Divided Touch Electrode Lines for Large-Area Display Sensing
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Solution Overview
Problem
As display panels increase in size, the load on the path for detecting touch sensing signals increases, leading to reduced accuracy and potential short circuits between touch electrodes, making it difficult to implement a reliable touch sensing function in large-area display devices.
Innovation Solution
The touch electrodes are arranged in a divided structure with X-touch and Y-touch electrode lines, each comprising multiple electrodes connected to each other, and dummy patterns are introduced between these lines to reduce signal load and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch electrodes are disposed in a large-area display panel, then the display area is increased, but the load on the touch sensing signal path increases and accuracy deteriorates
Solution Approach 1:
The touch electrode lines are divided into multiple segments along the signal transmission path. Each segment is electrically isolated from others, creating multiple discrete touch electrode groups. This segmentation reduces the total capacitance load on each sensing path, thereby maintaining touch sensing accuracy in large-area displays while allowing the overall display area to expand.
2Area of stationary object
If touch electrode lines are extended to cover larger areas, then the display coverage is increased, but the risk of short circuit defects between electrodes increases
Solution Approach 1:
Dummy patterns are introduced as intermediary elements between adjacent touch electrode lines. These dummy patterns act as buffer zones that physically separate the electrode lines and prevent direct contact or short circuits between them. The dummy patterns maintain the extended display coverage while providing reliable electrical isolation to prevent short circuit defects.
3Adaptability or versatility
If the number of touch electrodes is increased to improve sensing coverage, then the touch detection capability is enhanced, but the signal path load increases and accuracy decreases
Solution Approach 1:
The touch electrode array is segmented into multiple independent groups along the signal transmission path. Each segment can be independently sensed and processed. This allows the system to maintain high touch sensing coverage across large areas while keeping the capacitance load on each individual sensing path manageable, thereby preserving measurement precision.
Solution Approach 2:
Touch electrodes are arranged in a two-dimensional grid pattern with X-direction and Y-direction electrode lines. This dimensional arrangement allows comprehensive touch coverage across the display area while distributing the sensing load across multiple orthogonal paths, improving both coverage and accuracy simultaneously.
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 arrangement reduces the load on the touch sensing signal path, enhances accuracy, and prevents short circuits, ensuring reliable touch sensing in large-area display devices.
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 electrode line is divided in the active area in a structure in which touch routing lines are coupled to both sides of the touch electrode line, so that resistance and parasitic capacitance may be reduced due to the touch electrode line and the touch routing line. In addition, a dummy pattern is disposed between the divided touch electrode lines, so that it is possible to easily implement an arrangement structure of the touch electrode line with improved touch sensing performance by preventing a short circuit defect between the divided touch electrode lines due to static electricity.