Integrated Touch Display Bridge Electrode Fabrication
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Solution Overview
Problem
The fabrication of display apparatuses with integrated touch screens is complex and costly due to the need for a separate mask process to connect bridge electrodes with touch electrodes.
Innovation Solution
A method and structure where bridge electrodes are connected with touch electrodes without a separate mask process by forming bridge electrodes on a layer different from the touch electrodes and using metal plating to fill contact holes, allowing for direct connection during the fabrication of the touch insulating film and electrode layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bridge electrodes and touch electrodes are formed at separate layers requiring a separate mask process, then connection between bridge electrodes and touch electrodes is achieved, but fabrication process complexity increases and production cost rises
Solution Approach 1:
The patent merges the formation of bridge electrodes and touch electrodes into a single mask process. The second touch electrode layer is configured to serve dual purposes: as bridge electrodes for electrical connection and as part of the touch sensing structure. This integration eliminates the need for a separate mask process specifically for connecting bridge electrodes, thereby reducing fabrication process complexity while maintaining connection reliability.
Solution Approach 2:
The second touch electrode layer is designed with multi-functionality, serving both as bridge electrodes for connecting touch signal lines and as functional touch electrodes for sensing. This universal design allows a single layer to fulfill multiple roles, eliminating redundant processing steps and reducing overall device complexity.
2Reliability
If a separate mask process is used to connect bridge electrodes with touch electrodes, then proper electrical connection is established, but production cost increases
Solution Approach 1:
The patent combines the mask process for forming touch electrodes with the mask process for forming bridge electrodes into a single unified process. The second touch electrode layer is patterned to simultaneously create both bridge electrodes and touch electrode structures, eliminating the need for additional masking steps and associated material and labor costs.
Solution Approach 2:
The patent extracts the bridge electrode function from a separate processing step and integrates it into the touch electrode formation process. By removing the redundant separate mask process, the invention reduces production costs while maintaining the essential electrical connection function through the multi-functional second touch electrode layer.
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 approach simplifies the fabrication process, reduces the number of masks required, and lowers production costs while maintaining effective touch functionality.
Implementation Method 1
using metal plating to fill contact holes, allowing for direct connection during the fabrication of the touch insulating film and electrode layers
Data Source
AI summary
A display apparatus and a method for fabricating the same are discussed, in which bridge electrodes can be connected with touch electrodes even without a separate mask process. The display apparatus comprises a light emitting device layer that includes a first electrode arranged on a first substrate, a light emitting layer arranged on the first electrode, and a second electrode arranged on the light emitting layer; and a touch sensing layer arranged on the light emitting device layer, wherein the touch sensing layer includes first and second touch electrode layers and a touch insulating film arranged between the first and second touch electrode layers, and the first touch electrode layer constitutes first and second touch electrodes, and the second touch electrode layer constitutes bridge electrodes and is formed to be filled in a contact hole provided in the touch insulating film and connected with the first touch electrode layer.