Backlight Partition Control for LCD Power Reduction
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Solution Overview
Problem
Liquid crystal display devices face challenges in reducing power consumption while maintaining consistent screen brightness, especially when displaying static images, as they often require repeated grayscale compensation, leading to increased power usage and potential flickering.
Innovation Solution
The method involves determining preset parameters for each partition of the backlight, including grayscale and brightness, and using historical data from previous frames to calculate grayscale and backlight coefficients, allowing for accurate and stable image display with reduced power consumption by minimizing repeated compensation operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grayscale compensation is performed repeatedly for static images, then screen brightness consistency is maintained, but power consumption increases
Solution Approach 1:
The patent implements dynamic grayscale compensation by comparing current frame images with historical frame images. When changes are detected, compensation is performed; when no changes are detected (static images), compensation is skipped. This dynamic approach maintains brightness consistency only when necessary, reducing unnecessary power consumption for static displays.
Solution Approach 2:
The system changes the compensation parameter state based on image comparison results. By detecting whether the current frame differs from historical frames, the system adjusts the compensation operation state (perform or skip), thereby changing the energy consumption parameter while maintaining display quality where needed.
2Reliability
If grayscale compensation is performed frequently, then display stability is improved, but drive speed decreases
Solution Approach 1:
The patent introduces dynamic control of grayscale compensation operations by comparing current and historical frame images. The compensation process is activated only when image changes are detected, and skipped when images are identical. This dynamic mechanism maintains display stability for changing content while improving drive speed for static content by eliminating redundant operations.
Solution Approach 2:
The patent extracts and removes unnecessary grayscale compensation operations from the display processing pipeline. By identifying static images through frame comparison, the system extracts only the essential compensation operations needed for changing content, discarding redundant operations for static content, thereby improving overall drive speed while maintaining stability where required.
3Illumination intensity
If backlight is driven at high brightness, then screen visibility is improved, but power consumption increases
Solution Approach 1:
The patent implements local quality control by dividing the backlight into multiple zones and independently controlling the brightness of each zone based on the actual image content. Different partitions can have different backlight coefficients, allowing high brightness only where needed in the image while maintaining lower brightness in other areas, thus improving overall power efficiency while maintaining necessary visibility.
Solution Approach 2:
The system applies partial backlight compensation by calculating and applying backlight coefficients only to specific partitions that require adjustment based on image content analysis. Rather than uniformly adjusting the entire backlight, the system performs partial action on affected zones only, reducing overall power consumption while maintaining necessary screen brightness for visibility.
Data Source
AI summary
An embodiment of the present application discloses an image display method and device. The method includes: determining a first preset parameter of each partition of a backlight relative to a first frame image when a display request for the first frame image is detected, the preset parameter comprising grayscale and/or backlight brightness; acquiring a second preset parameter of each partition of the backlight relative to a second frame image, the second frame image being a previous frame image of the first frame image; determining a grayscale compensation coefficient of a first frame image according to the first preset parameter and the second preset parameter; determining a backlight coefficient of each partition of the first frame image; and driving the backlight according to the determined backlight coefficient of each partition and driving a display screen according to the grayscale compensation coefficient to display the first frame image.