Reflective Cavity Backlight Structure for Screen Brightness Uniformity
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Solution Overview
Problem
Direct-lit backlight modules suffer from uneven light distribution, with the center region being brighter than the surrounding areas, resulting in less than 60% light rays being uniform on the screen, affecting usage efficiency.
Innovation Solution
A reflective element with uneven top edges and spacers is used in the backlight module, featuring reflective cavities and spacers with inclined surfaces to separate and distribute light evenly, ensuring consistent brightness across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffusion plate is placed on the light board with a lightbox distance serving as a light mixing region, then the light sources can be arranged in a matrix, but the center region of the screen becomes brighter than the surrounding regions, resulting in less than 60% uniform light rays
Solution Approach 1:
The light board is segmented into multiple independent light emitting components arranged in a matrix, with each component having its corresponding reflective cavity. This segmentation allows independent control and optimization of light reflection for each region, enabling uniform brightness distribution across the screen.
Solution Approach 2:
The reflective cavities are designed with different cavity depths in different regions (deeper in center, shallower at edges) to create local quality variations. This compensates for the natural brightness distribution, making the center region less bright and edge regions brighter, achieving overall uniformity.
2Productivity
If the center region is always brighter than the surrounding regions in a direct-lit backlight module, then the light sources can be efficiently arranged, but the uniformity of light rays on the screen decreases to less than 60%
Solution Approach 1:
Different regions of the light board are equipped with reflective cavities having different depths - the center region has deeper cavities while edge regions have shallower cavities. This local differentiation in cavity depth creates corresponding local quality differences in light reflection, compensating for the inherent brightness non-uniformity while maintaining high light source efficiency.
Solution Approach 2:
The cavity depth parameter of the reflective cavities is changed according to position - deeper in the center and shallower at the edges. This parameter variation optimizes the light reflection characteristics for each region, transforming the brightness distribution from non-uniform to uniform while preserving the efficiency benefits of the direct-lit architecture.
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 solution achieves uniform light distribution on the screen by using spacers to separate reflective cavities, improving light uniformity in the central, transition, and peripheral regions, thereby enhancing the backlight module's efficiency.
Implementation Method 1
A reflective element with uneven top edges is used to change the uneven brightness in the backlight module, making the light rays on the screen of the display panel more uniform
Data Source
AI summary
A reflective element includes multiple reflective cavities and multiple spacers. Each reflective cavity has an upper opening, a lower opening, and a peripheral wall. A peripheral-wall bottom edge of the peripheral wall is disposed on a substrate of a light board, and the lower opening of the reflective cavity corresponds to one light emitting component. Each spacer includes a bottom surface, a first inclined surface, and a second inclined surface. The bottom surface is connected to the first inclined surface and the second inclined surface, and the bottom surface is disposed on the substrate and flush with the peripheral-wall bottom edge. The first inclined surface and the second inclined surface respectively serve as the side walls of adjacent two of the reflective cavities, and some of the spacers have a height difference between a top edge of the first inclined surface and a top edge of the second inclined surface.