Backlight Module Light Reflection Layer for Uniform Brightness
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Solution Overview
Problem
In liquid crystal display modules, the side illumination backlight system creates uneven light distribution due to a dark area near openings, affecting the display effect, and existing solutions to adjust light-guiding plates are costly and difficult to implement.
Innovation Solution
A backlight module with a dimming component featuring a light reflection layer, including a first and second reflecting region with varying reflectance, is positioned at the through-hole region to redirect light from the backlight source, ensuring uniform brightness by reflecting more light to the dark areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a side-illumination backlight source is used, then the screen ratio can be increased, but a dark area forms at the opening position with uneven light distribution
Solution Approach 1:
The light reflection layer is designed with spatially varying reflectance properties: the first light reflection region has higher reflectance to compensate for dark areas, while the second light reflection region has lower reflectance to prevent over-brightening already illuminated areas. This local differentiation of optical properties resolves the contradiction by maintaining high screen ratio while achieving uniform light distribution across the display surface.
2Illumination intensity
If the sizes and positions of screen dots of a light-guiding plate are adjusted to eliminate the dark area, then the light distribution can be improved, but the technical difficulty and cost increase
Solution Approach 1:
The invention extracts the light redistribution function from the light-guiding plate structure itself and relocates it to a separate light reflection layer. This layer is positioned at the opening side and contains patterned light reflection regions that redirect light from the backlight source to illuminate dark areas. By separating this function into a distinct component, the light-guiding plate design remains simple while achieving uniform light distribution through the added reflection layer.
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 effectively brightens dark areas and balances light distribution across the backlight side, achieving uniform brightness and improving the display effect without increasing the complexity or cost of the light-guiding plate.
Implementation Method 1
After the first light-reflecting region receiving light from a backlight source, the light is reflected to the backlight side of the through-hole to brighten the backlight side
Data Source
AI summary
A backlight module and a display device are provided. A light reflection layer is disposed at a backlight side of a through-hole region. And the light reflection layer is disposed at an inner side of an iron frame. After a reflection surface (i.e., a first light-reflecting region) receiving light from a backlight source, the light is reflected to the backlight side of the through-hole to brighten the backlight side. The first light-reflecting region enables a relatively dark area of the backlight side to obtain stronger reflection light, and enables a relatively bright area of the backlight side to obtain weaker reflection light, so that a brightness is uniformly distributed after the backlight side being brightened, thereby achieving a brightening effect.