Light Emitting Module with Scattering Layer for Uniform Luminance
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Solution Overview
Problem
Existing light emitting modules with light guiding plates and multiple light emitting elements suffer from luminance non-uniformity and increased thickness due to the arrangement of light emitting elements at predetermined intervals.
Innovation Solution
A light emitting module design that includes a light guiding plate with a light-cutting scattering layer and optical function parts, where the light emitting elements are disposed on the second main surface of the light guiding plate, and the optical function parts and light-cutting scattering layers are positioned on the first main surface to correspond with the light emitting elements, effectively reducing luminance non-uniformity and module thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting elements are disposed at predetermined intervals on the light guiding plate, then the module can be manufactured with standard processes, but luminance non-uniformity occurs and thickness increases
Solution Approach 1:
The patent introduces optical function parts (lens arrays, diffusing plates) and light-cutting scattering layers as intermediary components between the light emitting elements and the light guiding plate. These intermediaries modify the light distribution pattern, cutting high-intensity light paths and scattering light to achieve uniform luminance while maintaining the standardized interval arrangement of LED elements for ease of manufacture.
2Device complexity
If light emitting elements are disposed at predetermined intervals on the light guiding plate, then the module structure is simplified, but module thickness increases
Solution Approach 1:
The patent addresses the thickness issue by optimizing the vertical stacking arrangement of optical components. The optical function parts and light-cutting scattering layers are positioned at specific heights above the light guiding plate, creating a layered structure that achieves light uniformity without requiring increased horizontal spacing between LED elements, thus maintaining a compact overall thickness.
3Illumination intensity
If optical function parts are added to reduce luminance non-uniformity, then luminance uniformity improves, but device complexity increases
Solution Approach 1:
The patent combines multiple optical functions into integrated components. The optical function parts serve dual purposes: they focus/collimate light from individual LED elements while simultaneously working with the light-cutting scattering layers to distribute light uniformly. This merging of functions reduces the number of separate components needed and simplifies the overall optical system 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 proposed design achieves reduced luminance non-uniformity and a thinner module structure by diffusing light emitted by the light emitting elements through the optical function parts and cutting high-intensity light with the light-cutting scattering layers, thereby improving the overall performance and manufacturing efficiency of the light emitting module.
Implementation Method 1
a light-cutting scattering layer disposed on a first main surface side of the light guiding plate so as to correspond to the optical axis of the light emitting element. The light-cutting scattering layer covers the optical function part as seen in a plan view
Implementation Method 2
an optical function part greater in size than a light emitting surface of the light emitting element, and disposed in the first main surface of the light guiding plate so as to correspond to an optical axis of the light emitting element
Data Source
AI summary
A light emitting module includes a light guiding plate being light-transmissive and having a first main surface being as a light exiting surface and a second main surface positioned opposite to the first main surface; a light emitting element disposed at the second main surface and configured to emit light toward the light guiding plate; an optical function part being greater in size than a light emitting surface of the light emitting element, the optical function part being disposed in the first main surface so as to correspond to an optical axis of the light emitting element; and a light-cutting scattering layer disposed on a first main surface side of the light guiding plate so as to correspond to the optical axis of the light emitting element. The light-cutting scattering layer covers the optical function part as seen in a plan view.