CN101943981A - Method for processing touch screen pressing information of resistive touch screen - Google Patents

Abstract

The invention discloses a method for processing touch screen pressing information of a resistive touch screen, which comprises the following steps of: dividing the touch screen into a plurality of areas; dividing a large screen into small screens, and then adjusting positions of each small screen independently and finely.

Description

A method for processing touch screen press information of a resistive touch screen

technical field

The invention relates to a method for processing touch screen pressing information of a resistive touch screen, in particular to a method capable of processing touch screen pressing information of a resistive touch screen with a larger size.

Background technique

Today, with the rapid development of computer technology, various computer input methods such as keyboard input, mouse input, voice input, and image acquisition have appeared one after another, and the simplest and most natural method is directly on the computer screen. Click to input information and transfer instructions. For example, users only need to use a stylus or a finger to touch the icons or text on the computer screen to operate the computer, so that the human-computer interaction is more straightforward. This technology greatly facilitates those who do not understand computer operations. User. At present, touch and click input has become a very attractive computer interaction method, and is widely used in many fields such as city information service, industrial control, multimedia teaching, travel guide, and entertainment.

Existing touch screens still mainly adopt the resistive type, that is, use pressure sensitivity for control, and convert the physical position of the touch point (X, Y) in a rectangular area into a voltage representing the X coordinate and the Y coordinate. The main part of the resistive touch screen is a resistive film screen that is very compatible with the surface of the display screen. This is a multi-layer composite film. Conductive resistance), covered with a hardened, smooth and scratch-resistant plastic layer, and its inner surface is also coated with a transparent conductive layer, with many small (less than 1/1000 inch) transparent isolation points between them Separate and insulate the two conductive layers. When a stylus or finger is used to touch the screen, the two conductive layers are in contact at the touch point, and the resistance changes. One of the conductive layers is connected to a 5V uniform voltage field in the Y-axis direction, so that the voltage of the detection layer is changed by Zero becomes non-zero. After the controller detects this connection, it performs A/D conversion and compares the obtained voltage value with 5V to obtain the Y-axis coordinates of the touch point. Similarly, the X-axis coordinates can be obtained. Coordinates, and finally work in the way of simulating the mouse.

In most existing handheld mobile devices such as smartphones, PDAs, and UMPCs, due to the small size of the screen, the touch area can be displayed on a predefined fixed position on the touch screen, so that the user can use the stylus or hand in each step of operation. Just put it on the position where you want to touch the area and click the position. There are also some handheld mobile devices that use simple touch area registration or increase the size of the icon to achieve better touch effects. However, for handheld mobile devices with 5-inch or larger screens and running Windows operating systems, it will be a challenge to use resistive touch screens to realize refined human-computer interaction operations such as web browsing, window dragging and dropping, and edge icon clicking. sexual issues.

Contents of the invention

In order to overcome the disadvantage that the existing resistive touch screen touch screen pressing information processing method cannot be applied to larger resistive touch screens, the present invention provides a new resistive touch screen touch screen pressing information processing method, which uses the touch screen It is divided into four areas A, B, C, and D, and the large screen is divided into small screens, and then each small screen is finely adjusted independently.

The technical scheme that the present invention adopts for solving the problems of the technologies described above is:

A method for processing touch screen press information of a resistive touch screen, comprising the following steps:

A. Waiting for external touch input;

B. Determine whether there is a touch;

C. If there is a touch, the pressing coordinate information is obtained through the A/D conversion of the hardware circuit;

D. Coordinate position readjustment;

E. Store the location information and decrease the preset sampling times by 1;

F. Determine whether the number of samples is 0,

If it is not 0, continue to step C, if it is 0, go to step G;

G. Perform digital filtering on all stored position information to obtain desired pressing coordinate information;

H. Output the desired pressing coordinate information to the host,

Its touch screen is divided into M areas (M is greater than or equal to 2), and then fine-tuning each area independently.

Taking M equal to 4 as an example, its touch screen is divided into four areas A, B, C, and D with the vertical center line and horizontal center line as the boundary, and then finely adjust the position of each area independently. The position adjustment method in the D step is to first establish an XY two-dimensional coordinate system,

Edge adjustment method:

Area A: if x<10, then x=10; if y>2 ^N -7, then y=2 ^N -7;

Area B: if x>2 ^N -7, then x=2 ^N -7; if y>2 ^N -7, then y=2 ^N -7;

Area C: if x>2 ^N -7, then x=2 ^N -7; if y<7, then y=7;

Area D: if x<10, then x=10; if y<7, then y=7;

Non-edge adjustment methods:

Area A: if x<2 ^N-1 +1, then x-=9×(2 ^N-1 -1-x)/(2 ^N-1 -1),

If y>2 ^N-1 +1, then y+=17×(y-2 ^N-1 +1)/(2 ^N-1 -1)-τ;

Area B: if x>2 ^N-1 +1, then x+=7×(x-2 ^N-1 +1)/(2 ^N-1 -1)

If y>2 ^N-1 +1, then y+=17×(y-2 ^N-1 +1)/(2 ^N-1 -1)-τ;

Area C: if x>2 ^N-1 +1, then x+=7×(x-2 ^N-1 +1)/(2 ^N-1 -1),

If y<2 ^N-1 +1, then y-=25×(2 ^N-1 -1-y)/(2 ^N-1 -1)+τ;

Area D: if x<2 ^N-1 +1, then x-=9×(2 ^N-1 -1-x)/(2 ^N-1 -1),

If y<2 ^N-1 +1, then y-=25×(2 ^N-1 -1-y)/(2 ^N-1 -1)+τ,

Among them, N is the number of A/D conversion bits supported by the touch screen controller, τ is the correction value, τ∈[0,9], "+=" and "-=" are compound assignment operators, a+=b is equivalent to a=a+b; a-=b is equivalent to a=a-b.

The number of sampling times preset in the step E is 2 or 3.

The digital filtering in the G step adopts the mean value filtering method.

The beneficial effect of the invention is that the large-screen resistive touch screen can be applied.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is further described:

Fig. 1 is the area division figure of touch screen of the present invention;

Fig. 2 is a touch screen coordinate diagram of the present invention;

Fig. 3 is a flow chart of touch screen press information processing in the present invention.

Detailed ways

Below according to accompanying drawing and embodiment the present invention will be described in further detail:

As shown in the figure, this embodiment is a method for processing touch screen pressing information of a resistive touch screen, which includes the following steps:

A. Waiting for external touch input;

B. Determine whether there is a touch;

C. If there is a touch, the pressing coordinate information is obtained through the A/D conversion of the hardware circuit;

D. Coordinate position readjustment;

E. Store the location information and decrease the preset sampling times by 1;

F. Determine whether the number of samples is 0,

If it is not 0, continue to step C, if it is 0, go to step G;

G. Perform digital filtering on all stored position information to obtain desired pressing coordinate information;

H. Output the desired pressing coordinate information to the host,

Area division: define the position coordinates of the center point of the touch screen as (x ₀ , y ₀ ), divide the touch screen into four areas A, B, C, and D, and divide the large screen into small screens, and then divide each small screen The screen performs independent fine position adjustment.

Position adjustment method:

The invention patent supports both four-wire resistive touch screen and five-wire resistive touch screen. If the touch screen controller supports N-bit A/D conversion (currently there are two A/D conversion methods commonly used in the market, 8-bit and 12-bit), the coordinates of the touch screen area division position are (2 ^N-1 +1, 2 ^{N -1} +1). Create an XY two-dimensional coordinate diagram as shown in Figure 2.

Edge adjustment method:

Area A: if x<10, then x=10; if y>2 ^N -7, then y=2 ^N -7.

Region B: if x>2 ^N -7, then x=2 ^N -7; if y>2 ^N -7, then y=2 ^N -7.

Region C: if x>2 ^N -7, then x=2 ^N -7; if y<7, then y=7.

Area D: if x<10, then x=10; if y<7, then y=7.

Non-edge adjustment methods:

Area A: if x<2 ^N-1 +1, then x-=9×(2 ^N-1 -1-x)/(2 ^N-1 -1);

If y>2 ^N-1 +1, then y+=17×(y-2 ^N-1 +1)/(2 ^N-1 -1)-τ (τ is a correction value, τ∈[0,9]) .

Area B: if x>2 ^N-1 +1, then x+=7×(x-2 ^N-1 +1)/(2 ^N-1 -1);

If y>2 ^N-1 +1, then y+=17×(y-2 ^N-1 +1)/(2 ^N-1 -1)-τ (τ is a correction value, τ∈[0,9]) .

Area C: if x>2 ^N-1 +1, then x+=7×(x-2 ^N-1 +1)/(2 ^N-1 -1);

If y<2 ^N-1 +1, then y-=25×(2 ^N-1 -y)/(2 ^N-1 -1)+τ (τ is a correction value, τ∈[0,9]).

Area D: if x<2 ^N-1 +1, then x-=9×(2 ^N-1 -1-x)/(2 ^N-1 -1);

If y<2 ^N-1 +1, then y-=25×(2 ^N-1 -1-y)/(2 ^N-1 -1)+τ(τ is the correction value, τ∈[0,9] ).

Details: In the non-edge adjustment method, we do not use a correction value for the coordinates in the x-axis direction, mainly because its size is slightly larger than the y-axis. However, if the handheld mobile device supports the gravity sensing effect, this adjustment method will update the area division in real time according to the direction of gravity perceptual rotation, while the adjustment method and correction value of the X and Y axes remain unchanged.

Number of samples:

The number of sampling times is mainly based on the response time of the touch screen itself. Generally, it can be set to 2-3 times. This can not only ensure the speed of single-click and double-click, but also avoid the jumping phenomenon of touch points that may occur when clicking.

Digital filtering:

A touch screen press will store multiple location coordinate information. We use the mean value filtering method to calculate the final coordinate location and send it to the host to realize real-time human-computer interaction. Mean filtering is the simplest method in the implementation of digital filtering, and it can be used for real-time processing of pressing position information. Median filtering or other filtering methods can also be applied to the digital filtering method of the patent of the present invention.

Those skilled in the art do not depart from the essence and spirit of the present invention, there can be many variants to realize the present invention, the above description is only a preferred and feasible embodiment of the present invention, and it does not limit the scope of rights of the present invention. The equivalent structural changes made in the description of the invention and the accompanying drawings are all included in the scope of rights of the present invention.

Claims (4)

1. the touch screen of a resistive touch screen is pushed information processing method, and it may further comprise the steps:

A. wait for extraneous touch input;

B. judged whether touch-control;

C. if any touch-control, obtain by hardware circuit A/D conversion and to push coordinate information;

D. coordinate position is readjusted;

E. stored position information subtracts 1 with the sampling number that presets simultaneously;

F. judge whether sampling number is 0,

As not being 0, continue the C step, as be 0, enter the G step;

G. all positional informations of storage are carried out digital filtering, what obtain expecting pushes coordinate information;

H. the coordinate information of pushing that will expect outputs to main frame,

It is characterized in that its touch-screen is divided into M zone (M is more than or equal to 2), then to the position adjustment that independently becomes more meticulous of each zone.

2. the touch screen of a kind of resistive touch screen as claimed in claim 1 is pushed information processing method, it is characterized in that, its touch-screen is that the boundary is divided into A, B, four zones of C, D with vertical center line and horizontal center line, then to the position adjustment that independently becomes more meticulous of each zone, location regulation method in the described D step is, set up the XY two-dimensional coordinate system earlier

The edge method of adjustment:

A-quadrant: if x＜10, then x=10; If y＞2 ^N-7, y=2 then ^N-7;

B zone: if x＞2 ^N-7, x=2 then ^N-7; If y＞2 ^N-7, y=2 then ^N-7;

C zone: if x＞2 ^N-7, x=2 then ^N-7; If y＜7, then y=7;

D zone: if x＜10, then x=10; If y＜7, then y=7;

Non-edge method of adjustment:

A-quadrant: if x＜2 ^N-1+ 1, x-=9 * (2 then ^N-1-1-x)/(2 ^N-1-1),

If y＞2 ^N-1+ 1, y+=17 * (y-2 then ^N-1+ 1)/(2 ^N-1-1)-τ;

B zone: if x＞2 ^N-1+ 1, x+=7 * (x-2 then ^N-1+ 1)/(2 ^N-1-1),

If y＞2 ^N-1+ 1, y+=17 * (y-2 then ^N-1+ 1)/(2 ^N-1-1)-τ;

C zone: if x＞2 ^N-1+ 1, x+=7 * (x-2 then ^N-1+ 1)/(2 ^N-1-1),

If y＜2 ^N-1+ 1, y-=25 * (2 then ^N-1-1-y)/(2 ^N-1-1)+τ;

D zone: if x＜2 ^N-1+ 1, x-=9 * (2 then ^N-1-1-x)/(2 ^N-1-1),

If y＜2 ^N-1+ 1, y-=25 * (2 then ^N-1-1-y)/(2 ^N-1-1)+τ,

Wherein N is supported A/D switch bit number by the touch screen controller, and τ is a modified value, τ ∈ [0,9], and " +=" and "=" is compositive assignment operator, a+=b is equivalent to a=a+b; A-=b is equivalent to a=a-b.

3. the touch screen of a kind of resistive touch screen as claimed in claim 1 is pushed information processing method, it is characterized in that: the sampling number that presets in the described E step is 2 times or 3 times.

4. the touch screen of a kind of resistive touch screen as claimed in claim 1 is pushed information processing method, it is characterized in that: the digital filtering in the described G step adopts the mean filter method.

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