JPH01102624A - Information input/output device - Google Patents

Abstract

PURPOSE:To simplify the constitution and the operation of an information input/output device by ensuring the proper inversion of the input/output information even in either case where the input/output of information is performed on the upper or rear surface sides of an information input/output means. CONSTITUTION:A coordinate input device 81 which is capable of input of infor mation through both upper and rear surface sides in an ultrasonic wave system, etc., is combined with a coordinate output device 82 which can confirm the output of information through both upper and rear surface sides of a liquid crystal display device, etc., in a coordinate input/output device 11. At the same time, an upper/rear surface detecting switch 13 using a limit switch, etc., is set at a position near a side 14 of a device main body 12 to identify the upper surface side of the device 11 at present. Thus, the working surface side of the device 11 is automatically detected and the input/output data are converted in accordance with the working surface side of the device 11. Thus, the device 11 can be freely used through its both surface sides with no troublesome opera tion required.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information input/output device, and particularly to an information input/output device that integrates a coordinate input device and a display.

[Prior Art] Coordinate input devices using various input pens, tablets, etc. have been known as devices for inputting handwritten characters, figures, etc. to a processing device such as a computer. In this type of system, input image information consisting of characters, graphics, etc. is output to a display device such as a CRT display or a recording device such as a printer.

In particular, in the coordinate input method that inputs coordinates using ultrasonic vibrations, the tablet can be constructed from a transparent material such as an acrylic plate or a glass plate. A configuration is being considered that integrates the display screen with the display screen.

According to this configuration, by displaying handwritten characters and images input via the coordinate input device in their original size on the display, information input with a good operational feel that can be used as if writing images on paper is possible. You can configure output devices.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, the coordinate input device and the display device are simply overlapped, and the coordinate input/output device is placed on top of a book or picture to display pictures, letters, etc. Processing such as copying the image was not possible.

In view of this point, a mechanism has been considered in which the coordinate input/output device is slid from the top of the device body including the display so as not to change the coordinate input surface, but this has the problem of complicating the configuration.

On the other hand, since inputs can be made from both the front and back sides of glass tablets using the ultrasonic method, it is also possible to use the zero method, which separates the device body from the coordinate input section and copies other images. If you are not careful about the front and back sides of the coordinate input/output device, there is a risk that the coordinate system will be reversed and you will not be able to input coordinates correctly.

In addition, when separating the coordinate input section, if it is assumed that input will be performed from both the front and back sides, it is necessary to provide a switch to invert the coordinate system.
There was a problem that the operation became complicated.

Although the case where only the coordinate input section is separated from the main body has been considered above, the same problem also occurs in a configuration in which the display section and the coordinate input section are separated from the apparatus main body while being integrated. The problem of unintentional inversion of the coordinate system also applies to the display coordinate system.

[Means for Solving the Problems 1] In order to solve the above problems, in the present invention, a display means that is visible from both the front and back sides, and a transparent coordinate input means that can be input from both the front and back sides are laminated, An integrated information input/output means and a means for detecting which side of the information input/output means is used for display or coordinate input are provided, and the display means or coordinate input is performed according to the output of the detection means. A configuration is adopted in which data input and output by the information input/output means is inverted so that display and coordinate input can be performed from either the front or back side of the information input/output means.

[Operation] According to the above configuration, it is automatically detected whether the information input/output means is used from the front or back side, and the input/output data is converted depending on the state of the used side. 1. Information input/output devices can be used from both the front and back without requiring any troublesome operations.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 shows an information input/output device employing the present invention.

In FIG. 1, reference numeral 11 denotes a coordinate input device (81) such as an ultrasonic system that allows input from both the front and back sides, and a coordinate output device (81) such as a liquid crystal display that allows output to be viewed from both the front and back sides.
82) is shown.

The coordinate input/output device 11 is swingably supported at a side 14 with respect to the processing device main body 12, and a swinging means such as a hinge is provided at the zero side 14.

In this embodiment, a front/back detection switch 13 using a limit switch or the like is provided near the side 14 of the device body 12 in order to detect which side of the coordinate input/output device 11 is currently facing up.

In this embodiment, the collapsible coordinate input device 11, which is swingably supported by the swing axis of the side 14, is normally swung in the direction indicated by the symbol and is used in close contact with the main body 12. The device can be used even when rotated about the swing axis of the side 14 in the direction. With this configuration, other images such as books can be easily copied using the coordinate input/output device 11 by swinging the coordinate input/output device 11 in the m direction.

When the coordinate input/output device 11 is swung in the direction of the arrow or the direction of the m, the coordinate input/output device 11 is used from both the front and back sides. Therefore, unless the input coordinate system and the display coordinate system are appropriately inverted depending on the surface of use, there is a risk that the display will be turned upside down or that coordinate information will not be properly input.

However, in this embodiment, the front/back detection switch 13
The switch 13 is pressed when the input/output device 13 is swung in one direction and is on the device body 12, and the pressed state is not formed in any other state. By converting the input and output coordinate information according to the output information, the coordinate input/output device 11
Appropriate coordinate input/output can be performed depending on the usage surface.

The configuration for enabling such processing will be described in detail below.

Figure 2 shows the structure of the coordinate input/output system.

In this embodiment, a transparent liquid crystal that can be viewed from both the front and back sides is used as the output device (82), and its front or back glass surface is used as the vibration transmission plate 26, allowing input and output from both the front and back sides. Configuring the output device. The vibrating pen 20 that inputs coordinates to the vibration transmitting plate 26 has a built-in vibrator 24 made of a piezoelectric element, etc., and the vibration generated by the vibrator 24 is transmitted to the vibration transmitting material 26 via the horn 25 at the tip of the pen 20. be done.

In FIG. 2, reference numeral 21 is an arithmetic control circuit consisting of a microcomputer, etc., and an RO which stores a program.
It has a built-in RAM for storing M and operation information.

The arithmetic control circuit 21 periodically drives the vibrator 24 of the vibrating pen 20 at a predetermined timing via the vibrator drive circuit 22, and measures the time from the drive timing until vibration is detected by each vibration sensor 27. .

The timing of detection by the vibration sensor 27 is determined by the vibration waveform detection circuit 23 having a configuration described below according to the vibration transfer characteristic.

The vibration transmission plate 26 transmits vibrations transmitted from the vibrating pen 20 to vibration sensors 27 including three piezoelectric elements provided at its corners.

The vibration transmitting plate has its peripheral portion supported by an anti-reflection material 28 made of silicone rubber or the like in order to prevent vibrations transmitted from the vibrating pen 20 from being reflected at the peripheral portion and returning toward the center. There is.

On the other hand, the vibrating pen 20 is constructed as shown in FIG.

A vibrator 24 built into the vibrating pen 20 is driven by a vibrator drive circuit 22. The drive signal for the vibrator 24 is the second
The signal is supplied as a low-level pulse signal from the arithmetic control circuit 21 shown in the figure, and after being amplified by a predetermined gain by the vibrator drive circuit 22 capable of low impedance driving, the vibrator 2
4.

The electrical drive signal is converted into mechanical ultrasonic vibration by the vibrator 24 and transmitted to the diaphragm 26 via the horn section 25.

The vibration frequency of the vibrator 24 is selected to a value that can generate plate waves in the vibration transmission plate 26 made of acrylic, glass, or the like. Further, when driving the vibrator, a vibration mode is selected in which the vibrator 24 mainly vibrates in the vertical direction in FIG. 3 with respect to the vibration transmission plate 26. Further, by setting the vibration frequency of the vibrator 24 to the inter-resonant wave number of the vibrator 24, efficient vibration conversion is possible.

The elastic waves transmitted to the vibration transmission plate 26 as described above are plate waves, which have the advantage that they are less susceptible to the effects of scratches, obstacles, etc. on the surface of the vibration transmission plate 26 than surface waves.

According to such a configuration, the coordinates of the vibrating pen 20 on the vibration transmitting plate 27 can be determined by measuring the transmission time of the ultrasonic vibration transmitted from the vibrating pen 20 to the vibration sensor 27 via the vibration transmitting plate 8. Can be detected.

FIG. 4 shows the structure of the arithmetic control circuit 21 of FIG.

The microcomputer 31 includes an internal counter, ROM, and RAM. The drive signal generation circuit 32
It outputs a drive pulse of a predetermined frequency to the vibrator drive circuit 22 shown in the figure, and is activated by the microcomputer 31 in synchronization with the coordinate calculation circuit.

The count value of the counter 32 is latched into the latch circuit 33 by the microcomputer 31.

On the other hand, the waveform detection circuit 23 in FIG. 2 outputs timing information of a detection signal for measuring the vibration transmission time for coordinate detection from the output of the vibration sensor 6 as described later. , these timing information are input to the input port 35.

The timing signal input from the waveform detection circuit 23 is stored in a storage area corresponding to each vibration sensor 27 in the latch circuit 33 via the input port 35, and the result is transmitted to the microcomputer 31.

That is, the vibration transmission time is expressed as a latch value of the output data of the counter 32, and coordinate calculation is performed using this vibration transmission time value. At this time, the determination circuit 34 determines whether all waveform detection timing information from the plurality of vibration sensors 6 has been input, and
Notify 1. The microcomputer 31 starts the coordinate calculation, which will be described later, when the time data necessary for the coordinate calculation from the three sensors 27 is collected.

Here, vibration waveform detection processing using the waveform detection circuit 23 and the detailed configuration of the waveform detection circuit 23 will be explained.

FIGS. 5(a) to 5(f) are explanatory diagrams of input and output signals of the vibration waveform detection circuit 2 in coordinate detection processing. Figure 5(a)
is the drive signal waveform, which consists of sporadic pulses. FIG. 5(b) shows a waveform detected by the vibration sensor 27, which is delayed from the drive signal by a vibration transmission time corresponding to the distance.

The wave used in this embodiment is a plate wave, and since this is a dispersive wave, the relationship between the envelope (broken line A in the figure) and the phase (B in the figure) of the detected waveform changes with respect to the propagation distance.

Let the advancing velocity of this envelope be the group velocity vg, and the velocity of the phase be the phase velocity vp. This group and phase velocity are used to determine the coordinates. First, if we focus only on the envelope, its velocity is vg, and when a certain point, for example the peak of the envelope, is detected, the distance between the pen and the vibration sensor is
d is given by d=Vgψtg (1), where tg is the delay time. Similarly, for other vibration sensors, the coordinate position of the pen can be determined by determining the distance.

However, in order to determine more accurate coordinate values, we also pay attention to the phase.If we take a specific point in the 0 phase, for example, the delay time of the zero crossing point after passing the peak, as tp, then d=nλp+vp*tp (2) given as. Here, input p is a wavelength and n is an integer.

From formulas (1) and (2), the integer n is d-[(mag"tg-map-tp)/input p+1/81
... (3) (integer in []), where N is a real number other than O, and an appropriate numerical value is used.For example, N=
2, n can be specified if the envelope detection accuracy is within ±1/2 wavelength.

By substituting n found in equation (3) above into equation (2),
Accurately determine the distance between the pen and vibration sensor.

In order to measure the two vibration transmission times tg and tp shown in FIG. 3, the waveform detection circuit 23 can be configured as shown in FIG. 6, for example.

In FIG. 6, the output signal of the vibration sensor 27 is amplified to a predetermined level by the amplification circuit 71 described above.

The amplified signal is input to the envelope detection circuit 72, and only the envelope of the detection signal is extracted. The timing of the peak of the extracted envelope is detected by the envelope peak detection circuit 73. From the peak detection signal, an envelope delay time detection signal Tg having a predetermined waveform is formed by a signal detection circuit 74 composed of a mono-multivibrator or the like, and is input to an arithmetic control circuit l.

Further, a phase delay time detection signal Tp is formed by the detection circuit 78 from this Tg times signal timing and the original signal delayed by the delay time adjustment circuit 75, and the arithmetic control circuit 1
is input. .

That is, the Tg multiplied signal monostable multivibrator 76 converts it into a pulse of a predetermined width. Further, the hump rate level supply circuit 77 responds to this pulse timing by t.
A threshold value for detecting a p-fold signal is formed. As a result, the comparator level supply circuit 77 forms a reference signal having a level and timing as shown by the solid line in FIG.

That is, the monostable multivibrator 76 and the comparator level supply circuit 77 are used to ensure that the phase delay time measurement is only activated for a certain period of time after the envelope peak is detected.

This signal is sent to a detection circuit 7 consisting of a comparator etc.
8 and compared with the detected waveform delayed by vibration transmission as shown in FIG. 5(e), and as a result, a tp detection pulse as shown in FIG. 5(f) is formed.

The circuit shown above is for one vibration sensor 27,
The same circuit is provided for each of the other sensors. If the number of sensors is generalized to h, the envelope delay time Tgl-h and the phase delay I! J]Tpl-h, respectively, are input to the arithmetic control circuit 21.

In the arithmetic control circuit 21 of FIG. 4, the above Tgl~h, Tp
The l to h signals are input from the input port 35, and the count value of the counter 4323 is taken into the latch circuit 33 using each timing as a trigger.

As described above, since the counter 32 is started in synchronization with the driving of the vibrating pen, the latch circuit 33 receives data indicating the respective delay times of the envelope and the phase.

Here, when three vibration sensors 27 are arranged at the positions s1 to s3 at the corners of the vibration transmission plate 26 as shown in FIG. 7, the position of the vibrating pen 3 is f for the straight line from to the position of each vibration sensor 27
idl-d3 can be obtained.

Furthermore, the coordinates (X, y) of the position P of the vibrating pen 3 can be determined by the arithmetic control circuit 1 based on the straight line adl to d3 using the following formula from the 3-square theorem.

x=X/2 + (di + d2) (di −
d2) /2X −= (4)y=Y/2 +(
di ◆d3) (dl -d3) /2Y
(5) Here, x and Y are the distances along the x and Y axes between the vibration sensor 6 at the positions S2 and s3 and the sensor at the origin (position Sl).

As described above, the position coordinates of the vibrating pen 3 can be detected in real time.

Next, the control system of the entire information input/output device will be explained.

FIG. 8 is a block diagram of a coordinate input/output device according to the present invention.
Reference numeral 11 consists of the coordinate input device 81 shown in FIG. 1 and a transparent liquid crystal display 82. The coordinate input device 81 shown in FIG. As described above, the coordinate input device 81 is constructed using the liquid crystal display 821 or the glass plate on the back. Reference numeral 83 denotes a control circuit for the liquid crystal display 82, which is an LCD controller having a function of converting the coordinates of output data sent to the display 82 based on information from the front/back detection switch 13 shown in FIG.

Reference numeral 84 is a central processing unit (hereinafter referred to as CPU) that controls the entire information input/output, and performs display processing based on input coordinates and other processing. Reference numeral 85 is a ROM that stores programs such as making the CPU 84 move. Reference numeral 86 is a ROM. This is a RAM that stores information necessary for the operation of the CPU.

Reference numeral 87 indicates the arithmetic control circuit 21 in FIG. An input coordinate processing device 88 including the transducer drive circuit 22 and the waveform detection circuit 23 has display information written therein by the CPU 84;
It is a dual port VRAM whose display information is read out by an LCD controller 83.

FIG. 9 is a block diagram of the above LCD controller 83, in which reference numeral 91 is an address generation circuit, reference numeral 92 is a reference clock generation circuit for display, and reference numeral 93 is a parallel/serial conversion circuit. The serial conversion circuit 93 is used to convert the display data from front to back, that is, the parallel/serial conversion circuit 93 converts the display data from front to back when the up/down signal output from the central processing unit that instructs the data reading application is "1", that is, "up". In the state of 8
Send bit parallel data as serial data in order from MSB (most significant bit) 0 For example, if the parallel data is hexadecimal and FO, the sent data will be rll.
llooooJ, and conversely the up/down signal is "0"
, that is, when it is in the "down" state, it is transmitted in order from the LSB (least significant bit). In that case, the transmitted data will be roooollllJ.

FIG. 10 shows a block diagram of the address generation circuit 91. In this embodiment, it is assumed that the display on the liquid crystal display 82 is 512 dots horizontally and 128 dots vertically. In FIG. 10, reference numeral 101 is a counter for counting up the display lines, and since there are 128 lines, it is in 128 decimal.

Also, code 102 is a 7-up down counter in 64 decimal.
The count up is performed by the count up signal of the 64-decimal counter 102, and after counting 128 times, it returns to 0.

The up/down signal 106 is “1”, that is, “up”
When rO is synchronized with the clock of the clock generator 92,
It increments by 1 from J, and when it counts 64 times, it outputs count up number 43 103 to the 128-decimal counter 101, and repeats the same operation of returning to rQJ.

On the other hand, when the up/down signal 106 is r04, that is, "down", it is subtracted from "63" in synchronization with the clock of the clock generator 92, and when it counts 64 times, the count up signal 103 is sent to the 128-decimal counter 1.
01 and returns to "63". The output signals from both the 128-decimal and 64-decimal counters are input to the VR'AM 88 as a display data address.

FIG. 11 shows the structure of dot data displayed on the display 82. Since there are 512 dots horizontally, the first line starts from address 0OH (hexadecimal a) to 3FH in byte units, and one dot corresponds to one bit. 2
The row is from address 40H to 7FH.

FIG. 12 shows the contents written when the data shown in FIG. 11 is written to the VRAM 88 in the screen memory.

In FIG. 1 again, when the input/output device 11 is swung to the 1 side and the state on the main body 12 side is set to the normal state, the 1 front/back detection switch 13 is pressed down, and the CPU 84 is set to the normal state by the switch 13. Judging that, ROM
The up/down signal 106 is set to the "up" state by the program stored in the coordinate input device 85, and the coordinate data input from the coordinate input device is processed as is without being converted.

In the LCD controller 83, the 64-decimal counter 102 and the 128-decimal counter 101 perform addition operations, and the parallel/serial converter 93 converts the MSB of 8-bit input data to the reference clock generation circuit 92. The signal is sent to the liquid crystal display 82 in synchronization with the clock generated in . The liquid crystal display 82 displays the received data in synchronization with the clock generated by the reference clock generation circuit 92 as well.

Therefore, when the screen data as shown in FIG. 11 is displayed as is and the display device 11 is opened as shown with the side 14 as the axis, the front/back detection switch 13 is not pressed. The CPU 84 determines that it is in the inverted state, and changes the up/down signal 106 to the "down" state using the same program stored in the ROM 85. Then, if the data input from the coordinate input device is (xo, yO), then the coordinate data (X, Y) used for processing is x=512-xo-(6)-y=yo
... Perform coordinate transformation based on the formula (7).

On the other hand, the LCD controller 83 performs a "down" operation.
That is, the display data is read from the LSB side, that is, the 64-decimal counter 102 performs subtraction and the 128-decimal counter performs addition. Further, the parallel/serial converter 93 sends out the LSB of the 8-bit input data to the liquid crystal display 82 in synchronization with the clock of the reference clock generation circuit 92.

The liquid crystal display 82 similarly displays input data in synchronization with the clock generated by the reference clock generation circuit 92. Therefore, the display data when the screen memory is the same as that shown in FIG. 12 is as shown in FIG. Display is performed.

According to the above embodiment, even when the coordinate input/output device is turned over, the display and input coordinate system (data) are automatically converted without the need for troublesome switch operations. In addition to being able to visually confirm the correct display.

Therefore, just by swinging the input/output section as shown in Figure 1,
Trees, other images, etc. without tedious switch operations
Characters can be easily copied and input.

Note that although the display data is inverted in the above configuration, the input coordinate data may be directly inverted on the coordinate input device side.

A mercury switch or the like may be used as the front/back detection switch 13. In this case, the coordinate input/output device 11 provided with the mercury switch 142 can be separated from the main body 12 as shown in FIG. In FIGS. 14(A) and 14(B), mercury 141 is sealed in a tube 142 made of glass or the like. Reference numeral 143 is a lead wire, and when the entire switch is facing upward, the mercury falls down and the lead wire is turned on, and when the switch is turned in the opposite direction, it is turned off. With such a configuration, the input/output section can be completely separated from the main body, making it easier to handle when inputting copies.

In this case, the coordinate input/output device is configured as shown in FIG. In FIG. 15, reference numeral 12 is a main body, reference numeral 11 is a coordinate input section, and a front/back detection switch 142 is attached.

In the configurations shown in FIGS. 14 and 15, it is also possible to perform coordinate inversion not in the X-axis direction but in the Y-axis direction. This allows the input/output section to be used in either portrait or landscape orientation.

Yet another example is a method in which the output coordinates are inverted using software rather than hardware.

When the side light is on, the LCD controller cI-ra 83 is set to V in FIG.
The contents stored in the RAM 88 (7) are outputted from address 0 to address 80H one by one to the coordinate output device.

Even in this case, the data to be output on the screen is written to the VRAM 88 by the central processing unit 84, but if the front/back detection switch 103 causes the coordinate input/output device 101 to face the front side, as shown in FIG. Then, the coordinates are converted so that the coordinates (0°0) to (7, O) on the display screen correspond to the OH of the address, and the display bits (0, 0) correspond to the MSB, i.e. ,
The display coordinates are associated with the memory address as shown in the following formula, and the contents are written into the VRAM 88.

ADRS= (128・y+x)￥8・(8)B
IT=(128-y+x)MOD8-...C9) Here, ADR5 is address data, BIT is display bit data, and α\β is the quotient of α÷β as in computer languages such as BASIC, αMODβ is α÷β
This is a function that calculates the remainder of .

On the other hand, the data to be displayed is the above equation (8).

(9) is displayed, and the input coordinates from the coordinate input device are processed as they are without being converted.

Now, when the coordinate input/output device is reversed, the central processing unit 84 uses the front/back detection switch 103 to determine that it is the back side, and the data to be written to the VRAM 88 must be reversed only in the X-axis direction, as shown in FIG. This is done by calculating the memory address for the display position using the formula shown below and writing the display content to that address on the VRAM.

ADRS O84 ((128・y+ri￥512)+83-
((428-y MOD512) 18 ・(1
0) BIT-7-((12B・y÷z)MOD512)
MOD8... (11) Also, the data input from the coordinate input device 81 is converted into (x
When the data used for processing is (x, y), conversion is performed based on formulas M(10) and (11), and processing is performed.

x = 512-x O---(12)y=yo
...(13) Through the above processing, even when the coordinate input/output device is turned over, the same as above,
Input and output can be performed in the same state as on the front side.

[Effects of the Invention] As is clear from the above, according to the present invention, information input/output is achieved by laminating and mounting a display means that is visible from both the front and back sides, and a transparent coordinate input means that can be input from both the front and back sides. and a means for detecting which side of the information input/output means is used for display or coordinate input, and input/output by the display means or coordinate input means according to the output of the detection means. The data is inverted so that display and coordinate input can be performed from either the front or back side of the information input/output means, so when information is input/output from either the front or back side of the information input/output means. However, appropriate input/output information can be reversed, and therefore, information can be freely input/output using both sides of the information input/output means without the need for troublesome switch operations. Therefore, even when tracing and copying information from a picture, photograph, tree, etc., there is an excellent effect that the input information will not be turned over.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the overall configuration of the information input/output device according to the present invention, Figure 2 is a block diagram showing the configuration of the coordinate input system, and Figure 3 is the vibrating pen and vibration sensor shown in Figure 2. FIG. 6 is a block diagram showing the configuration of the waveform detection circuit in FIG. 2, and FIG.
8 is an explanatory diagram showing the arrangement of vibration sensors, FIG. 8 is a block diagram of the entire control system of the information input/output device according to the present invention, and FIG.
Figures 10 and 10 are block diagrams showing the structure of the display control unit, Figures 11 to 13 are explanatory diagrams showing display data processing, and Figures 14 (A) and CB) are mercury switches and front/back detection switches. FIG. 15 is an explanatory diagram showing the state in which the coordinate input/output section is removed, and FIGS. 16 and 17 are explanatory diagrams showing the case where coordinate inversion is performed by software. 13... Front and back detection switch 20... Vibrating pen 21... Arithmetic control circuit 24...
- Vibrator 26...Vibration transmission plate 27...Vibration sensor 35.36...Input port door 1...Preamplifier 72...Envelope detection circuit 82...Display device display hook 1" number circle Company's Pronov a 10 Figure 1 # 艮Swikke 1j) Bowl Enemy Division Sufu 7 Go no Kieri Seal ■ 1st
In Figure 4 A, group 11 horizontal 8 and each investigator are shown.

Claims (1)

[Claims] An information input/output means in which a display means that is visible from both the front and back sides, a transparent coordinate input means that can be input from both the front and back sides are laminated and integrated, and either the front or back side of the information input/output means can be used for display or coordinate input. A means for detecting whether the data is being used is provided, and according to the output of the detecting means, the data input/output by the display means or the coordinate input means is inverted so that the data can be displayed and the coordinates can be displayed from either the front or the back of the information input/output means. An information input/output device characterized in that it is configured to perform input.