Photo Alignment Liquid Crystal Display Panel Manufacturing
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Solution Overview
Problem
The existing methods for manufacturing liquid crystal display panels using rubbing alignment techniques face issues such as broken TFT elements due to static electricity and display failures caused by dust, which reduce manufacturing yield and display quality.
Innovation Solution
The implementation of a photo alignment treatment using linearly polarized light to control the alignment of liquid crystal molecules without rubbing, combined with a sealing material with a controlled volume shrinkage ratio to enhance adhesive strength between substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubbing alignment method is used, then alignment of liquid crystal molecules is achieved, but static electricity generates causing element breakage and dust generates causing display failure
Solution Approach 1:
The patent replaces the mechanical rubbing method with a photoalignment method using linearly polarized light. Instead of physically rubbing the alignment film with a cloth or roller, the invention uses optical fields to induce molecular alignment in the alignment film, thereby eliminating mechanical contact that generates static electricity and dust. This substitution of mechanical action with optical action directly resolves the harmful effects while maintaining the alignment function.
Solution Approach 2:
The invention changes the fundamental parameter of the alignment process from mechanical force (rubbing) to optical field parameters (polarized light wavelength, intensity, and polarization direction). By controlling these optical parameters, the alignment film undergoes photo-induced molecular reorientation without mechanical contact, thus eliminating static electricity generation and dust contamination while achieving the desired liquid crystal alignment.
2Reliability
If photo alignment treatment is used, then rubbing-related problems are eliminated, but adhesive strength between substrates may be affected
Solution Approach 1:
The invention addresses the adhesive strength issue by optimizing parameters of the sealing material, specifically its volume shrinkage ratio. By controlling the volume shrinkage ratio to satisfy B≤2000/A (where A is width in μm and B is volume shrinkage ratio in %), the patent ensures adequate adhesive strength is maintained even when using photoalignment instead of rubbing. This parameter optimization compensates for any potential adhesion issues arising from the alignment method change.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the production of liquid crystal display panels with higher yield and quality by eliminating the need for rubbing, preventing display failures, and improving the adhesive strength between substrates, resulting in more reliable and efficient manufacturing.
Implementation Method 1
The photo alignment treatment can be carried out by radiating linearly polarized light onto an alignment film. Thereby, the alignment film subjected to the photo alignment treatment can control initial alignment of liquid crystal molecules.
Implementation Method 2
bonding the array substrate and the counter-substrate to each other with a sealing material
Data Source
AI summary
According to one embodiment, there is provided a method of manufacturing a liquid crystal display panel, which includes preparing a pair of substrates including respective alignment films formed therein and subjected to photo alignment treatment, providing a sealing material on a frame area of the alignment film of one of the pair of substrates, and bonding the pair of substrates to each other with the sealing material, and curing the sealing material to form a sealing member, and forming a liquid crystal layer in space surrounded by the pair of substrates and the sealing member. The sealing material satisfies the following formula B≦2000 [μm]/A.