Light Guide Plate Cavity Structure for Brightness and Energy Loss
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Solution Overview
Problem
In liquid crystal displays, the light guide plate made of polymethyl methacrylate results in significant light energy loss due to absorption, leading to decreased brightness and increased manufacturing costs, making the products less competitive.
Innovation Solution
A light guide plate with a cavity structure and curved surfaces is designed, where incident light is refracted and reflected within the cavity to reduce absorption and enhance light exit, manufactured using injection molding or extrusion molding techniques with specific mold configurations to form the cavity and curved surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate made of polymethyl methacrylate is used, then the light guide plate can be manufactured with good optical properties, but significant light energy loss occurs due to absorption, leading to decreased brightness
Solution Approach 1:
The light guide plate is segmented into multiple regions with different cavity structures. The plate includes first cavities and second cavities with different shapes and depths, creating localized optical pathways that reduce absorption losses by dividing the light transmission path into multiple smaller segments rather than one long path through uniform material.
Solution Approach 2:
Different regions of the light guide plate are given different local optical properties through varying cavity configurations. The first cavities and second cavities have different shapes and depths, creating localized areas with optimized light reflection and refraction characteristics to minimize absorption losses in specific high-loss regions.
2Illumination intensity
If optical sheets with gain are added to compensate for light energy loss, then brightness can be maintained, but manufacturing cost increases and product competitiveness decreases
Solution Approach 1:
The invention merges the light guiding function and the light compensation function into a single integrated structure. The cavity structures in the light guide plate simultaneously perform light reflection, refraction, and compensation for absorption losses, eliminating the need for separate optical sheets with gain and reducing manufacturing complexity.
Solution Approach 2:
The light guide plate is designed with multi-functionality, serving both as the primary light guiding component and as the light compensation mechanism. The cavity structures perform multiple optical functions including reflection, refraction, and absorption compensation within a single component, reducing the total number of parts and manufacturing steps.
3Loss of energy
If a cavity structure with curved surfaces is introduced, then light energy loss is reduced and brightness is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention introduces curved surface cavities with spherical or hemispherical shapes into the light guide plate. These curved surfaces optimize light reflection and refraction angles, reducing absorption losses by directing light more efficiently through the plate. The curved geometry naturally focuses and redirects light paths without requiring additional optical components.
Solution Approach 2:
The invention optimizes specific parameters of the cavity structures, including the depth-to-diameter ratio of the first cavities and the size distribution of the second cavities. By carefully controlling these geometric parameters, the design achieves optimal light transmission efficiency while maintaining manufacturability through standardized molding processes.
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 cavity structure reduces light energy loss, increases picture brightness, lowers manufacturing costs, and improves product competitiveness by enhancing light utilization and uniformity.
Implementation Method 1
incident light from the incident surface exits the exiting surface after refracted and/or reflected by the cavity
Implementation Method 2
incident light from the incident surface exits the exiting surface after refracted and/or reflected by the cavity
Data Source
AI summary
The present invention provides a light guide plate and a method and a mold for manufacturing the same. The light guide plate comprises at least one incident surface, an exiting surface and a bottom surface, the exiting surface and bottom surface being disposed facing to each other and both being connected to the incident surface, the light guide plate having a cavity formed therein, wherein light incident from the incident surface exits the exiting surface after refracted and/or reflected by the cavity. With the light guide plate, light energy loss can be reduced and brightness of pictures can be improved.