Curved Reflecting Microstructures for LCD Light Guiding Plates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing backlight modules for liquid crystal display (LCD) devices have low light usage rates for vertical light sources, as the prism structures on light-guiding plates are ineffective in maximizing the utilization of positive light.
Innovation Solution
A light-guiding plate design featuring a main unit with a light-receiving, light-reflecting, and light-projecting surface, incorporating reflecting microstructures with specific curved surfaces and control points that optimize light reflection and projection, increasing light-guiding efficiency and usage rates without the need for optical films or dual-layer plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If prism structures are formed on the bottom portion of the light-guiding plate, then the light-projecting direction can be adjusted, but the light usage rate of the positive light source cannot be effectively increased
Solution Approach 1:
The patent applies curvature by forming reflecting microstructures with curved reflecting surfaces on the light-guiding plate. These curved surfaces (including concave and convex shapes) effectively reflect and guide positive light from the light source, significantly increasing the light usage rate compared to traditional flat prism structures. The curved geometry enables better light control and redirection while maintaining structural simplicity.
Solution Approach 2:
The patent changes the geometric parameters of the reflecting structures by introducing microstructures with specific curvature radii, depths, and spacing. By optimizing these parameters (such as the curvature radius R1 and R2, depth H1 and H2, and spacing D1 and D2), the light-guiding efficiency is maximized without requiring complex multi-layer structures or additional optical films.
2Productivity
If optical films and dual-layer light-guiding plates are used, then light-guiding efficiency can be improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the light-guiding function and the light-reflecting function into a single integrated light-guiding plate structure. By forming reflecting microstructures directly on the light-guiding plate, it eliminates the need for separate optical films and dual-layer configurations, thereby simplifying the overall device structure while maintaining high light-guiding efficiency.
Solution Approach 2:
The light-guiding plate is designed to perform multiple functions simultaneously: it guides light from the source, reflects light through its microstructures, and projects light in the desired direction. This multi-functional design replaces what would traditionally require multiple separate components (light-guiding plates, reflectors, optical films), reducing device complexity and manufacturing steps.
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 design effectively increases light-guiding efficiency and light usage rates by minimizing projection angles and enhancing luminance, with the optimal weighting factor range between 0.1 and 10, achieving up to 7.1 times the light usage rate of prior art configurations.
Implementation Method 1
The reflecting unit includes a plurality of reflecting microstructures formed on the light-reflecting surface of the main body, wherein each reflecting microstructure has a first reflecting curved surface
Data Source
AI summary
The main body of the main unit has a light-receiving surface, a light-reflecting surface, and a light-projecting surface. The reflecting unit includes a plurality of reflecting microstructures formed on the light-reflecting surface. Each reflecting microstructure has a first reflecting curved surface, and the first reflecting curved surface of each reflecting microstructure has a first reflecting curved line shown on the lateral surface thereof. The first reflecting curved line of each first reflecting curved surface is substantially composed of a first base point as an initial point on the first bottom portion of the light-reflecting surface, a second base point as an end point on the second bottom portion of the light-reflecting surface, and a first curve track connected from the first base point to the second base point and passing through a plurality of first trajectory points.