Light Guide Plate Recessed Reflective Surface Illumination Uniformity
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Solution Overview
Problem
Direct-type backlight modules suffer from non-uniform illumination due to the way light is refracted and reflected within the light guide plate, resulting in more intense illumination at the center and less at the edges.
Innovation Solution
Incorporating scattering dots on the bottom surface and a recessed reflective surface on the top surface of the light guide plate, along with a microprism, polarization, and diffusing plates, to scatter and redirect light uniformly across the surface, enhancing illumination uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a point light source is used in a direct-type backlight module, then high illumination can be provided, but the illumination uniformity deteriorates with the center part being more intense than the edges
Solution Approach 1:
The patent applies local quality by creating different surface structures at different locations of the light guide plate. The bottom surface has scattering dots with specific size distribution, and the top surface has a recessed reflective structure, making different regions of the light guide plate have different optical properties to achieve uniform illumination across the entire surface
Solution Approach 2:
The patent segments the light guide plate surface into distinct functional zones: the bottom surface with scattering dots for initial light diffusion, the recessed reflective structure for light redirection, and the combination creates multiple light paths that segment the illumination process to achieve uniformity
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 improved uniformity of light distribution across the backlight module, addressing the non-uniformity issue and enhancing the overall performance of direct-type backlight modules.
Implementation Method 1
Incorporating scattering dots on the bottom surface and a recessed reflective surface on the top surface of the light guide plate, along with a microprism, polarization, and diffusing plates, to scatter and redirect light uniformly across the surface
Implementation Method 2
The first part of the lights leave the light guide plate through a refraction of the top surface, and the second part of the light enter the light guide plate through a reflection of the top surface
Implementation Method 3
The first part of the lights leave the light guide plate through a refraction of the top surface
Data Source
AI summary
A light guide plate includes a body having a bottom surface, a top surface opposite to the bottom surface, and at least one lateral side. A recess is defined at the top surface. The recess is concaved toward the bottom surface and has a reflective surface. Only one part of the reflective surface has reflective structure located thereon. A backlight module using the light guide plate is related.