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Touch sensing device and scanning method thereof

A technology of touch sensing and scanning method, which is applied in the fields of instruments, computing, electrical digital data processing, etc., can solve the problems of increased scanning and sensing time, reduced sensing efficiency, and non-compliance with requirements, and achieves simple modification and reduced scanning. Sensing time and the effect of improving overall sensing performance

Active Publication Date: 2012-09-26
TRENDON TOUCH TECHNOLOGY CORPORATION
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AI Technical Summary

Problems solved by technology

[0006] However, according to the current design technology, only the equivalent capacitance of one coupling point is scanned and sensed sequentially at a time.
However, when the size of the capacitive touch panel becomes larger or the requirement for touch accuracy becomes higher and higher, the number of driving signal lines and sensing signal lines increases, resulting in more and more coupling points formed by intersections. The scanning and sensing time of the entire capacitive touch sensing device will be greatly increased, resulting in a decrease in sensing performance, which does not meet the application requirements

Method used

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  • Touch sensing device and scanning method thereof
  • Touch sensing device and scanning method thereof
  • Touch sensing device and scanning method thereof

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Embodiment Construction

[0029] The touch sensing device provided by the present invention divides the scanning process into two phases, and first scans a line sequentially to determine whether the capacitance value of at least one column (row) in the electrode array changes. Afterwards, a detailed scan is performed only for the column (row) where the capacitance value changes are detected, so as to accurately determine the capacitance value change of at least one coupling point in the column (row) whose capacitance value changes . In this way, the present invention can provide relevant potential information for determining the position coordinates of the actual touch point.

[0030] Please refer to figure 2 , is a circuit block diagram of an embodiment of the capacitive touch sensing device of the present invention. As shown in the figure, the capacitive touch sensing device 1 of this embodiment includes: an electrode array 10, a first switching unit 11, a second switching unit 12, a sensing circu...

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Abstract

The present invention provides a capacitive touch sensing device and a scanning method thereof. The present invention divides a scanning procedure of an electrode matrix into two stages. First, it scans broadly for determining whether the potential signal of at least one driving line of the electrode matrix is changed or not. After that, the present invention is only directed to the driving line which the potential signal is changed to scan in detail, to determine whether the potential signal of each coupling node on the driving line is changed or not. Therefore, the present invention can achieve the purpose of improving sensing efficiency of the capacitive touch sensing device.

Description

technical field [0001] The present invention relates to a touch sensing device, in particular to a capacitive touch sensing device and a scanning method thereof. Background technique [0002] In recent years, touch sensing devices using capacitive technology have been widely used in various electronic products. In this way, the user can input information by means of multi-touch input. [0003] Please refer to figure 1 , is a schematic circuit block diagram of a conventional capacitive touch sensing device. As shown in the figure, the capacitive touch sensing device 9 includes: an electrode array 90, a first multiplexer 91, a drive circuit 92, a second multiplexer 93, an integrator 94 and an analog / digital Converter 95. Wherein, the electrode array 90 includes a plurality of driving signal lines L D and a plurality of sensing signal lines L S , and each drive signal line L D with each sense signal line L S It is a cross to form a coupling point (Coupling Node) 901, an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
CPCG06F3/0416G06F3/044G06F3/0445G06F3/0446G06F3/041661G06F2203/04111
Inventor 張慶陽
Owner TRENDON TOUCH TECHNOLOGY CORPORATION
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