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Capacitance type touch control device and sensing device thereof

A technology of capacitive touch and sensing devices, which is applied in the direction of electrical digital data processing, instruments, and input/output processes of data processing, and can solve problems such as increasing circuit costs

Inactive Publication Date: 2011-09-28
HOLTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this approach increases the cost of the circuit

Method used

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  • Capacitance type touch control device and sensing device thereof
  • Capacitance type touch control device and sensing device thereof
  • Capacitance type touch control device and sensing device thereof

Examples

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Embodiment Construction

[0050] First please refer to figure 2 , figure 2It is a schematic diagram illustrating a sensing device 200 according to an embodiment of the present invention. The sensing device 200 is used for detecting the capacitance change of a sensing capacitor Cp on the capacitive touch panel TPAD. The sensing device 200 includes a reference capacitance module 210 , a switch module 220 , an integration circuit 230 and a control circuit 240 . The switch module 220 is coupled to the reference capacitor module 210 and the sensing capacitor Cp. The integrating circuit 230 has first and second input terminals TI1 and TI2 , the first input terminal TI1 is coupled to the common coupling point TC between the reference capacitor module 210 and the sensing capacitor Cp, and the second input terminal TI2 receives the adjustment voltage Vcm1 . The control circuit 240 is coupled to the integration circuit 230 and the reference capacitor module 210 and provides the adjustment voltage Vcm1 to th...

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Abstract

The invention relates to a capacitance type touch control device and a sensing device thereof. The sensing device comprises a reference capacitance module, a switching module, an integrating circuit, and a control circuit, wherein the switching module is used for receiving control signals, a first reference voltage and a second reference voltage and enabling the reference capacitance module and acapacitance type touch pad to be respectively coupled with the first reference voltage and the second reference voltage according to the control signals, or enabling the reference capacitance module to be coupled to a sensing capacitor on the capacitance type touch pad. The integrating circuit is used for receiving a regulation voltage and carrying out integration on the charge difference of electric charge quantity stored by the reference capacitance module and the sensing capacitor so as to obtain integral results. When the capacitance type touch pad of the control circuit is not touched, the regulation voltage is regulated according to a voltage regulation signal generated by the integral result. According to the capacitance type touch control device and the sensing device thereof, equivalent capacitance errors generated by circuit components and wiring in the touch control device do not need to be taken into account, and therefore capacitance changes on the capacitance type touch pad can be accurately detected.

Description

technical field [0001] The present invention relates to a capacitive touch device, and in particular to a sensing device for capacitance change of the capacitive touch device. Background technique [0002] Today, with the increasing popularity of consumer electronic products, in order to provide a more humanized human-machine interface, touch panels have become a necessary equipment for various electronic products. In today's technical field, touch panels can be broadly classified into capacitive touch panels and resistive touch panels. [0003] The capacitive touch panel detects the touch point mainly based on the capacitance change generated when the touch panel is touched by the user. Wherein, a so-called charge transfer capacitance measurement circuit is often applied to detect the touch point of the capacitive touch panel. Please refer to figure 1 , figure 1 A sensing device 100 of a known capacitive touch device is shown. In the operation of the sensing device 100...

Claims

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Application Information

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IPC IPC(8): G06F3/044
Inventor 陈议诚
Owner HOLTEK SEMICON
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