Light-Emitting Element Contact Layout for Display Brightness
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Solution Overview
Problem
Current display devices, particularly inorganic light-emitting diode (OLED) displays, face challenges in achieving improved luminous efficiency due to limitations in electrode structures and contact configurations, which affect light emission and overall display performance.
Innovation Solution
The proposed display device incorporates a novel electrode structure with specific configurations, including a substrate with spaced-apart electrodes, contact electrodes, and insulating layers, where the contact portions are designed to minimize interference with light emission paths, allowing for improved electrical connection and enhanced luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact electrodes are positioned to ensure electrical connection, then electrical conductivity is improved, but light emission is blocked and luminous efficiency deteriorates
Solution Approach 1:
The contact portions are positioned at end portions of the contact electrodes in the first direction, utilizing the spatial dimension along the electrode length to achieve electrical connection without blocking the light emission path. This dimensional arrangement allows both electrical functionality and optical transparency to coexist.
Solution Approach 2:
Different regions of the contact electrodes are assigned different functions: the end portions (in the first direction) serve as contact portions for electrical connection, while the intermediate portions maintain transparency for light emission. This local differentiation resolves the contradiction between electrical connection and light transmission.
2Reliability
If contact portions are disposed on electrodes, then electrical connection is improved, but light emission paths are interfered with and luminous efficiency deteriorates
Solution Approach 1:
The contact portions are strategically positioned at the end portions of the contact electrodes in the first direction, utilizing the longitudinal dimension of the electrodes to achieve electrical connection without interfering with the light emission path that travels through the intermediate portions.
Solution Approach 2:
The contact electrodes exhibit local quality differentiation where end portions provide electrical connection functionality while intermediate portions maintain optical transparency, allowing simultaneous achievement of reliable electrical connection and high light emission intensity.
3Ease of manufacture
If electrode structure is simplified for ease of manufacture, then manufacturing complexity is reduced, but luminous efficiency and display performance deteriorate
Solution Approach 1:
The contact electrodes serve multiple functions: they provide electrical connection through contact portions at their end portions while simultaneously maintaining transparency for light emission through their intermediate portions. This multi-functionality achieves both manufacturing simplicity and high luminous efficiency without requiring separate structures for electrical and optical functions.
Data Source
AI summary
A display device includes a substrate, a first electrode and a second electrode which are spaced apart from each other in a second direction, light-emitting elements spaced apart from each other in the first direction, a first contact electrode electrically contacting the light-emitting elements, and a second contact electrode electrically contacting the light-emitting elements. The first contact electrode electrically contacts the first electrode through a first contact portion disposed on the first electrode, the second contact electrode electrically contacts the second electrode through a second contact portion disposed on the second electrode, the first contact portion is disposed on an end portion in the first direction of the first contact electrode, and the second contact portion is disposed on an end portion in the first direction of the second contact electrode.