Short Ring TFT Layout for Static-Protected OLED Lead-Out Wiring
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Solution Overview
Problem
In organic EL display devices, the exposure of lead-out wiring line end faces after cutting short rings can lead to excessive voltage application due to static electricity and moisture-induced deterioration, affecting the display region.
Innovation Solution
A short ring TFT structure is integrated between adjacent lead-out wiring lines, featuring a semiconductor layer with channel, source, and drain regions, along with gate electrodes and insulating films, allowing electrical connections to source and drain regions and a threshold value control wiring line, preventing the need for cutting and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If short rings are cut and removed to electrically connect lead-out wiring lines, then electrical connection between wiring lines is achieved, but lead-out wiring line end faces are exposed causing static electricity damage and moisture deterioration
Solution Approach 1:
A protective film is introduced as an intermediary layer that covers the exposed end faces of lead-out wiring lines after short ring removal. This protective film acts as a barrier against static electricity and moisture while allowing the electrical connection function to be maintained through the short ring structure.
Solution Approach 2:
The protective film is formed beforehand to cover and protect the lead-out wiring line end faces before they are exposed to harmful environmental factors. This preemptive protection prevents static electricity discharge and moisture ingress that would otherwise damage the wiring lines.
2Object-affected harmful factors
If short rings are kept intact without cutting, then lead-out wiring line end faces are protected, but electrical connection between adjacent wiring lines cannot be established
Solution Approach 1:
The short ring structure is segmented into two functional parts: the main body that remains intact to provide protection, and the removed portion that creates the electrical connection path. This segmentation allows both protective and conductive functions to coexist.
Solution Approach 2:
The protective film and the short ring structure are merged into a unified protective-conductive system. The protective film covers the wiring line end faces while the short ring provides the electrical connection, combining both functions in a single integrated structure.
3Ease of operation
If lead-out wiring line end faces are exposed for electrical connection, then wiring line connectivity is improved, but deterioration spreads to the display region
Solution Approach 1:
The protective film serves as an intermediary barrier that prevents deterioration from spreading from the exposed wiring line end faces to the display region. It blocks moisture and contaminants while allowing the electrical connection to function.
Solution Approach 2:
The protective film is applied in advance to prevent deterioration before it can spread to the display region. This preliminary protective action counteracts the potential harmful effects of exposing wiring line end faces for electrical connection.
Data Source
AI summary
A display device includes a short ring TFT, wherein the short ring TFT includes a semiconductor layer, a first gate electrode, a second gate electrode, a first gate insulating film provided between the semiconductor layer and the first gate electrode, and a second gate insulating film provided between the semiconductor layer and the second gate electrode, one of a pair of adjacent lead-out wiring lines is electrically connected to a source region of the semiconductor layer, the other of the pair of adjacent lead-out wiring lines is electrically connected to a drain region of the semiconductor layer, one of the first gate electrode and the second gate electrode is electrically connected to the source region or the drain region, and the other of the first gate electrode and the second gate electrode is electrically connected to a threshold value control wiring line.