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Capacitive-type touch sensing device and detection method 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, etc., and can solve problems such as inability to detect voltage values ​​and increase manufacturing complexity

Inactive Publication Date: 2014-08-06
PIXART IMAGING INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the opening period of the detection switch 941 must be calibrated for different panels, otherwise the correct voltage value cannot be detected, and this calibration step increases the manufacturing complexity

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  • Capacitive-type touch sensing device and detection method thereof
  • Capacitive-type touch sensing device and detection method thereof
  • Capacitive-type touch sensing device and detection method thereof

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Embodiment Construction

[0035] In order to make the above and other objects, features, and advantages of the present invention more apparent, a detailed description will be given below with reference to the accompanying drawings. In the description of the present invention, the same components are denoted by the same symbols, and will be described in advance here.

[0036] Please refer to figure 2 , which shows a schematic diagram of a capacitive touch sensing device according to an embodiment of the present invention. The capacitive touch sensing device of this embodiment includes a sensing unit 10 , a driving unit 12 , a detection circuit 13 and a processing unit 14 . The capacitive touch sensing device detects whether an object (such as, but not limited to, a finger or a metal piece) is approaching the sensing unit 10 by judging the charge change of the sensing unit 10 .

[0037] The sensing unit 10 includes a first electrode 101 (such as a driving electrode) and a second electrode 102 (such as...

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Abstract

A capacitive-type touch sensing device comprises a sensing unit, a driving unit, a detection circuit and a processing unit. The sensing unit comprises a first electrode and a second electrode which are used for forming a coupling capacitor, the driving unit inputs a driving signal to the sensing unit, the detection circuit is used for detecting a detection signal formed by the driving signal coupled by the coupling capacitor and utilizing two signals to respectively modulate the detection signal so as to generate a two-dimensional detection vector, and the processing unit judges a touch event according to the two-dimensional detection vector.

Description

technical field [0001] The present invention relates to a touch control system, in particular to an active capacitive touch sensing device. Background technique [0002] A capacitive sensor usually includes a pair of electrodes for sensing a finger. When a finger exists, the amount of charge transfer between the pair of electrodes will change, so the presence or absence of the finger can be detected according to the voltage change. A sensing array can be formed by arranging multiple electrode pairs in an array. [0003] Figure 1A with Figure 1B A schematic diagram of a known capacitive sensor is shown, which includes a first electrode 91 , a second electrode 92 , a driving circuit 93 and a detection circuit 94 . The drive circuit 93 is used to input a drive signal to the first electrode 91, an electric field will be generated between the first electrode 91 and the second electrode 92 to transfer charges to the second electrode 92, and the detection The circuit 94 can d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 许恩峰肯·克兰德尔陈信嘉高铭璨
Owner PIXART IMAGING INC