Touch Sensing Circuit With Parallel ADC and Early Data Transmission
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Solution Overview
Problem
Conventional touch display devices face challenges in maintaining high touch sensitivity and signal-to-noise ratio due to noise generation during touch information detection, and they struggle with quick touch sensing as they need to perform touch sensing simultaneously with image display within a limited time.
Innovation Solution
A touch sensing circuit that includes a touch sensing processor to output driving signals to touch electrodes, perform analog-to-digital conversion of detected signals, and a communication processor to transmit digital sensing values to a touch controller, allowing for parallel execution of analog-to-digital conversion and communication processes, including starting data transmission before the conversion is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If touch sensing is performed sequentially with image display in conventional devices, then the system can maintain stable operation, but the touch sensing speed is reduced and the touch frame rate is limited
Solution Approach 1:
The touch sensing circuit performs analog-to-digital conversion and communication processes in parallel, starting data transmission before the conversion is completely finished. This preliminary action allows the system to prepare for the next touch sensing operation while current data is being processed, thereby reducing the overall touch sensing time and increasing the touch frame rate without compromising stable operation
2Measurement precision
If conventional touch sensing processes are used, then the system can operate within limited time, but noise is generated and the signal-to-noise ratio is lowered
Solution Approach 1:
The touch sensing circuit is divided into separate functional modules: a touch sensing processor dedicated to analog-to-digital conversion and a communication processor dedicated to data transmission. This segmentation allows each module to operate independently and optimally, reducing interference and noise generation while maintaining high signal-to-noise ratio during touch sensing operations
Data Source
AI summary
Embodiments relate to a touch sensing circuit, a touch display device, and a touch sensing method. The touch sensing circuit may comprise a touch sensing process configured to output a touch driving signal during a touch sensing period to at least two touch electrodes, and to convert a touch sensing signal detected through each touch electrode, to which the touch driving signal is applied, during an analog-to-digital conversion period, into a digital sensing value, and a communication processor configured to transmit sensing data including the digital sensing value converted during the analog-to-digital conversion period to a touch controller, wherein the communication processor starts transmission of the sensing data including converted digital sensing values of at least some of touch sensing signals before each of touch sensing signals detected from the at least two touch electrodes are converted into a digital sensing value. The present invention enables quick touch sensing. In addition, noise generated in the touch information detection process can be reduced and the signal-to-noise ratio can be improved so that the touch sensitivity can be improved.