Display Brightness Compensation Circuit for Black Frame Uniformity
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Solution Overview
Problem
The addition of a switching black process in display devices leads to uneven display brightness in different areas, causing non-uniform brightness due to differing display periods in sub-pixel rows.
Innovation Solution
A method and circuit for compensating display brightness by dividing sub-pixel rows into groups, adjusting luminous brightness using correlation curves and data signals, and inserting interval periods to synchronize display times, ensuring uniform brightness across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switching black process is added to prevent smear phenomenon, then dynamic image quality is improved, but display brightness uniformity deteriorates
Solution Approach 1:
The display device divides sub-pixel rows into multiple groups (first group and second group) with different display modes. The first group performs normal display while the second group performs black frame insertion display, or vice versa in alternating frames. This segmentation allows different regions to have different display characteristics, preventing brightness non-uniformity while maintaining smear reduction benefits.
Solution Approach 2:
The patent implements periodic switching between different display modes for different sub-pixel row groups across alternating frame periods. In odd frames, the first group performs normal display and the second group performs black frame insertion; in even frames, this is reversed. This periodic action ensures that over time, all regions experience both modes, maintaining overall brightness uniformity while preventing smear.
2Reliability
If black frame insertion display is performed in some sub-pixel rows, then smear phenomenon is reduced, but display period difference causes brightness non-uniformity
Solution Approach 1:
The patent dynamically adjusts which sub-pixel row groups perform normal display and which perform black frame insertion display based on the current frame number. The display mode is not fixed but changes periodically, allowing the system to adapt and balance the display periods across different regions, thereby maintaining brightness uniformity while achieving smear reduction.
Solution Approach 2:
Different sub-pixel row groups are assigned different display qualities (normal display vs. black frame insertion display) in a given frame, with the assignment changing over time. This local differentiation allows each region to receive appropriate treatment for its specific needs while maintaining overall system uniformity through periodic switching.
Data Source
AI summary
A method for compensating display brightness, a circuit for compensating display brightness, and a display device are provided. The method for compensating display brightness is applicable to a display device. A first group of sub-pixel rows in the display device perform normal display and black frame insertion display in a same frame display period. A second group of sub-pixel rows in the display device perform normal display in a current frame display period and an adjacent next frame display period, and perform black insertion display in the adjacent next frame display period. A first interval period is provided between the current frame display period and the adjacent next frame display period. The method for compensating includes: compensating luminous brightness of the first group of sub-pixel rows and/or compensating luminous brightness of the second group of sub-pixel rows.