Touch Sensing Device Block-Point Scanning for Fast Detection
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Solution Overview
Problem
Current multi-point touch sensing systems for touch screens face challenges in achieving fast response times due to the time-consuming process of obtaining and comparing capacitance values to determine touch points, which hinders efficient touch event detection.
Innovation Solution
A position detection method and sensing device utilizing a 2-D array of sensing blocks, where block-scanning and point-scanning operations are performed to quickly identify touched points by activating and detecting all sensing points simultaneously within blocks and areas, reducing detection time through threshold-based capacitance comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional point-by-point capacitance detection is used to ensure accurate touch point identification, then measurement precision is improved, but detection time increases significantly
Solution Approach 1:
The sensing area is divided into multiple sensing blocks arranged in a grid pattern. Each sensing block contains multiple sensing points. The controller performs block scanning first to identify which blocks contain touch points, then performs point scanning only within those identified blocks. This segmentation approach reduces the total number of detection operations from scanning all points in the entire sensing area to scanning only the relevant subset of points within touched blocks, thereby significantly reducing detection time while maintaining accurate touch point identification.
2Measurement precision
If all sensing points are scanned individually to identify touch points, then measurement precision is improved, but productivity decreases due to slow response
Solution Approach 1:
The sensing array is segmented into multiple sensing blocks, allowing the controller to first perform a coarse-grained block scanning operation to identify regions of interest. Only after a block is identified as touched does the controller perform fine-grained point scanning within that specific block. This two-stage segmentation strategy enables rapid identification of touch regions while maintaining precise touch point detection, thereby improving overall response speed without sacrificing measurement accuracy.
Solution Approach 2:
The block scanning operation serves as a preliminary action that identifies which sensing blocks contain touch points before the more time-consuming point scanning operation is performed. By performing this preliminary block-level detection first, the system avoids unnecessarily scanning all sensing points in the entire sensing area, thus accelerating the overall detection process while ensuring that point scanning is only performed where actually needed.
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 approach significantly reduces the time required to detect touch points, enhancing detection speed and sensitivity while maintaining high accuracy, thus improving the responsiveness of multi-touch sensing systems.
Implementation Method 1
This type of system relies on self-capacitance and/or mutual capacitance sensing methods to determine if the touch screen has being touched by the user. During the sensing period, when the controller of the sensing system has detected a change in capacitance for a particular location, the location is deemed to have been touched by the user.
Data Source
AI summary
A method for position detection is adapted to a sensing device. The sensing device includes a plurality of sensing blocks arranged in a 2D array, with each block having a plurality of sensing points arranged in a 2D array. The method includes conducting a block-scan to determine if a touched block exists, and conducting a point-scan to obtain a touched point if the touched block exists. In order to obtain a touched point, the sensing device applying the method conducts a block-scan within the sensing area and then a point-scan within the touched block instead of point-scanning the whole sensing area. Accordingly, the sensing device could obtain the touched point faster than before.