CN100395645C - Black-white cholesterol liquid crystal display and its producing method - Google Patents

Black-white cholesterol liquid crystal display and its producing method Download PDF

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Publication number
CN100395645C
CN100395645C CNB2004100778620A CN200410077862A CN100395645C CN 100395645 C CN100395645 C CN 100395645C CN B2004100778620 A CNB2004100778620 A CN B2004100778620A CN 200410077862 A CN200410077862 A CN 200410077862A CN 100395645 C CN100395645 C CN 100395645C
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liquid crystal
cholesterol liquid
black
crystal display
white
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CN1749836A (en
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沙益安
廖奇璋
王兴龙
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Iris Optronics Co Ltd
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Industrial Technology Research Institute ITRI
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Abstract

The present invention relates to a black and white cholesterol liquid crystal display and a manufacturing method thereof. The present invention utilizes exposure technique to complete the fabrication technology of light polymerization / phase separation, and further, a macromolecule wall and macromolecules diffused in a cholesterol liquid crystal display area are formed to save the time of the fabrication technology, to improve the mechanical strength of the gaps of display units and to strengthen the brightness and the contrast of the black and white display of the black and white cholesterol liquid crystal display.

Description

Black-white cholesterol liquid crystal display and manufacture method thereof
Technical field
The present invention relates to a kind of black-white cholesterol liquid crystal display and manufacture method thereof, particularly a kind ofly be display medium with the cholesterol liquid crystal and use a kind of exposure technique to finish the monochrome liquid crystal display and the manufacture method thereof of the photopolymerization/manufacturing process that is separated.
Background technology
In recent years, just flourish such as flexible displays such as Electronic Paper and e-book, its display medium that generally uses comprise that common LCD (liquid crystal display), electrophoretic display device (EPD) (electrophoresis display), electrochromic display device (ECD) (electrochromism display) and electrolysis separate out display (electrolysis display) etc.On Application of Electronic Paper, cholesterol liquid crystal and other display medium are compared, it all has preferable result on brightness and contrast, and have can passive driving and advantage such as production easily.
At United States Patent (USP) the 5th, 847, the application of cholesterol liquid crystal (cholesteric liquid crystal) on display disclosed among No. 798 the Polymer Stabilized Black-White CholestericReflective Display.Shown in Figure 1A and Figure 1B, it is respectively a kind of white state (planar state) and black state (focal comic state) synoptic diagram of common cholesterin liquid-crystal display.This cholesterin liquid-crystal display has bistable characteristic that is white state and black state when zero electric field.In Figure 1A and Figure 1B, cholesterin liquid-crystal display 10 comprises substrate 11, is coated with one deck ITO (tin indium oxide) or fellow on it respectively to form transparency electrode 12.Fill up cholesterol liquid crystal 13 in this cholesterin liquid-crystal display 10, wherein distributing has the macromolecule 14 of a strip bond.Side at substrate 11 forms an absorption layer 15, is generally black.In addition, between the two ends of transparency electrode 12, connect an AC power 16, so that this cholesterin liquid-crystal display 10 is switched between white state and the black state.
In Figure 1A, when additional power source 16 provides a voltage to this display unit and make cholesterol liquid crystal 13 transitions, and when being in the planar state, spiral helicine crystalline axis direction is approximately perpendicular to the surface of LCD unit, and forms the arrangement mode of multizone (multi-domain).So when ambient light incident (as shown in arrow 17), it reflects multiwave visible light (as shown in arrow 18), and will reflect the surface of LCD unit.The visible light of this reflection can pass through to change the arrangement mode of multizone and the adjustment of reflection wavelength, and shows white light.In Fig. 2 B, when additional power source 16 provides another voltage to this display unit and make cholesterol liquid crystal 13 transitions, and when being in focal conic state, spiral helicine crystalline axis direction presents chaotic the arrangement, therefore, when ambient light incident, light can be scattered to different directions, in addition, also can utilize absorption layer 15, collocation black absorption material is to produce black display.
Yet, when the shortcoming of foregoing invention is to make the macromolecule of a strip bond, adopts and do not use mask and with the UV-irradiation than weak intensity, required manufacturing process time reaches 1.5 hours.
In addition, in the application of flexible display, come the method in the gap of steady display device unit (cell) to become a kind of method of widely using with polymeric wall (polymer wall).It mixes monomer (monomer) with phase separation method with display medium, utilize that polyphosphazene polymer is legal to be isolated monomer in display medium again, and aggregates into polymeric wall, and it is as United States Patent (USP) the 5th, 473, disclosed person in No. 450.Gap for steady display device unit (cell), also have in the mode of micro-capsule (micro-encapsulating) and implemented, it utilizes the macromolecule of all utilizations such as photoresistance and display medium to utilize the high molecular polymerization method to make micro-capsule (micro-capsule) earlier, micro-capsule is inserted in the display unit again, and then form display module, it is as United States Patent (USP) the 6th, 120, No. 701 and the 6th, 203, disclosed person in No. 723.
Therefore, the present invention proposes a kind of black-white cholesterol liquid crystal display and manufacture method thereof, its with cholesterol liquid crystal as display medium and utilize a kind of exposure technique photopolymerization/manufacturing process is separated to finish, be spread in macromolecule and polymeric wall in the display with formation, with save manufacturing process time, strengthen display unit the gap physical strength and increase the contrast and the brightness of the display of white and black displays.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of black-white cholesterol liquid crystal display and manufacture method thereof, to save manufacturing process time.
Another object of the present invention is to provide a kind of black-white cholesterol liquid crystal display and manufacture method thereof, with the physical strength in the gap of strengthening display unit.
Another purpose of the present invention is to provide a kind of black-white cholesterol liquid crystal display and manufacture method thereof, to strengthen the contrast and the brightness of white and black displays.
For reaching above-mentioned purpose, the invention provides a kind of black-white cholesterol liquid crystal display, comprising: substrate is formed at the both sides of this black-white cholesterol liquid crystal display; Transparency electrode is formed at the inner surface of this substrate respectively; Both alignment layers is formed at the inner surface of this transparency electrode respectively; And a display layer, being formed at the inboard of this both alignment layers, this display layer comprises the macromolecule and the polymeric wall of cholesterol liquid crystal, diffusion, wherein, the fractionated polymer of described cholesterol liquid crystal and described diffusion is distributed in the formed zone of described polymeric wall.
The present invention further provides a kind of manufacture method of black-white cholesterol liquid crystal display, may further comprise the steps: substrate is provided, is formed at the both sides of this black-white cholesterol liquid crystal display; Transparency electrode is provided, is formed at the inner surface of this substrate respectively; Both alignment layers is provided, is formed at the inner surface of this transparency electrode respectively; And a display layer is provided, and being formed at the inboard of this both alignment layers, this display layer comprises the potpourri of cholesterol liquid crystal and high polymer monomer; And, in this display layer, form the macromolecule and the polymeric wall of cholesterol liquid crystal, diffusion with the uv photopolymerization method, wherein, the fractionated polymer of described cholesterol liquid crystal and described diffusion is distributed in the formed zone of described polymeric wall.
Utilize the photopolymerization/manufacturing process that is separated to form the macromolecule and the polymeric wall of diffusion, with save manufacturing process time, strengthen display unit (display cell) the gap physical strength and strengthen the contrast and the brightness of white and black displays
Description of drawings
Figure 1A is the white view of common cholesterin liquid-crystal display;
Figure 1B is the black view of common cholesterin liquid-crystal display;
Fig. 2 is the synoptic diagram of the black-white cholesterol liquid crystal display of preferred embodiment of the present invention;
Fig. 3 is the manufacture method synoptic diagram of the black-white cholesterol liquid crystal display of preferred embodiment of the present invention;
Fig. 4 is the top view of the black-white cholesterol liquid crystal display of preferred embodiment of the present invention.
Description of reference numerals:
10-cholesterin liquid-crystal display 11-substrate
12-transparency electrode 13-cholesterol liquid crystal
The 14-macromolecule 15-absorption layer that is separated
20-black-white cholesterol liquid crystal display 21-substrate
22-transparency electrode 23-joins layer mutually
The potpourri of 240-cholesterol liquid crystal and high polymer monomer
The macromolecule of 24-cholesterol liquid crystal 25-diffusion
26-polymeric wall 30-mask
35-pattern 50-ultraviolet source
Embodiment
For making feature of the present invention, purpose and function are had further cognitive and understanding, conjunction with figs. is described in detail as follows:
See also Fig. 2, it is the synoptic diagram of the black-white cholesterol liquid crystal display of preferred embodiment of the present invention.In Fig. 2, black-white cholesterol liquid crystal display 20 comprises substrate 21, and its inner surface is coated with layer of transparent electrode 22 respectively, and the inner surface of this transparency electrode 22 forms one deck both alignment layers 23 more respectively.Fill up cholesterol liquid crystal 24 in this both alignment layers 23, wherein distributing has the macromolecule 25 of the diffusion of propping up the strip bond.By above embodiment, the macromolecule 25 of diffusion can be upset the arrangement of cholesterol liquid crystal 24, allows planar state originally become the planar state of multizone, can produce white and show and the raising display effect.Intensity for the gap of strengthening display unit (cell) is improved with the polymeric wall in this display layer (polymerwall) 26.
In this specific embodiment, the material of this substrate can be glass substrate or plastic base.This transparency electrode can be used inorganic transparent conductive material or organic conductive macromolecule.This both alignment layers is used polyvinyl alcohol (PVA), pi, polyamide, polyureas, nylon, silicon dioxide, lecithin and/or little groove structure of arranging in pairs or groups.
The manufacture method of the black-white cholesterol liquid crystal display of preferred embodiment of the present invention as shown in Figure 3.Its key step is to be provided in the substrate 21 of these black-white cholesterol liquid crystal display 20 both sides; Then, on the inner surface of substrate 21, form transparency electrode 22 respectively; On the inner surface of transparency electrode 22, form both alignment layers 23 respectively; In the inboard of this both alignment layers 23, a display layer is provided, wherein filled up the potpourri 240 of cholesterol liquid crystal and high polymer monomer; With the uv photopolymerization method, in this display layer, form the macromolecule 25 and the polymeric wall 26 of diffusion.
In detail, the enforcement of this uv photopolymerization method is finished with ultraviolet source 50 these display layers of irradiation.At first, a mask 30 is placed between ultraviolet source 50 and this black-white cholesterol liquid crystal display 20, expose.Because mask 30 is provided with pattern 35, makes to have photic zone and light tight district simultaneously on the mask.In the present embodiment, after the cholesterol liquid crystal in the display layer of mask photic zone below and the potpourri 240 of high polymer monomer are subjected to ultraviolet photoetching, high polymer monomer can form polymeric wall 26 to the photic zone polymerization, and the free radical of diffusion forms the macromolecule 25 of diffusion with remaining in the monomer polymerization in light tight district; Simultaneously, cholesterol liquid crystal 24 also can be to the diffusion of light tight district.
Because after the exposure of above-mentioned use mask, may have remaining high polymer monomer, therefore can impose once exposure for the second time again, it is implemented with direct Exposure mode, can make the further polymerization again of remaining high polymer monomer, with the intensity and the white and black displays effect of promoting multizone planar in the gap of strengthening display unit (cell).
In sum, with the formed black-white cholesterol liquid crystal display 20 of manufacture method of the present invention except the advantage of the intensity in gap and high-contrast and high brightness with reinforcement display unit (cell), because the macromolecule 25 of polymeric wall 26 and diffusion forms simultaneously, therefore only need about 10 minutes manufacturing process time.
In Fig. 3, the exposure program that carries out ultraviolet source by the use of mask is that a kind of photopolymerization/manufacturing process is separated.Because the potpourri 240 of cholesterol liquid crystal and high polymer monomer before the exposure is after exposure, high polymer monomer can be in the photic zone polymerization and cholesterol liquid crystal 24 can spread to light tight district, and causes the result who is separated.
In order more to clearly demonstrate, Fig. 4 is the top view after the black-white cholesterol liquid crystal display of preferred embodiment of the present invention passes through the photopolymerization manufacturing process.Yet the mask pattern shown in this Fig. 4 is the purpose of example as an illustration only, but not as the restriction of the scope of the invention.Those skilled in the art when can the different pattern conversion it, do not repeat them here.
In the manufacturing process of LCD, tend to cause the phenomenon of colour cast, and in the present invention, more propose a kind of method that solves this defective.Because the generation of white light is by red (R), green (G), three primary colors are in harmonious proportion forms with blue (B), so when color offset phenomenon takes place, can be improved with decoration method.For instance, when white is red partially, cholesterol liquid crystal can be dyed inclined to one side blueness and be adjusted; When white is blue partially, cholesterol liquid crystal can be dyed inclined to one side redness and be adjusted; When white is green partially, cholesterol liquid crystal can be dyed inclined to one side redness and be adjusted.
Comprehensively above-mentioned, the present invention proposes a kind of black-white cholesterol liquid crystal display and manufacture method thereof, it utilizes the photopolymerization/manufacturing process that is separated to form polymeric wall and the macromolecule that is spread in the cholesterol liquid crystal viewing area simultaneously, with save manufacturing process time, strengthen display unit the gap physical strength and increase the light reflectivity of the white state of cholesterol liquid crystal and reduce the light reflectivity of the black state of cholesterol liquid crystal, to improve the contrast and the brightness of white and black displays.
The above only is preferred embodiment of the present invention, can not limit the scope of the invention.All equivalences of making according to claim of the present invention change and revise, and will not lose main idea of the present invention place, also do not break away from the spirit and scope of the present invention, and the former capital should be considered as further enforcement situation of the present invention.

Claims (17)

1. a black-white cholesterol liquid crystal display is characterized in that, comprising:
Substrate is formed at the both sides of this black-white cholesterol liquid crystal display;
Transparency electrode is formed at the inner surface of this substrate respectively;
Both alignment layers is formed at the inner surface of this transparency electrode respectively; And
One display layer is formed at the inboard of this both alignment layers, and this display layer comprises the macromolecule and the polymeric wall of cholesterol liquid crystal, diffusion, and wherein, the fractionated polymer of described cholesterol liquid crystal and described diffusion is distributed in the formed zone of described polymeric wall.
2. black-white cholesterol liquid crystal display as claimed in claim 1 is characterized in that, this substrate is one of glass substrate, plastic base, metal substrate and flexible base plate.
3. black-white cholesterol liquid crystal display as claimed in claim 1 is characterized in that, this transparency electrode is used one of inorganic conductive material and organic conductive material.
4. black-white cholesterol liquid crystal display as claimed in claim 1 is characterized in that, this both alignment layers is used one of polyvinyl alcohol (PVA), pi, polyamide, polyureas, nylon, silicon dioxide, little groove structure and lecithin.
5. black-white cholesterol liquid crystal display as claimed in claim 1 is characterized in that, this cholesterol liquid crystal uses the composite material that comprises nematic crystal and chiral dope.
6. black-white cholesterol liquid crystal display as claimed in claim 1 is characterized in that, this cholesterol liquid crystal is added with the dyestuff of absorption peak scope from 380~900nm.
7. black-white cholesterol liquid crystal display as claimed in claim 1 is characterized in that, this polymeric wall forms with the uv photopolymerization method.
8. black-white cholesterol liquid crystal display as claimed in claim 7 is characterized in that, this uv photopolymerization method comprises the following steps:
Expose to this display layer with ultraviolet light by a mask and finish exposure for the first time.
9. black-white cholesterol liquid crystal display as claimed in claim 8 is characterized in that, this uv photopolymerization method also comprises the following steps:
Directly expose to this display layer and finish exposure for the second time with ultraviolet light.
10. the manufacture method of a black-white cholesterol liquid crystal display is characterized in that, may further comprise the steps:
Substrate is provided, is formed at the both sides of this black-white cholesterol liquid crystal display;
Transparency electrode is provided, is formed at the inner surface of this substrate respectively;
Both alignment layers is provided, is formed at the inner surface of this transparency electrode respectively; And
One display layer is provided, is formed at the inboard of this both alignment layers, this display layer comprises the potpourri of cholesterol liquid crystal and high polymer monomer; And
With the uv photopolymerization method, in this display layer, form the macromolecule and the polymeric wall of cholesterol liquid crystal, diffusion, wherein, the fractionated polymer of described cholesterol liquid crystal and described diffusion is distributed in the formed zone of described polymeric wall.
11. manufacture method as claimed in claim 10 is characterized in that, this substrate is one of glass substrate, plastic base, metal substrate and flexible base plate.
12. manufacture method as claimed in claim 10 is characterized in that, this transparency electrode is used one of inorganic conductive material and organic conductive material.
13. manufacture method as claimed in claim 10 is characterized in that, this both alignment layers is used one of polyvinyl alcohol (PVA), pi, polyamide, polyureas, nylon, silicon dioxide, little groove structure and lecithin.
14. manufacture method as claimed in claim 10 is characterized in that, this cholesterol liquid crystal uses the composite material that comprises nematic crystal and chiral dope.
15. manufacture method as claimed in claim 10 is characterized in that, this cholesterol liquid crystal is added with the dyestuff of absorption peak scope from 380~900nm.
16. manufacture method as claimed in claim 10 is characterized in that, this uv photopolymerization method comprises the following steps:
Expose to this display layer with ultraviolet light by a mask and finish exposure for the first time.
17. manufacture method as claimed in claim 16 is characterized in that, this uv photopolymerization method also comprises the following steps:
Directly expose to this display layer and finish exposure for the second time with ultraviolet light.
CNB2004100778620A 2004-09-16 2004-09-16 Black-white cholesterol liquid crystal display and its producing method Active CN100395645C (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111273477A (en) * 2020-03-18 2020-06-12 深圳市前海威斯明科技有限公司 Liquid crystal display layer, preparation method thereof and liquid crystal display panel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109557706B (en) * 2018-12-03 2021-11-23 深圳市德安里科技有限公司 Liquid crystal dust-free blackboard and manufacturing method thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0926569A (en) * 1995-07-13 1997-01-28 Fujitsu Ltd Liquid crystal display device and its production
US5847798A (en) * 1991-05-02 1998-12-08 Kent State University Polymer stabilized black-white cholesteric reflective display
US6061107A (en) * 1996-05-10 2000-05-09 Kent State University Bistable polymer dispersed cholesteric liquid crystal displays
US6096392A (en) * 1997-07-09 2000-08-01 Daicel Chemical Industries, Ltd. Cholesteric liquid crystal display element
US6120701A (en) * 1997-03-28 2000-09-19 Hsu; Ying Yen Microencapsulated liquid crystal and a method and system for using same
US6203723B1 (en) * 1998-03-12 2001-03-20 Ying Yen Hsu Microencapsulated liquid crystal having multidomains induced by the polymer network and method
CN1497301A (en) * 2002-09-27 2004-05-19 伊斯曼柯达公司 Cholsteroid phase liquid crystal display system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5847798A (en) * 1991-05-02 1998-12-08 Kent State University Polymer stabilized black-white cholesteric reflective display
JPH0926569A (en) * 1995-07-13 1997-01-28 Fujitsu Ltd Liquid crystal display device and its production
US6061107A (en) * 1996-05-10 2000-05-09 Kent State University Bistable polymer dispersed cholesteric liquid crystal displays
US6120701A (en) * 1997-03-28 2000-09-19 Hsu; Ying Yen Microencapsulated liquid crystal and a method and system for using same
US6096392A (en) * 1997-07-09 2000-08-01 Daicel Chemical Industries, Ltd. Cholesteric liquid crystal display element
US6203723B1 (en) * 1998-03-12 2001-03-20 Ying Yen Hsu Microencapsulated liquid crystal having multidomains induced by the polymer network and method
CN1497301A (en) * 2002-09-27 2004-05-19 伊斯曼柯达公司 Cholsteroid phase liquid crystal display system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111273477A (en) * 2020-03-18 2020-06-12 深圳市前海威斯明科技有限公司 Liquid crystal display layer, preparation method thereof and liquid crystal display panel

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