Liquid Crystal Display Common Electrode Bridge Segmentation
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Solution Overview
Problem
The challenge is to develop a liquid crystal display device with a large screen that achieves a high resolution while minimizing the increase in resistance of the common electrode, particularly as pixel pitch decreases.
Innovation Solution
The solution involves a liquid crystal display device design where a bridge formed by metal wiring connects common electrodes, covering specific video signal lines without others, and using a connection ITO to cover through holes while ensuring insulation from common electrodes, thereby reducing pixel pitch and common electrode resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel pitch is reduced to increase resolution, then the display resolution is improved, but the common electrode resistance increases
Solution Approach 1:
The common electrode is divided into multiple segments connected by bridges, allowing the electrode structure to be optimized for both low resistance and small pixel pitch without requiring a single continuous electrode across the entire display area
Solution Approach 2:
The bridge structure extends the common electrode connection in a direction perpendicular to the pixel rows, utilizing the vertical dimension to connect common electrodes without increasing the horizontal pixel pitch, thereby reducing resistance without compromising resolution
2Ease of manufacture
If the through hole diameter is increased to connect TFT and pixel electrode, then the manufacturing ease is improved, but the pixel pitch reduction is limited
Solution Approach 1:
The insulating film thickness is varied locally - thicker in regions where through holes are formed to ensure proper connection, and thinner in other regions to allow for smaller pixel pitch, optimizing both manufacturing and resolution requirements
Solution Approach 2:
The insulating film serves as an intermediary layer that is strategically thickened only where needed for through hole formation, allowing the pixel electrode and TFT to be connected with adequate insulation while maintaining overall small pixel dimensions
Data Source
AI summary
The liquid crystal display device includes: a TFT substrate including scanning lines extending in a first direction and being arranged in a second direction, video signal lines extending in the second direction and being arranged in the first direction, pixel electrodes arranged in regions surrounded by the scanning lines and the video signal lines, and common electrodes formed with an insulating film arranged between the common electrodes and the pixel electrodes; a counter substrate opposed to the TFT substrate; and a liquid crystal. The first common electrode extends between the first and second scanning lines in the first direction, and the second common electrode extends between the second and third scanning lines in the first direction. The first and second common electrodes are electrically connected by a bridge. The bridge covers the first video signal line without covering the second video signal line, when seen in a plan view.