Overlapping LCD Panels with Shared Source Lines
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Solution Overview
Problem
In liquid crystal display devices where multiple display panels overlap, defective pixels on a black-and-white image panel can cause significant distortion in the overlapping color image pixels, leading to image degradation.
Innovation Solution
The implementation of a liquid crystal display device with a first display panel and a second display panel, where each panel includes thin film transistors and pixel electrodes connected to source and gate lines, with specific configurations of thin film transistors and pixel electrodes allowing for overlapping pixel groups to share source and gate lines, enabling proper operation even if one pixel is defective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one pixel of the black-and-white image display panel is defective, then the pixel cannot display correctly, but multiple color pixels (up to 27 pixels) overlapping with it become distorted
Solution Approach 1:
The invention divides the pixel structure into two independent panels: a color image display panel with color pixels and a black-and-white image display panel with grayscale pixels. Each panel has its own pixel electrodes and thin film transistors, creating independent display units. This segmentation ensures that a defective pixel in one panel does not cause distortion in pixels of the other panel, as the electrical circuits are separated. The color pixels and grayscale pixels operate independently, eliminating the harmful effect where one defective pixel could distort multiple overlapping pixels.
Solution Approach 2:
The invention introduces an optical combining layer (such as a beam splitter or dichroic mirror) as an intermediary between the two display panels. This intermediary optically combines the images from the color panel and grayscale panel while maintaining electrical independence. The optical intermediary allows the two panels to work together to produce the final display image without their electrical circuits interfering with each other, thus preventing defect propagation.
2Illumination intensity
If multiple display panels overlap to improve contrast, then contrast ratio is improved, but the complexity of the display structure increases
Solution Approach 1:
The invention merges two display panels (color image panel and grayscale panel) into a single integrated display device with overlapping structures. The panels are positioned at specific angles relative to each other and optically combined to achieve high contrast ratio. This merging approach allows the system to benefit from both color and grayscale display capabilities while maintaining a compact form factor, as the panels share the same physical space rather than requiring separate display units.
Solution Approach 2:
The invention utilizes the third dimension (depth/layering) by stacking display panels at different positions and angles. Instead of placing panels side-by-side in the same plane, the panels are arranged in overlapping layers with specific angular relationships. This dimensional arrangement allows optical combination while maintaining electrical independence, effectively using spatial dimensionality to resolve the contradiction between improved contrast and increased complexity.
Data Source
AI summary
A liquid crystal display device includes: a first display panel; and a second display panel opposing to the first display panel. Each of the first and second display panel includes a plurality of source lines, a plurality of gate lines, a plurality of thin film transistors, and a plurality of pixel electrodes electrically connected to corresponding one of the thin film transistors. In a second display panel, at least two thin film transistors are electrically connected to a same second source line and a same second gate line.