Light-emitting module reflective member for luminance uniformity
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Solution Overview
Problem
Existing light-emitting modules for planar light sources experience luminance unevenness due to variations in light distribution, which affects the performance and quality of displays using these modules.
Innovation Solution
A light-emitting module design that includes a light guide member with a through hole housing a light source unit, covered by a first light-transmissive member and topped with a reflective member having a refractive index lower than the resin member, where the reflective member's outer edge is outside the light source unit, helping to distribute light more evenly and reduce luminance inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source unit is disposed in a through hole of a light guide member, then light emission is achieved, but luminance unevenness occurs due to excessive brightness directly above the light source unit
Solution Approach 1:
The reflective member is positioned specifically above the light source unit with its outer edge extending beyond the light source unit's outer edge. This localized placement creates different optical properties in different regions: the reflective member area reflects and diffuses light to reduce excessive brightness, while other regions maintain direct light transmission, achieving local optimization of luminance distribution.
Solution Approach 2:
The reflective member acts as an intermediary element between the light source unit and the light guide member's first surface. It mediates the light by reflecting and diffusing the light from the light source unit, preventing direct light from causing excessive brightness and luminance unevenness while still allowing light to reach the light guide member.
2Manufacturing precision
If a reflective member with lower refractive index than the resin member is used, then light distribution is improved, but device complexity increases
Solution Approach 1:
The reflective member is designed with a specific refractive index parameter that is lower than the resin member's refractive index. This parameter change optimizes light reflection and diffusion properties, improving luminance uniformity. The refractive index difference creates effective light reflection at the interface without requiring complex additional structures.
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 effectively reduces luminance unevenness by inhibiting excessive brightness directly above the light source unit, improving the uniformity and efficiency of light emission, thereby enhancing the performance and quality of planar light sources.
Implementation Method 1
a reflective member disposed above the light source unit and disposed above the first light-transmissive member
Implementation Method 2
the reflective member includes a resin member and a reflector having a refractive index lower than a refractive index of the resin member
Data Source
AI summary
A light-emitting module includes a light guide member including a first surface, a second surface on an opposite side of the first surface, and a first through hole penetrating from the first surface to the second surface, a light source unit disposed in the first through hole, a first light-transmissive member disposed in the first through hole of the light guide member and covering the light source unit, and a reflective member disposed above the light source unit and disposed above the first light-transmissive member. In a plan view, an outer edge of the reflective member is located outside an outer edge of the light source unit, and the reflective member includes a resin member and a reflector having a refractive index lower than a refractive index of the resin member.