Gamma Voltage Curve Adjustment for OLED Display Quality
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Solution Overview
Problem
OLED display apparatuses suffer from image distortion due to gray scale loss, where the reduction in gamma voltage leads to an inability to distinguish between different gray scales, resulting in poor image quality.
Innovation Solution
The method involves dividing the total gray scale range of a gamma voltage curve into multiple gray scale ranges, calculating ratios of gray scale data for each range, and adjusting the gamma voltage range division values to prioritize the range with the maximum ratio, thereby reducing image distortion and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gamma voltage range is divided uniformly across all gray scale ranges, then the device complexity is reduced and ease of manufacture is improved, but the image display quality deteriorates due to gray scale loss in critical ranges
Solution Approach 1:
The patent divides the gray scale range into multiple segments (first gray scale range and second gray scale range) with different division values. The first gray scale range uses a first division value while the second gray scale range uses a second division value, allowing differential treatment of different gray scale regions to improve display quality without excessive complexity
Solution Approach 2:
The patent applies different division values to different gray scale ranges based on their specific requirements. The first gray scale range (lower gray scales) uses a finer division value to prevent gray scale loss, while the second gray scale range (higher gray scales) uses a coarser division value, optimizing quality where it matters most
2Measurement precision
If the division value of gamma voltage range is increased for all gray scale ranges, then the measurement precision of gray scales is improved, but the loss of energy increases due to excessive voltage subdivision
Solution Approach 1:
The patent applies excessive action (finer division) only partially - specifically in the first gray scale range where gray scale loss occurs. The second gray scale range uses a coarser division, avoiding unnecessary energy consumption while maintaining adequate precision where needed
3Reliability
If the gamma voltage curve uses equal division values for all gray scale ranges, then the ease of operation is improved and device complexity is reduced, but the reliability of image display deteriorates due to gray scale loss in low gray scale ranges
Solution Approach 1:
The gamma voltage control is segmented into different regions with different division values. The first gray scale range uses a first division value and the second gray scale range uses a second division value, improving reliability by preventing gray scale loss in critical low gray scale regions
Solution Approach 2:
The patent changes the division value parameter based on the gray scale range. By adjusting the division value from the first value to the second value across different gray scale ranges, the system achieves better reliability without excessive complexity
Data Source
AI summary
A method for improving image display quality, including: dividing a total gray scale range of a gamma voltage curve of a display apparatus to obtain gray scale ranges; obtaining data of gray scales of frame(s) of image to be displayed by the display apparatus, and calculating a ratio of data of gray scales in each gray scale range; adjusting a division value of a gamma voltage range corresponding to each gray scale range of the gamma voltage curve according to calculated ratios, so that a division value of a gamma voltage range corresponding to a gray scale range with a maximum ratio is less than a division value of a gamma voltage range corresponding to any remaining gray scale range; and outputting gamma voltages corresponding to the data of gray scales of the frame(s) of image to be displayed according to the adjusted gamma voltage curve.