Display Panel Pixel Switch Channel Ratio for Brightness Balance
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Solution Overview
Problem
Backlight-type LCDs often suffer from vertical bright and dark lines due to differences in charging voltages between adjacent pixels, caused by the Half-Source Driver scheme, which affects brightness balance.
Innovation Solution
A display panel design where each row of pixels includes adjacent pixel groups connected to the same data line but different gate lines, with opposite polarity data drive signals, and a larger channel width-to-length ratio for the second column pixel's active switch, ensuring stronger charging capability and equalizing charging voltages between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the Half-Source Driver scheme is used to reduce source driver integrated chips, then the number of source driver chips is reduced by half, but vertical bright and dark lines appear due to charging voltage differences between adjacent pixels
Solution Approach 1:
The patent applies local quality by setting different channel width-to-length ratios for active switches in different column groups. Specifically, pixel groups in even columns have a larger channel width-to-length ratio than those in odd columns, creating local differences in charging capability that compensate for the voltage drop caused by shared data lines, thereby eliminating vertical bright and dark lines while maintaining the cost benefits of the Half-Source Driver scheme
Solution Approach 2:
The patent changes the parameter of channel width-to-length ratio to resolve the contradiction. By adjusting this parameter differently for even and odd column groups, the patent compensates for the charging voltage differences caused by the Half-Source Driver configuration, achieving uniform brightness across all pixels while maintaining the reduced driver chip architecture
2Device complexity
If adjacent pixel groups share the same data line to reduce data lines, then the number of data lines is reduced, but charging voltage differences cause vertical bright and dark lines
Solution Approach 1:
The patent introduces local quality differences in the active switch parameters within different column groups connected to the same data line. Even column groups have larger channel width-to-length ratios compared to odd column groups, creating compensatory charging capabilities that offset the voltage drop along the shared data line, thus achieving uniform brightness while maintaining reduced data line complexity
Solution Approach 2:
The patent applies asymmetry by treating even and odd column groups differently through unequal channel width-to-length ratios. This asymmetric design compensates for the symmetric problem of voltage drop in shared data lines, ensuring that pixels in even columns receive additional charging capability to match the brightness of pixels in odd columns
Data Source
AI summary
This application discloses a display panel and a display apparatus. The display panel includes a substrate on which data lines, gate lines, pixels, and a gate driver chip are arranged, where the gate driver chip outputs gate enable signals to the gate lines to turn on the pixels; each row of pixels include a plurality of pixel groups, each of the pixel groups includes a first column of pixel and a second column of pixel, the first column of pixel and the second column of pixel are connected to the same data line, and the first column of pixel and the second column of pixel are connected to two different gate lines; and the channel width-to-length ratio of an active switch corresponding to the second column of pixel is greater than that corresponding to the first column of pixel.