JPH028925A - Touch screen device - Google Patents

Abstract

PURPOSE:To easily execute coordinate adjusting works by providing a coordinate transforming constant updating means which displays a reference coordinate point at the time of coordinate adjustment and updates coordinate transforming constants stored in a transforming constant storing means based on inputted touched coordinates. CONSTITUTION:Coordinate transforming constants Kxa-Kxc and Kya-Kyc are calculated from the formulae I by a method of undetermined coefficient. A function processing means 33 updates the storing content of a coordinate transforming constant storing section 34 by means of each calculated constant and instructs a typer input/output control means 36 to reset a coordinate adjustment requesting flag 35. As a result, the flag 35 is reset and a coordinate transforming means 32 performs transforming operations based on the updated storing content of the storing section 34. The means 33 performs normal control operations. Therefore, the coordinate adjusting works can be performed easily by touching this touch screen device 2 by several times at each point in accordance with a guidance display on a CRT 40 when the coordinate adjusting works are carried out through this device 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) The present invention relates to a touch screen device for inputting coordinates on a screen of a screen display device by touch.

(Prior Art) In recent years, for example, touch screen devices that can be operated by directly touching the monitoring screen have been used as operating means for plant monitoring devices that monitor industrial plants, an example of which is shown in FIG. .

In the figure, a touch screen control device 1 detects touch coordinates by operating a touch screen device 2, and outputs the detection results as touch coordinate data TD to a process computer 3 and a touch coordinate display device 4. has been done.

The touch screen device 2 is attached to the screen of a CRT display device (not shown) used as a display device of the process computer 3.

In the touch screen control device 1, the XY switching device 11 switches the corresponding coordinate of the touch coordinate signal TA output from the touch screen device 2 to the X coordinate or the X coordinate, and the amplifier 12 switches the coordinate corresponding to the touch coordinate signal TA output from the touch screen device 2. The touch coordinate signal TA is amplified by a specified amplification factor, and the output signal is sent to the amplifier 13.
．． 14 and a comparison input terminal of comparator 15.

The amplifier 13 amplifies the touch coordinate signal TA corresponding to the X coordinate, its offset amount and gain are respectively adjusted by variable resistors 16 and 17, and its output signal is applied to one of the analog/digital converters 18. Output to the input terminal.

The amplifier 14 amplifies the touch coordinate signal TA corresponding to the X coordinate, and its offset amount and gain are respectively adjusted by variable resistors 19 and 20, and its output signal is applied to the other side of the analog/digital converter 18. Output to the input terminal.

The analog/digital converter 18 inputs the output signal of the amplifier 13 when the XY switching device 11 selects the X coordinate, and inputs the output signal of the amplifier 14 when the XY switching device 11 selects the Y coordinate. and converts those input signals into corresponding digital signals.
The digital signal of the conversion result is sent to the microprocessor 2.
It has been added to 1.

Basic P! The voltage generator 22 generates the output signal of the amplifier 12 as a base*S pressure signal Vr when the touch screen device 2 is not receiving touch input, and the reference voltage signal Vr is the voltage signal Vr of the comparator 15. It is added to the reference input terminal.

The comparator 15 detects that the signal voltage at the comparison input terminal has become smaller than the reference voltage signal Vr at the reference input terminal, and the comparison signal is applied to the microprocessor 21 as a touch detection signal TC. ing.

When the touch detection signal TC enters the touch input detection state while the XY switching device 11 is selecting the X coordinate, the microprocessor 21 switches the analog/digital converter 18
The output is input as X coordinate data, and the XY switching device 11
When the touch detection signal TC enters the touch input detection state while the Y coordinate is selected, the output of the analog/digital converter 18 is input as Y coordinate data.

And those X coordinate data and X coordinate data,
It is output to the process computer 3 and the touch coordinate display device 4 as touch coordinate data TD.

Therefore, when an operator touches any point on the screen of the CRT display device, a touch coordinate signal TA corresponding to that touch position is output, and the touch coordinate signal TA becomes smaller than the reference voltage signal νr. , the touch detection signal TC changes to the touch input detection state.

Thereby, the microprocessor 21 inputs the output digital signals of the analog/digital converter 18, which are switched in synchronization with the switching operation of the XY switching device 11, as X and Y coordinate data, and inputs the touch coordinate data T.
0 and outputs it to the process computer 3 and the touch coordinate display device 4.

As a result, touch coordinate data TD corresponding to the point touched on the touch screen device 2 is output to the process computer 3 and displayed on the touch coordinate display device 4. Note that this touch coordinate display device 4 is connected only during coordinate adjustment, which will be described later, and is not connected at all times.

By the way, the coordinates of the touch screen device 2 are shown in FIG.
As shown in a), the lower left point of the effective touch area is the origin, and as the X coordinate increases to the right, the Y coordinate increases upward.
It is a coordinate system with increasing coordinates.

In addition, the coordinates of the CRT display device used in the process computer 3 are as shown in FIG. This is a coordinate system in which the Y coordinate increases.

Therefore, the process calculator 3 converts the touch position 4m (X-r, Yr) of an arbitrary point Q corresponding to the touch coordinate data TD output from the touch screen control device 1 based on the following equation (1). , the coordinates (Xc, Yc) on the CRT display device are obtained.

(ri:)・(Kxa: にか（くり・(）り・・・・・・)
(I) Here, Kxa, Kxb, Kxc, Kya, Ky
b and Kyc are constants, and these constants are hereinafter referred to as coordinate transformation constants.

These coordinate transformation constants Kxa, Kxb, Kxc, Kya
, Kyb.

Kyc connects the touch screen device 2 and the CRT display device at the time when the touch screen device 2 is attached to the CRT display device.
It is calculated based on the mutual coordinate relationship of the display devices and is held in the process computer 3.

(Problems to be Solved by the Invention) The touch operation surface of the touch screen device 2 is made of a transparent resistive thin film or the like and deteriorates after long-term use, so it is replaced after a certain amount of use.

At the time of this replacement, it is rare that the coordinate characteristics of the touch screen device 2 after replacement completely match the coordinate characteristics of the touch screen device 2 before replacement, and usually the coordinate characteristics of the touch screen device 2 after replacement are It is necessary to perform adjustment work to match the coordinate characteristics of the touch screen device 2 before replacement.

This coordinate yA adjustment work is performed by connecting the touch coordinate display device 4 and checking the display on the touch coordinate display device 4 so that the coordinates of the specified position on the touch screen device 2 take the specified value. instrument 16゜17 and amplifier 1
This is done by appropriately adjusting the four variable resistors 19 and 20, which requires a great deal of precision and time.

As described above, conventionally, the adjustment work of the touch screen device 2 has been inconvenient.

The present invention aims to solve the problems of the prior art and provide a touch screen device that allows adjustment work to be easily performed.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a method for converting touch coordinates into display screen coordinates of a screen display device based on touch coordinates input when displaying a reference coordinate point during coordinate adjustment. The coordinate transformation constant updating means is provided for updating the coordinate transformation constant used in the coordinate transformation constant.

(Function) Therefore, by simply touching the reference point displayed on the screen display device? Affm work can be completed,
Adjustment work is greatly simplified.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a touch screen device according to an embodiment of the invention. In this figure, the same parts and corresponding parts as in FIG. 4 are given the same reference numerals.

In the figure, a CR7 display device 40 constitutes the display means of the process computer 3, and a CRT control device 4
1 forms display data to be displayed on the CRT display device 40.

In the process computer 3, the touch coordinate input means 31 inputs the touch coordinate data TD output from the touch screen control device I, and the touch coordinate data TD is input to the coordinate conversion means 32 and the function processing means 33.
is output to.

The coordinate transformation means 32 calculates the above formula ([) based on the coordinate transformation constant (see the above formula (I)) stored in the coordinate transformation constant storage section 34 and the manually generated touch coordinate data TD, and calculates CR7. It calculates the coordinate data on the display device 40, and the coordinate data CD is processed by the function processing means 3.
It is output to 3. Further, the coordinate conversion means 32 does not perform the conversion process when the coordinate adjustment request flag 35 is set.

The function processing means 33 executes various control processes executed by the process computer 3. I! When the I-adjustment request flag 35 is set, a coordinate adjustment process to be described later is performed, and when the coordinate adjustment request flag 35 is reset, a predetermined monitoring process is performed based on the coordinate data CD input from the coordinate conversion means 32. etc.

The typer input/output control means 36 obtains data from the human output typer 42 operated by an operator and outputs it to the function processing means 33, and also outputs the output data from the function processing means 33 to the input/output typer 42. be.

Further, when a coordinate adjustment request is inputted from the input/output typer 42, the coordinate adjustment request flag 35 is set, and when commanded from the function processing means 33, the coordinate adjustment request flag 35 is reset.

The reference Pg and target storage section 37 stores reference coordinates used in the coordinate adjustment process, and the display control means 38 controls display data displayed on the CR7 display device 40 by the function processing means 33 on the CR7 display device 40. The conversion result is output to the CRT control device 41.

With the above configuration, an example of processing during coordinate adjustment work will be described with reference to FIG. 2.

First, when the operator inputs a coordinate adjustment request from the input/output typer 42 (step St), the typer input/output control means 36 controls the coordinate adjustment request! l! An I adjustment request flag is set (step S2).

As a result, the coordinate conversion means 32 becomes inactive, and the function processing means 33 inputs the CRT reference coordinates from the reference coordinate storage section 37 (step S3). Here, C
The four points P1. shown in FIG. 3 are used as RT reference coordinates.
(0, Vcm), P2 (Xcm, Ycm), P3 (
Use Xcm, O) and P4 (0°0).

Then, the function processing means 33 displays point P1 on the CR7 display device 40 (step S4), and displays guidance on the CR7 display device 40 for the operator to input the displayed point by touch.

As a result, when the operator performs a touch operation on the touch screen device 2 (step S5), the touch coordinate data TO corresponding to the touch operation is transferred to the touch screen control device 1.
The touch coordinate input means 31 inputs the touch coordinates to the function processing means 33.

The function processing means 33 displays the touch coordinates input at this time on the CR7 display device 40, and inquires whether the touch operation was an erroneous touch (step S6).

In response, the operator checks the display content on the CR7 display device 40, determines whether or not it was an erroneous touch, and inputs the determination result through the input/output typer 42.

If it is determined in step S6 that the touch was an accidental touch (
If the result of step S6 is YES), the touch coordinate data TD input at that time is discarded and the process returns to step S5. If the touch is found to be normal (step S
If the result of 6 is No), the process advances to step S7.

In step S7, the function processing means 33 displays on the CR7 display device 40 whether or not to end the operation for the current point.
Display it on the screen and ask the operator. As a result, the operator inputs an instruction to terminate or continue using the input/output typer 42. At this time, if the intention to continue is input (the result of step S7 is NO), it is checked whether the coordinate data of the same point has been input a predetermined number of times (step S7).
8) When the result of step s8 is NO, return to step S5 and repeat the operation at the same point.

Further, when the result of step S8 is YES and when the result of step S7 is YES, the following formula (I
I) to calculate the average value of the touch input coordinates, i.e.
Calculate touch reference coordinate data (Xvi, Yri).

In step Sll, the coordinate transformation constant K
Calculate xa, Kxb, Kxc, Kya, Kyb, and Kyc, respectively.

That is, for any point Q on the C, RT display device 40, the distance in the X direction from the coordinate origin is ΔX, the distance in the Y direction is ΔY, and the coordinate axes of the screen of the CR7 display device 40 and the coordinate axes of the touch screen device 2 are If the angle formed by is 0, then
The following formula (III) holds true.

Here, n represents the number of input touches, j represents the touch order, and j represents each touch point.

Then, all points Pi, P2. P3. Step 5IO to determine whether the touch input operation is completed at P4.
), when the result of step 510 is NO, point P
With the next point selected among L, P2゜P3, and P4, return to step S5 and check that the result of step SiO is Y.
When it becomes ES, the process advances to step Sll.

Here, ΔXm and ΔYm are each CR7 display device 4
Indicates the distance in the X and Y directions of the effective area of the screen, XTm,
YTm is Δ in the touch screen device 2, respectively.
Xm.

The distance corresponding to ΔYm is shown.

Now, let XT, YT be unit vectors on the touch screen coordinate plane, and then the angles O, XTm, Yrm can be calculated using the following formula (■
).

(V).

In this way, the above formulas (TV) and (V) allow the formula (II
Once each coefficient of I) is determined, equation (III) can be transformed into equation (I), and therefore, the coordinate transformation constant Kxa,
Kxb.

Kxc, Kya, Kyb, Kyc can be calculated as shown in the following formula (VI) by the undetermined coefficient method.Next, the function processing means 33 calculates the coordinate transformation constants Kxa, Kxb, Kxc, Kya, Kyb,
Kyc updates the storage contents of the coordinate transformation constant storage unit 34 (step 512), and instructs the typer input/output control means 36 to reset the coordinate adjustment request flag 35 (step 512).
Step 513).

As a result, the coordinate adjustment request flag 35 is reset, so that the coordinate transformation means 32 performs the transformation operation based on the updated contents of the coordinate transformation constant storage section 34, and the function processing means 33 performs the normal Performs control processing.

In this way, when performing the coordinate adjustment work of the touch screen device 2, the operator only has to touch the points displayed on the CRT display device 40 several times according to the guidance display, which is a very simple operation. Coordinates of touch screen device 2: J4''!1 operation can be performed.

Furthermore, in this embodiment, since the four corner points of the effective display area of the CRT display device 40 are used as the reference coordinates, as shown in FIG. Even when the operation surface is mounted at an angle, it is possible to calculate appropriate coordinate conversion constants, and touch coordinates can be obtained with higher accuracy.

In addition, since a single point is touched multiple times, irregularities in the operator's touch operations can be eliminated, and data from incorrect touches are discarded, allowing for more accurate adjustment operations. be able to.

[Effects of the Invention] As explained above, according to the present invention, when converting touch coordinates into display screen coordinates of a screen display device based on touch coordinates input when displaying a reference coordinate point during coordinate adjustment, Equipped with a coordinate transformation constant updating means to update the coordinate transformation constants used, adjustment work can be completed simply by touching the reference point displayed on the screen display device, greatly simplifying adjustment work. This effect is obtained.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram showing a touch screen device according to an embodiment of the present invention, Fig. 2 is a flowchart 1 showing a processing example of the function processing section, and Fig. 3 is a coordinate adjustment A schematic diagram for explaining the operation, FIG. 4 is a schematic configuration diagram of the touch screen device, FIG. 5 (a) is a schematic diagram showing the coordinate system of the touch screen, and FIG. 5 (b) is a coordinate system of the CR7 display device. FIG. 32...Coordinate transformation means, 33...Function processing means, 3
5... Coordinate adjustment flag, 36... Typer input/output control means, 37... Reference coordinate storage unit. (7317) Agent: Patent Attorney Noriyuki Norichika (88)
69) Ken Daishimaru Figure 3

Claims (1)

[Claims] In a touch screen device that is attached immediately before the display screen of a screen display device and inputs coordinates on the screen of the screen display device, there is provided a coordinate conversion means for converting touch coordinates into display screen coordinates of the screen display device, and a coordinate conversion means for converting the touch coordinates into display screen coordinates of the screen display device. conversion constant storage means for storing coordinate conversion constants used during conversion calculations;
A touch screen device comprising: a coordinate conversion constant updating unit that displays a reference coordinate point during coordinate adjustment and updates a coordinate conversion constant stored in the conversion constant storage unit based on input touch coordinates.