Light Guide Plate Ridge Microstructures for Optical Film Reduction
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Solution Overview
Problem
Existing light source modules experience energy loss due to interface reflections and refractions between optical films, leading to decreased light extraction efficiency.
Innovation Solution
A light source module with a light guide plate featuring ridge-shaped microstructures on its bottom surface, where the microstructures have a light-facing surface and a first included angle between 30 to 70 degrees with the bottom surface, reducing the need for prism sheets and enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple optical films (diffusion sheets and prism sheets) are installed to enhance light emitting uniformity and direct light toward normal direction, then light emitting uniformity is improved, but interface reflections and refractions between optical films cause energy loss and decrease light extraction efficiency
Solution Approach 1:
The patent combines the functions of multiple optical films into a single light guide plate with integrated microstructures. The bottom surface features both diffusion microstructures (for uniformity) and light directing microstructures (for normal direction emission), eliminating the need for separate diffusion sheets and prism sheets, thereby reducing interface reflections and refractions
Solution Approach 2:
The light guide plate serves multiple functions simultaneously: it diffuses light for uniformity, directs light toward the normal direction, and reduces optical losses. The microstructures on the bottom surface perform both diffusion and light directing functions in one component
2Illumination intensity
If multiple optical films are installed to achieve desired optical effects, then light emitting uniformity is enhanced, but the number of optical films increases leading to higher costs and more interface reflections
Solution Approach 1:
Multiple optical films are merged into a single light guide plate with integrated microstructures on the bottom surface that provide both diffusion and light directing functions, reducing the total number of components from multiple separate films to one unified structure
Solution Approach 2:
The light guide plate performs multiple optical functions simultaneously - diffusion for uniformity and light directing for normal emission - that previously required separate specialized films, thereby simplifying the overall optical system
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 enhances light extraction efficiency by directing light towards the normal direction, reducing the number of optical films required, which in turn decreases light loss and costs, while improving light emitting uniformity.
Implementation Method 1
interface reflections and refractions occurring between the optical films
Implementation Method 2
interface reflections and refractions occurring between the optical films
Data Source
AI summary
A light source module includes a light source and a light guide plate. The light guide plate has a light entrance surface, a light exit surface, and a bottom surface. The light entrance surface faces the light source and is located between the light exit surface and the bottom surface. The bottom surface is opposite to the light exit surface and has a plurality of microstructures. The microstructures are a plurality of ridge-shaped microstructures formed in the light guide plate. Each of the microstructures includes a light-facing surface, and a first included angle between the light-facing surface and the bottom surface is 30 degrees to 70 degrees.