Light-Emitting Component Cover for Stray Light Suppression
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Solution Overview
Problem
Existing light-emitting components suffer from undesired sharp lines or washed-out areas in the far field due to reflections of light at other parts of the component, which are mapped into the optical element's central region, degrading the luminance distribution.
Innovation Solution
The light-emitting component incorporates a cover designed to guide or reflect light away from the central region of the optical element, using features such as increasing thickness, reflective surfaces, and optical bodies or layers to prevent impingement of reflected and non-reflected light within the acceptance angle of the optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional light-emitting component design is used, then the structure is simple, but undesired reflections occur at other parts of the component that are mapped into the optical element's central region, degrading luminance distribution
Solution Approach 1:
A cover element is introduced as an intermediary component between the light source and optical element. This cover includes a light-absorbing layer that intercepts and absorbs stray light and reflections before they can reach the optical element's central region, thereby preventing the degradation of luminance distribution while maintaining structural simplicity
Solution Approach 2:
The invention converts the harmful effect of stray light and reflections into a beneficial outcome by using a light-absorbing layer that specifically targets and absorbs these unwanted light paths. The light-absorbing material transforms the harmful reflected light into heat, preventing it from being mapped into the central region and thus improving luminance distribution quality
2Manufacturing precision
If the cover is designed to guide or reflect light away from the central region, then luminance contrast is enhanced, but device complexity increases
Solution Approach 1:
The cover element serves multiple functions simultaneously: it provides mechanical protection for the light source, acts as a structural support, and incorporates a light-absorbing layer to manage stray light. This multi-functionality allows the single component to enhance luminance contrast quality without proportionally increasing device complexity
Solution Approach 2:
The light-absorbing layer is integrated directly into the cover structure, merging the light management function with the existing protective cover. This integration eliminates the need for separate light-absorbing components, thereby enhancing luminance contrast while minimizing the increase in device 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 design enhances the luminance contrast and quality of projected light by preventing unwanted reflections, resulting in a higher quality luminance distribution in the far field.
Implementation Method 1
the optical element comprises, in the edge region which laterally surrounds the central region, on the side of the optical element facing the connection board, a light-absorbing layer which is arranged to absorb light
Implementation Method 2
the optical element comprises, in the edge region which laterally surrounds the central region, on the side of the optical element facing the connection board, a light-reflecting layer which is arranged to reflect light
Data Source
AI summary
A light-emitting component includes a connection board with a mounting side. The light-emitting component also includes a light source. The light source is fastened and electrically connected to the connection board on the mounting side. The light-emitting component further includes a cover which covers the connection board in places on its mounting side and laterally surrounds the light source. The light-emitting component additionally includes an optical element. The optical element has a central region which is arranged downstream of the light source on the mounting side of the connection board. A provision is made to prevent impingement of light in the central region of the optical element.