LED Mixing Chamber Side Wall Placement for Uniform Illumination
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Solution Overview
Problem
Existing light emitting modules based on LEDs face challenges in providing uniform illumination due to the point source nature of LEDs, leading to light absorption and inefficiencies in solid wave guides, and placing multiple LEDs at the bottom of a mixing chamber results in reduced reflectivity, increased costs, and potential overheating.
Innovation Solution
A light emitting module with a mixing chamber having a highly reflective base and side walls and a semi-reflective light exit window, where LEDs are positioned on the side walls to enhance light mixing, with an aspect ratio of 1 to 8 and reflectivity of 30-80% for the exit window, optimizing light coupling and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs are placed at the bottom of a mixing chamber, then uniform illumination can be achieved, but reflectivity decreases and system efficiency is reduced
Solution Approach 1:
The patent transitions from placing LEDs in a two-dimensional bottom surface configuration to a three-dimensional side wall configuration. This dimensional change allows LEDs to be distributed along the vertical height of the mixing chamber, improving light distribution uniformity while maintaining distance from the exit window to preserve reflectivity and system efficiency.
Solution Approach 2:
The patent segments the LED arrangement from a concentrated bottom placement to distributed side wall placement. By dividing the lighting function across multiple LEDs positioned at different heights on the side wall, the system achieves better uniformity without concentrating energy in one location, thus maintaining overall efficiency.
2Illumination intensity
If a large number of LEDs are placed at the bottom of a mixing chamber, then uniform illumination can be achieved, but costs increase and overheating occurs
Solution Approach 1:
The patent segments the LED array across the side wall surface rather than concentrating them at the bottom. This spatial segmentation distributes heat generation across a larger area, preventing localized overheating while achieving uniform illumination with fewer total LEDs.
Solution Approach 2:
By moving LEDs from a two-dimensional bottom plane to a three-dimensional side wall distribution, the patent increases the thermal dispersion area. This dimensional transition allows heat to dissipate more effectively across the side wall structure, reducing overheating risks.
3Device complexity
If LEDs are arranged as point sources, then the structure is simple, but uniform illumination cannot be achieved
Solution Approach 1:
The patent maintains the simple point source LED structure but redistributes them in three-dimensional space along the side wall. This dimensional redistribution transforms the lighting pattern from non-uniform to uniform while preserving the simplicity of individual point source LEDs and the overall structural design.
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 achieves efficient and cost-effective uniform illumination by improving light mixing and reducing the number of LEDs required, while minimizing absorption and overheating, thereby enhancing the module's efficiency and reducing glare.
Implementation Method 1
a mixing chamber comprising a base having a highly reflective inner surface, a circumferential side wall having a highly reflective inner surface
Implementation Method 2
a semi-reflective light exit window... the reflectivity of the semi-reflective light exit window is in the range from 30% to 80% for light emitted from the light emitting diode
Implementation Method 3
light emitted from the at least one light emitting diode is emitted into the mixing chamber for mixing of the emitted light within the mixing chamber
Data Source
AI summary
The present invention relates to light emitting module, comprising: a mixing chamber (10) arranged to mix light, the mixing chamber (10) comprising a base (12) having a highly reflective inner surface, a circumferential side wall (14) having a highly reflective inner surface, and a semi-reflective light exit window (16); and at least one light emitting diode (5) arranged on the inner surface of the circumferential side wall (14) such that light emitted from the at least one light emitting diode (5) is emitted into the mixing chamber (10) for mixing of the emitted light within the mixing chamber (10), wherein the semi-reflective light exit window (16) is arranged to couple out light emitted from the at least one light emitting diode (5) and mixed within the mixing chamber (10), wherein the aspect ratio of a width (W) and a height (H) of the mixing chamber (10) is in the range of 1 to 8, wherein the reflectivity of the semi-reflective light exit window (16) is in the range from 30% to 80% for light emitted from the light emitting diode (5).