Segmented Light-Emitting Element Layout for Higher Luminance Contrast
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Solution Overview
Problem
Existing light-emitting devices struggle to achieve a significant luminance difference between light-emitting and non-light-emitting portions, which affects the overall light emission pattern and contrast.
Innovation Solution
The light-emitting device incorporates a plurality of light-emitting elements arranged on a wiring substrate, where each element has a first portion with a longer semiconductor layered body and a second portion with a shorter semiconductor layered body, along with reflective layers and insulating layers, to enhance luminance contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform light-emitting elements are used across the device, then manufacturing is simplified, but luminance difference between light-emitting and non-light-emitting portions is insufficient
Solution Approach 1:
Each light-emitting element is segmented into a first portion (light-emitting) and a second portion (non-light-emitting or less light-emitting). The first portion includes a first semiconductor layered body with light-emitting layers, while the second portion includes a second semiconductor layered body with fewer or no light-emitting layers. This segmentation enables different luminance levels within each element, increasing the overall luminance difference without requiring entirely different element designs.
Solution Approach 2:
Different regions of each light-emitting element are given different qualities: the first portion has a structure optimized for light emission (multiple light-emitting layers), while the second portion has a structure optimized for reduced emission (fewer or no light-emitting layers, with reflective layers). This local differentiation of structural quality achieves the desired luminance contrast while maintaining a relatively uniform overall element design.
2Illumination intensity
If the semiconductor layered body length is uniform across all portions, then manufacturing precision is easier to maintain, but luminance contrast between portions is reduced
Solution Approach 1:
The semiconductor layered body is segmented into different length sections: a first length section corresponding to the first portion and a second length section corresponding to the second portion. The first length section has a greater length than the second length section. This segmentation of the layered body length enables different light emission characteristics in different portions while maintaining controlled manufacturing tolerances within each section.
3Object-generated harmful factors
If all portions emit light uniformly, then device simplicity is maintained, but dark lines appear between adjacent elements during partial illumination
Solution Approach 1:
The light-emitting function is extracted from the second portion of each light-emitting element, or reduced significantly. The second portion includes a second semiconductor layered body with fewer or no light-emitting layers compared to the first portion. By removing or reducing the light-emitting capability in specific portions, dark lines between adjacent elements during partial illumination are prevented, as the non-light-emitting portions create clear visual separation between active elements.
Solution Approach 2:
Different portions of the light-emitting elements are given different light emission qualities: the first portion has high light emission capability with multiple light-emitting layers, while the second portion has low or no light emission capability. This local quality differentiation eliminates dark lines between adjacent elements during partial illumination by ensuring that only the intended light-emitting portions are active, while maintaining a relatively simple overall element 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
This configuration effectively increases the luminance difference between light-emitting and non-light-emitting portions, improving the light emission pattern and reducing the likelihood of dark lines between adjacent elements, thus enhancing the device's light-emitting characteristics during partial illumination.
Implementation Method 1
The second portions each include a second semiconductor layered body and a reflective layer connected to the second semiconductor layered body
Data Source
AI summary
A light-emitting device includes a wiring substrate and a plurality of light-emitting elements arrayed on the wiring substrate along a first direction and each having a rectangular shape. The light-emitting elements each include a first portion, and a plurality of second portions disposed on either side of the first portion in the first direction. The first portion includes a first semiconductor layered body and an electrode. The second portions each include a second semiconductor layered body, and a reflective layer connected to the second semiconductor layered body. The first portion includes a first length section and a second length section. In the first length section, a length of the first semiconductor layered body in the first direction is a first length. In the second length section, a length of the first semiconductor layered body in the first direction is a second length shorter than the first length.