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Mutual capacitance touch screen and touch sensing method thereof

A technology of touch sensing and touch screen, which is applied in the direction of electrical digital data processing, instrumentation, data processing input/output process, etc. It can solve the problems of long scanning time for larger touch objects, insensitive system response, waste of system resources, etc., to achieve Reduce the overall scanning time, good user experience, and save system resources

Active Publication Date: 2013-07-17
FOCALTECH SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a mutual capacitive touch screen, aiming to solve the problem that the existing mutual capacitive touch screen has a long and wasteful scanning time for larger touch objects due to the fixed and small spacing between the receiving electrodes. System resources, which in turn make the system unresponsive and poor user experience

Method used

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  • Mutual capacitance touch screen and touch sensing method thereof
  • Mutual capacitance touch screen and touch sensing method thereof
  • Mutual capacitance touch screen and touch sensing method thereof

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Embodiment 1

[0031] Embodiment 1 of the present invention proposes a mutual capacitive touch screen, such as figure 2 As shown, it includes a plurality of driving electrodes T1 to Tn arranged at intervals, and a plurality of receiving electrodes R1 to Rm arranged at intervals, and the plurality of driving electrodes vertically intersect with the plurality of receiving electrodes. Different from the prior art, the mutual capacitive touch screen also includes: a plurality of first switches 11, and the plurality of first switches 11 are connected in series on the lead-out lines of each receiving electrode in one-to-one correspondence; a plurality of second switches 12 , a plurality of second switches 12 are respectively connected one by one between the leading ends of each adjacent receiving electrode; the control unit (not shown in the figure), the control unit is connected to the leading end of each receiving electrode, the first switch 11 And the second switch 12 is used to identify the t...

Embodiment 2

[0035] Embodiment 2 of the present invention proposes a touch sensing method for a mutual capacitive touch screen as described in Embodiment 1 above, as image 3 shown, including:

[0036] Step S1: The control unit identifies the type of the touching object, and controls the closing or opening of the corresponding first switch 11 and second switch 12 according to the identification result, so as to dynamically adjust the sensing channel width and spacing of each receiving electrode.

[0037] In one case, such as Figure 4 As shown, step S1 may include:

[0038] Step S101: the control unit detects a touch action of the touch object according to the current signal of the receiving electrode.

[0039] Step S102: The control unit identifies the type of the touch object, which is classified according to the size of the contact area when the touch object touches the touch screen. If the touch object is a finger, perform step S103. If the touch object is a finger and a touch pen, o...

Embodiment 3

[0066] Embodiment 3 of the present invention proposes a thin film field effect transistor liquid crystal display, the thin film field effect transistor liquid crystal display is a thin film field effect transistor liquid crystal display based on In-Plane Switching (IPS) technology, and its electrode arrangement principle is as follows Figure 9 As shown, the electrode stacking principle is as follows Figure 10 shown.

[0067] In detail, such as Figure 9 As shown, the thin film field effect transistor liquid crystal display includes: a common electrode 22 in the X direction; a signal electrode 21 and a common electrode 23 in the Y direction which intersect with the common electrode 22 in the X direction and are vertically arranged respectively, and the signal electrode 21 and the common electrode in the Y direction 23 do not intersect each other; the switch electrodes 24 that intersect with the signal electrodes 21 and the common electrodes 23 in the Y direction and are vert...

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Abstract

The invention belongs to the technical field of touch screens, and provides a mutual capacitance touch screen and a touch sensing method thereof. Firstly, a control unit is used for identifying the types of touch objects; and secondly, the control unit is used for controlling on and off of a corresponding first switch and a corresponding second switch, the widths and the spacing of sensing passages of receiving electrodes are dynamically adjusted, the widths and the spacing of the sensing passages can be increased for large touch objects such as a finger and can be decreased for small touch objects such as a touch pen, accordingly, input of various touch objects can be accurately detected, the number of the sensing passages can be reduced when the touch objects are large, overall scanning time is shortened, system resources are saved, reporting speed is increased, system response is further more sensitive, and user experience is excellent.

Description

technical field [0001] The invention belongs to the technical field of touch screens, in particular to a mutual capacitive touch screen and a touch sensing method thereof. Background technique [0002] With the development of technology, people pay more and more attention to handwriting input technology. At present, mutual capacitive touch screens are generally used in electronic terminals to realize touch sensing of handwriting input. [0003] The mutual capacitive touch screen includes driving electrodes and receiving electrodes. The driving electrodes are used to send low-voltage high-frequency signals and project them to the receiving electrodes to form a stable current. When the human body or touch pen touches the touch screen, an equivalent capacitance will be formed between the fingertip or the pen tip and the touch screen, and the high-frequency signal can enter the ground through the equivalent capacitance, and the amount of charge received by the receiving electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 李华王朋王李冬子
Owner FOCALTECH SYST LTD
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