Light-Emitting Element Trenches for Optical Crosstalk Isolation
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Solution Overview
Problem
In color-conversion light emitting devices, reducing LED size and gap between LEDs to increase pixel definition leads to optical crosstalk, which lowers color reproducibility.
Innovation Solution
A light emitting device with light emitting elements that include a semiconductor layer with a first conductive layer, a light emitting layer, and a second conductive layer, where the first conductive layer has trenches between current paths and a light blocking section is provided in these trenches to reduce light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If LED size and gap between LEDs are reduced to increase pixel definition, then pixel definition is improved, but optical crosstalk increases causing color reproducibility to deteriorate
Solution Approach 1:
The first conductive layer is divided into multiple isolated regions by trenches, creating separate current paths for adjacent light emitting elements. This segmentation prevents light emitted from one element from reaching adjacent elements through the conductive layer, thereby suppressing optical crosstalk while maintaining high pixel definition with reduced LED sizes and gaps.
Solution Approach 2:
Trenches are selectively formed only in the first conductive layer in regions between current paths, while the second conductive layer remains continuous. This localized structural modification provides optical isolation where needed without compromising the overall electrical connectivity and light emission functionality of the device.
2Object-affected harmful factors
If trenches are formed in the first conductive layer to suppress optical crosstalk, then optical crosstalk is reduced, but device complexity increases
Solution Approach 1:
The device structure is segmented by introducing trenches that divide the first conductive layer into isolated regions. This segmentation achieves optical isolation to suppress crosstalk while maintaining a relatively simple overall structure, as the trenches are straightforward modifications to the existing layer configuration without requiring complex additional components.
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 light blocking section effectively reduces light leakage between adjacent light emitting elements, thereby suppressing optical crosstalk and maintaining high color reproducibility.
Implementation Method 1
the light blocking section is provided in the one or multiple trenches... This makes it possible to reduce, by the light blocking section, leakage of the light emitted from the light emitting layer into the first conductive layer of the adjacent light emitting element
Data Source
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Figure 5A~5B
AI summary
A light emitting device according to an embodiment of the present disclosure includes multiple light emitting elements. The light emitting elements each include a semiconductor layer including a first conductive layer, a light emitting layer, and a second conductive layer that are stacked in this order. The first conductive layer has a light emitting surface. The light emitting elements further includes a first electrode in contact with the second conductive layer, and a second electrode in contact with the first conductive layer. The light emitting elements share the first conductive layer and the second electrode with each other. The light emitting elements each include a current path in the first conductive layer from a portion opposed to the first electrode to a portion opposed to the second electrode. The first conductive layer has one or multiple trenches in a region between two current paths adjacent to each other. The light emitting device further includes a light blocking section provided in the one or multiple trenches.