Logo Controller Grayscale Adjustment for OLED Wear
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Solution Overview
Problem
Organic light emitting diodes in display devices, particularly those displaying logos in specific common areas, experience rapid degradation due to continuous high luminance, leading to uneven wear and reduced device lifespan.
Innovation Solution
A logo controller that adjusts grayscale values of logo areas and their peripheries based on display load, using detectors and correctors to generate image frames with optimized luminance levels, thereby reducing the differential stress on OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic light emitting diodes continuously emit light with high luminance to display logos in specific common areas, then the logo display quality is improved, but the degradation rate of the organic light emitting diodes in the logo area increases
Solution Approach 1:
The patent dynamically adjusts the grayscale values of pixels in the logo area and logo peripheral area based on detected display loads. When a high display load is detected, the controller reduces the luminance of pixels in these areas by modifying their grayscale values, thereby reducing the degradation rate while maintaining acceptable logo display quality. This parameter change approach allows the system to adapt luminance levels to operational conditions.
2Reliability
If the grayscale values of the logo area are reduced to decrease degradation, then the reliability is improved, but the logo visibility and image quality may deteriorate
Solution Approach 1:
The patent applies different grayscale adjustment strategies to different regions: the logo area, the logo peripheral area, and other areas. The controller detects the logo area and separately identifies the logo peripheral area, then applies targeted grayscale value adjustments only to these specific regions based on display load conditions. This localized approach ensures that logo visibility is maintained while reducing degradation in high-stress areas.
Solution Approach 2:
The patent implements dynamic grayscale value adjustment based on real-time display load detection. The controller continuously monitors the display load and adjusts the grayscale values of pixels in the logo and logo peripheral areas accordingly. This dynamic adaptation allows the system to maintain optimal logo visibility during low-load conditions while reducing luminance during high-load conditions to extend lifespan.
3Stability of the object's composition
If the grayscale values of the logo peripheral area are adjusted to reduce degradation differential, then the uniformity of wear is improved, but the image contrast and quality may be affected
Solution Approach 1:
The patent applies targeted grayscale adjustments specifically to the logo peripheral area based on detected display loads. The controller identifies pixels surrounding the logo area and applies appropriate grayscale value modifications only to these peripheral pixels, leaving other areas unchanged. This localized adjustment maintains image contrast and quality while reducing the degradation differential between the logo area and surrounding regions.
Data Source
AI summary
A logo controller includes: a logo area detector for detecting a logo area commonly included in a plurality of first image frames, based on the plurality of first image frames; a logo peripheral area setting unit for setting a logo peripheral area expanded based on the logo area; a display load determiner for calculating a display load value, based on grayscale values of at least one first image frame, and determining the difference between a logo peripheral area representative value based on grayscale values of the logo peripheral area and the display load value exceeds a first reference value; and a logo peripheral area corrector for generating a second image frame.