Through-Hole Light-Emitting Structure for Higher Emission Directivity
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Solution Overview
Problem
Conventional light-emitting devices with light emitters having non-uniform radiant intensity distributions suffer from low directivity of emission light due to inefficient light reflection within the device structure.
Innovation Solution
A light-emitting device design featuring a first substrate and a second substrate with a through-hole that reflects light having maximum radiant intensity multiple times on its inner peripheral surface, increasing the directivity of emitted light by optimizing the space between the substrates and the shape of the through-hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional light-emitting device structure is used, then the device is simple in structure, but the directivity of emission light is low
Solution Approach 1:
The device is divided into two separate substrates (first substrate and second substrate) with a through-hole structure, segmenting the light path and enabling multiple reflections to improve directivity while maintaining manageable structural complexity
Solution Approach 2:
The through-hole extends in the vertical dimension between substrates, creating a three-dimensional light reflection path that enhances directivity by utilizing the vertical space for multiple reflections rather than relying solely on planar structures
2Illumination intensity
If light reflection is increased to improve directivity, then the front intensity increases, but the device structure becomes more complex
Solution Approach 1:
The inner peripheral surface of the through-hole itself serves as the reflective surface, utilizing the existing structural geometry to provide multiple reflections without requiring additional reflective components or coatings
Solution Approach 2:
The through-hole structure simultaneously serves as a structural element connecting the two substrates and as an optical element providing multiple light reflections, achieving dual functionality without increasing overall device complexity
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 design enhances the directivity of emission light, achieving up to 2 to 9 times more front intensity compared to devices without the second substrate, with improved luminance and image quality in display applications.
Implementation Method 1
The through-hole is configured to reflect the light having the maximum radiant intensity two or more times on an inner peripheral surface of the through-hole
Data Source
AI summary
A light-emitting device includes a first substrate including a first surface, a second substrate including a second surface facing the first surface, a third surface opposite to the second surface, and a through-hole extending from the second surface to the third surface, and a light emitter located on a portion of the first surface exposed in the through-hole in a plan view. The light emitter emits light having a maximum radiant intensity in a radiant intensity distribution toward the third surface. The through-hole reflects the light having the maximum radiant intensity twice or more times on an inner peripheral surface of the through-hole. The light emitting device includes a space between the first surface and the second surface.