Display Driving Method Timing Advance for Far-End Sub-Pixel Charging
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Solution Overview
Problem
In high-frame-rate display panels, far-end sub-pixel units experience insufficient data charging time due to voltage drop, leading to data delay and reduced charging rates compared to near-end sub-pixel units.
Innovation Solution
A display driving method where the source driver outputs data signals with specific timing differences between active pulse signals and gate drive signals, ensuring that far-end sub-pixel units receive data earlier than near-end sub-pixel units, thereby compensating for data delay and improving charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frame rate of the display panel is increased, then the display performance is improved, but the charging time of each sub-pixel unit becomes shorter
Solution Approach 1:
The patent applies preliminary action by outputting the data signal in advance before the gate drive signal. Specifically, the data signal is output at a starting point that is earlier than the starting point of the gate drive signal, creating a time advance that compensates for the reduced charging time at high frame rates. This allows the sub-pixel unit to begin charging earlier, effectively extending the charging duration despite the shorter frame period.
Solution Approach 2:
The patent changes the timing parameter of the data signal output. By adjusting the time difference (time advance) between the data signal and gate drive signal, the charging characteristics are optimized. The time advance is set within a specific range (0.1-0.5 microseconds) to achieve optimal charging effect while maintaining high frame rate operation.
2Device complexity
If the data signal is output at the same timing for all rows, then the control is simple, but the far-end sub-pixel units experience insufficient charging time due to voltage drop
Solution Approach 1:
The patent applies local quality by making the data signal output timing row-dependent. Different rows are assigned different time advances, with rows farther from the source driver receiving larger time advances. This localizes the timing adjustment to compensate for the cumulative voltage drop effect, ensuring each row receives adequate charging time according to its specific position and electrical characteristics.
3Duration of action of moving object
If the time advance is increased to compensate for far-end sub-pixel charging, then the charging time is improved, but the timing synchronization becomes more complex
Solution Approach 1:
The patent optimizes the time advance parameter within a specific range (0.1-0.5 microseconds) to achieve the best balance between charging effectiveness and timing control simplicity. This parameter optimization ensures sufficient charging time for far-end sub-pixels while maintaining manageable timing control complexity. The standardized parameter range facilitates implementation without requiring complex timing calculations.
Data Source
AI summary
A display driving method includes: controlling a source driver to output a data signal, wherein the data signal comprises a plurality of first active pulse signals, the first active pulse signal in the Nth row is for driving a sub-pixel unit in the Nth row, and a timing difference between a starting point of the first active pulse signal in the Nth row and a starting point of a corresponding gate drive signal is smaller than a timing difference between a starting point of the first active pulse signal in the (N+M)th row and a starting point of a corresponding gate drive signal; and wherein the sub-pixel unit in the Nth row is closer to the source driver than the sub-pixel unit in the (N+M)th row, and N and M are positive integers greater than or equal to 1.