In-Cell Touch Display Perforation via Segmented Electrodes
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Solution Overview
Problem
The manufacturing of In cell touch display devices is complex due to the need to perforate through multiple layers, particularly the high thickness of the flattening layer, which increases technical difficulty and reduces the qualified rate of production.
Innovation Solution
A touch display device structure where the common electrode layer and sensing layer are separated by an insulation layer, with driving and suspension area electrodes connected through driving and suspended wirings, respectively, allowing only the insulation layer to be perforated, reducing the thickness of the layers to be pierced and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the flattening layer and gate insulation layer are perforated through to arrange driving wiring, then the driving wiring can be connected, but the manufacturing complexity increases and qualified rate decreases
Solution Approach 1:
The patent divides the common electrode layer into multiple independent electrode regions (driving area electrodes and sensing area electrodes) that are electrically isolated from each other. This segmentation eliminates the need for complex through-perforation of multiple layers, as each electrode region can be independently formed and connected through simpler via structures, thereby reducing manufacturing complexity and improving qualified rate.
Solution Approach 2:
The patent transitions from a planar wiring arrangement requiring through-perforation to a three-dimensional stacked architecture where electrodes are arranged in multiple layers (common electrode layer, sensing layer, touch sensing electrode layer). This dimensional change allows electrical connections to be established through lateral routing and vertical vias without requiring complex through-perforation of the flattening layer and gate insulation layer, thus simplifying the manufacturing process.
2Ease of manufacture
If the flattening layer thickness is reduced to simplify perforation, then the perforation difficulty decreases, but the structural integrity and function may be compromised
Solution Approach 1:
The patent segments the electrode system into multiple independent regions and layers, allowing each to be optimized independently. The flattening layer maintains its original thickness and structural integrity, while the segmented electrode design enables simpler connection structures that do not require thick perforation, thus resolving the contradiction between maintaining structural integrity and reducing perforation difficulty.
Solution Approach 2:
The patent introduces intermediate connection structures (such as local via holes and lateral connection lines within the common electrode layer) that serve as mediators between the driving area electrodes and sensing area electrodes. These intermediary structures eliminate the need for direct through-perforation of the thick flattening layer, allowing the flattening layer to maintain its full thickness and structural integrity while still achieving the necessary electrical connections.
3Ease of manufacture
If multiple layers are perforated through for driving wiring arrangement, then the wiring can be connected, but the technical difficulty increases
Solution Approach 1:
The patent merges the functions of multiple separate wiring layers into a unified common electrode layer structure. The driving area electrodes and sensing area electrodes are both formed within the same common electrode layer, eliminating the need for separate wiring layers and complex through-perforation arrangements. This merging reduces technical difficulty while maintaining the necessary electrical connections.
Solution Approach 2:
The patent utilizes vertical stacking of functional layers (common electrode layer, sensing layer, touch sensing electrode layer) to resolve the complexity of lateral wiring arrangements. By transitioning to a three-dimensional architecture, the patent eliminates the need for complex through-perforation of multiple lateral layers, as connections are established through controlled vias between stacked layers rather than through complex routing in the same plane.
Data Source
AI summary
A touch display device and an electronic apparatus are disclosed. The touch display device comprises a sensing layer, an insulation layer, and a common electrode layer arranged in sequence. The common electrode layer comprises driving areas, suspension areas, and driving wirings. The sensing layer comprises suspended connection lines. According to the present disclosure, the technical difficulty of hole-digging thereof can be reduced effectively, the structure of the product can be simplified, and the qualified rate of the product can be improved.