Light Emitting Element Groove Structure for Higher Luminance Contrast
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Solution Overview
Problem
Existing light emitting devices struggle to achieve a significant luminance difference between turned-on and turned-off light emitting elements due to light interference between adjacent elements.
Innovation Solution
A light emitting device design featuring a covering member with a groove between adjacent light transmissive members, a light shielding member covering the groove, and an air layer on the shielding member, which reduces light propagation and interference by using a light shielding member with high reflectance and a refractive index greater than the air layer, enhancing the luminance difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light emitting elements are arranged closely to increase device density, then productivity and area utilization are improved, but light interference between adjacent elements increases causing reduced luminance contrast
Solution Approach 1:
The patent divides the space between adjacent light emitting elements by introducing grooves that physically segment the light propagation paths. This segmentation prevents light from one element from interfering with adjacent elements, thereby maintaining high luminance contrast even when elements are densely packed.
Solution Approach 2:
The patent applies different properties to different regions: the grooves between elements have light-shielding properties (low light transmittance) while the regions above the light emitting elements maintain high light transmittance. This local differentiation allows dense packing without compromising luminance contrast.
2Reliability
If a covering member is added to cover lateral surfaces for structural integrity, then device reliability is improved, but light interference between adjacent elements increases
Solution Approach 1:
The covering member incorporates grooves that segment it into regions with different optical properties. The grooved regions between elements provide light shielding while the covering regions above elements maintain light transmittance, thus preserving both structural integrity and luminance contrast.
Solution Approach 2:
The covering member exhibits local quality differentiation where grooved portions have low light transmittance for shielding while non-grooved portions have high light transmittance for light extraction, resolving the contradiction between structural coverage and light interference prevention.
3Illumination intensity
If light shielding members are added to reduce light interference, then luminance contrast is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the light shielding function with the existing covering member by forming grooves within it. This integration eliminates the need for separate light shielding components, reducing device complexity while maintaining effective light interference prevention and high luminance contrast.
Solution Approach 2:
The covering member serves multiple functions: it provides structural integrity, protects lateral surfaces, and through its grooved structure, acts as a light shielding member. This multi-functionality reduces the number of separate components needed, simplifying the overall device structure.
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 design effectively increases the luminance difference between turned-on and turned-off light emitting elements by minimizing light interference, improving contrast and reducing heat-related issues, particularly effective in narrow-pitch devices.
Implementation Method 1
a light shielding member covering a surface of the covering member that defines the first groove
Implementation Method 2
an air layer disposed on the light shielding member in the first groove
Data Source
AI summary
A light emitting device includes: a plurality of light emitting elements; a plurality of light transmissive members disposed on the respective light emitting elements; a covering member covering lateral surfaces of the light transmissive members and lateral surfaces of the light emitting elements, wherein upper surfaces of the light transmissive members are exposed from the covering member, and wherein the covering member defines a first groove that opens at an upper surface of the covering member and is located between adjacent ones of the light transmissive members; a light shielding member covering a surface of the covering member that defines the first groove; and an air layer disposed on the light shielding member in the first groove.