Display Substrate Test Pad Circuit for Static Discharge Protection
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Solution Overview
Problem
During the array test of display substrates, the contact between a probe and the array test unit often generates static electricity, leading to high voltages that can damage components and result in defective products, particularly in Chip On Film (COF) and Chip On Panel (COP) structures.
Innovation Solution
Incorporating an electrostatic release unit between the signal output pads and test pads in the display substrate, which includes thin film transistors and signal lines to effectively dissipate static electricity, thereby protecting the substrate components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If array test is performed on display substrate, then manufacturing quality detection is improved, but static electricity damage to components occurs
Solution Approach 1:
An electrostatic release unit is introduced as an intermediary component between the test pads and the data signal transmission lines. This unit includes electrostatic release elements (such as diodes or transistors) that act as mediators to safely discharge static electricity generated during probing operations, preventing direct damage to sensitive circuit components while allowing quality detection to proceed
Solution Approach 2:
The electrostatic release elements are pre-configured in the circuit path before testing occurs. These elements provide beforehand protection by creating a safe discharge path for static electricity, cushioning the sensitive components against potential electrostatic damage during the array test process
2Reliability
If electrostatic release unit is added, then component protection is improved, but device complexity increases
Solution Approach 1:
The electrostatic release unit is localized to specific regions where static electricity damage is most critical, rather than implementing a comprehensive protection system throughout the entire display substrate. The electrostatic release elements are strategically placed near sensitive components and test pads, providing targeted protection while minimizing overall circuit complexity
Solution Approach 2:
The electrostatic release elements are designed as simple, low-cost components that can be easily integrated into the existing circuit layout. These elements provide effective protection with minimal complexity, acting as sacrificial components that protect more valuable circuit elements from static damage
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 release unit prevents damage from static electricity during testing, improving product yield and market competitiveness by reducing defects and ensuring the quality of the display substrates.
Implementation Method 1
each of the plurality of electrostatic release elements being configured to release static electricity on the data signal transmission line that is connected with the electrostatic release element
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a base substrate, the base substrate includes a display region and a periphery region; a plurality of data signal transmission lines, a plurality of signal output pads, a plurality of signal input pads, and a plurality of test pads are located in the periphery region; a plurality of sub-pixels and a plurality of data lines are located in the display region; the plurality of data signal transmission lines are electrically connected with at least part of the plurality of data lines; the periphery region is provided with a plurality of electrostatic release elements located between the plurality of signal output pads and the plurality of test pads, each electrostatic release element is electrically connected with one data signal transmission line and is configured to release static electricity on the data signal transmission line.