Source Driver Timing Compensation for Display Luminance Uniformity
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Solution Overview
Problem
Luminance non-uniformity occurs between the edge and center portions of a display panel due to delay deviations in the gate signal, leading to degraded image quality.
Innovation Solution
A display apparatus and method that includes a source driver with amplifier circuits and output switches, where sequentially delayed source output enable signals are applied to adjust the output period of the data signal based on the degree of gate signal delay, thereby compensating for position-based charging deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gate signal is applied to the display panel, then the pixels are charged with data signals, but the gate signal delay increases progressively in the center portion compared to the edge portion, causing luminance non-uniformity
Solution Approach 1:
The source output control circuit applies sequentially delayed source output enable signals to the output switches in advance, so that the data signal output timing is pre-adjusted to compensate for the gate signal delay. This preliminary timing adjustment ensures that pixels at different positions receive data signals at the appropriate moments, compensating for the progressive gate signal delay and achieving uniform pixel charging across the display panel.
Solution Approach 2:
The patent applies different delay amounts to different source output channels based on their position. The source output control circuit generates sequentially delayed enable signals where each channel receives a different delay amount corresponding to its position in the display panel. This local differentiation compensates for the position-dependent gate signal delay, ensuring that edge portions and center portions are charged uniformly despite the progressive delay.
2Manufacturing precision
If the gate signal delay is compensated by delaying the data signal output, then luminance non-uniformity is reduced, but the output timing of data signals becomes position-dependent
Solution Approach 1:
The source driver is divided into multiple independent amplifier circuits, each corresponding to a specific source output channel. The source output control circuit generates separate enable signals for each output switch, allowing independent timing control for each channel. This segmentation enables position-dependent delay adjustment without requiring complex centralized control, as each channel can be independently optimized for its specific position in the display panel.
Data Source
AI summary
A display apparatus includes where one pixel line including a plurality of pixels are provided in plurality, a gate driver configured to apply a gate signal to the one pixel line, and a source driver configured to apply a data signal to the one pixel line. The source driver includes amplifier circuits, output switches, a source output control circuit, and an offset control circuit. The source output control circuit applies sequentially delayed source output enable signals to the output switches to delay an output period of the data signal by units of source output channels, based on a degree of delay of the gate signal. The offset control circuit applies an offset control signal generated based on the sequentially delayed source output enable signals to the plurality of amplifier circuits to change an offset of each of the plurality of amplifier circuits in a masking period of the data signal.