Display Substrate Layer Separation for Pad-to-Line ESD Control
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Solution Overview
Problem
Static electricity generated during the manufacturing process of liquid crystal display substrates can cause poor display effects, such as bright lines or spots, due to electrostatic discharge between contact pads and conductive connection lines, leading to interference with signal transmission and potential breakdown at transition holes.
Innovation Solution
The display substrate design includes contact pads and conductive connection lines in different conductive layers, spaced apart to prevent the formation of tip electric fields and reduce electrostatic discharge, thereby minimizing display defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If contact pads and conductive connection lines are placed in the same layer, then the manufacturing process is simpler, but electrostatic discharge occurs causing display defects
Solution Approach 1:
The patent applies dimensionality change by moving contact pads and conductive connection lines from the same planar layer to different vertical layers. Specifically, contact pads are positioned in one conductive layer while conductive connection lines are positioned in another conductive layer above or below, creating vertical separation. This spatial reconfiguration in the third dimension (height) eliminates electrostatic discharge issues while preserving manufacturing feasibility through multi-layer conductor formation processes.
2Area of stationary object
If contact pads and conductive connection lines are placed close to each other, then the aperture ratio is improved, but tip electric fields form causing electrostatic discharge
Solution Approach 1:
The patent resolves the contradiction between aperture ratio and electrostatic discharge by utilizing vertical layering. Contact pads and conductive connection lines can be positioned close together in the planar view to maximize aperture ratio, while simultaneously separating them in the vertical dimension by placing them in different conductive layers. This eliminates tip electric field formation and electrostatic discharge without sacrificing display area.
3Reliability
If contact pads and conductive connection lines are in different layers, then electrostatic discharge is prevented, but the device structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the conductor structure into multiple distinct conductive layers. Contact pads are formed in one conductive layer while conductive connection lines are formed in separate conductive layers, with insulating layers positioned between them. This segmentation prevents electrostatic discharge by eliminating direct contact and tip electric field formation, while the modular layered structure allows for systematic manufacturing processes.
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
This design effectively prevents electrostatic discharge and reduces display defects by ensuring that contact pads and conductive connection lines are in separate layers, maintaining stable signal transmission and reducing breakdown risks at transition holes.
Implementation Method 1
Static electricity generated during the manufacturing process of liquid crystal display substrates can cause poor display effects, such as bright lines or spots, due to electrostatic discharge between contact pads and conductive connection lines
Data Source
AI summary
A display substrate, a manufacturing method thereof and a display device are provided. The display substrate includes a display region, a peripheral region a plurality of signal lines configured to provide signals to the display region; a plurality of contact pads configured to be electrically connected with the plurality of signal lines; at least two conductive connection lines provided on a side of the plurality of contact pads facing away from the display region. The at least two conductive connection lines include a first conductive connection line closest to the plurality of contact pads in a first direction from the display region to the peripheral region. At least part of the plurality of contact pads are provided in a first conductive layer, the first conductive connection line is provided in a second conductive layer, and the first conductive layer and the second conductive layer are different layers.