Light Source Backlight Module Optical Uniformity
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Solution Overview
Problem
Conventional backlight modules suffer from unfavorable optical uniformity due to excessive light concentration and light leakage, which affects the performance of liquid crystal displays (LCDs).
Innovation Solution
A light source design featuring a carrier with solid-state light-emitting devices, a light-incoupling component with a through hole, a first reflector covering the hole, and second reflectors on the side surfaces, which directs light uniformly from the top surface, reducing light leakage and improving optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light sources are adhered directly to the light-incident surface of the LGP, then the structure is simple, but light distribution uniformity deteriorates due to excessive light concentration and light leakage
Solution Approach 1:
The patent introduces a light-incoupling component as an intermediary element between the light source and the LGP. This component includes a through hole that receives the light source, allowing light to enter from the side and exit uniformly from the top surface. The light-incoupling component mediates the light transmission process, preventing direct adhesion of light sources to the LGP and thereby solving both the light concentration and light leakage problems while maintaining structural simplicity.
2Ease of manufacture
If conventional light sources are used with direct adhesion, then manufacturing is easy, but optical uniformity deteriorates
Solution Approach 1:
The light-incoupling component serves as a manufacturable intermediary structure that can be easily integrated into the backlight module. The through hole design allows for straightforward assembly of light sources, while the reflective layer and light-guiding structure ensure uniform optical output. This approach maintains ease of manufacture by using simple geometric features and standard assembly processes.
Solution Approach 2:
The patent changes the light entry dimension by introducing a through hole that allows light to enter from the side rather than from above. This dimensional change in light coupling geometry enables uniform light distribution across the LGP surface while maintaining ease of manufacture through simple structural modifications.
3Illumination intensity
If light sources are positioned to maximize brightness, then illumination intensity improves, but light leakage increases
Solution Approach 1:
The light-incoupling component acts as a mediator that controls light propagation paths. The through hole geometry and reflective layer work together to guide light from the side-entry position to uniform top-surface emission, preventing light leakage while maintaining high brightness output.
Solution Approach 2:
The patent converts the potential harmful effect of light leakage into a beneficial feature by using the reflective layer to redirect otherwise lost light paths. The reflective layer captures light that would otherwise leak and redirects it through the light-incoupling component, transforming a harmful effect into additional useful light output.
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 achieves better light distribution uniformity and minimizes light leakage, enhancing the optical performance of the backlight module and LCD displays.
Implementation Method 1
a plurality of solid-state light-emitting devices... Light emitted from the solid-state light-emitting devices
Implementation Method 2
The first reflector covers the through hole. The second reflectors are configured on the side surfaces. Light emitted from the solid-state light-emitting devices enters the light-incoupling component via a sidewall of the through hole
Data Source
AI summary
A light source includes a carrier, a plurality of solid-state light-emitting devices, a plate photo-coupler, a first reflector, and a plurality of second reflectors. The solid-state light-emitting devices and the light-incoupling component are configured on the carrier. The light-incoupling component has a bottom surface, a top surface, a plurality of side surfaces adjoining the bottom surface and the top surface, and a through hole extending from the bottom surface to the top surface. The solid-state light-emitting devices are located in the through hole. The first reflector covers the through hole. The second reflectors are configured on the side surfaces. Light emitted from the solid-state light-emitting devices enters the light-incoupling component via a sidewall of the through hole and leaves the light-incoupling component via the top surface thereof.