Display Brightness Adjustment via Gray Scale Compensation Mapping
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Solution Overview
Problem
Display brightness varies at different frequencies, leading to picture flicker when the working frequency changes, which reduces the overall display quality.
Innovation Solution
A method and apparatus that divide the display screen into preset and non-preset calibration areas, using a gray scale compensation mapping table to determine gray scale compensation values for each area, ensuring consistent brightness across different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display operates at variable refresh rates with longer blanking times at low frame rates, then the display can support diverse gaming modes and refresh rate requirements, but the overall brightness of the panel is reduced due to aggravated panel leakage
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing gray scale compensation values in a compensation mapping table for different refresh rates before actual display operation. When the refresh rate changes, the system directly retrieves the pre-computed compensation values rather than calculating them in real-time, enabling brightnes compensation during the blanking period without delaying the actual image display.
Solution Approach 2:
The patent changes the gray scale parameter of the display panel dynamically based on the refresh rate. By adjusting the gray scale compensation values in the mapping table corresponding to different refresh rates (60Hz, 120Hz, 144Hz, etc.), the system compensates for brightness variations caused by different blanking times while maintaining consistent perceived brightness across variable refresh rates.
2Speed
If the display switches between different frequencies within a short time, then the display can respond quickly to changing content requirements, but serious panel flicker occurs due to brightness differences at different frequencies
Solution Approach 1:
The patent implements feedback by using a compensation mapping table that stores pre-calculated gray scale compensation values for different refresh rates. When the refresh rate changes, the system retrieves the corresponding compensation values and applies them to adjust the gray scale output, creating a closed-loop compensation mechanism that maintains brightness stability during frequency transitions.
Solution Approach 2:
The system performs preliminary calculation and storage of compensation values for all possible refresh rate transitions. This allows instantaneous retrieval and application of appropriate compensation when frequency switching occurs, eliminating flicker without introducing noticeable delay in the frequency response.
3Illumination intensity
If gray scale compensation values are calculated for all pixel points across the entire display screen, then comprehensive brightness uniformity can be achieved, but the computational complexity and processing time increase significantly
Solution Approach 1:
The patent segments the display screen into multiple regions (center region and four corner regions) and calculates compensation values separately for each region. This segmentation allows the system to handle different brightness uniformity requirements for different areas of the display while reducing the overall computational complexity compared to treating all pixels uniformly.
Solution Approach 2:
The patent applies local quality by using different compensation strategies for different regions of the display. The center region and corner regions have different compensation characteristics, and the system applies region-specific compensation values from the mapping table to achieve optimal brightness uniformity in each local area rather than using a uniform compensation approach across the entire screen.
Data Source
AI summary
A method and an apparatus for adjusting a brightness of a display are provided. The method includes: acquiring a gray scale number and a working frequency; determining a first gray scale compensation value of a preset calibration area using a preset gray scale compensation mapping table; determining a second gray scale compensation value of a non-preset calibration area according to the first gray scale compensation value; controlling, according to the first gray scale compensation value, the preset calibration area for displaying; and controlling, according to the second gray scale compensation value, the non-preset calibration area for displaying.