Multi-finger detection method of capacitive touch screen

A technology of capacitive touch screen and touch screen, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve problems such as misoperation, achieve detection speed improvement, overcome ghost point interference, and simple method Effect

Inactive Publication Date: 2011-05-25
SUZHOU PIXCIR MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method used in this patent successfully detects multi-finger touch, in the above method, if the noise interference exceeds the maximum threshold

Method used

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  • Multi-finger detection method of capacitive touch screen
  • Multi-finger detection method of capacitive touch screen
  • Multi-finger detection method of capacitive touch screen

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0011] Please refer to figure 1 As shown, the capacitive touch screen 1 of the present invention includes an outer frame 11, a base plate 12 and several sensing blocks 13 arranged thereon, and several scanning lines on the touch screen 1 include the outer frame 11 of the touch screen as scanning lines and the base plate 12 As the scanning line and the sensing block 13 as the scanning line. Determine the coordinate system on the touch screen 1, take the lower left corner of the touch screen 1 as the origin, and determine the number of rows and columns along the X and Y axes, such as the rows in the X direction are 1, 2, 3... , the columns in the Y direction are 1, 2, 3.... The number of sensing blocks 13 on the touch screen 1 is determined by the number of scanning lines.

[0012] The touch screen 1 starts to scan after being powered on. Since the tou...

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PUM

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Abstract

The invention relates to a multi-finger detection method of a capacitive touch screen, wherein the touch screen comprises a plurality of scanning lines, and the method comprises the following steps of: firstly, dividing the touch screen into a plurality of induction blocks; secondly, starting a scanning process to find out a plurality of induction blocks having larger differential capacitance; and finally, determining inside specific position of the larger induction block according to the differential capacitance of surrounding induction blocks of the larger induction block. With the multi-finger detection method of the capacitive touch screen, the touch screen is divided into a plurality of regions, when the differential capacitance of a region touched by the finger is higher than a predetermined threshold, a induction block region touched by the finger can be determined, so that interference of ghost points is avoided.

Description

technical field [0001] The invention relates to a multi-finger detection method, in particular to a multi-finger detection method on a capacitive touch screen. Background technique [0002] With the development trend of the current multimedia system, there are more and more functions, and the relative operation interface is also more and more complicated. However, more functions mean that more related button operations need to be set on the device, but in Under the requirements of smaller and more delicate systems, it is impossible to add all these buttons to the system. Therefore, today's developers use touchpad technology to save the space required for most operation buttons. [0003] The so-called touchpad refers to an input device that can be used by the user to directly touch and slide on the panel or use gestures instead of buttons to control the movement of the cursor on the display screen by using fingers or other objects (such as a stylus). The touch panel has the ...

Claims

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Application Information

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IPC IPC(8): G06F3/044
Inventor 尹建涛
Owner SUZHOU PIXCIR MICROELECTRONICS
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