Display Device Temperature Compensation Grayscale Scaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in maintaining target luminance due to changes in ambient temperature, as the current flowing through the display panel varies with temperature, affecting the luminance of the emitted light.
Innovation Solution
A display device is designed with a compensator that scales grayscale values of input image data based on temperature data, generating compensation image data to adjust the luminance, and includes a power control signal to manage the voltage level of the reference voltage, ensuring consistent target luminance regardless of ambient temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the display panel operates without temperature compensation, then the device complexity is reduced, but the luminance stability deteriorates due to ambient temperature changes
Solution Approach 1:
The compensator performs preliminary scaling of grayscale values based on temperature data before the image data is processed by the timing controller and data driver. By pre-adjusting the grayscale values according to the ambient temperature, the system compensates for temperature-induced luminance changes in advance, maintaining stable luminance output without adding complex real-time adjustment mechanisms during operation.
2Stability of the object's composition
If grayscale values are scaled to compensate for temperature changes, then the luminance stability is improved, but the device complexity increases due to the compensator and temperature data requirements
Solution Approach 1:
The compensator changes the grayscale values (parameter adjustment) based on temperature data to compensate for luminance variations. By scaling the grayscale values according to the ambient temperature conditions, the system maintains consistent luminance output across different temperature environments through parameter modification rather than hardware changes.
3Stability of the object's composition
If the grayscale values are scaled down when ambient temperature is high, then the luminance stability is improved, but the image brightness decreases
Solution Approach 1:
The system uses temperature data as feedback to determine the appropriate scaling factor for grayscale values. The compensator receives temperature information and automatically adjusts the grayscale scaling accordingly - reducing grayscale values when temperature is high to prevent excessive luminance, and increasing them when temperature is low to maintain adequate brightness, thus maintaining stable luminance characteristics across temperature variations.
Data Source
AI summary
A display device includes a pixel unit including pixels, a compensator which generate compensation image data by scaling grayscale values of input image data based on temperature data corresponding to an ambient temperature of the pixel unit, a timing controller which generates image data based on the compensation image data, and a data driver which generates a data signal corresponding to the image data and supply the data signal to the pixels. The compensator scales the grayscale values of the input image data in a way such that the grayscale values of the input image data decrease when the ambient temperature is greater than a reference temperature. The compensator scales the grayscale values of the input image data in a way such that the grayscale values of the input image data increase when the ambient temperature is less than the reference temperature.