Overlapping Conductive Line Spacing for ESD-Resistant Displays
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Solution Overview
Problem
Display devices are prone to electrostatic damage during fabrication due to electrostatic discharge, which can lead to malfunction and reduced production yield, especially when the passivation layer between metal layers is too thin, causing electrical insulation failure and unwanted connections.
Innovation Solution
Incorporating a design with conductive lines where the distance between overlapping metal layers is optimized to be between 3500 and 4500 angstroms, reducing the likelihood of electrostatic discharge by increasing the distance and thereby minimizing the risk of passivation layer punch-through.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between overlapping metal layers is reduced to minimize device size, then device complexity and area are reduced, but electrostatic discharge risk increases due to passivation layer punch-through
Solution Approach 1:
The patent applies different distance requirements to different regions: in the display region where pixels are located, the distance between overlapping metal layers is maintained at 3500-4500 angstroms to prevent electrostatic discharge, while in the non-display region, the distance can be reduced to 1000-2000 angstroms to minimize device area. This local differentiation resolves the contradiction between device miniaturization and electrostatic protection.
2Area of stationary object
If the passivation layer thickness is reduced to enable closer metal layer spacing, then device area decreases, but manufacturing precision requirements increase to prevent electrical insulation failure
Solution Approach 1:
The patent changes the critical parameter from passivation layer thickness to metal layer spacing distance. By maintaining a larger distance (3500-4500 angstroms) between overlapping metal layers in the display region, the patent reduces dependence on precise passivation layer thickness control, thereby lowering manufacturing precision requirements while still preventing electrostatic discharge.
3Device complexity
If overlapping metal layers are placed closer together to reduce device thickness, then device complexity is reduced, but harmful electrostatic discharge events increase
Solution Approach 1:
The patent implements spatially differentiated design where the display region maintains larger metal layer spacing (3500-4500 angstroms) to prevent electrostatic discharge, while the non-display region uses reduced spacing (1000-2000 angstroms) to simplify structure. This local quality approach resolves the contradiction between device complexity reduction and harmful electrostatic discharge prevention.
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 reduces electrostatic discharge events, enhancing the reliability and yield of display devices by maintaining electrical insulation and preventing abnormal signal transmission.
Implementation Method 1
maintaining electrical insulation between the first conductive line and the second conductive line
Implementation Method 2
reduces electrostatic discharge events, enhancing the reliability and yield of display devices
Data Source
AI summary
A display device having a non-display region is provided. The display device includes a first conductive line to which a voltage is applied and a second conductive line which is at least partially overlapped with the first conductive line. There is a distance between the first conductive line and the second conductive line in a normal direction of the display device is greater than or equal to 3500 angstroms, and less than or equal to 4500 angstroms.