Touch Sensing Display Layout for Fewer Channels and Ghost Touches
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Solution Overview
Problem
As display panels enlarge in size, the number of touch electrodes and touch lines increases, leading to low production yield and high manufacturing costs, and the ghost phenomenon occurs during multi-touch inputs where untouched points are abnormally recognized as touch positions.
Innovation Solution
A touch sensing display apparatus with a multi-connection type configuration, where touch electrodes are connected to a touch sensing circuit, and touch blocks are driven sequentially using a time-division method to reduce the number of touch channels and prevent ghost touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If display panels are enlarged in size, then the display area increases, but the number of touch electrodes and touch lines increases leading to low production yield and high manufacturing cost
Solution Approach 1:
Multiple touch electrodes are connected to a single touch line, merging multiple signal paths into one physical conductor. This reduces the total number of touch lines required, thereby improving production yield by reducing manufacturing complexity and defect probability in large display panels.
Solution Approach 2:
A single touch line serves multiple touch electrodes simultaneously, making the touch line multi-functional. This universal connection approach reduces the overall count of touch channels needed, directly addressing the production yield issue in enlarged display panels.
2Area of stationary object
If display panels are enlarged in size, then the display area increases, but the number of touch electrodes and touch lines increases leading to high manufacturing cost
Solution Approach 1:
Multiple touch electrodes share a common touch line connection, merging what would otherwise require separate manufacturing processes into a single integrated structure. This reduces manufacturing cost by simplifying the fabrication process and reducing material usage in large display panels.
Solution Approach 2:
The touch line is designed to serve multiple electrodes universally, reducing the total component count and associated manufacturing costs for enlarged display panels.
3Device complexity
If touch electrodes are connected in a multi-connection type, then the number of touch channels decreases, but the ghost phenomenon may occur where untouched points are abnormally recognized as touch positions
Solution Approach 1:
The touch sensing process is segmented into sequential time intervals, with each touch electrode being sensed in a specific time slot. This temporal segmentation allows the system to distinguish between actual touches and ghost phenomena by identifying which electrode should be active at each moment.
Solution Approach 2:
Touch sensing is performed periodically in a time-division sequence, cycling through different touch electrodes in predetermined time slots. This periodic sensing approach enables the system to detect and eliminate false touch signals by comparing expected versus actual sensing results across multiple cycles.
4Reliability
If touch blocks are driven sequentially using time-division method, then ghost touches are prevented, but the sensing process requires time coordination
Solution Approach 1:
The sensing sequence and time slots are predetermined and pre-coordinated before actual touch sensing begins. This preliminary setup eliminates the need for real-time decision-making during sensing, reducing time coordination overhead while maintaining reliable ghost touch prevention.
Solution Approach 2:
The time-division sensing operates on a fixed periodic schedule with predetermined time slots for each electrode. This regular periodicity optimizes time utilization by eliminating variable delays and synchronization overhead, achieving efficient ghost touch prevention with minimal time loss.
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
Reduces the number of touch channels and effectively prevents or minimizes the occurrence of ghost touches, improving production yield and reducing manufacturing costs while maintaining accurate touch sensing.
Implementation Method 1
a first touch block including a plurality of first RX electrodes and a first TX electrode pattern dividing the plurality of first RX electrodes, a second touch block including a plurality of second RX electrodes and a second TX electrode pattern dividing the plurality of second RX electrodes
Data Source
AI summary
A touch sensing display apparatus includes a first touch block including a plurality of first RX electrodes and a first TX electrode pattern dividing the plurality of first RX electrodes, a second touch block including a plurality of second RX electrodes and a second TX electrode pattern dividing the plurality of second RX electrodes, a TX driving circuit connected to the first TX electrode pattern through a first TX driving line and connected to the second TX electrode pattern through a second TX driving line, and an RX sensing circuit connected to the first RX electrodes and the second RX electrodes through a plurality of RX sensing lines, wherein each of the plurality of RX sensing lines is connected to one of the plurality of first RX electrodes and one of the plurality of second RX electrodes in common.