Light-emitting module asymmetric reflector reduces peripheral darkening
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Solution Overview
Problem
Light-emitting modules with two-dimensionally arranged light-emitting units experience darkening at the periphery due to uneven light distribution, leading to luminance non-uniformity.
Innovation Solution
The light-emitting module design incorporates light-guiding plates with recesses and reflective members, where the center of the reflective member in each light-emitting unit is positioned closer to the center of the light-emitting region than the optical axis, optimizing light distribution to reduce peripheral darkening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light-emitting units are two-dimensionally arranged in a light-emitting module, then the light source coverage is improved, but peripheral darkening occurs due to uneven light distribution
Solution Approach 1:
The patent applies local quality by making the light-reflective member asymmetric in structure, with different reflectivity or geometry in different regions. Specifically, the light-reflective member has a first reflective surface facing the light source and a second reflective surface facing away, with at least one surface having non-uniform reflective properties that vary by location to compensate for the distance-dependent light intensity distribution
Solution Approach 2:
The patent employs asymmetry by designing the light-reflective member with an asymmetric geometry relative to the light source. The member is positioned closer to the center of the light-emitting region, and its reflective surfaces are configured with different orientations and areas, creating an asymmetric light redistribution pattern that compensates for the radial distance variation from the light source
2Stability of the object's composition
If the center of the reflective member coincides with the optical axis of the light source, then the light distribution is symmetric, but peripheral darkening is exacerbated
Solution Approach 1:
The patent deliberately breaks the symmetry by positioning the light-reflective member's center away from the light source's optical axis. The member is offset toward the center of the light-emitting region, creating an asymmetric configuration that redirects more light toward the periphery where darkening occurs, while maintaining controlled symmetry in the overall module 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
This design enhances light distribution, reducing darkening at the periphery and improving luminance uniformity across the light-emitting region.
Implementation Method 1
a light-reflective first member inside the second recess... to reflect at least a portion of light emitted through the luminous flux control members
Data Source
AI summary
Darkening of the periphery of a light-emitting module in which a plurality of light-emitting units are two-dimensionally arranged is reduced.The present light-emitting module has a light-emitting region including a plurality of light-emitting units two-dimensionally arranged, the light-emitting units each including a light-guiding plate having a first main surface, a first recess opening toward the first main surface, a second main surface opposite to the first main surface, and a second recess opening toward the second main surface; a light source inside the first recess; and a light-reflective first member inside the second recess. In each of the light-emitting units, a center of the light-emitting unit and a center of the second recess coincide with an optical axis of the light source in a plan view. In at least one of the light-emitting units, a center of the first member is closer to a center of the light-emitting region than the optical axis of the light source is in a plan view.