ESD Circuit with Protruding Electrodes for OLED Protection
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Solution Overview
Problem
Conventional organic light emitting displays are prone to damage due to electrostatic discharge (ESD) during manufacturing and handling processes, which can occur from internal or external environmental factors, leading to circuit damage.
Innovation Solution
An electrostatic discharge circuit is integrated into the non-pixel area of the display, featuring a semiconductor layer, gate insulating layer, gate electrode, insulating interlayer, source/drain electrode, and protruding electrodes designed to concentrate static electricity and facilitate its dissipation, thereby protecting the pixels and drivers from ESD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing processes are used for organic light emitting displays, then production efficiency is maintained, but electrostatic discharge damages internal circuits
Solution Approach 1:
An electrostatic discharge circuit is introduced as an intermediary protective element between external static electricity sources and the internal pixel circuits. This mediator captures and dissipates electrostatic discharge energy through dedicated discharge paths, preventing direct damage to sensitive display components while maintaining overall system functionality.
Solution Approach 2:
The electrostatic discharge circuit is designed to activate automatically when static electricity is detected, performing preliminary protective action before damage can occur to the pixel circuits. The circuit includes pre-configured discharge paths and protective components that are ready to intercept and neutralize ESD events during manufacturing and operation.
2Reliability
If electrostatic discharge protection is added to protect pixels and drivers, then reliability improves, but device complexity increases
Solution Approach 1:
The electrostatic discharge protection system is segmented into distinct functional zones: a first electrostatic discharge circuit positioned to protect the pixel area, and a second electrostatic discharge circuit positioned to protect the driver area. This segmentation allows each protective circuit to be optimized for its specific protection target while maintaining modular design benefits.
Solution Approach 2:
Different electrostatic discharge protection mechanisms are applied to different regions of the display device based on their specific vulnerability. The pixel area receives protection through a first circuit configuration, while the driver area receives protection through a second circuit configuration, with each area having tailored protection characteristics appropriate to its functional requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The electrostatic discharge circuit effectively prevents damage to the organic light emitting display components by dissipating static electricity, ensuring stable operation and extending the lifespan of the display.
Implementation Method 1
an electrostatic discharge circuit in the non-pixel area, the electrostatic discharge circuit including a semiconductor layer formed on the substrate, a gate insulating layer formed on the semiconductor layer, a gate electrode formed on the gate insulating layer, an insulating interlayer formed to cover the gate electrode, and a source/drain electrode formed on the insulating interlayer
Data Source
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AI summary
An organic light emitting display in which an electrostatic discharge circuit is formed on a non-pixel area of a substrate is disclosed. The electrostatic discharge circuit comprises a first electrode layer, a first insulating layer formed on the first electrode layer and a second electrode layer formed on the first insulating layer. The first electrode layer and the second electrode layer each comprise a protruding electrode formed to extend horizontally toward the other of the first and second electrode layers. According to the organic light emitting display, it is possible to prevent a pixel and a driver included in the organic light emitting display from being damaged by electrostatic discharge by dissipating the electrostatic discharge current through the protruding electrode.