Miniaturized Light-Emitting Device with Enhanced Efficiency
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Summary
Problems
Conventional light-emitting devices face challenges in miniaturization and reduction in thickness while maintaining light output efficiency, as they often require convex lenses, diffraction gratings, or shielding members that can decrease efficiency.
Innovation solutions
A light-emitting device with a first sealing material layer covering the light-emitting element and a second sealing material layer surrounding the first layer, where the refractive indices of the two layers are different, allowing for control of the radiation pattern without the need for additional components, enabling miniaturization and maintaining efficiency.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a convex lens is used to control the radiation pattern, then the radiation pattern can be controlled, but the miniaturization and reduction in thickness of the light-emitting device become difficult
Why choose this principle:
The patent changes the refractive index parameter of the sealing material layer to control the radiation pattern. By adjusting the refractive index of the sealing material to be higher than that of the surrounding medium, the radiation pattern can be controlled without requiring a convex lens, thereby enabling miniaturization and reduction in device thickness.
Principle concept:
If a diffraction grating is used to control the radiation pattern, then the radiation pattern can be controlled, but the light output efficiency decreases due to unused high-order diffracted light
Why choose this principle:
The patent uses refractive index parameter changes in the sealing material layer instead of diffraction gratings. This approach controls the radiation pattern through refraction rather than diffraction, utilizing all emitted light effectively and avoiding the loss of high-order diffracted light, thereby maintaining high light output efficiency.
Application Domain
Data Source
AI summary:
A light-emitting device with a first sealing material layer covering the light-emitting element and a second sealing material layer surrounding the first layer, where the refractive indices of the two layers are different, allowing for control of the radiation pattern without the need for additional components, enabling miniaturization and maintaining efficiency.
Abstract
A light-emitting device ( 1 ) having a base ( 10 ) and a light-emitting element ( 11 ) placed on the base ( 10 ) includes a first sealing material layer ( 12 ) covering the light-emitting element ( 11 ) and a second sealing material layer ( 13 ) surrounding a side surface of the first sealing material layer ( 12 ), wherein the refractive index of the first sealing material layer ( 12 ) and the refractive index of the second sealing material layer ( 13 ) are different from each other. The light-emitting device ( 1 ) is capable of controlling a radiation pattern from the light-emitting element ( 11 ) by controlling the refractive index of the first sealing material layer ( 12 ) and the refractive index of the second sealing material layer ( 13 ). This can facilitate the miniaturization and reduction in thickness of the light-emitting device ( 1 ), and prevent the decrease in a light output efficiency of the light-emitting device ( 1 ).