OLED Pixel Compensation via Periodic Brightness Sensing
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Solution Overview
Problem
In large-size OLED displays, the instability of sub-pixel units leads to decreased picture quality, and existing compensation methods are complex and inaccurate, making it difficult to distinguish the role of each compensation factor, resulting in inaccurate pixel compensation.
Innovation Solution
A pixel compensation method that generates a source voltage signal based on grayscale data and a compensation value in a current detection period to control light-emitting brightness, determines a sensing value, and adjusts the compensation value for the next detection period using the sensing value, brightness curve, and ideal brightness curve to improve accuracy and simplify the compensation algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple compensation factors are involved in sub-pixel compensation, then compensation coverage is comprehensive, but compensation algorithm complexity increases and accuracy decreases
Solution Approach 1:
The patent segments the compensation process into two distinct stages: detection period (measuring actual brightness) and non-detection period (applying compensation). This segmentation simplifies the algorithm by separating measurement from correction, avoiding the complexity of multiple simultaneous compensation factors while maintaining accuracy through sequential processing.
Solution Approach 2:
The patent performs preliminary detection of actual brightness during the detection period before applying compensation in the non-detection period. By measuring the actual brightness state first and then applying the appropriate compensation value, the system avoids the complexity of real-time multi-factor compensation while ensuring accurate correction based on actual pixel performance.
2Manufacturing precision
If sub-pixel compensation is performed to improve display quality, then picture quality improves, but detection and measurement difficulty increases
Solution Approach 1:
The patent employs a self-service detection mechanism where the display device uses its own sub-pixels to detect actual brightness during the detection period. By utilizing the pixel's own light emission characteristics rather than requiring external complex measurement equipment, the system simplifies the detection process while maintaining the precision needed for high-quality compensation.
3Measurement precision
If detection period is extended to improve measurement accuracy, then sensing precision improves, but time consumption increases
Solution Approach 1:
The patent implements periodic detection by allocating specific detection periods within the overall display refresh cycle. Instead of continuous detection that would consume excessive time, the system performs brightness measurements at regular intervals, achieving sufficient measurement precision for compensation while maintaining efficient time utilization and avoiding detection time overload.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively compensates for the aging conditions of sub-pixel units, reducing afterimages and uneven brightness issues, thereby improving the accuracy and display quality of OLED displays.
Implementation Method 1
generating, according to grayscale data and a compensation value of a sub-pixel in a current detection period, a source voltage signal to control light-emitting brightness of the sub-pixel
Implementation Method 2
generating a sensing value according to the light-emitting brightness of the sub-pixel
Data Source
AI summary
A pixel compensation method, a pixel compensation device and a display device. The pixel compensation method includes: generating, according to grayscale data and compensation value of a sub-pixel in a current detection period, a source voltage signal to control light-emitting brightness of the sub-pixel; generating a sensing value according to the light-emitting brightness of the sub-pixel; and determining a compensation value of the sub-pixel in next detection period, according to the grayscale data, the compensation value, and the sensing value of the sub-pixel in the current detection period.