Dynamic Gamma Control for Light Emitting Display Lifespan
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Solution Overview
Problem
Conventional light emitting display devices use fixed gamma values, which are not adaptable to different multimedia display applications, leading to shortened lifespan and increased power consumption when displaying images with varying luminance requirements.
Innovation Solution
A light emitting display device that dynamically adjusts gamma values by using a pixel circuit unit, data driver, scan driver, black/white transition detector, and timing controller to detect and control the degree of black/white transition in images, applying appropriate gamma values to control luminance accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed gamma value is applied to optimize for a particular test pattern situation, then the display performance is improved for that specific scenario, but the device cannot adapt to multimedia display applications and experiences shortened life span when continuously displaying high luminance images
Solution Approach 1:
The patent implements dynamic gamma adjustment by detecting the degree of black/white transition in displayed images and automatically modifying the gamma value accordingly. The gamma corrector dynamically changes the gamma value based on real-time image content analysis, allowing the display to adapt between different application scenarios (video vs. text) without manual intervention, thus resolving the contradiction between fixed performance optimization and adaptability.
Solution Approach 2:
The patent changes the gamma parameter dynamically based on image content characteristics. By measuring the degree of black/white transition and adjusting the gamma value as a variable parameter, the system optimizes luminance control for different display scenarios. This parameter adjustment allows the display to maintain appropriate luminance levels for both video (high luminance) and text (low luminance) applications, preventing premature degradation while maintaining adaptability.
2Ease of operation
If high luminance is provided for text-oriented images with full white background to ensure readability, then the readability is improved, but the life span of the light emitting display is shortened and power consumption is increased
Solution Approach 1:
The patent adjusts the gamma parameter specifically for text-oriented images detected by the black/white transition detector. When text images with full white backgrounds are detected (indicating low degree of black/white transition), the system applies a lower gamma value to reduce luminance. This parameter adjustment maintains readability by preserving text contrast while significantly reducing power consumption and extending display life span compared to continuously providing high luminance.
Solution Approach 2:
The patent applies different luminance characteristics to different types of displayed content. By locally optimizing the gamma value based on the specific content type (video vs. text), the system provides high luminance for video applications where it is needed, but reduces luminance for text applications where it is not necessary. This localized quality adjustment eliminates unnecessary energy consumption while maintaining functionality where required.
3Illumination intensity
If high luminance is provided for video images to display high contrast between light and dark areas, then the contrast display quality is improved, but the life span of the display device is shortened
Solution Approach 1:
The patent dynamically adjusts the gamma value based on the detected degree of black/white transition in the displayed image. For video images with high contrast requirements (high degree of black/white transition), the system applies a higher gamma value to enhance luminance and contrast. For text images or other content types, it applies a lower gamma value. This dynamic adjustment ensures that high luminance is provided only when necessary for video display quality, while reducing overall luminance exposure to extend display life span.
Data Source
AI summary
A display device includes a pixel circuit unit comprising a plurality of pixels to display an image, a data driver to supply data signals to the pixel circuit unit, a scan driver to supply scan signals to the pixel circuit unit, a black/white transition detector to detect a degree of black/white transition of the image, a gamma corrector to adjust the data signal by providing a gamma value to the data driver, and a timing controller to apply control signals to the data driver and the scan driver, receive the degree of black/white transition from the black/white transition detector, and provide a corrected gamma control signal to the gamma corrector according to the degree of black/white transition.