ESD Protection Circuit for Display Panel Output Pins
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Solution Overview
Problem
The electrostatic discharge (ESD) phenomenon in liquid crystal display panels frequently damages the output pins, leading to reduced yield due to irregular electrostatic jumps from the input pin to the output pin during signal transmission.
Innovation Solution
An electrostatic protection circuit is designed using high and low potential electrostatic output lines and P-type and N-type thin film transistors, which transfers electrostatic discharge to the protection circuit, preventing damage to the output pins by turning on/off specific transistors based on discharge potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signal is transmitted through the integrated chip from input pin to output pin, then signal transmission function is achieved, but electrostatic discharge damages the output pin
Solution Approach 1:
The patent introduces a protection circuit as an intermediary component between the output pin and the digital signal transmission path. This protection circuit includes specific transistors and connection structures that intercept and redirect electrostatic discharge away from the output pin, allowing the output pin to maintain its signal transmission function while being protected from electrostatic damage through the mediating protection circuitry.
2Reliability
If electrostatic discharge protection is added to protect output pin, then output pin reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the electrostatic protection function with the existing digital signal transmission circuitry by integrating protection transistors and connection structures into the same circuit block. The protection circuit shares components and spatial arrangement with the signal transmission path, combining protection functionality with the existing circuit architecture rather than adding completely separate protection components.
Solution Approach 2:
The protection circuit is designed to serve multiple functions: it protects the output pin from electrostatic discharge while maintaining compatibility with the digital signal transmission function. The same circuit structure handles both normal signal operation and electrostatic discharge protection, making the protection mechanism universal rather than specialized for a single function.
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 solution effectively transfers electrostatic discharge away from the output pins, enhancing the antistatic ability of the display panel and protecting the output pins from damage.
Implementation Method 1
the electrostatic discharge, ESD phenomenon of the circuit in the liquid crystal display panel is serious
Implementation Method 2
a drain of the first P-type thin film transistor connected to a source of the second P-type thin film transistor
Data Source
AI summary
An electrostatic protection circuit of a display panel includes a first P-type thin film transistor having a gate connected to a high potential electrostatic output line and a drain connected to a high potential electrostatic output line, a second P-type thin film transistor having a gate connected to a high potential electrostatic output line and a drain connected to a source of the first P-type thin film transistor, and a source connected to the electrostatic signal input line; a first N-type thin film transistor having a gate connected to the low potential electrostatic output line, and a drain connected to the low potential electrostatic output line; a second N-type thin film transistor having a gate connected to the low potential electrostatic output line and a drain connected to the source of the first N-type thin film transistor, and a source connected to the electrostatic signal input line.