Display Device Aperture Shape Uniformity
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Solution Overview
Problem
In double scanline style liquid crystal displays, the varying position of TFTs from column to column leads to luminance nonuniformity and reduced display quality due to changing aperture area shapes, causing visible streaks and reduced color reproducibility.
Innovation Solution
A display device with a matrix of pixels featuring two or more positions for the switching device common in each column, a light-shielding film with uniform aperture areas, and colorants arranged in a repeating pattern across columns, ensuring consistent aperture shapes for improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the position of TFT varies from column to column in double scanline style, then the number of video signal lines per pixel is reduced by half, but luminance nonuniformity and display quality are reduced due to changing aperture area shapes
Solution Approach 1:
The patent applies local quality by making the aperture area shape position-dependent on the column number. Specifically, aperture areas in odd-numbered columns have a first shape while aperture areas in even-numbered columns have a second shape, allowing each column to be optimized for its specific TFT position while maintaining overall display quality
Solution Approach 2:
The patent implements periodic action by repeating the pattern of aperture area shapes every two columns. The aperture area shapes alternate periodically between first and second shapes corresponding to odd and even columns, creating a regular pattern that maintains luminance uniformity across the display
2Device complexity
If the position of TFT varies from column to column, then cost is reduced by fewer video signal lines, but color reproducibility is reduced due to varying aperture area shapes
Solution Approach 1:
The patent applies local quality by positioning colorants specifically within aperture areas of particular shapes. Colorants are placed in aperture areas with the first shape in odd columns and in aperture areas with the second shape in even columns, ensuring consistent color reproduction despite varying aperture shapes
Solution Approach 2:
The patent implements periodic action by repeating the colorant placement pattern every two columns. The colorant positions and aperture area shapes alternate periodically, ensuring that color reproducibility is maintained across all columns despite the varying local aperture shapes
Data Source
AI summary
The display device according to the present invention has a pixel, a TFT, a BM, and a colorant. A plurality of pixels are arranged in a matrix. The TFT is placed in the pixel. There are two kinds of positions of the TFT in the pixel. The position is common in each column. The BM has an aperture area and a TFT light-shielding part in the pixel. The TFT light-shielding part is placed to counter the TFT. The colorant is placed in the aperture area. Further, there are two or more kinds of the colors of the colorant. The color is common in each column. The shapes of the aperture areas in which the same color colorants are placed are the same.