Backlight Dimming Using Convex Gain for LCD Power Efficiency
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Solution Overview
Problem
Existing backlight dimming methods for liquid crystal displays, such as global and local dimming, have limitations in reducing power consumption while maintaining image quality, particularly in adjusting luminance across the screen, as viewers are more sensitive to changes in the central part than the peripheral part, leading to inefficient power reduction.
Innovation Solution
A method that calculates a convex gain with lower values for the peripheral parts of the screen compared to the central part, using image analyzers and multipliers to adjust the backlight dimming value based on image complexity and luminance characteristics, reducing the perceived luminance change in the peripheral areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the backlight luminance is reduced in the peripheral part of the screen, then the power consumption is reduced, but the image quality may be degraded due to noticeable luminance changes
Solution Approach 1:
The patent applies different backlight luminance reduction strategies to different regions of the screen. The central region maintains higher luminance to preserve image quality where viewers are most sensitive, while the peripheral region allows greater luminance reduction to save power where viewers are less sensitive. This is achieved by dividing the screen into multiple regions and applying region-specific dimming factors.
Solution Approach 2:
The patent dynamically adjusts the backlight luminance parameter based on the displayed image content and viewer position. By analyzing the image data and determining appropriate dimming factors for different regions, the system changes the backlight luminance parameter to optimize both power consumption and image quality under varying conditions.
2Use of energy by moving object
If the backlight luminance is uniformly reduced across the entire screen, then the power consumption is reduced, but the contrast characteristic and image quality are degraded
Solution Approach 1:
Instead of uniform backlight reduction, the patent implements local quality control by applying different luminance reduction levels to different screen regions. The central region maintains higher luminance to preserve contrast and image quality, while peripheral regions allow greater reduction. This regional differentiation resolves the contradiction between power saving and contrast maintenance.
3Reliability
If the backlight luminance is increased in blocks with bright images, then the image quality is improved, but the power consumption increases
Solution Approach 1:
The patent applies local quality control by analyzing image content in different regions and applying appropriate luminance adjustments. Bright regions receive minimal or no additional luminance to maintain image quality, while dark regions allow greater luminance reduction for power saving. This regional differentiation resolves the contradiction between image quality and power consumption.
Data Source
AI summary
A backlight dimming method and a liquid crystal display using the same are disclosed. The backlight dimming method includes producing a first backlight dimming value controlling a backlight luminance of a liquid crystal display panel, producing a convex gain which has less value in a peripheral part of a screen of the liquid crystal display panel than a central part of the screen, reducing the first backlight dimming value to be applied to the peripheral part of the screen using the convex gain to produce a second backlight dimming value, and controlling the backlight luminance of the liquid crystal display panel using the second backlight dimming value.