LCD Sub-pixel Wiring and Staged Scanning for Uniform Brightness
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Solution Overview
Problem
Liquid crystal displays (LCDs) with a reduced number of data lines suffer from non-uniform brightness and the line mura effect due to time differences when charging sub-pixels in the same row, which affects the image quality, especially since green is the most sensitive color to human eyes.
Innovation Solution
The configuration of LCDs where two color sub-pixels in the same row share a data line but are connected to different scan lines, ensuring that green sub-pixels are charged last, thereby minimizing the impact of other colors on their luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of data lines is reduced, then the thickness and cost of the display are reduced, but the brightness uniformity deteriorates and line mura effect occurs
Solution Approach 1:
The patent segments the scanning process into multiple stages by dividing the gate lines into different scanning groups. Sub-pixels coupled to different gate lines are scanned in different stages, ensuring that charging operations are completed sequentially without mutual interference. This segmentation resolves the conflict between reduced data lines and brightness uniformity by eliminating the timing conflicts that cause line mura effect.
Solution Approach 2:
The patent implements preliminary action by completing the charging of sub-pixels on different gate lines in sequential stages before finalizing the display frame. The first stage charges sub-pixels on odd gate lines, and the second stage charges sub-pixels on even gate lines. This preliminary staged charging ensures that no sub-pixel charging interferes with another, preventing brightness non-uniformity while maintaining the reduced data line structure.
2Device complexity
If sub-pixels in the same row are coupled to different gate lines to reduce data lines, then the number of data lines is reduced, but time differences in charging occur causing line mura effect
Solution Approach 1:
The scanning process is segmented into multiple stages based on gate line groups. Sub-pixels are charged in sequential stages rather than simultaneously, eliminating time differences in charging. The first scanning stage handles odd gate lines while the second scanning stage handles even gate lines, ensuring that charging operations are time-separated and do not cause mutual interference or line mura effect.
Solution Approach 2:
The patent performs preliminary charging actions in a staged manner. Before completing a full frame, the system first charges sub-pixels on odd gate lines, then subsequently charges sub-pixels on even gate lines. This preliminary staged approach ensures that all charging operations are completed in a controlled sequence, eliminating timing conflicts that would otherwise cause brightness non-uniformity.
3Productivity
If green sub-pixels are charged simultaneously with other colors, then the charging process is efficient, but the line mura effect is exacerbated since green is the most sensitive color to human eyes
Solution Approach 1:
The charging process is segmented into color-sequential stages. Green sub-pixels are charged in a dedicated stage after red and blue sub-pixels have been charged. This segmentation ensures that green sub-pixels are not charged simultaneously with other colors, preventing the line mura effect from affecting the most visually sensitive color while maintaining overall charging efficiency through systematic sequencing.
Solution Approach 2:
The patent implements preliminary charging of red and blue sub-pixels before charging green sub-pixels. This preliminary action ensures that when green sub-pixels are charged, the other color sub-pixels are already stabilized, preventing mutual interference and line mura effect on the most sensitive green color. The sequential staging maintains productivity by systematically progressing through all color sub-pixels without idle time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration maintains consistent brightness across the display, reducing the line mura effect and ensuring that the most sensitive color, green, is not adversely affected, while also halving the number of data lines.
Implementation Method 1
When driving an LCD, a voltage difference is imposed at both ends of the liquid crystal layer to change the arrangement of liquid crystals so as to change the transmittance rate of the liquid crystal layer and to display an image.
Data Source
AI summary
A display includes a plurality of pixels, a plurality of scan lines and a plurality of data lines. Each pixel includes a first color sub-pixel, a second color sub-pixel and a third color sub-pixel. The scan lines and the data lines are coupled to the pixels. Two color sub-pixels in the same row coupled to the same data line are coupled to different scan lines, and all of the second color sub-pixels in the same row are coupled to the same scan line.