Light Emitting Module with Integrated Light Guide Plate
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Solution Overview
Problem
Existing light source devices using light emitting elements struggle to achieve sufficient thinning due to the required distance between the mounting substrate and diffusion plate, which limits their thickness reduction.
Innovation Solution
A light emitting module comprising a light guide plate with optically functional portions and light emitting elements mounted on its surface, allowing for reliable thinning by reducing misalignment and enhancing optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If light emitting elements are mounted on a mounting substrate with a diffusion plate disposed thereover, then light emission function is achieved, but the distance between mounting substrate and diffusion plate must be larger than lens member thickness, preventing sufficient thinning
Solution Approach 1:
The mounting substrate and light guide plate are merged into a single integrated structure. The light guide plate serves both as the mounting substrate for the light emitting elements and as the diffusion plate, eliminating the need for separate components and reducing overall thickness while maintaining optical uniformity through integrated design
Solution Approach 2:
The light guide plate performs multiple functions simultaneously: it serves as the mounting substrate for light emitting elements, acts as the diffusion plate for uniform light distribution, and provides the structural framework for the entire light source device, thereby reducing the number of components and enabling thinning
2Manufacturing precision
If light emitting elements are mounted on a mounting substrate, then electrical connection is achieved, but misalignment between light emitting elements and optically functional portions occurs, degrading optical properties
Solution Approach 1:
Optically functional portions such as lens members or reflective patterns are pre-formed on the light guide plate before mounting the light emitting elements. This preliminary formation ensures precise alignment positions are already established, guiding the light emitting elements to be mounted accurately without requiring complex alignment procedures during assembly
Solution Approach 2:
The light guide plate features locally differentiated regions with specific optical properties (such as varying refractive indices, reflective patterns, or lens structures) at precise locations corresponding to each light emitting element. This local optimization ensures each light emitting element aligns with its designated optically functional portion, maintaining high manufacturing precision
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 enables a light emitting module with reduced thickness, improved optical uniformity, and minimized unevenness in luminance, suitable for direct-lit liquid crystal display devices.
Implementation Method 1
a light guide plate that comprises a first main surface serving as a light-emitting surface and a second main surface opposite to the first main surface
Implementation Method 2
optically functional portions provided on the first main surface of the light guide plate
Data Source
AI summary
A method of manufacturing a light emitting module according to the present disclosure includes: preparing a light guide plate that comprises a first main surface serving as a light-emitting surface and a second main surface opposite to the first main surface; respectively providing light emitting elements on the second main surface so as to correspond to each of a plurality of optically functional portions provided on the first main surface of the light guide plate; and forming wires electrically connecting the plurality of light emitting elements.