TFT Array Substrate Line Layout for Electrostatic Discharge Protection
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Solution Overview
Problem
Conventional thin film transistor array substrates are vulnerable to electrostatic discharge during manufacturing, leading to defects such as short-circuits and display quality issues like white or black lines due to accumulated electrostatic charges, which complicates the layout and reduces production efficiency.
Innovation Solution
The design includes semiconductor lines and floating conductors that manage electrostatic charges by positioning the end parts of data and scan lines in a way that prevents excessive electrostatic discharge, allowing charges to be transmitted and diminished, eliminating the need for antistatic devices in the peripheral area and simplifying the layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end part of data line exceeds the outmost scan line and the end part of scan line exceeds the outmost data line, then the electrostatic discharge damage occurs to the semiconductor layer, but the layout complexity increases and production efficiency decreases
Solution Approach 1:
The patent converts the harmful electrostatic discharge phenomenon into a beneficial protective mechanism by designing the data line and scan line to mutually exceed each other, creating a protective structure where the lines extend beyond the opposite line's boundary to prevent electrostatic charges from damaging the semiconductor layer, thereby eliminating the need for additional electrostatic protection devices
Solution Approach 2:
The data lines and scan lines serve their dual function of signal transmission and electrostatic protection simultaneously. The lines protect themselves and each other from electrostatic discharge damage through their own geometric configuration, eliminating the need for separate protective devices and simplifying the overall layout
2Reliability
If electrostatic protection devices are added to prevent short-circuits, then the reliability improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The data lines and scan lines automatically perform electrostatic protection functions through their geometric configuration where each line extends beyond the opposite line's boundary. This self-protective mechanism eliminates the need for additional electrostatic protection devices, simplifying the manufacturing process while maintaining high reliability
3Productivity
If the end part of data line and scan line are positioned to prevent electrostatic discharge, then the productivity improves, but the line length and area increase
Solution Approach 1:
The patent merges the functions of signal transmission and electrostatic protection into a single geometric configuration. The data lines and scan lines are designed to extend beyond each other's boundaries, creating a mutual protection structure that prevents electrostatic discharge without requiring separate protective elements, thereby maintaining production efficiency while minimizing additional line length
Data Source
AI summary
A thin film transistor (TFT) array substrate for reducing electrostatic discharge damage includes a substrate, a plurality of pixel units, scan lines and data lines. The substrate has a pixel area and a peripheral area adjacent to the pixel area. The pixel units are disposed in the pixel area. The scan lines and data lines are disposed in the pixel area of the substrate and electrically connected with the pixel units, wherein one end of each scan line extending to the peripheral area is a bonding pad for the scan line. One end of each data line extending to the peripheral area is a bonding pad for the data line. The other end of each data line extending to the peripheral area is an end part of the data line. Particularly, the end part of the data line does not exceed the outmost scan line.