Single-Layer Touch Electrode Routing for Capacitive Detection
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Solution Overview
Problem
The manufacturing process of touch panels using the electrostatic capacity method is complicated due to the need for a three-layer structure with detection electrodes and wires on different layers, increasing complexity and cost.
Innovation Solution
A coordinate input device with detection electrodes and routed wires formed on the same layer, allowing for simplified manufacturing by eliminating the need for wires to cross each other, and using a ratio of widths of detection electrodes to calculate capacitance variations for two-dimensional coordinate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detection electrodes and wires are formed on different layers via insulating film to ensure electric insulating state, then electrical insulation is achieved, but manufacturing process becomes complicated with at least three-layer structure
Solution Approach 1:
The patent merges the detection electrodes and routed wires onto the same layer, eliminating the need for multiple insulating layers. This is achieved by designing the routed wires to connect to one ends of the detection electrodes in the first direction, allowing both conductive elements to coexist on a single layer without electrical interference, thus simplifying the manufacturing process from three layers to one layer.
2Measurement precision
If detection electrodes are arranged in different layers via insulating film to detect two-dimensional coordinate, then coordinate detection is enabled, but at least three-layer structure is obtained
Solution Approach 1:
The patent transitions from vertical layering to horizontal arrangement by configuring detection electrodes in detection areas along the first direction and routed wires connecting at one ends in the second direction. This dimensional reorganization allows two-dimensional coordinate detection to be achieved on a single layer, eliminating the need for multiple layers while maintaining detection functionality.
3Reliability
If wires are routed on different layers to connect detection electrodes, then electrical connection is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines the routing of wires and arrangement of detection electrodes on the same layer, which reduces the number of manufacturing steps and materials required. By connecting routed wires to one ends of detection electrodes in the first direction, the design eliminates the need for complex multi-layer wiring, thereby reducing manufacturing cost while ensuring reliable electrical connection.
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 manufacturing process, reduces costs, and improves detection precision by allowing detection electrodes and wires to be formed on the same layer, facilitating the calculation of two-dimensional coordinates with high accuracy.
Implementation Method 1
a detection unit which detects a capacitance variation between the plurality of detection electrodes via the coating film
Implementation Method 2
The electrostatic capacity method indicates a method of flowing weak current by electrostatic capacity formed by touching a finger of a person on a display surface
Data Source
AI summary
Provided is a coordinate input device including: a plurality of detection electrodes which are arranged in a planar shape in a detection area of a substrate; a plurality of routed wires connected to the plurality of detection electrodes; a coating film which coats the plurality of detection electrodes; a detection unit which detects a capacitance variation between the plurality of detection electrodes via the coating film; and a calculation unit which calculates a capacitance forming position from the detected result of the detection unit, wherein the plurality of detection electrodes are formed in the detection area in a first direction and are arranged in a second direction orthogonal to the first direction so as to configure a plurality of detection electrode pairs, each of which is composed of a pair of adjacent detection electrodes, a ratio of the width of one-side detection electrode of the pair of detection electrodes to the width of the other-side detection electrode of the pair of detection electrodes configuring each of the detection electrode pairs is changed according to the first direction, and the plurality of routed wires are connected to one ends of the first direction of the detection electrodes and are formed on the same layer as the plurality of detection electrodes.