A method for eliminating noise of capacitive touch screen and capacitive touch screen

A capacitive touch screen and noise technology, applied in electrical digital data processing, data processing input/output process, instruments, etc., can solve problems such as poor stability and control performance of capacitive touch screen, save system resource overhead, improve Detection accuracy, effect of eliminating common mode voltage transient noise

Active Publication Date: 2017-07-28
MILKYWAYSILICON TECH
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Problems solved by technology

[0004] In view of the above deficiencies in the prior art, the object of the present invention is to provide a method for eliminating noise on a capacitive touch screen and a capacitive touch screen, aiming at solving the problems of poor stability and controllability of the existing capacitive touch screen

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  • A method for eliminating noise of capacitive touch screen and capacitive touch screen
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  • A method for eliminating noise of capacitive touch screen and capacitive touch screen

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Embodiment Construction

[0027] The present invention provides a method for eliminating noise on a capacitive touch screen and a capacitive touch screen. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] see figure 1 , figure 1 It is a flow chart of a preferred embodiment of the method for eliminating capacitive touch screen noise of the present invention, as shown in the figure, which includes steps:

[0029] S101. Acquire in advance the noise ratio R of the noise of the first scan line and the noise of the second scan line on the capacitive touch screen, the first scan line is adjacent to the second scan line;

[0030] S102. Use a signal sampling circuit to measure the total signal of the first scan line, and use a nois...

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Abstract

The invention discloses a method for eliminating noise on a capacitive touch screen and the capacitive touch screen, wherein the method includes the step of: obtaining in advance the noise ratio R of the noise of the first scanning line and the noise of the second scanning line on the capacitive touch screen, so that The first scanning line is adjacent to the second scanning line; the total signal of the first scanning line is measured by a signal sampling circuit, and the noise of the second scanning line is measured by a noise sampling circuit; the noise of the second scanning line is The noise of the first scan line is multiplied by the noise ratio R, and the noise of the first scan line is subtracted from the total signal of the first scan line to obtain a signal of the first scan line after the noise is removed. The present invention effectively eliminates the transient noise of the common mode voltage of the LCD itself, the fluctuation noise of the power supply, and the radiation noise of the environment, saves system resource overhead, improves the yield of products, and improves the accuracy of finger track detection of the capacitive touch screen. Spend.

Description

technical field [0001] The invention relates to the field of capacitive touch screens, in particular to a method for eliminating noise on the capacitive touch screen and the capacitive touch screen. Background technique [0002] In the capacitive touch screen sensing system, there are mainly two kinds of electronic signal noise interference effects, referred to as noise: the first is Electro Magnetic Interference (EMI for short), which mainly comes from the peripheral electronics on the capacitive touch screen. The interference of the device to the sensor; the second type of noise interference is brought when the finger approaches or touches the capacitive touch screen. Noise interference seriously affects the stability and control performance of the touch screen sensing system. Therefore, for designers of capacitive touch screen systems, how to establish a stable, effective and reliable touch system in an actual application environment is a challenge. [0003] Therefore, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044
Inventor 钟尚书刘彦甫李湘村
Owner MILKYWAYSILICON TECH
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