Multiple Backlight Display System Localized Dimming
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Solution Overview
Problem
Edge-lit backlight systems in information handling systems face limitations in providing localized dimming and increased power consumption, making them inefficient for improving image quality and difficult to implement in mobile devices.
Innovation Solution
A multiple backlight display system that includes a light guide device with edge backlight devices and array backlight zones, allowing for independent brightness control of each zone to achieve localized dimming and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If edge-lit backlight subsystems are used to provide uniform backlighting, then the system achieves simplicity and energy efficiency, but the ability to perform localized dimming is limited
Solution Approach 1:
The backlight system is segmented into multiple independently controllable light source devices positioned at different edges of the light guide device. Each light source device can be adjusted individually to provide different brightness levels, enabling localized dimming while maintaining the simplicity of the edge-lit configuration.
Solution Approach 2:
Different portions of the display are provided with different backlighting characteristics by controlling individual light source devices at specific edges. This allows certain areas to be dimmed while other areas maintain higher brightness, creating local quality variations in the backlighting to improve image quality for specific display regions.
2Use of energy by moving object
If additional light source devices are added to the bezel for localized dimming, then some power efficiencies are achieved, but bezel dimensions and power consumption increase
Solution Approach 1:
Instead of adding multiple light source devices at all edges, the system uses a selective approach by positioning light source devices only at specific edges where localized dimming is needed. This partial action achieves power efficiency improvements without the excessive addition of components that would increase bezel dimensions.
3Device complexity
If edge-lit backlight subsystems are used, then the system structure is simple, but true localized dimming to particular image areas cannot be achieved
Solution Approach 1:
The system employs an asymmetric configuration by positioning light source devices at specific edges rather than uniformly at all edges. This asymmetric arrangement enables true localized dimming capability while maintaining relatively simple system structure, as light source devices are added only where needed rather than throughout the entire perimeter.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables true localized dimming and brightness control, enhancing image quality without degrading other image portions, while reducing power consumption and bezel size, making it suitable for mobile devices.
Implementation Method 1
a light guide device configured to distribute light from the edge backlight device and the array backlight zones across a display area of the display device
Implementation Method 2
a light guide device including a plurality of edges
Data Source
AI summary
A multiple backlight display system includes a display device having a light guide device including a plurality of edges. An edge backlight device is located along one of the edges of the light guide device. An array backlight device includes a plurality of array backlight zones that are located between the edges of the light guide device. A computing device receives an image for display on the display device and determines a plurality of brightness zones in the image. The computing device then generates backlight driving information using the plurality of brightness zones and provides the backlight driving information to the display device. The backlight driving information is configured to drive the array backlight device such a first array backlight zone provides light having a first brightness that is different than a second brightness of light that is provided by at least one second array backlight zone.