JPH0784555A - Information processor - Google Patents

Abstract

PURPOSE:To secure the secrecy in an optical information selection device by transmitting a beam when real information is displayed on a display and shielding the beam when the false information obtained by converting the real information is displayed. CONSTITUTION:By an information conversion circuit 21, the character code data supplied from a regular text memory 3 to a CG 7 are inputted, and the information performing plural kinds of conversion to the data are outputted to the CG 7, and plural kinds of conversion are switched at a fixed period or an undecided period time sequentially based on a switching signal of a random signal generation circuit 11. By shutter glasses 15, the transmission and the shielding of the beam is switched selectively corresponding to the switch of the conversion when the information by the specific conversion is displayed on a CRT 17 and when the information by other conversion is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a computer, etc.
The present invention relates to an information processing device capable of displaying information.

[0002]

2. Description of the Related Art Conventionally, as an information processing apparatus capable of performing processing accompanied by display of information requiring confidentiality in an open environment without using a dedicated room or a shield, An information processing device disclosed in Japanese Patent Laid-Open No. 3-6974 is known. FIG. 6 shows a block diagram of a character terminal which is a typical configuration example of this device.

In FIG. 6, two character generators (CGs), which normally require only one, are prepared, and an output from the true CG 5 and a false CG for the same character code input.
The output from 6 is time-divisionally switched by the switching circuit 19 synchronized with the signal of the random signal generation circuit 11 and output to the CRT 17. The output from the true CG5 is CR
The true information is displayed when it is sent to T17, and the false information is displayed when the output from the false CG6 is sent to the CRT17.

For this reason, in the case where the screen of the CRT 17 is directly viewed, the true information and the false information appear to overlap each other, so that the true information cannot be discriminated. However, at the same time, in synchronism with the signal of the same random signal generating circuit 11, when the true information is displayed on the CRT 17 by the liquid crystal, it becomes transparent,
When the false information is displayed on the CRT 17, only the true information is visible to the person wearing the shutter glasses 15 that switch to the shielding due to the afterimage effect. Therefore, even if a third party is nearby, it is possible to perform processing involving the display of information that requires confidentiality.

Further, among the embodiments of the information processing device disclosed in Japanese Patent Laid-Open No. 3-6974, a device for outputting fixed pattern information is also proposed as a device for outputting false information.

[0006]

However, according to the information processing apparatus disclosed in Japanese Patent Application Laid-Open No. 3-6974, as is apparent from the embodiment of FIG. 6, two pieces of information, true and false, are switched and output. In order to do so, it is necessary to prepare two core parts of the same scale, which makes the price higher than a device that outputs only true information, and also requires a large mounting area for the parts and thus a device. There was a flaw.

In the embodiment shown in FIG. 6, it is necessary to prepare twice as many CGs as usual as the two generating means. Further, when using two text memories as the two generating means, twice as many text memories as usual are required. CG,
The text memory is a core part of the character terminal, and the fact that they are required twice as much as usual is neglected especially in the kanji display device which requires a large capacity CG and text memory as compared with the alphanumeric display device. It is a problem that cannot be done.

Further, it is technically possible to switch and output three or more kinds of information, but this has the drawback that it is more difficult because it requires three times as many core parts as usual. It was

The device for outputting fixed pattern information as a device for outputting false information is certainly different from the example of FIG. 6 in that the core means is the same one as usual, and a simple fixed pattern generating circuit is used. Just add it. However, in this case, even if the true information changes, the screen displayed as the false information is always the same, so that the cathode ray continues to hit a specific position on the fluorescent screen of the CRT, and thus the fluorescent screen of the CRT. However, it has the drawback of accelerating the burn-in and shortening the life.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide an information processing apparatus capable of ensuring the confidentiality of display information on a screen at low cost. .

[0011]

To achieve this object, an information processing apparatus according to the present invention is an information processing apparatus having a function of displaying information on a display, and generates data corresponding to the information to be displayed. A conversion means that is provided between the data generation source and the display, and that outputs the data that has been input with the data and that has been subjected to a plurality of types of conversion including equivalent conversion, and a plurality of types of the conversion means. Switching means for time-divisionally switching the conversion in a fixed cycle or indefinite cycle, and when the display is displaying information based on the data of the equivalent conversion in correspondence with the switching of the switching means, It is characterized by further comprising an optical information selection device for selectively switching between transmission and blocking of light when displaying information based on the converted data.

[0012]

In the information processing apparatus of the present invention having the above-mentioned configuration, the conversion means performs a plurality of conversions including the equivalent conversion on the input data. The switching unit switches a plurality of types of conversion of the conversion unit in a time-divisional manner with a constant cycle or an indefinite cycle. The display displays information based on the data from the converting means. The optical information selection device selectively transmits or shields light depending on whether the display is displaying information based on the equivalent conversion data or when displaying information based on other conversion data. Switch.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

First, FIG. 1 is a block diagram showing the configuration of an information processing apparatus which is an embodiment of the present invention. The information processing device has a display device and an optical information selection device.

The display device comprises a cathode ray tube controller (hereinafter referred to as "CRTC") 1, a text memory 3 and
A character generator 7, a parallel / serial conversion circuit 9, a random signal generation circuit 11 as a switching unit, an information conversion circuit 21 as a conversion unit, a box 13 for housing these, a cathode ray tube as a display (hereinafter , "CRT").

Shutter glasses 15 are used as the optical information selection device.

The CRTC 1 is connected to the text memory 3 and the character generator 7. The text memory 3 is connected to the information conversion circuit 21. The information conversion circuit 21 is connected to the character generator 7. The character generator 7 is connected to the parallel / serial conversion circuit 9. Random signal generator 1
1 is connected to the information conversion circuit 21. CRT17
Are connected to the parallel / serial conversion circuit 9.
The shutter glasses 15 are connected to the random signal generation circuit 11. The information processing device is configured in this way.

Next, the operation will be described.

An operator inputs a keyboard input device (not shown)
Is operated to send a read signal of character information to the CRTC 1. The CRTC 1 continues the process of sequentially reading the content of the character information to be displayed on the screen stored in the text memory 3. In the text memory 3, for example, secret text is encoded and stored as character information having secrecy. The text memory 3 sequentially outputs the coded character information at the address specified by the CRTC 1,
The character code is given to the information conversion circuit 21. The information conversion circuit 21 applies conversion to the character code according to the output of the random signal generation circuit 11 and supplies the converted character code to a character generator (hereinafter referred to as “CG”) 7.

The CG 7 outputs a character font corresponding to the given conversion character code according to the clock of the CRTC 1. The output of CG7 is 8 bits, 6 bits, 24
Parallel output according to the size of the character font to be displayed, such as bits. This parallel output is a parallel / serial conversion circuit 9 (hereinafter referred to as “P / S conversion circuit”).
As a result, it becomes a bit serial signal. This bit-serial signal is output from the box body 13 to the CRT 17, and C
The character information is displayed on the RT17 screen.

FIG. 3 is a logic circuit diagram showing a first configuration example of the information conversion circuit 21. The information conversion circuit 21 includes a logical operation circuit 21a, a switching circuit 21b, and a storage circuit 21c. The character code given from the text memory 3 is used as an input code, and the information given from the storage circuit 21c is used as a conversion key code. The output code which is the result of the logical operation of the input code and the conversion key code is given to the CG 7. The conversion key code is stored in the storage circuit 21c as a special command from the keyboard input device (not shown) by the operator.
Can be set / changed arbitrarily by writing in. Equivalent conversion (no conversion) and exclusive OR (X
OR) and are used. The number of bits of the character code per character is 8.

The input code is given to A (a7-a0), the conversion key code is given to B (b7-b0), and the output code appears to C (c7-c0). SEL is an output switching signal. As is clear from FIG. 3, SEL =
When 0, the output code C becomes equal to A, and SEL =
When it is 1, the output code C becomes equal to the result of the exclusive OR of the input code A and the conversion key code B.

FIG. 4 is a diagram showing an example of conversion by the exclusive OR of character codes by the information conversion circuit 21 of FIG.
It is assumed that 0f is given in hexadecimal as the conversion key code. At this time, for example, when 42 or "B" in hexadecimal is given as the input character code, the converted character code to be output is 4d in hexadecimal, that is, "M". This is the logical operation "42 XOR 0f = 4
Equivalent to doing d ". Similarly, when the character codes of the character string “BROTHER” consisting of 7 characters are sequentially input, the character codes of the character string “M] @ [GJ]” are sequentially output as converted character codes. Since the CG 7 supplies the bit pattern corresponding to this conversion character code to the P / S converter 9, at the place where "BROTHER" should be displayed on the CRT 17, at this time, the fake character "M" @ [GJ] "is displayed. The information will be displayed.

In the example of FIG. 3, the conversion key code is arbitrarily set by the operator by a command, but the information processing apparatus automatically sets it by a random function, whether it is a fixed type or a semi-fixed type such as a switch. Whatever is applicable, such as the one that gives a value for generating an output code different from the input code of the logical operation to the logical operation circuit 21a. As the logical operation, as long as it gives an output code different from the input code, binary operation such as logical sum, logical product, and arithmetic sum, and unary operation such as logical negation and shift may be used in addition to exclusive OR. . Although not a logical operation, some bits in the code may be exchanged.

In the present embodiment, all the 8-bit character codes are converted by the information conversion circuit 21, but for example, the upper 4 bits are directly connected to the upper 4 bits of the input of the CG 7 from the text memory 3 and the lower It is also possible to convert only 4 bits by the 4-bit information conversion circuit 21 and connect this 4-bit output code to the lower 4 bits of the input of the CG 7 so that only some of the bits are converted. Converting some of the bits requires a smaller number of gates in the information conversion circuit 21 and is lower in cost. Moreover, even if only some bits are converted, the encryption is sufficiently possible. Also in the example of FIG. 4, the upper 4 bits are not substantially converted.

The random signal generation circuit 11 includes a CRT 17
A binary counter that uses the vertical synchronization signal output to the clock input as a clock is used. The 1-bit output of the counter serves as a switching signal.

For example, when a 60 Hz signal is used as the vertical synchronizing signal, the switching signal output from the binary counter is output to the information conversion circuit 21 about every 16 ms. As a result, the information conversion circuit 21 alternately switches between the true code and the false conversion code for output every 16 ms.

The random signal generating circuit 11 is suitable for switching between true information and false information, such as a binary counter, an n-ary counter, a random function generating circuit, and a ROM storing random data. Any signal may be used as long as the signal changes at a constant cycle or indefinite cycle. In addition, the random signal generation circuit 1
The timing of the signal generated by 1 may be changeable by the operator.

In the example of FIG. 3, there is only one type of calculation for converting into false information, but it is also possible to switch between two or more types. FIG. 5 shows an information conversion circuit 2 for switching and displaying a total of three types of information, that is, true information and two types of false information.
2 is a second configuration example of 1. The logic operation circuit 21a and the logic operation circuit 21d generate two different types of false codes, and the selection circuit 21b switches three types of codes including these and the true codes. In this case, the SEL signal is 2
Since it is composed of bits, a ternary counter is used for the random signal generating circuit 11 so as to generate three kinds of switching signals. The shutter glasses 15 are set so as to be transparent when the switching signal has a specific pattern out of the three patterns, and to be shielded at other times.

Further, in the example of FIG. 3, B (b7-b0)
The conversion key code input to is the random signal generation circuit 1
Although it is constant with respect to the change of the signal of 1, the conversion key code may be switched corresponding to the signal of the random signal generating circuit 11 to convert the character code. In this case, the same code as the input code is output when B = 0. Therefore, the shutter glasses 15 may be set to be transparent only when B = 0.

When the cycle of this signal is set to a cycle of a certain frequency or more determined by human visual ability, the true character and the false character appear to overlap each other on the screen of the CRT 17 due to the afterimage effect. That is, in the example of FIG.
The true character string "BROTHER" and "M] @ [G
The false character strings "J]" will appear to overlap. Therefore, it is extremely difficult for a person who directly views the screen of the CRT 17 to understand the correct content of the character information stored in the text memory 3. If the information conversion circuit of FIG. 5 is used, three types of characters will overlap,
It becomes more difficult to understand the character information.

The shutter glasses 15 have a structure in which a thin liquid crystal is sandwiched between a transparent electrode and a cover glass, and the liquid crystal emits light when an electric field is not applied to the transparent electrode and when an electric field is applied to the transparent electrode. It has the effect of either transmitting or blocking. In this example, a liquid crystal that shields light when an electric field is applied is used.

The shutter glasses 15 allow the light from the screen of the CRT 17 to be transmitted or blocked according to the cycle of the signal output from the random signal generation circuit 11. The output from the random signal generation circuit 11 is
The information conversion circuit 21 is designated to output a true character code, and the electric field is not applied to the shutter glasses 15,
The information conversion circuit 21 specifies to output a false character code and applies an electric field to the shutter glasses 15. Therefore, through the shutter glasses 15, the CRT 1
A person who views the screen 7 can select and extract only the true character information.

As described above, only the person wearing the shutter glasses 15 can understand the content of the confidential character information, and those in the surroundings cannot perceive the confidential information, and at a high level. The confidentiality of information can be secured.

Although the information conversion circuit 21 is inserted and connected between the text memory 3 and the CG 7 in FIG. 1, it is shown in FIG. 2 if it is in a path through which information that changes the display result flows. It may be inserted at any position such as A / I / U / E. In FIG. 2, the location marked a is the insertion location in the example of FIG. If you insert it in the place of a, the display position of the character on the screen changes. If it is inserted in the position of B, the displayed character changes as described in FIG. If it is inserted at the position of c, the position of the bit pattern in each display character changes line by line. If it is inserted at point d, the bit pattern in each line of the displayed character changes bit by bit. The information conversion circuit 21 may be simultaneously inserted in a plurality of locations of A / I / U / E. Further, in any case, as described with reference to FIG. 3, the bits may be inserted only in partial bits instead of in all bits.

Although this embodiment has been described on the assumption of a character terminal for displaying only character information, it can be applied to a graphic terminal for displaying only graphic information or both graphic information and character information. good.

The information processing apparatus shown in this embodiment is obtained by adding a slight amount of information conversion circuit circuit 21 to a normal display apparatus. The method of generating false information by adding the information conversion circuit 21 has an advantage that it can be realized at a considerably lower cost and more compactly than the method of preparing the false CG 6 and the false text memory. This advantage is remarkable when the conversion is applied to only partial bits. Further, since the false display information changes at the same time as the true display information changes, there is an advantage that the risk of causing the burn-in of the CRT 17 is less than that of using a fixed pattern as the false display information.

[0038]

As is apparent from the above description, the use of the information processing apparatus of the present invention requires confidentiality even in an open environment without using a dedicated room or a shield. It becomes possible to perform processing involving the display of information that is considered to be.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an information processing apparatus according to an embodiment of the present invention.

2 is a block diagram of an information conversion circuit in the information processing apparatus of FIG.
It is a block diagram which shows the arrangement possible position.

FIG. 3 is a logic circuit diagram showing a first configuration example of an information conversion circuit.

4 is an explanatory diagram showing an example of conversion of information by the information conversion circuit of FIG.

FIG. 5 is a block diagram showing a second configuration example of the information conversion circuit.

FIG. 6 is a block diagram showing a configuration of a conventional information processing device.

[Explanation of symbols]

 1 CRT controller (CRTC) 3 Text memory 7 Character generator (CG) 9 Parallel / serial conversion circuit 11 Random signal generation circuit 15 Shutter glasses 17 CRT 21 Information conversion circuit

Claims (1)

[Claims] 1. An information processing apparatus having a function of displaying information on a display, provided between a data source for generating data corresponding to information to be displayed and the display, and receiving the data as input. A conversion unit capable of outputting data that has been subjected to a plurality of types of conversion including equivalent conversion, a switching unit for time-divisionally switching the plurality of types of conversion of the conversion unit in a fixed cycle or indefinite cycle, and the switching unit Corresponding to the switching of, when the display is displaying the information based on the data of the equivalent conversion, and when displaying the information based on the other conversion data other than the selective transmission of light. An information processing apparatus, comprising: an optical information selection device that switches between shielding and light.