Backlight Module Regional Brightness Control via LED Arrays
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) have fixed power consumption for their backlight modules, which cannot adjust brightness regionally, leading to inefficiencies in energy usage and nonuniform brightness due to splicing issues in light guide panels.
Innovation Solution
A backlight module combining direct-lit and edge-lit LED arrays with light scattering structures on the light guide panel to control brightness regionally, using the scattering structures to disrupt total reflection and adjust light distribution, while the direct-lit LED array's region is controlled by an LED drive circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional backlight structures are used, then the backlight provides uniform illumination, but the power consumption cannot be adjusted region by region
Solution Approach 1:
The backlight module is divided into multiple independent LED arrays (first LED array, second LED array, third LED array) positioned at different locations. Each LED array can be controlled independently through separate drive circuits, enabling regional brightness adjustment and optimized power consumption based on display content requirements.
Solution Approach 2:
Different regions of the backlight module are equipped with LED arrays having different characteristics (direct-lit and edge-lit configurations). The light guide panel includes scattering structures in specific regions to control light distribution locally, allowing each area to be optimized for its specific functional requirements.
2Adaptability or versatility
If light guide panels are spliced together to adjust brightness region by region, then brightness adjustment is achieved, but nonuniform brightness and chromaticity occur at splicing gaps
Solution Approach 1:
Instead of splicing multiple light guide panels, the patent integrates multiple LED arrays directly into a single light guide panel structure. The first, second, and third LED arrays are positioned within the same panel framework, eliminating splicing gaps and ensuring uniform brightness and chromaticity across the entire display area while maintaining regional brightness adjustment capability.
3Illumination intensity
If direct-lit LED arrays are used, then light distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The light guide panel serves multiple functions simultaneously: it guides light from the LED arrays, distributes light uniformly across the display area, and incorporates scattering structures to control light emission angles. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process while achieving improved light distribution.
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
This solution allows for regional brightness adjustment, reducing power consumption and improving the backlight's displaying effect by ensuring uniform light intensity and reducing energy waste.
Implementation Method 1
a number of light scattering structures for scattering light rays are disposed on a light exiting surface or on a bottom surface of the light guide panel at both ends of the light guide panel adjacent to the edge-lit LED arrays
Data Source
AI summary
A backlight module comprises a backplate having a baseplate and side plates, a direct-lit LED array, edge-lit LED arrays and a light guide panel. The light guide panel is located above the baseplate. The direct-lit LED array is disposed between the baseplate and the light guide panel. The edge-lit LED arrays are disposed at two sides of the light guide panel and facing light incident surfaces thereof respectively. Light scattering structures for scattering light rays are disposed on a light exiting surface or on a bottom surface of the light guide panel. With the LED arrays and the light scattering structures, the light guide panel is divided into three backlight regions. Displaying of the backlight module is controlled region by region by the light scattering structures and the LED drive circuit to improve the brightness of the backlight module and reduce the power consumption of the liquid crystal module.