Backlight Control for Display Boundary Brightness
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Solution Overview
Problem
In display devices with local dimming backlight modules, the brightness at the boundaries between light-emitting regions is often insufficient due to the inability of one backlight control circuit to obtain image data from other regions, degrading image quality.
Innovation Solution
A display device with a backlight control method that includes a first and second computing unit to calculate brightness distributions for overlapping ranges, allowing the first and second light-emitting regions to emit light according to these distributions, ensuring adequate brightness at boundaries and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple backlight control circuits perform local dimming in a divisional manner, then the local dimming function is achieved, but the brightness at the boundary of light-emitting regions becomes insufficient
Solution Approach 1:
The backlight source is divided into multiple light-emitting regions (first light-emitting region, second light-emitting region, etc.), each controlled by a separate backlight control circuit. This segmentation enables parallel local dimming control across different regions while maintaining independent optimization of each segment's brightness distribution.
Solution Approach 2:
The computing units calculate brightness distributions in advance for overlapping ranges that include boundary areas. By pre-calculating the brightness distribution for regions that span across multiple light-emitting region boundaries, the system ensures that boundary areas receive adequate brightness control before actual light emission occurs.
2Adaptability or versatility
If backlight module is divided into multiple light-emitting regions for different applications, then the adaptability for different display areas is improved, but the image quality at boundaries deteriorates
Solution Approach 1:
Each backlight control circuit is designed to handle multiple functions: controlling its primary light-emitting region and also contributing to the brightness control of adjacent regions through overlapping range calculations. This multi-functionality allows the system to adapt to different display area configurations while maintaining image quality at boundaries.
Solution Approach 2:
The computing units act as intermediaries that calculate brightness distributions for overlapping ranges. These calculated distributions serve as mediator information that is shared between adjacent backlight control circuits, ensuring coordinated control at boundaries and preventing brightness deficiencies.
3Device complexity
If one backlight control circuit cannot obtain image data of other light-emitting regions, then the control circuit complexity is reduced, but the brightness distribution at boundaries becomes insufficient
Solution Approach 1:
The computing units merge the image data from multiple sources by calculating brightness distributions for overlapping ranges that span across region boundaries. This merging process combines information about adjacent regions without requiring direct data sharing between separate control circuits, thus maintaining circuit independence while achieving coordinated boundary control.
Data Source
AI summary
Disclosed are a display device and a backlight control method for the display device. The display device includes a display panel, a backlight source, a first computing unit, and a second computing unit. The display panel includes a first display region and a second display region. The first light-emitting region corresponds to the first display region. The second light-emitting region corresponds to the second display region. The first computing unit calculates a first brightness distribution within a first range. The second computing unit calculates a second brightness distribution within a second range. The first light-emitting region emits light according to the first brightness distribution. The second light-emitting region emits light according to the second brightness distribution.