OLED Data Line Switching Layout for Trim-Induced Short Prevention
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Solution Overview
Problem
During the trimming process of OLED devices, foreign materials can cause electrical short circuits between data lines, leading to image display defects such as line dim phenomena due to abnormal data signal application.
Innovation Solution
A display device structure that includes a substrate with a display area and a non-display area, featuring data lines connected to pixels, first input pads, switching transistors, and second input pads connected to gate electrodes through switching lines, which are designed to be in an electrical disconnection state during the trimming process to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a trimming process is performed to remove outer portions of trimming lines, then manufacturing precision is improved, but foreign materials are generated causing electrical short circuits
Solution Approach 1:
A switching transistor is introduced as an intermediary protective element between the data line and the extending line. The switching transistor includes a gate electrode, source electrode, and drain electrode positioned between the first input pad (connected to data line) and the second input pad (connected to extending line). By controlling the switching transistor to be in an off state during trimming, electrical discharge paths are blocked, preventing foreign materials from causing short circuits while still allowing the trimming process to proceed with high precision.
2Reliability
If extending lines are separated through trimming, then device reliability is improved, but foreign materials cause electrical short circuits between data lines
Solution Approach 1:
The switching transistor is configured in advance to be in an off state during the trimming process, creating a protective barrier before the trimming operation begins. This preliminary protective action prevents foreign materials generated during trimming from creating electrical discharge paths between the data line and extending line, thereby maintaining electrical connection reliability despite the presence of harmful foreign materials.
3Reliability
If switching transistors are added to prevent short circuits, then device reliability is improved, but device complexity increases
Solution Approach 1:
The protection function is segmented into a dedicated switching transistor component with clearly defined terminals: a first terminal connected to the data line through the first input pad, a second terminal connected to the extending line through the second input pad, and a gate electrode for control. This segmentation allows the switching transistor to be integrated into the existing circuit layout without significantly increasing overall complexity, as it uses standard transistor structures and connection methods already familiar in display device manufacturing.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area, the display area including pixels; data lines extending into the display area and connected to pixels; a first input pad in the non-display area and connected to the data lines; a switching transistor located in the non-display area between the first input pad and one side of the substrate and connected to the first input pad; and a second input pad in the non-display area and connected to a gate electrode of the switching transistor through a switching line.