Touch Display Device With Shared Touch Line And Driving Transistors

Solution Overview

Problem

As touch display devices increase in size or touch resolution, the number of touch electrodes required increases, leading to a corresponding increase in the number of touch lines, touch pads, and touch channels, which complicates the structure and increases manufacturing costs.

Innovation Solution

The implementation of an advanced touch sensor structure that reduces the number of touch lines, touch pads, and touch channels by using a configuration with first and second touch electrodes, touch driving transistors, and control transistors, where the touch driving signal is supplied through a single touch line, and control transistors are disposed in the non-display area to manage the touch driving transistors in the display area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the number of touch electrodes increases to enhance touch resolution or device size, then touch sensing capability is improved, but the number of touch lines, touch pads, and touch channels increases causing structural complexity and increased manufacturing costs

Engineering Contradiction:

Improvetouch resolutionVSAvoidstructure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Multiple touch electrodes are electrically connected to a single touch line through touch driving transistors, allowing several electrodes to share one touch line. This merging approach reduces the number of touch lines, touch pads, and touch channels required, thereby simplifying the overall structure while maintaining the ability to detect touches at multiple electrode locations for high resolution

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

A single touch line serves multiple functions by being shared among multiple touch electrodes through the control of touch driving transistors. The touch line can sequentially or simultaneously connect to different electrodes based on driving signals, making one touch line perform the function of multiple dedicated lines, thus reducing structural complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If the number of touch electrodes increases to enhance touch resolution or device size, then touch sensing capability is improved, but manufacturing costs increase due to more touch lines and touch channels

Engineering Contradiction:

Improvetouch resolutionVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

Multiple touch electrodes are electrically connected to a single touch line through touch driving transistors, allowing several electrodes to share one touch line. This merging approach reduces the number of touch lines, touch pads, and touch channels required, thereby simplifying the overall structure while maintaining the ability to detect touches at multiple electrode locations for high resolution

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

A single touch line serves multiple functions by being shared among multiple touch electrodes through the control of touch driving transistors. The touch line can sequentially or simultaneously connect to different electrodes based on driving signals, making one touch line perform the function of multiple dedicated lines, thus reducing structural complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If more touch lines and touch pads are used to support more touch electrodes, then touch sensing capability is improved, but the touch circuit becomes more complicated and size increases

Engineering Contradiction:

Improvetouch sensing accuracyVSAvoidtouch circuit complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Multiple touch electrodes are electrically connected to a single touch line through touch driving transistors, allowing several electrodes to share one touch line. This merging approach reduces the number of touch lines, touch pads, and touch channels required, thereby simplifying the overall structure while maintaining the ability to detect touches at multiple electrode locations for high resolution

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces a time dimension to the touch sensing operation by sequentially activating different touch driving transistors connected to the same touch line. This temporal multiplexing allows a single touch line to serve multiple electrodes at different time intervals, effectively reducing the spatial complexity of the circuit while maintaining full touch sensing capability across all electrodes

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS11803271B2Touch display device

Publication Date: 2023.10.31 LG DISPLAY CO LTD

AI summary

A touch display device can include first and second touch electrodes spaced apart from each other, a first touch line to which a first touch driving signal is applied, a first touch driving transistor configured to control a connection between the first touch electrode and the first touch line, and a second touch driving transistor configured to control a connection between the second touch electrode and the first touch line. As the first touch driving transistor is turned on, a first touch driving signal can be supplied to the first touch electrode through the first touch line, and as the second touch driving transistor is turned on, the first touch driving signal can be supplied to the second touch electrode through the first touch line.