions of the polysilicon thin film 3 other than immediately below the gate electrode. In addition, an interlayer insulating film 8 made of a silicon oxide film is formed, contact holes 9 and 9 are opened, and a source electrode 10 and a drain electrode 11 are formed.
- the adoption of the structure is attracting attention.
- the S0I structure means that a single-crystal silicon layer is formed on a silicon substrate with a silicon oxide film Things.
- the effect of the substrate floating effect becomes remarkable because the transistor formation region and the supporting substrate are electrically insulated.
- a problem caused by the substrate floating effect is, for example, a decrease in breakdown voltage between the source and the drain.
- This mechanism is based on the fact that holes generated in the electric field region near the drain region accumulate in the lower part of the channel and raise the potential of the channel part. This is because the parasitic bipolar transistor serving as the collector is turned on.
- TFT of polycrystalline silicon has a large leakage current (off-flow) at the time of storage and a large variation in microstructure compared to a single-crystal silicon transistor. This tendency is more remarkable in the TF formed by the low-temperature process than in the TF formed by the ⁇ temperature process.
- the leak current (off current) of the TFT in the pixel portion is large, the luminance fluctuation of the display screen becomes large, and if the leak current (off current) varies, it becomes difficult to design the TFT.
- the present invention has been made to solve the above-mentioned problems, and it is intended to reduce the deterioration of characteristics, reduce the leak current (off current) of a TFT, and reduce the leak current (off current). It is an object to provide a thin film transistor having a structure for suppressing variation, a method for manufacturing the same, a circuit using the same, and a liquid crystal display device. Disclosure of the invention In order to achieve the above object, a thin film transistor according to the present invention is formed such that a channel region formed on a non-single-crystal silicon thin film on a substrate is separated from the non-single-crystal silicon thin film so as to sandwich the channel region. And a carrier of a conductivity type opposite to the first conductivity type generated in a high electric field region near the first region or the second region. A carrier injection region is provided for flowing.
- the carrier injection region into which the hot carriers generated in the electric field region flow can be removed, so that the hot carriers can be introduced into the first region or the second region as compared with the conventional film transistor. Therefore, characteristic deterioration can be greatly reduced.
- the transistor according to the present invention includes a channel region formed in a non-consolidated silicon film on a plate and a first conductivity type formed in the non-consolidated silicon thin film so as to sandwich the channel region.
- a plurality of i3 regions may be formed on the non-single-crystal silicon thin film.
- the third and fifth regions may be formed in the non-single-crystal silicon film between at least one of the i-th region and the second region and the channel region.
- the third region may be formed in at least a part of the channel region.
- the first conductivity type may be a ⁇ type.
- the non-single-crystal silicon thin film may be a polycrystalline silicon thin film.
- the polycrystalline silicon thin film having the channel region, the first region, and the second region may be formed by a low-temperature process.
- a thin film transistor according to the present invention includes a channel region formed in a non-single-crystal silicon thin film on a substrate and a first region of a first conductivity type formed in the non-single-crystal silicon thin film so as to sandwich the channel region. And a second region, wherein the width of at least the channel region of the non-single-crystal silicon thin film is equal to the first region and the second region. Greater than the minimum width of the area.
- the width of the channel region is preferably 50 m or more.
- the width of the channel region is preferably 100 m or more.
- a thin film transistor includes: a plurality of non-single-crystal silicon thin films formed on a substrate so as to intersect a gate electrode; a channel region formed in each of the non-single-crystal silicon thin films; And a first region and a second region of a first conductivity type formed so as to be separated from each other so as to sandwich the channel region.
- the first region and the second region of the plurality of non-single-crystal silicon films are different from each other. Each is connected to a common electrode.
- the channel width of each of the non-medium crystalline silicon films is preferably 10 m or less.
- the dimension between outermost sides of the plurality of non-single-crystal silicon films is preferably 50 m or more.
- the fear of the channel region is preferably 4 ⁇ m or less.
- a film transistor according to the present invention includes a semiconductor thin film land provided on a substrate, a source layer and a drain layer formed by selectively introducing impurities into the semiconductor thin film island, and an insulating film.
- a thin film transistor comprising: a gate provided to face the semiconductor film island through the gate;
- At least one of the source layer or the drain layer is formed at a predetermined distance inside from an outer edge of the semiconductor thin film island.
- the large leakage current (off-state current) of TFT is generally attributed to the “quality of the crystal”.
- the inventor of the present application has further studied variously.
- "the boundary between the edge of the high-concentration source layer or the drain layer constituting a part of the outer edge (outer periphery) of the thin film island and the gate electrode” is as follows. It was found that it had an important effect on the leakage current (off current) of the TFT.
- ⁇ ⁇ ⁇ concentration source and drain layers are provided inside the thin film island, By providing a “space” in the section, the space alleviates the aforementioned electric field applied to the source and drain layers. Therefore, the reduction of the leakage current (off current) and the suppression of its variation are achieved.
- a region avoiding the source layer and the drain layer, and at least a portion of the outer peripheral portion of the semiconductor thin film overlap with the gate electrode is an intrinsic layer in which impurities are not conducted. Is also good.
- Intrinsic layer an intrinsic layer
- Intrinsic ⁇ the depletion layer is easy to grow, and this depletion layer absorbs the electric field. Therefore, the field applied to the north-drain debris at the concentration of,: '5 is reduced, the leakage current (off flow) of TFT is reduced, and the variation is suppressed.
- a region avoiding the source ⁇ and drain, and at least a portion of the outer periphery of the semiconductor crotch island having a path with the gate electrode is opposite to the source layer and the drain / ⁇ ⁇ type. It may be composed of an impurity layer into which the impurity is introduced and an intrinsic layer connected to the impurity layer.
- the given distance from the outside of the semiconductor removal island to the source or the drain is not less than 1 / m and not more than 5 ⁇ m.
- the length be 1 m or more and 5 m or less.
- the semiconductor thin film island may be composed of polysilicon formed by annealing amorphous silicon.
- Polysilicon TFTs produced by a low-temperature process do not undergo high-temperature processing, so the crystal damage recovery is weak, and the TFT leakage current (off-current) tends to increase. Therefore, the application of the present invention is effective.
- the thin film transistor may have an offset in a relative positional relationship between the gate electrode and the drain layer.
- offset structure is effective in reducing the leakage current (off current) because the gate and drain do not overlap, but on the other hand, when the offset amount is large, the on-current is reduced. This leads to an increase in threshold voltage. Therefore, it is difficult to adjust the offset amount.
- the present invention is applied to a MOS transistor having an offset structure, it is possible to effectively reduce the leakage current (off-current) without increasing the offset amount so much, and to suppress the variation. It is easy to secure the ON ⁇ flow and measure the flow.
- the thin film transistor may have a dual gate structure in which two gate electrodes are arranged on the f-th row.
- the MOS transistor of the dual gate structure has a configuration in which two MOS transistors are connected in series.
- the adoption of the bright electric field relaxation structure reduces the leakage current of each MOSF layer, and reduces the reduction rate of one MOSFET (leakage current after application of the present invention / leakage current of application l!).
- F ( ⁇ 1) ” the leakage rate of the two M ⁇ SFETs during all breaks', the reduction rate of the current is“ F x F ”, which is more leakage current than the case of one M0 SFET. Is reduced.
- the thin ⁇ transistor according to the present invention includes: ⁇ .
- a first insulating film provided so as to overlap only with an outer edge portion of the semiconductor thin film island
- a second insulating film formed to cover the surface of the semiconductor thin film island and the first insulating film
- the first method is used to alleviate the electric field between the gate electrode and the source / drain.
- the insulating film is provided so as to overlap the outer edge of the film island, and the distance to the edge of the gate is increased by the thickness of the first insulating film.
- the electric field applied to the source / drain is reduced, the leak current (off current) of the TFT is reduced, and the variation is suppressed.
- a circuit according to the present invention includes the above thin film transistor.
- a liquid crystal display device is of a type with a built-in driver and has the above-mentioned thin film transistor.
- the thin film transistor of the present invention it is possible to realize the display and concealment of a liquid product that satisfies iiii with less occurrence of a circuit malfunction or the like.
- the transistor is preferably used in the circuit section.
- the film transistor is used as analog switch means of the circuit section.
- the liquid product display device has a thin film transistor in a pixel portion.
- the leakage current (off-it flow) of the TFT in the pixel area is reduced, and the luminance change on the display screen is reduced.
- variation in the leakage current (off current) of TFT is suppressed, and the active matrix: the immersion of the substrate is also 3 ⁇ 4. Therefore, a high-performance liquid crystal display device is realized.
- a liquid product according to the present invention is configured using the thin fl transistor.
- peripheral circuits such as three liquid crystal drivers are configured by the TFT of the present invention, a high-performance circuit can be formed. It is easy to form the circuit on an active matrix substrate. Therefore, a high-performance liquid crystal display device is realized.
- the method of manufacturing a thin film transistor according to the present invention comprises: a channel region formed in a non-single-crystal silicon thin film on a substrate; and a first conductive film formed in the non-single-crystal silicon thin film so as to sandwich the channel region.
- a method of manufacturing comprising: a silicon thin film forming step of forming a non-single-crystal silicon thin film on a substrate; and ion-implanting a part of the non-single-crystal silicon thin film with impurities of a conductivity type opposite to the first conductivity type.
- a third region forming step of forming the third region a gate electrode forming step of forming a gate electrode on a third region of the non-single-crystal silicon film via a gate insulating film;
- a channel region formed in a non-single-crystal silicon thin film on a substrate is separated from a non-single-bonded silicon film so as to sandwich the channel region.
- 1 ′ region and second region consisting of 1 ′, a question between the first region and the channel region, and opposite to the ⁇ 1 ′ formed both in the second region and the channel region A method for manufacturing a thin film transistor having a third region having the following shape: a silicon film forming step of forming a non-quasicrystalline silicon thin film on a substrate; Forming a gate electrode through a gate insulating film, and using a mask material that covers the first and second regions while using the gate electrode as a mask.
- the method for manufacturing a thin film transistor according to the present invention is used for a liquid crystal display device having a complementary type thin film transistor having both P-type and N-type, and a channel region formed in a non-single-crystal silicon thin film on a substrate; A first region and a second region of the first conductivity type formed so as to sandwich the channel region in the thin film and formed on the non-single-crystal silicon thin film between the first region and the second region; A method of manufacturing a thin film transistor having a third region having a conductivity type opposite to the first conductivity type, wherein the formation of the third region is performed by a transistor having a conductivity type opposite to the first conductivity type. This is performed simultaneously with the formation of the first and second regions of the transistor.
- the method for manufacturing a thin film transistor according to the present invention includes:
- the source layer and the drain layer can be formed inside the outer edge of the thin film island by self-alignment.
- FIGS. 1A and 1B are diagrams showing a thin film transistor according to the first embodiment of the present invention
- FIGS. 2A to 2C are diagrams showing a process of manufacturing a film transistor in order
- 3A to 3D are process flow charts showing the steps of manufacturing a thin film transistor in order
- FIGS. 4A and 4B are flow charts of a second embodiment of the present invention
- 5A to 5C are process flow charts showing a method of manufacturing a thin film transistor in order
- FIGS. 6A to 6C are diagrams showing a method of manufacturing a thin film transistor.
- 7A to 7D are process flow diagrams sequentially illustrating another method of manufacturing a thin film transistor
- FIGS. 8A and 8B are P-type processes.
- FIG. 9 A and FIG. 9 B is a diagram der showing a thin film transistor embodiment different shapes still another P-type impurity diffusion regions
- FIGS. 10A and 10B show a thin-film transistor according to a third embodiment of the present invention.
- FIGS. 11A and 1IB show a fourth embodiment of the present invention.
- FIG. 12 is a block diagram showing a configuration of a liquid crystal display device according to a fifth embodiment of the present invention.
- FIG. 13A is a diagram showing a TFT (n-type MO
- FIG. 13B is a diagram for explaining the leakage current (off current) of the SFET).
- FIG. 13B is a diagram showing the planar structure of the FT FT (n3 ⁇ 4MO SFET), and FIG. 14 is a diagram showing the polysilicon TF ⁇ ⁇ FIG. 15 is a diagram showing a current characteristic of a TFT, and FIG. 15 is a diagram for explaining a case where a leak current (off current) occurs in a polysilicon TFT.
- FIG. FIG. 17 is a meta diagram of the MOS FET according to the embodiment of FIG. 6 of the invention.
- FIG. 17 is a meta diagram of the MO SFET according to XVII-XVII of the device of FIG. A Fig.
- FIG. 16 is a cross-sectional view of the XVIII-XVIII-Ui-M SFET of the device shown in Fig. 16; Fig. 18B is a graph for demonstrating the effect of field relaxation;
- FIG. 20 is a diagram showing the relationship between the top of the source question (VGS) and the drain-to-source current (IDS).
- FIG. 20 shows the gate-to-source voltage (
- FIG. 21 is a diagram showing the relationship between VGS) and drain.Zose current (IDS).
- FIG. 21 is a metaphysical diagram of the device according to the embodiment of the present invention: FIG.
- FIG. 23A is a diagram showing the metastructure of the device according to the nine embodiments of the present invention
- FIG. 23B is a diagram showing an equivalent circuit thereof
- 124 is a diagram showing the present invention.
- Form of the tenth implementation of FIG. 25 is a diagram showing a planar structure (e side) and a sectional structure (lower side) of the device according to the present invention.
- FIG. 25 is a diagram showing a first step for manufacturing a CMOS (TFT) of the present invention.
- TFT CMOS
- FIG. 26 is a view showing a second step for producing the CMO S (TFT) of the present invention
- FIG. 27 is a third step for producing the CMO S (TFT) of the present invention
- FIG. 28 is a diagram showing a process
- FIG. 28 is a diagram showing a fourth process for manufacturing the CMOS (TFT) of the present invention
- FIG. 29 is a diagram showing the CMOS (TFT) of the present invention.
- FIG. 30 is a view showing a fifth step for manufacturing
- FIG. 30 is a view showing a sixth step for manufacturing the CMOS (TFT) of the present invention
- FIG. 31 is a view showing the step of the present invention.
- FIG. 32 is a block diagram illustrating a configuration of a liquid crystal display device
- FIG. 33 is a diagram illustrating a configuration of a liquid crystal display device
- FIG. 35 is a diagram illustrating an electronic device configured using the liquid crystal display device according to the embodiment
- FIG. 35 is a diagram illustrating a liquid crystal projector configured using the liquid crystal display device according to the embodiment
- 6 is a diagram illustrating a personal computer configured using the liquid crystal display device of the embodiment
- 13 7 is a base configured using the liquid crystal display device of the embodiment.
- FIG. 38A and FIG. 38B are diagrams each showing an example of a conventional thin film transistor.
- FIGS. 1A to 3D one embodiment of the present invention will be described with reference to FIGS. 1A to 3D.
- FIGS. 1A and 1B show a thin film transistor 16 of the present embodiment.
- the thin film transistor 16 is, for example, a polysilicon TFT used as an analog switch of a liquid product display. .
- FIG. 1A is a plan view of the transistor 16. As shown in this figure, both thin-film transistors 16 have N (3 ⁇ 4 1 ⁇ m) individual impurity expansion ⁇ (
- the ratio between the channel length L and the channel width W of the thin film transistor 16 is, for example, about 5 m / 100 / m.
- a source electrode 21 and a drain electrode 22 are respectively connected to the source region 17 and the drain region 18 through a plurality of contact holes 20, 20. Then, a P-type impurity diffusion region 23 continuously formed over the drain region 18, the channel region 30, and the source region 17 is formed.
- a carrier injection region, a third region having a conductivity type opposite to the first conductivity type are formed at a plurality of locations at regular intervals.
- the width of the P-type impurity diffusion region 23 is about 5 m, and the distance between the P-type impurity diffusion regions 23 is about 5 m.
- FIG. 1B is a sectional view taken along the line II of FIG. 1A.
- the glass On a substrate 24, a base insulating film 25 made of a silicon oxide film, a polycrystalline silicon thin film 26 in which source and drain regions 17 and 18 and a P-type impurity diffusion region 23 are formed are sequentially formed. Then, a gate electrode 19 is formed thereon via a gate insulating film 27.
- an interlayer insulating film 28 made of a silicon oxide film is formed thereon, and contact holes 20, 20 penetrating through the interlayer insulating film 28 and leading to the source region 17 and the drain region 18 are opened. 21. Drain electrode 22 is formed.
- the manufacturing method described below uses a CVD method instead of a thermal oxidation method to form a gate insulating film in a row, and manufactures at a low process temperature of 450 ° C or less throughout the entire process. is there. Thereby, glass can be used as the material of the substrate.
- a silicon oxide film having a film thickness of about 100 to 500 nm is formed on the entire surface of a glass substrate 24 by using a CVD method to form a base insulating film 25.
- an amorphous silicon film having a thickness of about 50 nm is formed on the entire surface on the ground 25 using a CVD method using disilane (S izH or monosilane (S i) as a raw material.
- the polycrystal is formed by excimer laser annealing of e C 1, and the polycrystalline silicon I film 26 is patterned by photolithography-etching technology known in the art. Film formation process).
- a photoresist pattern 29 in which only a region where a P-type impurity diffusion region is to be formed is opened, ion doping using B 2 H fi / H 2 is performed.
- a P-type impurity diffusion region 23 is formed (third region forming step).
- the dose during ion doping is, for example, about 1 to 10 ⁇ 10 15 atoms / cm 2.
- ECR-CVD Electro Cyclotron Resonance
- a gate insulating film 27 made of a silicon oxide film having a thickness of about 120 nm is formed by using a Chemical Vapor Deposition method or the like.
- a tantalum film having a thickness of about 600 to 800 nm is deposited on the entire surface by a sputtering method, and as shown in FIG. (Gate electrode forming step).
- ion doping using PH : i / H 2 is performed using the gate electrode 19 as a mask, thereby forming a source region 17, which is an N-type impurity diffusion region, and a drain region 17.
- the area 18 is formed (first and second area forming steps).
- the dose during ion doping may be about 1 to 10 ⁇ 10 15 atoms / cm ⁇ , but is set to be smaller than the dose S of B 2 ⁇ / ⁇ in the ion doping step of FIG. 2B. .
- both the ⁇ -type impurity and the N-type impurity are introduced into the channel region 30 and the region 23 a of the source and drain regions 17 and 18. By setting as follows, the region 23a remains ⁇ -shaped. Then, N annealing at 300 ° C and 2 o'clock is performed.
- an insulating film 28 made of a silicon oxide film having a thickness of about 500 to 100 nm is formed by the CVD method.
- contact holes 20 and 20 were opened to the source region 17 and the drain region 18 on the polycrystalline silicon thin film 26 through the layer interface fl 28.
- an A 1 —Si—Cu film is deposited on the entire surface, and is patterned to form a lease electrode 21 and a drain electrode 22.
- the thin film transistor 16 of the present embodiment when a voltage is applied between the source i, the pole 21 1 and the drain 22 and the pole 22 when the analog switch is turned on, the voltage is applied from the source region 17 to the drain region 18.
- the electrons are injected, the electrons are accelerated in an electric field region near the drain region 18 and photo carriers (electron-hole pairs) are generated by impact ionization.
- the ⁇ -type impurity diffusion region 23 is provided in the drain region 18, a part of the generated holes is potential. Flows into the ⁇ -type impurity diffusion region 23 with a low density.
- the amount of holes injected into the source region 17 is significantly smaller than that of the conventional thin film transistor, so that the characteristic degradation that the Vgs-Ids characteristic curve moves to the depletion side can be greatly reduced. it can.
- the P-type impurity diffusion region 23 is formed only at one place. However, since holes are provided evenly at a plurality of locations, holes generated at any location in the drain region 18 can easily flow into the P-type impurity diffusion region 23, and the effect of reducing characteristic deterioration can be enhanced.
- the P-type impurity diffusion region 23 has a structure in which the source region 17 and the drain region 18 are connected.
- the P-type impurity diffusion region is independent of the channel region. It may be a structure formed by forming.
- FIGS. 4A to 7D an embodiment of the present invention will be described with reference to FIGS. 4A to 7D.
- FIGS. 4A and 4] are views showing the open-ended transistor 31 of the present invention
- FIG. 4B is a section IV-IV line iWM of FIG. 4B.
- the thin film transistor 31 of the present embodiment is a detransistor of the form of application of 1 )
- 1 and i have only the structure of the P-type impurity diffusion region.
- 1164B the same components as those in FIGS. 1A and 1B are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
- the thin film transistor 31 has a source region 17 (first region) and a drain region 18 (second region), both of which are N-type (first conductivity type) impurity diffusion regions. Region) and a gate; a ⁇ pole 19, and a channel fi region 30 immediately below the gate electrode 19.
- a source electrode 21 and a drain electrode 22 are respectively provided through a plurality of contact holes 20, 20,.
- Each of the plurality of P-type impurity diffusion regions 32, 32,... (Carrier injection region, third region) has a drain except for the channel region 30. It is formed in the region 18 and the source region 17 and is configured to be divided into these two regions.
- a silicon oxide film having a film thickness of about 100 to 500 nm is formed on the entire surface of the glass substrate 24 by using a CVD method to form a base insulating film 25.
- an amorphous silicon thin film having a thickness of about 50 nm is formed on the entire surface of the base insulating film 25 by a CVD method using disilane or monosilane as a raw material.
- Perform polycrystallization by performing excimer laser annealing such as eC1.
- the polycrystalline silicon thin film 26 is buttered using a well-known photolithography and etching technique (silicon thin film forming step).
- a gate insulating film 27 made of a silicon oxide film having a thickness of about 120 nm is formed by using the ECR-CVD method. Then, a tantalum film having a thickness of about 600 to 800 nm is deposited on the entire surface by sputtering, and is patterned to form a gate electrode 19 (gate electrode forming step).
- a photoresist pattern 29 in which the region where the P ′ impurity diffusion region 32 is to be formed and the gate; and the region where the pole 19 is formed are formed.
- ion doping using / ⁇ ⁇ since the gate electrode 19 and the photo resist pattern 29 serve as a mask material and ions are implanted, ⁇ -type impurity diffusion is performed only in a portion adjacent to the channel region 30.
- a region 32 is formed (third region formation).
- the dose of the ion doping for example, 1 ⁇ 10 X 1 0 'r' atoms / cm degree.
- the dose S at the time of ion doping may be about 1 to 1 O xl O ′ :> atoms / cm J , but is smaller than the dose 3 ⁇ 4 of B, H ( ; H, in the ion doping step of FIG.
- both the P-type impurity and the N-type impurity are introduced into the region 32 between the channel region 30 and the source and drain regions 17 and 18, but the dose amount is set as described above. region 32 by setting remains at P-type. then, perform N 2 Aniru of 300 ° C, 2 hours.
- an interlayer insulating film 28 made of a silicon oxide film having a thickness of about 500 to 1,000 nm is formed by a CVD method.
- contact holes 20 and 20, which penetrate through the interlayer insulating film 28 and communicate with the source region 17 and the drain region 18 on the polycrystalline silicon film 26, are opened.
- a 1—Si—Cu film is deposited and patterned to form a source electrode. 21.
- a drain electrode 22 is formed.
- the manufacturing method for the N-channel TFT alone has been described above.
- the N-channel TFT is a thin-film transistor.
- the formation of the P-type impurity diffusion region 32 of (1) can be performed simultaneously with the formation of the source and drain regions of the P-channel TFT.
- FIGS. 7A to 7D the example will be described with reference to FIGS. 7A to 7D.
- a silicon oxide film having a film thickness of about 100 to 500 nm is formed on the entire surface of a glass substrate 24 by using a CVD method to form a base insulating film 25.
- a film is formed on the upper surface of the ground excavation 25 by the CVD method using disilane or monosilane as a raw material.)
- Amorphous silicon film of ⁇ 50 nm ⁇ is formed, and an excimer laser such as XeC1 is used. Polycrystallize by performing one annealing. Then, the polycrystalline silicon thin film is patterned using a well-known photolithography-etching technique to form a polycrystalline silicon thin film 26 (silicon film forming step).
- a gate made of a silicon oxide film having a film thickness of about 120 nm is formed on the surfaces of the polycrystalline silicon film 26 and the base insulating film 25 by using a £-( ⁇ 0 method). Insulation removal 27 is formed, and a tantalum film having a thickness of about 600 to 800 nm is formed on the entire surface by a sputtering method, and this is patterned to form a gate electrode 19 (gate).
- the same processing is performed on the N-channel TFT side and the P-channel TF ⁇ 3 ⁇ .
- ions are implanted using the gate electrode 19 as a mask, so that the source region 49 (first region) is sandwiched by the channel region 48 immediately below the gate electrode 19. Region) and a drain region 50 (second region) are formed.
- the P-type impurity diffusion region 32 of the N-channel TFT and the source / drain regions 49 and 50 of the P-channel TFT can be formed simultaneously.
- the dose at the time of ion doping is, for example, about 1 to 10 ⁇ 10 15 atoms / cm ”.
- a ⁇ photo resist pattern 29b is formed in all regions on the P-channel TFT side, and PH:, / H 2 is used for ion doping.
- ions are not implanted into the P-channel TFT side, and a source ⁇ region 17 and a drain region 18 which are N3 ⁇ 4 impurity diffusion regions are formed on the N-channel TFT side (first and second regions are formed).
- the dose at the time of ion doping may be about 1 to 10 ⁇ 10 1 atoms / cm, but is smaller than the dose of B Hc / H :; in the ion doping process of! 7 C.
- both the P impurity and the N-type impurity are introduced into the channel region 30 on the ⁇ -channel TFT side and the region 32 of the source and drain regions 17 and 18, but the dose S is set as described above.
- the area 32 remains P-type.
- the P impurity diffusion region 32 of the N-channel TFT and the source and drain regions 49 and 50 of the P-channel TFT are formed first, and the source and drain regions 17 and 18 of the N-channel TFT are formed later.
- the source and drain regions 17 and 18 of the N-channel TFT are formed first, and the P-type impurity diffusion region 32 of the N-channel TFT and the source and drain regions 49 and 50 of the P-channel TFT are formed later. (The order of FIG. 7C and FIG. 7D may be reversed.)
- the P-type impurity diffusion region 32 of the N-channel TFT and the source / drain region 49 of the P-channel TFT can be formed in one photolithography process and P-type ion implantation process. Since 50 can be formed at the same time, a thin film transistor having an impurity diffusion region for preventing characteristic deterioration can be manufactured without increasing the number of steps. Also in the thin-film transistor 31 of the present embodiment, the generated holes flow into the P-type impurity diffusion region 32, so that the amount of holes injected into the source region 21 is reduced. The same effect as in the first embodiment, in which the characteristic deterioration of the curve moving to the depletion side can be reduced, can be obtained.
- FIG. 8A and FIG. 8B which is a cross-sectional view taken along the line V 111—VIII, a ⁇ -type impurity diffusion region 71 having a shape that does not protrude from the channel region 30 to the source and drain regions 17 and 18 side.
- FIG. 9 which is the IX-IX line of 9 ⁇ and M l
- the- ⁇ in the channel direction of the channel region 30 is the ⁇ ! Impurity extended region 7 2.
- FIGS. 8 ⁇ to 19 ⁇ the same reference numerals are given to components 3 ⁇ 4 ⁇ that are common to FIGS. 1A and 1B and FIGS. 4A and 4B.
- the P-type impurity diffusion region is also formed on the source region side, but i holes are generated only in the vicinity of the drain region. Therefore, it is not always necessary to provide the P impurity diffusion region on the source region side, and it is sufficient to provide the P impurity diffusion region on the drain region without ⁇ .
- FIGS. 10A and 10B a third embodiment of the invention will be described with reference to FIGS. 10A and 10B.
- FIGS. 10A and 10B are views showing the transistor 34 of the present embodiment.
- the thin film transistors of the first and second embodiments have a P-type impurity diffusion region, FIG.
- the film transistor 34 of the present embodiment does not have a P-type impurity diffusion region, and has a devised planar shape of a source, a drain region, and a channel region.
- FIG. 10A is a plan view of the thin film transistor 34 of the present embodiment.
- the thin film transistor 34 has a source region 35 and a drain region 36, both of which are N-type impurity diffusion regions, and a gate electrode 37, and a channel immediately below the gate electrode 37 is a channel.
- the area is 38.
- the source and drain regions 35 and 36 are in contact with the opposite sides of the gate electrode 37, that is, the source and drain regions 39 and 40.
- the end on the connected side has a narrow width
- the gate electrode 37 side has a width of about 10 pm wide on one side, and the protrusions 35 a, 3 protruding outward (vertical direction in the figure) 6a (carrier injection area).
- the channel length L is 5 ⁇ m
- the width W 1 (minimum width) on the narrow side of the source / drain region is about 100 ⁇ m
- the width W 2 of the channel region is small. Is about 20 // m larger than the width W1.
- a source electrode 39 and a drain electrode 40 are connected to the source region, the region 35, and the drain region 36 through a plurality of contact holes 41, 41,.
- FIG. 10B is a cross-sectional view taken along line XX of FIG. 10A.
- a base insulating film 43 made of silicon oxide, a source / drain region 35, 36, and a polycrystalline silicon thin film 44 serving as a channel i region 38 are sequentially formed.
- a gate electrode 37 made of a tantalum film is formed on the L with a gate insulating film 45 interposed therebetween.
- an interlayer insulating film 46 made of a silicon oxide film is formed thereon, and contact holes 41 and 41 penetrating through the interlayer insulating film 46 and leading to the source region 35 and the drain region 36 are opened.
- a source electrode 39 and a drain electrode 40 are formed.
- the drift is the carrier flow moving by ⁇
- the diffusion is the carrier flow moving by ffi gradient.
- the flow of holes generated near the drain region 36 also depends on the component flowing toward the source region 35 by the drift and the diffusion.
- the source and drain electrodes 39, 40 generate pressure, and an electric field is generated.
- the regions that actually function as transistors are the source, drain regions 35, 36, and the channel region 38. Is an area of a narrow portion.
- the holes flowing into the overhang portions 35a and 36a do not affect the transistor characteristics, and as a result, are more effectively injected into the source region 35 than the conventional film transistor. Since the ratio of holes to be formed is reduced, the characteristic deterioration can be reduced.
- FIGS. 11A and 11B show a thin film transistor 51 of the present embodiment.
- the thin film transistor 51 of the present embodiment also has a P-type impurity diffusion region as in the third embodiment. It is a form in which a plurality of transistors with a small channel width are connected in parallel without having a channel.
- FIGS. 11A and 11B the same components as those in FIGS. 10A and 10B are denoted by the same reference numerals.
- FIG. 11A is a plan view of the thin film transistor 51 of the present embodiment.
- a plurality (four in the case of the present embodiment) of polycrystalline silicon ⁇ 52 is alternately connected to one gate electrode 3 ⁇ 437. It is formed as follows.
- the ⁇ ′ ,, ′, silicon 52 includes a gate ′, a channel region 38 below the electrode 37 ⁇ a source region 5 3, which is an impurity diffusion region.
- the first region) and the drain region 54 (3 ⁇ 42 region) are formed.
- contact holes 41 are formed in the source region 53 and the drain region 54 of each of the multiple silicon films 52, so that the source regions 53 and the drain regions 54 share a common source electrode 39, Each is connected to a drain electrode 40.
- the channel i ⁇ L is 5 ⁇ m
- the width W 1 of each channel region 38 is 10 8m
- the modulus W 2 on the side of is 70 ⁇ m. It is desirable that W1 is lOm or less and W2 is 50 ⁇ .m or more.
- FIG. 118 is a cross-sectional view taken along the line XI—XI of FIG. 11A.
- a base insulating film 43 composed of a silicon oxide film, a source / drain region 53, 54, and a polycrystalline silicon film 52 serving as a channel region 38 are formed.
- a gate electrode 37 made of a tantalum film is formed thereon with a gate insulating film 45 interposed therebetween.
- an interlayer insulating film 46 made of a silicon oxide film is formed thereon, and contact holes 41 and 41 penetrating through the interlayer insulating film 46 and leading to the source region 53 and the drain region 54 are opened.
- a drain electrode 40 is formed.
- TFT width the higher the temperature during excitation. This is because if the channel width is large, the heat generated near the center of the channel can only be dissipated in the vertical direction. This is because it is difficult to disperse in the ⁇ direction. Therefore, TFTs with larger channel widths have lower reliability. From this viewpoint, in the present embodiment, by connecting a plurality of transistors having a small width in parallel, heat during operation can be efficiently dissipated, and sufficient reliability can be ensured.
- the present embodiment is a liquid crystal display device using the open-ended transistor of the present invention
- FIG. 12 is a block diagram showing the configuration of the liquid crystal display.
- this display device E55 has a built-in driver circuit, and is equipped with a circuit driver I "! Road 56, a gate line driver circuit 57, and a pyramid matrix 5
- the source line driver circuit 56 is composed of a shift register 59, a video signal bus 60a, 60b, 60c, and an analog switch 61a, 61. b, 6 1 c, etc.
- the gate line driver circuit 57 has a shift register 62, a sofa 1 63, etc., and constitutes these driver circuits 56, 57.
- the structure of each transistor (not shown) is of the CM ⁇ S type, while the pixel matrix 58 is a matrix in which the pixels 64 are arranged in a matrix.
- liquid product cell 66 counter electrode 67.
- One-side element matrix from source line driver path 56 The source lines 68 a, 68 b, 68 c extend from the pixel transistors 65 of the pixel matrix 58 to the pixel transistors 65 of the pixel matrix 58 from the gate line driver circuit 57.
- gate lines 69a and 69b extend.
- the thin film transistor of the present invention is applied to each or a part of a circuit portion such as a source line driver circuit, a gate line driver circuit, an analog switch, and a pixel transistor.
- a circuit portion such as a source line driver circuit, a gate line driver circuit, an analog switch, and a pixel transistor.
- polysilicon TFT n-channel enhancement Type MOS FET
- Leakage current (off current) of Ml “ID” is a method in which the potential of the gate (G) is set to 0 V or less and a predetermined voltage is applied between the source (S) and the drain (D). In this case, it is defined as the current flowing when (drain potential> source potential, drain potential> 0).
- Figure 14 shows an example of the relationship between the gate-source voltage (VGS) and the drain-source current (IDS) of a polysilicon TF fabricated by a low-temperature process. It is clear that the leakage current (off-current) is quite large and the range of variation (Q) is wide.
- Figure 15 shows the energy band diagram of the N3 ⁇ 4 MO S FET in the ⁇ ⁇ state (gate biased).
- the energy band is tilted by the shadow f of the gate voltage.
- E i indicates the intrinsic level
- E V indicates the upper limit level of the iiffi'vt 'child band
- E c indicates the limit level of transmission.
- the “electric field” in polysilicon MOSFETs causes excitation through the localized states of electrons or a sharp bend in the band.
- the “electric field” has a significant effect on the TFT leakage current characteristics.
- the outer edge of the island A strong electric field is applied to the source and drain at the four edge portions (a) to (d) in contact with the source 132 and the drain 142 at the portion where the portion (peripheral portion) and the gate electrode 22 overlap each other. It has been found that this is the cause of the increase.
- the strong electric field at the four edge portions (a) to (d) is due to the step thickness between the substrate 930 and the island due to the thickness of the island. ? This is because the length of the island becomes longer, and the electric field tends to concentrate due to the sharp edge of the island.
- m 16 is a ⁇ view of the MO S FET according to the embodiment of the iff 6 of ⁇ II.
- the feature of this M ⁇ S FET is that an intrinsic and a sock (il) 110 are provided on the outer periphery of the polysilicon island.
- the outer thread (outer periphery) of the polysilicon island does not match the outside of the lease layer 130 and the drain layer 140, and the source f1 30 and the drain layer 140 are located inside the island. It is open.
- reference numeral 120 is a gate electrode layer
- reference numeral J 930 is an insulating plate.
- FIG. 17 is a cross-sectional view of the device along the line XVII-XVII of FIG. 16, and FIG. 18A is a cross-sectional view of the device along the line XVIII-XVIII of m16.
- reference 150 is a gate isolation (Si02 film).
- the thicknesses L 1 and L 2 of the gate insulating film are different due to the step caused by the island thickness.
- the electric field concentration tends to occur because the edge of the island is sharp and the electric field is strong.
- the intrinsic layer (i-layer) 110 reduces the electric field applied to the source layer 130. That is, as shown in FIG. 18B, when an electric field E is applied, a depletion layer extends in the intrinsic layer (i) layer 110 and absorbs the electric field. Therefore, the electric field applied to source layer 130 is reduced. As described above, the electric field affects the generation of the leakage current (off current). Therefore, the smaller the electric field, the smaller the leakage current (off current) and the more the variation is suppressed.
- FIG. 19 and 20 show the relationship between the drain-source current (IDS) and the gate-source voltage (VGS) of the polysilicon TFT (n-type MOSFET) produced by the low-temperature process, as measured by the present inventors. Indicates a value.
- FIG. 19 shows the case where the present invention is not applied
- FIG. 20 shows the case where the present invention is applied (in the case of the structure of FIG. 16). In both cases, the leak current amount was actually measured for 12 samples.
- VGS - when 1 0 V, the variation range of the IDS "10- 1 1 ⁇ : 1 0 ' ' (A) " is on the order of,
- the amount of leakage current (off current) can be reduced and its variation can be suppressed.
- the force of providing the intrinsic layer (i-layer) 110 so as to surround the polysilicon island In general, the gate; the part that overlaps with the pole 120, especially the (a), (b), (c), and (d) in FIG. What is necessary is just to be provided.
- an intrinsic layer (i-layer) is interposed for both the source (S) and the drain (D).
- FIG. 21 is a sectional view of the device according to the seventh embodiment of the present invention (XV in FIG. 16). III- XVIII line).
- a p-layer 160 and an intrinsic layer (i-layer) 162 connected to the p-layer are provided in the (a) and (b) sections where the electric field is strong, on the outer periphery of the polysilicon island. It is a thing.
- FIG. 22 is a view showing a cross-sectional structure (upper side) and a planar structure (Ff ! 'J) of a device according to an eighth embodiment of the present invention.
- the feature of the present embodiment is that an insulating film (Si02fl) 170 is provided outside the polysilicon island so as to have a diameter of ⁇ to increase the size of the non-woven film in the silicon part. This is to relax 3 ⁇ 4 ⁇ .
- the insulating film (SiO 2 film) 170 (thickness) L 3 a, L 3 b) and the gate insulating film 150 () (L 4 a, L 4 b) are present alternately. As a result, the electric field applied to ⁇ (source or drain) 130 is reduced.
- ['23] shows the metastructure of the device according to the ninth embodiment of Kizaki, and Fig. 23B shows an equivalent circuit thereof.
- a feature of the present invention is that the structure of FIG. 16 is applied to a dual-gate type MOS FET.
- the dual-gate type MOS FET has a configuration in which two MOS transistors Ml and M2 are connected in series.
- reference numeral 120 denotes a first gate
- reference numeral 22 denotes a second gate
- reference numeral 180 denotes a source layer.
- the reduction rate of the leakage current of one MO SFET (the amount of leakage current after application of the present invention / the amount of leakage current before application) is “F ( ⁇ 1)”
- the leakage of the entire two MOSFETs 'The current reduction rate is “F x F”
- the leakage current is further reduced compared to the case of a single MOS FET. Also, variations in leakage current are reduced.
- FIG. 24 shows ⁇ indicating the planar structure (upper side) and the sectional structure (depth) of the device according to the tenth embodiment of the present invention.
- I 16 is suitable for the so-called “offset MOSFET”.
- the offset ⁇ SF ⁇ is at least the drain to the gate electrode! It is a transistor that has a structure that has an offset (ie, offsets in a ffl pairwise positional relationship). In FIG. 24, an offset is provided not only for the drain 142 but also for the source ⁇ 132.
- the offset structure is effective in reducing the leakage current (off current) because the gate and drain do not vary significantly, but on the other hand, when the offset S is large, the on current decreases. Invite the 3 ⁇ 4 ⁇ of ⁇ ⁇ 3 ⁇ 4 ⁇ . Therefore, adjustment of the offset star is difficult.
- Step 1 As shown in FIG. 25, the amorphous silicon thin film (or polysilicon thin film) 200 deposited on the glass substrate 930 by the LPCVD method is irradiated with a laser by an excimer laser. By annealing, the polysilicon thin film is recrystallized.
- patterning is performed to form islands 210a and 210b.
- Step 3 As shown in FIG. 27, gate insulators 300a and 300b covering the islands 210a and 210b are formed.
- Gate electrodes 400a and 400b composed of Al, Cr, Ta, etc. are formed to be reduced to 128.
- Step 5 As shown in FIG. 29, mask layers 450a and 450b made of polyimide or the like are formed, and the gate electrode 400a and the mask layers 450a and 450b are used as masks. For example, do boron (B) ion people. Thereby, p i ⁇ 500 a, 500 b are formed. With this, intrinsic ⁇ 510a and 510b are automatically formed.
- Step 7 As shown in FIG. 31, an interlayer insulating film 700 is formed, and after selectively forming a contact hole, electrodes 810, 820, and 830 are formed.
- the source layer and the drain layer can be formed inside the outer edge of the polysilicon island by self-alignment using the gate electrode and the insulating layer as a mask.
- an intrinsic layer (i) layer can be automatically formed on the outer edge of the polysilicon land in the self-alignment.
- FIGS. 32 and 33 show an outline of a liquid crystal display device to which the first to eleventh embodiments according to the present invention are applied.
- the liquid crystal display device includes an active matrix unit (pixel unit) 101, a data line driver 110, and a scanning line driver 102.
- pixel unit 101 denotes a timing controller
- reference numeral 104 denotes a video signal amplifier circuit
- reference numeral 105 denotes a video signal generator.
- the TF ⁇ ⁇ ⁇ ⁇ in the active matrix unit (pixel unit) 101 and the TF ⁇ forming the data line drivers 110 and 2 ⁇ ⁇ are both shown in FIG.
- TF of the pixel section 100 not only the TF of the pixel section 100 but also the TFTs constituting the data line driver 110 and the scanning line driver 102 are provided on the active matrix substrate 940. They are formed by the same manufacturing process. In other words, a liquid crystal display device is configured by using a driver-mounted active matrix substrate 9400.
- the liquid crystal display -55 has a hack light 900, a polarizing plate 92, an active matrix% plate 940, a liquid crystal 950, a color filter substrate. (Opposite substrate) 960, polarizing plate 970.
- the leakage current (off-it flow) of TFT in the III element part is reduced, and the luminance fluctuation of the display screen is reduced. Further, variation in TFT leak current (off current) is suppressed, and therefore, the design of an active matrix substrate is also easy. Also, since a high-performance liquid crystal driver circuit configured using the TFT of the present invention is mounted, the performance is high.
- An electronic device configured using the liquid crystal display device includes a display information output source 1000, a display information processing circuit 1002, and a display drive circuit 1004 shown in FIG. ,
- a display panel such as a liquid crystal panel, a clock generation circuit and a power supply circuit.
- the information output source 1 ⁇ 0 0 is configured to include memories such as ROM and RAM, a tuning circuit for tuning and outputting TV signals, etc. Outputs display information such as video signals based on the clock from the clock generation circuit 1008.
- the display information processing circuit 1002 processes and outputs the communication information based on the clock from the clock generation circuit 1008.
- the display information processing circuit 1002 can include, for example, an amplification / polarity inversion circuit, a # :!
- the display drive circuit 1004 includes a scan side drive circuit and a data side drive circuit, and drives the liquid crystal panel 1006.
- the power supply circuit 110 supplies power to each of the circuits described above.
- the ⁇ -devices having such a configuration include a liquid crystal projector shown in FIG. 35, a personal computer (PC) and an engineering workstation (EWS) for multimedia shown in FIG. 36, a pager shown in FIG. Talk, word processor, television, viewfinder type ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ I can do it.
- PC personal computer
- EWS engineering workstation
- the liquid crystal projector shown in Fig. 35 is a projection ⁇ '-! Projector that uses a transmissive liquid crystal panel as a light valve. For example, it uses an optical system of a three-plate prism type. In FIG. 35, the projector 1100 is white.) The light emitted from the lamp source 1102 of the six sources is reflected inside the light guide 1104 by a plurality of mirrors 1106 and 2 sheets. Dye Croy's three primary colors R, G, and B are divided into three primary colors by 1 08, and three liquid product panels 1 1 1 0 R, 1 1 1 0 that show iiiij images of each color G and 1110 B.
- the light modulated by the liquid crystal panels 111 R, 110 G and 110 B is incident on the dichroic prism 1 112 from three directions.
- the dichroic prism 111 the light of red R and blue B is bent by 90 °, and the light of green G goes straight, so that the images of each color are synthesized, and the color is projected on the screen through the projection lens 1 114. The image is projected.
- the personal computer 1200 shown in FIG. 36 has a main body 1204 having a keyboard 1202, and a liquid crystal display screen 1206.
- the pager 1300 shown in FIG. 37 has a liquid crystal display Plate 1304, light guide 1306 with backlight 1306a, circuit board 1308, first and second shield plates 13 10 1 3 1 2 two elastic conductors 13 14 1 316, and film carrier tape 1 3 With eighteen.
- the two elastic conductors 13 14 13 16 and the film carrier tape 13 18 connect the liquid crystal display substrate 1304 and the circuit board 1308.
- the liquid crystal display panel 1304 is formed by enclosing liquid crystal in ⁇ 3 of two transparent substrates 1304a and 1304b, and this constitutes at least a dot matrix type liquid crystal display panel.
- the lul road which is not used for the liquid crystal board 1304 is an external circuit for the liquid product board, and can be mounted on the circuit board 1308 at J3 ⁇ 4 in FIG.
- a circuit board 1308 is required in addition to the liquid product display board 1304, but a liquid product display device is used as a component for the S slave device.
- a driving circuit or the like is mounted on the transparent liquid crystal m3 ⁇ 4k, the 1 ⁇ small unit of the liquid F; 3 ⁇ 4i is a liquid product plate 1304.
- the liquid crystal display substrate 1304 can be used as a liquid component, which is a component of the child device river, by setting the liquid crystal display substrate 1304 in the metal frame 1302 as a ft rest.
- a liquid crystal display panel 1304 and a light guide 1306 provided with a pack light 1306a are incorporated in a metal frame 1302 to obtain a liquid product.
- the display device can be configured. Instead, as shown in FIG. 24, one of two transparent substrates 1304a and 1304b constituting the liquid crystal display substrate 1304 is provided with an IC chip on a polyimide tape 1322 having a metal conductive film formed thereon.
- a TCP Transmission Carrier Package
- the present invention is not limited to the above embodiment.
- the present invention is not limited to being applied to the driving of the above-described various liquid crystal panels, but is also applicable to electroluminescence and plasma display devices.
- the present invention can be applied to a MOS FET having an LDD structure. Further, in the above-described first to fourth embodiments, the example of the N-channel TFT has been described. However, the problem of characteristic deterioration due to hot carriers is not so remarkable as that of the N-channel TFT. This is a possible problem. Therefore, the present invention can be applied to a P-channel TFT. In that case, an N-type impurity diffusion region may be formed instead of the P impurity diffusion region in the first and second embodiments. Further, the silicon film forming the channel No. 1 region and the north and drain regions is not limited to the multi-component silicon film, but may be an amorphous silicon film.
- the dimensions of the ⁇ -type impurity diffusion region and the number of ⁇ -type impurity diffusion regions in the embodiments of ⁇ 1 and fi 2, or the dimensions of the output in the projection configuration of 3 It is possible to adapt to the extraordinary numerical values such as the width of the ⁇ channel ⁇ region and the width of the t-type in the mode).
- the thin film transistor of the present invention is not limited to a balun transistor or an analog switch, and can be applied to a rare circuit component.
- the above-described ⁇ it is "J ability to apply force 5 which examples of Totsubuge one Bok thin film transistor, the present investigation to Bo Bok Muge Ichito type carrying film transistor.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/011,998 US6084248A (en) | 1996-06-28 | 1997-06-27 | Thin film transistor, manufacturing method thereof, and circuit and liquid crystal display device using the thin film transistor |
US10/677,257 US7195960B2 (en) | 1996-06-28 | 2003-10-03 | Thin film transistor, manufacturing method thereof, and circuit and liquid crystal display device using the thin film transistor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17046496 | 1996-06-28 | ||
JP8/170464 | 1996-06-28 | ||
JP21190496 | 1996-07-23 | ||
JP8/211904 | 1996-07-23 |
Related Child Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/011,998 A-371-Of-International US6084248A (en) | 1996-06-28 | 1997-06-27 | Thin film transistor, manufacturing method thereof, and circuit and liquid crystal display device using the thin film transistor |
US09011998 A-371-Of-International | 1997-06-27 | ||
US09/488,098 Division US6429120B1 (en) | 1996-06-28 | 2000-01-18 | Methods and apparatus for making integrated-circuit wiring from copper, silver, gold, and other metals |
US09/488,038 Division US6333520B1 (en) | 1996-06-28 | 2000-01-19 | Thin film transistor, manufacturing method thereof, and circuit and liquid crystal display device using the thin film transistor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998000870A1 true WO1998000870A1 (fr) | 1998-01-08 |
Family
ID=26493448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/002233 WO1998000870A1 (fr) | 1996-06-28 | 1997-06-27 | Transistor a couche mince, son procede de production et circuits et affichage a cristaux liquides utilisant le transistor a couche mince |
Country Status (5)
Country | Link |
---|---|
US (2) | US6084248A (ja) |
KR (2) | KR100374737B1 (ja) |
CN (3) | CN100502047C (ja) |
TW (1) | TW471180B (ja) |
WO (1) | WO1998000870A1 (ja) |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9262978B2 (en) | 1998-03-27 | 2016-02-16 | Semiconductor Energy Laboratory Co., Ltd. | Driving circuit of a semiconductor display device and the semiconductor display device |
KR20010056980A (ko) * | 1999-12-17 | 2001-07-04 | 이인환 | 폴리실리콘 박막트랜지스터의 불균일도 개선을 위한트랜스터 슬라이싱 |
US9795674B2 (en) | 2010-02-26 | 2017-10-24 | Novo Nordisk A/S | Stable antibody containing compositions |
US10709782B2 (en) | 2010-02-26 | 2020-07-14 | Novo Nordisk A/S | Stable antibody containing compositions |
US10835602B2 (en) | 2010-05-28 | 2020-11-17 | Novo Nordisk A/S | Stable multi-dose compositions comprising an antibody and a preservative |
Also Published As
Publication number | Publication date |
---|---|
CN100502047C (zh) | 2009-06-17 |
KR100392967B1 (ko) | 2003-07-31 |
CN1270389C (zh) | 2006-08-16 |
US6333520B1 (en) | 2001-12-25 |
KR19990044209A (ko) | 1999-06-25 |
CN1196832A (zh) | 1998-10-21 |
CN1444288A (zh) | 2003-09-24 |
CN1652353A (zh) | 2005-08-10 |
KR100374737B1 (ko) | 2003-07-16 |
TW471180B (en) | 2002-01-01 |
US6084248A (en) | 2000-07-04 |
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