Integrated Touch Sensor with Shared-Layer TFT Driver
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Solution Overview
Problem
Existing touch sensors require separate components for touch sensing and driving signals, which can complicate integration with display devices and limit their application in user interface technologies.
Innovation Solution
A touch sensor design that integrates electrodes and a touch driver with thin film transistors on a substrate, where the touch driver includes a semiconductor layer, gate electrode, and source and drain electrodes, and connection patterns are formed in the same layer as the electrodes, allowing for efficient transmission of driving signals to sensing and driving cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate components are used for touch sensing and driving signals, then the functional separation is clear, but the device complexity increases and integration with display devices becomes complicated
Solution Approach 1:
The patent merges the touch sensing electrodes and driving signal transmission components into a single integrated structure. The same electrode patterns serve dual purposes: as sensing electrodes for detecting touch positions and as driving signal transmission paths for controlling the touch sensor array. This integration eliminates the need for separate component layers, reducing overall device complexity while maintaining functional capabilities.
Solution Approach 2:
The electrode patterns in the patent are designed to perform multiple functions simultaneously. They act as sensing electrodes for capacitance-based touch detection, as driving signal transmission conduits for applying voltages to touch sensor elements, and as part of the overall touch controller interface. This multi-functionality reduces the number of required components and simplifies the overall device architecture.
2Productivity
If integration is implemented, then the device becomes more compact and efficient, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the integrated electrode structure into distinct functional regions that can be independently optimized during manufacturing. The electrode patterns are divided into sensing regions for touch detection and driving signal transmission regions, allowing separate process optimization for each function while maintaining overall integration. This segmentation reduces the cumulative precision requirements compared to fully monolithic integration.
Solution Approach 2:
The patent utilizes multi-layer electrode structures where sensing and driving functions are distributed across different vertical layers. This dimensional separation allows independent manufacturing and alignment of each layer's electrode patterns, reducing the precision requirements compared to planar integration. The vertical stacking enables functional integration without requiring all components to be perfectly aligned in a single plane.
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 integration enables more compact and efficient touch sensing capabilities, enhancing the user interface by providing accurate touch position detection and pressure sensing, and allowing for the recognition of fingerprints and palm prints, thus expanding the application of touch sensors in display devices.
Implementation Method 1
a touch driver disposed on the non-active region, the touch driver including thin film transistors that transmit a driving signal to each of the driving cells
Implementation Method 2
a gate electrode disposed on the semiconductor layer with a first insulating layer interposed therebetween
Implementation Method 3
The additional electrode may form a capacitor together with the gate electrode
Data Source
AI summary
A touch sensor includes: a substrate that includes active and non-active regions; driving cells disposed on the active region that extend in a first direction; sensing cells disposed on the active region that extend in a second direction that intersects the first direction; a first connection pattern that connects adjacent driving cells; a second connection pattern that connects adjacent sensing cells; and a touch driver disposed on the non-active region that includes thin film transistors that transmit a driving signal to each of the driving cells. The thin film transistor includes: a semiconductor layer; a gate electrode disposed on the semiconductor layer with a first insulating layer interposed therebetween; and source and drain electrodes connected to the semiconductor layer and spaced apart from each other. The first connection pattern is disposed in the same layer as at least one of the source or drain electrodes or the gate electrode.