ESD Protection Circuit for Display Devices
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Solution Overview
Problem
Conventional electrostatic discharge (ESD) protection circuits in display devices, such as OLED and LTPS-LCD, are limited in effectively neutralizing transient high currents and are not adaptable for multi-layered structures, leading to potential damage from electrostatic discharge during manufacturing and usage.
Innovation Solution
An ESD protection circuit with a base substrate and multiple ESD units, each comprising active and metallic layers with conductive terminals, allowing for two-way through property and active discharge capabilities, enabling quick neutralization of static electricity across various voltage specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD protection circuits are used, then the structure is simple, but the ability to neutralize transient high currents is insufficient
Solution Approach 1:
The ESD protection circuit is divided into multiple ESD units, each comprising active layers, metallic layers, and insulating layers. Each unit can independently handle electrostatic discharge, distributing the neutralization capability across segmented structures rather than relying on a single complex circuit.
Solution Approach 2:
The patent implements a multi-layered structure where first metallic layer and second metallic layer are nested with insulating layers between them, and both are positioned over the active layer. This nested arrangement creates multiple discharge paths within a compact vertical structure, enhancing neutralization capability without proportionally increasing horizontal space.
2Adaptability or versatility
If conventional ESD protection circuits are used, then the manufacturing process is straightforward, but the adaptability for multi-layered structures is limited
Solution Approach 1:
The ESD protection circuit design with multiple metallic layers, insulating layers, and active layers can be integrated into various multi-layered display device structures (OLED, LTPS-LCD, etc.). The same basic ESD unit structure serves multiple functions: protecting different layers, handling various voltage specifications, and adapting to different device architectures.
Solution Approach 2:
The patent transitions from planar ESD protection to a three-dimensional multi-layered structure by stacking metallic layers, insulating layers, and active layers vertically. This vertical dimensionality allows the ESD circuit to adapt to multi-layered display structures by providing protection at different height levels and integrating with existing layered architectures.
3Reliability
If conventional ESD protection circuits are used, then the circuit design is simple, but the discharge capability is passive and slow
Solution Approach 1:
The ESD units are pre-configured with multiple metallic layers and conductive terminals positioned to detect and respond to electrostatic discharge conditions. The structure includes pre-established conductive paths through the active layer and metallic layers, ready to activate immediately when ESD occurs, enabling faster response compared to passive circuits.
Solution Approach 2:
The ESD protection circuit incorporates dynamic elements through multiple active layers and metallic layers that can change their electrical characteristics in response to voltage conditions. The conductive terminals and active layers work together to create variable resistance paths that adapt to different voltage specifications and discharge conditions, enabling both active and passive discharge modes.
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 ESD protection circuit effectively neutralizes static electricity in multi-layered structures, providing active and passive discharge capabilities, enhancing the reliability of display devices by preventing damage from electrostatic discharge during manufacturing and usage.
Implementation Method 1
the plurality of first conductive terminals and the plurality of second conductive terminals are electrically connected with different ones of the plurality of first connection terminals, respectively
Data Source
AI summary
An ESD protection circuit, an array substrate and a display device are disclosed. The ESD protection circuit includes a plurality of first ESD units, each of which includes: a first active layer, a first insulating layer, a first metallic layer, a second insulating layer and a second metallic layer which are disposed on a base substrate; the first active layer includes a plurality of first connection terminals; the first metallic layer includes a plurality of first conductive terminals; the second metallic layer includes a plurality of second conductive terminals an orthographic projection of the first metallic layer and an orthographic projection of the second metallic layer the base substrate are at least partly overlapped with an orthographic projection of the first active layer on the base substrate respectively; and the first conductive terminals and the second conductive terminals are electrically connected with different first connection terminals, respectively.