Light Emitting Structure With Recessed Reflector for Uniform Appearance
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Solution Overview
Problem
Conventional light emitting devices either have an unfavorable appearance due to visible colors during non-light-emission periods or lack sufficient contrast in light-emission regions, affecting their aesthetic and functional performance.
Innovation Solution
A light emitting device design featuring a light emitting element, a light guiding member, and a reflecting member, where the wavelength conversion member is recessed and the reflecting member is positioned within this recess, allowing the wavelength conversion member's color to dominate the upper surface during non-emission and enhancing contrast during emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-reflective white member is provided around the fluorescent plate, then light extraction efficiency is improved, but the appearance becomes unfavorable with multiple colors visible during non-light-emission period
Solution Approach 1:
The patent applies local quality by providing the light-reflective member only in specific regions (lateral surfaces and bottom surface) while leaving the upper surface without such members. This allows the upper surface to maintain uniform fluorescent plate color appearance, while still achieving improved light extraction through reflection at other surfaces.
2Shape
If no light reflecting member is provided on lateral surface of wavelength conversion member, then appearance is uniform with single color, but light extraction efficiency decreases
Solution Approach 1:
The patent segments the light-reflective member provision into different spatial regions: the upper surface is kept free of reflective members to maintain uniform appearance, while lateral surfaces and bottom surface are equipped with reflective members to enhance light extraction efficiency. This spatial segmentation resolves the contradiction between appearance and performance.
3Area of stationary object
If the light emitting region is widened to improve illumination coverage, then the contrast of lightness and darkness decreases
Solution Approach 1:
The patent applies local quality by concentrating light-reflective members at specific locations (lateral and bottom surfaces) rather than uniformly distributing them. This creates localized light concentration effects that maintain high contrast in the light emitting region while still providing adequate illumination coverage.
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 ensures the wavelength conversion member's color is visible over the entire upper surface during non-emission, and large contrast is achieved in light-emission regions, improving both appearance and functionality.
Implementation Method 1
a wavelength conversion member, wherein the wavelength conversion member is provided with a recess between an outer lateral surface of the wavelength conversion member and the light guiding member
Implementation Method 2
a reflecting member, wherein the reflecting member is provided in the recess
Data Source
AI summary
A light emitting device includes a light emitting element, a light guide member, a reflecting member, a wavelength conversion member. The light emitting element has a light emitting surface and lateral surfaces. The light guiding member is provided on at least a portion of the lateral surfaces of the light emitting element. The reflecting member is provided on the lateral surface of the light emitting element with the light guiding member interposed therebetween. The wavelength conversion member is provided on the light emitting surface of the light emitting element, the light guiding member and the reflecting member. The wavelength conversion member is provided with a recess between an outer lateral surface of the wavelength conversion member and the light guiding member. The reflecting member is provided in the recess.