Backlight Adjustment for LCDs via Dynamic Brightness Enhancement
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Solution Overview
Problem
Existing backlight adjustment methods for LCDs reduce overall brightness, especially for bright images, leading to poor display quality and increased power consumption, while also failing to effectively mitigate the 'ripple phenomenon' (mura) on screens.
Innovation Solution
A method that divides a frame of a picture into image blocks, calculates sub-backlight brightness, and determines whether enhancement is needed based on average backlight brightness, applying enhancement to sub-backlight brightness when the average is higher than a preset value to improve display brightness and contrast, thereby reducing power consumption and minimizing mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If sub-backlight brightness is calculated by averaging display brightness of pixels in each image block, then power consumption is reduced and contrast is increased, but overall brightness of the picture is reduced especially for bright pictures
Solution Approach 1:
The patent introduces a brightness enhancement parameter (enhancement factor) that multiplies the calculated sub-backlight brightness. This parameter is adjusted based on the average brightness of the picture, allowing the system to compensate for brightness loss while maintaining the energy-saving benefits of localized backlight adjustment. When the picture is bright, the enhancement factor increases to maintain overall brightness; when the picture is dark, the enhancement factor decreases to preserve power savings.
2Use of energy by stationary object
If sub-backlight brightness is reduced to save power, then power consumption decreases, but display quality is lowered for bright images
Solution Approach 1:
The patent uses a brightness enhancement factor that is dynamically adjusted based on the average brightness of the picture. This factor compensates for the brightness reduction caused by localized backlight adjustment, ensuring that display quality is maintained for bright images while still achieving power savings. The enhancement factor acts as a correction parameter that balances power consumption and display quality.
3Illumination intensity
If average brightness of pixels in each image block is used to calculate sub-backlight brightness, then contrast is increased, but brightness distribution becomes uneven leading to mura effect
Solution Approach 1:
The patent applies local quality by dividing the backlight into multiple independent sub-regions that can be adjusted differently. Each sub-region's brightness is calculated based on the local image block's brightness characteristics, allowing contrast enhancement in specific areas while maintaining overall brightness uniformity through the enhancement factor. This localized adjustment prevents the mura effect by ensuring each region receives appropriate brightness compensation.
4Use of energy by stationary object
If backlight brightness is reduced in each image block to save power, then power consumption is reduced, but the ripple phenomenon (mura) on screen is not effectively reduced
Solution Approach 1:
The patent introduces a brightness enhancement factor that compensates for the brightness reduction in each sub-region. By adjusting this factor based on the average picture brightness, the system maintains sufficient overall brightness to prevent liquid crystal aggregation and mura effects, while still achieving power savings through localized backlight control. The enhancement factor ensures that power consumption is reduced without compromising screen uniformity.
Data Source
AI summary
The present invention provides a backlight adjustment method, a backlight adjustment system and a display device. The backlight adjustment method comprises: dividing a frame of picture into n image blocks, obtaining the sub-backlight brightness corresponding to each image block, and further comprises: calculating an average backlight brightness corresponding to the frame of the picture on the basis of each sub-backlight brightness, determining whether the sub-backlight brightness needs to be enhanced on the basis of the average backlight brightness, and performing enhancement for the sub-backlight brightness which needs to be enhanced, wherein n is an integer greater than 1. The backlight adjustment method not only solves the problems of reduced brightness for bright picture and poor display effect associated with existing backlight adjustment method, but also reduces the overall display power consumption, increase the image contrast and reduce influence of mura (ripple phenomenon) on the screen.