Electronic Paper Circuit Bridge Spacing to Prevent Erosion
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Solution Overview
Problem
Electronic paper display devices face issues with incomplete figure display due to microcapsule breakage and electrophoresis solution leakage, which causes erosion of metal contact holes in the circuit bridge structure, leading to defects.
Innovation Solution
The design includes a display device with a substrate, pixel array, circuit bridge structure, and two-section trace regions (first and second trace regions) where the display film layer is spaced apart from the circuit bridge structure, preventing direct contact and potential erosion of contact holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the circuit bridge structure is placed close to the pixel array for compact design, then device integration is improved, but the contact holes are more susceptible to erosion from electrophoresis solution leakage
Solution Approach 1:
The trace structure is divided into two distinct regions: a first trace region made of metal material that provides electrical connection, and a second trace region made of insulating material that acts as a protective barrier. This segmentation allows the circuit to function while preventing electrophoresis solution from reaching and eroding the metal contact holes, thus resolving the contradiction between compact integration and contact hole integrity.
2Area of stationary object
If the display film layer extends close to the circuit bridge structure to maximize display area, then display area is improved, but the risk of electrophoresis solution contact with metal structures increases
Solution Approach 1:
The second trace region made of insulating material serves as an intermediary barrier between the display film layer containing electrophoresis solution and the metal structures of the circuit bridge. This intermediary layer allows the display area to extend close to the circuit while preventing harmful chemical contact, thus resolving the contradiction between maximizing display area and preventing solution contact.
3Reliability
If metal contact holes are used for electrical connection, then electrical conductivity is improved, but chemical erosion from electrophoresis solution causes defects
Solution Approach 1:
The harmful metal material is extracted from the second trace region and replaced with an insulating material that does not react with electrophoresis solution. The metal is retained only in the first trace region where it is protected from solution contact, while the second trace region uses insulating material to provide both electrical isolation and chemical protection, thus eliminating chemical erosion while maintaining electrical connectivity.
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 the circuit bridge structure from being eroded by electrophoresis solution leakage, thereby maintaining complete figure display and reducing defects in electronic paper devices.
Implementation Method 1
The electronic ink layer of the electronic paper includes electrophoresis solution and white, black, or color particles suspended in it. By applying voltage to the display medium layer, these particles may be driven to move so as to display black, white, grayscale or color at each pixel.
Data Source
AI summary
The present disclosure provides a display device. The display device includes a substrate, a pixel array, a circuit bridge structure, a first trace region, a second trace region, and a display film layer. The pixel array is located on the substrate. The circuit bridge structure is located at one side of the pixel array. The first trace region is located between the pixel array and a first side of the circuit bridge structure. The second trace region is located at a second side opposite to the first side. The display film layer is located on the pixel array, and an orthogonal projection of the display film layer on the substrate is spaced apart from an orthogonal projection of the circuit bridge structure on the substrate.