CN103033969B - 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 Displays module, particularly a kind of preparation method based on the display module in the printed flexible display of double-deck PDLC tri-layers of drive electrode structure.
Background technology
Current display technique can be divided into two large classes: a class is papery display, and its principal feature is: carry out displaying contents by reflect ambient light, is easy to colored display, and angle of visibility large (close to 180 °), medium is soft.Another kind of is the electronical displays such as CRT, LCD, LED, and its principal feature is: information can fast refresh, and rely on the luminescence of display therein to carry out displaying contents, need to consume more electric energy during work, easily make people tired during reading, medium is not soft.
People are putting forth effort the exploitation reflective flexible display of class paper (being commonly called as Electronic Paper) nearly ten years, attempt to overcome the shortcoming of aforementioned two class display techniques and retain their advantage, though new display have flexible media, can quick automatically controlled displaying contents, by reflect ambient light display, low energy consumption, these features portable.Such flexible display can be applied to multiple fields such as e-book, automobile, smart card, label, digital signature, display.
To the research and development of the reflective flexible display of class paper, developing in the world is at present the electrophoretic techniques of the international corporations such as E-Ink, Phlips, IBM, Bell Laboratory faster, and its displaying principle moves sight line based on electric globule (being placed in microcapsules or the micro-cup) electrophoresis under electric field action of different colours (being white and black at present substantially) to present two kinds of diverse colors to the reflection of external ambient light.
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 take natural light as light source, be more suitable for human eye to read, and have be easy to colorize and flexibility, the response time is short, driving voltage is low, production cost is low, the simple advantage of manufacture craft, the some shortcomings existing for electrophoresis-type flexible display can be made up, there is good development prospect.But contrast is not high is the ubiquitous problem of current reflective flexible display, equally also annoyings the development of the printed flexible display based on PDLC.For improving this situation, adopting double-deck PDLC tri-layers of drive electrode version significantly can reduce the OFF state transmittance of the printed flexible display based on PDLC, thus significantly improving its contrast, but preparing craft research report extremely lacks.
Summary of the invention
The present invention is directed to the printed flexible display that can improve display comparison degree, adopt double-deck PDLC tri-layers of drive electrode structure, a kind of preparation method of high-contrast Flexible Displays module 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:
Based on a preparation method for double-deck PDLC printed flexible display module, it is characterized in that comprising the following steps:
(1) choose that flatness is high, the silicon chip of single-sided polishing or glass sheet as hard substrate, and with washed with de-ionized water hard substrate, cleaned post-drying, hard substrate surface is coated with one deck adhesion layer;
(2) adopt General plastics film as flexible substrate, flexible substrate wherein one is deposited with transparency conducting layer A on the surface, use washed with de-ionized water flexible substrate, through low temperature drying after having cleaned, and another surface of flexible substrate is laid on adhesion layer, adopt low-temperature setting adhesion layer, make flexible substrate smooth, be firmly fixed on 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 be made up of the electrically conducting transparent grizzly bar be parallel to each other by photoetching, etching technics, removes photoresist with absolute ethyl alcohol, and by washed with de-ionized water;
(4) one side adopting coating process to have an electrod-array A in flexible substrate applies one layer of polymeric dispersed liquid crystal film I, adopts UV-light photocuring metallization processes to make polymer dispersed liquid crystal film I solidification;
(5) sputtering technology deposit layer of transparent conductive layer B on polymer dispersed liquid crystal film I is adopted;
(6) coating process is adopted to apply one layer of polymeric dispersed liquid crystal film II on the surface at transparency conducting layer B;
(7) utilize coating machine smooth on the surface of polymer dispersed liquid crystal film II, closely cover on transparent flexible substrates, transparent flexible substrates adopts General plastics film, its surface bonding with polymer dispersed liquid crystal film II is with transparency conducting layer C, and transparency conducting layer C is etched into by photoetching, etching technics the electrod-array B be made up of the electrically conducting transparent grizzly bar be parallel to each other, after bonding together, adopt UV-light photocuring metallization processes that polymer dispersed liquid crystal film II is solidified and firmly bonding with transparent flexible substrates;
(8) chemical solvent put into by the device of the band hard substrate made after above-mentioned steps being completed, adhesion layer is made to dissolve 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 layer, obtain the required Flexible Displays module based on PDLC.
The surface smoothness of the hard substrate in step (1) is less than 5 μm.Adhesion layer described in 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 μm.
Transparency conducting layer in step (2), step (5) and step (7) adopts ito film, graphene film or ZnO nesa coating.
Polymer dispersed liquid crystal film I in step (4) and step (6) and polymer dispersed liquid crystal film II are by nematic liquid crystal, monomer, oligomer, light trigger in certain mass ratio composition, and thickness is 5-20 μm.
Transparency conducting layer B in step (5) is as the electrode publicly of electrod-array B in electrod-array A in step (3) and step (7).
Transparent flexible substrates in step (7) adopts the PET of surface band ITO conductive layer, adopt step (1), (2), (3) that the ITO conductive layer on transparent flexible substrates is processed into required electrode pattern successively, to be bonded in again the on-chip transparent flexible substrates of hard be immersed in chemical solvent make adhesion layer dissolve or lose activity, finally transparent flexible substrates is stripped down from hard substrate.Electrod-array B in step (7) and the middle mutual square crossing of electrod-array A formed of step (3), the conduction grizzly bar square crossing overlapping region in two electrod-arrays forms the pixel of Flexible Displays module.
Chemical solvent in step (8) is absolute ethyl alcohol.CMYK ink layer in step (8) by cyan, carmetta, yellow and black four look site repeated arrangement form, the corresponding Flexible Displays module pixel point in each site, is positioned at immediately below corresponding pixel.
The beneficial effect that the present invention has compared to prior art is: a kind of preparation method based on double-deck PDLC printed flexible display module provided by the invention, adopt double-deck PDLC tri-layers of drive electrode version significantly can reduce the OFF state transmittance of the printed flexible display based on PDLC, thus significantly improve its contrast, by selecting flatness high, the silicon chip of single-sided polishing or glass sheet are as hard substrate, and using hard substrate as the supporting layer in Flexible Displays module processing preparation process, not only ensure that machining precision, and the processing technology of the present invention made and microelectronic processing technology are compatible, thus simplify overall processing technology, reduce the production cost of product, improve the qualification rate of product, large batch of production can be realized.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of preparation method provided by the invention.
In 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 substrates, 10-CMYK ink layer.
Embodiment
Be further described technical scheme provided by the invention below in conjunction with accompanying drawing and specific embodiment, following examples do not form the restriction to the technical scheme that the present invention protects.
Based on a preparation method for double-deck PDLC printed flexible display module, it is characterized in that comprising the following steps:
(1) choose that flatness is high, the silicon chip of single-sided polishing or glass sheet as hard substrate 1, and with washed with de-ionized water hard substrate 1, cleaned post-drying, be coated with one deck adhesion layer 2 on the surface at hard substrate 1.Adopt single silicon chip of throwing as hard substrate 1, first carry out Substrate treatment: clean with acetone, ethanol and deionized water ultrasonic cleaning, dry 3 hours in 180 DEG C of vacuum drying ovens.Then on substrate, be coated with the dimethyl silicone polymer that a layer thickness is 50 μm;
(2) adopt General plastics film as flexible substrate 3, flexible substrate 3 wherein one is deposited with transparency conducting layer A 4 on the surface, use washed with de-ionized water flexible substrate 3, through low temperature drying after having cleaned, and another surface of flexible substrate 3 is laid on adhesion layer, adopt low-temperature setting adhesion layer, make flexible substrate 3 smooth, be firmly fixed on hard substrate 1.Use the PET of surface band ITO conductive layer as flexible substrate 3, first Substrate treatment is carried out: clean with acetone, ethanol and deionized water ultrasonic cleaning, dry three hours in 80 DEG C of vacuum drying ovens, then flexible substrate 3 is laid on adhesion layer 2, ITO conductive layer is non-stick junction, whole device is placed in baking oven to be cured for 2 hours at 80 DEG C, after solidification, makes flexible substrate 3 entirely be bonded on 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 by photoetching and etching technics the electrod-array A be made up of the electrically conducting transparent grizzly bar be parallel to each other, remove photoresist with absolute ethyl alcohol, and use washed with de-ionized water.The positive glue AZ1500 that spin coating 2 μm is thick on the transparency conducting layer 4 of ITO, 100 DEG C of front bakings 3 minutes, adopt German Karl Suss company MA6 photo-etching machine exposal, exposure power is 10mW/cm
2, the time shutter is 20 seconds, and development time is 40 seconds, washed with de-ionized water, and obtain required electrode pattern with ITO corrosive liquid etching ITO transparency conducting layer 4, etching time 2 minutes, removes photoresist with acetone, low temperature drying after washed with de-ionized water;
(4) one side adopting coating process to have an electrod-array A in flexible substrate applies one layer of polymeric dispersed liquid crystal film I 5, adopts 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: by urethane acrylate, hydroxypropyl acrylate and benzoin dimethylether are 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, fully stir 2 hours at 60 DEG C, form transparent Polymer Dispersed Liquid Crystal solution, coating machine is adopted to be coated on the electrod-array A that formed in step (3) by 10 μm of thick Polymer Dispersed Liquid Crystal dissolution homogeneity, form polymer dispersed liquid crystal film, with the Ultraviolet radiation device 15min of 365nm under room temperature, ultraviolet ray intensity is 5mw/cm
2, polymer dispersed liquid crystal film is solidified,
(5) sputtering technology deposit layer of transparent conductive layer B6 on polymer dispersed liquid crystal film I 5 is adopted.Adopt rf magnetron sputtering instrument on polymer dispersed liquid crystal film A 5, plate the thick ITO transparency conducting layer B 6 of one deck 0.2 μm, sputtering power is 70W, and operating air pressure is 0.5Pa, and sputtering time is 15min, and in work atmosphere, the ratio of oxygen and argon is 1 ︰ 20; Next gluing, photoetching, etching and degumming process is adopted to process required electrod-array at middle ITO transparency conducting layer B 6 successively, identical with step (3) of concrete technology step and technological parameter;
(6) coating process is adopted to apply one layer of polymeric dispersed liquid crystal film II 7 on the surface at transparency conducting layer B 6.Adopt coating machine to be coated on transparency conducting layer B 6 by the Polymer Dispersed Liquid Crystal dissolution homogeneity of preparation in step (4), thickness is 10 μm, 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 upper transparent flexible substrates 9 closely, transparent flexible substrates adopts General plastics film, its surface bonding with polymer dispersed liquid crystal film II 7 is with transparency conducting layer C 8, and pass through photoetching, transparency conducting layer C 8 is etched into the electrod-array B be made up of the electrically conducting transparent grizzly bar be parallel to each other by etching technics, electrod-array B and the middle mutual square crossing of electrod-array A formed of step (3), conduction grizzly bar square crossing overlapping region in two electrod-arrays forms the pixel of Flexible Displays module, after bonding together, adopt UV-light photocuring metallization processes that polymer dispersed liquid crystal film II is solidified and firmly bonding with transparent flexible substrates.Adopt the PET of surface band ITO conductive layer as transparent flexible substrates 9, adopt step (1) successively, (2), (3) the ITO conductive layer on transparent flexible substrates 9 is processed into required transparent electrode arrays B 8, then will be bonded in the on-chip transparent flexible substrates 9 of hard is immersed in absolute ethyl alcohol, dimethyl silicone polymer adhesion layer is lost activity, transparent flexible substrates 9 is stripped down from hard substrate, coating machine is adopted closely to be covered on polymer dispersed liquid crystal film by transparent flexible substrates 9, the electrode pattern face of transparent flexible substrates 9 is bonding plane, at room temperature employing wavelength is the composite membrane 15min of the Ultraviolet radiation band hard substrate of 365nm, ultraviolet ray intensity is 5mw/cm2, polymer dispersed liquid crystal film is solidified and is formed good bonding with transparent flexible substrates,
(8) chemical solvent put into by the device of the band hard substrate 1 made after above-mentioned steps being completed, adhesion layer 2 is made to dissolve 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 layer 10, CMYK ink layer by cyan, carmetta, yellow and black four look site repeated arrangement form, the corresponding Flexible Displays module pixel point in each site, be positioned at immediately below corresponding pixel, obtain the required Flexible Displays module based on PDLC.
The hard substrate that the present invention adopts flatness higher is as the supporting layer based on double-deck PDLC printed flexible display module, not only ensure that the machining precision of flexible substrate top electrode figure, also can be compatible with microelectronic technique, and adopt double-deck PDLC tri-layers of drive electrode version significantly can reduce the OFF state transmittance of the printed flexible display based on PDLC, compared 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 (9)
1., based on a preparation method for double-deck PDLC printed flexible display module, it is characterized in that comprising the following steps:
(1) choose that flatness is high, the silicon chip of single-sided polishing or glass sheet as hard substrate, and with washed with de-ionized water hard substrate, cleaned post-drying, hard substrate surface is coated with one deck adhesion layer;
(2) adopt General plastics film as flexible substrate, flexible substrate wherein one is deposited with transparency conducting layer A on the surface, use washed with de-ionized water flexible substrate, through low temperature drying after having cleaned, and another surface of flexible substrate is laid on adhesion layer, adopt low-temperature setting adhesion layer, make flexible substrate smooth, be firmly fixed on 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 be made up of the electrically conducting transparent grizzly bar be parallel to each other by photoetching, etching technics, removes photoresist with absolute ethyl alcohol, and by washed with de-ionized water;
(4) one side adopting coating process to have an electrod-array A in flexible substrate applies one layer of polymeric dispersed liquid crystal film I, adopts UV-light photocuring metallization processes to make polymer dispersed liquid crystal film I solidification;
(5) sputtering technology deposit layer of transparent conductive layer B on polymer dispersed liquid crystal film I is adopted;
(6) coating process is adopted to apply one layer of polymeric dispersed liquid crystal film II on the surface at transparency conducting layer B;
(7) utilize coating machine smooth on the surface of polymer dispersed liquid crystal film II, cover upper transparent flexible substrates closely, transparent flexible substrates adopts General plastics film, its surface bonding with polymer dispersed liquid crystal film II is with transparency conducting layer C, and pass through photoetching, transparency conducting layer C is etched into the electrod-array B be made up of the electrically conducting transparent grizzly bar be parallel to each other by etching technics, after bonding together, adopt UV-light photocuring metallization processes that polymer dispersed liquid crystal film II is solidified and firmly bonding with transparent flexible substrates, and electrod-array B and the middle mutual square crossing of electrod-array A formed of step (3), conduction grizzly bar square crossing overlapping region in two electrod-arrays forms the pixel of Flexible Displays module,
(8) chemical solvent put into by the device of the band hard substrate made after above-mentioned steps being completed, adhesion layer is made to dissolve 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 layer, obtain the required Flexible Displays module based on PDLC.
2. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, is characterized in that: the surface smoothness of the hard substrate in step (1) is less than 5 μm.
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 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 μm.
4. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, is characterized in that: the transparency conducting layer in step (2), step (5) and step (7) adopts ito film, graphene film or ZnO nesa coating.
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 step (6) and polymer dispersed liquid crystal film II are by nematic liquid crystal, monomer, oligomer, light trigger forms in certain mass ratio, thickness is 5-20 μm, the composition of polymer dispersed liquid crystal film: by urethane acrylate, hydroxypropyl acrylate and benzoin dimethylether are mixed with transparent prepolymer by quality proportioning 1 ︰ 2 ︰ 0.03 mix and blend, add nematic liquid crystal P0616A, liquid crystal and prepolymer mass ratio are 6 ︰ 4.
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 step (5) is as the electrode publicly of electrod-array B in electrod-array A in step (3) and 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 substrates in step (7) adopts the PET of surface band ITO conductive layer, adopt step (1), (2), (3) that the ITO conductive layer on transparent flexible substrates is processed into required electrode pattern successively, to be bonded in again the on-chip transparent flexible substrates of hard be immersed in chemical solvent make adhesion layer dissolve or lose activity, finally transparent flexible substrates is stripped down from hard substrate.
8. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, is characterized in that: the chemical solvent in step (8) is absolute ethyl alcohol.
9. the preparation method based on double-deck PDLC printed flexible display module according to claim 1, it is characterized in that: the CMYK ink layer in step (8) by cyan, carmetta, yellow and black four look site repeated arrangement form, the corresponding Flexible Displays module pixel point in each site, is positioned at immediately below corresponding pixel.
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| CN107689264B (en) * | 2017-08-11 | 2023-05-09 | 宁波大学 | Transparent conductive film and preparation method thereof, and preparation method of polymer dispersed liquid crystal component |
| US20200070466A1 (en) * | 2017-09-26 | 2020-03-05 | Lg Chem, Ltd. | Patterned film for transferring display pixels and method for preparing display using same |
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| 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 |
| 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 |
| 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 |
| 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 |
| 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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