Display Electrode Layout With Edge Contacts for Higher Light Output
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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 multiple electrodes and contact electrodes, where the contact portions are strategically positioned to minimize interference with light emission paths, and the use of insulating layers to optimize light transmission and reduce losses.
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
Solution Approach 1:
The contact portions are positioned at end portions of the contact electrodes in the first direction, utilizing the dimensional space at the edges rather than the central light-emitting region. This spatial arrangement in another dimension (edge positioning) allows electrical connection without blocking the light emission path from the light-emitting elements between the electrodes.
2Illumination intensity
If contact portions are positioned at end portions of contact electrodes, then light emission is improved, but electrical connection reliability may be compromised
Solution Approach 1:
The contact portions are specifically positioned at the end portions of the contact electrodes in the first direction, creating a localized connection region that is spatially separated from the light-emitting region. This local quality differentiation allows the end portions to serve electrical connection functions while the central regions between electrodes maintain light emission functionality.
3Illumination intensity
If light-emitting elements are spaced apart in the first direction, then light transmission is improved, but device area increases
Solution Approach 1:
The light-emitting elements are spaced apart only in the first direction between the contact electrodes, rather than requiring uniform spacing in all directions. This partial spacing action allows light transmission improvement in the critical emission path while minimizing the overall device area increase, as the spacing is applied selectively rather than excessively throughout the entire device structure.
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.