Liquid Crystal Display Sub-Pixel Electrode Connection Structure
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Solution Overview
Problem
Conventional time-division drive type liquid crystal display devices face high design costs and luminance degradation due to the need for significant design changes when transitioning from driving three gate lines simultaneously to driving them one by one, and simply connecting sub-pixel electrodes together disrupts liquid crystal alignment directions.
Innovation Solution
A liquid crystal display device with sub-pixel electrodes connected by interelectrode connection portions at specific positions where liquid crystal alignment boundaries meet, maintaining alignment and reducing design costs by using a conventional TFT substrate design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If three sub-pixel electrodes are connected together to form one pixel electrode, then design cost is reduced, but liquid crystal alignment directions are largely changed causing luminance degradation and display failure
Solution Approach 1:
The patent applies local quality by making different parts of the pixel electrode have different properties. Specifically, the pixel electrode is divided into a first region and a second region with different liquid crystal alignment directions. The interelectrode connection portion is positioned in the first region where the alignment direction is substantially the same as in the connected sub-pixel electrodes, while the second region has a different alignment direction. This local differentiation allows the connection to be made without disrupting the overall liquid crystal alignment, thus reducing design cost while preventing luminance degradation and display failure.
2Productivity
If gate driver drives three gate lines at the same time, then productivity is improved, but design complexity increases requiring large design changes and new masks
Solution Approach 1:
The patent applies universality by making the pixel electrode design compatible with both single-line and multi-line gate driving modes. The pixel electrode structure with regions of different alignment directions can work with conventional single-line scanning or with parallel multi-line scanning. This allows the same design to be used for both productivity improvement (parallel scanning) and conventional operation, avoiding the need for new masks and reducing design complexity while maintaining high writing speed capability.
Data Source
AI summary
A liquid crystal display device includes sub-pixel electrodes respectively provided to three sub-pixels, and an interelectrode connection portion that connects sub-pixel electrodes adjacent to each other among the sub-pixel electrodes. The interelectrode connection portion is provided in a position where boundaries of liquid crystal alignment directions of sub-pixels adjacent to each other are connected.