JPH0438512A - Coordinate detection/display device - Google Patents

Abstract

PURPOSE:To easily cancel dissidence between an instructed point and a displayed point with simple configuration by correcting the coordinate the point instructed by an indicator for an arbitrary amount by using a correcting means while observing the displayed point. CONSTITUTION:An operator observes the instructed point of a stylus pen 2 and the point displayed by a liquid crystal display device 4 and when both the points are not coincident, a joystick lever 9a is suitabl operated. By this operation, a value corresponding to a manipulated variable is outputted from a correction value output point 9b, and the displayed point is moved only for a value corresponding to the correction value. Therefore, when using the device, the operator can easily make the instructed point coincident with the displayed point by putting the stylus pen 2 on a tablet 1 by one hand in the same posture as in normal use in the beginning and suitably operating the joystick lever 9a by the other hand in that state since the displayed point is moved correspond ing to the operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coordinate detection/display device that overlaps a tablet and a display surface of a display device to simultaneously detect coordinates and display the detected coordinates.

[Conventional technology]

The coordinate detection/display device overlaps the tablet for coordinate detection with the display surface of the display device that displays the designated coordinate point, and when the coordinate indicator points to an arbitrary position on the tablet, the coordinates on the display surface are This is a device that displays a point corresponding to the position, that is, a point indicated by a coordinate indicator. Such a coordinate detection/display device is disclosed in, for example, Japanese Patent Application Laid-Open No. 58-20038.
This is known from Publication No. 4, etc. The outline of the coordinate detection/display device will be explained below with reference to FIG.

FIG. 4 is a block diagram of a conventional coordinate detection/display device. In the figure, reference numeral 1 denotes a tablet for detecting coordinates, and as is well known, the Y-axis and the conducting wires for detecting the coordinates of the Y-axis are wired in a predetermined form.

A transparent insulator such as glass is used for this tablet 1, and each conductive wire is embedded therein.

Reference numeral 2 denotes a coordinate indicator (stylus pen) that indicates an arbitrary position on the tablet 1, and includes a coil and an excitation circuit that excites the coil. P indicates the position indicated with the stylus pen 2. 3 is a coordinate detection unit, which inputs the voltage induced in the conductor of the tablet 1 by the magnetic field generated by the coil of the stylus pen 2, processes this voltage and performs predetermined calculations, and calculates the coordinates of the position P. To detect. 4 is a liquid crystal display device, and a liquid crystal driver 5
Accordingly, any point on the display screen can be displayed. The display surface of the liquid crystal display device 4 and the tablet 1 are overlapped and combined. A host computer 6 outputs display commands to the liquid crystal driver 5 in response to input from the coordinate detection section 3.

When the operator indicates a position P on the tablet 1 with the stylus pen 2, the coordinate detection unit 3 detects the coordinates of the position P and outputs the values to the host computer 6. The host computer 6 creates data for displaying the input coordinates and outputs this to the liquid crystal driver 5.

The liquid crystal driver 5 drives the liquid crystal display device 4 in response to this, and displays the points instructed by the host computer 6. As a result, a dot is displayed at the tip of the stylus pen 2 at IP. As the stylus pen 2 is moved on the tablet 1, a dotted line or a solid line is displayed according to the trajectory of the movement.

[Problem to be solved by the invention]

The above coordinate detection/display device uses a stylus pen 2 to draw patterns such as letters, numbers, symbols, pictures, etc. on a piece of paper on paper using a stylus pen 2 (i.e., on the tablet 1).
It is possible to draw any pattern on the surface, and to point out any point on the drawn pattern, and is used in various fields. However, there is often a discrepancy between the indicated point and the display point of the stylus pen 2, and this discrepancy causes an operator to feel strange in use, resulting in a problem in that it is difficult to use. The reason for the above discrepancy will be explained with reference to FIGS. 5 and 6.

5 and 6 are partial side views of the tablet 1 and the liquid crystal display device 4, and FIG. 6 is enlarged in the thickness direction in contrast to FIG. 5. In each figure, the same parts as those shown in FIG. 4 are given the same reference numerals. 4a and 4b are upper and lower electrode support plates of the liquid crystal display device 4; 4c is an electrode support plate 4;
This is liquid crystal injected into the gap between a and 4b. Electrode support plate 4a.

4b, a transparent material is used for at least the electrode support plate 4a.

By the way, when the operator draws a pattern on the tablet press 1 with the stylus pen 2 or indicates a certain point, the operator applies the stylus pen 2 perpendicularly to the surface of the tablet 1 and directs the operator's eye to the stylus pen 2. It is extremely rare for it to come directly above the . If the instruction manual etc. instructs you to use the stylus pen 2 vertically,
Even if the operator follows this, the position of the operator's eyes is usually a certain angle away from the center line of the stylus pen 2. This state is shown in FIG. In FIG. 5, E indicates the position of the operator's eye, which is separated from the center 1c of the stylus pen 2 by an angle θ1.

Now, suppose that the operator points out a point P0 on the tablet 1 with the stylus pen 2, and in response, the liquid crystal display device 4 displays a point P0° directly below the point P0. However, due to the refractive index of the tablet 1 and the electrode support plate 4a, the point P0° appears to exist at the point P on the tablet 1 when viewed from the operator's eye E. in this way,
Since the operator's eye E is not directly above the stylus pen 2, the indicated point (P, ) and display point (P
, ), that is, a disparity (Pa PE) will occur.

Furthermore, if the operator is not instructed to use the stylus pen 2 vertically, or if the operator is not strongly aware of it even if instructed, the stylus pen 2
The writing instrument is often used in a somewhat tilted state, as is the case with ordinary writing instruments, and this state is shown in FIG. In FIG. 6, the same parts as in the fifth time are given the same reference numerals.

Normally, when point P0 is specified with the stylus pen 2, the liquid crystal display device 4 displays a point P. directly below point P0.

should be displayed. However, since the stylus pen 2 is tilted, the point P
,. Point P, deviated from. . will be displayed. Ultimately, due to this shift and the refractive index of the tablet 1 and the electrode support plate 4a, the display point is the point P on the tablet 1 when viewed from the operator's eye E.

It appears that there is a parallax (P(l Pi)) as in the case shown in FIG.

The purpose of the present invention is to solve the problems in the above-mentioned prior art,
An object of the present invention is to provide a coordinate detection/display device capable of eliminating mismatch between a designated point and a display point.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a tablet on which a coordinate detection lead wire is wired, an indicator for indicating an arbitrary position on the tablet, a display section combined with the tablet in an overlapping manner, a coordinate detection unit that detects the coordinates of the position indicated by the indicator based on the output signal of the coordinate detection conductor; and a display that displays the position on the display unit based on the coordinates obtained by the coordinate detection unit. A coordinate detection/display device comprising a drive section is characterized in that a correction means is provided for correcting the value obtained by the coordinate detection section by an arbitrary amount.

[Effect]

The operator indicates an arbitrary point on the tablet with the indicator, and in this state operates the correction means while looking at the indicated point and the display point displayed on the display section. A value corresponding to this operation amount becomes a correction value, and the coordinates obtained by the coordinate detection section are corrected. When the indicated point and the display point match, the operation of the correction means is stopped.

By using the correction value at this time, parallax can be easily and reliably eliminated.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 is a block diagram of a coordinate detection/display device according to an embodiment of the present invention, and the same parts as those shown in FIG. 4 are given the same reference numerals and their explanation will be omitted.

8 is a coordinate detecting section corresponding to the coordinate detecting section 3 shown in FIG. 4, and has the same coordinate detecting function, but is equipped with a correction means for correcting the detected coordinates and an A/D converter to be described later. This is different from the coordinate detection section shown in FIG. Reference numeral 9 indicates an offset instruction section, which is composed of a joystick lever 9a operated by an operator and a correction value output section 9b that outputs a value corresponding to the operation of the joystick lever 9a.

FIG. 2 is a circuit diagram showing the configuration of the coordinate detection section 8 and correction value output section 9b shown in FIG. 1. The coordinate detection unit 8 includes a detection circuit 8a1, a microcomputer 8b, and A/D converters 8X and 8Y. The detection circuit 8a is a circuit that processes the voltage induced in the conductor of the tablet 1,
Coordinates are calculated by the microcomputer 8b based on the signal from the detection circuit 8a. The A/D converters 8X and BY have a function of converting a signal from a correction value output section 9b, which will be described later, into a digital value. As mentioned above, the coordinate detecting section 8 differs from the coordinate detecting section 3 shown in FIG. 4 in that it includes correction means in the A/D converters 8X, BY and the microcomputer 8b, but the other configurations are the same. It's the same.

When the operating plane of the joystick lever 9a is defined by two orthogonal axes X and Y, the correction value output unit 9b
It is comprised of a potentiometer R8 that generates a voltage corresponding to the amount of operation in the axial direction and a potentiometer Rv that generates a voltage that corresponds to the amount of operation in the Y-axis direction. Potentiometer RX.

The output of RY is the A/D converter 8X of the coordinate detection unit 8.
, 8Y. Potentiometer R.

The output Vx, V of Rv is the joystick lever 9a.
Approximately 1/ of the applied voltage ■ when is in the neutral position
2 (A/D converter 8X at this time.

8Y output is set as value C0).

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG. When the operator turns on the power of the device (not shown) to detect and display coordinates, the microcomputer 8b of the coordinate detection section 8 detects that the stylus pen 2 is placed on the tablet 1 and reads the coordinates of that position. If it is determined that the coordinates can be read, the microcomputer 8b operates the stylus pen according to the processing signal from the detection circuit 8a. The coordinates specified in step 2 are calculated (step SZ). Next, the microcomputer 8b has an A/Di converter 8X.

Read the value of 8Y sequentially (step S), and combine this value and the above value C
The coordinates are corrected by adding the difference from 0 to the coordinates calculated in step S2 (step S,). Here, assuming that the joystick lever 9a is in the neutral position, the A/D converter 8
Since the outputs of X and 8Y are the value C0, the coordinates calculated in step St remain as they are. These coordinates are output to the host combinator 6 (procedure SS). The host computer 6 performs the display on the liquid crystal display device 4 using the same process as the conventional device.Next, the microcomputer 8b determines whether the detection/display operation has been completed based on the power ON/OFF state, etc., and then terminates the display. If not, repeat step S.
, -S are repeated.

In this state, the operator looks at the point indicated by the stylus pen 2 and the point displayed by the liquid crystal display device 4, and if the two do not match, he or she appropriately operates the joystick lever 9a. With this operation, each potentiometer Rx, Rv
The sliding body is displaced from the neutral position, and the correction value output section 9b outputs values V□ and Vv according to the operation amount (displacement amount). 41 V 1■v is converted into a digital value by A/D converters 8X and 8Y and output as a correction value.

The microcomputer 8b reads the above correction value in step S during the repetitive processing shown in FIG. 3, and in step S4 transfers this correction value to step S! Add to the coordinates obtained by processing. As a result, the display point moves by a value corresponding to the correction value. In the end, the display point is joystick lever 9a
It will move according to the direction and amount of operation.

Therefore, when using the device, the operator first
Place the stylus pen 2 on the tablet l with one hand in the same position as during normal use (eye position, tilt of the stylus pen 2), and then operate the joystick lever 9a with the other hand as appropriate. Since the display point moves according to the displayed point, the indicated point and the display point can be easily matched. Then, if the joystick lever 9a is fixed at that position when the two match, the coordinates will be corrected by the correction value corresponding to the values Vx and Vv at that position, and this correction value will be used from now on. As a result, the parallax between the pointing point and the display point caused by the position of the eye or the tilt of the stylus pen 2 is eliminated, and it is possible to draw a pattern or point out a predetermined point in exactly the same way as writing on paper with a writing instrument. can.

In the explanation of the above embodiment, a liquid crystal display device was used as an example of the display device, but the display device is not limited to this, and any device can be used as long as it can display a position corresponding to the coordinate input. It can also be used. Further, although the joystick lever 9a has been described as an example of the offset/instruction section, any structure can be used as long as it can create a correction amount in relation to two orthogonal axes. can. Furthermore, it is also possible to store the previously created correction values in an appropriate storage section and to correct the coordinates using the stored correction values.

〔Effect of the invention〕

As described above, in the present invention, the coordinates of the indicated point indicated by the indicator are corrected by an arbitrary amount by the correction means while looking at the displayed point. This can be easily solved by using a writing instrument, and in turn, it is possible to draw a pattern or indicate a predetermined point in exactly the same way as writing on paper with a writing instrument.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a coordinate detection/display device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a coordinate detection section and a correction value output section shown in FIG. 1, and FIG. 3 is a circuit diagram shown in FIG. 1. FIG. 4 is a block diagram of a conventional coordinate detection/display device, and FIGS. 5 and 6 are side views of a portion of a tablet and a liquid crystal display device. 1...Tablet, 2...Stylus pen, 4...Liquid crystal display device, 6...Host computer, 8...Coordinate detection section , 9...
...offset instruction section, 9a...joystick lever, 9b...correction value output section Fig. 3 Fig. 1 Fig. 2 Fig. 5 Fig. 6

Claims (5)

[Claims] (1) A tablet on which a conductor for coordinate detection is arranged, an indicator that indicates an arbitrary position on the tablet, a display section combined with the tablet in an overlapping manner, and an output signal based on the output signal of the conductor for coordinate detection. Coordinate detection/display comprising: a coordinate detection unit that detects the coordinates of a position indicated by the indicator; and a display drive unit that displays the position on the display unit based on the coordinates obtained by the coordinate detection unit. A coordinate detection/display device, characterized in that the device is provided with a correction means for correcting the value obtained by the coordinate detection section by an arbitrary amount. (2) In claim (1), the correction means includes an offset instruction section and an addition means for adding an offset instruction value output from the offset instruction section to a value obtained by the coordinate detection section. Coordinate detection and
display device (3) In claim (2), the offset instruction section includes an operation section for indicating an arbitrary point on a plane defined by two orthogonal axes, and a position of the arbitrary point corresponding to each of the axes. A coordinate detection/display device comprising: a correction value output section that outputs a value proportional to (4) The coordinate detection/display device according to claim (3), wherein the operation section is a joystick lever. (5) The coordinate detection/display device according to claim (3), wherein the correction value output section is comprised of a potentiometer.