Display Driving Voltage Compensation via Segmented Gamma Correction
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Solution Overview
Problem
Existing display technologies face issues with uneven illumination among pixels due to manufacturing processes and aging of light emitting materials, leading to poor image display quality, as prior art's linear compensation methods fail to effectively correct non-linear gamma curves.
Innovation Solution
A method that determines a gamma curve for each pixel, divides the driving voltage or gray scale voltage into multiple ranges, sets test points, and derives compensation parameters to adjust the voltage accordingly, ensuring closer alignment with actual gamma curves for improved compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If linear compensation method is used to correct driving gray scale voltage, then pixel brightness uniformity is improved to some extent, but compensation accuracy deteriorates because actual gamma curves are non-linear
Solution Approach 1:
The patent divides the driving voltage range into multiple segments (first driving voltage range, second driving voltage range, third driving voltage range) with different gamma values. Each segment has its own compensation parameters, allowing piecewise linear approximation of the non-linear gamma curve. This segmentation approach resolves the contradiction by achieving both reasonable uniformity across different voltage levels and improved accuracy within each segment.
Solution Approach 2:
The patent changes the gamma parameter from a single fixed value to multiple discrete values corresponding to different driving voltage ranges. By adjusting gamma values (e.g., 2.2 for low brightness, 1.8 for medium brightness, 1.5 for high brightness) and compensation parameters based on actual pixel characteristics measured at different voltage levels, the system achieves accurate compensation across the entire non-linear gamma curve while maintaining implementation simplicity.
2Measurement precision
If multiple test points and range division are implemented, then compensation accuracy is improved, but system complexity increases
Solution Approach 1:
The patent divides the driving voltage range into three segments with two threshold values (first threshold, second threshold). This segmentation creates multiple test points at boundary voltages without requiring excessive measurement points. The segmented approach achieves accurate piecewise linear compensation while keeping the system manageable by limiting the number of ranges and thresholds.
Solution Approach 2:
The patent determines compensation parameters (gamma values, offset values, slope values) for each voltage range based on actual pixel characteristics measured during manufacturing. These parameters are stored in lookup tables or compensation algorithms, allowing the system to achieve high accuracy through parameter selection rather than complex real-time calculations, thus reducing computational complexity while maintaining precision.
3Measurement precision
If piecewise linear compensation is used, then compensation accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent implements piecewise linear compensation by dividing the gamma curve into three linear segments, each with simple slope and offset parameters. The compensation calculation for any given voltage is performed using basic linear interpolation within the appropriate segment, avoiding complex non-linear calculations. This segmentation enables accurate gamma correction through simple arithmetic operations.
Solution Approach 2:
The patent pre-calculates and stores compensation parameters (gamma values, offset values, slope values) for each driving voltage range during manufacturing or system initialization. These pre-computed parameters are stored in memory or lookup tables, allowing the system to perform fast compensation by simply retrieving and applying the appropriate parameters based on the current voltage range, rather than performing complex real-time calculations.
Data Source
AI summary
Provided are a driving voltage compensation method, a gray scale compensation method and a display device. In the methods, the voltage is divided into a plurality of ranges which are different. The different compensation rules are configured for different ranges, and the corresponding compensation parameters of each range can be obtained by using the test points in each range, such that the compensation effect is closer to the actual gamma curve, so as to alleviate the technical problem of uneven display of pixels in the display panel of the prior art, for increasing the product yield of the display device.