Region-Adaptive Gray Level Conversion for Power Reduction
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Solution Overview
Problem
Self-luminous flat panel displays face a challenge in high ambient illuminance conditions, where increased screen brightness for improved visibility leads to higher power consumption, reducing usage time in mobile equipment.
Innovation Solution
A power consumption reduction device with a region-adaptive gray level conversion unit that converts gray level information in low and high gray level regions to reduce power consumption while maintaining visibility by preserving information in intermediate gray level regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If screen brightness is increased to improve visibility in high ambient illuminance conditions, then visibility is improved, but power consumption increases
Solution Approach 1:
The patent divides the screen into multiple gray level regions (first region with lower gray levels and second region with higher gray levels) and applies different bit depth reductions to each region. This segmentation allows selective reduction of gray level information in regions where it is less critical for visibility, thereby reducing overall power consumption while maintaining visibility in critical regions.
Solution Approach 2:
The patent applies different processing strategies to different parts of the image data. Specifically, it reduces bit depth more aggressively in the first gray level region compared to the second gray level region, recognizing that human perception and visibility requirements differ across gray level ranges. This local differentiation optimizes the balance between power consumption and visibility.
2Use of energy by moving object
If gray level information is reduced to decrease power consumption, then power consumption is reduced, but visibility may degrade
Solution Approach 1:
The patent dynamically adjusts the number of bits allocated to represent gray levels in different regions based on visibility requirements. Instead of uniformly reducing bit depth across the entire image, it adaptively determines that the first gray level region can tolerate greater reduction (e.g., 1 bit) while the second region maintains higher fidelity (e.g., 2 bits), optimizing the trade-off between power consumption and visibility preservation.
Solution Approach 2:
The patent changes the parameter of bit depth for gray level representation in different regions. By reducing the number of bits for the first gray level region more than the second region, it achieves power consumption reduction while maintaining visibility in regions where gray level differentiation is more critical for perceived image quality.
Data Source
AI summary
A power consumption reduction device includes a region-adaptive gray level conversion unit wherein the gray level conversion unit is operable to convert n1 bits of gray level information for a low gray level region into m1 (<n1) bits of gray level information, further operable to convert n2 bits of gray level information for an intermediate gray level region into m2 (≦n2) bits of gray level information, and still further operable to convert n3 bits of gray level information for a high gray level region into m3 (<n3) bits of gray level information, and the gray level conversion unit converts a gray level of an input video signal so that m1≦m2, m3≦m2 and n1+n2+n3>m1+m2+m3 are all satisfied.