Double Routing Wire Touch Sensor for Display Devices
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Solution Overview
Problem
Touch sensors for display devices, such as OLED and LCD devices, face challenges with increased thickness and reduced visibility due to the single routing wire structure, which results in high resistance values and decreased sensibility.
Innovation Solution
Implementing a double routing wire structure where first and second routing wires are connected to both ends of the touch electrode serials, forming closed-loops or open-loops, and using jumping wires to connect these routing wires with pads, reducing the total resistance value and enhancing sensibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single routing wire structure is used to connect touch electrodes, then the device structure is simple, but the total resistance value is high which decreases touch sensibility
Solution Approach 1:
The routing wire structure is segmented into multiple parallel routing wires (first routing wire and second routing wire) that connect to both ends of the touch electrode serial. This segmentation creates multiple current paths, reducing the total resistance value while maintaining structural organization through systematic segmentation of the connection paths.
Solution Approach 2:
The routing wire structure transitions from a single-dimensional connection to a two-dimensional grid-like structure with wires running in both horizontal and vertical directions. This dimensional expansion allows current to flow through multiple paths simultaneously, reducing resistance without significantly increasing overall device footprint.
2Reliability
If routing wires are extended to reduce resistance, then touch sensibility improves, but the device thickness increases which reduces visibility
Solution Approach 1:
Instead of extending wires in the vertical dimension (thickness direction), the patent uses horizontal and vertical routing wires that spread out in the planar dimensions. This dimensional redirection allows resistance reduction through longer horizontal/vertical paths without increasing device thickness, as the extended paths lie flat within the device plane.
Solution Approach 2:
The patent introduces jumping wires as intermediary elements that connect the horizontal and vertical routing wires at specific points. These jumping wires act as mediators that enable the formation of closed-loop current paths without requiring direct vertical extensions, thus reducing resistance while maintaining a thin profile through efficient use of planar space.
3Reliability
If a double routing wire structure is implemented, then total resistance value is reduced, but the number of processes and manufacturing cost increase
Solution Approach 1:
The first and second routing wires are merged into a unified grid structure that is formed using the same manufacturing processes as the existing touch electrode patterns. The jumping wires are also integrated into the same fabrication sequence, combining multiple functions into a single manufactured assembly rather than separate components requiring additional assembly steps.
Solution Approach 2:
The routing wire structure serves multiple functions simultaneously: it provides electrical connections, reduces resistance through parallel paths, and forms closed-loops for signal integrity. The same routing wire structure is used for both horizontal and vertical electrode connections, eliminating the need for separate connection structures and reducing overall manufacturing complexity.
Data Source
AI summary
This disclosure relates to touch sensors for display devices having a double routing wire structure. The touch sensor includes a plurality of first touch electrode serials and a plurality of second touch electrode serials electrically insulated from each other; a plurality of first routing wires, each of which is respectively connected with at least one of both ends of each of the plurality of first touch electrode serials; a plurality of second routing wires, each of which is respectively connected with each of the plurality of second touch electrode serials; and at least one of a first jumping wire and a second jumping wire, wherein the first jumping wire connects the first routing wire with a first pad, and the second jumping wire connects the second routing wire with a second pad.