Miniature Elements on LED Chips for Uniform Light Mixing
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Solution Overview
Problem
Conventional light-emitting devices with red, green, and blue LED chips suffer from non-uniform light mixing, resulting in a small effective white-light area and poor white-light mixing effect due to asymmetric irradiation areas and scattered light, leading to low optical application efficiency.
Innovation Solution
The light-emitting device incorporates a package housing with a recess and miniature elements, such as triangular pyramids, square-based pyramids, or cones, on each light-emitting diode chip to control and direct light output, ensuring uniform light distribution and reducing scattering within the package housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If red, green, and blue LED chips are arranged in a triangular or linear form in the package housing, then the device can output white light by mixing light from the three LED chips, but the light output is scattered by the inner wall of the package housing, forming asymmetric irradiation areas and causing a non-uniform light mixing effect
Solution Approach 1:
The patent introduces a light guide plate as an intermediary component between the LED chips and the package housing inner wall. The light guide plate receives light from the LED chips and guides it to exit through its side surface, preventing direct scattering off the package housing inner wall. This mediator transforms the asymmetric scattered light into a more uniform light distribution pattern.
Solution Approach 2:
The patent changes the light output geometry by using the light guide plate to redirect light from a point-source-like emission from LED chips into a planar emission from the side surface of the light guide plate. This dimensional transformation from point sources to a planar emission surface creates more symmetric and uniform irradiation areas.
2Area of stationary object
If the light output from the LED chips is scattered by the inner wall of the package housing, then the light mixing area is formed, but the effective mixed white-light area is small and the light color is not uniform
Solution Approach 1:
The light guide plate serves as a mediator that collects light from the LED chips and redistributes it uniformly across its side surface. This intermediary structure increases the effective light mixing area by spreading light over a larger surface area while maintaining color uniformity through the guiding and diffusing action of the light guide plate.
Solution Approach 2:
The patent changes the spatial distribution parameters of light by using the light guide plate to transform concentrated light from LED chips into a more uniformly distributed light field. The light guide plate modifies light propagation parameters, creating a larger and more uniform illumination area with consistent color characteristics.
3Ease of manufacture
If the light output does not possess directionality and is scattered, then the LED chips can be simply arranged in the package housing, but the efficiency of optical application is low
Solution Approach 1:
The light guide plate acts as a mediator that maintains manufacturing simplicity by providing a straightforward assembly process where LED chips are mounted on a circuit board and the light guide plate is positioned to receive their light. Despite this simple structure, the light guide plate significantly improves optical application efficiency by directing and uniformizing light distribution.
Solution Approach 2:
The light guide plate performs multiple functions: it collects light from LED chips, guides light propagation, redistributes light uniformly, and provides a mounting structure for the LED chips. This multi-functionality achieves high optical efficiency without complicating the manufacturing process.
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
This configuration enhances the effective mixed white-light area and achieves a uniform white-light mixing effect, improving the optical application efficiency and utility of the light-emitting device.
Implementation Method 1
Light from the light-emitting element is output to the exterior of the recess in a predetermined direction by adjustment of the miniature elements
Implementation Method 2
Light from the light-emitting element is output to the exterior of the recess in a predetermined direction by adjustment of the miniature elements
Data Source
AI summary
A light-emitting device includes a package housing, at least one light-emitting element, a plurality miniature elements, and a package filler. The package housing includes a recess. The light-emitting element is disposed in the recess. The miniature elements are formed on the light-emitting element. Light from the light-emitting element is output to the exterior of the recess in a predetermined direction by adjustment of the miniature elements. The package filler is filled in the recess and covers the light-emitting element and miniature elements.