Display Luminance Compensation via Frequency-Specific Gamma Curves
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Solution Overview
Problem
Display devices operating in variable frame mode experience luminance non-uniformity due to frequency mismatches between the rendering frequency of the host processor and the driving frequency of the display device, leading to tearing phenomena and inconsistent image quality.
Innovation Solution
A method is introduced to compensate for luminance by determining position compensation values for panel blocks based on luminance differences, generating gamma curves for specific driving frequencies, and adjusting input image data accordingly to synchronize luminance across different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If variable frame mode is implemented to synchronize rendering frequency and driving frequency, then tearing phenomenon is prevented, but luminance uniformity deteriorates
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple blocks and generating separate gamma curves for different driving frequencies. Each block's luminance characteristics are compensated independently through position compensation values, allowing localized adjustment of luminance uniformity across different frequency ranges while maintaining the variable frame mode's tear-free benefit
Solution Approach 2:
The patent changes the gamma curve parameters based on driving frequency. By storing multiple gamma curves corresponding to different driving frequencies and selecting the appropriate curve based on the current frequency, the system dynamically adjusts luminance characteristics to maintain uniformity across variable frame rates
2Illumination intensity
If gamma compensation is applied for each driving frequency, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing position compensation values and gamma curves for various driving frequencies before actual operation. During runtime, the system simply retrieves the pre-computed compensation data corresponding to the current driving frequency, avoiding complex real-time calculations and reducing operational complexity
Solution Approach 2:
The patent uses copying by creating multiple gamma curves that are copies of the base gamma curve, each adjusted for specific driving frequencies. These copied and modified gamma curves are stored in a lookup table, allowing the system to switch between frequency-specific curves without complex generation algorithms during operation
Data Source
AI summary
A method of compensating for luminance of a display device includes determining position compensation values of each of panel blocks for measurement grayscale values based on a difference between luminance of a reference panel block and luminance of the each of the panel blocks for the measurement grayscale values, generating a first gamma curve for a first driving frequency and the position compensation values of the each of the panel blocks for the measurement grayscale values, generating a second gamma curve for a second driving frequency and the luminance of the panel blocks for the measurement grayscale values at the first driving frequency, and compensating for input image data based on the first gamma curve and the second gamma curve.