Display Timing Controller for Temperature-Aware Pixel Brightness Compensation
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Solution Overview
Problem
Existing methods for preventing burn-in in displays by directly compensating pixel brightness lead to increased driving current and accelerated aging due to higher operating temperatures.
Innovation Solution
A pixel brightness compensation method that determines gain values based on current grayscale value, accumulated operating time, and temperature to convert the grayscale value to a target value, maintaining pixel brightness within a specific range and reducing aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel brightness is directly compensated to initial brightness, then burn-in effect is prevented, but driving current increases and operating temperature rises, accelerating aging
Solution Approach 1:
The patent changes the compensation parameter from full brightness restoration to partial brightness maintenance. Instead of compensating to initial brightness (100% restoration), the system compensates to maintain brightness within a specific range, using gain values that are less than what would be required for full restoration. This parameter adjustment prevents burn-in while avoiding excessive current increase and temperature rise that would accelerate aging.
2Stability of the object's composition
If pixel brightness is directly compensated, then brightness uniformity is improved, but energy consumption increases due to higher driving current
Solution Approach 1:
The patent applies partial action by compensating brightness only to the extent necessary to maintain uniformity within an acceptable range, rather than fully restoring to initial brightness. The gain values are calculated to provide just enough compensation to achieve brightness uniformity without excessive current increase. This partial compensation approach achieves the brightness uniformity goal while minimizing energy consumption and current draw.
Data Source
AI summary
The disclosure provides a pixel brightness compensation method, including: obtaining a current grayscale value of a pixel in a display and an accumulated operating time, a current temperature, and a current display brightness value of the display; determining a first gain value and a third gain value according to the current grayscale value, the current temperature and the accumulated operating time; generating a second gain value according to the current display brightness value; and converting the current grayscale value to a target grayscale value for the pixel by the first gain value, the second gain value, and the third gain value.