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Alignment film, preparation method thereof, display substrate and display device

An alignment film and base material technology, which is applied in the fields of display devices, its preparation, display substrates, and alignment films, can solve problems such as bright spots and gypsophila dots, alignment film scratches, and poor panel images, so as to reduce bright spots and the effect on the incidence of Gypsophila punctate

Active Publication Date: 2018-06-12
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the alignment film is directly in contact with the liquid crystal and determines the alignment of the liquid crystal in the state of no electric field, foreign objects appear on the surface of the alignment film or the alignment of the alignment film is abnormal, which will directly lead to poor panel images.
[0005] Usually, during the process of assembly, transportation or polishing, the color filter substrate and the thin film transistor substrate are easily subjected to external forces to cause relative friction, and then the alignment film is scratched and the alignment film debris is generated.
The generated alignment film debris moves outward to the area that cannot be blocked by the black matrix, and will form bright spots and starry sky (zara) spot defects, which directly affect the display effect

Method used

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  • Alignment film, preparation method thereof, display substrate and display device
  • Alignment film, preparation method thereof, display substrate and display device
  • Alignment film, preparation method thereof, display substrate and display device

Examples

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preparation example Construction

[0048] The embodiment of the present invention also discloses a method for preparing an alignment film, which includes the following steps:

[0049] The microcapsules and the catalyst are mixed into the solution containing the substrate intermediate, and after curing, an alignment film is obtained;

[0050] The microcapsule contains a first monomer, and the catalyst can catalyze the polymerization reaction of the first monomer.

[0051] In an embodiment of the present invention, the microcapsules and the catalyst are added to the solution containing the substrate intermediate. For the selection of the microcapsules and catalyst, refer to the above-mentioned technical solutions, and details are not repeated here.

[0052] The substrate intermediate refers to an intermediate produced during the preparation of the substrate, and the substrate is obtained after the intermediate is cured. For example, the substrate is polyimide, and the substrate intermediate is polyamic acid.

...

Embodiment 1

[0076] Divinylbenzene is mixed with an appropriate amount of deionized water, and the mixture is uniformly dispersed under high-speed dispersion conditions, and divinylbenzene exists in the mixed liquid in the state of uniform droplets;

[0077] In the mixed liquid, add BPO (free radical initiator), formaldehyde solution (mass concentration of formaldehyde is 37% to 40%) and urea, formaldehyde and urea are polymerized with divinylbenzene droplets as the core to form urea-formaldehyde resin Emulsion of microcapsules wrapped in divinylbenzene;

[0078] Use urea-formaldehyde resin-wrapped divinylbenzene microcapsule emulsion as the polymerization seed, add dibasic anhydride, diamine and silane coupling agent to dissolve in organic solvent, carry out polymerization reaction, heat to 50-80°C, and continue the reaction for 2- After 4 hours, polyimide was wrapped in the outer layer of phenolic resin to form a microcapsule emulsion with double-wall structure;

[0079] The microcapsul...

Embodiment 2～4

[0087] With the raw materials described in Table 2, the microcapsules were prepared. The microcapsules and the catalyst are doped in the polyamido acid solution, and coated on the substrate by a spin-coating coating process, with a thickness of The curing process is divided into pre-curing and main curing. The pre-curing temperature is 100-180°C, the pre-curing time is 50s-200s, the main curing temperature is 200-280°C, and the main curing time is 500-2000s. After curing, polyimide is obtained. The alignment film of the substrate.

[0088] In the alignment film, the mass of the microcapsule accounts for 5wt% of the mass of the polyimide substrate, the mass of the catalyst accounts for 0.3wt% of the mass of the polyimide substrate, and the alignment film.

[0089] Table 2

[0090]

[0091] A scratch test was performed on the alignment films prepared in Examples 2-4, and no obvious debris was generated.

[0092] The alignment films prepared in Examples 2-4 were used to pr...

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Abstract

The invention relates to the field of display, in particular to an alignment film, a preparation method thereof, a display substrate and a display device. The alignment film made of a base material comprises microcapsules and catalysts doped into the base material and is characterized in that first monomers are contained in the microcapsules; the catalysts can catalyze the first monomers to have polymerization reaction. The alignment film has the advantages that when the alignment film is scratched, the microcapsules in the alignment film break, the first monomers are released and have polymerization reaction under the effect of the catalysts to form polymer, the polymer wraps and fixes alignment film scraps to prevent the generation and movement of the alignment film scraps and prevent the alignment film scraps from entering a liquid crystal box, and the occurrence rate of undesirable conditions of bright spots and starry spots is lowered.

Description

technical field [0001] The invention relates to the display field, in particular to an alignment film, a preparation method thereof, a display substrate, and a display device. Background technique [0002] TFT-LCD (Thin Film Transistor-Liquid Crystal Display) thin film transistor liquid crystal display is currently the most mainstream display on the market and has been fully popularized. [0003] The TFT-LCD includes a color filter (CF) substrate, a thin film transistor (TFT) substrate, a liquid crystal layer arranged between the two substrates, and spacers supporting the cell thickness between the two substrates. The change of the electrical signal on the TFT can control the rotation direction of the liquid crystal molecules, thereby controlling whether the polarized light of each pixel is emitted or not to display a color picture. [0004] The alignment film is the part on the TFT and CF substrates that is directly in contact with the liquid crystal. Its function is to ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
CPCG02F1/133711G02F1/133723
Inventor 绪浩舒
Owner BOE TECH GRP CO LTD
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