Display Panel Gate Driver Voltage Differential for Brightness Uniformity
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Solution Overview
Problem
Half-source driver technology in display panels results in bright and dark lines in a vertical direction due to differences in charging voltages across adjacent subpixels caused by polarity inversion, leading to uneven brightness.
Innovation Solution
The display panel employs a configuration where the voltage of the gate enabling signal for one column of subpixels is greater than that of an adjacent column, with opposite polarities and chamfered waveforms for the gate enabling signals, allowing faster charging and reducing voltage differences between subpixels, thus eliminating bright and dark lines without requiring design changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If half-source driver is used to reduce driver chip cost, then source driver integrated chips are saved by half, but bright and dark lines appear in vertical direction due to voltage differences
Solution Approach 1:
The patent applies local quality by differentiating gate driving signals for different column types. Odd-column subpixels receive one set of gate driving signals while even-column subpixels receive another set with different voltage characteristics. This local differentiation compensates for the voltage differences caused by polarity inversion in half-source driver, eliminating bright and dark lines while maintaining the cost advantage of reduced driver chips.
2Speed
If gate enabling signal voltage is increased for first column subpixels, then charging speed increases and brightness uniformity improves, but power consumption increases
Solution Approach 1:
The patent implements periodic action by alternating gate driving signal patterns between adjacent rows. In odd rows, odd-column subpixels receive higher voltage gate enabling signals while even-column subpixels receive lower voltage signals. In even rows, this pattern is inverted. This periodic alternation ensures that each column type receives high voltage charging opportunities periodically, maintaining charging speed and brightness uniformity while distributing power consumption across time, thereby reducing average power consumption compared to continuously applying high voltage.
Data Source
AI summary
This application discloses a display panel, a driving method thereof and a display apparatus. The display panel includes a substrate, the substrate being provided with a plurality of data lines, a plurality of gate lines, and a plurality of pixel units; and a gate driver chip, where each pixel unit includes subpixels of different colors; the gate driver chip outputs gate enabling signals to the gate lines to turn on the pixel units; and each row of pixel units includes a plurality of pixel groups, each pixel group includes a first column of subpixels and a second column of subpixels and a voltage of a gate enabling signal of the first column of subpixels is greater than that of a gate enabling signal corresponding to the second column of subpixels.