LCD Array Substrate Static Protection Circuit Design
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Solution Overview
Problem
Static electricity induced during the formation of electrodes and lines on the array substrate of liquid crystal display (LCD) devices can disrupt the operation of thin film transistors, reducing production yield due to unwanted charge accumulation at the drive IC and test pads.
Innovation Solution
Incorporating static electricity protecting units connected to the test pads and the common voltage line, which redirect and distribute static electricity uniformly across the liquid crystal panel, maintaining an equipotential condition and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test pads and drive IC are formed on the array substrate, then signal testing and device operation are enabled, but static electricity accumulates at these components causing damage and reducing production yield
Solution Approach 1:
A static electricity protecting unit is introduced as an intermediary component between the test pads/drive IC and the common voltage line. This protecting unit acts as a mediator that safely channels static electricity away from sensitive components to the common voltage line, preventing damage while maintaining normal device operation.
Solution Approach 2:
The static electricity that would normally cause damage is redirected through the protecting unit to the common voltage line, converting a harmful factor into a controlled electrical path. The protecting unit enables the static charge to be safely discharged through the common voltage line rather than damaging the drive IC or test pads.
2Productivity
If static electricity protecting units are added to prevent static damage, then production yield and reliability improve, but device structure and manufacturing complexity increase
Solution Approach 1:
The static electricity protecting unit is merged with the existing common voltage line structure. By utilizing the already-present common voltage line as the discharge path, the design avoids adding completely separate static protection circuits, thereby reducing the increase in device complexity while still achieving improved production yield through enhanced static protection.
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
Prevents damage from static electricity to the drive IC and test pads, ensuring stable operation of the LCD device by uniformly distributing static electricity across the panel, thus enhancing production yield and device reliability.
Implementation Method 1
redirect and distribute static electricity uniformly across the liquid crystal panel, maintaining an equipotential condition
Data Source
AI summary
An array substrate for a liquid crystal display device includes a substrate having a display region and a non-display region at a periphery of the display region; a gate line, a data line, a thin film transistor and a pixel electrode on the substrate and in the display region; a drive integrated circuit on the substrate and in the non-display region; first and second test pads at both sides of the drive integrated circuit, respectively; a common voltage line on the substrate and along edges of the non-display region; and first and second static electricity protecting units on the substrate and in the display region, the first static electricity protecting unit connecting the first test pad with the common voltage line, and the second static electricity protecting unit connecting the second test pad with the common voltage line.