Backlight Module Corner Brightness Uniformity
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Solution Overview
Problem
Liquid crystal display devices suffer from dark spots at the corners due to the lower light reflection efficiency caused by the slope or curvature of the reflective sheet being less than that of the edges, leading to uneven brightness.
Innovation Solution
A backlight module with adjusting members, such as protrusions or reflective elements, are used at the corners to match the slope or curvature of the reflective sheet with the edges, ensuring uniform light reflection and brightness across the module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the reflective sheet edges and corners are folded to form inclined surfaces or curved surfaces, then the light reflection efficiency is improved, but the corners still have lower slope or curvature than the edges, causing dark spots at the corners
Solution Approach 1:
The patent applies local quality by making the reflective sheet have different slope or curvature characteristics at different locations. Specifically, the corners are designed with a slope or curvature that matches the edges, creating localized optimization at the corner regions to ensure uniform brightness across the entire reflective sheet surface.
Solution Approach 2:
The patent changes the geometric parameters (slope or curvature) of the reflective sheet at the corners to match the edge parameters. This parameter adjustment ensures that the corners reflect light with the same efficiency as the edges, eliminating dark spots and achieving uniform brightness across the display device.
2Productivity
If the corners of the reflective sheet are folded to form inclined surfaces, then the edges and corners can reflect light more effectively, but the slope at the corners remains lower than at the edges, resulting in uneven brightness
Solution Approach 1:
The patent applies local quality by making the reflective sheet have different slope or curvature characteristics at different locations. Specifically, the corners are designed with a slope or curvature that matches the edges, creating localized optimization at the corner regions to ensure uniform brightness across the entire reflective sheet surface.
Solution Approach 2:
The patent changes the geometric parameters (slope or curvature) of the reflective sheet at the corners to match the edge parameters. This parameter adjustment ensures that the corners reflect light with the same efficiency as the edges, eliminating dark spots and achieving uniform brightness across the display device.
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 brightness at the edges and corners of the liquid crystal display device by matching the slope or curvature of the reflective sheet, thereby eliminating dark spots and improving light-exiting efficiency.
Implementation Method 1
The reflective sheet usually has a rectangular shape, and the edges and corners of the reflective sheet are folded, so that the edges and corners thereof can form inclined surfaces with a certain slope or curved surfaces with a certain curvature. In this manner, the edges and corners of the reflective sheet can reflect the light emitted by the point light sources more effectively
Data Source
AI summary
A backlight module and a display device are disclosed. The present disclosure relates to the technical field of display, whereby the technical problem of dark spots existing at the corners of the liquid crystal display device in the prior art can be solved. The backlight module comprises a reflective sheet and a plurality of light sources that are arranged on said reflective sheet, wherein the reflective sheet at edges and corners of said backlight module has a certain slope or curvature; and adjusting members, arranged at corners of said backlight module, so that the slope or curvature of the reflective sheet at the corners of said backlight module matches the slope or curvature of the reflective sheet at the edges of said backlight module.