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Touch sensing circuit and method

A technology of touch sensing and circuit, applied in the direction of electrical digital data processing, instrumentation, input/output process of data processing, etc., can solve the problem that the change of parasitic capacitance cannot be determined

Inactive Publication Date: 2013-07-17
RAYDIUM SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the touch sensing circuit cannot determine whether the above-mentioned parasitic capacitance change is generated by the two touch points located at point A and point B, or by the two touch points located at point A' and point B'

Method used

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  • Touch sensing circuit and method

Examples

Experimental program
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Embodiment Construction

[0030] The invention provides a touch sensing circuit. The touch sensing circuit can be used in the capacitive touch panel to sense the position where the pointing unit touches the capacitive touch panel.

[0031] see Figure 3A , Figure 3A A schematic diagram of the touch sensing circuit 3 and the capacitive touch panel 30 according to a specific embodiment of the present invention is shown. like Figure 3A As shown, the capacitive touch panel 30 includes (6×6) touch points 300, six groups of first touch pad groups Y 1 ~Y 6 and six sets of second touch pad set X 1 ~X 6 . It should be noted that the number of touch pad groups and touch points included in the capacitive touch panel is not limited to this example, but depends on actual application requirements. Next, the structures of the capacitive touch panel 30 and the touch sensing circuit 3 will be introduced respectively.

[0032] First, in the capacitive touch panel 30, the first touch pad group Y 1 ~Y 6 are a...

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PUM

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Abstract

The invention discloses a touch sensing circuit which is used for a capacitive touch panel for detecting the position of the capacitive touch panel touched by an indication unit. The touch sensing circuit comprises a first signal input module, a second signal input module, a first sensing module, a second sensing module and a processing module (processing unit), wherein the first signal input module successively inputs signals to a first touch pad set arranged along the first direction, and a second signal input module inputs signals to a second touch pad set arranged along the second direction; and the first sensing module and the second sensing module are respectively used for sensing the first equivalent capacitance of the first touch pad set and the second equivalent capacitance of the second touch pad set. The processing unit is connected with the first sensing module and the second sensing module for judging the position of the indication unit according to the first equivalent capacitance and the second equivalent capacitance.

Description

technical field [0001] The present invention relates to a touch panel, in particular to a touch sensing circuit and a touch sensing method capable of truly realizing multi-touch on a capacitive touch panel by sensing equivalent capacitance values. Background technique [0002] Generally speaking, touch panels can be roughly classified into resistive, capacitive, ultrasonic, optical (such as infrared) and other types according to different sensing principles. Among them, the capacitive touch panel can be sensed only by a slight touch, and the contact between the finger and the touch panel will hardly cause wear, so the performance is stable and the service life is long. Therefore, compared with the traditional resistive touch panel, the capacitive touch panel does exhibit better performance in terms of durability and optics. [0003] see Figure 1A and Figure 1B . Figure 1A and Figure 1B A timing diagram of a conventional touch sensing circuit 1 and its control signal i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044
Inventor 周世宗吴宗霖
Owner RAYDIUM SEMICON