Hemispherical Lens and Spherical Particles for Compact Light Mixing
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Solution Overview
Problem
Existing self-luminous lighting devices face challenges in mixing light of different wavelengths in a small space, leading to larger device sizes and reduced efficiency.
Innovation Solution
A lighting device with self-luminous elements on a substrate, covered by a hemispherical lens structure and translucent spherical particles, which effectively mixes light colors by scattering and refracting light to produce a desired color in a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light mixing is performed in a small space using conventional methods, then device size is reduced, but light mixing efficiency deteriorates
Solution Approach 1:
The patent employs a hemispherical lens structure covering the light emitting elements. This curved surface configuration enables effective light mixing within a compact volume by refracting and redirecting light paths, achieving both small device size and high light mixing efficiency simultaneously
Solution Approach 2:
The patent introduces translucent spherical particles as an intermediary medium between the light emitting elements and the external environment. These particles facilitate light mixing by scattering and refracting light, enabling efficient color mixing in a small space without direct contact between light sources
2Volume of moving object
If multiple light sources are placed close together to mix colors, then device size is reduced, but light extraction efficiency deteriorates
Solution Approach 1:
The hemispherical lens structure with its curved surface configuration optimizes light extraction by reducing total internal reflection at the interface. This enables efficient light extraction even when multiple light sources are positioned closely together, maintaining both compact size and high extraction efficiency
Solution Approach 2:
The translucent spherical particles act as an intermediary that improves light extraction efficiency by scattering light at their interfaces. This scattering effect reduces waveguide modes and enables more light to escape from the device, even when light sources are densely packed
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 a small, lightweight lighting device that efficiently mixes multiple light colors, improving light extraction efficiency and reducing device size, suitable for use in liquid crystal display applications.
Implementation Method 1
a hemispherical lens structure formed on the substrate to cover the light emitting elements
Implementation Method 2
a plurality of translucent spherical particles covering a surface of the lens structure
Data Source
AI summary
A lighting device includes a plurality of self-luminous elements formed on a substrate and emitting different wavelengths of light from each other, a hemispherical lens structure formed on the substrate to cover the self-luminous elements, and a plurality of translucent spherical particles covering a surface of the lens structure. Light emitted from the self-luminous elements passes through the lens structure and enters the translucent spherical particles where its direction is largely inclined to scatter due to a difference in refractive index between the translucent spherical particles and air. Consequently, different wavelengths of light from the self-luminous elements are mixed to produce a desired color of light.