Wearable Display Cathode Mesh Layout for Lower Voltage Drop
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Solution Overview
Problem
Existing display devices face challenges in improving the reliability of display panels, particularly in wearable electronic devices, due to issues with conductive patterns and voltage drop in non-display areas.
Innovation Solution
The display device incorporates a conductive pattern and dam structures in the non-display area, with a cathode electrode electrically connected to these patterns, reducing resistance and improving voltage drop through a mesh structure without additional processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive patterns are arranged in the non-display area, then resistance is reduced and voltage drop is improved, but device complexity increases
Solution Approach 1:
The patent merges the cathode electrode with conductive patterns (first and second conductive patterns) in the non-display area to form an integrated mesh structure. This combination reduces resistance and voltage drop while avoiding separate additional processing steps, thus improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The conductive patterns in the non-display area serve multiple functions: they act as part of the cathode electrode for electrical connection, provide mesh structure support, and reduce voltage drop. This multi-functionality improves display panel reliability without requiring separate dedicated components, thereby limiting the increase in device complexity.
2Reliability
If a mesh structure is formed with additional processing steps, then resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent combines the formation of the cathode electrode and the mesh structure into a single integrated process. The conductive patterns are arranged and connected during the same manufacturing steps as the cathode electrode, eliminating the need for separate additional processing steps while still achieving reduced resistance and improved reliability.
3Manufacturing precision
If conductive patterns are spaced apart from light emitting elements, then manufacturing precision is improved, but electrical connectivity may be compromised
Solution Approach 1:
The insulating layer acts as an intermediary between the conductive patterns and the light emitting elements. It provides physical separation that improves manufacturing precision and pattern alignment, while the conductive patterns remain electrically connected through the mesh structure and cathode electrode, maintaining electrical connectivity reliability.
Data Source
AI summary
A display device includes: a substrate on which a display area and a non-display area are defined; a pixel circuit layer on the substrate; a plurality of light emitting elements on the pixel circuit layer in the display area; a first conductive pattern on the pixel circuit layer in the display area; dam structures on the substrate in the non-display area; a second conductive pattern disposed between two adjacent dam structures of the dam structures in the non-display area; and an insulating layer disposed on the light emitting elements, the first conductive pattern, the dam structures, and the second conductive pattern. The first conductive pattern and the second conductive pattern may be disposed in substantially the same layer and include the same material.