Light-emitting device light-shielding body luminous intensity control
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Solution Overview
Problem
Existing light-emitting devices face challenges in controlling luminous intensity and achieving uniform luminance and chromaticity due to the large variation in luminous intensity with changes in pigment mixture ratios, particularly with the use of black-based pigments, which also affect the design characteristics.
Innovation Solution
A light-emitting device design featuring a light-shielding body with light-shielding particles formed only on the surface opposite to the substrate, allowing for adjustable luminous intensity by controlling the concentration of light-shielding particles, while maintaining uniform chromaticity and design characteristics through selective light absorption and scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If black-based pigments are mixed to the covering member with phosphor particles, then luminous intensity can be adjusted, but the luminous intensity changes too much with small changes in pigment mixture ratio
Solution Approach 1:
The light-shielding function is segmented from the sealing resin and implemented by a separate light-shielding body. This body contains light-shielding particles (such as metal particles or carbon particles) dispersed in a resin, allowing independent control of light shielding properties without affecting the sealing function. The light-shielding body can be positioned between the light-emitting element and the sealing resin, enabling precise adjustment of luminous intensity through particle concentration and distribution control.
Solution Approach 2:
A light-shielding body acts as an intermediary component between the light-emitting element and the sealing structure. This intermediate layer with light-shielding particles provides a buffer that selectively absorbs or blocks light, enabling fine-tuned control of luminous intensity. The light-shielding body serves as a mediator that decouples the relationship between sealing resin composition and light output control.
2Illumination intensity
If black-based pigments are added to the covering member, then luminous intensity can be controlled, but uniform luminance and chromaticity across the light emission surface become difficult to achieve
Solution Approach 1:
The light-shielding particles are distributed with controlled spatial variation to create local differences in light shielding. By adjusting particle concentration, size, and distribution density in different regions, uniform luminance and chromaticity across the entire light emission surface can be achieved. The light-shielding body allows localized adjustment of light properties without requiring black pigments throughout the entire sealing resin.
3Illumination intensity
If black-based pigments are mixed into the covering member, then luminous intensity can be adjusted, but the design characteristic (light emission surface color) is altered
Solution Approach 1:
The light-shielding function is separated from the sealing and design functions. The light-shielding body containing light-shielding particles handles luminous intensity control, while the sealing resin maintains its original composition and aesthetic appearance. This segmentation allows the light emission surface to retain its original design characteristics without being contaminated by black pigment mixing.
Solution Approach 2:
The light-shielding body serves as an intermediary that performs light control functions without affecting the visual appearance of the sealing resin. Positioned between the light-emitting element and the external environment, it adjusts luminous intensity while leaving the design characteristics of the light emission surface intact.
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 enables precise control over luminous intensity and uniform chromaticity, improving the reproducibility and yield of light-emitting devices with stable luminous intensity and reduced dependence on angle visibility, without altering the device's design appearance.
Implementation Method 1
a light-shielding body which is formed only on a surface of the light-emitting element opposite to said first substrate and includes a material including light-shielding particles
Implementation Method 2
allowing for adjustable luminous intensity by controlling the concentration of light-shielding particles, while maintaining uniform chromaticity and design characteristics through selective light absorption and scattering
Data Source
AI summary
A light-emitting device of the invention includes, a first substrate; a light-emitting element mounted on the first substrate and includes a second substrate and a semiconductor structure including a light-emitting layer; and a light-shielding body which is formed only on a surface of the light-emitting element opposite to the first substrate and includes a material including light-shielding particles.