OLED Brightness Compensation for IC Border Saw-Tooth Defects
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Solution Overview
Problem
In OLED display panels driven by multiple ICs, the lack of communication between ICs leads to brightness inconsistencies, resulting in saw-tooth defects at the borders of regions controlled by different ICs, as each IC cannot obtain data for sub-pixels controlled by the other IC, causing uneven brightness across the display.
Innovation Solution
A method and apparatus that involve obtaining the brightness of sub-pixels in one region and adjusting the brightness of sub-pixels near the border by calculating a brightness ratio with sub-pixels further away from the border, driven by the same IC, to ensure consistent brightness across the display, thereby mitigating saw-tooth defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two driving ICs are used to control different halves of the display panel, then the display panel can be driven with limited IC channels, but brightness inconsistency occurs at the border regions between the two IC-controlled areas
Solution Approach 1:
The patent applies local quality by implementing different brightness control strategies for different regions of the display panel. Specifically, sub-pixels in border columns (within N columns from the border) are subjected to brightness compensation based on their proximity to the border, while sub-pixels in non-border columns use standard brightness control. This regional differentiation resolves the brightness inconsistency at IC borders while maintaining overall system simplicity.
Solution Approach 2:
The patent changes the brightness parameter dynamically based on the spatial position of sub-pixels relative to IC borders. By calculating a compensation value derived from the brightness difference between adjacent sub-pixels and applying it to adjust the driving current, the system adapts brightness parameters locally to eliminate saw-tooth defects at border regions while preserving the two-IC architecture.
2Area of stationary object
If multiple ICs control different regions of the display panel, then the IC channel limitation is overcome, but communication between ICs is impossible leading to brightness differences at border regions
Solution Approach 1:
The patent implements self-service by enabling each IC to independently perform brightness compensation for its own border regions without requiring communication with the other IC. Each IC detects brightness differences within its controlled region and applies compensation locally, eliminating the need for inter-IC communication while maintaining brightness consistency across the entire display panel.
Solution Approach 2:
The patent applies preliminary action by pre-establishing the relationship between sub-pixel position and brightness compensation requirements. The system pre-calculates compensation values based on the known geometric configuration and border positions, allowing each IC to independently adjust brightness without real-time communication, thus ensuring reliability across the full display area.
3Manufacturing precision
If brightness compensation is applied to sub-pixels near the border, then saw-tooth defects are reduced, but additional processing steps are required
Solution Approach 1:
The patent applies partial action by implementing brightness compensation only for sub-pixels in border regions (within N columns from the IC border) rather than across the entire display panel. This selective approach achieves the necessary brightness uniformity at critical border areas while minimizing additional processing complexity compared to a full-panel compensation scheme.
Data Source
AI summary
Embodiments of the present disclosure provide a method and apparatus for controlling brightness of an OLED screen. The method comprises: obtaining brightness of a first sub-pixel in an M-th column of pixels; obtaining brightness of a second sub-pixel; and increasing brightness of the first sub-pixel based on a difference in brightness between the second sub-pixel and the first sub-pixel, if brightness of the second sub-pixel is greater than that of the first sub-pixel.