Light Source Module with Total-Reflection Induction Layer for LCD Backlight
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Solution Overview
Problem
Liquid crystal display (LCD) backlight units face issues with non-uniform light distribution due to point light sources, leading to hot-spot phenomena and increased heat generation when more LEDs are used to compensate, which raises costs and reliability concerns.
Innovation Solution
A light source module with a substrate, light barriers, and total-reflection induction layers that reflect non-incident light onto a light guide plate, improving light distribution and heat radiation, thereby reducing the number of needed light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of LEDs is increased to increase the amount of light incident on the light guide plate, then the light incident efficiency is improved, but heat generation increases and cost increases
Solution Approach 1:
A reflective layer is introduced as an intermediary component between the LEDs and the light guide plate. This reflective layer redirects light that would otherwise be lost toward the light guide plate, improving light incident efficiency without requiring additional LEDs, thereby avoiding increased heat generation and cost.
Solution Approach 2:
The invention changes the optical parameters of the system by introducing a reflective layer with specific reflectivity characteristics. This modifies the light distribution pattern and increases the amount of light incident on the light guide plate without changing the number of LEDs, thus maintaining heat generation at acceptable levels while improving productivity.
2Productivity
If the number of LEDs is increased to increase the amount of light incident on the light guide plate, then the light incident efficiency is improved, but cost increases
Solution Approach 1:
A reflective layer is introduced as an intermediary component between the LEDs and the light guide plate. This reflective layer redirects light that would otherwise be lost toward the light guide plate, improving light incident efficiency without requiring additional LEDs, thereby avoiding increased heat generation and cost.
Solution Approach 2:
The reflective layer serves as a cost-effective solution compared to adding more LEDs. It is a relatively inexpensive component that achieves the desired improvement in light incident efficiency without the high cost associated with increasing the number of LED packages.
3Device complexity
If point light sources are used, then device complexity is reduced, but light distribution uniformity deteriorates causing hot-spot phenomenon
Solution Approach 1:
A reflective layer is introduced as an intermediary to modify the light distribution pattern. This layer redirects light from point sources to create a more uniform illumination pattern on the light guide plate, reducing hot-spot phenomena while maintaining the simplicity of using point light sources.
Solution Approach 2:
The reflective layer is strategically positioned and designed with specific local properties to address the non-uniform light distribution. By controlling the reflectivity and geometry of the reflective layer, the invention creates uniform light distribution without changing the point light source configuration, thus maintaining structural simplicity while improving stability.
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
Enhances light incident efficiency and reduces heat generation and costs by ensuring uniform light distribution and effective heat management without additional heat radiation structures.
Implementation Method 1
a total-reflection induction layer on the plurality of light source packages, the total-reflection induction layer having a flat surface opposite the plurality of light source packages
Implementation Method 2
The light in the form of a point light source is converted into light in the form of a planar light source by means of the light guide plate to then be emitted
Data Source
AI summary
The present disclosure provides a light source module that includes a substrate, a plurality of light barriers on a surface of the substrate and spaced apart from each other, a plurality of light source packages on the surface of the substrate and positioned between the plurality of light barriers, and a total-reflection induction layer on the plurality of light source packages. The total-reflection induction layer has a flat surface opposite the plurality of light source packages. According to the various embodiments provided herein, the amount of light incident on a light guide plate increases, and a heat radiation effect is improved.