Light Guide Plate Curved Surface Design for Backlight Efficiency
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Solution Overview
Problem
Conventional light guide plates in backlight modules suffer from reduced light utilization efficiency due to diffused light rays not being emitted from the light emitting surface, leading to brightness and uniformity issues, and difficulty in controlling light emitting angles.
Innovation Solution
A light guide plate with a design featuring a plurality of light guide units having first and second curved surfaces with specific curvature radii and angles, allowing for regulation of light emitting angles and improving light emitting efficiency, which is integrated into a backlight module with an optical sheet and reflective sheet to enhance light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sandblasted structures are formed on the light emitting surface to diffuse light rays, then light diffusion is improved, but light emitting efficiency is reduced and light utilization efficiency decreases
Solution Approach 1:
The patent replaces sandblasted structures with light guide units having curved surfaces (first and second curved surfaces with different curvature radii). The curved surfaces refract light rays at controlled angles, achieving light diffusion without the energy loss associated with sandblasted structures. This resolves the contradiction by providing an alternative mechanism that accomplishes light diffusion while maintaining light emitting efficiency.
2Ease of manufacture
If sandblasted structures are used to diffuse light, then light diffusion is achieved, but control over light emitting angle becomes difficult
Solution Approach 1:
The light guide units feature precisely engineered curved surfaces with specific curvature radii. The first curved surface has a different curvature radius than the second curved surface, allowing precise control over light refraction angles. This curved surface design enables accurate control of light emitting angles while maintaining ease of manufacturing through standardized unit structures.
Solution Approach 2:
Different regions of the light guide units have different curvature characteristics (first curved surface vs. second curved surface with different radii). This local variation in curvature quality allows different parts of the light guide structure to perform different functions: one surface for initial light guidance and another for controlled emission at specific angles, achieving both manufacturing ease and angular precision.
3Loss of energy
If V-shaped light guide units are formed on the bottom surface for total reflection, then light utilization is improved, but brightness and uniformity cannot be easily adjusted
Solution Approach 1:
The patent replaces V-shaped light guide units with light guide units featuring curved surfaces. The curved surfaces provide controlled refraction rather than fixed total reflection, enabling adjustment of brightness and uniformity while maintaining light utilization efficiency. The different curvature radii allow optimization of light paths for both efficiency and visual quality.
Solution Approach 2:
The light guide units with curved surfaces provide dynamic control over light emission characteristics. By adjusting the curvature radii and angles of the curved surfaces, the system can adaptively control brightness distribution and uniformity, unlike the fixed V-shaped structures that provide only static total reflection.
4Ease of manufacture
If conventional light guide plate structures are used, then manufacturing is simplified, but brightness uniformity and light emitting angle control are compromised
Solution Approach 1:
The light guide plate is divided into multiple light guide units, each with standardized curved surface structures. This segmentation allows the complex curved surface geometry to be manufactured using standardized processes, maintaining ease of manufacture while achieving precise control over light emission characteristics and brightness uniformity through the repeated modular units.
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 high light emitting efficiency and uniformity of light emitting angles, resulting in improved brightness and light utilization efficiency of the plane light source without increasing power consumption.
Implementation Method 1
Both of the first curved surface and the second curved surface are concave surfaces or convex surfaces. In a cross section perpendicular to the light incident surface and passing through the first curved surface and the second curved surface, the first curved surface and the cross section intersect in a first curved line, and the second curved surface and the cross section intersect in a second curved line. A curvature radius of the first curved line is greater than that of the second curved line.
Implementation Method 2
When a portion of light rays (such as light ray 112) provided by the light source 110 transmits to a surface 127a of the V-shaped light guide unit 127, the portion of light rays (such as light ray 112) would be totally reflected
Data Source
AI summary
A light guide plate has a light incident surface, a light emitting surface and a bottom surface. The bottom surface or the light emitting surface has a plurality of light guide units disposed thereon. Each of the light guide units has a first curved surface and a second curved surface connected with the first curved surface. Both of the first curved surface and the second curved surface are concave surfaces or convex surfaces. In a cross section perpendicular to the light incident surface and passing through the first curved surface and the second curved surface, the first curved surface and the cross section intersect in a first curved line, and the second curved surface and the cross section intersect in a second curved line. A curvature radius of the first curved line is greater than that of the second curved line.