Electrostatic Protection Circuit Buffering Static Charges
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Solution Overview
Problem
During the manufacturing process of array substrates, static electricity generated by processes like plasma deposition and film etching can cause electrostatic breakdown and damage to signal lines, leading to defective substrates, which existing electrostatic protection devices fail to adequately address.
Innovation Solution
An electrostatic protection circuit comprising discharge sub-circuits, buffer sub-circuits, and an electrostatic protection line, where each discharge sub-circuit includes two transistors connected to the signal line and electrostatic protection line, and each buffer sub-circuit includes two transistors to temporarily buffer static charges, preventing damage to the discharge sub-circuit and enhancing the reliability of the protection circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple electrostatic protection device (single transistor) is used, then the device complexity is low, but the reliability is insufficient when static electricity damage occurs
Solution Approach 1:
The protection circuit is segmented into multiple functional modules: a discharge sub-circuit with first and second transistors for immediate static electricity discharge, and a buffer sub-circuit with third and fourth transistors for temporary charge buffering. This segmentation allows each module to specialize in specific protection functions, improving overall reliability while managing complexity through modular design.
Solution Approach 2:
The buffer sub-circuit acts as a cushioning mechanism that temporarily stores static charges before they reach the discharge sub-circuit. The third and fourth transistors create a buffer zone that absorbs charge fluctuations, protecting the main discharge path from sudden charge surges and preventing direct damage to critical components.
2Reliability
If multiple transistors are added to improve protection reliability, then the antistatic performance is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
Multiple transistor functions are merged into an integrated protection circuit where the first and second transistors work together in the discharge sub-circuit, and the third and fourth transistors cooperate in the buffer sub-circuit. This merging approach consolidates the protection function into a unified structure that achieves high reliability while managing manufacturing complexity through functional integration.
3Reliability
If a buffer sub-circuit is added to temporarily store charges, then the protection circuit reliability is improved, but the device complexity increases
Solution Approach 1:
The buffer sub-circuit performs preliminary action by temporarily storing static charges before they reach the discharge sub-circuit. The third and fourth transistors are configured to capture and hold charges in a buffer state, preparing the system for controlled discharge and preventing direct冲击 to the main circuit components.
Data Source
AI summary
An electrostatic protection circuit and a manufacturing method thereof, an array substrate and a display apparatus in the field of display technology are provided. This electrostatic protection circuit includes: a discharge sub-circuit, a buffer sub-circuit and an electrostatic protection line, wherein the electrostatic protection line is a common electrode line; the buffer sub-circuit includes a third transistor and a fourth transistor; a gate and a second electrode of the third transistor are both connected to a first electrode of the fourth transistor, and the first electrode of the third transistor is connected to a signal line; a gate and a second electrode of the fourth transistor are both connected to the signal line.