OLED Display ESD Protection Circuit Fabrication
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) displays are susceptible to damage from electrostatic discharge (ESD) during fabrication and operation, which can compromise the integrity of the pixel and driver circuits.
Innovation Solution
An electrostatic discharge circuit is integrated into the non-pixel region of the OLED display, comprising a buffer layer, semiconductor layer, gate insulating layer, gate electrode, interlayer dielectric layer, source/drain electrodes, and a planarization layer, designed to dissipate static electricity through specific discharge paths, protecting the internal circuits from ESD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OLED display fabrication processes are used, then the display can be manufactured with standard procedures, but the internal circuits are vulnerable to electrostatic discharge damage during fabrication and operation
Solution Approach 1:
An electrostatic discharge circuit is introduced as an intermediary protective structure between the external environment and the internal pixel circuits. This circuit includes a semiconductor layer, gate insulating layer, gate electrode, and source/drain electrodes configured to provide a controlled discharge path that intercepts and safely dissipates electrostatic charges before they can damage the sensitive pixel components
Solution Approach 2:
The electrostatic discharge circuit is segmented into distinct functional layers (buffer layer, semiconductor layer, gate insulating layer, gate electrode, interlayer dielectric layer, source/drain electrodes, planarization layer), each performing a specific protective function. This segmentation allows the complex protection mechanism to be integrated systematically into the existing OLED fabrication process without requiring complete process redesign
2Reliability
If an electrostatic discharge circuit is added to protect against ESD, then circuit reliability improves, but the fabrication process complexity increases
Solution Approach 1:
The electrostatic discharge circuit fabrication is merged with the existing thin film transistor fabrication process. The same deposition, etching, and patterning equipment and methods used for creating TFTs are utilized to form the ESD protection circuit layers, allowing both structures to be manufactured in an integrated sequence without requiring separate dedicated fabrication lines or exotic processing techniques
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 shields the OLED display's internal components from both high and low-level static electricity, preventing damage and ensuring reliable operation, while also simplifying the fabrication process by using similar methods to those for forming thin film transistors.
Implementation Method 1
An electrostatic discharge circuit which prevents a pixel and a driver included in an organic light emitting diode display from being damaged by an electrostatic discharge
Data Source
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AI summary
An organic light emitting diode display and a fabricating method thereof are disclosed. Embodiments provide an organic light emitting diode display and a fabricating method thereof which prevents a pixel and a driver in cluded in the organic light emitting diode display from being damaged due to an electrostatic discharge by forming a protective layer along at least one edge region of a substrate having a pixel region and a non -pixel region.