Display Zonal Attenuation With Inverse Mask Brightness Compensation
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Solution Overview
Problem
Backlit display screens in mobile devices consume significant power, with zonal attenuation methods potentially wasting power by redirecting current to the central region, counteracting intended power savings.
Innovation Solution
Implementing inverse zonal attenuation masks to offset increased brightness in the central region of the display panel by applying a partial inverse mask to compensate for power diversion caused by zonal attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If zonal attenuation mask is applied to reduce brightness in peripheral regions, then power consumption is reduced, but brightness uniformity deteriorates due to current diversion to central region
Solution Approach 1:
The patent applies preliminary anti-action by introducing an inverse zonal attenuation mask that anticipates and counteracts the unwanted current diversion effect. The inverse mask is designed to preemptively reduce brightness in the central region, preventing the brightness uniformity deterioration before it fully occurs, while still maintaining the power savings from peripheral attenuation.
2Use of energy by moving object
If zonal attenuation mask diverts current from peripheral regions, then power consumption is reduced, but brightness in central region increases excessively
Solution Approach 1:
The patent applies local quality by creating spatially varying attenuation characteristics across different regions of the display. The inverse zonal attenuation mask applies different attenuation factors to different zones - specifically reducing brightness in the central region while maintaining or minimizing attenuation in peripheral regions, thereby achieving localized brightness control that addresses the central region over-brightness issue without sacrificing the power savings from peripheral attenuation.
3Illumination intensity
If inverse zonal attenuation mask is applied to reduce central region brightness, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display into distinct zones (central region and peripheral regions) with different attenuation characteristics. The inverse zonal attenuation mask is segmented to apply different attenuation factors to different zones, allowing independent optimization of brightness in each region. This segmented approach simplifies the overall control strategy compared to attempting uniform adjustment across the entire display, while still achieving improved brightness uniformity.
Data Source
AI summary
This document describes systems and techniques directed at zonal attenuation compensation. In aspects, a system includes a graphics processing unit configured to provide image data to a display panel. A zonal attenuation module is configured to combine a zonal attenuation mask with the image data to generate masked image data, the masked image data having a reduced brightness for portions of data corresponding to one or more regions on the display panel based on the zonal attenuation mask. An inverse zonal attenuation module is configured to apply an inverse zonal attenuation mask to the masked image data to reduce a brightness for additional portions of data corresponding to one or more additional regions on the display panel effective to offset increased brightness in the one or more additional regions on the display panel.