CN100392555C - Safety protection display - Google Patents
Safety protection display Download PDFInfo
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- CN100392555C CN100392555C CNB2005100599409A CN200510059940A CN100392555C CN 100392555 C CN100392555 C CN 100392555C CN B2005100599409 A CNB2005100599409 A CN B2005100599409A CN 200510059940 A CN200510059940 A CN 200510059940A CN 100392555 C CN100392555 C CN 100392555C
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 27
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 230000005855 radiation Effects 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims description 8
- 230000005764 inhibitory process Effects 0.000 claims description 7
- 230000000007 visual effect Effects 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 135
- 238000001228 spectrum Methods 0.000 description 13
- 239000000306 component Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
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Abstract
The present invention relates to a safety protection display which comprises a display panel. The present invention is mainly characterized in that the safety protection display also comprises a built-in high frequency antenna, a built-in low frequency antenna, a video information leakage preventing circuit, a VGA display signal, a liquid crystal control circuit, an image output control circuit, a line frequency control circuit, a field frequency control circuit, a power supply control circuit, a lamp tube electricity supply circuit, and a filter circuit for suppressing the conduction and the radiation, wherein the video information leakage preventing circuit comprises a random character generator, a frame synchronous signal, a reference frequency circuit, a programmable logic device part, a low frequency amplifying circuit, a low frequency coupling circuit, an alarm circuit, a high frequency amplifying circuit, a high frequency coupling circuit, a low frequency antenna and a high frequency antenna. The present invention has the advantages of stable performance, good environment of workers, leakage prevention of video information, and low manufacturing cost of the devices.
Description
Technical field
The present invention relates to a kind of product of electricity field.More particularly, the present invention relates to a kind of safety protection display, refer in particular to a kind of safety protection display of anti-video information leakage.The present invention should be divided into the big class of G06 in International Patent Classification (IPC).
Background technology
As everyone knows, the electromagnetic radiation that the display in the work produces, the electromagnetic leakage emission that is produced when computing machine and auxiliary device work thereof all can be propagated by space and conductor, and its result will inevitably carry away handled information.Steal receipts person in certain distance, just these signals can be recovered, if processing is that classified information will cause and divulges a secret by receiving the reduction means.Therefore, video information can stolen receipts person receives and reduction by technological means, and the security of classified information is brought great hidden danger.Though set up the leakage that screened room can prevent information, cost is too high, and electromagnetic pollution is serious, harmful, also influence communication.
Summary of the invention
The objective of the invention is to:, provide a kind of and can prevent video electromagnetic leakage emission, that cost is cheap relatively, harmless and help the safety protection display of communication at the deficiency of prior art.
The present invention seeks to be achieved through the following technical solutions:
Described safety protection display comprises a display panel, and principal feature is:
Described safety protection display also comprises: the filtering circuit of embedded high/low frequency antenna, anti-video information leakage circuit, VGA shows signal, liquid crystal control circuit, visual output control circuit, line frequency control circuit, field frequency control circuit, power control circuit, lamp tube power supply circuit and inhibition conduct radiation.Described VGA shows signal is connected with described liquid crystal control circuit, and described VGA shows signal is connected with described anti-video information leakage circuit.Described anti-video information leakage circuit is connected with described liquid crystal control circuit, and described anti-video information leakage circuit is connected with described embedded high/low frequency antenna.Described visual output control circuit is connected with described liquid crystal control circuit.Described liquid crystal control circuit connects described line frequency control circuit.Described liquid crystal control circuit connects described field frequency control circuit.Described liquid crystal control circuit connects described display panel.The filtering circuit of described inhibition conduct radiation connects described power control circuit.Described power control circuit connects described liquid crystal control circuit.Described line frequency control circuit connects described display panel.Described field frequency control circuit connects described display panel.Described lamp tube power supply circuit connects described display panel.
Described anti-video information leakage circuit comprises: random character generator SJZFFSQ, frame synchronizing signal ZTBXH, reference frequency circuit JZPLDL, programmable logic device (PLD) part, low-frequency amplifier circuit DPFDDL, low frequency coupled circuit, warning circuit BJDL, high-frequency amplifier circuit GPFDDL, high-frequency coupling circuit, low-frequency antenna and high frequency antenna.Described random character generator SJZFFSQ connects to the programmable logic device (PLD) part.Described frame synchronizing signal ZTBXH connects to the programmable logic device (PLD) part.Described reference frequency circuit JZPLDL connects to the programmable logic device (PLD) part.Described programmable logic device (PLD) partly connects to low-frequency amplifier circuit DPFDDL, and described low-frequency amplifier circuit DPFDDL connects warning circuit.Described low-frequency amplifier circuit DPFDDL connects low-frequency antenna DPTX by the low frequency coupled circuit.Described high-frequency amplifier circuit GPFDDL connects high frequency antenna GPTX by the high-frequency coupling circuit.
Described programmable logic device (PLD) partly has a programmable logic device (PLD) KBCLJQJ, has one group by resistance R
1, R
2, R
3, capacitor C
1And C
2The peripheral components that constitutes.Described resistance R
3, capacitor C
1Connect into series circuit, this series circuit and described capacitor C
2Back in parallel forms parallel circuit.Described resistance R
3With described capacitor C
2Public termination to programmable logic device (PLD) KBCLJQJ, described capacitor C
1With described capacitor C
2Common end grounding.Described resistance R
1An end ground connection, described resistance R
1The other end connect respectively to frame synchronizing signal ZTBXH, resistance R
2An end, described resistance R
2The other end connect the end of programmable logic device (PLD) KBCLJQJ.
Described low-frequency amplifier circuit part DPFDDL comprises amplifier tube Q1, resistance R
4, R
5, R
6, capacitor C
3, C
4, C
5, C
6And inductance L
4The grounded emitter of described amplifier tube Q1, the base stage of described amplifier tube Q1 connect respectively to resistance R
4An end, resistance R
5An end, capacitor C
3An end, described capacitor C
3Another termination to the end of programmable logic device (PLD) KBCLJQJ, described resistance R
4Other end ground connection, described resistance R
5The other end connect respectively to resistance R
6An end, capacitor C
4An end, capacitor C
5An end, capacitor C
6An end and power Vcc end, described resistance R
6The other end connect described inductance L
4An end, described inductance L
4The other end connect collector and capacitor C respectively to described amplifier tube Q1
7An end, capacitor C
7The other end connect described low-frequency antenna DPTX, described capacitor C
4Other end ground connection, described capacitor C
5Other end ground connection, described capacitor C
6Other end ground connection.
Described high-frequency amplifier circuit part GPFDDL comprises integrated circuit (IC)
2, resistance R
10, R
11, capacitor C
8, C
9, C
10, C
11, C
12, C
13, C
14, C
15, C
16, C
17, C
18, C
19, C
20And inductance L
1, L
2, L
3Described capacitor C
8A termination to described programmable logic device (PLD) KBCLJQJ, described capacitor C
8Another termination to described integrated circuit (IC)
2, described capacitor C
9An end ground connection, described capacitor C
9The other end connect respectively to power Vcc end, capacitor C
10An end, integrated circuit (IC)
2An end, described capacitor C
10The other end connect respectively to resistance R
10An end, resistance R
11An end, capacitor C
12An end, capacitor C
13An end, integrated circuit (IC)
2An end, described resistance R
10Another termination to the power Vcc end, described resistance R
11Other end ground connection, described capacitor C
12Other end ground connection, described capacitor C
13Other end ground connection, described capacitor C
11An end ground connection, described capacitor C
11The other end connect respectively to power Vcc end, integrated circuit (IC)
2An end, described capacitor C
14An end ground connection, described capacitor C
14The other end connect respectively to integrated circuit (IC)
2An end, inductance L
1An end, L
2An end, L
3An end, capacitor C
17An end, integrated circuit (IC)
2The other end, described inductance L
2The other end pass through capacitor C
15Ground connection, described inductance L
3The other end connect respectively to capacitor C
16An end, capacitor C
21An end, capacitor C
22An end, described capacitor C
16Other end ground connection, described capacitor C
21The other end and capacitor C
22The other end connect to high frequency antenna GPTX described inductance L respectively
1The other end connect respectively to capacitor C
18An end, capacitor C
19An end, capacitor C
20An end, power Vcc end, described capacitor C
18Other end ground connection, described capacitor C
19Other end ground connection, described capacitor C
20Other end ground connection, described capacitor C
17Other end ground connection.
Described warning circuit part BJDL comprises: triode Q2, Q3, diode D1, resistance R
7, R
8, R
9, capacitor C
23, C
24, C
25, C
26, C
27, C
28, C
29, C
30, hummer FM.Described capacitor C
23An end connect the collector of described amplifier tube Q1, described capacitor C
23The other end connect resistance R respectively
7An end and the positive pole of diode D1, described resistance R
7Other end ground connection, the negative pole of described diode D1 connects described capacitor C respectively
24An end and described resistance R
8An end, described capacitor C
24Other end ground connection, described resistance R
8The other end connect capacitor C respectively
25An end and the base stage of triode Q2, described capacitor C
25Other end ground connection, the grounded emitter of described triode Q2, described triode Q2 collector connect base stage and the resistance R of triode Q3 respectively
9An end, described resistance R
9The other end connect respectively: the end of hummer FM, power Vcc end, capacitor C
26An end, capacitor C
27An end, capacitor C
28+ end, capacitor C
29+ end, capacitor C
30An end, described capacitor C
26Other end ground connection, described capacitor C
27Other end ground connection, described capacitor C
28Other end ground connection, described capacitor C
29Other end ground connection, described capacitor C
30Other end ground connection, the collector of described triode Q3 connects the other end of described hummer FM, the grounded emitter of described triode Q3.Shake during described reference frequency circuit JZPLDL partly comprises f1, in shake f2 and in the f3 that shakes.The 2 end ground connection of f1 of shaking in described, 3 terminations are to programmable logic device (PLD) KBCLJQJ, 4 termination power Vcc end; The 2 end ground connection of f2 of shaking in described, 3 terminations are to programmable logic device (PLD) KBCLJQJ, 4 termination power Vcc end; The 2 end ground connection of f3 of shaking in described, 3 terminations are to programmable logic device (PLD) KBCLJQJ, 4 termination power Vcc end.
Described low frequency coupled circuit is a capacitor C
7Described high-frequency coupling circuit is by capacitor C
21And capacitor C
22The parallel circuit of forming.
The model of described programmable logic device (PLD) KBCLJQJ is BM-2000-A-1, and the model of described integrated circuit (IC) 2 is BM-2000-A-2.
Because the present invention has adopted above-mentioned technical scheme, utilize and press down the source method, adopt spectrum relevant interference technology, prevented the leakage of video information, therefore guaranteed the safety of important information.In addition, the present invention also has automatic warning, high brightness, high-resolution, and multi-frequency scanning, visual angle broadness, the response time is fast, and is low in energy consumption, advantages such as safety and environmental protection.
Description of drawings
The present invention will be described below in conjunction with accompanying drawing, wherein:
Accompanying drawing 1 is a circuit block diagram of the present invention.
Accompanying drawing 2 is block schemes of anti-video information leakage circuit of the present invention.
Accompanying drawing 3 is fundamental diagrams of anti-video information leakage circuit of the present invention.
From accompanying drawing 1, can see and the present invention includes: LCD display floater, embedded high/low frequency antenna, anti-Video information leakage circuit, VGA display, liquid crystal control circuit, image outpuT control circuit, OK Frequency control circuit, field frequency control circuit, power control circuit, lamp tube power supply circuit and inhibition conduct radiation Filter circuit.
From accompanying drawing 2,3, can see: random character generator SJZFFSQ, frame synchronizing signal ZTBXH, Reference frequency circuit JZPLDL, PLD part, low-frequency amplifier circuit DPFDDL, low frequency Coupling circuit, warning circuit BJDL, high-frequency amplifier circuit GPFDDL, high-frequency coupling circuit, low frequency sky Line DPTX and high frequency antenna GPTX.
Accompanying drawing 3 shows the concrete fundamental diagram of the present invention, and the back will be described in detail.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
As shown in Figure 1: described VGA shows signal is connected with described liquid crystal control circuit, and described VGA shows signal is connected with described anti-video information leakage circuit.Described anti-video information leakage circuit is connected with described liquid crystal control circuit, and described anti-video information leakage circuit is connected with described embedded high/low frequency antenna.Described visual output control circuit is connected with described liquid crystal control circuit.Described liquid crystal control circuit connects described line frequency control circuit.Described liquid crystal control circuit connects described field frequency control circuit.Described liquid crystal control circuit connects described display panel.The filtering circuit of described inhibition conduct radiation connects described power control circuit.Described power control circuit connects described liquid crystal control circuit.Described line frequency control circuit connects described display panel.Described field frequency control circuit connects described display panel.Described lamp tube power supply circuit connects described display panel.
Described anti-video information leakage circuit comprises: random character generator SJZFFSQ, frame synchronizing signal ZTBXH, reference frequency circuit JZPLDL, programmable logic device (PLD) part, low-frequency amplifier circuit DPFDDL, low frequency coupled circuit, warning circuit BJDL, high-frequency amplifier circuit GPFDDL, high-frequency coupling circuit, low-frequency antenna DPTX and high frequency antenna GPTX.Described random character generator SJZFFSQ connects to the programmable logic device (PLD) part.Described frame synchronizing signal ZTBXH connects to the programmable logic device (PLD) part.Described reference frequency circuit JZPLDL connects to the programmable logic device (PLD) part.Described programmable logic device (PLD) partly connects to low-frequency amplifier circuit DPFDDL, and described low-frequency amplifier circuit DPFDDL connects warning circuit BJDL.Described low-frequency amplifier circuit DPFDDL connects low-frequency antenna DPTX by the low frequency coupled circuit.Described high-frequency amplifier circuit GPFDDL connects high frequency antenna GPTX by the high-frequency coupling circuit.
Described programmable logic device (PLD) partly has a programmable logic device (PLD) KBCLJQJ, has one group by resistance R
1, R
2, R
3, capacitor C
1And C
2The peripheral components that constitutes.Described resistance R
3, capacitor C
1Connect into series circuit, this series circuit and described capacitor C
2Back in parallel forms parallel circuit; Described resistance R
3With described capacitor C
2Public termination to programmable logic device (PLD) KBCLJQJ, described capacitor C
1With described capacitor C
2Common end grounding.Described resistance R
1An end ground connection, described resistance R
1The other end connect respectively to frame synchronizing signal ZTBXH, resistance R
2An end, described resistance R
2The other end connect the end of programmable logic device (PLD) KBCLJQJ.
Described low-frequency amplifier circuit part DPFDDL comprises amplifier tube Q1, resistance R
4, R
5, R
6, capacitor C
3, C
4, C
5, C
6And inductance L
4The grounded emitter of described amplifier tube Q1, the base stage of described amplifier tube Q1 connect respectively to resistance R
4An end, resistance R
5An end, capacitor C
3An end, described capacitor C
3Another termination to the end of programmable logic device (PLD) KBCLJQJ, described resistance R
4Other end ground connection, described resistance R
5The other end connect respectively to resistance R
6An end, capacitor C
4An end, capacitor C
5An end, capacitor C
6An end and power Vcc end, described resistance R
6The other end connect described inductance L
4An end, described inductance L
4The other end connect collector and capacitor C respectively to described amplifier tube Q1
7An end, capacitor C
7The other end connect described low-frequency antenna DPTX, described capacitor C
4Other end ground connection, described capacitor C
5Other end ground connection, described capacitor C
6Other end ground connection.
Described high-frequency amplifier circuit part GPFDDL comprises integrated circuit (IC)
2, resistance R
10, R
11, capacitor C
8, C
9, C
10, C
11, C
12, C
13, C
14, C
15, C
16, C
17, C
18, C
19, C
20And inductance L
1, L
2, L
3Described capacitor C
8A termination to described programmable logic device (PLD) KBCLJQJ, described capacitor C
8Another termination to described integrated circuit (IC)
2, described capacitor C
9An end ground connection, described capacitor C
9The other end connect respectively to power Vcc end, capacitor C
10An end, integrated circuit (IC)
2An end, described capacitor C
10The other end connect respectively to resistance R
10An end, resistance R
11An end, capacitor C
12An end, capacitor C
13An end, integrated circuit (IC)
2An end, described resistance R
10Another termination to the power Vcc end, described resistance R
11Other end ground connection, described capacitor C
12Other end ground connection, described capacitor C
13Other end ground connection, described capacitor C
11An end ground connection, described capacitor C
11The other end connect respectively to power Vcc end, integrated circuit (IC)
2An end, described capacitor C
14An end ground connection, described capacitor C
14The other end connect respectively to integrated circuit (IC)
2An end, inductance L
1An end, L
2An end, L
3An end, capacitor C
17An end, integrated circuit (IC)
2The other end, described inductance L
2The other end pass through capacitor C
15Ground connection, described inductance L
3The other end connect respectively to capacitor C
16An end, capacitor C
21An end, capacitor C
22An end, described capacitor C
16Other end ground connection, described capacitor C
21The other end and capacitor C
22The other end connect to high frequency antenna GPTX described inductance L respectively
1The other end connect respectively to capacitor C
18An end, capacitor C
19An end, capacitor C
20An end, power Vcc end, described capacitor C
18Other end ground connection, described capacitor C
19Other end ground connection, described capacitor C
20Other end ground connection, described capacitor C
17Other end ground connection.
Described warning circuit part BJDL comprises: triode Q2, Q3, diode D1, resistance R
7, R
8, R
9, capacitor C
23, C
24, C
25, C
26, C
27, C
28, C
29, C
30, hummer FM; Described capacitor C
23An end connect the collector of described amplifier tube Q1, described capacitor C
23The other end connect resistance R respectively
7An end and the positive pole of diode D1, described resistance R
7Other end ground connection, the negative pole of described diode D1 connects described capacitor C respectively
24An end and described resistance R
8An end, described capacitor C
24Other end ground connection, described resistance R
8The other end connect capacitor C respectively
25An end and the base stage of triode Q2, described capacitor C
25Other end ground connection, the grounded emitter of described triode Q2, described triode Q2 collector connect base stage and the resistance R of triode Q3 respectively
9An end, described resistance R
9The other end connect respectively: the end of hummer FM, power Vcc end, capacitor C
26An end, capacitor C
27An end, capacitor C
28+ end, capacitor C
29+ end, capacitor C
30An end, described capacitor C
26Other end ground connection, described capacitor C
27Other end ground connection, described capacitor C
28Other end ground connection, described capacitor C
29Other end ground connection, described capacitor C
30Other end ground connection, the collector of described triode Q3 connects the other end of described hummer FM, the grounded emitter of described triode Q3.
Shake during described reference frequency circuit JZPLDL partly comprises f1, in shake f2 and in the f3 that shakes.The 2 end ground connection of f1 of shaking in described, 3 terminations are to programmable logic device (PLD) KBCLJQJ, 4 termination power Vcc end; The 2 end ground connection of f2 of shaking in described, 3 terminations are to programmable logic device (PLD) KBCLJQJ, 4 termination power Vcc end; The 2 end ground connection of f3 of shaking in described, 3 terminations are to programmable logic device (PLD) KBCLJQJ, 4 termination power Vcc end.
Described low frequency coupled circuit is a capacitor C
7Described high-frequency coupling circuit is by capacitor C
21And capacitor C
22The parallel circuit of forming.The model of described programmable logic device (PLD) KBCLJQJ is BM-2000-A-1, and the model of described integrated circuit (IC) 2 is BM-2000-A-2.
Here be noted that the annexation of the connection terminal of each peripheral components and central circuit, those skilled in the art utilizes existing professional knowledge just can realize, does not repeat them here.
Anti-video information leakage circuit is an important content of the present invention, the spectrum of use correlation technique, the feature of utilizing video to show, the random extraction vision signal, introduce the frame synchronizing signal of video, with the frequency spectrum of programmable logic device (PLD) with the coherent signal utilization spectrum correlation technique of video synthetic and video spot correlation in programming device.Liquid crystal control circuit is a core component of the present invention, receives the VGA signal of video card, resolves, and outputs on the LCD display panel.Described its effect of visual o controller is specially shows signal to be handled, and circuit can be exported the video card signal frequency according to VGA, adjusts signal response time.Described power control circuit is the supply module to display.The LCD display panel adopts the TFT-LCD panel, has improved the reaction velocity of liquid crystal display.The filtering circuit of described inhibition conduct radiation by the filtering to power supply, filters out the vision signal through the power lead conduct radiation, to playing inhibiting effect by the power lead conduct radiation.Described lamp tube power supply circuit also has its characteristics: LCD adopts U-shaped pipe backlight, brightness is increased, and the brightness of whole screen is also more even.
The present invention suppresses it according to the characteristics of computing machine electromagnetic leakage and disturbs, and utilizes programmable logic device (PLD), and the frame synchronizing signal drawing-in system is synchronous by the programming parse for frame, analyzes the rule of display message.In the present embodiment, three benchmark frequencies are provided, the display message rule of utilizing programmable logic device (PLD) to analyze, synthesize ten kilo hertzs to the low-frequency spectra of hundreds of megahertz and the high frequency spectrum about hundreds of megahertz to a kilo-mega cycles per second, utilize high-frequency amplifier circuit and low-frequency amplifier circuit to amplify respectively, again by the effect of antenna to realize suppressing and disturbing.Programmable logic device (PLD) is an important component part of the present invention, and all signals are all in this generation, and are synchronous by the programming parse for frame after the frame synchronizing signal introducing, analyzes the rule of display message, produces relevant frequency spectrum according to the rule that shows.The reference frequency circuit is mainly formed by shaking among three of F1, F2 and the F3, shakes in described three and selects three different frequencies that the meaning represented is arranged, for programmable logic device (PLD) provides reference frequency.Low-frequency amplifier circuit is mainly by amplifier tube Q1, and the coupled circuit that coupling inductance L 1 and relevant appearance resistor are formed is formed, and it mainly acts on is that low-frequency spectra with programmable logic device (PLD) amplifies and the frequency spectrum that will not act on by coupled circuit filter.High-frequency amplifier circuit is mainly by integrated circuit (IC) 2, the coupled circuit that coupling inductance L1, L2, L3 and relevant appearance resistor are formed is formed, and it mainly acts on is that high frequency spectrum with programmable logic device (PLD) amplifies and the frequency spectrum that will not act on by coupled circuit filter.Warning circuit mainly comprises current amplifier tube Q2, Q3 and hummer FM and by the frequency time variant voltage change-over circuit that resistance R 7, diode D1, capacitor C 24 are formed, comprises the filtering circuit of being made up of electric capacity in addition.It mainly acts on, and the back warning circuit that breaks down can be reported to the police automatically, and the prompting staff notes.The function of low-and high-frequency antenna is that the frequency spectrum with the frequency spectrum of high frequency and low frequency sends.Described frame synchronization importation ZTBSR is directly provided by the video chip of computing machine, is prior art, and its circuit diagram omits, and its major function is the analysis foundation that video is provided for programmable logic device (PLD).
Facts have proved, stable performance of the present invention, improved staff's environment, what is more important: the present invention prevented video information leakage, reduced the cost of equipment.
Claims (2)
1. safety protection display, described safety protection display comprises a display panel, it is characterized in that:
Described safety protection display also comprises: the filtering circuit of embedded high/low frequency antenna, anti-video information leakage circuit, VGA shows signal, liquid crystal control circuit, visual output control circuit, line frequency control circuit, field frequency control circuit, power control circuit, lamp tube power supply circuit and inhibition conduct radiation;
Described VGA shows signal is connected with described liquid crystal control circuit, and described VGA shows signal is connected with described anti-video information leakage circuit,
Described anti-video information leakage circuit is connected with described liquid crystal control circuit, and described anti-video information leakage circuit is connected with described embedded high/low frequency antenna,
Described visual output control circuit is connected with described liquid crystal control circuit,
Described liquid crystal control circuit connects described line frequency control circuit,
Described liquid crystal control circuit connects described field frequency control circuit,
Described liquid crystal control circuit connects described display panel,
The filtering circuit of described inhibition conduct radiation connects described power control circuit,
Described power control circuit connects described liquid crystal control circuit,
Described line frequency control circuit connects described display panel,
Described field frequency control circuit connects described display panel,
Described lamp tube power supply circuit connects described display panel.
2. safety protection display according to claim 1 is characterized in that:
Described anti-video information leakage circuit comprises: random character generator (SJZFFSQ), frame synchronizing signal (ZTBXH), reference frequency circuit (JZPLDL), programmable logic device (PLD) part, low-frequency amplifier circuit (DPFDDL), low frequency coupled circuit, warning circuit (BJDL), high-frequency amplifier circuit (GPFDDL), high-frequency coupling circuit, low-frequency antenna (DPTX) and high frequency antenna (GPTX)
Described random character generator (SJZFFSQ) connects to the programmable logic device (PLD) part,
Described frame synchronizing signal (ZTBXH) connects to the programmable logic device (PLD) part,
Described reference frequency circuit (JZPLDL) connects to the programmable logic device (PLD) part,
Described programmable logic device (PLD) partly connects to low-frequency amplifier circuit (DPFDDL),
Described low-frequency amplifier circuit (DPFDDL) connects warning circuit (BJDL),
Described low-frequency amplifier circuit (DPFDDL) connects low-frequency antenna (DPTX) by the low frequency coupled circuit,
Described high-frequency amplifier circuit (GPFDDL) connects high frequency antenna (GPTX) by the high-frequency coupling circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100599409A CN100392555C (en) | 2005-04-04 | 2005-04-04 | Safety protection display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100599409A CN100392555C (en) | 2005-04-04 | 2005-04-04 | Safety protection display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1658274A CN1658274A (en) | 2005-08-24 |
| CN100392555C true CN100392555C (en) | 2008-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100599409A Expired - Fee Related CN100392555C (en) | 2005-04-04 | 2005-04-04 | Safety protection display |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101437148B (en) * | 2007-11-16 | 2010-12-01 | 西安电子科技大学 | Video information leakage resistance method and processing device |
| CN102156512A (en) * | 2011-04-08 | 2011-08-17 | 张应刚 | Computer system for preventing electromagnetic leakage related interference and liquid crystal display installed with the same |
| CN103886269B (en) * | 2014-03-11 | 2017-12-08 | 中国科学院信息工程研究所 | A kind of video information electromagnetic leakage interference prevention method and apparatus |
| CN105208305B (en) * | 2015-08-20 | 2019-02-26 | 河北上元智能科技股份有限公司 | Video Character Superpose circuit and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2068254U (en) * | 1990-05-28 | 1990-12-26 | 中国人民解放军57351部队 | Anti-spillover correlation interference unit |
| JPH0683298A (en) * | 1992-09-04 | 1994-03-25 | Fujitsu Ltd | Preventing system for illeagally viewing television |
| JP2003244104A (en) * | 2002-02-21 | 2003-08-29 | Ntt Advanced Technology Corp | Method for preventing information reproduction by leakage electromagnetic wave and information devices |
| US20050044384A1 (en) * | 2003-07-30 | 2005-02-24 | Canon Kabushiki Kaisha | Electric conference system and control method thereof |
| CN1588841A (en) * | 2004-10-08 | 2005-03-02 | 李大东 | Safety protective server refer to secrete |
-
2005
- 2005-04-04 CN CNB2005100599409A patent/CN100392555C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2068254U (en) * | 1990-05-28 | 1990-12-26 | 中国人民解放军57351部队 | Anti-spillover correlation interference unit |
| JPH0683298A (en) * | 1992-09-04 | 1994-03-25 | Fujitsu Ltd | Preventing system for illeagally viewing television |
| JP2003244104A (en) * | 2002-02-21 | 2003-08-29 | Ntt Advanced Technology Corp | Method for preventing information reproduction by leakage electromagnetic wave and information devices |
| US20050044384A1 (en) * | 2003-07-30 | 2005-02-24 | Canon Kabushiki Kaisha | Electric conference system and control method thereof |
| CN1588841A (en) * | 2004-10-08 | 2005-03-02 | 李大东 | Safety protective server refer to secrete |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1658274A (en) | 2005-08-24 |
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