Display Signal Gain Control for OLED Panel Temperature Rise
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Solution Overview
Problem
The challenge of suppressing temperature rise in display panels, particularly in self-luminous display devices like OLEDs, arises when increasing luminance, especially with methods that lead to repetitive high-luminance displays or high current loads.
Innovation Solution
A signal processing device that measures luminance enhancement time, temperature rise amount, and video signal features to adaptively control the gain for luminance enhancement, using multiple sensors and calculations to balance luminance and temperature rise, especially in WRGB pixel configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If luminance enhancement is applied to increase display brightness, then illuminance intensity is improved, but temperature of the display panel increases
Solution Approach 1:
The patent applies dynamics by making the luminance enhancement period variable rather than fixed. The control unit dynamically adjusts the duration of luminance enhancement based on real-time temperature measurements from the display panel, allowing the system to adapt between high brightness and temperature control requirements
Solution Approach 2:
The patent implements feedback control by continuously monitoring the display panel temperature and using this information to adjust the luminance enhancement period. The control unit receives temperature data and modifies the enhancement duration accordingly, creating a closed-loop system that balances luminance and temperature
2Illumination intensity
If luminance enhancement time is extended to maintain high brightness, then illuminance intensity is improved, but temperature rise amount increases
Solution Approach 1:
The system dynamically adjusts the luminance enhancement period duration based on real-time temperature conditions. When temperature rise is detected, the enhancement period is automatically shortened, preventing excessive temperature increase while maintaining adequate brightness when conditions permit
3Illumination intensity
If gain for luminance enhancement is increased to improve brightness, then illuminance intensity is improved, but temperature rise amount increases
Solution Approach 1:
The control unit uses temperature feedback to dynamically adjust the luminance enhancement gain. When the display panel temperature exceeds thresholds, the system reduces the enhancement gain applied to the video signal, thereby controlling temperature rise while preserving brightness enhancement capability when temperature is acceptable
Data Source
AI summary
Provided is a signal processing device including a signal processing unit that, when increasing the luminance of an video signal from a low-luminance display signal to a high-luminance display signal, acquires information regarding at least one of luminance enhancement time obtained by measuring the time for enhancing the luminance on a display panel, the temperature rise amount of the display panel, and the feature amount of the video signal corresponding to video displayed on the display panel, and adaptively controls a first gain for enhancing the luminance of the video signal, according to the degree of influence on the temperature rise of the display panel, in reference to the acquired information. The present technique can be applied to a self-luminous display device, for example.