TFT Array Substrate Electrostatic Protection via Peripheral Conductive Ring
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Solution Overview
Problem
Conventional methods for preventing electrostatic breakdown during the manufacturing of TFT-LCD array substrates are ineffective as they rely on electrostatic rings that function only after the substrate is fully manufactured, leaving it vulnerable to electrostatic charges generated during processes like CVD and dry etching, which can lead to reduced product yield.
Innovation Solution
Incorporating a closed conductive ring on the same layer as the conductive lines in the peripheral region of the substrate, connecting the conductive lines to this ring, allowing electrostatic charges to be directed away from sensitive areas, thereby preventing breakdown during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic ring is provided along the peripheral of the array substrate to prevent electrostatic breakdown, then the liquid crystal panel is protected from electrostatic discharge, but the electrostatic ring cannot perform the function of preventing electrostatic breakdown during the manufacturing process of the array substrate
Solution Approach 1:
The patent applies preliminary action by forming the electrostatic ring and connecting TFT structures before completing the array substrate manufacturing process. This allows the electrostatic protection function to be established in advance, enabling the ring to capture and discharge electrostatic charges generated during CVD and dry etching processes, thereby protecting the substrate during manufacturing rather than only after completion.
2Reliability
If conventional electrostatic ring methods are used, then the liquid crystal panel is protected after manufacturing, but electrostatic charges generated during CVD and dry etching processes can still cause electrostatic breakdown and reduce product yield
Solution Approach 1:
The electrostatic ring and connecting TFT structures are formed before the array substrate manufacturing is completed, establishing protection in advance against electrostatic charges generated during CVD and dry etching processes, thereby preventing breakdown and maintaining high product yield
Solution Approach 2:
The patent introduces TFT structures as intermediary elements that connect the conductive lines to the electrostatic ring. These TFT structures act as mediators that automatically turn on to channel electrostatic charges from the conductive lines to the electrostatic ring during manufacturing processes, providing active protection rather than passive structure
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
Effectively prevents electrostatic breakdown during the manufacturing process by redirecting charges away from critical components, enhancing the yield and reliability of TFT-LCD array substrates.
Implementation Method 1
An electrostatic ring is based on the principle that electrostatic charges tend to distribute along the outer edge of a conductor
Data Source
AI summary
An embodiment of the disclosed technology provides a method for preventing electrostatic breakdown during the manufacturing process of the array substrate. The method comprises: when forming a conductive pattern of a substrate, connecting conductive lines for forming the conductive pattern with a closed conductive ring on a same layer as the conductive lines in a peripheral region of the substrate, and wherein when electrostatic charges are generated over the metal line, the electrostatic charges are led to the closed conductive ring.