EP2710581B1 - System pour la mettre en place des informations privées sûr un affichage - Google Patents

System pour la mettre en place des informations privées sûr un affichage Download PDF

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Publication number
EP2710581B1
EP2710581B1 EP11722374.3A EP11722374A EP2710581B1 EP 2710581 B1 EP2710581 B1 EP 2710581B1 EP 11722374 A EP11722374 A EP 11722374A EP 2710581 B1 EP2710581 B1 EP 2710581B1
Authority
EP
European Patent Office
Prior art keywords
display
frame sequence
image signal
type
original image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11722374.3A
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German (de)
English (en)
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EP2710581A1 (fr
Inventor
Ruiz Rodriguez Ezequiel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Naxos Finance SA
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Naxos Finance SA
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Publication date
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Publication of EP2710581A1 publication Critical patent/EP2710581A1/fr
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Publication of EP2710581B1 publication Critical patent/EP2710581B1/fr
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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G09G5/39—Control of the bit-mapped memory
    • G09G5/395—Arrangements specially adapted for transferring the contents of the bit-mapped memory to the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0435—Change or adaptation of the frame rate of the video stream
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/12—Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/14—Solving problems related to the presentation of information to be displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2358/00—Arrangements for display data security
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/18—Use of a frame buffer in a display terminal, inclusive of the display panel

Definitions

  • the present invention relates to a system for providing private viewing of multimedia contents of a display according to the preamble of claim 1.
  • one of said systems comprises a display provided with a sort of shield that allows to restrict viewing of the display only to those positioned exactly in axis with said display; however, this system is not secure, since it cannot prevent viewing the display by a person positioned behind the user.
  • a second system provides to utilize an LCD display from which a polarizing layer has been removed, in order to render the display invisible to those don't wearing polarized glasses; however this system is not versatile, since it is only apt to be used on the LCD displays.
  • Another system for providing private viewing of multimedia contents of a display foresees to combine, to a first image having a certain wavelength, a second image having a different wavelength; the use of narrow-band filtered glasses allows to see the first image in a proper way.
  • this system has many drawbacks, and in particular it allows to anyone wearing said narrow-band filtered glasses to see the multimedia content displayed on the display.
  • a further system for providing private viewing of multimedia contents of a display provides to introduce some mask pattern or masking text characters into a sequence of images, and to intercept the disturbing image through the use of LCD shutter glasses; this system requires the use of an additional light screen, that inevitably implies the consumption of additional power.
  • the original image signal comprises Red, Green and Blue colour data components; each of said RGB colour data components is transmitted from the image signal generator to signal modifying means, where it is mixed or multiplexed on a pixel-by-pixel basis with at least one corresponding modifying (inverse and/or complementary) colour data component thereof.
  • Such a mixing or multiplexing is done at such a frequency that the human brain only interprets the composition of original colour components and modifying (inverse and/or complementary) colour components generated thereby as a single compound mixed image, which is substantially neutral and featureless.
  • a sync control element is associated both to the signal modifying means, both to special eyewear, in order to decode and extract the original image from the single compound mixed image; preferably, said special eyewear comprises time-synchronized LCD shutters, variable polarizers or similar synchronized filters, that selectively block the modifying (inverse and/or complementary) colour components of the resulting compound mixed image, thus allowing only the original image to pass.
  • the frequency of the original image signal representative of an original image to be displayed is reduced of the 50%, with the consequent introduction of visible display flicker, which is very annoying and disturbing for a user.
  • the display of motion pictures and scenes does not result in a motion depiction in which the depicted objects move smoothly and correctly, but said display of motion pictures is jerky, not continuous and sometimes difficult to follow.
  • the original colour data components and the modifying (inverse and/or complementary) colour data components corresponding to each pixel are multiplexed alternately in time over the respective frame periods "n" and "n+1". It is therefore clear that, when the image relates to a motion picture or scene, the pixels of the frame period "n" are not the same of the pixels of the frame period "n+1". Thus, the pixels of the modifying image are not in the position to neutralize and obscure the pixels of the original image; it is therefore clear that this system is not secure and eclectic, since it cannot be used for providing private viewing of multimedia contents relating to motion pictures and scenes.
  • Another object of the present invention is to provide a system and a method for providing private viewing of multimedia contents of a display able to eliminate any display flicker and jerky images, in such a way to display an image of good quality.
  • reference numeral 1 designates as a whole a system for providing private viewing of multimedia contents of a display according to the present invention.
  • the system 1 according to the exemplary embodiment of the present invention comprises a display 2 comprising a plurality of pixels and an image signal generator 3 which generates an original image signal representative of an original image to be displayed on said display 2.
  • the original image signal comprises Red, Green and Blue colour data components, which are output from said image signal generator 3 along lines 31R, 31G and 31B respectively.
  • substantially all known video displays generate an image through the mixture of three primary colours of light, i.e. Red, Green and Blue, in particular by means of a plurality of pixels comprised in the display 2.
  • human eyes do not detect separately each Red, Green, Blue pixel comprised on the display 2, but a user viewing the display 2 will see a range of many colours combined to produce a desired image.
  • intensities of all Red, Green and Blue components of a given pixel are substantially the same, that pixel will produce a neutral white light.
  • Said system 1 further comprises signal modifying means 4 which mix, on a pixel-by-pixel basis, each original image signal transmitted from the image signal generator 3 with at least one corresponding modifying image signal component thereof, in order to generate a compound image signal representative of a compound image.
  • said signal modifying means 4 may mix each of said RGB colour data components (original colour data components) of the original image signal transmitted from the image signal generator 3 with at least one modifying (i.e. inverse and/or complementary) colour data component thereof.
  • two colours are called complementary if, when mixed in the proper proportion, for instance in a scale of 256 bits, they produce a neutral color (grey, white, or black).
  • an inverse colour is calculated by subtracting each component of an RGB colour from 255; therefore the result of the mixing, on a pixel-by-pixel basis, of an original image signal with a corresponding inverse image signal is a compound mixed image that appears substantially neutral and featureless.
  • said system 1 comprises extracting means 5 for extracting said original image from said compound image displayed on the display 2.
  • said extracting means 5 may provide for specialized eyewear comprising synchronized LCD shutter, polarizers, colour filters, or similar means apt to selectively block the inverse and/or complementary colour components of the compound mixed image, in such a way to allow only the extraction of the original image from said compound mixed image.
  • said system 1 comprises:
  • said memory 6 comprises:
  • Each portion 6R, 6G, 6B of memory 6 comprises two frame stores 6A and 6B, in particular a first frame store 6A and a second frame store 6B (see Fig. 2 , that represents a first portion 6R, 6G, 6B of the memory 6).
  • the two frame stores 6A and 6B work in a "flip-flop" manner, namely, if during frame n the first frame store 6A is written, the second frame store 6B is read; during frame n+1 the reverse happens, namely the first frame store 6A is read and the second frame store 6B is written.
  • the two frame stores 6A and 6B are read at a double speed, namely at a second speed 2FC corresponding to a speed which is the double of the speed of the clock frequency FC.
  • the output video reproduces the input video, with one frame delay and with each frame duplicated; thus, if the input video has a vertical frequency FV, the output video has a double vertical frequency 2FV, i.e. a period having a speed which is the double of the speed of the vertical frequency FV.
  • the output video can be considered as the interleaving of two frame sequences (identical to the input frame sequence, apart from the delay), respectively called "first and second type of frame sequences”.
  • said signal modifying means 4 comprise:
  • each multiplexer 41R, 41G, 41B of said plurality of first multiplexers 41R, 41G, 41B is respectively associated to said first 6R, second 6G and third portion 6B of the memory 6 by means of respective second lines 61R, 61G and 61B; therefore, each of said first multiplexers 41R, 41G, 41B is apt to receive said first and second type of frame sequences from said first 6R, second 6G and third portion 6B respectively.
  • each multiplexer 43R, 43G, 43B of said plurality of second multiplexers 43R, 43G, 43B is respectively associated to said display 2 by means of respective third lines 44R, 44G and 44B; therefore, said display 2 is apt to receive said first and third type of frame sequences from each of said second multiplexers 43R, 43G, 43B.
  • the relative display sequence may be represented as shown in Fig. 3 , that relates to the display sequence of the Red colour data component; however, it is clear that the display sequence of the Green and Blue colour data components will have a totally similar behaviour of the Red colour data component represented in Fig. 3 .
  • Fig. 3 it is shown that the input side (indicated in line 1 of Fig. 3 with the reference 6R-IN and in line 2 of Fig. 3 with the references 31R or 6R-IN) of the first portion 6R receives a Red colour data component of the original image signal at a first speed FC corresponding to a clock frequency, and records at least an original frame sequence (indicated in line 2 of Fig. 3 with references N, N+1, N+2, ).
  • Duplicating element 7 reads said first portion 6R of the memory 6 at a second speed 2FC corresponding to a speed which is the double of the speed of said clock frequency FC, in such a way to duplicate said original frame sequence (N, N+1, N+2) and to obtain, at the output (indicated in line 4 of Fig. 3 with reference 6R-OUT) of the first portion 6R, a sequence containing a first type of frame sequence (designated in Fig. 3 as 2N, 2(N+1), 2(N+2), 7) and a second type of frame sequence (designated in Fig. 3 as 2N', 2(N'+1), 2(N'+2), 7), in particular in a period corresponding to a Vertical Frequency FV.
  • Said first [2N, 2(N+1), 2(N+2)] and second type of frame sequence [2N', 2(N'+1), 2(N'+2)] have the same content of the original frame sequence (N, N+1, N+2); in particular, said second type of frame sequence [2N', 2(N'+1), 2(N'+2)] is outputted from said first portion 6R of the memory 6 by the duplicating element 7 with a delay of a period corresponding to a double Vertical Frequency 2FV with respect to said first type of frame sequence [2N, 2(N+1), 2(N+2)], i.e. of a period having a speed which is the double of the speed of the original Vertical Frequency FV (see line 3 of Fig. 3 ).
  • said first [2N, 2(N+1), 2(N+2)] and second type of frame sequence [2N', 2(N'+1), 2(N'+2)] substantially correspond to said original frame sequence (N, N+1, N+2) and are obtained by the duplicating element 7, that reads said first portion 6R of the memory 6 at a second speed 2FC that corresponds to the double of the speed of said clock frequency FC
  • the first multiplexer 41R is controlled at a speed corresponding to said double Vertical Frequency 2FV and deviates:
  • Said complementing circuit 42R transforms said second type of frame sequence [2N', 2(N'+1), 2(N'+2)] producing a third type of frame sequence (designated in Fig. 3 as 2N*, 2(N*+1), 2(N*+2), 7) corresponding to a modifying (i.e. inverse and/or complementary) colour data component of the Red colour data component received from the first multiplexer 41R.
  • said complementing circuit 42R produces an inverse colour data component, subtracting from the level 255 the Red colour data component received from the first multiplexer 41R; in other words, the complementing circuit 42R executes the complement at 255 of the sequence of all the Red colour data components received at 8 bits related to the second type of frame sequence [2N', 2(N'+1), 2(N'+2)], in order to produce a third type of frame sequence [2N*, 2(N*+1), 2(N*+2)] representative of an inverse colour data component, corresponding to a modifying image signal.
  • the second multiplexer 43R is controlled at a speed corresponding to said double Vertical Frequency 2FV and deviates both the first type of frame sequence [2N, 2(N+1), 2(N+2)] and both the third type of frame sequence [2N*, 2(N*+1), 2(N*+2)] toward an output side (designated in line 8 of Fig.
  • the second multiplexer 43R is controlled in such a way that said third type of frame sequence [2N*, 2(N*+1), 2(N*+2)] is deviated toward the display 2 with a delay of a period corresponding to a double Vertical Frequency 2FV with respect to said first type of frame sequence [2N, 2(N+1), 2(N+2)].
  • the duplicating element 7 receives an Horizontal Frequency FH from the image signal generator 3, and sends to the display 2 a second Horizontal Frequency 2FH having a frequency which is the double of the frequency of said Horizontal Frequency FH.
  • said extracting means 5 are associated with the duplicating element 7, in particular through a control line 51; thus, the shutter speed of the extracting means 5 is synchronized with the mixing speed imparted from said duplicating element 7, in particular said mixing speed corresponding to a double Vertical Frequency 2FV.
  • the manner to synchronize the shutter speed of the extracting means 5 may be of various type; for instance using a wireless connection based on infrared technology or radio ones, like the Bluetooth.
  • said extracting means 5 allow the passage only of the first type of frame sequence [2N, 2(N+1), 2(N+2)] that has the same content and the same repetition speed (for example, 50Hz) of the original frame sequence (N, N+1, N+2); therefore, thanks to the provisions of the present invention, it is possible to maintain unaltered (without any display flicker and jerky images) the content of multimedia contents, even if said contents relate to motion pictures and scenes.
  • said extracting means 5 may comprise input means (not shown in Fig. 1 ) for inputting an access code prior to use, in such a way to further enhance the security level of the system 1.
  • system and method according to the present invention are conceived in a manner to be versatile and eclectic, since they are apt to be used in each type of screen or display and also for providing private viewing of multimedia contents relating to motion pictures and scenes.
  • the system and the method according to the present invention allow to display an image of good quality.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Claims (1)

  1. Système (1) qui permet le visionnage privé de contenus multimédias, dans lequel ledit système (1) comprend :
    - un afficheur (2) comprenant une pluralité de pixels ;
    - un générateur de signal d'image (3) qui génère un signal d'image originale représentatif d'une image originale à afficher sur ledit afficheur (2), dans lequel ledit signal d'image originale comprend des composantes de données de couleur rouge, verte et bleue ;
    - des moyens de modification de signal (4) qui produisent une image modifiée en commençant avec ladite image originale ;
    - des moyens d'extraction (5) pour extraire ladite image originale de ladite image composite affichée sur l'afficheur (2) ;
    caractérisé en ce que
    ledit système (1) comprend en outre :
    - une mémoire (6) capable de recevoir et d'enregistrer une séquence de trames originales (N, N+1, N+2) correspondant au signal d'image originale généré par ledit générateur de signal d'image (3) à une première vitesse (FC) correspondant à une fréquence d'horloge ;
    - un élément de duplication (7) capable de lire ladite mémoire (6) à une deuxième vitesse (2FC) correspondant à une vitesse qui est le double de ladite fréquence d'horloge (FC), dans lequel ledit élément de duplication (7) est capable de dupliquer ladite séquence de trames originales (N, N+1, N+2) afin d'envoyer, aux dits moyens de modification de signal (4), un premier type (2N, 2(N+1), 2(N+2)) et un deuxième type (2N', 2(N'+1), 2(N'+2)) de séquence de trames ;
    - dans lequel lesdits moyens de modification (4) :
    - mélangent, sur une base pixel par pixel, chaque signal d'image originale transmis par le générateur de signal d'image (3) avec au moins une composante de signal d'image modifiée correspondante de celui-ci, afin de générer un signal d'image composite à envoyer au dit afficheur (2) ;
    - comprennent .
    - une pluralité de premiers multiplexeurs (41R, 41G, 41B), dans lequel chacun desdits premiers multiplexeurs (41R, 41G, 41B) est capable de recevoir lesdits premier et deuxième types de séquences de trames de l'une desdites composantes de données de couleur rouge, verte et bleue ;
    - une pluralité de circuits complémentaires (42R, 42G, 42B), dans lequel chacun desdits circuits complémentaires (42R, 42G, 42B) est associé à un premier multiplexeur (41R, 41G, 41B) respectif pour élaborer ledit deuxième type de séquence de trames et produire un troisième type de séquence de trames correspondant à une composante de données de couleur modifiée (c'est-à-dire, inverse et/ou complémentaire) ;
    - une pluralité de deuxièmes multiplexeurs (43R, 43G, 43B), dans lequel chacun desdits deuxièmes multiplexeurs (43R, 43G, 43B) est associé à un premier multiplexeur (41R, 41G, 41B) respectif pour recevoir ledit premier type de séquence de trames, et à un circuit complémentaire (42R, 42G, 42B) respectif pour recevoir ledit troisième type de séquence de trames, afin d'envoyer, à l'afficheur (2), une image mélangée composite qui est représentative desdits premier et troisième types de séquences de trames et qui s'avère être sensiblement neutre et sans caractéristique.
EP11722374.3A 2011-05-19 2011-05-19 System pour la mettre en place des informations privées sûr un affichage Active EP2710581B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/058181 WO2012155983A1 (fr) 2011-05-19 2011-05-19 Système de visualisation privée de contenus multimédia d'un affichage et son procédé

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EP2710581A1 EP2710581A1 (fr) 2014-03-26
EP2710581B1 true EP2710581B1 (fr) 2017-08-30

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CN105657409A (zh) * 2016-01-27 2016-06-08 京东方科技集团股份有限公司 一种显示屏、眼镜、显示系统及播放方法
CN112969080B (zh) * 2021-02-24 2023-06-06 厦门物之联智能科技有限公司 一种图像处理方法、系统、设备和存储介质

Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2006196995A (ja) * 2005-01-11 2006-07-27 Matsushita Electric Ind Co Ltd ３次元めがね視聴検知

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WO2008152932A1 (fr) * 2007-06-13 2008-12-18 Nec Corporation Dispositif d'affichage d'image, procédé d'affichage d'image et programme d'affichage d'image

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2006196995A (ja) * 2005-01-11 2006-07-27 Matsushita Electric Ind Co Ltd ３次元めがね視聴検知

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ES2654200T3 (es) 2018-02-12
EP2710581A1 (fr) 2014-03-26

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