JPS61194523A - Coordinate input display device - Google Patents

Abstract

PURPOSE:To always secure coincidence between input coordinates and displayed ones by calculating the corrected coordinate value corresponding to the input coordinates given from a coordinate correction table and the digital value position signal and obtaining the correct coordinate data to display it. CONSTITUTION:The (x) and (y) coordinate position signals supplied from a coordinate input part 11 are amplified up to a fixed level by amplifiers 12x and 12y respectively. Then these amplified signals are sampled and held by sample and hold circuits 13x and 13y and converted into digital (x) and (y) coordinate position signals. These digital position signals are supplied to the (x) and (y) coordinate correction tables 16x and 16y storing previously the corrected coordinate value in accordance with the characteristics of an input part 11. Then the (x) and (y) coordinate correction values corresponding to those coordinate position signals are added to the (x) and (y) coordinate position signals by addition/subtraction circuits 17x and 17y respectively. Thus it is possible to obtain the (x) and (y) coordinate position signals which underwent the correction of input positions. Then these position signals are written into a video memory 19 and can be displayed at a coordinate display part 18.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention integrates a coordinate input surface and a coordinate display section, and corrects the input coordinates so that the coordinate input point and the coordinate display point coincide. The present invention relates to a coordinate input display device.

[Conventional technology]

As an input position detection device, a pressure-sensitive resistor sheet as shown in Japanese Patent Application Laid-Open No. 59-126712 is used to input information by utilizing a change in resistance at the pressed position, and other electrostatic There are coupled types, electromagnetic induction types, etc. but,
These input position detection devices have a problem in that coordinate detection values are distorted with respect to coordinates input to the input position detection device due to nonuniformity of the resistor, nonuniformity of capacitance, and the like.

In addition, in order to improve the man-machine interface, the input position detection device was made optically transparent, integrated with a flat display panel such as a plasma display panel or EL, and the coordinate input surface and the coordinate display surface were made the same, making the coordinate input surface the same as the coordinate display surface. A coordinate input display device that displays coordinates input to a computer has been proposed.

An example of such a coordinate input display device is shown in FIG. In this figure, 1 is an optically transparent pressure-sensitive resistive coordinate input surface, 2
is a plasma display panel.

[Problem that the invention seeks to solve]

FIG. 7 shows an example in which coordinates are input and displayed on the coordinate input display device of FIG. 6, and in this figure, 3 is the input coordinate and 4 is the display coordinate. As described above, since the coordinate input point and the coordinate display point do not match, there is a problem that when adding a line, it does not connect with the previously drawn line.

This invention was made to solve the above problem, and in a coordinate input display device that incorporates a coordinate input surface and a coordinate display section, the input coordinates always match the displayed coordinates. It is an object of the present invention to provide a coordinate input display device.

[Means for solving problems]

The coordinate input display device according to the present invention includes: an AD conversion circuit that converts an analog value coordinate position signal obtained from a coordinate input surface into a digital value position signal; a coordinate generation circuit that generates digital value coordinate data; A subtraction circuit that calculates the difference between the digital value position signal, a coordinate correction table that stores the calculation result of this subtraction circuit, and an addition/subtraction circuit that adds and subtracts the digital value position signal and the coordinate correction value output from the coordinate correction table. , a display circuit for displaying coordinate data generated by a coordinate generation circuit on a coordinate display section, and an operation mode control circuit for controlling a coordinate input display mode to a coordinate correction value writing mode.

[Effect]

In which invention, the operation mode control circuit sets the coordinate correction value writing mode and stores the coordinate correction values in the coordinate correction table. Then, when the operation mode control circuit is set to the coordinate input display mode and coordinates are input, a coordinate correction value corresponding to the input coordinates is output from the coordinate correction table, and an addition/subtraction circuit performs calculations between this value and the digital value position signal. I,
It is output as correct coordinate data and displayed on the coordinate display section.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention.

In this figure, 11 is the coordinate input surface of the coordinate input display device, 12
x, 12y are amplifiers, 13X, 13y are sample and hold circuits, 14x, 14y are AD conversion circuits, 15x, 15
y is a subtraction circuit, 16X.

16y is an X coordinate correction table and an X coordinate correction table composed of a rewritable random access memory, 1
7x and 17y are addition/subtraction circuits, 18 is a coordinate display section of the coordinate input display device, and 19 is a video memory of the coordinate display section 18. 20 is a video memory control circuit, 21X is an X coordinate generation circuit, and 21y is an X coordinate generation circuit, and these constitute a display circuit. 22 is an operation mode control circuit.

Note that the coordinate input surface 11 and the coordinate display section 18 shown in FIG. 1 are integrated as shown in FIG.
In the figure, for convenience of explanation, they are shown separately.

There are two modes for operating this, and the operation mode control circuit 22 controls them into a coordinate input/display mode and a coordinate correction value writing mode.

First, prepare the X coordinate correction table 16X in advance.

X coordinate correction value: y in the X coordinate correction table 16y
It is assumed that coordinate correction values are stored (this will be explained later). The operation mode control circuit 22 is set to coordinate manual/display mode and operated.

Note that the operation mode control circuit 22 sets the X coordinate correction table 16x and the y coordinate correction table 16y to read mode, and the video memory control circuit 20 sets the addition/subtraction circuits 17x, 1
Coordinates from -7y are selected.

After amplifying the X-coordinate position signal and the X-coordinate position signal from the coordinate input surface 11 to a certain level with amplifiers 12x and 12y, sample and hold circuits 13x and 13y, and A/D conversion circuit 14X, 14V. , an analog value X-coordinate position signal, converting the X-coordinate position signal into a digital value X-coordinate position signal, X-coordinate position signal.

Then, according to the characteristics of the coordinate input surface 11, the X coordinate position signal and the The addition/subtraction circuit 17x adds the X coordinate correction value and the y coordinate correction value corresponding to the signal of
, 17y respectively, the X coordinate position signal of the digital value,
By adding and subtracting from the X-coordinate position signal, an X-coordinate position signal and an X-coordinate position signal each having a corrected input position are output.

Further, by selecting the X coordinate position signal and the X coordinate position signal obtained by correcting the input positions from the addition/subtraction circuits 17x and 17y by the video memory control circuit 20 and writing them into the video memory 19, they can be displayed on the coordinate display section 18. .

Here, the correction values stored in the X coordinate correction table 16x and the V coordinate correction table 16y will be explained using FIG. 2.

FIG. 2 shows an example of the relationship between the coordinate position signal and the coordinate correction value, where 23 is the input coordinate and 24 is the detected coordinate value. FIG. 2 shows that when the coordinates l0 (IX, IV) on the coordinate input surface 11 are input, the coordinate position signal Oo (Ox
*Ov) is output, and if the coordinate position signal 00 is displayed without correction, it will be displayed as 00 even though the coordinate IO has been input. For this reason, both the x and y coordinates are corrected, but here,
The X coordinate correction value Cx and the l coordinate correction value C2 are Cx = Ix Ox, Cy = Iy Oy
can be expressed respectively. Therefore, the X coordinate correction values Cx,' are set at the addresses (Ox, Oy) of the X coordinate correction table 1sx and the y coordinate correction table 16y.
By writing each of the ll coordinate correction values C2, the corrected X-coordinate position signal Ox and Y-coordinate position signal O'y are as follows: 0'x = Ox + Cx = ox+ (Ix 0x)
= IxO'y =Oy + Cy =Oy + (I
y 0y) = IV, and the coordinates Io (Ix.

The same coordinates as IJ are output, and it can be seen that the correction can be made well. 'Next, the operation of the coordinate correction value writing mode in the circuit shown in FIG. 1 will be described. First, the operation mode control circuit 22 puts the X coordinate correction table 16x and the y coordinate correction table 16y into the coordinate correction value writing mode, puts the 20
is brought into a state where coordinate values from the X coordinate generation circuit 21x and the y coordinate generation circuit 21y are selected. Then, one point is displayed on the coordinate display section 18 by the X coordinate generation circuit 21x and the y coordinate generation circuit 21y. Next, from the coordinate input surface 11, the coordinate display section 1
Input the coordinates of the three points corresponding to the display section 8.

Figure 3 shows the relationship between the coordinate display point and an example of the output of the coordinate position signal when the coordinates are input, where 23 is the input coordinate, 24
is the detected coordinate value. In other words, X shown in Figure 1
The coordinate generation circuit 21x and the y-coordinate generation circuit 21y sequentially generate the coordinates of the points ■, ■, ◎, ■, etc. shown in FIG. 3, and the coordinate display section 18 lights up. Correspondingly, the coordinates are input to the points corresponding to each point on the coordinate manual section 11.

As an example, when the points (Ix, Iy) in FIG. 3 are turned on and coordinates are input at the same points, the coordinate input surface 11 outputs an X coordinate position signal Ox and a V coordinate position signal Oy. At this time,
In FIG. 1, an X-coordinate position signal Ox and a V-coordinate position signal Oy, which have been converted into digital values, are output from AD conversion circuits 14X and 14V nj. Next, the subtraction circuit 15x subtracts the X-coordinate position signal Ox from the digital value of the X-coordinate I8 generated by the X-coordinate generation circuit 21x.
08) is output. And the X coordinate correction table 16
Write (IX 0) l) as the X coordinate correction value to the x address (Ox, OV). Similarly, in the y-coordinate correction table lay, the above-mentioned X
The value obtained by subtracting the coordinate position signal Oy by the subtraction circuit 15y (IV
OV). By performing this for typical coordinates on the coordinate input surface 11, it is possible to create the X-coordinate correction table 16x and the y-coordinate correction table 16y.

According to the above configuration, the coordinate input surface 1 of the coordinate input display device
Even if there is coordinate detection distortion in 1, each coordinate correction table 1
Since the coordinate correction values are stored in 6X and 16y, and the coordinate detection bias can be corrected using the coordinate correction values, the input coordinates 23 can be detected with high accuracy. In addition, in order to perform correction after integrating the coordinate input surface 11 and the coordinate display section 18,
The coordinate input point and the display point match, allowing better coordinate input and reducing adjustment costs.

For convenience of explanation, the sample and hold circuits 13x and 13y and the AD conversion circuit 14x are shown in FIG.

Although two sets of 14y are used, this method can be realized with one set by switching and using the y-axis and the y-axis in a time-sharing manner.

Furthermore, even if a device with peripheral display distortion such as a CRT is used as the coordinate display section 18, the distortion of the coordinate input surface 11 and the coordinate display section 18 can be comprehensively corrected by each coordinate generation circuit of the coordinate input surface 11. It is possible to do so.

Next, interpolation of coordinate correction values will be explained.

FIG. 4 shows a circuit for interpolating coordinate correction values in this invention. In this figure, 16x1 to 16x3 are X coordinate correction tables, 16y1 to 16y3 are y coordinate correction tables, and 25x, 25y, 27x, and 27y are addition/subtraction. circuit, 26
x+, 28 X2.26yl, 2672 is a multiplication circuit. FIG. 5 shows the principle of interpolation.

In FIG. 5, the horizontal axis is the X-coordinate position signal, and the vertical axis is the y-coordinate position/signal. Furthermore, the intersections of the broken lines indicate coordinates for which coordinate correction values are prepared in advance. Here, X
The coordinate correction value when the coordinate position signal Sx and the y-coordinate position signal Sy are output is calculated as follows.

First, the closest four points Cu(Oxt) of the coordinate position signal S.

0VI), C12 (OXI, 0yz), Cz+ (
OX2, Oxt).

The X coordinate correction value of C22 (OX2, 0V2) is C+ r
x *C+2x, C2+x, C22x, Y coordinate correction value CIIV, Cl2V.

C21y, C24y, the X coordinate correction value 5cy-+'l coordinate correction value S of the coordinate position signal S. y is.

However, it becomes. Approximating this, S...-〇... +5ゝ14''-CBx-・(Sx-
Ox・)Ox2−0×1 C12x −Cl1x +□・(Sy−Oyl)・・・・・・(1) Oy 2−
0' v 1 3. ,=c,,, +Cl2V-CIlm・(Sx-O
xt) OX2-OXI +5 22 kings, (sy-Oyl)...(2)
It becomes OV2-OVI. Therefore, this X, y coordinate correction Scx+
By multiplying the coordinate position signal by S'cy, the coordinate position signal can be corrected.

Here, looking at the X coordinate correction value Sex shown in equation (1), the first term 011x indicates the correction value for the typical coordinates of the input surface, and in Figure 4, the X coordinate correction tape le 16
Store it in x+. Second term (C width - 〇+tx)/
(O2 0x+) indicates the change in the X-coordinate correction value ScX in the X direction, and is stored in the X-coordinate correction table 16X2, and (Sx-0X1) indicates the X-coordinate position signal S
This is the difference between x and the coordinate Ox I that stores the referenced correction value, and both are multiplied by the multiplication circuit 26X1. Third
The term is the same as the second term, and it shows the X coordinate component, and the X coordinate complement 1E (change in y direction of IfnSCX (
Cl2O-CIIX)/(OV2-OVI) is stored in the X-coordinate correction table 16X3, and the difference in the X-coordinate (Sy
-Oy+) is performed by the multiplication circuit 26X2. Then, these additions are performed by addition/subtraction circuits 25x and 27x,
An addition/subtraction circuit 17x performs addition with the X-coordinate position signal Sx to correct the X-coordinate position signals S and x. Further, the y-coordinate position signal SV can also be generated in the same manner using equation (2) using the F half circuit in FIG.

According to this, even if the detected coordinate values are distorted, the input position can be detected with high accuracy by adding or subtracting the coordinate correction values stored in the coordinate correction table, and the scale of the coordinate correction table can be further increased. Can be made smaller. Furthermore, by interpolating the coordinate correction values, distortions in the detected coordinate values can be corrected with high precision. Note that in Section 1-1, for convenience of explanation, a circuit was described in which three coordinate correction tables were provided for the X coordinate and three for the X coordinate;
It is also possible to configure it with an adding circuit, a microprocessor, etc.

〔Effect of the invention〕

- As explained above, the present invention provides a coordinate input display device that incorporates a coordinate input surface and a coordinate display section, in which coordinates generated in a coordinate generation circuit and coordinates generated on the coordinate input surface are displayed on the coordinate display section. Then, after storing the coordinate correction value obtained by calculating the coordinate position signal obtained by inputting the coordinates into the coordinate input screen corresponding to this coordinate in the coordinate correction table, use this coordinate correction value to input the coordinates. Since it is a coordinate human input/display device that corrects the coordinate position signal from a surface, it can match the coordinate input point and the coordinate display point with high precision, making coordinate input easy, and it is also possible to detect the coordinate position with high precision. Furthermore, even if there is a change over time in the coordinate input surface, detection circuit, etc., the coordinate correction table can be easily rewritten, so there is an advantage in that it can cope with this change.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams of the operation of Fig. 1, Fig. 4 is a circuit diagram for interpolating coordinate correction values, and Fig. 5 is an interpolation diagram. A diagram to explain the principle,
FIG. 6 is a perspective view showing the appearance of the coordinate input device 1, and FIG. 7 is a coordinate input/display system. - shows an example; In the figure, 12x, 12y are amplifiers, 13x, 13y are sample and hold circuits, 14X, 14Y are AD conversion circuits,
15x, 15y are subtraction circuits, 16x is an X coordinate correction table, 16y is an X coordinate correction table, 17x, 17y are addition/subtraction circuits, 18 is a coordinate display section, 19 is a video memory, 2
0 is a video memory control circuit, 21X is an X coordinate generation circuit,
? 1y is an X coordinate generation circuit, 22 is an operation mode control circuit,
23 is an input coordinate, and 24 is a detected coordinate value. -δ-shi 0, >-8 dFigure 4Figure 5

Claims (1)

[Claims] In a coordinate input display device in which a coordinate input section and a coordinate display section are integrated, and the coordinate input surface and the coordinate display surface are the same: AD conversion for converting an analog value coordinate position signal obtained from the coordinate input section into a digital value position signal. a circuit; a coordinate generation circuit that generates coordinate data of digital values; a subtraction circuit that calculates the difference between the coordinate data generated from this coordinate generation circuit and the digital value position signal; and a calculation result of this subtraction circuit that is stored. a coordinate correction table for adding and subtracting the digital value position signal and the coordinate correction value output from the coordinate correction table; and a display circuit for displaying the coordinate data generated by the coordinate generation circuit on the coordinate display section. and; displaying the coordinate correction values of the coordinate correction table, the coordinate data of the digital values generated by the coordinate generation circuit, and the coordinate data of the digital values on the coordinate display section in the display circuit; The subtraction circuit calculates a difference between a coordinate position signal of an analog value obtained by inputting coordinates into the coordinate input section corresponding to the displayed coordinates and a coordinate position signal converted into a digital value by the AD conversion circuit. The analog value position signal obtained from the coordinate input section is converted into a digital value position signal by the AD conversion circuit, and the coordinate correction value is stored in the coordinate correction table as a coordinate correction value. an operation of obtaining a corrected digital value position signal by adding and subtracting the digital value coordinate signal corresponding to the digital value position signal obtained by inputting the value position signal into the coordinate correction table and the digital value position signal in the addition/subtraction circuit; A coordinate input display device comprising: a mode control circuit;