Differential Pixel Scalar Compensation for OLED Burn-In Correction
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Solution Overview
Problem
Display aging, particularly in OLED displays, leads to uneven brightness degradation causing visible 'burn-in' effects due to non-uniform pixel aging, which existing methods address inadequately by applying a common scalar across the display, resulting in brightness loss in non-degraded areas.
Innovation Solution
A system and method for applying differential compensation scalars to display pixels, adjusting drive currents based on pixel degradation and spatial relationships, using required and applied scalars to maintain maximum current limits while minimizing perceptible transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a common scalar is applied across the display to compensate for pixel degradation, then pixel brightness uniformity is improved, but brightness in non-degraded areas deteriorates due to unnecessary dimming
Solution Approach 1:
The patent divides the display into multiple zones based on pixel degradation characteristics. Each zone is assigned a different scalar value tailored to its specific degradation level, rather than applying a single common scalar to the entire display. This segmentation allows precise compensation in degraded areas while preserving brightness in non-degraded areas.
Solution Approach 2:
The patent implements local quality by applying different scalar values to different spatial regions of the display based on local degradation measurements. Each pixel or pixel group receives a customized scalar according to its specific degradation state, enabling localized brightness correction without affecting other regions.
2Illumination intensity
If elevated drive current is applied to degraded pixels to restore brightness, then pixel luminance is improved, but drive current threshold is exceeded causing distortion
Solution Approach 1:
The patent changes the scalar parameter dynamically based on pixel degradation levels and spatial relationships. By adjusting the scalar value for each pixel or zone, the system optimizes drive current within safe thresholds while achieving adequate luminance compensation. The scalar acts as a scaling factor that modulates the elevated current to prevent threshold violation.
Solution Approach 2:
The patent applies partial compensation rather than full compensation for pixel degradation. Instead of restoring every pixel to its original brightness level (which would exceed current thresholds), the system applies a scaled-down compensation that provides sufficient visual correction while maintaining drive current within safe operating limits.
3Object-generated harmful factors
If aggressive scalar compensation is applied to degraded pixels, then visible burn-in artifacts are reduced, but power consumption increases due to elevated drive currents
Solution Approach 1:
The patent applies partial scalar compensation that provides sufficient visual correction for burn-in artifacts without fully restoring all degraded pixels. This partial action approach reduces the need for excessively elevated drive currents, thereby lowering power consumption while still achieving acceptable artifact reduction.
Solution Approach 2:
By segmenting the display into zones with different degradation levels, the patent applies aggressive compensation only where necessary (highly degraded zones) and milder compensation or no compensation in less degraded areas. This selective approach minimizes overall power consumption while effectively addressing visible burn-in artifacts in critical regions.
Data Source
AI summary
Disclosed is the differential application of scalars to compensate pixel degradation. Input image data is associated with a commanded luminance at each of a plurality of pixels. A degradation value is determined for each pixel. Based on the degradation value, an elevated drive current is determined to produce commanded luminance at the pixel. A required scalar is determined for each pixel to hold the elevated drive current from exceeding a drive current threshold. An applied scalar for each pixel is determined for each pixel to be applied to the elevated drive current. For at least some pixels, the applied scalar for a first pixel is based at least on [1] the required scalar of a second pixel and [2] a spatial relationship between the first pixel and the second pixel. Applied scalars are then used to output corrected imagery.