CN112150940A

CN112150940A - Grating type screen display system for information safety protection

Info

Publication number: CN112150940A
Application number: CN202011003142.5A
Authority: CN
Inventors: 王鹏; 杨盼
Original assignee: Zhengzhou Shenglong Information Technology Co ltd
Current assignee: Zhengzhou Shenglong Information Technology Co ltd
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2020-12-29
Anticipated expiration: 2040-09-22
Also published as: CN112150940B

Abstract

The invention discloses a grating type screen display system for information safety protection. The LED lamp comprises a display screen, a display controller and grating glasses, wherein first grating strips and second grating strips are adhered to the display screen at intervals, a first picture only displays LED lamp beads which are adhered to all the first grating strips correspondingly, a second picture is displayed on the LED lamp beads which are adhered to all the second grating strips correspondingly, and the second picture is a scrambled picture of the first picture; two lenses of the grating glasses can only receive the first picture and simultaneously shield the second picture, so that the display content of the first picture can be seen through the grating glasses. The system realizes normal watching through the grating glasses, the scrambled pictures are obtained when the shooting equipment shoots the display screen, and various different scrambling effects can be realized through various modes, so that the system is suitable for various application scenes.

Description

Grating type screen display system for information safety protection

Technical Field

The invention relates to the technical field of display, in particular to a grating type screen display system for information safety protection.

Background

At present, a large-screen display screen is widely applied in some meeting rooms and monitoring rooms, but the content displayed by the display screen is not expected to be shot and recorded in some application scenes, so that a corresponding technical means is needed to solve the information safety protection function of the content displayed by the display screen, that is, when a video camera or a camera is used for shooting and recording or photographing the display screen, clear content of the display screen cannot be obtained, and meanwhile, people are ensured to normally watch the content displayed on the display screen.

Disclosure of Invention

The invention mainly solves the technical problem of providing a grating type screen display system for information safety protection, and solves the problems that the prior art lacks information display safety protection on the display content of a display screen, prevents illegal shooting, and does not influence normal watching of people.

In order to solve the above technical problem, one technical solution adopted by the present invention is to provide a grating type screen display system for information security protection, including: the display screen comprises an LED display array, a first grating strip and a second grating strip are adhered to the LED display array at intervals, the first grating strip and the second grating strip respectively change the vibration direction of light emitted by the LED, and the two changed vibration directions are opposite; the display controller only displays the LED lamp beads correspondingly adhered to all the first grating strips correspondingly to a first picture to be displayed, and displays a second picture on the LED lamp beads correspondingly adhered to all the second grating strips, and the displayed content of the second picture is taken as interference to the first picture, so that the picture displayed by the whole LED display array is a scrambled picture mixed with the first picture and the second picture; correspondingly, two lenses of the grating glasses correspond to first pictures which can only receive and penetrate through the LED light of the first grating strip, and simultaneously, the two lenses of the grating glasses are used for shielding second pictures which correspond to the LED light of the second grating strip, so that the first picture display contents can be seen through the grating glasses.

Preferably, the first grating strips and the second grating strips are arranged at intervals horizontally, at intervals vertically or in a checkerboard pattern.

Preferably, the display content of the second screen is obtained by performing translation, rotation and/or random combination on the display content of the first screen.

Preferably, the entire first screen is divided into a plurality of sub-screens, and the second screen display content is generated by performing translation, rotation, or random combination processing on each of the sub-screens in the first screen.

Preferably, when the display screen displays the dynamic video, the image frame displayed by the second picture is the image frame of the first picture after the time delay.

Preferably, the display controller includes a display morphology analysis unit for performing a display morphology analysis on the display data to distinguish between still images and moving videos.

Preferably, the display controller performs recognition analysis on the optical characteristics of the first screen display content, then performs shape-forming display area division on the first screen display content, and generates the second screen display content correspondingly after performing translation, rotation and random combination processing on each shape-forming area.

Preferably, the display controller performs recognition analysis on the information features of the display content of the first picture to obtain a feature region corresponding to the sensitive information features in the first picture, and generates the display content of the corresponding display region of the second picture after scrambling the feature region.

Preferably, when the first screen display content includes a character symbol, a character symbol similar to the character symbol is generated as the display content of the second screen corresponding display area.

Preferably, the display controller further prevents the display screen from being photographed by regulating a refresh rate of the display screen.

The invention has the beneficial effects that: the invention discloses a grating type screen display system for information safety protection. The LED lamp comprises a display screen, a display controller and grating glasses, wherein first grating strips and second grating strips are adhered to the display screen at intervals, a first picture only displays LED lamp beads which are adhered to all the first grating strips correspondingly, a second picture is displayed on the LED lamp beads which are adhered to all the second grating strips correspondingly, and the second picture is a scrambled picture of the first picture; two lenses of the grating glasses can only receive the first picture and simultaneously shield the second picture, so that the display content of the first picture can be seen through the grating glasses. The system realizes normal watching through the grating glasses, the scrambled pictures are obtained when the shooting equipment shoots the display screen, and various different scrambling effects can be realized through various modes, so that the system is suitable for various application scenes.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 2 is a diagram illustrating a first frame display content shift in an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 3 is a diagram illustrating a mixed display effect of a first frame and a second frame after being translated in an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 4 is a graph of a mixed word size scrambling display effect in an embodiment of a raster-type on-screen display system for information security protection according to the present invention;

FIG. 5 is a diagram illustrating the mixed display effect of a first frame and a second frame after rotation processing in an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 6 is a schematic diagram of a first frame region division in an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 7 is a schematic diagram of a display screen composed of a plurality of display units in an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 8 is a block diagram of a display controller in an embodiment of a raster screen display system for information security protection in accordance with the present invention;

FIG. 9 is a schematic diagram of a first frame-shaped region partition in an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 10 is a schematic diagram of a refined segmentation of the first shaped region of FIG. 9;

FIG. 11 is a diagram of an information feature analysis recognition scenario in an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 12 is a diagram illustrating sensitive information feature interference handling in an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 13 is a graph illustrating a comparison between a display refresh cycle curve and a capture device refresh cycle curve in an embodiment of a raster-type screen display system for information security protection according to the present invention;

FIG. 14 is a diagram of the display screen displaying the captured effect in an embodiment of the raster screen display system for information security protection according to the present invention;

FIG. 15 is a flowchart according to an embodiment of a raster screen display method for information security protection.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Fig. 1 is a block diagram of a raster-type screen display system according to an embodiment of the present invention. In fig. 1, the system comprises: the display screen 1 comprises an LED display array, a first grating strip 11 and a second grating strip 12 are adhered to the LED display array at intervals, the first grating strip 11 and the second grating strip 12 have the function of changing the vibration direction of light to the light emitted by the LED, the change of the vibration direction of the light by the first grating strip 11 and the change of the vibration direction of the light by the second grating strip 12 are just opposite, or the vibration direction of the light passing through the first grating strip 11 is a first vibration direction, the vibration direction of the light passing through the second grating strip 12 is a second vibration direction, and the first vibration direction and the second vibration direction are just opposite; the display controller 2 correspondingly displays a first picture to be displayed only on the LED lamp beads correspondingly adhered to the first grating strips 11, displays a second picture on the LED lamp beads correspondingly adhered to the second grating strips 12, and the displayed content of the second picture is used as interference to the first picture, so that the picture displayed by the whole LED display array is a scrambled picture mixed with a normal picture and an interference picture. Therefore, when the shooting device 4 is used in this situation, including various video recording and image shooting devices with shooting and image pick-up functions, the whole shot picture of the LED display array is a scrambled picture or a picture called abnormal display, and display effects such as defects, ghosts, screens, character confusion, mosaic, sensitive information hiding and losing and the like can occur, so that the shot video and images cannot be normally viewed and identified, or important sensitive information is shielded, and the whole screen or sensitive period display area loses the definition requirement met by normal display, thereby having the purpose of preventing shooting. Or the shot display content is distorted and cannot be recovered, so that the actual appearance is influenced, and appearance fatigue and visual impairment are caused. Therefore, the scrambled pictures include incomplete pictures, and unclear and fuzzy pictures displayed in whole or in part, that is, clear, complete and effective shot pictures and videos cannot be formed, and visual fatigue is caused by influencing the impression effect.

Note that fig. 1 only schematically shows the first grating bars 11 and the second grating bars 12, and in practical applications, the first grating bars 11 and the second grating bars 12 have a smaller pitch, so that it is fully possible to display one image by all the LED arrays corresponding to the first grating bars 11, and display another image by all the LED arrays corresponding to the second grating bars 12, which is equivalent to dividing the display screen 1 into two interlaced and overlapped display arrays for respectively displaying two images, each of the two arrays occupies half of the display screen 1, and the two images are simultaneously displayed on the display screen 1.

Correspondingly, two lenses of the grating glasses 3 correspond to only receive first picture display contents corresponding to the LED light penetrating through the first grating strips 11, and simultaneously shield second picture interference contents corresponding to the LED light of the second grating strips 12, so that the normal first picture display contents can be seen through the glasses. That is to say, the light in the first vibration direction generated after being filtered by the first grating strip can be passed through by both of the two lenses, and the light in the second vibration direction generated after being filtered by the second grating strip cannot be passed through by both of the two lenses.

In fact, the two lenses of the lenticular glasses 3 are also provided with a light-transmitting film having the same vibration direction as the first lenticular pattern 11, so that light in the first vibration direction can pass through the two lenses, and light in the second vibration direction is prevented from passing through the two lenses.

Therefore, after the normal picture passes through the first grating bar 11, the first picture, namely the normal picture, can be observed through the grating glasses 3, and meanwhile, after the second picture, namely the interference picture passes through the second grating bar 12, the interference picture can not be observed through the grating glasses 3, so that the person wearing the grating glasses 3 can clearly see the normal picture. In the case of the photographing apparatus 4, since the lens is used to photograph directly on the display screen 1, the display screen 1 displays a mixed picture of a normal picture and an interference picture, which is a scrambled picture as a whole, and thus a normal picture cannot be obtained, which has an effect of preventing photographing, or the photographed picture has no aesthetic value.

Preferably, the first grating strips 11 and the second grating strips 12 shown in fig. 1 are arranged at intervals horizontally, for example, the first grating strips 11 are adhered to the surface of the first row of LED beads, the second grating strips 12 are adhered to the surface of the adjacent second row of LED beads, the first grating strips 11 are adhered to the surface of the third row of LED beads, the second grating strips 12 are adhered to the surface of the adjacent fourth row of LED beads, and so on.

Preferably, the first grating strips 11 and the second grating strips 12 are arranged at vertical intervals, that is, the first grating strips 11 are adhered to the surface of the first column of LED beads, the second grating strips 12 are adhered to the surface of the adjacent second column of LED beads, the first grating strips 11 are adhered to the surface of the third column of LED beads, the second grating strips 12 are adhered to the surface of the adjacent fourth column of LED beads, and so on. Thus, the content displayed on the first screen is displayed by the rows of LED beads adhered with the first grating strips 11, and the content displayed on the second screen is displayed by the rows of LED beads adhered with the second grating strips 12. In this way, the interference picture and the normal picture can be mixed, and the purposes of preventing shooting by the camera equipment and normally watching by the grating glasses 3 can be achieved.

Preferably, the first grating strips 11 and the second grating strips 12 may be arranged in a checkerboard manner, which is similar to a checkerboard of a chess, that is, the LED array display screen is divided into a plurality of square or rectangular or equal-side-length hexagonal display units or display areas, wherein when the first grating strips 11 are adhered to the surface of the LED lamp beads corresponding to one display unit or display area, the second grating strips 12 are adhered to the surface of the LED lamp beads of the display unit adjacent to the display unit; when a second grating strip 12 is adhered to the surface of the LED lamp bead corresponding to one display unit or display area, a first grating strip 11 is adhered to the surface of the LED lamp bead of the display unit adjacent to the display unit, and so on. Thus, the content displayed on the first screen is displayed by the LED lamp beads of the display unit to which the first grating bars 11 are attached, and the content displayed on the second screen is displayed by the LED lamp beads of the display unit to which the second grating bars 12 are attached. In this way, the interference picture and the normal picture can be mixed, and the purposes of preventing shooting by the camera equipment and normally watching by the grating glasses 3 can be achieved.

Preferably, in practical applications, the display content of the second screen and the display content of the first screen have a correlation, and the display content of the second screen may be generated by rearranging and combining the display content of the first screen after disordering the order.

Preferably, the display content of the first screen is expressed in a matrix form, and each LED lamp corresponding to a corresponding position in the array formed by the first grating bars of the LEDs is displayed correspondingly. First picture HM₁The display content is as follows:

wherein h is₁l₁The content displayed by the 1 st row and 1 st column pixels in the LED display array with the first grating strips stuck in the display, h₁l₂Which represents what is displayed by row 1 and column 2 pixels, and so on, for a total of M rows and N columns.

Preferably, the display content of the second screen is obtained by shifting the display content of the first screen, specifically, by applying the first screen HM₁Displaying the content to perform: the up-down cyclic shift between rows, the left-right cyclic shift between columns, and the shift of both rows and columns realize the second picture HM₂And generating display content.

For example a second picture HM generated by cyclically shifting the upper and lower lines by 1 line₂The display content is as follows:

for example, a second picture HM generated by cyclically shifting the left and right columns by 1 column₂The display content is as follows:

for example, the second picture HM is generated by cyclically shifting the up-down line by 1 line and cyclically shifting the left-right line by 1 line₂The display content is as follows:

as can be seen from the above embodiments, the second screen content is formed by rearranging and combining the first screen content, and this processing is based on the overall processing effect of the display content of the entire display screen, as shown in fig. 2, for example, for the first screen RT1, which is equivalent to dividing the screen into two parts, i.e., the upper half is content 1 and the lower half is content 2, the up-down conversion can be performed by the up-down translation transformation, so as to form the display content of the second screen RT2, i.e., the upper half is content 2 and the lower half is content 1, and then the display content of the second screen RT2 and the display content displayed by the first screen RT1 are respectively displayed on the display array corresponding to the second raster bar 12 and the display array corresponding to the first raster bar 11 on the same display screen, so as to form an interference mixed display of the overall display; for another example, for the first picture RT3, the left and right of the picture are divided into two parts, i.e., the left half is content 1 and the right half is content 2, and the left and right parts can be exchanged by left and right translation transformation, so as to form the display content of the second picture RT4, i.e., the left half is content 2 and the right half is content 1; in the case where, for example, the display contents of the second screen RT6 are formed by performing the up-down panning switching of the up-down two portions of the first screen RT5 and then performing the left-right panning switching of the left-right two portions, it can be seen that the combined panning in these two ways corresponds to the division of the first screen into 4 display content areas, i.e., content 1 to content 4, and then the panning switching of the display contents of these 4 areas.

Preferably, the left-right translation amount and the up-down translation amount can be flexibly selected and set as required, based on the actual interference effect, in the description of fig. 2, the left-right translation amount corresponds to one half of the number of display matrix rows of the whole display screen, and the up-down translation amount corresponds to one half of the number of display matrix rows of the whole display screen. As shown in fig. 3, the blending effect after shifting the columns left and right is the half of the number of columns of the display matrix is not selected as the amount of shift, but only for the purpose of schematically showing and illustrating the blending effect after shifting, it can be seen that a significant ghost interference effect has been generated.

Preferably, for the character symbol, a certain interference effect can be generated by the translation, and even the best interference effect which is difficult to identify can be generated. In this regard, as shown in fig. 4, the normal display text in the mixed display text content of the first row XS1 is "good learning day-to-day upward", and the interference text selected in the first row is "good learning day-to-day upward" after being translated left and right by half, it can be seen that there is a good interference effect, but the effect of the superposition of "learning" and "upper" can be distinguished. The mixed display text content of the second line XS2 is then two lines of identical "good learning heaven-top", just after a downward and rightward interlaced shift and a mixed superposition, and this disturbing effect should be said to be bad, because no hard-to-distinguish effect is produced on the text. The third row XS3 shows the result of mixing the characters "good learning day and day up" and the interfering character "you are in american and american with you's down, and no translation method is used to generate the interfering picture, but it can be seen that the third row XS3 has better interfering effect than the two rows above, because the third row correspondingly finds out the structure similar to that of the character (e.g.," good "and" you "are both left and right structures), the strokes similar (e.g.," good "and" you "are both vertical and left strokes, and right strokes with vertical hooks), and the number of strokes close to each other, for example," up "corresponds to" down "," up "corresponds to" ask "," day "corresponds to" american "," learning "corresponds to" down ", and" learning "corresponds to" down ". The display text in the fourth row XS4 is "Advice quick", the corresponding interference text is "4 oujop pvjohtv", and it can be seen that the interference effect is also better, because we find similar interference letters or numbers for each letter displayed, for example, "a" corresponds to "4", "d" corresponds to "o", and so on. Therefore, similar interference characters must be found for the display characters, so that the best interference effect can be achieved, which is more obvious than the interference effect achieved by the above translation, and belongs to the highly targeted matching interference based on the display content, which will be further described later.

The above is mainly to generate the display content of the second screen based on the panning of the display content of the first screen. Preferably, the display content of the second screen is obtained by rotating the display content of the first screen, that is, the display content of the second screen is generated by rotating the display content of the first screen, and the angle of rotation may also be set according to the interference effect. For example, such as the first frame HM₁The display content is as follows:

after 45 degrees of counterclockwise rotation, a second picture HM is generated₂The display content is as follows:

further, as shown in fig. 5, the first image YT0 is rotated counterclockwise by 10 degrees to obtain a second image, and then mixed with the first image YT0 to obtain an interference image JR 1; the first picture YT0 is rotated 20 degrees counterclockwise to obtain a second picture, and then the second picture is mixed with the first picture YT0 to obtain an interference picture JR 2; the first image YT0 is rotated 90 degrees counterclockwise to obtain a second image, and then the second image YT0 is mixed with the first image YT0 to obtain an interference image JR 9. As can be seen from the interference effect, the interference picture JR1 can also distinguish the main blade of the windmill in the first picture YT0, the interference picture JR2 has difficulty in distinguishing the main blade of the windmill in the first picture YT0, and the interference picture JR3 has not been able to distinguish the main blade of the windmill in the first picture YT0 at all. Therefore, it can be seen that the interference effect has a close relationship with the composition structure and the rotation angle of the display image, because the windmill is a circular structure in this example, the interference can be generated by mixing and overlapping the rotation image, and the interference effect can be more obvious if the colors can be presented.

Further preferably, the translation and rotation processes are actually rearrangement and combination of the first screen display contents, and these two processing methods may be used in combination, for example, translation first and rotation second. The translation and rotation processing can rearrange the display content of the first picture in a mathematical calculation mode, and the method has certain calculability, and has the advantages of high processing speed and simple implementation mode.

Preferably, the display content of the second picture is obtained by randomly combining the display content of the first picture, that is, the display content of the first picture is randomly arranged and combined, that is, the display content of the first picture is randomly scrambled, and then the scrambled display content of the first picture is randomly combined into the display content of the second picture.

Further, the above-mentioned translation, rotation, and random combination processing methods may be used in combination. In addition, the above is performed based on the whole frame of the first frame, and the whole frame of the first frame may be subjected to region division, which is not related to the frame display content, i.e. the first frame is divided into a plurality of sub-frames or sub-regions, as shown in fig. 6, in the first frame HT1, the display frame is divided into a first sub-frame HT11 and a second sub-frame HT12, and it can be seen that the first sub-frame HT11 is located in the central region of the first frame HT1 and is the main region of the display frame, and the second sub-frame HT12 is located in the peripheral region of the first sub-frame HT 11. In the process of generating the second picture, the above-mentioned translation, rotation or/and random combination processing method may be performed on these different sub-pictures in the first picture, respectively. For example, the rotation process is performed for the first sub-picture HT11 located in the center area, and the panning process is performed for the second sub-picture HT12 in the peripheral area. By the method, the first picture can be further refined, and the problems that some local areas cannot be covered or the effect is poor when the whole picture is subjected to the translation, rotation and/or random combination processing are solved.

Further, as shown in fig. 7, the sub-screens of the first screen may be further distinguished based on the structural composition of the display screen, because the large display screen XP1 is usually formed by seamlessly splicing a plurality of display units XP10 having the same shape and structure, and the display controller may perform independent display control on each display unit XP10, so that the above-mentioned processing methods of translation, rotation, random combination and the like may be performed on the first partial screen corresponding to each display unit XP10, so as to generate the second partial screen corresponding to the display unit XP10, and then the first partial screen and the second partial screen are mixed into the local mixed interference screen displayed corresponding to the display unit XP 10. The mode is favorable for improving the granularity of the interference display of the whole screen, enhancing the interference effect and solving the problem that the omission or the local poor interference effect can occur during the whole screen processing, so that the interference processing can be carried out on the local part, for example, only the display content of the position of the individual display unit needs to be subjected to the interference display.

Further, as shown in fig. 8, the internal components of the display controller 2 in fig. 1 are shown, and it can be seen that the display controller includes a CPU module, a first screen display processing module, a first screen display control module, a second screen display processing module, and a second screen display control module. The display data source is data such as images and videos to be displayed, and the first image display processing module performs adaptive processing on the display data from the display data source, so that the display data meet the specification of the LED display screen, for example, the display data source has pixels 1028 × 764, and the display specification of the LED display screen is 800 × 600, so that the resolution of the display data source needs to be reduced, and the display specification of the LED display screen is adapted. The first image display control module correspondingly controls and distributes the display data from the first image display processing module to the LED display arrays corresponding to the first grating bars in the LED display screen, and controls the corresponding display physical parameters such as frame frequency, brightness, data rate and the like, so that the LED display arrays corresponding to the first grating bars can normally display the content of the first image. The first image display control module correspondingly performs the translation, rotation and/or random combination and the like on the display data from the first image display processing module to generate corresponding second image display data, and the second image display control module controls and distributes the display data to the LED display arrays corresponding to the second grating bars in the LED display screen and controls corresponding display physical parameters such as frame frequency, brightness, data rate and the like, so that the LED display arrays corresponding to the second grating bars can normally display the content of the second image synchronously with the first image. The CPU module realizes the control of the modules.

Further, when the display screen displays the dynamic video, the image frame displayed by the second picture is the image frame of the first picture after the time delay. That is, when the display data source is a dynamic video, the second image display processing module processes the display data from the first image display processing module, and further includes performing a delay buffering process on the image frames, and outputting the delayed image frames as second image content to be mixed with the current frame image content of the first image, for example, the image frame currently output by the first image display processing module is ZX3, before which there have been image frames ZX2 and ZX1 output, and the second image display processing module performs a delay two-image frame process, at which time the second image display processing module outputs image frame ZX1, so that the display content of image frame ZX1 is mixed with the display content of image frame ZX3 displayed by the first image as second image display content. In this way, the second image display processing module only needs to perform delayed output, and does not need the above-mentioned various translation and rotation processing processes, so that the processing speed can be faster and more timely. Of course, the first frame may be further combined with the above translation and rotation processing, that is, the delayed frame may be further subjected to translation and rotation processing and then output as the second frame.

The above technical means is mainly protection processing performed in a signal processing layer, generation of the second picture is closely related to the first picture, and the second picture is generated after the display signal of the first picture is spatially redistributed by the display controller. In order to achieve better display security protection, the first picture may be further subjected to information level identification and analysis by combining display modes, such as static display (image-text display) and dynamic display (video display), and displayed information content, and then subjected to targeted scrambling processing on sensitive information therein.

Preferably, after receiving the display data from the first screen display processing module, the second screen display processing module in the display controller first performs display morphology analysis, i.e. distinguishes between a static image and a dynamic video, where the static image refers to the same image displayed within a certain time range, such as within several seconds or several minutes, which is often the case when the courseware content is played in the lecture seat. Dynamic video refers to playing different image frames according to a certain frame rate, so as to present continuous video motion, which is often the case when playing general video. Through the display form analysis, the second picture can be generated in a targeted manner, preferably, a plurality of different second pictures can be generated in different time periods during the presentation of the static image as the first picture, and the second pictures and the first picture are respectively mixed and played, so that the situation that the mixed interference effect of the individual second pictures is not ideal and the second pictures are used for a long time can be reduced. Preferably, for a dynamic video, when each frame of image of the dynamic video needs to be used as a first image, a second image is correspondingly generated, which requires that a second image display processing module has a very high processing speed to adapt to the requirement of rapidly generating the second image, so that through the display form analysis, the speed for generating the second image can be adapted to the form of the first image, thereby realizing the synchronization of the two images and generating a better mixed protection effect. In addition, in the case of a dynamic video, it is necessary to specifically consider the coordination between the frame rate of the video and the refresh rate of the display screen, and the effect of preventing shooting can be achieved by reducing the refresh rate of the display screen, which will be further described later.

Furthermore, the second image display processing module can perform recognition analysis on the optical characteristics of the display content of the first image, where the optical characteristics refer to optical characteristic parameters such as color and brightness corresponding to each display pixel. For example, the first screen YT0 in FIG. 5 is a color windmill with rich colors and bright display, and the backgrounds on both sides of the windmill are single dark black with single color and dark gray. Therefore, by performing identification analysis on the optical characteristics of the display content of the first picture, the boundary contour of the windmill can be identified according to the color and brightness parameters of the pixels, so that a forming area corresponding to the windmill, namely an area formed by the peripheral contour of the windmill, is obtained, the inside of the area is the windmill picture, and the outside of the area is a background area. When the two corresponding display content areas are identified, the two corresponding display content areas can be processed respectively, for example, the windmill display area is rotated to form the display content of the windmill area corresponding to the second picture, the background display area is translated to form the display content of the background area corresponding to the second picture, the display contents of the two areas are added and synthesized to correspond to the generated second picture, and a better scrambling protection effect can be obtained when the generated second picture is mixed with the first picture.

In this regard, as further explained in conjunction with fig. 9, as shown in fig. 9, where the first frame ZC0 is a frame image of a normally displayed still frame or moving video, it can be seen that the first frame ZC0 is divided into 6 shaped display regions corresponding to AX1, AX2, AX3, AX4, AX5 and AX6, and such region division is mainly recognition division based on the aforementioned optical characteristics. After the 6 shaped regions are divided, the above-mentioned translation, rotation and random combination processing may be performed for each shaped region, so as to obtain the display contents of the shaped display regions BX1, BX2, BX3, BX4, BX5 and BX6, and then further combine them into the second picture GR 0.

Preferably, when the first picture is a still picture or each frame image in a dynamic video is generated, the display regions of different pixel sizes may be divided, for example, regions with close colors may be divided as an independent region, or a region that does not change in consecutive frames in the video may be used as a background region and a region that changes may be used as a foreground region, when the second picture, i.e., an interference picture or an interference frame image, is generated. After such division of the display area, the interference display area in the second screen, which interferes with the display area in the first screen, is generated corresponding to the same display area mainly by using elements such as color and composition in the display area. Such area division is mainly based on the difference in picture contents such as color and composition.

Preferably, the scrambling anti-shooting processing is respectively carried out on a background area and a foreground area in the video, the background area is the same as the background area in a plurality of continuous video frames, so that the same interference display content is adopted for displaying in the background area, and when the display controller carries out display control, the same background interference content is used for displaying in the plurality of continuous video frames without independently carrying out background extraction and scrambling processing on each frame of video image, so that the workload of the display controller is favorably reduced. And for the foreground area, the foreground area can be processed in a targeted manner according to the size of the variable quantity in the front and rear frame images. Preferably, if the foreground area changes slowly and gradually, the interference display content corresponding to the same foreground area is selected to perform scrambling display on the slowly changing foreground area of the continuous frames of images, and then after several frames, the interference display content corresponding to another new foreground area is selected to perform scrambling display on the slowly changing foreground area of the next continuous frames of images. Preferably, if the foreground region is changed in a continuous and obvious changing process, the corresponding interference display content of the foreground region in each image frame is determined separately, and then when the display screen displays the interference display content, the corresponding interference display content of the second image is added into each image frame of the first image.

Preferably, when the first picture is a static picture or an image of each frame in a dynamic video, when an interference picture or an image of an interference frame in the second picture is generated, a network with a learning function formed by a convolutional neural network can be used for learning and training a large number of input images, so as to form an identification network with artificial intelligence characteristics, then the corresponding interference picture or image of the interference frame in the second picture can be automatically generated for the newly input first picture, that is, the static picture and each image of the frame, and then the display controller respectively controls the LED lamp where the first grating bar 11 is located to display the first picture and controls the LED lamp where the first grating bar 12 is located to display the second picture.

It should be noted that the region division in fig. 9 is performed based on an image of one frame in a normally displayed still picture or moving video, and is based on a region division result obtained by performing recognition analysis on an optical feature of the image. When the image is changed, the division can be identified according to the difference of the image. Unlike the division method of the embodiment shown in fig. 6, the division method of fig. 6 is applicable to each image frame because the processing method in fig. 6 is not divided based on recognition of image features or image contents, but only physical division of a display area, but the processing speed of the example shown in fig. 6 is more advantageous and the implementation method is simple and easy.

Preferably, each of the shape-forming regions may be further subdivided into a plurality of sub-regions, as shown in fig. 10, the shape-forming display region AX1 in fig. 9 is further subdivided into sub-regions AX11, AX12, AX13, AX14, AX15, and then the sub-region AX11 is translated up and down, the sub-region AX12 is translated left and right, the sub-region AX13 is translated left and right, and the sub-regions AX14 and AX15 are both translated symmetrically about the respective symmetry axes. Thereby correspondingly generating a shaped display area BX 1. By the further sub-area division and the translation processing, the area division with smaller granularity can be realized, thereby being beneficial to more finely realizing the scrambling processing.

Further preferably, the second screen display processing module can perform recognition analysis on information features of the display content of the first screen, where the information features refer to physical information embodied by the composition displayed in the screen, and the information features recognize, for example, human bodies, human faces, animal types, article types, and the like. As shown in fig. 11, a first image XR1 shows a plurality of persons, each of which is surrounded by a corresponding characteristic area, namely a rectangular frame and labeled person, and a plurality of bottles, which are also surrounded by a corresponding plurality of rectangular frames and labeled bottle. In a further first panel XD1, a plurality of animals are identified, each of which is surrounded by a corresponding rectangular box and is labelled elethant and zebra, respectively. Moreover, the display frame and the label description can also be dynamically tracked along with video playing, on the basis, scrambling processing can be performed on the identified information features in a targeted manner, scrambling processing can be performed only on sensitive information features concerned, and other information features are not required to be processed, for example, only a face is scrambled, or scrambling processing is performed on a computer display interface, character information, an equipment interface and the like in a picture, the scrambling processing can be directly performed on a first picture, or only the sensitive information features are processed to generate corresponding interference display content in a second picture after the sensitive information features concerned are identified from the first picture, and the second picture only displays the display area of the information features, and other areas do not perform interference display any more.

As schematically shown in fig. 12, when a computer display is identified in the image, only the scrambling process is required for the content displayed in the display, and the other display areas are not processed.

It is further preferred to incorporate the foregoing description of scrambling of the third and fourth rows of XS3 and 4 text symbols in FIG. 4. When the character symbol displayed is identified and analyzed by the information characteristic of the display content of the first picture, the method can specifically generate the interference content of the display area corresponding to the second picture through similar interference characters except for the translation and rotation processing method, namely, the display content of the second picture is not from the first picture but is generated specifically according to the identification of the information characteristic in the first picture. For example, the characters "good" in fig. 4 correspond to "you", the "upper" corresponds to "lower", the "to" correspond to "question", the "day" corresponds to "beauty", the "to" learn "corresponds to" hall ", and the" to "learn" corresponds to "shi". When the specific characters are identified on the first picture, the similar characters corresponding to the characters are directly called from the corresponding similar database to be used as the interference characters of the display area corresponding to the second picture.

Preferably, the display controller identifies the face in each frame of image in the still picture or in the dynamic video, and when the scrambling anti-shooting processing needs to be performed on the face region, the display controller may identify the face features, including the identification and judgment of the face type, the hair style, the skin color, and the facial features, then find the interference features corresponding to each facial feature on the basis, and then combine these interference features, so that the combination will generate significant interference on the normal face, for example, the skin color is close, that is, the skin black and white is close. The human face with higher similarity to the normal human face in the first picture can be found from the database to be used as the interference human face in the second picture, and the simulation reconstruction can be carried out on the basis of the normal human face in the first picture to realize the interference human face in the second picture. Then, the display controller controls the normal face in the first picture to be displayed through the LED lamp where the first grating bar 11 is located, and controls the interference face in the second picture to be displayed through the LED lamp where the first grating bar 12 is located.

Preferably, when the displayed text is displayed as a moving image, for example, the text of a caption displayed in the image, the display controller may directly recognize the display area of the caption, and then directly blur the text in the text display area or the caption display area corresponding to each frame image, thereby directly performing the interference processing on the text in the moving image and preventing the shooting.

It can be seen that based on the description of the embodiments in fig. 9 to fig. 12, the processing of the first screen further includes a recognition analysis based on optical features and information features in the screen, the recognition analysis can build a recognition model based on deep learning of a neural network, and the recognition model can modify a recognition object through training of a training set, for example, recognizing a human face, recognizing a specific object such as a computer display screen, and the like, thereby having the obvious feature of artificial intelligence. Therefore, key objects needing protection and areas where the key objects need protection can be identified, then interference data are further generated, the interference data can be used as interference data in a second picture after processing of corresponding parts of a first picture, and can also be generated in a targeted mode by constructing an interference database (such as interference on characters), simulating and synthesizing interference data (such as interference on faces and mosaic processing), and the like after identification of information characteristics, so that interference or a better protection effect can be achieved.

In addition, it should be emphasized that the foregoing method has no display influence on the first picture, the display content of the first picture can be clearly seen through the glasses, and the mixed content displayed on the whole display screen is captured by the image capturing device to obtain the scrambled picture. Of course, if there is a higher level information security protection requirement, the specific information feature in the first picture may also be scrambled, so that the first picture may also be partially presented as an interference feature, such as a human face, a character, a computer display interface, and the like.

Further, since the display controller can also set the refresh rate of the display screen, this approach is suitable for the anti-shooting protection of the dynamic video. The display controller further prevents the display screen from being shot by regulating and controlling the refresh rate of the display screen. Preferably, the display controller reduces the refresh rate of the display screen and controls the lower limit of the refresh rate close to the normal viewing of human eyes, so that the display of the image or the video does not affect the viewing of human eyes. However, for the shooting device, because the frame rate of the shooting device is higher or the shutter exposure time is shorter, that is, the shooting frame rate of the shooting device is greater than the refresh rate of the display screen, the shooting device shoots when the display screen does not completely display a frame of image, and thus a frame of incomplete image is shot, or a local image is shot, and the shooting prevention can be effectively performed in this way.

Specifically, a clear picture can be taken on the display screen only when the refresh rate of the ccd (charge coupled device) in the shooting device needs to be adapted to the refresh rate of the display screen. As shown in fig. 13, a first graph TS1 shows a refresh timing chart of a display panel, and a corresponding display period interval is represented by each display time T0, T1, T2, T3, etc., the reciprocal of the display period interval, i.e., T1-T0, is the refresh rate of the display panel, and each display period interval further includes a field scanning time interval Tx1 and a stable display time interval Tx2, which are not necessarily equal, but may be unequal. In the time interval Tx1 of line field scanning, the picture is in line field scanning state, only partially displays the picture content, and is a process of dynamically changing and displaying from incomplete picture to complete picture, after the time period is completed, the complete picture of the frame image is displayed, and the picture is displayed in the time interval Tx 2. Further, when the display screen is shot by the shooting device, the CCD therein also has a certain refresh rate, which corresponds to the second graph TS2 in fig. 13, which shows that the shooting cycle interval corresponding to the shooting device is represented by each time t0, t1, t2, t3, t4, etc., the reciprocal of the shooting cycle interval t1-t0 is the refresh rate of the shooting device, each shooting cycle interval further includes a shooting time interval tx1 and a storage time interval tx2, photosensitive recognition of the external image is completed in the shooting time interval tx1, which is also a dynamic process from incomplete to complete acquisition of the external image, and the shot image is stored in the storage time interval tx2, which are not necessarily equal. It can be seen that, on the second graph TS2, the images beginning to appear at the time T0 in the first graph TS1 cannot be obtained at the corresponding shooting times T0 and T1, because the shot pictures at the shooting times T0 and T1 are partially displayed pictures instead of full pictures in the duration of Tx1, and a full picture of one frame can be shot at the time T2. Similarly, on the second graph TS2, there also correspond to times t4, t5, t7, and t10, a complete image of one frame can be obtained, and t4 and t5 correspond to the same frame image, while the images captured at the times t0, t1, t3, t6, t8, t9, and t11 are all partial images.

Further, with respect to the third graph TS3, it is different from the second graph TS2 in the phase of time, that is, there is a deviation between the time t0 in the third graph TS3 and the time t0 in the second graph TS2, and when the display screen in the first graph TS1 is photographed at the corresponding time in the third graph TS3, it can be seen that a full picture can be photographed at the times t1, t4, t6, t7, t9, and a partial picture is photographed at the other times t0, t2, t3, t5, t8, t 10. Therefore, when the third graph TS3 and the second graph TS2 are compared, although the refresh rates of the two shots are the same, the difference in the time phase of the shots also causes a difference in the distribution of the shot results in time. Therefore, in order to photograph the display screen by the photographing device, it is necessary to make the two devices have good adaptation of the refresh rate and the time phase, which is difficult to be done in practice, because the refresh rate of the photographing device is usually a fixed or limited number of selectable values, and has a high refresh rate value, which is difficult to adapt to the display of the display screen with a low refresh rate.

Further, in fig. 13, for the fourth graph TS4, the shooting cycle intervals T0, T1, T2, T3 corresponding to the graphs are the same as the display cycle intervals T0, T1, T2, T3 corresponding to the first graph TS1, and the selection of the shooting times T0, T1, T2, T3 is just within the time interval Tx2 of stable display in the display cycle interval, so that at this time, good shooting of the display image can be obtained, and therefore, it is necessary to adapt the display refresh rate of the display screen in terms of shooting frequency and phase, which is a relatively ideal effect.

The fourth plot TS4 shows that the refresh rate of the shot is equal to the refresh rate of the display screen, and the shot with phase adaptation can obtain better continuous shot sharpness. In the case that the refresh rate of the shot displayed by the fifth graph TS5 is 2 times of the refresh rate of the display screen, however, due to the unreasonable time phase selection, no effective and complete shot can be obtained at each time of the fifth graph TS5, such as at each time t0, t1, t2, t3, and although the time t2 is within the time interval Tx2 of the stable display of the first graph TS1, since the shooting device is still within the shooting time interval Tx1 from the time t2, since the time staying in the time interval Tx2 of the stable display is short, no good shooting effect can be obtained. In the case where the refresh rate of the shooting displayed in the sixth graph TS6 is 2 times the refresh rate of the display screen, a better shooting effect can be obtained at times t1, t3, t5, and t7 because the time phase is selected reasonably.

As described above with reference to fig. 13, it can be seen that the display effect of the display screen can be better captured only when the refresh rate of the display screen is matched with the refresh rate of the shooting device and the corresponding time phase, otherwise, when the refresh rate of the display screen is low and the refresh rate of the shooting device is high, the shooting device is difficult to reduce the refresh rate to adapt to the refresh rate of the display screen, and there is randomness also in the shooting time phase, which results in that the shooting device cannot obtain a better shooting effect.

Furthermore, in order to prevent the shooting device from being able to recognize and track the refresh rate of the display screen and further synchronize the display of the display screen for shooting, the refresh rate of the display screen can be dynamically adjusted, so that the refresh rate of the display screen dynamically changes within an interval range, and the shooting device is difficult to recognize and track.

As shown in fig. 14, this is to obtain a defective shot picture by shooting the display screen by the shooting device, and it can be seen that there are a plurality of black stripes in the shot picture, and these black stripes are generated because the refresh rate of the whole display screen is set to be low, and the frame rate of shooting by the shooting device is high, so that the whole display screen does not display a complete image frame in a short shooting time range. However, such a picture can be completely seen when observed by human eyes, because human eyes have a visual retention effect, and the reaction time is not as sensitive and fast as that of a shooting device.

Preferably, the refresh rate of the display screen is set at 24-30FPS, i.e. 24-30 frames of images per second, so that when the frame rate of the shooting by a shooting device such as a mobile phone is 60FPS, only half of the displayed images of the display screen can be shot normally during shooting.

Preferably, when the display screen decreases the refresh rate of the display, the display controller is also required to perform applicability adjustment on the frame rate of the video displayed on the first screen, that is, the frame rate of the video and the refresh rate of the display screen are kept synchronous and consistent, and redundant video frames in a unit time are reasonably discarded, so that the continuity of the video display is ensured.

Preferably, the method for frame rate reduction transformation of the original video when the video is played on the display screen includes that the method is implemented by discarding partial frames and recombining the video, for example, discarding 30 frames per second of images, discarding 1 frame every few frames, and recombining the remaining 25 frames into 1 second of video. For example, 30 frames per second of pictures, of which frames 5, 11, 17, 23, 29 are decimated and discarded, no longer appear in the newly composed video.

Preferably, the frame rate reduction and transformation method may further include performing transparent overlap-merge on two adjacent frames, and performing a transition process similar to translucency on the two adjacent frames, that is, performing overlap-merge on two adjacent frames according to different transparent proportions, and re-rendering the two adjacent frames into a new frame.

Preferably, the frame rate reduction conversion method may also be a speed reduction conversion, which is a slow-playing method, that is, playing 30 frames per second is changed to playing 25 frames, but the next 5 frames are not discarded, but are put into the next second, the original 1 second video is changed into 1 second plus 200 milliseconds, and since the video per second is slowed down, the audio is also adjusted accordingly, so that the sound and picture synchronization can be ensured.

It should be noted that, by reducing the refresh rate of the display screen, the method can be used in combination with the shooting prevention method, so that the display security protection effect can be further enhanced.

Therefore, the invention discloses a grating type screen display system for information security protection. The system comprises a display screen, a display controller and grating glasses, wherein first grating strips and second grating strips are adhered to the display screen at intervals, a first picture only displays LED lamp beads adhered to all the first grating strips correspondingly, a second picture is displayed on the LED lamp beads adhered to all the second grating strips correspondingly, and the second picture is a scrambled picture of the first picture; two lenses of the grating glasses can only receive the first picture and simultaneously shield the second picture, so that the display content of the first picture can be seen through the grating glasses. The system realizes normal watching through the grating glasses, the scrambled pictures are obtained when the shooting equipment shoots the display screen, and various different scrambling effects can be realized through various modes, so that the system is suitable for various application scenes.

Based on the same conception, the invention provides an embodiment of a grating type screen display method for information security protection.

Fig. 15 is a flowchart of an embodiment of a raster-type screen display method for information security protection according to the present invention, which includes the following steps:

a screen display S10, wherein a first grating bar and a second grating bar are pasted on the LED display array of the display screen at intervals, the first grating bar and the second grating bar respectively change the vibration direction of the light emitted by the LED, and the two vibration directions are opposite after the change; only the LED lamp beads correspondingly adhered to all the first grating strips are correspondingly displayed on a first picture to be displayed through a display controller, and second pictures are displayed on the LED lamp beads correspondingly adhered to all the second grating strips; taking the content displayed by the second picture as interference to the first picture, so that the picture displayed by the whole LED display array is a scrambled picture mixed with the first picture and the second picture;

s20 is watched by wearing glasses, the display screen is watched through the grating glasses, two lenses of the grating glasses are all corresponding and only can receive and penetrate through the first picture corresponding to the LED light of the first grating strip, and meanwhile, the second picture corresponding to the LED light of the second grating strip is shielded, so that the first picture display content is seen through the grating glasses.

Preferably, in the screen display S10, the first grating bars and the second grating bars are arranged horizontally or vertically at intervals.

Preferably, in the screen displaying S10, the display content of the second picture is obtained by translating, rotating and/or randomly combining the display content of the first picture.

Preferably, in the screen display S10, the entire first screen is divided into a plurality of sub-screens, and the sub-screens in the first screen are respectively subjected to a shift, rotation, or random combination process, thereby generating the second screen display content.

Preferably, in the screen display S10, when the display screen displays the dynamic video, the image frame displayed by the second picture is the image frame of the first picture after the delay.

Preferably, in the screen display S10, the display controller performs display morphology analysis on the display data to distinguish between a still image and a moving image.

Preferably, in the screen display S10, the display controller performs recognition analysis on the optical characteristics of the first screen display content, performs shape-forming display area division on the first screen display content, and performs translation, rotation, and random combination processing on each shape-forming area to generate the second screen display content correspondingly.

Preferably, in the screen displaying S10, the display controller performs recognition analysis on the information features of the display content of the first picture to obtain a feature region corresponding to the sensitive information features in the first picture, and generates the display content of the corresponding display region of the second picture after scrambling the feature region.

Preferably, in the screen display S10, when the first screen display content includes a character symbol, a character symbol similar to the character symbol is generated as the display content of the second screen correspondence display area.

Preferably, in the screen display S10, the display controller reduces the refresh rate of the display screen and controls the lower limit of the refresh rate near the lower limit of the refresh rate normally viewed by human eyes.

The method comprises the steps that first grating strips and second grating strips are pasted on a display screen at intervals, a first picture only displays LED lamp beads pasted correspondingly to all the first grating strips correspondingly, a second picture is displayed on the LED lamp beads pasted correspondingly to all the second grating strips, and the second picture is a scrambled picture of the first picture; two lenses of the grating glasses can only receive the first picture and simultaneously shield the second picture, so that the display content of the first picture can be seen through the grating glasses. The method realizes normal watching through the grating glasses, the scrambled picture is obtained when the shooting equipment shoots the display screen, and various different scrambling effects can be realized through various modes, so that the method is suitable for various application scenes.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.

Claims

1. A raster screen display system for information security protection, comprising: the display screen comprises an LED display array, a first grating strip and a second grating strip are adhered to the LED display array at intervals, the first grating strip and the second grating strip respectively change the vibration direction of light emitted by the LED, and the two changed vibration directions are opposite; the display controller only displays the LED lamp beads correspondingly adhered to all the first grating strips correspondingly to a first picture to be displayed, and displays a second picture on the LED lamp beads correspondingly adhered to all the second grating strips, and the displayed content of the second picture is taken as interference to the first picture, so that the picture displayed by the whole LED display array is a scrambled picture mixed with the first picture and the second picture;

correspondingly, two lenses of the grating glasses correspond to first pictures which can only receive and penetrate through the LED light of the first grating strip, and simultaneously, the two lenses of the grating glasses are used for shielding second pictures which correspond to the LED light of the second grating strip, so that the first picture display contents can be seen through the grating glasses.

2. A raster screen display system for information security protection according to claim 1, wherein the first and second raster strips are arranged horizontally at intervals, vertically at intervals or in a checkerboard pattern.

3. A raster screen display system for information security protection according to claim 1, wherein the display content of the second screen is obtained by translating, rotating and/or randomly combining the display content of the first screen.

4. The raster screen display system for information security protection according to claim 1, wherein the entire first screen is divided into a plurality of sub-screens, and the second screen display content is generated after the sub-screens in the first screen are respectively translated, rotated or randomly combined.

5. The raster screen display system for information security protection according to claim 1, wherein when the display screen displays dynamic video, the image frame displayed by the second picture is the image frame of the first picture after time delay.

6. A raster screen display system for information security protection according to claim 1, wherein the display controller comprises a display modality analysis of the display data to distinguish between still images and moving video.

7. The system of claim 1, wherein the display controller performs recognition analysis on optical characteristics of the first screen display content, performs shape-forming area division on the first screen display content, and generates the second screen display content after performing translation, rotation, and/or random combination processing on each shape-forming area.

8. The raster screen display system for information security protection according to claim 1, wherein the display controller performs recognition analysis on the information features of the display content of the first screen to obtain a feature area corresponding to the sensitive information features in the first screen, and generates the display content of the corresponding display area of the second screen after scrambling the feature area.

9. The raster screen display system for information security protection according to claim 1, wherein when the first screen display content includes text symbols, text symbols similar to the text symbols are correspondingly generated as the display content of the second screen corresponding display area.

10. The raster screen display system for information security protection according to claim 1, wherein the display controller further prevents the display screen from being shot by regulating a refresh rate of the display screen.