Light-Emitting Module with Bent Substrate for LED Heat Management
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Solution Overview
Problem
Existing light-emitting diode (LED) based light source apparatuses for flat panel displays face challenges with low light-emitting efficiency due to heat generation, increased manufacturing costs with multiple LEDs, and luminance uniformity issues, necessitating improved heat management and reduced LED count.
Innovation Solution
A light-emitting module featuring a light guide plate with strategically positioned point light sources and a substrate with a heat-radiating plate, where the substrate is bent to face cross-sectional surfaces and side surfaces, enhancing heat radiation and luminance uniformity using a serrated structure and optimized LED placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs are used as light sources, then luminance can be increased, but manufacturing costs increase and luminance uniformity decreases
Solution Approach 1:
The invention divides the light guide plate into multiple sections with different refractive indices or optical properties. By segmenting the light guide structure rather than using multiple LEDs, the patent achieves improved luminance distribution and uniformity while reducing the number of light sources needed, thereby lowering manufacturing costs.
Solution Approach 2:
The patent applies local quality by creating regions with different optical characteristics within the light guide plate. Specific areas have modified refractive indices or optical densities to control light distribution, allowing uniform luminance output without requiring multiple LEDs across the entire structure.
2Illumination intensity
If multiple LEDs are used as light sources, then luminance can be increased, but luminance uniformity decreases
Solution Approach 1:
The light guide plate is segmented into multiple optical zones with different light transmission or reflection properties. This segmentation allows precise control over light distribution patterns, ensuring uniform luminance across the display area while maintaining high overall luminance levels.
Solution Approach 2:
The patent changes optical parameters such as refractive index, optical density, or surface geometry at different locations within the light guide plate. By adjusting these parameters locally, the invention achieves uniform luminance distribution without the need for multiple LEDs, thereby improving luminance uniformity.
3Use of energy by moving object
If LEDs are used as light source, then power consumption is reduced, but heat generation occurs reducing light-emitting efficiency
Solution Approach 1:
The patent converts the harmful heat generated by LEDs into a beneficial element by incorporating heat-reflecting or heat-managing optical structures within the light guide plate. The heat that would normally reduce LED efficiency is redirected or managed through the optical design, maintaining light-emitting efficiency while preserving the low power consumption advantage of LEDs.
4Ease of operation
If LEDs are mounted on flexible printed circuit film at side surface, then light can be provided, but number of LEDs must be increased
Solution Approach 1:
The light guide plate is designed to serve multiple functions simultaneously: it guides light from a minimal number of LEDs, distributes luminance uniformly across the display area, and manages heat distribution. This multi-functionality eliminates the need for numerous LEDs mounted on flexible circuits, reducing component quantity while maintaining effective light provision.
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 enhances light-emitting efficiency, reduces the number of LEDs required, improves luminance uniformity, and effectively manages heat, thereby decreasing manufacturing costs and power consumption while maintaining desired luminance levels.
Implementation Method 1
a point light source mounted on the substrate to emit light to the cross-sectional surface
Implementation Method 2
a light guide plate which guides emitted light using a light guide plate to form surface light
Implementation Method 3
heat is effectively irradiated so that the temperature of the LED and the temperature of a peripheral portion adjacent to the LED are maintained at no more than a predetermined temperature
Data Source
AI summary
A light-emitting module includes a light guide plate and a light source unit in accordance with an embodiment. The light guide plate include an upper surface, a lower surface facing the upper surface, a plurality of side surfaces connecting the upper surface and the lower surface, and a cross-sectional surface connected to at least one of the side surfaces. The light source unit includes a substrate disposed in correspondence with the cross-sectional surface and a point light source mounted on the substrate to emit light to the cross-sectional surface. Thus, light-emitting efficiency may be enhanced and the arrangement of point light sources may be optimized, so that a required amount of emitted light may be obtained using a small number of the point light sources. In addition, uniformity of luminance and heat-radiating efficiency may also be enhanced.