Touch Display Device Segmented Electrode Routing
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Solution Overview
Problem
As the size of display panels increases, the load on touch electrodes and routing lines in touch display devices grows, leading to a decrease in touch sensing accuracy due to increased capacitance and the need for additional routing lines and area arrangements.
Innovation Solution
The implementation of a touch display device design where touch electrode lines are separated and connected to different routing lines, with some routing lines positioned on the active area and others on the non-active area, allowing for electrical connection outside the active area, reducing the load on touch electrodes and routing lines without increasing the channel or area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of display panel increases, then the display area is enlarged, but the load on touch electrodes and routing lines increases leading to decreased touch sensing accuracy
Solution Approach 1:
The touch electrode line is divided into multiple segments (first touch electrode line part and second touch electrode line part) that are separated from each other. Each segment is connected to different routing lines, which reduces the total capacitance of the touch electrode system and improves touch sensing accuracy while maintaining large display panel area.
2Measurement precision
If additional touch routing lines are added to maintain touch sensing performance, then touch sensing accuracy is maintained, but the channel count and area increase
Solution Approach 1:
By segmenting the touch electrode line into multiple parts and connecting each part to separate routing lines, the total capacitance is reduced. This allows maintaining touch sensing accuracy with fewer routing lines, thereby reducing device complexity and channel count.
Solution Approach 2:
The routing lines are arranged in different spatial locations (first routing line in first location, second routing line in second location), utilizing spatial dimensionality to reduce interference and capacitance effects, thereby maintaining sensing accuracy without increasing channel count.
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 design enhances touch sensing accuracy by reducing the load on touch electrodes and routing lines, preventing bezel and channel increases, and maintaining performance even with larger display panels.
Implementation Method 1
The display devices can sense a touch of the user to the display panel by detecting a change of a capacitance occurred by the touch of the user
Data Source
AI summary
A touch display device is disclosed. Since a touch electrode line included in the display device is divided into two or more touch electrode line parts connected to different touch routing lines, an entire load of the touch electrode line and the touch routing line can be reduced. As a portion of the touch routing line is disposed on an active area and touch routing lines connected to different touch electrode line parts are connected to each other between the active area and a touch driving circuit, an entire load can be reduced without an increase of a non-active area and an increase of a channel due to the touch routing lines, and a performance of a touch sensing can be improved.