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Capacitive touch device and excitation signal generating circuit and method thereof

A technology of capacitive touch and stimulation signals, which is applied in the fields of electrical digital data processing, instruments, calculations, etc., and can solve the problems of sensing signal distortion, power consumption, high cost, etc.

Inactive Publication Date: 2016-05-11
ELAN MICROELECTRONICS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned technical defects, the main purpose of the present invention is to provide a stimulation signal generation circuit and method with a simple circuit structure, and a capacitive touch device using the stimulation signal generation circuit to solve the problem of stimulation signals passing through different current transmission paths. Sensing signal distortion, power consumption, high cost and other problems generated by the touch panel sensing line

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  • Capacitive touch device and excitation signal generating circuit and method thereof
  • Capacitive touch device and excitation signal generating circuit and method thereof
  • Capacitive touch device and excitation signal generating circuit and method thereof

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Embodiment Construction

[0057] The present invention mainly improves the stimulating signal generating circuit of the capacitive touch device to simplify the stimulating signal generating circuit. The technical means adopted by the present invention to achieve the intended purpose are further described below in conjunction with the accompanying drawings and preferred embodiments of the present invention.

[0058] See first Figure 1A As shown, it is the first preferred embodiment of the capacitive touch device of the present invention, which includes a touch panel 10 , a stimulation signal generating circuit and a receiving circuit 30 .

[0059] The above-mentioned touch panel 10 includes a plurality of sensing lines 11; preferably, the plurality of sensing lines 11 include first-axis sensing lines and second-axis sensing lines interlaced with each other. In this embodiment, mutual capacitance scanning is taken as an example, so the first axis sensing lines TX1~TXn are used as driving lines, and the...

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Abstract

The present invention is related to a capacitive touch device and excitation signal generating circuit and method thereof. The excitation signal generating circuit is connected to multiple sensing traces of the capacitive touch device, and has a storage unit storing at least one set of digital data. Each set of digital data is corresponding to a frequency. The PDM signal generator reads the set of digital data and converts the read set of digital data to a PDM signal according to the frequency of the read set of digital data. The PDM signal is recovered to an analog excitation signal since the PDM signal passes through a current transmission path, which is equivalent to a low pass filter. Therefore, the present invention can decrease a distortion of the sensing signal to increase accuracy of the sensing signal and to save power.

Description

technical field [0001] The present invention relates to a capacitive touch device, in particular to a stimulation signal generating circuit of the capacitive touch device. Background technique [0002] The capacitive touch device includes a touch panel and a scanning circuit, wherein the touch panel includes a plurality of sensing lines, and the scanning circuit sequentially inputs a stimulus signal to all or part of the sensing lines, due to the capacitive effect Therefore, the stimulation signal generates a charging current on the sensing line. After a charging time, the current of the sensing line tends to be stable. At this time, read the discharge current of the sensing line, or read the current of the sensing line The coupling current on the sensing lines with interlaced lines is used to convert the correct capacitive sensing value, and then the position of the touch object on the touch panel is identified according to the change of the capacitive sensing value. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
CPCG06F3/04166G06F3/0446G06F3/044
Inventor 林嘉兴陈翰纬陈俊宇
Owner ELAN MICROELECTRONICS CORPORATION