Reading device for current type touch panel

A technology of touch panel and reading device, which is applied to conversion equipment without intermediate conversion to AC, adjustment of electrical variables, electrical digital data processing, etc., to achieve the effect of reducing chip area

Inactive Publication Date: 2011-04-20
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the integrator is used to read the touch panel 110, if the sensing current Is is too large, the output of the integrator may reach saturation.

Method used

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  • Reading device for current type touch panel
  • Reading device for current type touch panel
  • Reading device for current type touch panel

Examples

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Embodiment Construction

[0041] The following embodiments will take a photo current type touch panel (photo current type touch panel) 110 as an example to illustrate the application of the reading device of the present invention. However, the scope of application of the present invention should not be limited thereto. Any amperometric touch panel can be applied according to the teaching of this specification.

[0042] figure 2 It is a schematic circuit diagram illustrating a reading device for a current type touch panel according to an embodiment of the present invention. The reading device 200 includes a current-to-voltage conversion unit 210 , a voltage gain unit 220 and an analog-to-digital converter 230 . The current-to-voltage conversion unit 210 converts the sensing current Is of the current mode touch panel 110 into a sensing voltage Vs. The input terminal of the voltage gain unit 220 is coupled to the output terminal of the current-to-voltage conversion unit 210 to receive the sensing volt...

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Abstract

The invention discloses a reading device for a current type touch panel. The reading device comprises a current-to-voltage conversion unit, a voltage gain unit and an analog-digital converter, wherein the current-to-voltage conversion unit converts the sensing current of the current type touch panel into sensing voltage; an input end of the voltage gain unit is coupled to an output end of the current-to-voltage conversion unit so as to receive the sensing voltage; and an input end of the analog-digital converter is coupled to an output end of the voltage gain unit, and an output end of the analog-digital converter generates digital codes.

Description

technical field [0001] The present invention relates to a touch device, in particular to a reading device for an amperometric touch panel. Background technique [0002] With the vigorous development of electronic technology and the popularization of wireless communication and network, various electronic devices have gradually become an indispensable tool in life. However, commonly used input / output (I / O) interfaces, such as a keyboard or a mouse, are quite difficult to operate. In contrast, a touch panel is an intuitive and simple input and output interface. Therefore, the touch panel is often used as a man-machine interface between people and electronic devices to perform control. [0003] In general, touch panels can be classified into resistive touch panels, optical touch panels, capacitive touch panels, and the like. According to the readout method, it can be divided into current type touch panel (current type touch panel) and charge type touch panel (charge type touc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041G05F3/26H03F3/42H02M3/04
Inventor 庄凯岚李国铭陈英烈
Owner HIMAX TECH LTD
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