Light Guide Element Homogeneous Color Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
LEDs have a lower color rendering index (CRI) compared to traditional light sources, limiting their ability to accurately render colors, especially when used as replacements for incandescent or fluorescent lamps, due to their narrow spectrum.
Innovation Solution
A light-emitting element is used to distribute light from additional LEDs, which can emit different colors, acting as a light guide to achieve homogeneous mixing and enhance the CRI, requiring fewer colored LEDs while maintaining uniform light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If differently colored LEDs are distributed on the board to change the spectrum and increase CRI, then the color rendering index is improved, but the device complexity and manufacturing effort increase significantly
Solution Approach 1:
The patent introduces a light guide element as an intermediary between the white light LEDs and the colored LEDs. This light guide serves multiple functions: it distributes light from both white and colored LEDs, enables homogeneous mixing of different wavelengths, and simplifies the overall arrangement by allowing fewer colored LEDs to achieve the desired spectrum modification without requiring complex distributed arrangements
Solution Approach 2:
The light guide element performs multiple functions simultaneously: it acts as a light distribution medium for white light LEDs, serves as a light guide for colored LEDs, and provides a mixing chamber for homogeneous light blending. This multi-functionality reduces the need for separate components and simplifies the overall device structure
2Measurement precision
If multiple LEDs of different colors are distributed across the board to achieve homogeneous light mixing, then the spectrum is changed and CRI is improved, but the manufacturing effort and complexity increase
Solution Approach 1:
The light guide element serves as a mediator that simplifies manufacturing by consolidating the light mixing function. Instead of requiring precise distribution of multiple colored LEDs across the board, the invention uses the light guide to collect and redistribute light from fewer colored LEDs positioned at specific locations, significantly reducing assembly complexity and manufacturing effort
Solution Approach 2:
The patent merges the light distribution function and the light mixing function into a single light guide element. This consolidation allows colored LEDs to be positioned at fewer locations while still achieving homogeneous light mixing through the light guide's optical properties, thereby reducing manufacturing complexity
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 approach allows for a simple increase in the color rendering index by distributing colored light evenly across the light-emitting surface, improving color accuracy without the need for extensive arrangement of colored LEDs.
Implementation Method 1
The light-emitting element, through which the white-light LEDs primarily radiate, then serves as a light guide for the light from the other LEDs in order to distribute the light from these other LEDs homogeneously
Data Source
Figure 1~2
AI summary
In a light emission arrangement (10) having a plurality of substantially punctiform first light sources (11) and a transparent light emission element (15), wherein the first light sources (11) are arranged with respect to the light emission element (15) in such a way that the light from said first light sources is radiated via a light entry surface (16) into the light emission element (15) and is emitted via a light exit surface (17), which is substantially opposite the light entry surface (16), at least one second light source (20) is provided, with the light from said second light source differing from the light from the first light sources (11), wherein the second light source (20) is arranged with respect to the emission element (15) in such a way that the light from said second light source is radiated via a surface which is separated from the light entry surface (16) of the first light sources (11) into the light emission element (15), and wherein the light emission element (15) serves as a light-guiding element for the light from the second light source (20), in such a way that the light from the second light source (20) is emitted in such a way as to be distributed substantially over the entire light exit surface (17).