Narrow Border Touch Display with Self-Capacitive Layer
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Solution Overview
Problem
Conventional touch screens with mutual capacitance sensing require complex manufacturing processes and higher costs due to the need for multiple mask processes to form bridging members, limiting the ability to achieve a higher screen-to-body ratio.
Innovation Solution
A narrow border touch display apparatus with a self-capacitive touch-sensing layer where touch-sensing electrodes and leads extend to a wiring area and are mounted on the back surface of the display layer, eliminating the need for bridging members and reducing the manufacturing process to a single mask step, using transparent conductive materials like indium tin oxide and featuring jagged-shaped electrodes for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mutual capacitance sensing with bridging members is used, then touch sensing functionality is achieved, but manufacturing process complexity increases and cost rises
Solution Approach 1:
The patent removes the bridging members from the touch screen structure entirely. By using self-capacitive sensing, the system extracts only the necessary sensing electrodes and eliminates the complex bridging member components, thereby simplifying the manufacturing process while maintaining touch sensing functionality
Solution Approach 2:
The patent inverts the sensing mechanism from mutual capacitance (requiring driving and sensing electrode pairs with bridging members) to self-capacitive sensing (using single sensing electrodes). This inversion fundamentally changes the structure, eliminating the need for bridging members and simplifying the overall design
2Reliability
If bridging members are formed with multiple mask processes, then electrode connectivity is achieved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the bridging members that require multiple mask processes. By using self-capacitive sensing with direct electrode connections, the system reduces the number of manufacturing steps and lowers production costs while maintaining electrode connectivity
Solution Approach 2:
The patent merges the functions of bridging members into the electrode design itself. The sensing electrodes are designed to extend and connect directly to bonding pads, combining the connectivity function that previously required separate bridging members into the electrode structure, thereby simplifying manufacturing
3Reliability
If traditional touch screen structure with bonding pads at bottom frame is used, then electrical connection is achieved, but screen-to-body ratio decreases
Solution Approach 1:
The patent moves the bonding pads from the traditional bottom frame location to the corner regions of the touch screen. This spatial reconfiguration in a different dimensional arrangement allows the display area to extend closer to the edges, increasing the screen-to-body ratio while maintaining electrical connection functionality
Solution Approach 2:
The patent employs asymmetric placement of bonding pads in the corner regions rather than symmetric distribution along the bottom frame. This asymmetric configuration optimizes the use of available space, allowing maximum display area while ensuring proper electrical connections
Data Source
AI summary
A narrow border touch display apparatus is provided and includes a display layer and a self-capacitive touch-sensing layer. The self-capacitive touch-sensing layer is disposed on a surface of the display layer and includes a touch-sensing area and a wiring area adjacent to the touch-sensing area. The touch-sensing area is provided with a plurality of touch-sensing electrodes arranged in a matrix. Each of the touch-sensing electrodes is connected to a lead. The leads extend to the wiring area. A portion of the self-capacitive touch-sensing layer that is located within the wiring area extends over an edge of the display layer and is mounted on another surface of the display layer by bending.