Side-Contact Reflective Electrode Layout for Larger Display Emission Area
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Solution Overview
Problem
Existing display devices face challenges in improving display quality due to inefficiencies in pixel design, which affect the emission area and electrical connections within the light emitting elements.
Innovation Solution
The display device incorporates a reflective electrode layer that contacts the cathode electrode through the side surface of a second semiconductor layer not covered by an insulating layer, providing an additional electrical connection path and enhancing the recombination area for electron and hole emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional light emitting element structure is used, then the device structure is simple, but the emission area is limited and display quality is insufficient
Solution Approach 1:
The patent extends the electrical connection path from a single-plane vertical connection to a multi-dimensional path that includes side surface connections. The reflective electrode layer is positioned on the side surface of the second semiconductor layer, creating an additional dimensional pathway for electrical connection that increases the effective emission area without proportionally increasing structural complexity.
Solution Approach 2:
The electrical connection is segmented into multiple paths: one through the upper surface via the bonding electrode, and another through the side surface via the reflective electrode layer. This segmentation of the electrical connection path allows current to flow through multiple routes, effectively increasing the emission area while distributing the structural complexity across separate functional elements.
2Reliability
If the electrical connection path is extended to improve emission area, then display quality improves, but the device structure becomes more complex
Solution Approach 1:
The reflective electrode layer serves multiple functions: it provides an additional electrical connection path from the second semiconductor layer to the cathode electrode, and it maintains a relatively simple layered structure that integrates with the existing device architecture. This multi-functionality improves electrical connection reliability without proportionally increasing structural complexity.
3Area of moving object
If the reflective electrode layer is added to increase emission area, then display quality improves, but manufacturing complexity increases
Solution Approach 1:
The reflective electrode layer is formed on the side surface of the second semiconductor layer before the final device assembly. This preliminary positioning allows the electrode to be integrated into the structure in advance, simplifying subsequent assembly steps and reducing overall manufacturing complexity despite the additional layer.
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 improves display quality by securing a larger emission area and optimizing electrical connections, leading to enhanced performance of the display device.
Implementation Method 1
a reflective electrode layer covering a side surface of the second semiconductor layer which is not covered by the insulating layer, and the reflective electrode layer electrically contacts the cathode electrode
Data Source
AI summary
A display device includes an anode electrode, a light emitting element disposed on the anode electrode, and a cathode electrode covering at least an upper surface of the light emitting element. The light emitting element includes a bonding electrode electrically connected to the anode electrode, a light emitting stack disposed on the bonding electrode and 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, an insulating layer covering at least a side surface of the active layer, and a reflective electrode layer covering a side surface of the second semiconductor layer which is not covered by the insulating layer, and the reflective electrode layer electrically contacts the cathode electrode.