CN-122018202-A - Display panel and preparation method thereof

CN122018202ACN 122018202 ACN122018202 ACN 122018202ACN-122018202-A

Abstract

The application discloses a preparation method of a display panel and the display panel. The manufacturing method of the display panel comprises the steps of manufacturing at least three curable cholesteric liquid crystal compositions, providing a first substrate, injecting the at least three curable cholesteric liquid crystal compositions into a plurality of pixel accommodating areas by adopting an ink-jet printing process, injecting one curable cholesteric liquid crystal composition into each pixel accommodating area, curing the curable cholesteric liquid crystal compositions in the pixel accommodating areas to enable the curable compositions to be cured to form a film coating layer, wherein the film coating layer wraps the cholesteric liquid crystal to form cholesteric liquid crystal capsules, and providing a second substrate, and attaching and packaging the second substrate with the first substrate. By adopting the preparation method, the problems that adjacent sub-pixels are mixed due to the movement and diffusion of the cholesteric liquid crystal, the reflectivity of the cholesteric liquid crystal is reduced, and the picture display effect is affected are solved.

Inventors

LIN XIQIAN
XIA JUNWEI
ZHENG LIBIN
LI MINGXU
FU WENJIE
DONG JUNJIE

Assignees

绵阳惠科光电科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260330

Claims (10)

1. A method for manufacturing a display panel, comprising: preparing at least three curable cholesteric liquid crystal compositions, wherein each of the curable cholesteric liquid crystal compositions comprises a curable component, a curing initiator, and one cholesteric liquid crystal; The manufacturing method comprises the steps of providing a first substrate, wherein the first substrate comprises a first substrate, a driving circuit layer, a first electrode layer and a retaining wall layer which are sequentially stacked, the retaining wall layer comprises a plurality of retaining walls, and a plurality of pixel accommodating areas are formed by surrounding the retaining walls; Injecting at least three of said curable cholesteric liquid crystal compositions into a plurality of said pixel-receiving areas using an inkjet printing process, each of said pixel-receiving areas being injected with one of said curable cholesteric liquid crystal compositions; Curing the curable cholesteric liquid crystal composition within the pixel-receiving area to cure the curable component to form a thin film coating that encapsulates the cholesteric liquid crystal to form cholesteric liquid crystal capsules; and providing a second substrate, attaching and packaging the second substrate and the first substrate, wherein the second substrate covers and seals the pixel accommodating area.
2. The method for manufacturing a display panel according to claim 1, wherein, The preparation of at least three curable cholesteric liquid crystal compositions comprises the following steps: Providing three groups of same nematic liquid crystal matrixes, adding chiral dopants into each group of nematic liquid crystal matrixes, and preparing three types of cholesteric liquid crystals, wherein the cholesteric liquid crystals of different types can reflect light rays of different colors, and the types of the chiral dopants are the same in the three types of cholesteric liquid crystals, and the mass part ratio of the chiral dopants is 1:1.5:2; uniformly mixing 1 part by mass of each cholesteric liquid crystal with 7-8 parts by mass of the curable component and 1-2 parts by mass of a curing initiator respectively to form the curable cholesteric liquid crystal composition.
3. The method of manufacturing a display panel according to claim 1, wherein the curing initiator is a photo-curing initiator; the step of curing the curable cholesteric liquid crystal composition in the pixel accommodating area specifically includes: The first substrate is placed in an inert gas environment, ultraviolet light with the illumination intensity of 48mW/cm <2 > -52mW/cm <2 > is adopted to irradiate the first substrate for 55S-65S, the wavelength of the ultraviolet light is 360nm-370nm, and the inert gas comprises nitrogen.
4. The method of manufacturing a display panel according to claim 3, wherein the photo-curing initiator comprises phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide.
5. The method of manufacturing a display panel according to claim 1, wherein the curing initiator is a thermal curing initiator; the step of curing the curable cholesteric liquid crystal composition in the pixel accommodating area specifically includes: And placing the first substrate into an inert gas environment, and heating the first substrate by adopting a heating device, wherein the heating temperature is 35-45 ℃ and the heating time is 12-18 min, and the inert gas comprises nitrogen.
6. The method of manufacturing a display panel according to claim 5, wherein, The thermal curing initiator comprises dibenzoyl peroxide or azobisisobutyronitrile.
7. The method for manufacturing a display panel according to claim 1, wherein, The curable component comprises any one or more of polyethylene glycol diacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, N-vinyl pyrrolidone, hydrophilic polyurethane acrylate, an acryloxy-containing compound or a vinyl-containing compound.
8. The method for manufacturing a display panel according to claim 1, wherein, After curing the curable cholesteric liquid crystal composition in the pixel accommodating area, the formed film coating layer is gel-like.
9. The method for manufacturing a display panel according to claim 1, wherein, After the curable cholesteric liquid crystal composition in the pixel accommodating area is cured, the reflectance of the cholesteric liquid crystal capsules is equal to or greater than 85% of the reflectance of the cholesteric liquid crystal to which the curable component is not added.
10. A display panel, which is characterized in that, The display panel is prepared and formed by adopting the preparation method of the display panel as claimed in any one of claims 1 to 8; The display panel comprises a first cholesteric liquid crystal, a second cholesteric liquid crystal and a third cholesteric liquid crystal, wherein the first cholesteric liquid crystal can reflect red light, the second cholesteric liquid crystal can reflect green light and the third cholesteric liquid crystal can reflect blue light; the second substrate comprises a second substrate and a second electrode layer, wherein the second substrate is a transparent substrate, and the second electrode layer is a transparent electrode layer.

Description

Display panel and preparation method thereof Technical Field The application relates to the technical field of display, in particular to a preparation method of a display panel and the display panel. Background The electronic paper technology has the advantages of low power consumption, comfortable vision and the like, and is increasingly widely applied, so that the market demand is rapidly increased. Currently, the mainstream electronic paper technology in the market is the electrophoretic electronic ink technology, however, the cholesteric liquid crystal technology is a powerful candidate competing with the electronic ink technology by virtue of its potential advantages of fast response, bistable state (the display state can be maintained under no electric field), and more excellent reflection brightness and color saturation. The realization of colorization is a key direction of the technical development of electronic paper, and currently, the color cholesteric liquid crystal display screen on the market mainly adopts an RGB three-cell stacking scheme, namely, three cholesteric liquid crystals reflecting red light, green light and blue light are respectively manufactured and then vertically stacked. The scheme can realize full-color display, but has the inherent serious defects of high manufacturing cost of ①, complex process and high yield challenge due to the fact that three independent cell manufacturing processes and materials are needed, the ② equipment is thick and heavy, the thickness and the weight of a display screen are obviously increased due to a three-layer structure, the light and thin design of terminal equipment is not facilitated, the ③ optical efficiency is low, light rays need to penetrate through a multi-layer structure, light loss is caused by each layer, and the overall brightness and color performance are reduced. In the related art, a single cell color cholesteric liquid crystal scheme is proposed, that is, in one liquid crystal cell, cholesteric liquid crystal materials of three colors of red, green and blue are respectively filled into corresponding sub-pixels. However, after the liquid crystal material is filled, the liquid crystal material is driven by capillary force generated by a tiny gap at the upper substrate to generate lateral movement and diffusion, so that adjacent sub-pixels are mixed in color, and the purity and quality of a display picture are damaged. In addition, in the related art, in order to prevent the cholesteric liquid crystal from flowing, the spiral structure of the cholesteric liquid crystal is easily excessively divided and disturbed, and the reflection area is sacrificed, so that the reflectivity is reduced, the haze is increased, and the display requirement of the electronic paper cannot be met. Disclosure of Invention The application mainly provides a preparation method of a display panel and the display panel, which are used for solving the problems that cholesteric liquid crystal of the electronic paper display panel in the related art is easy to move and diffuse to cause adjacent sub-pixel color mixing, and the spiral structure of the cholesteric liquid crystal is divided and disordered to cause the reflectivity to be reduced so as to influence the picture display effect. In order to solve the technical problems, the application adopts a technical scheme that the preparation method of the display panel comprises the following steps: preparing at least three curable cholesteric liquid crystal compositions, wherein each of the curable cholesteric liquid crystal compositions comprises a curable component, a curing initiator, and one cholesteric liquid crystal; The manufacturing method comprises the steps of providing a first substrate, wherein the first substrate comprises a first substrate, a driving circuit layer, a first electrode layer and a retaining wall layer which are sequentially stacked, the retaining wall layer comprises a plurality of retaining walls, and a plurality of pixel accommodating areas are formed by surrounding the retaining walls; Injecting at least three of said curable cholesteric liquid crystal compositions into a plurality of said pixel-receiving areas using an inkjet printing process, each of said pixel-receiving areas being injected with one of said curable cholesteric liquid crystal compositions; Curing the curable cholesteric liquid crystal composition within the pixel-receiving area to cure the curable component to form a thin film coating that encapsulates the cholesteric liquid crystal to form cholesteric liquid crystal capsules; and providing a second substrate, attaching and packaging the second substrate and the first substrate, wherein the second substrate covers and seals the pixel accommodating area. In some embodiments, the step of preparing at least three curable cholesteric liquid crystal compositions specifically includes: Providing three groups of same nematic liquid crystal matrixes, adding chiral dopants