LCD Array Substrate Gate Short-Circuit Bar Static Discharge Protection
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Solution Overview
Problem
In the manufacturing process of LCD array substrates, static discharge during the formation of the gate metal layer pattern can cause the gate short-circuit bar and gate line metal to burn, leading to electrical defects and a reduced qualified product rate.
Innovation Solution
An array substrate design with a transparent conducting bar positioned below the gate short-circuit bar, where the gate short-circuit bar and data lines are in the same layer, and a second transparent conducting layer is used to connect the gate lines with the gate short-circuit bar through passivation layer via holes, allowing induced charges to balance without burning the gate short-circuit bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate short-circuit bar is used to balance static charges on gate lines, then the static charge balance is achieved, but the gate short-circuit bar and gate line metal are burnt due to static discharge
Solution Approach 1:
The patent introduces a transparent conducting bar as an intermediary component between the gate lines and the gate short-circuit bar. This transparent conducting bar serves as a mediator that allows static charges to be balanced gradually through its higher resistance, preventing direct discharge through the gate short-circuit bar and avoiding damage to the gate line metal while still achieving static charge balance
Solution Approach 2:
The patent changes the resistance parameter by introducing a transparent conducting bar with higher resistance than the gate short-circuit bar. This parameter change allows the static charges to be balanced more slowly and safely, preventing the high current peak that causes burning while still achieving the necessary charge balance function
2Object-affected harmful factors
If the gate short-circuit bar is made with smaller width, then the damage from static discharge is reduced, but the charge balancing capability is weakened
Solution Approach 1:
The patent segments the charge balancing function into two parts: the transparent conducting bar handles the charge balancing function with its larger width and higher resistance, while the gate short-circuit bar maintains its smaller width to minimize damage risk. This segmentation allows each component to optimize its dimensions for its specific function
Solution Approach 2:
The transparent conducting bar acts as an intermediary that carries the charge balancing function, allowing the gate short-circuit bar to maintain a smaller width without compromising charge balancing capability. The intermediary absorbs the charge balancing task while protecting the vulnerable gate short-circuit bar
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 transparent conducting bar's larger width and higher resistance prevent static discharge damage, enabling normal detection and repair of electrical defects, thus improving the qualified product rate of LCD array substrates.
Implementation Method 1
the induced charges accumulated on different potentials of the gate lines may transfers and achieve balance via the gate short-circuit bar
Implementation Method 2
the gate metal layer pattern will induce static charge under the action of the plasma electric field
Implementation Method 3
Plasma enhanced chemical vapor deposition is performed on the array substrate which has formed a gate metal layer pattern so as to form a gate insulator layer
Data Source
AI summary
The present invention provides an array substrate of LCD display and a manufacturing method thereof, the array substrate comprises a transparent substrate, gate lines and data lines which are disposed on the transparent substrate, wherein the array substrate further comprises: a transparent conducting bar and a gate short-circuit bar which are disposed on the transparent substrate, said transparent conducting bar is disposed below said gate short-circuit bar, said gate short-circuit bar and said data lines are arranged in a same layer. The present invention can avoid the problem of burning the gate short-circuit bar due to the occurrence of static discharge, the electrical defects in the array substrate can be normally detected and repaired in the array test process, thus the qualified product rate of the array substrate of LCD display is improved.