Liquid Crystal Display Pixel Contact Hole Sharing for Blue Luminance
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving high luminance and low power consumption, particularly with blue pixels having insufficient luminance due to smaller display-contributing areas.
Innovation Solution
The liquid crystal display device incorporates a matrix arrangement of pixels with alternating color assignments, where switching devices for two colors share a contact hole connected to the source line, and semiconductor layers with a J-shape extending to intersect gate lines, optimizing the aperture ratio and reducing the number of contact structures to increase the display-contributing area of pixels with lower luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If blue pixels are enlarged to increase display-contributing area, then luminance of blue pixels is improved, but device complexity and manufacturing difficulty increase due to non-uniform pixel structure
Solution Approach 1:
The patent merges the contact holes of two adjacent pixels (one blue pixel and one white pixel) into a single shared contact hole. This allows the blue pixel to have a larger aperture ratio and display-contributing area without requiring separate contact structures, thus improving luminance while avoiding increased device complexity. The shared contact hole is positioned such that it serves both pixels simultaneously, eliminating the need for additional contact holes that would complicate the device structure.
2Reliability
If more contact holes are provided for each pixel, then electrical connection reliability is improved, but aperture ratio and display-contributing area decrease
Solution Approach 1:
The patent combines the contact holes of adjacent pixels into a shared contact hole structure. This single shared contact hole provides electrical connection for both the blue pixel and the white pixel, maintaining reliability while maximizing the display-contributing area. By eliminating redundant contact holes, the aperture ratio is increased, allowing more light to pass through to the liquid crystal layer.
Solution Approach 2:
The shared contact hole serves multiple functions: it provides electrical connection for both the blue pixel and the white pixel simultaneously. This multi-functional design reduces the total number of contact holes required, thereby increasing the overall aperture ratio and display-contributing area while maintaining reliable electrical connections for all pixels.
3Illumination intensity
If pixel aperture ratio is increased to improve luminance, then display quality is improved, but light leakage increases and power consumption rises
Solution Approach 1:
The patent merges contact holes into a shared structure that maintains precise electrical connections while reducing the total contact hole area. This allows the pixel aperture ratio to be effectively increased for better luminance, while the shared contact structure minimizes light leakage paths. The result is improved display quality without proportionally increasing power consumption.
Data Source
AI summary
To provide a liquid crystal display device including a plurality of gate lines extending in a first direction; a plurality of source lines extending in a second direction; and a plurality of pixel areas each surrounded by the gate line and the source line, and arranged in a matrix, wherein each of the pixel areas includes a switching device connected through a contact hole to the source line, each of the plurality of pixel areas is assigned any of at least four colors, two colors out of the four colors are alternately arranged in a same column of the pixel areas, and the switching devices in the respective pixel areas for the two colors alternately arranged share the contact hole connected to the source line.