Planar Light Source With Through Holes And Intermediary Diffuser
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Planar light sources with combined light-emitting elements and light guide members often suffer from brightness unevenness due to inefficient light distribution and scattering.
Innovation Solution
A planar light source configuration featuring a light guide member with through holes for light-emitting units, a wavelength conversion member covering the light-emitting element, and a light-transmissive member between the light source unit and the light guide member, along with a light adjustment member to optimize light entry and distribution, reducing brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide member with through holes and light sources is used, then light emission is achieved, but brightness unevenness occurs
Solution Approach 1:
A light-transmissive member is introduced as an intermediary component between the light source unit and the light guide member. This member includes a diffusing layer that scatters and redistributes the light before it enters the light guide, acting as a mediator to smooth out brightness variations and achieve more uniform illumination across the light guide surface.
Solution Approach 2:
The light-transmissive member is positioned specifically at the light source location within the through hole, targeting the local area where light is generated. By applying the diffusing function locally at the light source rather than uniformly across the entire light guide, the solution addresses brightness unevenness precisely where it originates.
2Volume of moving object
If light sources are disposed in through holes of light guide member, then compact structure is achieved, but light extraction efficiency is reduced
Solution Approach 1:
The light-transmissive member serves as a mediator that optimizes the interface between the compact light source unit and the light guide member. It ensures efficient light coupling and extraction while maintaining the compact through-hole structure, preventing light loss that would otherwise occur at the interface.
Solution Approach 2:
The refractive index of the light-transmissive member is specifically controlled to be between 1.3 and 1.7, which is lower than the light guide member's refractive index. This parameter optimization enables better light extraction efficiency from the compact light source unit into the light guide member, resolving the trade-off between compactness and efficiency.
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 configuration enhances light extraction efficiency and reduces brightness unevenness by ensuring efficient light entry into the light guide member and controlled light distribution, resulting in a more uniform illumination.
Implementation Method 1
a wavelength conversion member that covers an upper surface and a lateral surface of the light-emitting element
Implementation Method 2
a light-transmissive member disposed between the light source unit and the light guide member in the through hole
Implementation Method 3
a light adjustment member disposed on the light source unit and the light-transmissive member
Data Source
AI summary
A planar light source includes a support member; a light guide member including a first surface located proximate to an upper surface of the support member, a second surface opposite to the first surface, and a through hole extending from the first surface to the second surface; a light source unit including a light-emitting element and a wavelength conversion member that covers an upper surface and a lateral surface of the light-emitting element and disposed on the support member at a position of the through hole; a light-transmissive member disposed between the light source unit and the light guide member in the through hole; and a light adjustment member disposed on the light source unit and the light-transmissive member. An upper surface of the wavelength conversion member of the light source unit is located higher than the second surface of the light guide member.