CN102156512A - Computer system for preventing electromagnetic leakage related interference and liquid crystal display installed with the same - Google Patents
Computer system for preventing electromagnetic leakage related interference and liquid crystal display installed with the same Download PDFInfo
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- CN102156512A CN102156512A CN2011100883805A CN201110088380A CN102156512A CN 102156512 A CN102156512 A CN 102156512A CN 2011100883805 A CN2011100883805 A CN 2011100883805A CN 201110088380 A CN201110088380 A CN 201110088380A CN 102156512 A CN102156512 A CN 102156512A
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Abstract
The invention discloses a computer system for preventing electromagnetic leakage related interference and a liquid crystal display installed with the computer system, wherein electromagnetic radiation intensity values of high and low-frequency antennae are not less than the electromagnetic radiation intensity value of an interfered signal source and not more than 20% of the electromagnetic radiation intensity value of an interfered signal source; the numbers of high and low-frequency antennae are both more than 2; a plurality of high-frequency antennae and low-frequency antennae of the related interference system are respectively installed between a back metal shielding cover and a plastic shell of the liquid crystal display, namely on the outer periphery of the metal shielding cover; and a plurality of low-power low-radiation high and low-frequency antennae are precisely positioned and installed on the electromagnetic leakage signal source, namely a display panel, a display driving circuit and a display video interface, thereby reducing the radiation scope of the interference system, lowering the radiation intensity, and reducing the harm to the body of computer operator as well as the electromagnetic radiation pollution to the environment.
Description
Technical field
The present invention relates to a kind of electromagnetic interference (EMI) system, especially a kind of electromagnetic interference (EMI) system that is used to protect the computing machine electromagnetic information leakage, and further relate to a kind of LCD that adds this system.
Background technology
The protection of computerized information electromagnetic leakage is one of important topic of information security field, and means of defence commonly used mainly contains shield technology, TEMPEST technology and signal perturbation technique.At common and the anti-electromagnetic leakage problem of the office space (as army or government unit orderly rooms at different levels) that maintain secrecy to need arranged, vision signal sync correlation perturbation technique is unique comparatively feasible way, and this vision signal sync correlation interference unit that the office space need be not easy to build screened room again of maintaining secrecy also adopts the just means as the anti-electromagnetic information leakage of common office computer are much arranged in the reality.But problem is that formerly technology such as the disclosed patent document of notification number CN2745097Y " leakage of information protector " and the described protection countermeasure set of the disclosed patent document of notification number CN201352350Y " computerized information interference unit " all adopt a kind of signal conflicting mode of extensive style, be that interference unit is placed on the computing machine next door, the undesired signal of sending can be in one be wrapped in computing machine integral body in a big way, usually effective radiation radius is at 0.5-1 rice, because its effective radiation radius is big, the intensity height will certainly impact and damage on psychology and physiology the computer operator.
The disclosed patent document of technology publication number CN1658274A " safety protection display " formerly, though also be that emitting antenna is built within the LCD, but described emitting antenna does not adopt the mentality of designing of littleization volume, so still can not effectively avoid the actual bodily harm of its unnecessary electromagnetic radiation to the computer operater.
Summary of the invention
Technical matters to be solved by this invention is exactly the defective that exists at above-mentioned technology formerly, a kind of a plurality of emitting antennas that have are provided, the anti-electromagnetic leakage relevant interference system of the accurate location interference of littleization volume, and add this EVAC (Evacuation Network Computer Model) and can avoid electromagnetic radiation the computer operater to be caused the LCD of actual bodily harm most possibly.
Technical scheme of the present invention is achieved in that
Computing machine is prevented electromagnetic leakage relevant interference system, comprise relevant interference signal generation module and relevant interference signal emission module, described relevant interference signal generation module comprises the random series signal generating circuit, reference frequency circuit and a programmable logic device (PLD) part; Described relevant interference signal emission module comprises a high-frequency amplifier circuit and a low-frequency amplifier circuit, its signal is all from the programmable logic device (PLD) part, and the high frequency antenna and the low-frequency antenna that are coupled and are connected with high-frequency amplifier circuit and low-frequency amplifier circuit respectively, it is characterized in that the electromagnetic radiation intensity value of described high and low frequency antenna is not less than the electromagnetic radiation intensity value of disturbed information source, also is no more than 20% of its electromagnetic radiation intensity value of disturbed information source; The individual number average of described high and low frequency antenna is greater than 2.
Preferable, described high and low frequency antenna electromagnetic radiation intensity value only surpasses 10% of its electromagnetic radiation intensity value of disturbed information source; The number of described high and low frequency antenna is 2.
Add the LCD of the anti-electromagnetic leakage relevant interference system of the described computing machine of claim 1, the main body circuit board of described relevant interference system is installed in the LCD back metal radome; The power supply lead wire of described relevant interference system is connected on the 12v or the output of 5v direct current of LCD power module and draws on the angle, directly obtain the working power of relevant interference system from the LCD power module, 2 high frequency antennas and 2 low-frequency antennas of it is characterized in that described relevant interference system are installed at respectively between LCD back metal radome and the plastic casing, also are on the outer periphery of metallic shield.
Preferable, described LCD power module is connected to a trigger signal switch for the relevant interference system provides the 12v of power supply or the output of 5v direct current to draw the angle between going between with the relevant interference system power supply, vision signal in the signal input part of described trigger signal switch and the display is connected, control the open close of this trigger signal switch by the high-low level whether effectively described vision signal produces, thereby the work of further controlling the relevant interference system whether.
Term used herein " information source " is meant the signal radiation source of outside radiated electromagnetic wave, and as panel, driving circuit and the video interface etc. of LCD, it contains in extraradial electromagnetic wave usually detects the debit and wish the useful information intercepted and captured.
Beneficial effect of the present invention is:
1. directly the high and low frequency antenna of the low radiation of a plurality of miniwatts is accurately located and be installed on the information source of electromagnetic leakage, it is the video interface of display pannel, circuit of display driving and display, thereby dwindled the radiation scope of EVAC (Evacuation Network Computer Model), reduced radiation intensity, reduced to computer operater's physical impairment with to the electromagnetic radiation pollution of environment.
2. the power supply of relevant interference system and vision signal directly obtain from display interior, remove extra power transformer unit and external connecting line from.
3. control the switch of relevant interference system works power supply by the trigger switch that is loaded with vision signal, realize the robotization of EVAC (Evacuation Network Computer Model) mode of operation, thereby make EVAC (Evacuation Network Computer Model) transparent fully to the computer operator, be that the computer operator need not this EVAC (Evacuation Network Computer Model) of switch, whether whether effectively the work of EVAC (Evacuation Network Computer Model) decided by the vision signal of supplying with display fully.
Description of drawings
Fig. 1 is a relevant interference circuit system block scheme of the present invention.
Fig. 2 is the circuit block diagram that adds the LCD of described relevant interference system.
Fig. 3 is the structural representation that adds the LCD of described relevant interference system.
Fig. 4 is a trigger switch operating circuit synoptic diagram.
Among the figure: 1, display pannel 2, metallic shield 3, high frequency antenna 4, low-frequency antenna
Embodiment
Shown in Fig. 1 circuit block diagram, computing machine of the present invention is prevented electromagnetic leakage relevant interference system, comprise relevant interference signal generation module and relevant interference signal emission module, described relevant interference signal generation module comprises the random series signal generating circuit, the frame synchronizing signal circuit, reference frequency circuit and programmable logic device (PLD) part; Described relevant interference signal emission module comprises a high-frequency amplifier circuit and a low-frequency amplifier circuit, its signal is all from the programmable logic device (PLD) part, and the high frequency antenna and the low-frequency antenna that are coupled and are connected with high-frequency amplifier circuit and low-frequency amplifier circuit respectively, wherein, the electromagnetic radiation intensity value of described high and low frequency antenna is not less than the electromagnetic radiation intensity value of disturbed information source, also is no more than 20% of its electromagnetic radiation intensity value of disturbed information source; The individual number average of described high and low frequency antenna is greater than 2.
Preferred embodiment, described high and low frequency antenna electromagnetic radiation intensity value only surpass disturbed information source, as panel of LCD, driving circuit or video interface, and wherein 10% of the electromagnetic radiation intensity value of the information source of electromagnetic radiation intensity maximum; The number of described high and low frequency antenna is 2, and accurate respectively location is installed at from described information source nearer, and the place that can well bring into play interference effect again is as the outer periphery of LCD back metal radome.
Shown in Fig. 2 circuit block diagram and Fig. 3 structural representation, a kind of LCD that adds the anti-electromagnetic leakage relevant interference system of aforementioned calculation machine, the main body circuit board of described relevant interference system is installed in the LCD back metal radome 2, also comprise circuit of display driving plate, display power supply module and high voltage package in the metallic shield 2, metallic shield 2 is fixedlyed connected with the metal housing of display pannel 1, is shown the device plastic casing together and wraps up; The power supply lead wire of described relevant interference system is connected on the 12v or the output of 5v direct current of LCD power module and draws on the angle, directly obtain the working power of relevant interference system from the LCD power module, wherein, described relevant interference system has 2 high frequency antennas 3 and 2 low-frequency antennas 4 to be installed at respectively between LCD back metal radome and the plastic casing, also be on the outer periphery of metallic shield, 2 high frequency antennas 3 be installed at respectively metallic shield 2 about on two outer side edges (wherein the right side is not shown in the drawings); 2 low-frequency antennas 4 are installed at metallic shield respectively about in the of 2 on two outer side edges (wherein downside is not shown in the drawings).When described relevant interference system works, be installed at 2 high frequency antennas 3 on metallic shield 2 outer periphery and 2 low-frequency antennas 4 and will launch the electromagnetic interference signal of radiation intensity in only needing display pannel 1 and display video interface is wrapped in, the computer operater is caused actual bodily harm and environment is caused radiation pollution thereby effectively avoid interference the unnecessary electromagnetic radiation of system.
Be it can also be seen that by Fig. 2 again by behind the display video interface, the one tunnel has been carried on the circuit of display driving vision signal from the output of main frame video interface, another road has been carried on the relevant interference signal generation module of relevant interference system circuit board; 12V in the power module of display or 5V dc output power have been carried in the relevant interference system after by trigger signal switch, and the open close high-low level that is then produced by the whether effective of vision signal of trigger signal switch is controlled.
High and low frequency antenna shown in Fig. 3 can be doublet antenna, tours antenna, helical antenna, also can be based on the PCB antenna of RF chip.
Fig. 4 has provided the operating circuit synoptic diagram of trigger signal switch, described LCD power module is connected to a trigger signal switch for the relevant interference system provides the 12v of power supply or the output of 5v direct current to draw the angle between going between with the relevant interference system power supply, vision signal in the signal input part of described trigger signal switch and the display is connected, control the open close of this trigger signal switch by the high-low level whether effectively described vision signal produces, thereby the work of further controlling the relevant interference system whether.
The above only be the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto.Any design with relevant interference system littleization of emitting antenna volume, accurately location loading all should belong to the protection domain of the illustrated technical conceive of the present invention; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.
Claims (4)
1. computing machine is prevented electromagnetic leakage relevant interference system, comprise relevant interference signal generation module and relevant interference signal emission module, described relevant interference signal generation module comprises the random series signal generating circuit, frame synchronizing signal circuit, reference frequency circuit and programmable logic device (PLD) part; Described relevant interference signal emission module comprises a high-frequency amplifier circuit and a low-frequency amplifier circuit, its signal is all from the programmable logic device (PLD) part, and the high frequency antenna and the low-frequency antenna that are coupled and are connected with high-frequency amplifier circuit and low-frequency amplifier circuit respectively, it is characterized in that: the electromagnetic radiation intensity value of described high and low frequency antenna is not less than the electromagnetic radiation intensity value of disturbed information source, also is no more than 20% of its electromagnetic radiation intensity value of disturbed information source; The individual number average of described high and low frequency antenna is greater than 2.
2. computing machine according to claim 1 is prevented electromagnetic leakage relevant interference system, it is characterized in that: described high and low frequency antenna electromagnetic radiation intensity value only surpasses 10% of its electromagnetic radiation intensity value of disturbed information source; The number of described high and low frequency antenna is 2.
3. add the LCD of the anti-electromagnetic leakage relevant interference system of the described computing machine of claim 1, the main body circuit board of described relevant interference system is installed in the LCD back metal radome; The power supply lead wire of described relevant interference system is connected on the 12v or the output of 5v direct current of LCD power module and draws on the angle, directly obtain the working power of relevant interference system from the LCD power module, it is characterized in that: 2 high frequency antennas and 2 low-frequency antennas of described relevant interference system are installed at respectively between LCD back metal radome and the plastic casing, also are on the outer periphery of metallic shield.
4. LCD according to claim 3, it is characterized in that: described LCD power module is connected to a trigger signal switch for the relevant interference system provides the 12v of power supply or the output of 5v direct current to draw the angle between going between with the relevant interference system power supply, vision signal in the signal input part of described trigger signal switch and the display is connected, control the open close of this trigger signal switch by the high-low level whether effectively described vision signal produces, thereby the work of further controlling the relevant interference system whether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100883805A CN102156512A (en) | 2011-04-08 | 2011-04-08 | Computer system for preventing electromagnetic leakage related interference and liquid crystal display installed with the same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100883805A CN102156512A (en) | 2011-04-08 | 2011-04-08 | Computer system for preventing electromagnetic leakage related interference and liquid crystal display installed with the same |
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| CN102156512A true CN102156512A (en) | 2011-08-17 |
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| CN2011100883805A Pending CN102156512A (en) | 2011-04-08 | 2011-04-08 | Computer system for preventing electromagnetic leakage related interference and liquid crystal display installed with the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015117433A1 (en) * | 2014-07-16 | 2015-08-13 | 中兴通讯股份有限公司 | Radio frequency apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351292A (en) * | 1989-01-26 | 1994-09-27 | Cominvest Research Ab | Method and apparatus for preventing external detection of signal information |
| CN1658274A (en) * | 2005-04-04 | 2005-08-24 | 李大东 | Safety protection display |
| CN1930819A (en) * | 2004-05-24 | 2007-03-14 | 日本电信电话株式会社 | Information leakage preventive device and information leakage preventive method |
| CN201749471U (en) * | 2010-07-16 | 2011-02-16 | 北京三信时代信息公司 | Computer screen information protection device |
-
2011
- 2011-04-08 CN CN2011100883805A patent/CN102156512A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351292A (en) * | 1989-01-26 | 1994-09-27 | Cominvest Research Ab | Method and apparatus for preventing external detection of signal information |
| CN1930819A (en) * | 2004-05-24 | 2007-03-14 | 日本电信电话株式会社 | Information leakage preventive device and information leakage preventive method |
| CN1658274A (en) * | 2005-04-04 | 2005-08-24 | 李大东 | Safety protection display |
| CN201749471U (en) * | 2010-07-16 | 2011-02-16 | 北京三信时代信息公司 | Computer screen information protection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015117433A1 (en) * | 2014-07-16 | 2015-08-13 | 中兴通讯股份有限公司 | Radio frequency apparatus |
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Application publication date: 20110817 |