CN1811680A

CN1811680A - Noise filtering method for touch screen

Info

Publication number: CN1811680A
Application number: CNA2005100330407A
Authority: CN
Inventors: 张政雨
Original assignee: LG Electronics Huizhou Co Ltd
Current assignee: LG Electronics Huizhou Co Ltd
Priority date: 2005-01-26
Filing date: 2005-01-26
Publication date: 2006-08-02

Abstract

Said invention refers to method for filtering noises of touch control screen. It contains finding out mean value after detecting positional information, comparing above-mentioned positional information and mean value, calculating difference, outputting final position message.

Description

The noise filtering method of Touch Screen

[technical field]

The present invention is the invention of the noise filtering method of relevant Touch Screen, particularly, when the user continues to pin point of Touch Screen, make it can improve hardware noise or technology limit that the digital conversion because of touch location-simulated data causes, the invention that the Touch Screen noise filtering method of the mouse point jitter phenomenon on the picture is relevant.

[background technology]

In general, the Touch Screen simple and the most direct mode that to be the people exchange mutually with computer, because of in conjunction with input equipment and display device, need not the input equipment of mouse or keyboard and so on, also can touch the desired part of user on the picture, make it make action, concerning the children or old man that are ignorant of computation, have intuitive and benefit easy to use.

Touch Screen with These characteristics as shown in Figure 1, comprise that following part constitutes: if the user pins touch-screen panel, just the position coordinates of pinning is converted to touch-screen panel 101, the above-mentioned touch-screen panel 101 of driving of simulated data output, simulated data by the touch-screen panel input is converted to numerical data, touch location be converted to coordinate Touch Screen control part 102, obtain the input of position data, the central processor equipment 103 of the mouse point on the moving image from above-mentioned Touch Screen control part 102.

At this moment, above-mentioned Touch Screen control part 102 is taken a sample by the simulated data of touch-screen panel 101 inputs at interval with certain hour, is converted to digital signal.At this moment, touch sampling value as detecting the delay time value that touch-screen panel is imported, if this value is big, just increase of delay time takes place in the touch activity, causes the sensitivity of touch-screen panel to reduce; If this value is little, just minimizing of delay time takes place in the touch activity, causes the sensitivity of touch-screen panel to rise.

But existing Touch Screen is when simulated data-touch location is converted to digital signal, even the user continues to pin a point of Touch Screen, also because of the noise or the technology limit of hardware, has the problem of the mouse point shake on the real screen.That is, even the user continues to pin a point of Touch Screen, the still shake slightly of the simulated data of actual input Touch Screen control part, and the problem that exists the mouse point on the picture also to shake simultaneously thus.

[summary of the invention]

So, the present invention develops for solving above-mentioned existing issue, its purpose is, if provide the user to continue to pin a point of Touch Screen, just make it can improve hardware noise or technology limit that the digital conversion because of touch location-simulated data causes, the Touch Screen noise filtering method of the mouse point jitter phenomenon on the picture.

For realizing this purpose, the present invention comprises the steps the characteristics of constituting: if detect the contact of Touch Screen, after just certain number of times continuous detecting goes out its positional information, obtain the step of mean value, more above-mentioned detected each positional information and mean value, calculate the step of its difference, the difference that aforementioned calculation goes out is only obtained mean value with certain beginning value with interior positional information, with the step of final position information output.

The present invention be for the positional information of improving Touch Screen because of hardware noise or technology limit, detected mistakenly phenomenon, when particularly providing the user to continue to pin point of Touch Screen, the method that also can improve the mouse point jitter phenomenon on the picture is as emphasis.

Promptly, observe the positional information that is input to central processor equipment at the Touch Screen control part, even not moving a point, the user do not continue to pin, the data of big gap take place to exist with mean place information in also improper once in a while property ground, the not mobile touch location of user occurs with this, the phenomenon of mouse point shake also takes place.But the present invention improves such problem, provides to make its method that mouse point jitter phenomenon on picture can not take place as emphasis.

As mentioned above, Touch Screen noise filtering method of the present invention has such effect, promptly, if the user continues to pin a point of Touch Screen, just make it can improve hardware noise or technical limitation that the digital conversion because of touch location-simulated data causes, the mouse point jitter phenomenon on the picture.

[description of drawings]

Fig. 1 is the integration map that the general Touch Screen of expression roughly constitutes.

Fig. 2 is the process flow diagram of expression Touch Screen noise filtering method of the present invention.

Fig. 3 is that above-mentioned Fig. 2 process flow diagram of the high frequency noise method of filtering data is filtered in expression.

[embodiment]

Below with reference to accompanying drawings embodiments of the invention are elaborated.

Fig. 2 is the process flow diagram of expression Touch Screen noise filtering method of the present invention.As shown in the figure, go out the positional information of user's input, obtain its mean value by the certain number of times continuous detecting of Touch Screen control part.

Afterwards, each positional information and the mean value of more above-mentioned detection remove the data that have big gap with mean value, and obtain the mean value of remainder data, and its this value is used as data.

As mentioned above, Touch Screen is with certain hour sample position information at interval, and the average sampled data of its some, uses as the final position information data.But in order to solve because of significantly surpassing the technical limitation such as noise insertion of mean value, the positional information that should be identified as identical value continues the problem of variation, the present invention is before handling the input data, obtain mean value in advance, and exist the data of big gap to be considered as the data that noise causes with mean value, do not use this data, but after removing, only obtain mean value, use as final position information with remainder data.

Below with reference to the concrete action of the present invention of the flowchart text of Fig. 2.

The present invention is obtain 16 sub-sampling data average, uses as the final position information data.That is, count 16 times sampled data, after being initialized as 1, reach till 16, detect the positional information (X, Y data) that touches input, be stored in arrangement up to parameter i for the parameter i that is stored in arrangement 1.

If all detect above-mentioned 16 times sampled data, just obtain its mean value, and compare mean value and each positional information that is stored in above-mentioned arrangement 1.Promptly, after detecting each sampled data that stores for 16 times and deducting mean value, judge whether its difference surpasses certain beginning value, if surpass the beginning value, just remove, and only to its difference belong to the beginning value with interior positional information be stored in again arrange 2 after, obtain the mean value that is stored in its array data, this mean value is used as final position information.

At this moment, relatively be stored in the value and the mean value of above-mentioned arrangement 1, be stored in arrangement 2 with interior value, use new parameter j for its difference being belonged to certain beginning value.

But said method is comparatively wide beginning to be set during the value scope, if comprise high frequency noise, beginning value scope with interior also take place and mean value between big gap, so the present invention also moves filter process as shown in Figure 3, and it can be abated the noise.

At above-mentioned Fig. 2, obtain 3 mean values finally obtaining continuously, be stored in X1 (positional information of having exported), X2 (needing the positional information of output now), X3 (positional information that the next one will be exported) respectively, but because of this mean value is the value that detects in the very short time (about 3ms), under the state of pinning same point, second data can not be bigger or little than first and the 3rd data.So if in above-mentioned three mean values (X1, X2, X3), second value X2 is maximum or minimum value, just this second value replaced with the mean value of first value X1 and the 3rd value X3, is provided with.

That is, determine second value, send central control equipment to as final position information with the mean value of maximal value and minimum value.Certainly, at this moment, export present positional information X2, have delaying of a little because of under the state that detects the positional information X3 that the next one will export at needs.But the mistiming of each mean value is the comparatively short time (about 3ms), so almost imperceptible its gap of user.

As mentioned above, the present invention eliminates the positional information that significantly surpasses mean value, using as mean value with interior value to certain beginning value from mean value, uses with positional information, therefore when continuing to pin same of Touch Screen, make it that phenomenon that mouse point is shaken can not take place.

Claims

1, Touch Screen noise filtering method comprises:

If detect the contact of Touch Screen, after just certain number of times continuous detecting goes out its positional information, obtain the step of its mean value;

More above-mentioned detected each positional information and mean value calculate the step of its difference;

The difference that aforementioned calculation goes out is only obtained mean value with certain beginning value with interior positional information, with the step of final position information output.

2, as claim item 1 described Touch Screen noise filtering method, it is characterized in that,

Positional information and the difference between mean value of using the above-mentioned continuous detecting of different arrangement storages to go out respectively belong to the beginning value with interior positional information.

3, as claim item 2 described Touch Screen noise filtering methods, it is characterized in that,

Remove and above-mentioned mean value between difference surpass the above positional information of beginning value, make its separately accumulative total beginning value export mean value with interior positional information.

4, as claim item 1 described Touch Screen noise filtering method, it is characterized in that,

Obtain the final position information of above-mentioned some continuously, needing the positional information of exporting and the positional information of having exported, the next positional information of output that needs to compare now, if need the positional information of output maximum or minimum now, just comprise the mean value that present position information is replaced with the positional information value of first the positional information value exported and next needs output, the step of exporting.