Backlight Zone Drive Optimization for Power Efficiency
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Solution Overview
Problem
Existing display systems face challenges in balancing image quality and power consumption, as dynamic global backlight adjustments often result in higher power usage than necessary, especially in portable devices.
Innovation Solution
The method involves dividing the backlight system into zones, determining target illumination levels for each zone based on display panel data, and setting backlight drive values considering both local and neighboring zone contributions, allowing for independent control of brightness levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight brightness level is increased to improve image quality, then the image quality is improved, but the power consumption increases
Solution Approach 1:
The backlight system is divided into multiple independently controllable zones along the edges of the display panel. Each zone can be adjusted to different brightness levels based on local image requirements, allowing the system to provide high brightness only where needed rather than uniformly across the entire panel, thus reducing overall power consumption while maintaining image quality in critical areas.
Solution Approach 2:
Different zones of the backlight system are assigned different brightness characteristics according to the local content being displayed. Zones displaying bright or saturated content receive higher brightness, while zones displaying dark or neutral content receive lower brightness. This local optimization ensures high image quality where required while minimizing power consumption in areas where full brightness is unnecessary.
2Use of energy by moving object
If dynamic global backlight adjustment is used to reduce power consumption, then power consumption is reduced, but the backlight level is often higher than necessary resulting in wasted energy
Solution Approach 1:
The backlight system is segmented into multiple zones that can be independently controlled. This allows the system to apply dynamic brightness adjustment at the zone level rather than globally, so that each zone receives exactly the brightness needed for its local content requirements, eliminating the waste of energy that occurs when global dimming reduces brightness uniformly across the entire panel even in areas where high brightness is still needed.
Solution Approach 2:
The backlight brightness of each zone is dynamically adjusted in real-time based on the actual image content being displayed in that zone. The system continuously monitors the brightness requirements of different regions and adjusts the backlight drive values accordingly, ensuring that energy is not wasted by maintaining higher-than-necessary brightness levels in any zone while still providing sufficient brightness where required.
Data Source
AI summary
A method of optimizing the luminance level of a backlight system is presented. The method entails dividing the backlight system into zones, each of the zones having a light source; determining a target illumination level for each of the zones based on data values of a display panel that is to be illuminated by the backlight system; and setting a backlight drive value of the light source in a particular zone based on target illumination level of the particular zone and a backlight drive value assigned to its neighboring zone. The invention makes high-quality image display achievable with reduced power consumption by taking advantage of the “communal” aspect of the zones in a local dimming backlight system. In determining the backlight drive value of a zone, the invention takes into account the illumination contributions from neighboring zones.