Electroluminescent Display Conductive Pattern Opening
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Solution Overview
Problem
Electrical shorts between signal lines in top-emission type electroluminescent display devices can cause ignition and driving failures, compromising safety and image quality.
Innovation Solution
The electroluminescent display device incorporates a substrate with defined display and non-display areas, featuring a thin film transistor, light-emitting diode, and conductive patterns in the non-display area to prevent electrical shorts by using a conductive pattern connected to the second electrode with an opening corresponding to the first link line, ensuring proper voltage application and minimizing moisture permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a seal pattern is used to attach the substrate and cover substrate in top-emission type electroluminescent display devices, then the device can be assembled and light can be emitted from the top surface, but particles are generated during the attaching process that cause electrical shorts between signal lines
Solution Approach 1:
An insulating pattern is introduced as an intermediary layer between the conductive pattern and the signal lines. This insulating pattern prevents direct contact between particles generated during seal pattern attachment and the signal lines, thereby preventing electrical shorts while maintaining the assembly process. The insulating pattern acts as a mediator that blocks the harmful effect of particles without interfering with the normal assembly operation.
2Area of stationary object
If signal lines are placed close together to reduce device size, then the device becomes more compact, but the risk of electrical short between signal lines increases due to particle generation
Solution Approach 1:
The insulating pattern serves as a protective intermediary that enables signal lines to be placed closer together without increasing electrical short risk. By positioning the insulating pattern between the conductive pattern and signal lines, the design allows compact signal line spacing while the insulating pattern blocks particles from causing shorts, thus resolving the contradiction between compactness and reliability.
3Reliability
If the conductive pattern is made continuous to improve electrical connection, then voltage application is improved, but the risk of electrical short with signal lines increases
Solution Approach 1:
The insulating pattern is positioned between the continuous conductive pattern and the signal lines to prevent electrical shorts. This allows the conductive pattern to remain continuous for reliable voltage application to the second electrode, while the insulating pattern acts as a barrier that prevents particles from bridging the gap between the conductive pattern and signal lines, thus maintaining both electrical reliability and safety.
Data Source
AI summary
An electroluminescent display device includes a substrate on which a display area and a non-display area are defined. A thin film transistor is in the display area on the substrate. A light-emitting diode is connected to the thin film transistor and includes a first electrode, a light-emitting layer and a second electrode. A first link line is disposed in the non-display area and applies a first voltage to the first electrode. A second link line is spaced apart from the first link line in the non-display area. A conductive pattern is disposed in the non-display area and is connected to the second electrode to apply a second voltage. The conductive pattern has an opening corresponding to the first link line.