Touch Display Device Grouping Electrodes for Fast Sensing
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Solution Overview
Problem
Existing touch display devices require a long time to sense touch coordinates and determine the presence or absence of touch due to the large number of touch electrodes, and this process is further hindered by interference from display driving, leading to reduced touch sensitivity and increased sensing time.
Innovation Solution
A touch display device and touch sensing circuit that groups multiple touch electrodes into groups, performs differential sensing between these groups, and alternates sensing directions to reduce interference and enhance sensitivity, allowing concurrent display and touch sensing while minimizing voltage fluctuations from display driving electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all touch electrodes are sensed to determine touch coordinates and presence, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The touch electrodes are divided into multiple groups (first touch electrode group and second touch electrode group), allowing the sensing process to be segmented into parallel operations. Each group can be sensed simultaneously through group differential sensing, reducing the total sensing time while maintaining comprehensive coverage of all electrodes.
Solution Approach 2:
Multiple touch electrode groups are merged into a single sensing operation through group differential sensing. By combining the sensing of multiple electrodes into one differential measurement, the patent reduces the number of sequential sensing operations required, thereby decreasing total sensing time while preserving measurement accuracy.
2Productivity
If display and touch sensing are performed concurrently, then productivity is improved, but object-affected harmful factors increase
Solution Approach 1:
The harmful voltage fluctuations from display driving electrodes are extracted and compensated for using dedicated reference electrodes. These reference electrodes are positioned to sense the same interference that affects the touch electrodes, allowing the system to separate and remove the display-induced noise from the touch sensing signal.
Solution Approach 2:
Reference electrodes serve as intermediaries between the display driving electrodes and the touch sensing circuitry. These reference electrodes capture the interference from display driving and transmit this information to the differential sensing circuit, which uses it to cancel out the harmful effects on touch sensing.
3Ease of operation
If reference electrodes are positioned close to display driving electrodes, then ease of operation is improved, but object-generated harmful factors increase
Solution Approach 1:
The differential sensing circuit uses feedback from the reference electrodes to continuously monitor and compensate for voltage fluctuations caused by display driving. By comparing the signals from touch electrodes and reference electrodes, the system dynamically adjusts to cancel out the harmful voltage fluctuations, maintaining accurate touch sensing even during concurrent display operation.
Data Source
AI summary
The present disclosure relates to a touch display device, a touch sensing circuit, and a driving method. Further, the present disclosure relates to a touch display device, a touch sensing circuit, and a driving method, in which multiple touch electrodes are grouped into multiple touch electrode groups, and sensing is concurrently performed for each of the multiple touch electrode groups, so that excellent touch sensitivity and a fast touch sensing speed are allowed.