Display Device Peak Luminance Gamma Compensation
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Solution Overview
Problem
Display devices, such as OLEDs, experience image blur and motion picture response time issues due to peak luminance changes, which affect gamma values and display quality when using peak luminance driving methods.
Innovation Solution
A display device and method that maintain constant gamma characteristics by determining peak luminance based on a black duty ratio and target luminance, generating gray-luminance information, and producing corresponding gray-voltages to ensure consistent image luminance across various peak luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If peak luminance driving is implemented to reduce image blur and motion picture response time, then motion picture response time is improved, but gamma value changes occur and display quality deteriorates
Solution Approach 1:
The patent implements dynamic gamma compensation by adjusting gray voltages based on detected peak luminance values. The system continuously adapts the gamma characteristics during operation to maintain display quality despite changes in peak luminance driving conditions
Solution Approach 2:
The system measures actual peak luminance values and uses this feedback to adjust gray voltage levels. This closed-loop control ensures that gamma characteristics remain consistent by compensating for luminance-dependent variations in real-time
2Illumination intensity
If black duty ratio is changed to control average luminance, then average luminance control is improved, but peak luminance must change causing gamma value changes and display quality reduction
Solution Approach 1:
The patent changes the gray voltage parameter dynamically based on detected peak luminance levels. By adjusting the voltage applied to pixel electrodes according to actual luminance conditions, the system maintains consistent gamma characteristics across different black duty ratios and average luminance levels
Data Source
AI summary
A display device includes a display panel having a plurality of pixels, a controller configured to determine a peak luminance based on a target luminance and a black duty ratio that is a ratio of a black insertion period to a sum of an image display period and the black insertion period, to determine gray-luminance information representing a plurality of luminances respectively corresponding to a plurality of gray levels based on the peak luminance and a target gamma value, and to generate gray-voltage information representing a plurality of voltage levels respectively corresponding to the plurality of gray levels based on a target white color coordinate and the gray-luminance information, a gray voltage generator configured to generate a plurality of gray voltages having the plurality of voltage levels based on the gray-voltage information, and a data driver configured to provide the plurality of gray voltages corresponding to output image data as data voltages to the plurality of pixels in the image display period, and to provide a black data voltage to the plurality of pixels in the black insertion period.