CN1333317C

CN1333317C - Privacy device

Info

Publication number: CN1333317C
Application number: CNB200510065027XA
Authority: CN
Inventors: 许世法
Original assignee: Mitac International Corp
Current assignee: Mitac International Corp
Priority date: 2003-02-13
Filing date: 2003-02-13
Publication date: 2007-08-22
Anticipated expiration: 2023-02-13
Also published as: CN1690912A

Abstract

The present invention relates to a privacy device which is suitable for protecting the data displayed on a display device connected to a host machine of a desktop computer from peeping. The display device comprises a scalable circuit, and an output interface is arranged in the scalable circuit to output a plurality of tricolor digital signals, wherein when the tricolor digital signals are output from the output interface, an output voltage needs to be supplied to the output interface. The privacy device comprises a privacy composite key which is composed of at least two function keys and can produce a plurality of first pulse signals under an actuated state, and a microprocessor which is connected to the output interface and comprises a first logical operation gate, wherein the first logical operation gate is connected with the privacy composite key to receive the first pulse signals and to generate a starting control signal. The starting control signal causes the output voltage to be not capable of providing the needed voltage when the tricolor digital signals are output from the output interface.

Description

Privacy device

Technical field

The invention relates to a kind of privacy device and method, and particularly avoid the privacy device and the method for being spied on relevant for data shown on a kind of protection and the display device that the desktop computer main frame is connected.

Background technology

Because everyone all has secret not want to watch to other people, be with, how in the PC product, to strengthen function of keeping secret and be a special kind of skill of in society now, quite paying attention to.

And when someone after some data of input is to its PC, because of some reason must be left a little while but can return very soon the time, he does not want shut down of computer, because can spend one section long time like this to wait for computer start again once more, be with as why not allow whole shut down of computer can prevent leaking of data again, promptly be on confidential data, to need the part strengthened.

And present technology is to allow PC enter in the sleep pattern, as long as but anyone touches the arbitrary key of keyboard, even move mouse, can reply normal use pattern.

And in the operating system of WINDOWS; can allow the user be set in to be separated by behind the unused state waiting time how long to enter the screen protection pattern; and can allow the user set the password that enters normal use pattern once more; even make others touch arbitrary key of keyboard or rolling mouse; all can't peep the data of user's input easily; but because how long the user just enters the screen protection pattern after setting unused state; be with in also not entering the screen protection pattern time; others still can utilize this neutral gear to peep important information; and as long as by arbitrary key or touch mouse and can allow the unlikely screen protection pattern that enters of computer; but perhaps the user also can set the stand-by period that minimum enters the screen protection pattern; but also need just can leave the table after this minimum waiting time in the first-class time in seat; and behind return, also need to set once more to enter the stand-by period of screen protection pattern; otherwise at work; as long as ponder a bit of time, will enter the screen protection pattern, cause the inconvenience in the use.

Summary of the invention

In view of this; the objective of the invention is to propose a kind of privacy device; can be before the user leaves the table; immediately enter confidential state; make other people can't be by touching mouse or keyboard enters normal operating condition; simultaneously, the present invention is applicable to that data shown on protection and the display device that the desktop computer main frame is connected avoids being spied on.

A kind of privacy device of the present invention; be applicable to that data shown on protection and the display device that a desktop computer main frame is connected avoids being spied on; most function keys and a display screen are arranged on this display device surface; wherein each function key all has corresponding function; this display device comprises a video signal pre-amplifier; in order to most three primary colors simulating signals are carried out the signal processing and amplifying, it is characterized in that this privacy device comprises:

One secret compound keys is made up of two those function keys at least, is being activated under the state, can produce corresponding a plurality of first pulse signal respectively; And

One microprocessor connects this video signal pre-amplifier, produces a start-up control signal in order to receive an above-mentioned a plurality of arteries and veins towards letter And;

Wherein, this start-up control signal is interception one a clamp pulse signal, makes this clamp pulse signal can't transfer to this video signal pre-amplifier, and this video signal pre-amplifier can't be output in those three primary colors simulating signals after the processing and amplifying on this display screen.

Wherein this display device is a cathode-ray tube TV.

Comprise also that wherein one discharges compound keys, form by two above-mentioned functions keys at least, be activated under the state, form each function key that discharges compound keys and produce one second pulse signal respectively.

Wherein this microprocessor comprise one first with Men Yuyi second and door, connect this secret compound keys and this release compound keys respectively, wherein this first receives above-mentioned a plurality of first pulse signals and produces a start-up control signal with door, and this second Sheffer stroke gate then receives above-mentioned a plurality of second pulse signal and produces a release control signal.

Wherein this release control signal discharges this clamp pulse signal, makes this clamp pulse signal input to this video signal pre-amplifier.

Wherein, be the identical functions key in order to form the above-mentioned partial function key of this secret compound keys and this release compound keys.

Wherein being combined into above-mentioned a plurality of function keys of this secret compound keys and this release compound keys, is diverse function key.

Wherein this microprocessor is a firmware in devices.

Comprehensively above-mentioned, the present invention is the secret compound keys that the function key of utilizing several scripts to be positioned at the display device surface is formed as can be known, make the handled data of signal processor can't be output in computer screen, to reach instant function of maintaining secrecy, and, be to be cracked being difficult for because the release compound keys formed is that function key is formed in the mode just like password as the permutation and combination.

Description of drawings

For above-mentioned and other purposes of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below, wherein:

What Fig. 1 illustrated is a calcspar that the present invention is directed to a preferred embodiment of the privacy device in the LCD monitor;

What Fig. 2 illustrated is according to the circuit diagram of Fig. 1 at the designed negater circuit of output voltage;

What Fig. 3 illustrated is a calcspar that the present invention is directed to another preferred embodiment of the privacy device in the CRT monitor;

Fig. 4 illustrates is a circuit diagram at function key among Fig. 1 and Fig. 3 and microprocessor internal design; And

What Fig. 5 illustrated is the present invention's time slot scrambling process flow diagram of a preferred embodiment again.

Embodiment

Please refer to Fig. 1, it illustrates is a kind of privacy device according to a preferred embodiment of the present invention, be applicable to that data shown on protection and the display device that desktop computer main frame (not drawing) is connected avoids being spied on, wherein display device can be iconoscope (Cathode Ray Tube; Be called for short CRT) monitor or LCD monitor (Liquid Crystal Display; Be called for short LCD).

General display device is lip-deep to be included and be revealed in: several function keys (100a, 100b, 100c, 100d, 100e and 100f) and display screen (CRT display screen or LCD display curtain), wherein each function key can be reached corresponding function separately, has menu (menu) function, selection (select) function, adds, subtracts function and start (poweron) function etc.

Wherein, what privacy device was controlled partly is an output voltage that puts on the output interface 110 of scalable circuit 106 among Fig. 1, because general image data all can resolve into R, G, the B three primary colors, also formed with the data that is sent to LCD display curtain 112 by these three primary colors, but because data is when generating, be to form with analog signal form, and the LCD display curtain is the demonstration material of a display digit data, be earlier through analog/digital converter 104 with necessary, the three primary colors analog signal conversion is become the three primary colors digital signal, but because handled data, its resolution may be the image of 800*600, and the employed LCD display curtain 112 of user may be 15 cun a screen, just the resolution of its screen is 1024*768, it is image not to be the former 1024*768 of being resolution, all need see through a scalable circuit 106 and rearrange the resolution of adjusting its image, make it to be covered with whole screen with point-to-point form, just the image that resolution is 800*600 needs to amplify adjustment through the ratio of scalable circuit 106 and just can be output on the LCD display curtain 112.

In scalable circuit 106, comprise two main elements, be respectively signal processor 108 and output interface 110, wherein, signal processor 108 promptly is that the digital image data D1 that will be imported from analog/digital converter 104 carries out the processor that ratio is amplified or ratio is dwindled, and output interface 110 then is that the three primary colors numerical data D2 after signal processor 108 is handled exports LCD display curtain 112 to.Wherein, signal processor 108 need be supplied to a core voltage (core voltage), and output interface 110 also needs output voltages (output voltage) make it to carry out output action amplifying or ratio when handling when carrying out output action.

And privacy device proposed by the invention promptly is that an output voltage of the output interface 110 that puts on scalable circuit 106 is controlled, and comprises in privacy device: secret compound keys and microprocessor 102.

Wherein, secret compound keys, at least formed by two function keys on the panel shown in Figure 1 100, be activated under the state, can producing corresponding first pulse signal, and because microprocessor 102 is firmware in devices, be by which function key to form defining secret compound keys by program, though and form the function key of secret compound keys, and formed or function key inequality is formed fully by part identical functions key, all can transfer to microprocessor and detect.

Microprocessor 102, be to connect output interface 110, in microprocessor 102, comprise and logical operation lock (AND gate) (subsequent detailed it), wherein in the present embodiment, be to connect secret compound keys, reach with several first pulse signals of common reception and produce a start-up control signal by several first pulse signals that received with ANDgate.

Wherein, the start-up control signal is to make output voltage that output interface 110 required voltage when output three primary colors digital signal can't be provided, then the output interface 110 numerical data D2 that signal processor 107 can't be handled is sent to LCD display curtain 112, so far can reach function of keeping secret of the present invention, data can't be transferred on the display screen.

But after making numerical data D2 can't be sent to LCD display curtain 112,, during the preceding work desiring to carry out once more, can utilize one to discharge compound keys, make numerical data D2 can be sent to LCD display curtain 112 once more if after the user gets back to own seat.

Comprise also in privacy device that wherein this discharges compound keys, this compound keys at least also is made up of two function keys, be activated under the state, can produce several corresponding second pulse signals respectively, and also comprise a non-and logical operation lock (NAND gate) (subsequent detailed it) at microprocessor 102, be to connect this to discharge compound keys, to receive several second pulse signals and to produce a release control signal via several second pulse signals that receive, this release control signal is output voltage to be provided once more give output interface 110, for output interface 110 being exported to three primary colors digital signal D2 on the LCD display curtain 112 once more to show for enough voltage.

Certainly, make up this function key that discharges compound keys and also can define by the program in the microprocessor 102, no matter and the release compound keys is made up of part identical functions key or function key inequality is formed fully, and all can transfer to microprocessor and detect.

In the present embodiment, there are two kinds to make output voltage that the method for giving output interface 110 can't be provided about the start-up control signal.

First method is, via the input pin 109 that on output interface 110, has to allow output voltage import specially, the start-up control signal that utilizes microprocessor 102 to produce, directly close input pin 109, make output voltage can't input to output interface 110, and when desiring to make output voltage input to output interface 110 again, the release control signal that then utilizes microprocessor 102 to produce, control input pin 109 is opened once more.

Second method is, supposing does not have this independent pin (promptly importing pin 109) on output interface 110, then can be as shown in Figure 2, utilize a negater circuit 200 to drag down output voltage, in this negater circuit 200, comprise two transistors, be respectively 201 and 206, all comprise base stage B, collection utmost point C and emitter-base bandgap grading E, wherein the base stage B of transistor 201 connects microprocessor 102, emitter-base bandgap grading E connects an earthing power supply, and collection utmost point C sees through resistance 180 to connect output voltage, and the base stage B of transistor 206 is the collection utmost point C that connect transistor 201, collection utmost point C connects output voltage, and emitter-base bandgap grading E connects output interface 110.

Suppose that the start-up control signal is to be a logic high (logichigh) signal after a series of logical operation of process, then ought be transferred to the base stage B of the transistor 201 of negater circuit 200, behind conducting collection utmost point C and the emitter-base bandgap grading E, the ground voltage that the turn-on voltage that base stage B connected of transistor 206 can be connected because of the emitter-base bandgap grading E of transistor 201 drags down its magnitude of voltage, cause the output voltage of the collection utmost point C of transistor 206 can't conducting to emitter-base bandgap grading E end, and then output voltage can't be transferred to output interface 110.And when desiring to make output voltage input to output interface 110 again, the release control signal that then utilizes microprocessor 102 to produce makes output voltage export output interface 110 to once more.

Can reach function of keeping secret of the present invention thus, just see through one group of secret compound keys that the function key be arranged in the LCD monitor surface forms and close or drag down the required output voltage of output interface 110, make the three primary colors digital signal can't export LCD display curtain 112 to.And in the time will making the three primary colors digital signal export LCD display curtain 112 to once more, still need rely on to be positioned on the LCD monitor surface several and to be defined as the release compound keys of release function by microprocessor.And owing to form to discharge the function key of compound keys and formed in the mode just like password as the permutation and combination, be to be cracked being difficult for.

Please refer to Fig. 3, it illustrates is a kind of privacy device according to another preferred embodiment of the present invention, comprising secret compound keys and microprocessor 102.

Connection relationship and function between wherein secret compound keys and the microprocessor 102 all in above-mentioned explanation, are not give unnecessary details not add at this, and its inner combination of circuits is then introduced in detail in the back extended meeting.

Wherein, in CRT monitor 310, comprise video signal pre-amplifier 306 and post-amplifier 308, video signal pre-amplifier 306 wherein, be in order to several three primary colors (R, G, B) simulating signal is carried out the signal processing and amplifying, and the microprocessor 102 in the privacy device of the present invention, it then is the start-up control signal intercept video signal pre-amplifier 306 that utilize to produce required clamp pulse signal when carrying out the signal processing and amplifying, promptly be to make start-up control signal controlling one on-off circuit 304, make the clamp pulse signal can't transfer to video signal pre-amplifier 306, and video signal pre-amplifier 306 promptly can't be output in the three primary colors simulating signal after the processing and amplifying on the display screen.

Please refer to Fig. 4, what it illustrated promptly is in Fig. 1 and Fig. 3, is included in the main element in the privacy device---secret compound keys, release compound keys and microprocessor 102.

In the present embodiment, microprocessor 102 is that the secret compound keys of definition is made up of function key 100d, 100e and 100f, is made up of function key 100a, 100b and 100c and discharge compound keys.When function key 100d, 100e and 100f are activated simultaneously,, be can produce common effect input end (the General Purpose Input that corresponding low pulse signal is passed to microprocessor 102 respectively owing to be to be in ground state; Be called for short GPI) 404d, 404e and 404f, again respectively behind the reverse operating via reverser 406d, 406e and 406f, input to and logical operation lock (AND gate) 408 to carry out the logical operation of AND, and then produce the start-up control signal of a logic high, see through common effect output terminal (General Purpose Output afterwards again; Be called for short GPO) 412a output.

In addition, in the present embodiment, microprocessor 102 is that definition release compound keys is by function key 100a, 100b and 100c form, because function key 100a, 100b and 100c are to be in ground state when being activated simultaneously, be can produce the GPI404a that low pulse signal is passed to microprocessor 102 respectively, 404b and 404c, again respectively via reverser 406a, behind the reverse operating of 406b and 406c, input to non-and logical operation lock (NAND gate) 410 to carry out the logical operation of NAND, and then produce the release control signal of a logic low, see through GPO 412b again and export this release control signal.

The pulse signal that above-mentioned secret compound keys and release compound keys are produced under the startup situation, in the present embodiment, though be to be designed to low pulse signal, but visual circuit be designed to low pulse signal or high pulse signal, and the start-up control signal of institute's output and release control signal also can be logic high signal and logic low signal because of the difference of circuit design.

Above-mentioned circuit design be because of function key at the beginning all be to connect a positive voltage, be to be to connect a ground voltage when being activated, can be designed to, make that the pulse signal that is transmitted is a low pulse signal, and then before being carried out logical operation, also need carry out reverse process, but also can being designed at the beginning, function key all is to connect a ground voltage, and be to be designed to connect a positive voltage when being activated, make that the pulse signal that is transmitted is a high pulse signal, cause before carrying out logical operation, need not carry out reverse process, the cost of saving the design of reverser electronic component and making.

Please refer to Fig. 5; it illustrates is according to the present invention's a kind of time slot scrambling of a preferred embodiment again; be applicable to that data shown on protection and the display device that the desktop computer main frame is connected avoids being spied on; wherein; be revealed in lip-deep several function keys and the display screen of including of display device, wherein each function key can be reached corresponding function separately.

This time slot scrambling comprises: step 500, whether detect secret compound keys is activated, wherein secret compound keys as mentioned above, formed by at least two function keys, if detecting secret compound keys is activated, then in step s502, produce a start-up control signal, make a signal processor signal after handling can't be output on the screen, no matter this signal is analog or digital signal (step s504).But if detecting secret compound keys is not activated, then still keeps display screen and keep the normal operation pattern, data can be shown in (step s510) on the display screen.

After the startup compound keys is activated, make signal processor the signal after handling can't be output on the screen, though reached data function of keeping secret (because the data that do not have on the screen shows), when the user desires to be returned to the normal operation pattern, further step must be arranged, comprising:

Also be activated (step s506) if detect a release compound keys of forming by at least two function keys, then produce a release control signal (step s507), signal processor can be output in the signal after handling on the screen once more, make display screen once more in a normal operation pattern (step s510).

In sum, advantage of the present invention can make the data (no matter being the analog or digital data) after processed can't be output in computer screen (no matter being CRT or the display screen of LCD) at once, to reach instant function of maintaining secrecy, and because the release compound keys of being formed is that function key is formed in the mode just like password as the permutation and combination, be to be cracked by other people with difficult, simultaneously, though output data by pin, making on the screen can't display data, but once after discharging compound keys and being activated, still can immediately data be shown on the display screen.

Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this operator, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is when looking being as the criterion that accompanying Claim defines.

Claims

1, a kind of privacy device; be applicable to that data shown on protection and the display device that a desktop computer main frame is connected avoids being spied on; most function keys and a display screen are arranged on this display device surface; wherein each function key all has corresponding function; this display device comprises a video signal pre-amplifier; in order to most three primary colors simulating signals are carried out the signal processing and amplifying, it is characterized in that this privacy device comprises:

One microprocessor connects this video signal pre-amplifier, in order to receive above-mentioned a plurality of first pulse signal and to produce a start-up control signal;

2, privacy device as claimed in claim 1 is characterized in that, wherein this display device is a cathode-ray tube TV.

3, privacy device as claimed in claim 1 is characterized in that, comprises also that wherein one discharges compound keys, is made up of two above-mentioned functions keys at least, is being activated under the state, forms each function key that discharges compound keys and produces one second pulse signal respectively.

4, privacy device as claimed in claim 3, it is characterized in that, wherein this microprocessor comprise one first with Men Yuyi second Sheffer stroke gate, connect this secret compound keys and this release compound keys respectively, wherein this first receives above-mentioned a plurality of first pulse signals and produces a start-up control signal with door, and this second Sheffer stroke gate then receives above-mentioned a plurality of second pulse signal and produces a release control signal.

5, privacy device as claimed in claim 4 is characterized in that, wherein this release control signal discharges this clamp pulse signal, makes this clamp pulse signal input to this video signal pre-amplifier.

6, privacy device as claimed in claim 3 is characterized in that, wherein in order to form the above-mentioned partial function key of this secret compound keys and this release compound keys, is the identical functions key.

7, privacy device as claimed in claim 3 is characterized in that, wherein is combined into above-mentioned a plurality of function keys of this secret compound keys and this release compound keys, is diverse function key.

8, privacy device as claimed in claim 3 is characterized in that, wherein this microprocessor is a firmware in devices.