Touch Electrode Synchronization for Reliable Finger and Pen Sensing
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Solution Overview
Problem
Electronic devices face challenges in efficiently recognizing touches from both fingers and active pens due to deteriorating sensing performance as displays become larger and faster, leading to reduced reliability in touch and display operations.
Innovation Solution
A touch module with a touch array comprising first and second touch electrode groups, driven by a touch driver that applies synchronized touch driving signals and synchronization signals to improve touch recognition reliability, utilizing orthogonal codes and synchronized signal application across electrode groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If displays become larger and faster, then display performance is improved, but sensing performance for recognizing touch deteriorates
Solution Approach 1:
The touch electrode group is divided into multiple sub-touch electrode groups, with each group assigned a unique orthogonal code. This segmentation allows the system to distinguish between different electrode groups even when signals are transmitted simultaneously, thereby maintaining touch sensing precision despite faster display refresh rates.
Solution Approach 2:
The patent applies orthogonal codes as unique identifiers to different sub-touch electrode groups. By changing the signal parameters (applying different orthogonal codes) to each electrode group, the system can accurately identify which electrode group is being touched, maintaining measurement precision even as display speed increases.
2Speed
If displays become larger and faster, then display performance is improved, but reliability of touch operations decreases
Solution Approach 1:
The system transmits uplink signals from the touch electrodes to an external device, which calculates position information based on these signals. This feedback mechanism allows the system to verify touch detection accuracy and maintain reliable touch operations even at higher display refresh speeds.
Solution Approach 2:
By assigning unique orthogonal codes to different sub-touch electrode groups and transmitting signals with these distinct parameters, the system ensures accurate identification and tracking of touch positions, thereby maintaining operational reliability despite increased display speed.
3Measurement precision
If orthogonal codes are applied to multiple sub-touch electrode groups, then touch recognition accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The touch electrode group is segmented into multiple sub-groups, each with a unique orthogonal code. This segmentation enables parallel signal transmission and simplifies the processing approach by allowing the external device to calculate position information based on the distinct orthogonal codes received from different electrode groups.
Data Source
AI summary
A touch module includes: a touch array including: a first electrode group including touch electrodes extending in a first direction, and located along a second direction crossing the first direction; and a second electrode group including touch electrodes extending in the second direction, and located along the first direction; and a touch driver to output uplink signals through each of the first electrode group and the second electrode group to an external device adjacent to the touch array, the external device to calculate position information based on the uplink signals. The touch driver is to output the uplink signals by applying touch driving signals to some of the touch electrodes of the first touch electrode group, and at least one synchronization signal to others of the touch electrodes of the first touch electrode group, and at least some of the touch driving signals are synchronized with the synchronization signal.