CN103033969A - Method for preparing printed flexible display module based on double-layer PDLC (Polymer Dispersed Liquid Crystal) - Google Patents
Method for preparing printed flexible display module based on double-layer PDLC (Polymer Dispersed Liquid Crystal) Download PDFInfo
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Abstract
The invention provides a method for preparing a printed flexible display module based on double-layer PDLC (Polymer Dispersed Liquid Crystal). The method comprises the following steps: flatly fixing a flexible substrate with a transparent conducting layer on a rigid chip through an adhesion layer, and enabling the transparent conducting layer to form an electrode array A through a photolithographic process; coating and photo-curing a first layer of PDLC membrane, sputtering a transparent conducting layer B, and then coating a second layer of PDLC membrane; covering a transparent flexible chip with a transparent electrode array C on the second layer of PDLC membrane, carrying out photo-curing, and then separating the rigid chip from a device; and adopting a printing process to airbrush a CMYK (cyan, magenta, yellow and black) ink layer on the back of the flexible substrate. The method adopts the double-layer PDLC structure and can effectively reduce the off-state transmittance and increase the display contrast under the condition that the driving voltage is increased. Meanwhile, the rigid chip is used as a support layer in the processing of a flexible display module, so that the processing precision can be ensured, and the method is compatible with a microelectronic process. The whole process is simple, the cost is low, and the method is easy for mass production.
Description
Technical field
The present invention relates to a kind of preparation method of flexible display module, particularly a kind of preparation method based on the display module in the printed flexible display of three layers of drive electrode structure of double-deck PDLC.
Background technology
Present display technique can be divided into two large classes: a class is that papery shows, its principal feature is: come displaying contents by reflect ambient light, be easy to colored the demonstration, and angle of visibility large (near 180 °), medium is soft.Another kind of is the electronical displays such as CRT, LCD, LED, and its principal feature is: but the information fast refresh relies on display self internal illumination to come displaying contents, need to consume more electric energy during work, easily makes the people tired during reading, and medium is not soft.
People are putting forth effort to develop the reflective flexible display of class paper (being commonly called as Electronic Paper) over past ten years, the advantage of attempting to overcome the shortcoming of aforementioned two class display techniques and keeping them, though new display have flexible media, can quick automatically controlled displaying contents, by reflect ambient light demonstration, low energy consumption, portable these characteristics.Such flexible display can be applied to a plurality of fields such as e-book, automobile, smart card, label, digital signature, display.
Research and development to the reflective flexible display of class paper, at present development is the electrophoretic techniques of the international corporations such as E-Ink, Phlips, IBM, Bell Laboratory faster in the world, and the electrophoresis of electric globule (placing microcapsules or little cup) under electric field action that its displaying principle is based on different colours (being white and black at present basically) moves sight line the reflection of external ambient light is presented two kinds of diverse colors.
Printed flexible display based on polymer dispersed liquid crystal film (PDLC) is the reflective flexible display of a kind of novel class paper.This display is take natural light as light source, be more suitable for reading in human eye, and have the colorize of being easy to and flexibility, the response time is short, driving voltage is low, production cost is low, the simple advantage of manufacture craft, can remedy the existing some shortcomings of electrophoresis-type flexible display, have good development prospect.Yet contrast is not high to be the ubiquitous problem of present reflective flexible display, is equally also perplexing the development based on the printed flexible display of PDLC.For improving this situation, adopt three layers of drive electrode version of double-deck PDLC can significantly reduce OFF state transmittance based on the printed flexible display of PDLC, thereby significantly improve its contrast, but preparing craft research report very lacks.
Summary of the invention
The present invention is directed to the printed flexible display that can improve the display comparison degree, adopt three layers of drive electrode structure of double-deck PDLC, the preparation method of the flexible display module of a kind of high-contrast is provided, has the advantages that preparation technology is simple, craft precision is high, production cost is low, yield rate is high, can be mass-produced.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of preparation method based on double-deck PDLC printed flexible display module is characterized in that may further comprise the steps:
(1) choose that flatness is high, the silicon chip of single-sided polishing or glass sheet be as the hard substrate, and with washed with de-ionized water hard substrate, cleaned post-drying, at hard substrate surface coating one deck adhesion layer;
(2) adopt General plastics film as flexible substrate, flexible substrate wherein is deposited with transparency conducting layer A on the surface, use the washed with de-ionized water flexible substrate, after having cleaned through low temperature drying, and another surface of flexible substrate is tiled on the adhesion layer, adopt the low-temperature setting adhesion layer, make flexible substrate smooth, firmly be fixed on the hard substrate;
(3) spin coating photoresist on the surface of transparency conducting layer A, and transparency conducting layer A is etched into the electrod-array A that is formed by the electrically conducting transparent grizzly bar that is parallel to each other by photoetching, etching technics, remove photoresist with absolute ethyl alcohol, and use washed with de-ionized water;
(4) adopt coating process to have the one side coating one layer of polymeric dispersed liquid crystal film I of electrod-array A in flexible substrate, adopt the UV-light photocuring metallization processes that the polymer dispersed liquid crystal film I is solidified;
(5) adopt sputtering technology deposit layer of transparent conductive layer B on the polymer dispersed liquid crystal film I;
(6) adopt coating process in transparency conducting layer B surface coating one layer of polymeric dispersed liquid crystal film II;
(7) utilize coating machine smooth on the surface of polymer dispersed liquid crystal film II, cover the transparent flexible substrate closely, the transparent flexible substrate adopts General plastics film, the bonding surface of itself and polymer dispersed liquid crystal film II is with transparency conducting layer C, and transparency conducting layer C is etched into the electrod-array B that is formed by the electrically conducting transparent grizzly bar that is parallel to each other by photoetching, etching technics, after bonding together, adopt the UV-light photocuring metallization processes to make polymer dispersed liquid crystal film II curing and firmly bonding with the transparent flexible substrate;
(8) device with the hard substrate of making after above-mentioned steps is finished is put into chemical solvent, adhesion layer is dissolved in chemical solvent or lose activity, then hard substrate and device are peeled off, adopt printing technology at flexible substrate back side air brushing one deck CMYK ink lay, obtain the required flexible display module based on PDLC.
The surface smoothness of the hard substrate in the step (1) is less than 5 μ m.Adhesion layer described in the step (1) adopts dimethyl silicone polymer or acrylate bonded adhesives or epoxy resin bonded adhesives to make, and the thickness of adhesion layer is 50-200 μ m.
Transparency conducting layer in step (2), step (5) and the step (7) adopts ITO film, graphene film or ZnO nesa coating.
Polymer dispersed liquid crystal film I in step (4) and the step (6) and polymer dispersed liquid crystal film II form in the certain mass ratio by nematic liquid crystal, monomer, oligomer, light trigger, and thickness is 5-20 μ m.
Transparency conducting layer B in the step (5) is as the publicly electrode of electrod-array B in electrod-array A in the step (3) and the step (7).
Transparent flexible substrate in the step (7) adopts the PET of surface band ITO conductive layer, adopt successively step (1), (2), (3) that the on-chip ITO conductive layer of transparent flexible is processed into needed electrode pattern, to be bonded in again the on-chip transparent flexible substrate of hard and be immersed in and make adhesion layer dissolving in the chemical solvent or lose activity, at last the transparent flexible substrate be stripped down from the hard substrate.The mutual square crossing of electrod-array A that forms in electrod-array B in the step (7) and the step (3), the conduction grizzly bar square crossing in two electrod-arrays overlaps the pixel that the zone consists of flexible display module.
Chemical solvent in the step (8) is absolute ethyl alcohol.CMYK ink lay in the step (8) is comprised of cyan, carmetta, yellow and black four look site repeated arrangement, the corresponding flexible display module pixel in each site, be positioned at institute's corresponding pixel points under.
The present invention than the beneficial effect that prior art has is: a kind of preparation method based on double-deck PDLC printed flexible display module provided by the invention, adopt three layers of drive electrode version of double-deck PDLC can significantly reduce OFF state transmittance based on the printed flexible display of PDLC, thereby significantly improve its contrast, by selecting flatness high, the silicon chip of single-sided polishing or glass sheet are as the hard substrate, and with the hard substrate as the supporting layer in the flexible display module processing preparation process, not only guaranteed machining precision, and the processing technology of the present invention that makes and microelectronic processing technology compatibility, thereby simplified whole processing technology, reduced the production cost of product, improve the qualification rate of product, can realize large batch of production.
Description of drawings
Fig. 1 is preparation method's provided by the invention process flow diagram.
In the accompanying drawing: 1-hard substrate, 2-adhesion layer, 3-flexible substrate, 4-transparency conducting layer A, 5-polymer dispersed liquid crystal film I, 6-transparency conducting layer B, 7-polymer dispersed liquid crystal film II, 8-transparency conducting layer C, 9-transparent flexible substrate, 10-CMYK ink lay.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment technical scheme provided by the invention is further described, following examples do not consist of the restriction of the technical scheme that the present invention is protected.
A kind of preparation method based on double-deck PDLC printed flexible display module is characterized in that may further comprise the steps:
(1) choose that flatness is high, the silicon chip of single-sided polishing or glass sheet be as hard substrate 1, and with washed with de-ionized water hard substrate 1, cleaned post-drying, at hard substrate 1 surface coating one deck adhesion layer 2.Adopt single silicon chip of throwing as hard substrate 1, at first carry out substrate and process: clean with acetone, ethanol and deionized water ultrasonic cleaning, oven dry is 3 hours in 180 ℃ of vacuum drying ovens.Then be the dimethyl silicone polymer of 50 μ m in substrate coating a layer thickness;
(2) adopt General plastics film as flexible substrate 3, flexible substrate 3 wherein is deposited with transparency conducting layer A 4 on the surface, use washed with de-ionized water flexible substrate 3, after having cleaned through low temperature drying, and another surface of flexible substrate 3 is tiled on the adhesion layer, adopt the low-temperature setting adhesion layer, make flexible substrate 3 smooth, firmly be fixed on the hard substrate 1.Use the PET of surface band ITO conductive layer as flexible substrate 3, at first carrying out substrate processes: clean with acetone, ethanol and deionized water ultrasonic cleaning, oven dry is three hours in 80 ℃ of vacuum drying ovens, then flexible substrate 3 is tiled on the adhesion layer 2, the ITO conductive layer is non-bonding plane, place baking oven to be cured in lower 2 hours at 80 ℃ whole device, flexible substrate 3 entirely is bonded on the hard substrate 1;
(3) spin coating photoresist on the surface of transparency conducting layer A 4, and transparency conducting layer A 4 is etched into the electrod-array A that is formed by the electrically conducting transparent grizzly bar that is parallel to each other by photoetching and etching technics, remove photoresist with absolute ethyl alcohol, and use washed with de-ionized water.The thick positive glue AZ1500 of spin coating 2 μ m on the transparency conducting layer 4 of ITO, 100 ℃ of front bakings 3 minutes adopt the German Karl Suss MA6 of company photo-etching machine exposal, and exposure power is 10mW/cm
2, the time shutter is 20 seconds, and development time is 40 seconds, and washed with de-ionized water obtains required electrode pattern with ITO corrosive liquid etching ITO transparency conducting layer 4, and etching time 2 minutes is removed photoresist with acetone, low temperature drying after the washed with de-ionized water;
(4) adopt coating process to have the one side coating one layer of polymeric dispersed liquid crystal film I 5 of electrod-array A in flexible substrate, adopt the UV-light photocuring metallization processes that polymer dispersed liquid crystal film I 5 is solidified.The method for making of polymer dispersed liquid crystal film: with urethane acrylate, hydroxypropyl acrylate and benzoin dimethylether were mixed with transparent prepolymer in 1 hour by quality proportioning 1 ︰ 2 ︰ 0.03 mix and blend, add nematic liquid crystal P0616A, liquid crystal and prepolymer mass ratio are 6 ︰ 4,60 ℃ of lower fully stirrings 2 hours, form transparent Polymer Dispersed Liquid Crystal solution, adopt the coating machine Polymer Dispersed Liquid Crystal solution that 10 μ m are thick to be coated on equably on the electrod-array A that forms in the step (3), form polymer dispersed liquid crystal film, with the ultraviolet radiation device spare 15min of 365nm, ultraviolet ray intensity is 5mw/cm under the room temperature
2, polymer dispersed liquid crystal film is solidified;
(5) adopt sputtering technology deposit layer of transparent conductive layer B 6 on polymer dispersed liquid crystal film I 5.Adopt the rf magnetron sputtering instrument to plate the thick ITO transparency conducting layer B 6 of one deck 0.2 μ m at polymer dispersed liquid crystal film A 5, sputtering power is 70W, and operating air pressure is 0.5Pa, and sputtering time is 15min, and the ratio of oxygen and argon is 1 ︰ 20 in the work atmosphere; Next adopt successively gluing, photoetching, etching and degumming process to process required electrod-array at middle ITO transparency conducting layer B 6, identical in concrete technology step and technological parameter and the step (3);
(6) adopt coating process in transparency conducting layer B 6 surfaces coating one layer of polymeric dispersed liquid crystal film II 7.Adopt coating machine that the Polymer Dispersed Liquid Crystal solution of preparation in the step (4) is coated on the transparency conducting layer B 6 equably, thickness is 10 μ m, forms polymer dispersed liquid crystal film II 7;
(7) utilize coating machine smooth on the surface of polymer dispersed liquid crystal film II 7, cover closely upper transparent flexible substrate 9, the transparent flexible substrate adopts General plastics film, the bonding surface of itself and polymer dispersed liquid crystal film II 7 is with transparency conducting layer C 8, and by photoetching, etching technics is etched into transparency conducting layer C 8 the electrod-array B that is comprised of the electrically conducting transparent grizzly bar that is parallel to each other, the mutual square crossing of electrod-array A that forms in electrod-array B and the step (3), conduction grizzly bar square crossing in two electrod-arrays overlaps the pixel that the zone consists of flexible display module, after bonding together, adopt the UV-light photocuring metallization processes to make polymer dispersed liquid crystal film II curing and firmly bonding with the transparent flexible substrate.Adopt the PET of surface band ITO conductive layer as transparent flexible substrate 9, adopt successively step (1), (2), (3) the ITO conductive layer on the transparent flexible substrate 9 is processed into needed transparency electrode array B 8, then will be bonded in the on-chip transparent flexible substrate 9 of hard is immersed in the absolute ethyl alcohol, the dimethyl silicone polymer adhesion layer is lost activity, transparent flexible substrate 9 is stripped down from the hard substrate, adopt coating machine closely to cover transparent flexible substrate 9 on the polymer dispersed liquid crystal film, the electrode pattern face of transparent flexible substrate 9 is bonding plane, at room temperature adopting wavelength is that the ultraviolet ray irradiation of 365nm is with the composite membrane 15min of hard substrate, ultraviolet ray intensity is 5mw/cm2, polymer dispersed liquid crystal film is solidified and forms good bonding with the transparent flexible substrate;
(8) device with hard substrate 1 of making after above-mentioned steps is finished is put into chemical solvent, adhesion layer 2 is dissolved in chemical solvent or lose activity, then hard substrate 1 and device are peeled off, adopt printing technology at flexible substrate back side air brushing one deck CMYK ink lay 10, the CMYK ink lay is comprised of cyan, carmetta, yellow and black four look site repeated arrangement, the corresponding flexible display module pixel in each site, be positioned at institute's corresponding pixel points under, obtain the required flexible display module based on PDLC.
The present invention adopts the higher hard substrate of flatness as the supporting layer based on double-deck PDLC printed flexible display module, not only guaranteed the machining precision of flexible substrate top electrode figure, also can be compatible with microelectronic technique, and adopt three layers of drive electrode version of double-deck PDLC can significantly reduce OFF state transmittance based on the printed flexible display of PDLC, compare with existing technology, this preparation technology is simpler, craft precision is high, and production cost is low, yield rate is high, can realize producing in enormous quantities.
Claims (10)
1. preparation method based on double-deck PDLC printed flexible display module is characterized in that may further comprise the steps:
(1) choose that flatness is high, the silicon chip of single-sided polishing or glass sheet be as the hard substrate, and with washed with de-ionized water hard substrate, cleaned post-drying, at hard substrate surface coating one deck adhesion layer;
(2) adopt General plastics film as flexible substrate, flexible substrate wherein is deposited with transparency conducting layer A on the surface, use the washed with de-ionized water flexible substrate, after having cleaned through low temperature drying, and another surface of flexible substrate is tiled on the adhesion layer, adopt the low-temperature setting adhesion layer, make flexible substrate smooth, firmly be fixed on the hard substrate;
(3) spin coating photoresist on the surface of transparency conducting layer A, and transparency conducting layer A is etched into the electrod-array A that is formed by the electrically conducting transparent grizzly bar that is parallel to each other by photoetching, etching technics, remove photoresist with absolute ethyl alcohol, and use washed with de-ionized water;
(4) adopt coating process to have the one side coating one layer of polymeric dispersed liquid crystal film I of electrod-array A in flexible substrate, adopt the UV-light photocuring metallization processes that the polymer dispersed liquid crystal film I is solidified;
(5) adopt sputtering technology deposit layer of transparent conductive layer B on the polymer dispersed liquid crystal film I;
(6) adopt coating process in transparency conducting layer B surface coating one layer of polymeric dispersed liquid crystal film II;
(7) utilize coating machine smooth on the surface of polymer dispersed liquid crystal film II, cover the transparent flexible substrate closely, the transparent flexible substrate adopts General plastics film, the bonding surface of itself and polymer dispersed liquid crystal film II is with transparency conducting layer C, and transparency conducting layer C is etched into the electrod-array B that is formed by the electrically conducting transparent grizzly bar that is parallel to each other by photoetching, etching technics, after bonding together, adopt the UV-light photocuring metallization processes to make polymer dispersed liquid crystal film II curing and firmly bonding with the transparent flexible substrate;
(8) device with the hard substrate of making after above-mentioned steps is finished is put into chemical solvent, adhesion layer is dissolved in chemical solvent or lose activity, then hard substrate and device are peeled off, adopt printing technology at flexible substrate back side air brushing one deck CMYK ink lay, obtain the required flexible display module based on PDLC.
2. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, it is characterized in that: the surface smoothness of the hard substrate in the step (1) is less than 5 μ m.
3. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, it is characterized in that: the adhesion layer described in the step (1) adopts dimethyl silicone polymer or acrylate bonded adhesives or epoxy resin bonded adhesives to make, and the thickness of adhesion layer is 50-200 μ m.
4. the preparation method based on double-deck PDLC printed flexible display module according to claim 1 is characterized in that: transparency conducting layer employing ITO film, graphene film or ZnO nesa coating in step (2), step (5) and the step (7).
5. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, it is characterized in that: the polymer dispersed liquid crystal film I in step (4) and the step (6) and polymer dispersed liquid crystal film II form in the certain mass ratio by nematic liquid crystal, monomer, oligomer, light trigger, and thickness is 5-20 μ m.
6. the preparation method based on double-deck PDLC printed flexible display module according to claim 1 is characterized in that: the transparency conducting layer B in the step (5) is as the publicly electrode of electrod-array B in electrod-array A in the step (3) and the step (7).
7. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, it is characterized in that: the transparent flexible substrate in the step (7) adopts the PET of surface band ITO conductive layer, adopt successively step (1), (2), (3) that the on-chip ITO conductive layer of transparent flexible is processed into needed electrode pattern, to be bonded in again the on-chip transparent flexible substrate of hard and be immersed in and make adhesion layer dissolving in the chemical solvent or lose activity, at last the transparent flexible substrate be stripped down from the hard substrate.
8. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, it is characterized in that: the mutual square crossing of electrod-array A that forms in the electrod-array B in the step (7) and the step (3), the conduction grizzly bar square crossing in two electrod-arrays overlaps the pixel that the zone consists of flexible display module.
9. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, it is characterized in that: the chemical solvent in the step (8) is absolute ethyl alcohol.
10. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, it is characterized in that: the CMYK ink lay in the step (8) is comprised of cyan, carmetta, yellow and black four look site repeated arrangement, the corresponding flexible display module pixel in each site, be positioned at institute's corresponding pixel points under.
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| CN107689264A (en) * | 2017-08-11 | 2018-02-13 | 宁波大学 | Transparent conductive film and preparation method, the preparation method of PDLC component |
| CN108345133A (en) * | 2017-12-13 | 2018-07-31 | 安徽国隆玻璃科技有限公司 | A kind of electric-controlled light-regulating doubling glass and its manufacturing process |
| CN108873435A (en) * | 2018-07-11 | 2018-11-23 | 信利半导体有限公司 | Production method, array substrate and the liquid crystal display of array substrate |
| TWI688076B (en) * | 2017-09-26 | 2020-03-11 | 南韓商Ｌｇ化學股份有限公司 | Pattern film for transferring display pixel and method for manufacturing display using the same |
| CN111077690A (en) * | 2019-12-30 | 2020-04-28 | 南京大学 | Full-color low-power-consumption electronic thin film display device and method |
| CN113156687A (en) * | 2021-03-24 | 2021-07-23 | 深圳市蔚来芯科技有限公司 | Flexible electronic paper electronic display device and manufacturing method thereof |
| CN113376891A (en) * | 2021-06-30 | 2021-09-10 | 汕头超声显示器（二厂）有限公司 | Manufacturing method of flexible PDLC device |
| CN114832744A (en) * | 2022-05-31 | 2022-08-02 | 北京印刷学院 | Hydrogel-based liquid core microcapsule and preparation method and application thereof |
| CN117111351A (en) * | 2023-10-23 | 2023-11-24 | 上海隆昇光电新材料有限公司 | PDLC dimming film with four-state transition and assembly thereof |
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| CN107689264A (en) * | 2017-08-11 | 2018-02-13 | 宁波大学 | Transparent conductive film and preparation method, the preparation method of PDLC component |
| TWI688076B (en) * | 2017-09-26 | 2020-03-11 | 南韓商Ｌｇ化學股份有限公司 | Pattern film for transferring display pixel and method for manufacturing display using the same |
| CN108345133A (en) * | 2017-12-13 | 2018-07-31 | 安徽国隆玻璃科技有限公司 | A kind of electric-controlled light-regulating doubling glass and its manufacturing process |
| CN108873435B (en) * | 2018-07-11 | 2021-09-17 | 信利半导体有限公司 | Manufacturing method of array substrate, array substrate and liquid crystal display |
| CN108873435A (en) * | 2018-07-11 | 2018-11-23 | 信利半导体有限公司 | Production method, array substrate and the liquid crystal display of array substrate |
| CN111077690A (en) * | 2019-12-30 | 2020-04-28 | 南京大学 | Full-color low-power-consumption electronic thin film display device and method |
| CN113156687A (en) * | 2021-03-24 | 2021-07-23 | 深圳市蔚来芯科技有限公司 | Flexible electronic paper electronic display device and manufacturing method thereof |
| CN113376891A (en) * | 2021-06-30 | 2021-09-10 | 汕头超声显示器（二厂）有限公司 | Manufacturing method of flexible PDLC device |
| CN113376891B (en) * | 2021-06-30 | 2023-02-17 | 汕头超声显示器（二厂）有限公司 | Manufacturing method of flexible PDLC device |
| CN114832744A (en) * | 2022-05-31 | 2022-08-02 | 北京印刷学院 | Hydrogel-based liquid core microcapsule and preparation method and application thereof |
| CN114832744B (en) * | 2022-05-31 | 2023-08-18 | 北京印刷学院 | Hydrogel-based liquid core microcapsule and preparation method and application thereof |
| CN117111351A (en) * | 2023-10-23 | 2023-11-24 | 上海隆昇光电新材料有限公司 | PDLC dimming film with four-state transition and assembly thereof |
| CN117111351B (en) * | 2023-10-23 | 2024-01-30 | 上海隆昇光电新材料有限公司 | PDLC dimming film with four-state transition and assembly thereof |
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