PSVA Display Panel Black Matrix Layout for Dark Strip Control
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Solution Overview
Problem
Polymer stabilized vertical alignment (PSVA) liquid crystal display technology experiences a low penetration rate due to weak electric fields in peripheral regions of pixel electrodes, causing rotations with different angles and the formation of dark strips, which reduces the display panel's performance.
Innovation Solution
The display panel incorporates a liquid crystal layer with chiral auxiliary reagents and black matrices positioned between pixel electrodes, with the black matrices covering opaque and dark strip regions to adjust their positions and increase the display area, thereby enhancing the penetration rate. This is achieved by strategically disposing black matrices and pixel electrodes, including cross-shaped and obliquely-disposed electrode configurations, and using chiral auxiliary reagents to control liquid crystal rotations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chiral auxiliary reagents are added to liquid crystal layers to form pretilt angles, then liquid crystal rotation is achieved, but dark strips are formed in peripheral regions due to weak electric fields, reducing penetration rate
Solution Approach 1:
The patent converts the harmful dark strip regions into beneficial areas by strategically positioning black matrices to cover them. The black matrices, which would normally be considered space-consuming elements, are instead used to mask the peripheral dark strip defects caused by weak electric fields, transforming a harmful visual artifact into a controlled design feature that improves overall display uniformity and penetration rate
Solution Approach 2:
The patent applies different properties to different regions of the pixel electrode structure. By positioning black matrices specifically in peripheral regions where dark strips form due to weak electric fields, the solution addresses the local quality issue of non-uniform liquid crystal rotation without affecting the central region performance. This localized approach allows the majority of the pixel area to maintain optimal liquid crystal alignment while compensating for edge effects
2Reliability
If black matrices are added to cover dark strip regions, then display uniformity is improved, but pixel electrode area is reduced
Solution Approach 1:
The patent applies partial action by positioning black matrices only in the specific peripheral regions where dark strip defects occur, rather than covering the entire pixel electrode area. This selective placement strategy covers only the necessary areas to achieve display uniformity while preserving the maximum possible pixel electrode area for light transmission, thus avoiding excessive action that would unnecessarily reduce the display area
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
The solution effectively improves the penetration rate of PSVA-type liquid crystal displays by optimizing the alignment and coverage of dark strip regions, increasing the display area and enhancing overall performance.
Implementation Method 1
a plurality of dark strip regions are formed at part of edges of the plurality of pixel electrodes due to the chiral auxiliary reagent causing different rotational directions of the plurality of liquid crystal molecules
Data Source
AI summary
A display panel is provided. The display panel includes pixel electrodes, and black matrices located between adjacent pixel electrodes. Opaque regions are formed between the pixel electrodes. Dark strip regions are formed at part of edges of pixel electrodes. The black matrices cover the opaque regions and the dark strip regions. The provided display panel increases an area of a display region by oppositely disposing the black matrices and the pixel electrodes.