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Touch detection method and touch device

A touch detection and touch device technology, applied in the field of touch detection methods and touch devices, can solve the problems of submerging the measured capacitance signal, interference, etc., achieve the effects of reducing physical parameters, improving linearity, and improving measurement accuracy

Active Publication Date: 2013-01-30
BYD SEMICON CO LTD
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  • Abstract
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Problems solved by technology

Moreover, stray capacitance will change with many factors such as temperature, location, internal and external electric field distribution, etc., which will interfere or even submerge the measured capacitance signal

Method used

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  • Touch detection method and touch device
  • Touch detection method and touch device

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Embodiment Construction

[0033] The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

[0034] The embodiment of the present invention proposes a novel self-capacitance detection method. When the sensing unit is touched, the touch point can divide the sensing unit into two resistances, which can be determined by considering the two resistances while performing self-capacitance detection. The position of the touch point on the sensing unit. like image 3 As shown, it is a schematic diagram of the detection principle of the touch device according to the embodiment of the...

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Abstract

The invention provides a touch detection method and a touch device. The method includes: applying high level signals to a first electrode of one of sensing units, and enabling a second electrode to be grounded so that self-capacitance generated by the sensing unit is charged for the first time when the sensing unit is touched; applying high level signals to the second electrode of the sensing unit, and enabling the first electrode to be grounded so that the self-capacitance is charged for the second time; obtaining a first detection change value between the first charging and the second charging, and discharging the self-capacitance for the first time; applying high level signals to the self-capacitance for the third time; enabling the first electrode and the second electrode of the sensing unit to be grounded so as to discharge the self-capacitance for the second time; obtaining a second detection change value between the third charging and the second discharging; and computing the proportional relation of first resistance between the self-capacitance and the first electrode and second resistance between the self-capacitance and the second electrode, and determining a touch position.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of electronic equipment, in particular to a touch detection method and a touch device. Background technique [0002] At present, the application range of touch screen has rapidly expanded from the small commercial market such as bank automatic teller machines and industrial computers to mobile phones, PDA (personal digital assistant), GPS (global positioning system), PMP (MP3, MP4, etc.), and even tablet computers. and other mass consumer electronics fields. The touch screen has the advantages of simple, convenient and humanized touch operation, so the touch screen is expected to become the best interface for human-computer interaction and has been widely used in portable devices. [0003] Capacitive touch screens are generally divided into two categories: self-capacitance and mutual capacitance. like figure 1 Shown is a structural diagram of a common self-capacitance touch scree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
CPCG06F3/041G06F3/045G06F3/044G06F3/0443G06F3/0448
Inventor 李振刚黄臣杨云
Owner BYD SEMICON CO LTD
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