Light Emitting Element Electrode Structure for Uniform Pixel Current
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Solution Overview
Problem
Existing display devices face challenges in improving light emission efficiency of pixels.
Innovation Solution
The display device incorporates a light emitting element with a unique electrode configuration, including protrusions on bonding electrodes to minimize overlap with the light emitting stack, and a reflective and insulating layer to enhance current distribution uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bonding electrodes are positioned close to the light emitting stack for electrical connection, then electrical connectivity is improved, but overlap with the light emitting stack increases causing non-uniform current distribution
Solution Approach 1:
The bonding electrodes are extended in the plane direction (first and second directions) rather than being positioned closer in the vertical direction. This dimensional change allows the electrodes to achieve better electrical connectivity through extended lateral coverage while maintaining sufficient vertical spacing from the light emitting stack to preserve current distribution uniformity.
Solution Approach 2:
The bonding electrode structure is divided into multiple segments including first and second bonding electrodes, first and second protrusions, and multiple exposure surfaces. This segmentation allows each portion to be optimized independently - the protrusions extend for electrical connection while the spaced-apart configuration prevents excessive overlap with the light emitting stack.
2Reliability
If bonding electrodes are extended to improve electrical connection, then electrical connectivity is improved, but device complexity increases
Solution Approach 1:
The bonding electrodes serve multiple functions simultaneously: they provide electrical connection to the light emitting stack, act as bonding interfaces for mounting, and their protrusions serve as both connection extensions and structural features for alignment. This multi-functionality reduces the need for separate components, thereby managing complexity while improving connectivity.
3Reliability
If protrusions are added to bonding electrodes for better connection, then electrical connectivity is improved, but manufacturing complexity increases
Solution Approach 1:
The protrusions are formed as integral parts of the bonding electrodes during the electrode fabrication process itself, rather than being added as separate post-processing steps. This preliminary formation of the protrusion structure simplifies manufacturing by combining multiple functions into a single fabrication step.
Data Source
AI summary
A light emitting element includes a light emitting stack including a first semiconductor layer, a second semiconductor layer disposed on the first semiconductor layer, and an active layer disposed between the first semiconductor layer and the second semiconductor layer, a first bonding electrode electrically connected to a lower surface of the first semiconductor layer and including a first protrusion protruding in at least one of a first direction and a direction opposite to the first direction so as to not overlap the light emitting stack in a plan view, a (2-1)-th bonding electrode electrically connected to the second semiconductor layer, and a (2-2)-th bonding electrode electrically connected to the second semiconductor layer and spaced apart from the (2-1)-th bonding electrode in a second direction intersecting the first direction, and the first bonding electrode may be disposed between the (2-1)-th bonding electrode and the (2-2)-th bonding electrode.