Display Driver Chip Gamma Correction Through Sub-Frame Grayscale Control
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Solution Overview
Problem
Existing display technologies face issues with inaccurate grayscale brightness display due to the non-linear relationship between display grayscales and gamma curves, leading to display quality degradation.
Innovation Solution
The method involves dividing the refresh period of an image frame into multiple sub-frames and controlling sub-pixels to display first grayscales based on first data signals, ensuring that the grayscales and data signals satisfy the gamma curve, thereby accurately displaying the desired brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display driver chip controls the display panel to display images using conventional methods, then the display device can function, but the brightness of grayscales cannot be accurately displayed
Solution Approach 1:
The refresh period is divided into multiple sub-frames, and the grayscale display is segmented into multiple stages with different first grayscales. This segmentation allows the system to achieve accurate grayscale brightness by combining multiple simpler display steps, resolving the contradiction between precision and complexity.
Solution Approach 2:
The patent changes the parameter of grayscale values dynamically across different sub-frames. By using different first grayscales in different sub-frames and adjusting the data signals accordingly, the system achieves accurate gamma curve compliance without requiring a single complex control mechanism.
2Manufacturing precision
If the refresh period is divided into sub-frames with different first grayscales, then the gamma curve is satisfied and grayscale brightness is accurate, but the control process becomes more complex
Solution Approach 1:
The system pre-determines the first grayscales and corresponding data signals for different sub-frames based on the target grayscale and gamma curve requirements. This preliminary calculation and preparation simplifies the actual display control process, as the driver chip only needs to sequentially output the pre-computed values during the sub-frames.
Solution Approach 2:
The patent implements a feedback mechanism where the display driver chip adjusts the first grayscales and data signals based on the relationship between adjacent sub-frames. By monitoring the grayscale transitions and ensuring they satisfy the gamma curve, the system achieves precise control without requiring overly complex real-time calculations.
Data Source
AI summary
A method for driving display of a display panel, a display driver chip and a display device are provided. The method includes: acquiring a to-be-displayed grayscale of a sub-pixel in a frame of a to-be-displayed image; determining whether the to-be-displayed grayscale meets a grayscale optimization condition of a gamma curve; on determining that the to-be-displayed grayscale meets the grayscale optimization condition of the gamma curve, dividing a refresh period of the to-be-displayed image into sub-frames; and in the refresh period of the to-be-displayed image, controlling the sub-pixel to display first grayscales based on first data signals; and the first grayscales are not equal to the to-be-displayed grayscale, the first grayscales and the first data signals corresponding to the first grayscales satisfy the gamma curve.