Source Driver Timing for Uniform Charging in Large Displays
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Solution Overview
Problem
Large-size display devices, particularly those with low charging rates such as Dualgate, high-refresh-rate, and 8K-resolution types, suffer from uneven brightness in vertical regions (V-Block) due to ineffective compensation methods like Fanout resistance and GDE/PPCC, leading to poor user experience.
Innovation Solution
A display device with a source driver configured to set different data transmission start times for data lines intersecting the same gate line, ensuring equal effective charging time for sub-pixels by adjusting the timing of data signal transmission based on their proximity to the gate driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Fanout resistance compensation or GDE/PPCC compensation is used, then charging compensation is attempted, but V-Block problem cannot be effectively solved
Solution Approach 1:
The source driver performs preliminary action by adjusting the data transmission start time for each data line before the gate signal is applied. This ensures that data signals are transmitted to sub-pixels at different times based on their position, so that sub-pixels farther from the gate driver receive data earlier, compensating for the longer charging time they would otherwise experience. This preliminary timing adjustment resolves the V-Block problem by ensuring uniform effective charging time across all sub-pixels.
2Manufacturing precision
If data transmission start time is adjusted for different data lines, then effective charging time becomes equal, but device complexity increases
Solution Approach 1:
The source driver applies local quality by treating different data lines differently based on their specific characteristics and positions. Each data line receives a customized data transmission start time adjusted according to the sub-pixels it connects and their distance from the gate driver. This localized timing adjustment ensures that each region of the display panel receives appropriate charging compensation, achieving uniform effective charging time without requiring a complete redesign of the driver architecture.
Data Source
AI summary
A display device includes a display panel including a plurality of gate lines and a plurality of data lines, the plurality of gate lines intersecting and being insulated with the plurality of data lines, the display panel further including a plurality of sub-pixels arranged in an array, and the plurality of gate lines and the plurality of data lines defining areas where the sub-pixels are located; a gate driver electrically connected to the plurality of gate lines in the display panel; and a source driver bound to the display panel and electrically connected to the plurality of data lines in the display panel, the source driver being configured to set data transmission start time for respective data lines so that effective charging time of respective sub-pixels formed by the plurality of data lines and a same gate line is same.