WO1999030206A1 - Dispositif a cristaux liquides et procede de commande de ce dernier - Google Patents
Dispositif a cristaux liquides et procede de commande de ce dernier Download PDFInfo
- Publication number
- WO1999030206A1 WO1999030206A1 PCT/JP1998/005329 JP9805329W WO9930206A1 WO 1999030206 A1 WO1999030206 A1 WO 1999030206A1 JP 9805329 W JP9805329 W JP 9805329W WO 9930206 A1 WO9930206 A1 WO 9930206A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- liquid crystal
- voltage
- signal
- scanning
- data
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3622—Control of matrices with row and column drivers using a passive matrix
- G09G3/3629—Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Definitions
- the present invention relates to a liquid crystal device, and more particularly, to a configuration and a driving method for automatically determining an optimum drive voltage value and driving at the voltage value in a smectic liquid crystal device.
- liquid crystal panels have been actively researched and developed because they can achieve the same display quality as CRT even though they are small and light. Recently, it has been used not only as a monitor for a television computer, but also as a so-called spatial light modulator such as an optical shutter.
- a threshold voltage at which a state of liquid crystal molecules switches has temperature dependence.
- the LCD panel has a viewing angle dependency in which the display quality varies depending on the viewing angle. For this reason, conventional liquid crystal devices are provided with a device for adjusting the voltage applied to the liquid crystal so that optimum display is performed while the liquid crystal device is operating. The voltage was adjusted so that Disclosure of the invention
- the present invention provides a liquid crystal panel directly with human eyes.
- the drive voltage value required to make the display state of the liquid crystal panel the most optimal state that is, the state with the highest contrast
- the purpose of the present invention is to provide a liquid crystal display device having a configuration for automatically obtaining the following.
- the liquid crystal device according to the present invention is used for a display device or a spatial light modulation element that adjusts a light amount of a two-dimensional optical signal at a very high speed.
- the liquid crystal panel functions as a shutter for light, which converts an input two-dimensional optical signal into output light in a predetermined state.
- the liquid crystal device of the present invention is intended for a liquid crystal device using a smectic liquid crystal such as a ferroelectric liquid crystal or an antiferroelectric liquid crystal.
- the liquid crystal device of the present invention includes a liquid crystal panel having a smectic liquid crystal sandwiched between a pair of substrates, a display capturing device for capturing an image displayed on the liquid crystal panel, and a capturing device for storing captured image data.
- An input memory a reference memory for storing reference image data, a display difference circuit for comparing data stored in each of the input memory and the reference memory, and a voltage value applied to the liquid crystal panel.
- a voltage value variable circuit for varying the voltage, and optimal voltage setting means.
- the liquid crystal device of the present invention has a liquid crystal panel in which a smectic liquid crystal is sandwiched between a pair of substrates having a plurality of signal electrodes and scanning electrodes. Then, the signal voltage applied to the signal electrode and the scanning voltage applied to the scanning electrode are respectively changed, and the display capturing device captures the display of the liquid crystal panel at each combination of the signal voltage and the scanning voltage. .
- the captured image data is stored in a capture memory, and the captured image data is compared with the reference image data. Then, each combination of the signal voltage and the scanning voltage at which the two data match, The signal voltage and the scanning voltage are plotted on the coordinates of the X axis and the Y axis, respectively.
- the signal voltage value and the scanning voltage value corresponding to the coordinates of the center of gravity of the area drawn by the plotted points are respectively set as the optimum driving voltage values.
- the optimum driving voltage can be set even when the display state of the liquid crystal panel cannot be directly observed visually.
- the optimum drive voltage obtained by this method even when the threshold voltage of the liquid crystal slightly changes due to a change in temperature or the like, an optimum display can be performed without adjusting the drive voltage.
- FIG. 1 is a diagram showing a stable state of liquid crystal molecules in a ferroelectric liquid crystal.
- FIG. 2 is a configuration diagram of a ferroelectric liquid crystal cell and a polarizing plate.
- FIG. 3 is a diagram showing a change in light transmittance with respect to an applied voltage of a ferroelectric liquid crystal element.
- FIG. 4 is a configuration diagram of an antiferroelectric liquid crystal cell and a polarizing plate.
- FIG. 5 is a diagram showing a change in light transmittance with respect to an applied voltage of the antiferroelectric liquid crystal element.
- FIG. 6 is a configuration diagram of the liquid crystal panel used in the present invention.
- FIG. 7 is a diagram showing an example of the electrode configuration of the liquid crystal panel used in the present invention.
- FIG. 8 is a block diagram of the liquid crystal device of the present invention in which the optimum driving voltage setting circuit is incorporated.
- FIG. 9 is a diagram showing a sample display used in the present invention.
- FIG. 10 is a diagram showing a region of a voltage value at which the liquid crystal panel used in the present invention can be driven.
- FIG. 11 is a diagram showing regions of voltage values that can be driven at 35 ° C. and 45 ° C. of the liquid crystal panel used in the present invention.
- FIG. 12 is a block diagram of another embodiment of the liquid crystal device of the present invention in which the optimum drive voltage setting circuit is incorporated. Detailed description of the invention
- FIG. 1 is a diagram showing a stable state of a ferroelectric liquid crystal.
- the ferroelectric liquid crystal has two stable states as shown in Fig. 1, and switches to the first or second stable state depending on the polarity of the applied voltage.
- FIG. 2 is a diagram showing the arrangement of polarizing plates when a ferroelectric liquid crystal is used as a liquid crystal element.
- the polarizers 1a and 1b in accordance with the crossed Nicols, either the polarization axis a of the polarizer 1a or the polarization axis b of the polarizer 1b, and the first stable state of the liquid crystal molecules.
- the liquid crystal cell 2 In the second stable state, the liquid crystal cell 2 is placed so that one of the long axes of the molecules is almost parallel to the other.
- the change in transmittance with respect to the voltage is plotted and graphed to draw a loop as shown in Figure 3.
- V 1 the voltage value at which the change in the light transmittance saturates
- V 2 the voltage value at which the change in the light transmittance saturates
- V 4 a voltage of the opposite polarity is applied to decrease the light transmittance.
- V 4 The voltage value at which the light transmittance starts to V 3.
- the first stable state is obtained when the applied voltage value is equal to or higher than the threshold value of the ferroelectric liquid crystal molecules.
- the second stable state is selected.
- a black state (non-transmission state) can be obtained in the first stable state
- a white state (transmission state) can be obtained in the second stable state.
- FIG. 4 is a diagram showing the arrangement of a polarizing plate when an antiferroelectric liquid crystal is used as a liquid crystal element.
- the polarizing plates 1a and 1b adjusted to the cross Nicol, either the polarizing axis a of the polarizing plate 1a or the polarizing axis b of the polarizing plate 1b, and the long axis of the average molecule when no voltage is applied Place the liquid crystal cell 2 so that the direction X is almost parallel. Then, the liquid crystal cell is set so as to be in a black state when no voltage is applied and in a white state when a voltage is applied.
- the change in transmittance with respect to the voltage is plotted and graphed to draw a loop as shown in FIG.
- the voltage value at which the light transmittance starts to change is V 1
- the voltage value at which the change in light transmittance saturates is V 2
- the light transmittance decreases when the voltage value is reduced The voltage value at which the light transmittance starts to change is V3, and the voltage value at which the light transmittance starts to change when the absolute value is increased is V3, and the voltage value at which the light transmittance change saturates is V3.
- V 4 is the voltage value at which the light transmittance starts to change when the absolute value of the voltage is reduced.
- the first ferroelectric state is selected when the applied voltage value is equal to or higher than the threshold value of the antiferroelectric liquid crystal molecules.
- the second ferroelectric state is selected. These ferroelectric In this state, if the voltage value drops below a certain threshold, the antiferroelectric state is selected.
- the liquid crystal panel used in the present invention shown in FIG. 6 is composed of a pair of glass substrates 23a and 23b having a ferroelectric or antiferroelectric liquid crystal layer 22 having a thickness of about 1.7 mm. ing. Electrodes 24a and 24b are formed on the opposite surface of the glass substrate, and inorganic alignment films 25a and 25b are deposited thereon. Further, a polarizing plate 21a is provided outside one of the glass substrates, and a polarizing plate 21b is provided outside the other glass substrate so as to differ from the polarizing axis of the polarizing plate 21a by 90 °. Have been.
- the liquid crystal device used in the present invention When the liquid crystal device used in the present invention is installed in a light control device, the display state of the liquid crystal panel cannot be visually observed from the outside. Therefore, the liquid crystal device according to the present invention incorporates a device for automatically setting an optimal drive voltage value so that the display state of the liquid crystal panel is optimized.
- the display here means both the display of an image when the liquid crystal is used as a display device and the amount of transmitted light when the liquid crystal is used for a shutter or the like.
- Figure 7 shows an example of the electrode configuration of a liquid crystal panel when performing matrix driving.
- voltage waveforms are applied to the scanning electrodes (Y1 to Yn) and the signal electrodes (XI to ⁇ ).
- the state of the liquid crystal depends on the voltage value of the voltage waveform applied to each electrode.
- FIG. 8 is a block diagram of the liquid crystal device of the present invention in which the optimum drive voltage setting circuit is incorporated.
- the liquid crystal panel 15 is provided with a signal electrode 16 and a scanning electrode 17. Then, a drive voltage waveform is applied to these electrodes from the voltage value variable circuit 18, and a display according to the drive voltage waveform is performed on the liquid crystal panel.
- the display capturing device 20 has a CCD element 13 and a lens 14 and captures an optimum display image (described later) of the liquid crystal panel and stores it in a reference memory.
- the display capture device 20 also supports the LCD panel.
- a sample display (described later) is captured and stored in the capture memory 11.
- the display difference circuit 12 determines whether or not the data in the reference memory 10 and the data in the capture memory 11 match. According to the result, the CPU 19 for setting the optimum voltage sets the voltage variable circuit 18 Control o
- FIG. 9 is a diagram showing a sample display 21 in which white and black patterns are alternately arranged.
- the same pattern as the sample display 21 is displayed.
- the voltage applied to the signal electrode 16 and the scanning electrode 17 of the liquid crystal panel 15 is adjusted while visually observing, and an image of an optimal display (hereinafter, referred to as a “reference image”) is obtained.
- this image is captured by the display capture device 20, and the captured reference image data is stored in the reference memory 10 and o
- the operation of automatically obtaining the optimum drive voltage value after the liquid crystal panel is incorporated in the light control device will be described.
- the same pattern as the sample display 21 in Fig. 9 is displayed.
- the displayed image is captured by the display capturing device 20, and the captured image is stored in the capturing memory 11.
- the display difference circuit 12 determines whether or not the reference data of the image of the optimal display stored in the reference memory 10 matches the image data stored in the capture memory 11. I do.
- the signal voltage and the scanning voltage are set to 1 V respectively.
- the display on the liquid crystal panel 15 at that time is captured by the display capture device 20 and the captured image data is stored in the capture memory 11.
- the display difference circuit 12 determines whether the reference image data stored in the reference memory 10 and the image data of the liquid crystal panel stored in the capture memory 11 match. Then, when the two data coincide with each other, a plot is made at a point where the line of the signal voltage IV on the horizontal axis and the line of the scanning voltage 1 V on the vertical axis of the graph shown in FIG. 10 intersect.
- the signal voltage is held at IV, and the scanning voltage is increased to 1.5 V.
- the display on the liquid crystal panel 15 at that time is captured by the display capture device 20 and the captured image data is stored in the capture memory 11.
- the display difference circuit 12 determines whether or not the reference image data stored in the reference memory 10 matches the image data of the liquid crystal panel stored in the capture memory 11. Then, when the two data match, a plot is made at the point where the line of the signal voltage 1 V on the horizontal axis and the line of the scan voltage 1.5 V on the vertical axis of the graph shown in Fig. 10 intersect. If the two data do not match, they will not be plotted.
- the above operation is performed at 0.5 V intervals until the scanning voltage reaches 20 V.
- the signal voltage is set to 1.5 V, the scanning voltage is increased from I V at 0.5 V intervals, and the same operation as above is performed.
- the signal voltage and the scanning voltage start from a value of 1 V and increase at 0.5 V intervals. However, these values may be changed as appropriate.
- FIG. 10 shows a result obtained by performing the above operation and plotting a point where the scanning voltage and the signal voltage cross when the two data coincide with each other.
- the plotted area is a triangle (hereinafter, this triangular area is referred to as a “drivable area”).
- the position of the center of gravity of the “drivable region” is obtained, and the signal voltage and the scanning voltage corresponding to the position of the center of gravity are used as the “optimal drive voltage value”.
- the signal voltage corresponding to the position of the center of gravity and the scanning-side voltage as the optimum driving voltage value, even if the scanning voltage or the signal voltage slightly fluctuates, Optimal driving can be performed without departing from the triangular area.
- the drive voltage can be used as a drive voltage capable of performing optimal display.
- the control of the operation for obtaining the optimum drive voltage value is performed by the optimum voltage setting CPU 19 in FIG.
- the drivable areas are calculated at the lowest and highest temperatures, and the center of gravity of the triangular area where both drivable areas overlap is calculated.
- the voltage values on the signal side and the scanning side corresponding to the position of the center of gravity are used as the optimum driving voltage values.
- Figure 11 shows the triangular area obtained as described above.
- the triangular area (A) determines the triangular area (A) by the same method as above.
- the triangular area (B) is obtained by the same method as described above. Then, the center of gravity of the triangular area (C) where the triangular areas (A) and (B) overlap is determined, and the signal voltage and the scanning voltage corresponding to the position of the center of gravity are used as “optimal driving voltage values”.
- a stable display can be performed without correcting the drive voltage value for a temperature change from 35 ° C to 45 ° C. be able to.
- image data is directly captured by the display capturing device 20 including the CCD element 13 and the lens 14.
- a lens 74 for condensing the transmitted light amount and a transmitted light amount measurement device 73 can be composed of a photo diode and an amplifier. In this configuration, the amount of transmitted light from the entire liquid crystal panel on which the image is projected is captured.
- the transmitted light amount measuring device 73 captures the transmitted light amount of the reference image
- the light amount data is stored in the reference memory 10.
- the transmitted light amount measuring device 73 also captures the transmitted light amount of the sample display on the liquid crystal panel and stores it in the capture memory 11.
- the display difference circuit 12 determines whether the data in the reference memory 10 and the data in the capture memory 11 match or not. It controls the voltage value variable circuit 18.
- a liquid crystal device using a passive matrix has been described as an example.
- the present invention can be applied to a liquid crystal device using an active matrix.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98955945A EP0959380B1 (en) | 1997-12-05 | 1998-11-26 | Liquid crystal device and method for driving the same |
DE69840848T DE69840848D1 (de) | 1997-12-05 | 1998-11-26 | Flüssigkristallvorrichtung und Verfahren zur Ansteuerung derselben |
JP53057399A JP3830170B2 (ja) | 1997-12-05 | 1998-11-26 | 液晶装置の製造方法 |
US09/355,036 US6496176B1 (en) | 1997-12-05 | 1998-11-26 | Liquid crystal device and method for driving the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33471997 | 1997-12-05 | ||
JP9/334719 | 1997-12-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999030206A1 true WO1999030206A1 (fr) | 1999-06-17 |
Family
ID=18280459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/005329 WO1999030206A1 (fr) | 1997-12-05 | 1998-11-26 | Dispositif a cristaux liquides et procede de commande de ce dernier |
Country Status (5)
Country | Link |
---|---|
US (1) | US6496176B1 (ja) |
EP (1) | EP0959380B1 (ja) |
JP (1) | JP3830170B2 (ja) |
DE (1) | DE69840848D1 (ja) |
WO (1) | WO1999030206A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6943919B1 (en) * | 2000-06-29 | 2005-09-13 | Eastman Kodak Company | Method and apparatus for correcting defects in a spatial light modulator based printing system |
US7088331B2 (en) * | 2000-11-30 | 2006-08-08 | Thomson Licensing | Method and apparatus for controlling common mode electrode voltage in LCOS/LCD |
US20050128304A1 (en) * | 2002-02-06 | 2005-06-16 | Manasseh Frederick M. | System and method for traveler interactions management |
US7113880B1 (en) * | 2004-02-04 | 2006-09-26 | American Megatrends, Inc. | Video testing via pixel comparison to known image |
JP4428102B2 (ja) * | 2004-03-22 | 2010-03-10 | 富士ゼロックス株式会社 | 情報処理装置 |
US20060038884A1 (en) * | 2004-08-17 | 2006-02-23 | Joe Ma | Driving monitor device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH055879A (ja) * | 1991-06-27 | 1993-01-14 | Seikosha Co Ltd | 強誘電性液晶装置の製造方法 |
US5206633A (en) | 1991-08-19 | 1993-04-27 | International Business Machines Corp. | Self calibrating brightness controls for digitally operated liquid crystal display system |
JPH05289043A (ja) * | 1992-04-06 | 1993-11-05 | Chinon Ind Inc | 位相変調量制御装置 |
JPH05297350A (ja) * | 1992-04-15 | 1993-11-12 | Idemitsu Kosan Co Ltd | 液晶光学素子用温度補償装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4045791A (en) * | 1972-04-06 | 1977-08-30 | Matsushita Electric Industrial Co., Ltd. | Apparatus for driving liquid crystal display device wherein the signal applied thereto is varied in accordance with the temperature of the device |
US4751509A (en) * | 1985-06-04 | 1988-06-14 | Nec Corporation | Light valve for use in a color display unit with a diffraction grating assembly included in the valve |
US4888599A (en) * | 1987-10-23 | 1989-12-19 | Rockwell International Corp. | Real time apparatus for adjusting contrast ratio of liquid crystal displays |
GB2237400B (en) * | 1989-10-27 | 1994-04-20 | Eev Ltd | Control of liquid crystal display visual properties |
JPH04367189A (ja) * | 1991-06-13 | 1992-12-18 | Pioneer Electron Corp | ホワイトバランス調整装置 |
DE4410603C1 (de) * | 1994-03-26 | 1995-06-14 | Jenoptik Technologie Gmbh | Verfahren zur Erkennung von Fehlern bei der Inspektion von strukturierten Oberflächen |
US5625373A (en) * | 1994-07-14 | 1997-04-29 | Honeywell Inc. | Flat panel convergence circuit |
DE69631278T2 (de) | 1995-10-23 | 2004-11-18 | Interuniversitair Micro-Electronica Centrum Vzw | Entwurfssystem und -verfahren zum kombinierten Entwurf von Hardware und Software |
US5786801A (en) * | 1996-09-06 | 1998-07-28 | Sony Corporation | Back light control apparatus and method for a flat display system |
-
1998
- 1998-11-26 JP JP53057399A patent/JP3830170B2/ja not_active Expired - Fee Related
- 1998-11-26 EP EP98955945A patent/EP0959380B1/en not_active Expired - Lifetime
- 1998-11-26 DE DE69840848T patent/DE69840848D1/de not_active Expired - Fee Related
- 1998-11-26 WO PCT/JP1998/005329 patent/WO1999030206A1/ja active Application Filing
- 1998-11-26 US US09/355,036 patent/US6496176B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH055879A (ja) * | 1991-06-27 | 1993-01-14 | Seikosha Co Ltd | 強誘電性液晶装置の製造方法 |
US5206633A (en) | 1991-08-19 | 1993-04-27 | International Business Machines Corp. | Self calibrating brightness controls for digitally operated liquid crystal display system |
JPH05289043A (ja) * | 1992-04-06 | 1993-11-05 | Chinon Ind Inc | 位相変調量制御装置 |
JPH05297350A (ja) * | 1992-04-15 | 1993-11-12 | Idemitsu Kosan Co Ltd | 液晶光学素子用温度補償装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0959380A4 |
Also Published As
Publication number | Publication date |
---|---|
EP0959380A4 (en) | 2005-08-31 |
EP0959380A1 (en) | 1999-11-24 |
DE69840848D1 (de) | 2009-07-09 |
EP0959380B1 (en) | 2009-05-27 |
JP3830170B2 (ja) | 2006-10-04 |
US6496176B1 (en) | 2002-12-17 |
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