Flat Protection Layer for Electrophoretic Display ESD Corrosion
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Solution Overview
Problem
Electrostatic discharge during the manufacturing of electrophoretic display devices causes damage to the components, leading to abnormal displaying and panel defects due to electrostatic charge accumulation and corrosion from ions and water vapor in humid environments.
Innovation Solution
A method involving six mask processes to form a display device structure with an electrostatic protection circuit and a flat layer that overlaps the data and scan line regions, preventing electrostatic charge and vapor from reaching the metal layers by directly connecting the first and second metal layers without an additional third metal layer, and using materials like resin, silicon nitride, or Benzocyclobutene polymer for the flat layer to protect against corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a third metal layer is used to connect the first and second metal layers, then the electrical connection is achieved, but the electrostatic discharge damage and corrosion risk increase
Solution Approach 1:
The patent removes the third metal layer from the structure, eliminating the harmful effects of electrostatic discharge and corrosion associated with it. The first and second metal layers are directly connected through patterned amorphous silicon regions, achieving electrical connection without the intermediate metal layer that causes damage.
Solution Approach 2:
The patent introduces patterned amorphous silicon regions as an intermediary between the first and second metal layers. This amorphous silicon layer serves as both an insulating layer and a connection medium, allowing electrical connection while protecting against electrostatic discharge and corrosion that would occur with a metal intermediary.
2Reliability
If the flat layer is extended to cover the data line and scan line fan-in regions, then the protection against electrostatic discharge and corrosion is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the flat layer extension with the existing insulating layer structure. The same insulating layer that provides electrical isolation is extended to cover the data line and scan line fan-in regions, providing dual functionality as both an insulator and a protective layer against electrostatic discharge and corrosion, thereby avoiding additional manufacturing steps.
3Reliability
If additional protective layers and extensions are added to prevent electrostatic discharge, then the product reliability improves, but the manufacturing process complexity increases
Solution Approach 1:
The patent makes the insulating layer multi-functional by extending it to cover not only the active display region but also the data line and scan line fan-in regions. This single layer provides electrical isolation, electrostatic discharge protection, and corrosion prevention, eliminating the need for separate protective layers and simplifying the manufacturing process.
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 method effectively prevents electrostatic discharge and corrosion, enhancing the manufacturing yield and life cycle of electrophoretic display devices by ensuring the metal layers are protected from electrostatic charges and water vapor, thereby reducing panel defects and improving display stability.
Implementation Method 1
forms a first insulation layer and an amorphous silicon layer on the first metal layer... patterns the first insulation layer with a third mask process to form a first opening for exposing part of the first metal layer
Implementation Method 2
using materials like resin, silicon nitride, or Benzocyclobutene polymer for the flat layer to protect against corrosion
Data Source
AI summary
A display device structure includes a substrate having an active region and an electrostatic protection circuit region. The first metal layer, the first insulation layer, and an amorphous silicon layer are sequentially disposed on the substrate; the first opening passes through the first insulation layer for exposing part of the first metal layer. The second metal layer, disposed on the first insulation layer or the amorphous silicon layer, fills the first opening to contact with the first metal layer; the second insulation layer and the flat layer are disposed on the second metal layer, in which the region of the flat layer overlaps the electrostatic protection circuit region. The second opening passes through the second insulation layer and the flat layer for exposing the second metal layer, in which the third metal layer fills the second opening to contact with the second metal layer.