Backlight Dimming via Light Contribution Ratios
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Solution Overview
Problem
Conventional local dimming techniques for LCDs fail to accurately adjust backlight brightness across display zones, leading to insufficient brightness in certain areas and inadequate display quality due to the inability to account for light source contributions from distant regions.
Innovation Solution
A dimming method and device that determine the needed intensity of each backlight source by analyzing light distribution information across the display panel, calculating light contribution ratios for each pixel from multiple light sources, and adjusting intensities accordingly to ensure uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional zone-based local dimming techniques are used, then the display panel can be divided into multiple zones with adjustable brightness, but the light source contribution from distant regions is not considered, leading to insufficient brightness in certain areas
Solution Approach 1:
The patent transitions from zone-based dimming to pixel-based dimming, adding the dimension of spatial precision. By calculating light contribution ratios for each pixel from multiple light sources, the system achieves precise brightness control at the pixel level rather than at the zone level, ensuring sufficient brightness in all areas including those affected by distant light sources
Solution Approach 2:
The patent implements a feedback mechanism by calculating the actual light contribution ratios of multiple light sources to each pixel based on light distribution information. This feedback allows the system to adjust each light source's intensity to achieve the desired brightness at each pixel position, compensating for the light contribution from distant regions that conventional methods miss
2Use of energy by moving object
If conventional local dimming techniques are used, then power consumption can be reduced by adjusting backlight brightness, but display quality becomes inadequate due to insufficient brightness in certain areas
Solution Approach 1:
The patent applies local quality by adjusting the brightness of each light source based on the specific light distribution requirements of different pixel positions. By calculating the light contribution ratio of each light source to each pixel and determining the needed intensity accordingly, the system achieves optimal brightness distribution across the display panel, ensuring high display quality while minimizing power consumption in each local region
Solution Approach 2:
The patent changes the parameter of light intensity distribution by calculating and adjusting the needed intensity of each light source based on light distribution information and light contribution ratios. This parameter optimization allows the system to achieve the minimum required brightness at each pixel position, improving display quality while reducing overall power consumption
Data Source
AI summary
A dimming method and dimming device for a backlight module are provided. The dimming method includes the following steps. Light distribution information of a plurality of light sources of the backlight module corresponding to a display panel is provided. According to the light distribution information of each of the light sources, a plurality of light contribution ratios of the light sources corresponding to a plurality of different positions of the display panel are obtained respectively. According to the light contribution ratios corresponding to the different positions, the needed intensity of each of the light sources is determined respectively.