Variable Area Burn-In Compensation for Display Panels
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Solution Overview
Problem
Display devices such as OLED, micro LED, and LCD displays are susceptible to burn-in artifacts due to uneven pixel usage, particularly when pixels are placed above imaging elements like cameras, leading to rapid degradation in those areas.
Innovation Solution
A burn-in compensation system and method that uses image processing circuitry and a source driver to determine compensated luminance values for pixels in different areas of the display panel, taking into account accumulated luminance values and pixel layouts, to ensure uniform display quality and mitigate burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixels above imaging elements are driven with a brighter signal to maintain display uniformity, then display uniformity is improved, but pixel degradation rate increases leading to faster burn-in
Solution Approach 1:
The patent applies different compensation strategies to different regions of the display panel. Pixels above imaging elements (second region) receive scaled accumulated luminance values to account for their accelerated degradation, while other pixels (first region) use standard compensation. This localized differentiation resolves the contradiction by allowing brighter signaling where needed while applying enhanced protection where degradation is accelerated.
Solution Approach 2:
The patent dynamically adjusts the accumulated luminance values used for compensation based on the specific region of the display panel. By scaling the accumulated luminance values for pixels above imaging elements, the system changes the compensation parameter to match the actual degradation characteristics of different regions, thereby maintaining uniformity without uniformly accelerating all pixel degradation.
2Ease of manufacture
If a single pixel layout is used across the entire display panel, then manufacturing is simplified, but burn-in compensation accuracy deteriorates when imaging elements are present
Solution Approach 1:
The patent divides the display panel into multiple regions with different compensation characteristics. The first region contains pixels not above imaging elements with standard pixel density, while the second region contains pixels above imaging elements with potentially different density or layout requirements. This segmentation allows each region to be optimized for its specific function while maintaining overall manufacturing feasibility.
Solution Approach 2:
The patent implements region-specific compensation parameters tailored to the local characteristics of different display areas. Pixels in the second region above imaging elements receive differentiated treatment through scaled accumulated luminance values, allowing accurate burn-in compensation that accounts for local degradation patterns while the overall panel maintains a unified structure for manufacturing purposes.
Data Source
AI summary
A display driver that includes image processing circuitry and a source driver. The image processing circuitry is configured to perform a burn-in compensation to determine a first compensated luminance value for a first pixel in a first area of a display panel based at least in part on a first accumulated luminance value for the first pixel. The first area has a first pixel layout. The image processing circuitry is further configured to scale a second accumulated luminance value for a second pixel in a second area of the display panel to determine a scaled accumulated luminance value. The second area has a second pixel layout different from the first pixel layout. The image processing circuitry is further configured to perform a burn-in compensation to determine a second compensated luminance value for the second pixel based at least in part on the scaled accumulated luminance value.