Touch Sensor Routing Wire Reduction for Display Devices
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Solution Overview
Problem
The existing touch sensor integrated type display devices face challenges with increasing touch routing wires as the display size grows, leading to reduced touch sensitivity and higher manufacturing costs due to parasitic capacitance and complex line structures.
Innovation Solution
The proposed touch sensor integrated type display device reduces the number of touch routing wires by rearranging the connection configuration of touch electrodes and routing wires, using a matrix arrangement with specific routing wire patterns to connect touch electrodes, thereby minimizing parasitic capacitance and maintaining touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of touch routing wires is increased to support larger display sizes, then the touch coverage area is improved, but the parasitic capacitance increases and touch sensitivity deteriorates
Solution Approach 1:
The patent segments the touch electrode connections by dividing them into two independent sets: first touch electrodes connected to first touch routing wires, and second touch electrodes connected to second touch routing wires. This segmentation allows each routing wire to serve fewer electrodes, reducing the total number of routing wires needed while maintaining comprehensive touch coverage across the display area.
Solution Approach 2:
The patent introduces a dual-routing-dimension approach where touch routing wires are arranged in different spatial dimensions or patterns. By utilizing multiple routing dimensions and alternating connection patterns, the design achieves comprehensive electrode coverage with fewer wires, thereby reducing parasitic capacitance while maintaining large-area touch functionality.
2Area of stationary object
If the number of touch routing wires is increased to connect more touch electrodes, then the touch electrode coverage is improved, but the device complexity increases
Solution Approach 1:
The patent divides the touch electrode array into two independent groups with separate routing wire connections. This segmentation simplifies the overall line structure by creating two independent, manageable routing systems rather than one complex comprehensive routing system, making the design easier to manufacture and maintain while covering the same area.
Solution Approach 2:
Instead of connecting all touch electrodes through a single complex routing network, the patent inverts the approach by using multiple independent simplified routing networks. Each routing wire connects to a specific subset of electrodes, and the combination of these simpler independent networks achieves the same coverage as a single complex network would provide.
3Object-affected harmful factors
If more touch routing wires are used to maintain touch sensitivity across larger areas, then the touch sensitivity is improved, but the manufacturing cost increases
Solution Approach 1:
By segmenting the touch electrode connections into two independent sets with separate routing wires, the patent reduces the total number of routing wires required compared to a traditional single-network design. This reduction directly lowers manufacturing costs while maintaining touch sensitivity across the entire display area through the distributed routing approach.
Solution Approach 2:
The patent changes the routing wire configuration parameters by introducing a dual-set arrangement with different connection patterns. This parameter change optimizes the balance between touch sensitivity maintenance and manufacturing cost reduction, achieving comparable or improved sensitivity with fewer wires and lower production expenses.
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 configuration significantly reduces the number of touch routing wires by about 65% compared to traditional designs, improving touch sensitivity and reducing manufacturing costs while preventing the increase in touch IC size.
Implementation Method 1
measures changes in a capacitance of each independent pattern, thereby deciding whether or not a touch operation is performed
Data Source
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AI summary
A touch sensor integrated type display device includes gate lines (GL1, GL2, ..., GL6) and data lines (DL1, DL2, ..., DL6), pixel electrodes (P11, P12, ..., P66), and touch electrodes (Tx11, Tx12, ..., Tx81) arranged in a matrix with a row direction and a column direction. The touch electrodes (Tx11, Tx12, ..., Tx81) include first (1-1), third (1-2), second (2-1), and fourth (2-2) touch electrodes respectively connected to first (1-1) (TWX1, TWX3, TWXS, TWX7), third (1-2) (TWX2, TWX4, TWX6, TWX8), second (2-1) (TWP12, TWP32, TWP52, TWP72, ..., TWP78), and fourth (2-2) touch routing wires (TWY1, TWY2, ..., TWY5). The first (1-1) touch routing wire (TWX1, TWX3, TWX5, TWX7) connect first (1-1) touch electrodes and is arranged in the row direction. The second (2-1) touch routing wires (TWP12, TWP32, TWP52, TWP72, ..., TWP78) are respectively connected to second (2-1) touch electrodes and arranged in the column direction. The third (1-2) touch routing wire (TWX2, TWX4, TWX6, TWX8) connects third (1-2) touch electrodes and is arranged parallel to the first (1-1) touch routing wire (TWX1, TWX3, TWX5, TWX7). The at least one fourth (2-2) touch routing wire (TWY1, TWY2, ..., TWY5) connects fourth (2-2) touch electrodes and is arranged parallel to the second (2-1) touch routing wire (TWP12, TWP32, TWP52, TWP72, ..., TWP78).