Method for preventing conductive liquid from causing misoperation of touch screen
A conductive liquid and touch screen technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve the problems of misjudgment as water drop trigger, complicated detection process, complicated detection steps, etc., to improve accuracy , the steps are simple, and the effect of preventing misoperation
Inactive Publication Date: 2013-09-25
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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Problems solved by technology
The detection steps of this method are complicated, and it is necessary to determine whether it is a false trigger by water droplets through the number of trigger points, the number of triggers, and the coordinates of the trigger points.
The detection process of this method is relatively complicated, and if the finger presses the touch screen for a long time, it is easy to be misjudged as a water drop trigger.
Method used
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Embodiment
[0029] like figure 2 As shown, this embodiment discloses a method for preventing misoperation of the touch screen caused by conductive liquid, including the following steps:
[0030] (1) Obtain the change value ΔC of the current touch screen capacitance;
[0031] (2) Determine whether the current change value ΔC of the capacitance of the touch screen is within the range of the touch screen capacitance caused by the liquid; the change range of the touch screen capacitance caused by the liquid is 40 to 60;
[0032] If yes, it means that there is conductive liquid on the touch screen, judge the area of conductive liquid on the touch screen, and then go to step (3);
[0033] If not, it means that there is no conductive liquid on the touch screen;
[0034] (3) Detect whether a touch event is recognized in the area with conductive liquid on the touch screen;
[0035] If yes, go to step (4);
[0036] If not, go to step (5);
[0037] (4) Increase the reference value of the cur...
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The invention discloses a method for preventing conductive liquid from causing misoperation of a touch screen. The method includes the steps: (1) acquiring the capacitance change value delta C of the touch screen; (2) judging whether the current capacitance change value delta C of the touch screen is within the range of capacitance change of the touch screen caused by the conductive liquid or not, indicating that the conductive liquid remains on the touch screen if the current capacitance change value delta C of the touch screen is within the range, entering the step (3), and indicating that no conductive liquid remains on the touch screen if not; (3) detecting whether a touch event is identified on the touch screen or not, entering the step (4) if the touch event is identified on the touch screen and entering the step (5) if not; (4) increasing the current reference value of the touch screen and executing the step (3); (5) starting a timer, reducing the reference value of the touch screen to an initial value after time T, judging whether the touch event is identified on the touch screen or not, indicating that the touch event is performed on the touch screen if the touch event is identified on the touch screen, returning to the step (4), and indicating that the touch event is not performed on the touch screen if not. The method has the advantages of simple steps and high accuracy.
Description
technical field [0001] The invention relates to a touch technology of a touch screen, in particular to a method for preventing misoperation of the touch screen caused by conductive liquid. Background technique [0002] The touch screen is a positioning device that transmits information through thermal induction, and the user can directly input coordinate information to the computer by hand. It is an input device like a mouse and a keyboard, but compared with a keyboard and a mouse, a touch screen provides users with more Better convenience. [0003] In daily use, sometimes there is water on the surface of the touch screen, for example, water is spilled on the surface of the touch screen or the touch screen is tapped with a wet finger. Since liquid is also a capacitive substance, it will also cause changes in the surface capacitance of the touch screen, which is similar to having a finger on the touch screen all the time, which will cause the touch screen to be insensitive. ...
Claims
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IPC IPC(8): G06F3/044
Inventor 张强
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD