Electrostatic Protection Diode Single Contact Hole Design
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Solution Overview
Problem
Static electricity generated during the manufacturing of OLED devices can penetrate through wirings and damage pixel structures, leading to deterioration of the devices, as existing electrostatic protection diodes require multiple contact holes increasing the device's width and reducing the number of protection diodes that can be fitted due to space constraints.
Innovation Solution
The implementation of an electrostatic protection diode with a reduced width, achieved by using a single contact hole design, which allows for a more compact structure that can be integrated into OLED devices, thereby reducing the peripheral region and increasing the number of protection diodes that can be included, effectively preventing static electricity from penetrating into the pixel region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple contact holes are used in existing electrostatic protection diodes, then the electrical connection is improved, but the device width increases and the number of protection diodes that can be fitted decreases
Solution Approach 1:
The patent combines multiple contact holes into a single contact hole structure. The single contact hole is positioned to simultaneously contact the anode and cathode regions of the electrostatic protection diode, merging what were previously separate contact points into one unified contact structure. This reduces the overall device width while maintaining the necessary electrical connections through strategic positioning and conductive material distribution within the single contact hole.
2Reliability
If multiple contact holes are used in existing electrostatic protection diodes, then the electrical connection is improved, but the peripheral region increases and the number of protection diodes that can be included decreases
Solution Approach 1:
The patent merges multiple contact holes into a single contact hole that serves both anode and cathode connection functions. This consolidation reduces the peripheral space required for each electrostatic protection diode, enabling a higher density of protection diodes to be integrated into the same area. The single contact hole design maintains reliable electrical connections while maximizing the number of protection diodes that can be included in the display device.
3Area of stationary object
If a single contact hole design is used, then the device width is reduced and more protection diodes can be fitted, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by concentrating the contact functionality into a single strategically positioned contact hole with specific local characteristics. The contact hole is designed with particular dimensions, positioning, and conductive material distribution to locally achieve the dual function of contacting both anode and cathode regions. This localized approach simplifies the overall manufacturing process compared to managing multiple separate contact holes, as it focuses the manufacturing precision requirements on a single critical feature.
Data Source
AI summary
An organic light emitting display device includes a substrate including a pixel region and a peripheral region, a first wiring, a second wiring, a third wiring, and an electrostatic protection structure including electrostatic protection diodes coupled to the first, second, and third wirings. The electrostatic protection diodes each include an active pattern, a gate electrode pattern, and a connection pattern. The active pattern is at the peripheral region of the substrate, and has a first region, a second region spaced apart from the first region, and a third region between the first and second regions. The gate electrode pattern is at the third region on the active pattern. The connection pattern is coupled to the gate electrode pattern and the active pattern and is on the gate electrode pattern, and overlaps a portion of the first region of the active pattern and a portion of the third region.