WO2010071193A1 - ディスプレイシステム、制御装置、表示方法およびプログラム - Google Patents
ディスプレイシステム、制御装置、表示方法およびプログラム Download PDFInfo
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- WO2010071193A1 WO2010071193A1 PCT/JP2009/071104 JP2009071104W WO2010071193A1 WO 2010071193 A1 WO2010071193 A1 WO 2010071193A1 JP 2009071104 W JP2009071104 W JP 2009071104W WO 2010071193 A1 WO2010071193 A1 WO 2010071193A1
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- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
- G06F3/1431—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display using a single graphics controller
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- 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
- G09G3/3659—Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/398—Synchronisation thereof; Control thereof
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0237—Switching ON and OFF the backlight within one frame
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
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- 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
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- 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
- G09G2320/0252—Improving the response speed
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- 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
- G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
- H04N13/341—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N2013/40—Privacy aspects, i.e. devices showing different images to different viewers, the images not being viewpoints of the same scene
- H04N2013/403—Privacy aspects, i.e. devices showing different images to different viewers, the images not being viewpoints of the same scene the images being monoscopic
Definitions
- the present invention relates to a display system, a control device, a display method, and a program.
- flat panel displays such as liquid crystal displays and plasma displays have been widely applied from mobile devices such as mobile phones to large devices such as public displays.
- Some mobile phones in recent years are equipped with an optical shielding plate (louver) and a display that can display the display content only from a specific direction. As described above, since the other person who is almost directly opposite the display can see the displayed data, it is not sufficient from the viewpoint of maintaining confidentiality.
- Patent Document 1 Japanese Patent Laid-Open No. 63-31788 (hereinafter referred to as Patent Document 1). )reference).
- the image display device disclosed in Patent Document 1 is an image that can be viewed only by a user wearing glasses having an image selection function (hereinafter referred to as a secret image) and a person who is not wearing the glasses. Other possible images (hereinafter referred to as public images) are displayed.
- an image display device disclosed in Patent Document 1 includes an image information storage memory 402, a synthesis circuit 405, a saturation / luminance conversion circuit 406, an image display 408, a spectacle shutter timing generation circuit 409, and spectacles. 411.
- the image information storage memory 402 stores the input image signal 401 in units of frames based on the frame signal 403.
- the image signal stored in the image information storage memory 402 is read twice in a frame cycle.
- the image signal read out first is supplied to the synthesis circuit 405 as the first image signal 404 compressed by 1/2.
- the image signal read out for the second time is subjected to saturation and luminance conversion processing by the saturation luminance conversion circuit 406 and then supplied to the synthesis circuit 405 as the second image signal 407.
- the output of the synthesis circuit 405 is supplied to the image display 408 as a display signal.
- the image display unit 408 alternately displays an image based on the first image signal 404 and an image based on the second image signal 407.
- the spectacle shutter timing generation circuit 409 generates a spectacle shutter drive signal 410 for driving the shutter included in the spectacles 411 based on the frame signal 403.
- the eyeglass shutter drive signal 410 is a timing signal that turns on the shutter of the eyeglasses 411 during a period in which an image based on the second image signal 407 is displayed.
- the shutter of the glasses 411 is driven based on the glasses shutter drive signal 410 output from the glasses shutter timing generation circuit 409, so that the user wearing the glasses 411 visually recognizes only the image based on the first image signal 404. To do.
- This gray image is an image completely different from the image based on the first image signal 404. Therefore, a person who does not wear the glasses 411 cannot visually recognize an image based on the first image signal 404.
- the image display of each image display device switches and displays images at mutually independent frequencies (frame rates) and phases.
- the glasses provided for each image display are controlled to be turned on / off in synchronization with the display cycle of the corresponding image display.
- a user of an image display device may display an image displayed on the image display device of another image display device through the glasses worn by the user.
- a secret image, a public image, or a mixed image thereof is perceived at a certain period. Such a perceived image is perceived as flicker that is very disturbing to the viewer.
- An object of the present invention is to provide a display system, a control device, a display method, and a program that solve the above-described problems.
- a display system corresponding to each of a plurality of terminals that display images, a control device that controls display of the images on the plurality of terminals, and the plurality of terminals.
- a plurality of optical shutters configured to transmit incident light during a period in which the image is displayed on a corresponding terminal, and to block incident light during other periods.
- the control device controls the plurality of terminals so that the images are not simultaneously displayed on the plurality of terminals.
- control device of the present invention includes a communication unit that communicates with each of a plurality of terminals that display an image according to an input display timing signal, a display control unit that controls display of the image on the plurality of terminals, Have The display control unit determines a display timing of the image for each of the plurality of terminals so that the image is not simultaneously displayed on the plurality of terminals, and a signal including the determined display timing is represented by the display timing signal. To each of the plurality of terminals through the communication unit.
- the display method of the present invention is provided corresponding to each of a plurality of terminals that display images, a control device that communicates with the plurality of terminals, and the plurality of terminals, and communicates with the corresponding terminals.
- a display timing signal including the determined display timing is transmitted to each of the plurality of terminals, and each of the plurality of terminals displays the image according to the display timing signal received from the control device,
- a synchronization signal indicating the display period of the image is transmitted to the corresponding optical shutter, and each of the plurality of optical shutters corresponds. That according to the synchronization signal received from the terminal, so as to switch the state to shield the incident light and a state that transmits incident light.
- the program of the present invention is a program of a control device capable of communicating with each of a plurality of terminals that display an image in accordance with an input display timing signal, and for each of the plurality of terminals, the image is the plurality of the plurality of terminals. Processing for determining the display timing of the image so as not to be simultaneously displayed on the terminal, and processing for transmitting a signal including the determined display timing to each of the plurality of terminals as the display timing signal, To run on a computer.
- FIG. 1 shows an example of a structure of a general image display apparatus. It is a block diagram which shows the structure of the display system which is the 1st Embodiment of this invention. It is a figure for demonstrating an example of the exclusive display control of the display system shown in FIG. It is a block diagram which shows the structure of the display control part of the display system shown in FIG. It is a figure for demonstrating an example of the exclusive display control of the display system which is the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the display system which is the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the display system which is the 3rd Embodiment of this invention.
- FIG. It is a schematic diagram which shows the 2nd example of operation
- FIG. 2 is a block diagram showing the configuration of the display system according to the first embodiment of the present invention.
- the display system includes a plurality of display terminals 1-1 to 1-4, optical shutters 2-1 to 2-4, and a display control device 3.
- Each of the display terminals 1-1 to 1-4 has display units 12-1 to 12-4 for displaying an arbitrary image, and can perform time-division display of a plurality of images.
- Each of the display terminals 1-1 to 1-4 may be, for example, a terminal having a display unit in the apparatus body such as a notebook personal computer, or a terminal in which the display unit is provided separately from the apparatus body, such as a desktop personal computer. But you can. Moreover, although the number of display terminals is four in FIG. 2, it is not limited to this. There may be a plurality of display terminals.
- the display terminals 1-1 to 1-4 and the display control device 3 are connected so as to communicate with each other.
- the connection method between the display terminals 1-1 to 1-4 and the display control device 3 may be a wired connection method such as a network cable or USB (Universal Serial Bus), or a wireless LAN (Local Area Network) or Bluetooth (registration).
- a wireless connection method such as a trademark may be used.
- the network to which the display terminals 1-1 to 1-4 and the display control device 3 are connected is arbitrary, and may be, for example, a LAN or a WAN (Wide Area Network).
- the display terminals 1-1 to 1-4 and the optical shutters 2-1 to 2-4 correspond one-to-one, and the corresponding display terminals and the optical shutter are connected so as to communicate with each other.
- the display terminal 1-1 and the optical shutter 2-1 are connected to be communicable.
- Each of the optical shutters 2-1 to 2-4 is a shutter for viewing the secret image SR displayed on each of the display terminals 1-1 to 1-4.
- the optical shutter 2-1 is a shutter for viewing the secret image SR displayed on the display terminal 1-1.
- the secret image SR is an image that can be viewed only by a user wearing optical shutters 2-1 to 2-4 that operate according to synchronization signals transmitted from the display terminals 1-1 to 1-4, respectively.
- the secret image SR is an image including secret information (predetermined content) such as personal information.
- the optical shutters 2-1 to 2-4 may be in a form that can be worn by the user, such as glasses or goggles, or may be in the form of a card.
- the display control device 3 is a control device that controls the display timing of images displayed on the display units 12-1 to 12-4 of the display terminals 1-1 to 1-4.
- the display control device 3 displays a secret image SR displayed on a display terminal other than the display terminal used by the user of each of the display terminals 1-1 to 1-4.
- the display timing at which the secret image SR, the reverse image RV, and the public image PB are displayed on each of the display terminals 1-1 to 1-4 is controlled so that it cannot be visually recognized. This control is hereinafter referred to as exclusive display control.
- one frame includes five subframes.
- Each of the display terminals 1-1 to 1-4 displays the secret image SR, the reverse image RV, and the public image PB in one frame. However, the display timing of the secret image SR on each of the display terminals 1-1 to 1-4 is different.
- the reverse image RV is an image for canceling the secret image SR displayed in the same frame.
- Public image PB is an image that can be seen by those who are not wearing optical shutters 2-1 to 2-4.
- the display terminal 1-1 has the secret image SR, the public image PB, the public image PB, the public image PB, the public image PB, The display terminal 1-2 performs display in the order of the reverse image RV, and the display terminal 1-2 performs display in the order of the public image PB, the secret image SR, the public image PB, the public image PB, and the reverse image RV.
- the public image PB, the public image PB, the secret image SR, the public image PB, and the reverse image RV are displayed in this order.
- the display terminal 1-4 displays the public image PB, the public image PB, the public image PB, the secret image SR, and the reverse image. Display is performed in the order of the image RV.
- subframes in which the public image PB is continuous for example, the second subframe, the third subframe, and the fourth subframe displayed on the display terminal 1-1). Since it is sufficient that the public image PB is displayed during this period, the image rewriting is not necessarily performed in units of subframes.
- the display terminal is a pulse emission type display such as a CRT (Cathode Ray Tube) display or an organic EL (Electro Luminescence) display, it is written (redrawed) in subframe units to reduce image flickering. It is desirable.
- the display terminal is a hold-type display device such as a liquid crystal display, the image is held once the image is written.
- the frequency at which the secret image SR, the reverse image RV, and the public image PB shown in FIG. 3 are sequentially displayed is such that when the user views the images, the images are visually merged in time.
- the frequency of the frame is preferably 60 Hz or more
- the frequency of the subframes for displaying the secret image SR, the inverted image RV, and the public image PB is preferably 180 Hz or more.
- the optical shutters 2-1 to 2-4 have a one-to-one correspondence with the display terminals 1-1 to 1-4, and are ON (transmits light) during a period in which the corresponding display terminal displays the secret image SR. The other periods are OFF (light is blocked). Therefore, the user U1 wearing the optical shutter 2-1 can visually recognize the secret image SR displayed on the display unit 12-1 of the display terminal 1-1 through the optical shutter 2-1. Similarly, the users U2 to U4 can visually recognize the secret images SR displayed on the display terminals 1-2 to 1-4 through the optical shutters 2-3 to 2-4 worn by the users U2 to U4. it can.
- the secret image SR displayed in the frame on each of the display terminals 1-1 to 1-4 is canceled by the reverse image RV displayed in the frame. Therefore, when the third party views the display units 12-1 to 12-4 of the display terminals 1-1 to 1-4 without passing through the optical shutters 2-1 to 2-4, the third party The secret image SR cannot be seen, and only the public image PB is visually recognized.
- the secret image SR and the public image PB respectively displayed on the display terminals 1-1 to 1-4 may be the same image in part or all of the display terminals 1-1 to 1-4. Moreover, you may differ for every display terminal.
- the display terminal 1-1 includes a communication unit 11-1, a display unit 12-1, and an optical shutter control unit 13-1.
- the communication unit 11-1 communicates with the display control device 3. For example, the communication unit 11-1 receives the image assignment signal ASN from the display control device 3.
- the image assignment signal ASN is a display timing signal indicating the timing (timing information) for displaying the secret image SR, the inverted image RV, and the public image PB in one frame.
- the display unit 12-1 Based on the image allocation signal ASN output from the communication unit 11-1, the display unit 12-1 switches between the secret image SR, the inverted image RV, and the public image PB in one frame as shown in FIG. To display.
- the optical shutter control unit 13-1 transmits a synchronization signal SYC to the optical shutter 2-1 based on the image assignment signal ASN received from the display control device 3.
- the synchronization signal SYC is a signal for performing ON / OFF control of the optical shutter 2-1.
- the optical shutter control unit 13-1 transmits the Hi level synchronization signal SYC to the optical shutter 2-1 while the display unit 12-1 displays the secret image SR. Further, the optical shutter control unit 13-1 transmits a low level synchronization signal SYC to the optical shutter 2-1, while the display unit 12-1 displays an image other than the secret image SR.
- the display terminal 1-1 is configured by an information processing device that stores the communication unit 11-1 and the optical shutter control unit 13-1 in the same casing, and the display unit 12-1 is a display device such as a monitor. It may be configured.
- the display terminal 1-1 may be configured by an information processing apparatus that stores all of the communication unit 11-1, the display unit 12-1, and the optical shutter control unit 13-1 in the same casing.
- the display terminals 1-2 to 1-4 correspond to the communication unit 11-1, the display unit 12-1, and the optical shutter control unit 13-1 included in the display terminal 1-1.
- Communication units 11-2 to 11-4, display units 12-2 to 12-4, and optical shutter control units 13-2 to 13-4 are provided.
- optical shutters 2-1 to 2-4 a specific configuration of the optical shutters 2-1 to 2-4 will be described in detail. Since the optical shutters 2-1 to 2-4 have the same configuration, the configuration of the optical shutter 2-1 will be described below as an example.
- the optical shutter 2-1 includes a communication unit (not shown) and a shutter mechanism (not shown).
- the optical shutter 2-1 receives the synchronization signal SYC from the display terminal 1-1.
- the optical shutter 2-1 is turned on (open), and when the synchronization signal SYC received from the display terminal 1-1 is at the Low level In this case, the optical shutter 2-1 is turned off (closed).
- the display timing of the secret image SR on the display terminal 1-1 and the ON / OFF (open / close) timing of the optical shutter 2-1 are synchronized.
- the optical shutter 2-1 is in the ON state during the period in which the secret image SR is displayed, and the optical shutter 2-1 is in the OFF state in the period in which an image other than the secret image SR is displayed.
- the logic of the synchronization signal SYC and the logic of shutter opening / closing may be reversed. That is, the shutter may be turned off when the synchronization signal SYC is at the Hi level, and the shutter may be turned on when the synchronization signal SYC is at the Low level.
- the synchronization signal SYC may be encrypted. By encrypting, it is possible to prevent the display timing from being intercepted by anyone other than the user of the display terminal.
- the display terminals 1-1 to 1-4 switch and display a plurality of images in one frame at high speed.
- image switching for example, when switching from the public image PB to the secret image SR, when viewed through the optical shutter, only the secret image should originally be visible, but is displayed one subframe before in time.
- image crosstalk occurs in which the public image PB is reflected.
- the optical shutters 2-1 to 2-4 are desirably optical shutters that can be opened and closed at high speed.
- the optical shutters 2-1 to 2-4 may be mechanical shutters that open and close mechanically. Further, the optical shutters 2-1 to 2-4 may be liquid crystal shutters that are opened and closed by sandwiching a liquid crystal between two opposed polarizing plates and controlling a voltage applied to the liquid crystal.
- applicable liquid crystal methods include a TN (Twisted Nematic) method, a VA (Vertical Alignment) method, an IPS (In Plane Switching) method, an OCB (Optically Compensated Bend) method, and the like.
- the optical shutters 2-1 to 2-4 may be liquid crystal shutters using a ferroelectric liquid crystal or an antiferroelectric liquid crystal as a liquid crystal. This liquid crystal shutter is excellent in terms of high-speed operation.
- the communication method used to transmit the synchronization signal SYC from the display terminals 1-1 to 1-4 to the optical shutters 2-1 to 2-4 may be a wired communication method or a wireless communication method.
- the frequency band of the carrier wave is separated so that the synchronization signals SYC transmitted from a plurality of display terminals do not interfere with each other, and the channels of the synchronization signals SYC are changed. It is desirable to set exclusively.
- the display control device 3 may control which channel is assigned to the synchronization signal SYC transmitted from the display terminals 1-1 to 1-4 to the optical shutters 2-1 to 2-4. In this case, the display control device 3 displays the image assignment signal ASN added with information indicating each channel to be assigned to the synchronization signal SYC transmitted to the optical shutters 2-1 to 2-4 as the display terminals 1-1 to 1-4. Send to.
- IDs identification information for individually identifying the corresponding pairs of the display terminals 1-1 to 1-4 and the optical shutters 2-1 to 2-4 are assigned in advance and synchronized.
- the ID may be added to the header of the signal SYC.
- the optical shutters 2-1 to 2-4 determine the destination of the received synchronization signal SYC based on the ID, and turn on / off based on the synchronization signal SYC addressed to itself. Perform the action. As a result, interference of the synchronization signal SYC between the optical shutters 2-1 to 2-4 can be avoided.
- the display terminals 1-1 to 1-4 can transmit the synchronization signal SYC using carrier waves in the same frequency band.
- the display control apparatus 3 includes display timings that identify the display terminals 1-1 to 1-4 and that display timings of the secret images SR displayed on the display terminals 1-1 to 1-4 are mutually exclusive.
- the image allocation signal ASN is transmitted to the display terminals 1-1 to 1-4.
- the display control device 3 may be, for example, a personal computer, a server, or a relay device that functions as a wireless LAN access point. Further, the display control device 3 is not limited to the one configured with a separate housing from the display terminals 1-1 to 1-4 as shown in FIG. For example, any one of the display terminals 1-1 to 1-4 may have a function as the display control device 3.
- the display control device 3 includes a communication unit 31 and a display control unit 32.
- the display control unit 32 generates an image assignment signal ASN to be transmitted to each of the display terminals 1-1 to 1-4.
- the image assignment signals ASN to the display terminals 1-1 to 1-4 are supplied from the display control unit 32 to the communication unit 31.
- the communication unit 31 transmits / receives information to / from each of the display terminals 1-1-1-4. For example, the communication unit 31 transmits the image assignment signals ASN output from the display control unit 32 to the display terminals 1-1 to 1-4. As a method for the communication unit 31 to transmit the image allocation signal ASN to the display terminals 1-1 to 1-4, the following method can be considered.
- the communication unit 31 displays the image allocation signal immediately before displaying the image of the first subframe for each frame or for each predetermined number of frames for each of the display terminals 1-1 to 1-4.
- An ASN may be transmitted.
- the communication unit 31 may transmit the image assignment signal ASN only once to the display terminals 1-1 to 1-4. Good.
- the communication unit 31 transmits the image allocation signal ASN for each frame. Is desirable. Further, the communication unit 31 switches the image switching timing (for example, the switching timing from the secret image SR to the public image PB, the switching timing from the public image PB to the reverse image RV, and the reverse image RV to the secret image SR).
- the image allocation signal ASN may be sequentially transmitted to the corresponding display terminal at every switching timing.
- FIG. 4 shows the configuration of the display control unit 32.
- the display control unit 32 includes a frame time determination unit 321, a subframe number determination unit 322, a subframe time determination unit 323, and a display order determination unit 324.
- the frame time determination unit 321 is a cycle determination unit that determines the time of one frame in each of the display terminals 1-1 to 1-4.
- the frame time determination unit 321 determines the time of a frame including the display of the secret image SR, the public image PB, and the reverse image RV for each of the display terminals 1-1 to 1-4, and determines the time of the frame as a subframe. Output to the unit 323.
- the subframe number determination unit 322 is a subperiod number determination unit that determines how many subframes a frame is divided into.
- the subframe number determination unit 322 detects the number of terminals, which is the number of display terminals 1-1 to 1-4 currently connected to the display control device 3, and determines the number of subframes based on the detected number of terminals. And the number of subframes is output to the subframe time determination unit 323.
- the display terminals 1-1 to 1-4 send an image transmission request for requesting transmission of the image allocation signal ASN to the display control device 3.
- the image transmission request includes information (terminal identification information) that can identify the requesting display terminal.
- the image transmission requests of the display terminals 1-1 to 1-4 are supplied to the subframe number determination unit 322.
- the subframe number determination unit 322 detects the number of display terminals connected to the display control device 3 based on the terminal identification information of the received image transmission request.
- the subframe number determination unit 322 calculates the number of subframes in one frame based on the detected number of terminals. For example, when the number of terminals is four, at least four subframes are required to display the secret image SR exclusively between four display terminals. In addition, at least one subframe for displaying the reverse image RV is always required in one frame. Therefore, in this case, the subframe number determination unit 322 determines that the number of subframes in one frame is five.
- the subframe time determination unit 323 is a sub-cycle determination unit. Based on the time of the frame output from the frame time determination unit 321 and the number of subframes output from the subframe number determination unit 322, the subframe time determination unit 323 determines the subframe time (secret image SR, Corresponding to the display periods of the public image PB and the reverse image RV). Specifically, the subframe time determination unit 323 divides the time of the frame output from the frame time determination unit 321 by the number of subframes output from the subframe number determination unit 322, Determined as frame time. The subframe time thus determined is supplied from the subframe number determination unit 322 to the display order determination unit 324.
- the display order determination unit 324 refers to the time of the subframe supplied from the subframe time determination unit 323 for each of the display terminals 1-1 to 1-4, and determines which image (secret image SR) for each subframe. And the reverse image RV or the public image PB). That is, the display order determining unit 324 determines the display order of the secret image SR, the inverted image RV, and the public image PB within one frame for each of the display terminals 1-1 to 1-4.
- the display order determination unit 324 makes the display order of the images for each frame the same for each of the display terminals 1-1 to 1-4, and also displays the display terminals 1-1 to 1-1.
- the other display terminal displays an image other than the secret image SR.
- images are displayed in the order of the secret image SR, the public image PB, the public image PB, the public image PB, and the cancellation image RV in each frame.
- images are displayed in the order of the public image PB, the secret image SR, the public image PB, the public image PB, and the cancellation image RV in each frame.
- exclusive display control is performed so that the position (order) of the subframe in which the secret image SR is displayed differs between the display terminals 1-1 and 1-2. That is.
- the display order determination unit 324 generates an image assignment signal ASN indicating the determined display order of images for each of the display terminals 1-1 to 1-4, and outputs it to the communication unit 31.
- the synchronization signal SYC transmitted from the display terminals 1-1 to 1-4 to the optical shutters 2-1 to 2-4 is a signal indicating at what timing the secret image SR is displayed, and is an image allocation signal. It contains almost the same information as the information contained in the ASN. Therefore, the display control apparatus 3 transmits the image assignment signal ASN to the display terminals 1-1 to 1-4, and directly transmits the image assignment signal ASN to the optical shutters 2-1 to 2-4 instead of the synchronization signal SYC. May be.
- each of the optical shutters 2-1 to 2-4 is turned on only during a period in which the corresponding display terminals of the display terminals 1-1 to 1-4 display the secret image SR.
- the period during which the corresponding display terminal is displaying an image (reverse image RV or public image PB) other than the secret image SR is set to the OFF state.
- the user U1 wearing the optical shutter 2-1 can visually recognize the secret image SR displayed on the display unit 12-1 through the optical shutter 2-1.
- the display terminals 1-2 to 1-4 display images other than the secret image SR (Public image PB) is displayed. Therefore, when the user U1 wearing the optical shutter 2-1 sees the display terminals 1-2 to 1-4 through the optical shutter 2-1, the information is displayed on the display terminals 1-2 to 1-4.
- the public image PB being viewed is visually recognized. That is, the user U1 wearing the optical shutter 2-1 cannot see the secret image SR displayed on each of the display terminals 1-2 to 1-4.
- the timing of image display of the display terminals 1-1 to 1-4 is synchronized, and in each frame, the period during which the display terminal 1-1 displays the secret image SR (the optical shutter 2-1 is in the ON state)
- the public image PB is always displayed on the display terminals 1-2 to 1-4. Therefore, when the user U1 is viewing the secret image SR displayed on the display terminal 1 through the optical shutter 2-1, it is displayed on any of the display terminals 1-2 to 1-4 in the field of view. Even if the public image PB is entered, no flicker occurs in the display of the public image PB.
- the users U2 to U4 of the display terminals 1-2 to 1-4 can view the secret image SR displayed on the display terminal used by the user,
- the secret image SR displayed on a display terminal other than the display terminal used by can not be visually recognized, and flicker does not occur.
- a plurality of different images are displayed in a time-division manner within one frame, so that persons who do not wear the optical shutters 2-1 to 2-4 can display the display terminals 1-1 to 1-1.
- the order of images assigned to subframes is not limited to the order shown in FIG.
- the reverse image RV is displayed on all the display terminals 1-1 to 1-4 in the fifth subframe of each frame, but the subframe for displaying the reverse image RV is the fifth subframe. It may be other than the subframe.
- the display control device 3 causes the display terminal 1-1 to display images in the order of public image PB, public image PB, secret image SR, public image PB, and reverse image RV.
- images may be displayed on the display terminal 1-3 in the order of the secret image SR, the public image PB, the public image PB, the public image PB, and the reverse image RV.
- the exclusive display control of the secret image SR can be performed between the display terminals 1-2 to 1-4.
- the display order of the images on the display terminals 1-1 to 14 is such that the user visually recognizes the secret image SR and the reverse image RV displayed on the display terminal other than the display terminal used by the user through the optical shutter. Any order that cannot be used. Therefore, for example, it is desirable that the display terminals 1-2 to 1-4 do not display the secret image SR during the period in which the optical shutter 2-1 connected to the display terminal 1-1 is in the ON state.
- the optical shutter 2-1 Since the optical shutter 2-1 is in the ON state during the period when the display terminal 1-1 displays the secret image PB, at least one of the display terminals 1-2 to 1-4 (for example, for example, When the display terminal 1-2) displays the secret image PB, the user U1 of the display terminal 1-1 visually recognizes the secret image SR displayed on the display terminal 1-2 through the optical shutter 2-1. Can be done. Furthermore, the optical shutter 2-2 is also in the ON state during the period when the display terminal 1-2 is displaying the secret image SR. Therefore, the user U2 of the display terminal 1-2 can also visually recognize the secret image SR displayed on the display terminal 1-1 through the optical shutter 2-2. According to the present embodiment, since the display periods of the secret images SR of the display terminals 1-1 to 14 are different, the user wearing the optical shutter can display other than the display terminal used by the user. The secret image SR displayed on the terminal cannot be visually recognized.
- the reverse image RV is an image for canceling the contents of the secret image SR, and is an image having a high correlation with the secret image SR. Therefore, in order to avoid the content of the reverse image RV being known to others, the display period of the reverse image RV between the display terminals 1-1 to 14 is the display of the secret image SR on the other display terminals. It is desirable to make it different from the period. As a result, for example, when the user U1 is viewing the secret image SR displayed on the display terminal 1-1 through the optical shutter 2-1, in the period when the optical shutter 2-1 is in the ON state, It is possible to avoid the display terminals 1-2 to 1-4 displaying the reverse image RV.
- the remaining display terminals are images that have no correlation (or low correlation) with the secret image SR, for example, public images.
- PB a monochrome image with uniform gradation (for example, black level), and the like are displayed.
- the remaining display terminals may not display images during the period when any of the display terminals 1-1 to 14 is displaying the secret image SR.
- the backlight may be turned off as a process for not displaying an image.
- FIG. 6 is a block diagram showing a configuration of a display system according to the second embodiment of the present invention.
- the display control device 3 has a frame synchronization control unit 33, which is different from the display system of the first embodiment.
- the display terminals 1-1 to 1-4 When receiving the image assignment signal ASN from the display control device 3, the display terminals 1-1 to 1-4 promptly switch and display images at the display timing shown in FIG. It is necessary to accurately match the image display timing (or image switching timing) between the display terminals 1-1 to 1-4.
- the display timing of the display terminal 1-1 is shifted from the display timing of the display terminal 1-2. For this reason, when the user U1 views the display unit 12-2 of the display terminal 1-2 through the optical shutter 2-1, the secret image SR and the reverse image RV may be partially reflected.
- the delay time of each communication path used for transmission of the image assignment signal ASN between the display control device 3 and the display terminals 1-1 to 1-4 may be different for each frame.
- the public image PB is seen in a certain frame, but the secret image SR or the reverse image RV is mixed with the public image PB in another frame. The image may be visible. This mixed image is perceived as flicker.
- the communication path used for transmission of the image assignment signal ASN from the display control device 3 to the display terminals 1-1 to 1-4 is irregularly data (image assignment) such as a LAN cable (network cable).
- irregularly data image assignment
- LAN cable network cable
- Including signals other than the signal ASN is not a communication path, but a connection path with as little delay as possible, such as a USB cable or dedicated line, or a connection path that reaches any display terminal with the same delay time It is desirable to use it.
- the display order determining unit 324 performs the two sub-sequences shown in FIG. A period during which all the display terminals 1-1 to 1-4 display the public image PB may be inserted between the frames.
- the timing of receiving the image allocation signal ASN transmitted from the display control device 3 is different for each of the display terminals 1-1 to 1-4, the timing corresponding to the insertion period of the public image PB is inserted. The margin increases and flicker can be suppressed.
- the frame synchronization control unit 33 is a cycle synchronization unit.
- the frame synchronization control unit 33 transmits a frame synchronization signal (a signal different from the image allocation signal ASN) indicating the head of the frame to all the display terminals 1-1 to 1-4.
- the frame synchronization signal is a period synchronization signal.
- the display control unit 32 transmits the image allocation signal ASN to the display terminals 1-1 to 1-4 in advance through the communication unit 31, and notifies the frame synchronization control unit 33 that the image allocation signal ASN has been transmitted.
- the frame synchronization control unit 33 transmits the frame synchronization signal to all the display terminals 1-1 to 1-4 all at once. Send. Broadcast using a wireless communication system is suitable for simultaneous transmission of the frame synchronization signal.
- the display terminals 1-1 to 1-4 When receiving the frame synchronization signal, the display terminals 1-1 to 1-4 immediately start displaying subframes sequentially based on the image allocation signal ASN that has already been received (or after a predetermined time has elapsed).
- the broadcast using the wireless communication method it is possible to substantially match the reception timings of the simultaneously transmitted frame synchronization signals at the display terminals 1-1 to 1-4. Therefore, for example, even when there is a shift in the reception timing of the image assignment signal ASN transmitted prior to the frame synchronization signal between the display terminals 1-1 to 1-4, the display terminals 1-1 to 1 -4 starts display of subframes simultaneously based on the frame synchronization signal, so that the display timings of the images on the display terminals 1-1 to 1-4 can be made to coincide with each other accurately.
- the display control device 3 and the display terminals 1-1 to 1-4 have a clock function (clock unit). It is also possible to synchronize the respective display timings using the time information measured by the display terminals 1-1 to 1-4.
- an information processing apparatus having a clock function such as a general PC may be applied as the display terminals 1-1 to 1-4.
- the times measured by the clock functions of the display terminals 1-1 to 1-4 do not always coincide with each other at the msec level.
- the display control device 3 acquires time information indicating the time measured by the clock functions of the display terminals 1-1 to 1-4 from the display terminals 1-1 to 1-4.
- the display control device 3 calculates a time difference (delay or advance) between the time measured by its own clock function and the time acquired from each of the display terminals 1-1 to 1-4. Then, the display control device 3 obtains, for each of the display terminals 1-1 to 1-4, the frame disclosure time at the time measured by the clock function of the display terminal with reference to the calculated time difference, An image allocation signal ASN including the obtained time and the display timing of each of the secret image SR, the inverted image RV, and the public image PB in the frame is transmitted to the display terminal.
- the display terminals 1-1 to 1-4 in accordance with the time and image allocation included in the image allocation signal ASN transmitted from the display control device 3, in the frame, the secret image SR, the inverted image RV, and the public image PB. Are displayed in time division. As described above, even when the clocks of the clocks of the display terminals 1-1 to 1-4 do not coincide with each other, the display timings of all the display terminals 1-1 to 1-4 can be synchronized, and flickering can be achieved. No exclusive display control is possible.
- a general NTP (Network Time Protocol) server is used as another method for synchronizing the time measured by the clock included in the display control device 3 and the time measured by the clock included in the display terminals 1-1 to 1-4.
- NTP Network Time Protocol
- a method may be used in which the clock possessed by the display control device 3 and the clock possessed by the display terminals 1-1-1-4 are synchronized with the time distributed from (not shown).
- the flickering occurs. Can be suppressed.
- the above-described image allocation signal ASN is a signal including display timing at which each of the display terminals 1-1 to 1-4 displays the secret image SR, the inverted image RV, and the public image PB in the frame. Therefore, for example, when the display terminal 1-1 intercepts the image assignment signal ASN sent to the display terminal 1-2, the user UI of the display terminal 1-1 knows the image display timing of the display terminal 1-2. End up.
- the optical shutter 2-1 is illegally modified so that the display terminal 1-2 is turned on / off in synchronization with the timing of displaying the secret image SR.
- the user U1 can know the contents of the secret image of the display terminal 1-2.
- the display system of the present embodiment is obtained by adding a configuration for encrypting and transmitting the image allocation signal ASN to that of the first embodiment.
- the configuration of the display system of the present embodiment will be specifically described. Since the display terminals 1-1 to 1-4 have the same configuration, the configuration of the display terminals 1-1 to 1-2 will be described below as an example.
- the display terminal 1-1 includes a key generation unit 14-1 and a decryption unit 15-1 in addition to the communication unit 11-1, the display unit 12-1, and the optical shutter control unit 13-1.
- the display terminal 1-2 includes a key generation unit 14-2 and a decryption unit 15-2 in addition to the communication unit 11-2, the display unit 12-2, and the optical shutter control unit 13-2.
- the key generation unit 14-1 generates an encryption key (public key) EK1 and a decryption key (secret key) DK1 unique to the display terminal 1-1.
- the encryption key EK1 is transmitted in advance to the display control device 3 through the communication unit 11-1, and the decryption key DK1 is supplied to the decryption unit 15-1.
- the key generation unit 14-2 generates an encryption key (public key) EK2 and a decryption key (secret key) DK2 unique to the display terminal 1-2.
- the encryption key EK2 is transmitted in advance to the display control device 3 through the communication unit 11-2, and the decryption key DK2 is supplied to the decryption unit 15-2.
- the display control device 3 includes an encryption unit 34 in addition to the communication unit 31 and the display control unit 32.
- the display control unit 32 generates an image assignment signal ASN for the display terminal 1-1 and an image assignment signal ASN for the display terminal 1-2. These image assignment signals ASN are supplied to the encryption unit 34.
- the encryption unit 34 holds the encryption key EK1 generated by the key generation unit 14-1 and the encryption key EK2 generated by the key generation unit 14-2.
- the encryption unit 34 encrypts the image assignment signal ASN for the display terminal 1-1 using the encryption key EK1, and encrypts the image assignment signal ASN for the display terminal 1-2 using the encryption key EK2. .
- the encrypted image assignment signal ASN for the display terminal 1-1 is transmitted to the display terminal 1-1 through the communication unit 31.
- the encrypted image assignment signal ASN for the display terminal 1-2 is transmitted to the display terminal 1-2 through the communication unit 31.
- the communication unit 11-1 receives the encrypted image assignment signal ASN for the display terminal 1-1 transmitted from the display control device 3, and decrypts the received image assignment signal ASN. To the conversion unit 15-1.
- the decryption unit 15-1 decrypts the encrypted image assignment signal ASN for the display terminal 1-1 with the decryption key DK1 generated by the key generation unit 14-1.
- the decoding unit 15-1 supplies the decoded image assignment signal ASN to the optical shutter control unit 13-1 and the display unit 12-1.
- the display unit 12-1 displays the secret image SR, the public image PB, and the reverse image RV in one frame based on the decoded image assignment signal ASN.
- the optical shutter control unit 13-1 generates a synchronization signal SYC for controlling the optical shutter 2-1, based on the decoded image assignment signal ASN.
- the communication unit 11-2 receives the encrypted image assignment signal ASN for the display terminal 1-2 transmitted from the display control device 3, and decrypts the received image assignment signal ASN. To the conversion unit 15-2.
- the decryption unit 15-2 decrypts the encrypted image assignment signal ASN for the display terminal 1-2 with the decryption key DK1 generated by the key generation unit 14-2.
- the decoding unit 15-2 supplies the decoded image assignment signal ASN to the optical shutter control unit 13-2 and the display unit 12-2.
- the display unit 12-2 displays the secret image SR, the public image PB, and the reverse image RV in one frame based on the decoded image assignment signal ASN.
- the optical shutter control unit 13-2 generates a synchronization signal SYC for controlling the optical shutter 2-2 based on the decoded image assignment signal ASN.
- the image allocation signal ASN is encrypted with the encryption key unique to each of the display terminals 1-1 and 1-2, other than the display terminals 1-1 and 1-2. Even when the image allocation signal ASN is intercepted by a third party other than the display terminal or the users U1 to U2, the display timing of the image can be made difficult to know.
- the synchronization signal SYC includes information having substantially the same content as the information included in the image assignment signal ASN. Therefore, when the synchronization signal SYN is intercepted by a user or the like who tries to steal the secret image SR displayed on the other display terminal by illegally using one of the display terminals 1-1 and 1-2, There is a risk that the secret image SR will be seen.
- the optical shutter control unit 13-1 includes a key generation unit similar to the case where the image assignment signal ASN is encrypted and transmitted. It is desirable to generate the synchronization signal SYC for controlling the optical shutter 2-1 using the encryption key generated by 14-1. Similarly, it is desirable that the optical shutter control unit 13-2 generates the synchronization signal SYC for controlling the optical shutter 2-2 using the encryption key generated by the key generation unit 14-2.
- the display terminals 1-3 and 1-4 have the same configuration as the display terminal 1-1.
- the display terminals 1-1 to 1-4 have the secret image SR at the relatively same display timing (subframe order) in each frame. And the reverse image RV and the public image PB are displayed. Therefore, the display terminals 1-1 to 1-4 display the secret image SR, the reverse image RV, and the public image PB at the same timing in each frame.
- the display on the other display terminal is performed based on the image allocation signal ASN transmitted to the display terminal used by the user. There is a risk that the timing can be estimated.
- FIG. 8 shows that the users who correctly use the image allocation signal ASN received by the display terminal (hereinafter referred to as normal terminal users) looked at the display terminals 1-1 to 1-4 in the exclusive display control shown in FIG. And a picture when a person who tries to steal a secret image SR displayed on another display terminal other than the one used by himself / herself looks at the display terminals 1-1 to 1-4. It is.
- the image assignment signal ASN transmitted to the display terminal 1-1 includes information such as displaying the secret image SR in the first subframe and displaying the inverted image RV in the fifth subframe. Contains. Therefore, the user U1 of the display terminal 1-1 determines which of the second to fourth subframes the display terminals 1-2 to 1-4 based on the image assignment signal ASN transmitted to the display terminal 1-1. It can be estimated that the secret image SR is displayed.
- the user U1 determines the subframe (first subframe) in which the display terminal 1-1 displays the secret image SR based on the display timing included in the image assignment signal ASN transmitted to the display terminal 1-1.
- a counterfeit optical shutter IMS an optical shutter set to be in an ON state in a subframe other than the frame
- the display terminal 1-2 It is possible to peep into the secret image SR displayed in ⁇ 1-4.
- the subframes to which the secret image SR is assigned have the same display timing relative to each frame. For this reason, once the frequency of the counterfeit optical shutter IMS is set so that the secret image SR of another display terminal can be seen, the secret image SR displayed by the other display terminal can be viewed in subsequent frames.
- the user who uses any one of the display terminals 1-1 to 1-4 is set based on the display timing indicated by the image allocation signal ASN transmitted to the display terminal used by the user.
- the forged optical shutter IMS it is possible to steal the secret image SR displayed on another display terminal.
- the secret image SR displayed on the other display terminal is displayed using the forged optical shutter IMS.
- the user who peeks at is called an unauthorized terminal user.
- an unauthorized terminal possessor hereinafter referred to as an unauthorized person who does not possess a terminal.
- the unauthorized person who does not own the terminal displays the frequency and phase of the signal for controlling ON / OFF of the forged optical shutter IMS. It can be set to the same value as the frame frequency and phase of the secret image SR displayed on the terminals 1-1 to 1-4. In this case, the secret image SR displayed on the display terminals 1-1 to 1-4 can be seen in a peep.
- exclusive display control is performed so that the secret image SR is not easily seen by the forged optical shutter IMS.
- the exclusive display control method will be described below.
- the display order determination unit 324 of the display control device 3 randomly displays the display timing (subframe number) of the secret image SR on the display terminals 1-1 to 1-4 for each frame. Has been changed. This is different from the exclusive display control shown in FIG.
- the user U1 of the display terminal 1-1 is an unauthorized user, sets the opening / closing timing of the forged optical shutter IMS based on the image assignment signal ASN received by the display terminal 1-1, Consider a case where an image on a display terminal is to be viewed.
- the display order determination unit 324 randomly assigns the display timing (display order) of the secret image SR for each frame. Therefore, the user U1 who illegally uses the display terminal 1-1 used by himself / herself sees the secret image SR in the next frame even though the secret image SR can be seen in a certain frame through the forged optical shutter IMS. It is not always possible. For example, the reverse image RV or the public image PB may be seen in the next frame.
- one frame consists of five subframes, the secret image SR and the reverse image RV are each displayed in one subframe, and the public image PB is displayed in three subframes. Is done. In this case, there is a probability that the unauthorized terminal user can see the secret image SR or the reverse image RV using the forged optical shutter IMS synchronized with the frame frequency at which the display terminals 1-1 to 1-4 display the image. 2/5.
- the probability that an unauthorized user of a terminal can view the secret image SR or the reverse image RV using the forged optical shutter IMS increases as the number of display terminals 1-1 to 1-4 subject to exclusive display control increases. The smaller it becomes.
- the secret image SR is not easily seen by an unauthorized terminal user or the like ( Can reduce the possibility of being seen).
- the secret image SR, the public image PB, and the reverse image RV displayed by the display terminals 1-1 to 1-4 appear randomly in each frame. Therefore, the flicker is large and the image is perceived as an extremely unpleasant image for the viewer.
- An image when the reverse image RV and the public image PB are seen in a sneak pattern is called a synchronized random image.
- the other display terminals 1-2 to 1-4 are in the period in which the optical shutter 2-1 is in the ON state (the period in which the display terminal 1-1 displays the secret image SR).
- the secret image SR when the secret image SR, the public image PB, and the reverse image RV are displayed randomly in each subframe, it is desirable to set the frame frequency to 120 Hz or more.
- the secret image SR since the subframe assignment is random, the secret image SR is assigned to the first subframe in a certain frame, and the secret image SR is the fifth subframe in the next frame. May be assigned.
- the frame frequency is set to 60 Hz
- the frequency of only the secret image SR (the frequency at which the secret image SR is displayed when viewed through the optical shutter) is lowered to about 30 Hz, which is about half. End up.
- the secret image SR flickers when viewed through the optical shutters 2-1 to 2-4, and the image quality is deteriorated.
- the display frequency of the secret image SR can be secured to 60 Hz or higher regardless of how the display order determination unit 324 assigns images, and the optical shutters 2-1 to 2- Flickering when viewed through 4 can be suppressed.
- the order in which images are assigned to subframes is made random for each frame, and the frame length (frame frequency) is changed for each frame. To do.
- the frame frequency at which the display terminals 1-1 to 1-4 display images is constant. Therefore, when an unauthorized person who does not possess the terminal and uses the forged optical shutter IMS without seeing the image assignment signal ASN steals the secret image SR of the display terminals 1-1 to 1-4, the forged optical shutter IMS opens and closes. By adjusting the frequency to be performed, it can be synchronized with the frame frequency. However, in this case, the image that can be viewed by the unauthorized user possessing the terminal by adjusting the counterfeit optical shutter IMS to the maximum is the secret image SR, the reverse image RV, and the public image that are displayed in a random display order within the frame. It is a synchronous random image that is one of the images PB.
- the frame time determination unit 321 of the display control device 3 randomly sets the frame frequency for each frame.
- the frequency at which the forged optical shutter IMS is opened and closed, and the frame frequency of the image displayed on the display terminal cannot be set to sync.
- an image that can be viewed by an unauthorized person without a terminal is an image formed by mixing a secret image SR, a reverse image RV, and a public image PB that are randomly displayed.
- the flicker is more severe than the synchronous random image. It is difficult to visually recognize the contents of the secret image SR from such an image.
- an image that is visible in a state where the timing for opening / closing the counterfeit optical shutter IMS and the start or end timing of the subframe cannot be synchronized is referred to as an asynchronous random image.
- the asynchronous random image has a plurality of display terminals in the absence of the display control device 3, and each display terminal displays the secret image SR, the reverse image RV, and the public image PB at individual display timings and frequencies.
- each display terminal displays the secret image SR, the reverse image RV, and the public image PB at individual display timings and frequencies.
- it is the same as an image with a large flicker perceived when an image displayed by another display terminal is viewed through an optical shutter synchronized with the display of the secret image SR of one display terminal. It can be said that there is.
- the start and end of the subframe are adjusted by adjusting the frequency and phase at which the forged optical shutter IMS is opened and closed. It can be synchronized with the timing. Therefore, when the display image is photographed with the still camera through the forged light shutter IMS at the timing when the forged light shutter IMS is opened, the secret image SR can be photographed with a certain probability. That is, it can be said that the state in which the other person can see the synchronous random image is a state of lower secrecy than the state in which the other person can see the asynchronous random image.
- the subframe time determination unit 323 sets the same time as the subframes of the display terminals 1-1 to 1-4 for each frame.
- the subframe time determination unit 323 randomly sets not only the frame frequency but also the subframe time for each of the display terminals 1-1 to 1-4.
- the unauthorized terminal user (for example, the user U1) uses the display terminal 1-1 used by himself / herself to allocate the image.
- a signal ASN can be received. Therefore, the unauthorized terminal user can know the frame frequency for all the frames by referring to the image allocation signal ASN.
- the frame frequencies of the display terminals 1-1 to 1-4 are the same. Therefore, if the unauthorized terminal user adjusts the frequency or phase for opening / closing the counterfeit optical shutter IMS based on the image allocation signal ASN received by the display terminal 1-1 used by the terminal unauthorized user, the terminal counterfeit user uses the counterfeit optical shutter IMS. It is possible to see a synchronous random image instead of an asynchronous random image. That is, when the exclusive display control shown in FIG. 10 is performed, the secret image SR is less likely to be seen by unauthorized persons possessing the terminal than when the exclusive display control shown in FIG. 9 is performed, thereby improving confidentiality. However, it is impossible to improve the secrecy when the secret image SR is seen by an unauthorized terminal user.
- the display control apparatus 3 performs the exclusive display control shown in FIG. 11, the subframe times of the display terminals 1-1 to 1-4 are not constant. Therefore, even when the terminal unauthorized user refers to the image allocation signal ASN received using the display terminal used by himself / herself, the subframe time (subframe) at other display terminals other than that used by himself / herself is used. It is impossible to know the timing of the start and end of the frame.
- the frequency or phase at which the counterfeit optical shutter IMS opens and closes based on the display timing indicated by the image allocation signal ASN received by the display terminal used by the terminal unauthorized user. Even if the adjustment is performed, an image (for example, a synchronous random image) that is easier to see than the asynchronous random image cannot be viewed.
- the number of times the secret image SR and the reverse image RV are displayed in one frame may be plural.
- the subframe time determination unit 323 displays a plurality of secret images SR so that the total time for displaying the secret image SR in one frame and the total time for displaying the reverse image RV have the same value.
- the time of the subframe and the time of a plurality of subframes for displaying the reverse image RV may be determined.
- the display control unit 32 may change the brightness of the secret image SR and the brightness of the reverse image RV for each subframe.
- the sum of the product of the luminance of the secret image SR in each subframe displaying the secret image SR and the subframe period for all the subframes displaying the secret image SR is the inverted image.
- luminance of the reverse image RV in each sub-frame where RV is displayed, and its sub-frame period is just to set the product of the brightness
- the number of times the secret image SR is displayed in one frame can be set to two times or more.
- the secret image SR is displayed twice or more in one frame, the same secret image SR may be displayed every time.
- one secret image SR may be composed of a plurality of different partial secret images PSR1 to N (N: an integer of 2 or more), and these partial secret images PSR1 to N may be displayed once.
- N an integer of 2 or more
- the entire secret image SR can be viewed.
- the reverse image RV is an image for canceling the secret image SR, and has information having a high spatial correlation with the secret image SR.
- the display period of the reverse image RV is set to be the same between the display terminals 1-1 to 1-4, any one of the display terminals 1-1 to 1-4 can be used.
- the display period of the reverse image RV of the display terminal may be estimated.
- the unauthorized user of the terminal can view the reverse image RV by using the counterfeit optical shutter IMS, and as a result, the content of the secret image SR may be estimated, and the confidentiality of information becomes weak. End up.
- the display system according to the present embodiment performs exclusive display control that can further improve the confidentiality of the secret image SR.
- the exclusive display control will be described.
- the subframe time determination unit 323 of the display control device 32 displays the secret image SR display period for each frame with respect to each of the display terminals 1-1 to 1-4.
- the display period of the reverse image RV is set at random.
- the display order determination unit 324 randomly sets the display order of the secret image SR and the display order of the reverse image RV for each frame for each of the display terminals 1-1 to 1-4.
- the display period of the reverse image RV is set so as not to reduce the convenience for the normal terminal user who uses the optical shutters 2-1 to 2-4 operating in synchronization with the subframe frequency. It is important that the display terminals 1-1 to 1-4 set each other exclusively during the period during which the secret image SR is displayed. For example, the period during which the display terminals 1-2 to 1-4 display the reverse image RV may be set to a period other than the period during which the display terminal 1-1 displays the secret image SR.
- the secret image SR needs to be displayed exclusively between the display terminals 1-1 to 1-4, but the inverted image RV is not necessarily displayed exclusively.
- the reverse image RV is an image for preventing a secret image from being seen by a third person who is not wearing the optical shutter, and the display period of the reverse image RV is all of the optical shutters 2-1 to 2-2. This is because 2-4 is in a light shielding state.
- the method of setting the display period of the reverse image RV exclusively with the display period of the secret image SR on the display terminals 1-1 to 1-4 is not limited to the exclusive display control shown in FIG. This can also be applied to the exclusive display control shown in FIG.
- the display terminals 1-1 to 1-4 display a plurality of images (secret image SR, inverted image RV, and public image PB) in one frame at high speed. It is necessary to switch to and display. Therefore, it is desirable to use a display suitable for high-speed display such as an organic EL or FED (Field Emission Display) as the display units 12-1 to 12-4 included in the display terminals 1-1 to 1-4.
- a display suitable for high-speed display such as an organic EL or FED (Field Emission Display) as the display units 12-1 to 12-4 included in the display terminals 1-1 to 1-4.
- a liquid crystal display As a general display, a liquid crystal display is widely used, but the response speed of the liquid crystal element is very slow compared to the organic EL. Therefore, when high-speed display of an image as described in each embodiment is performed using a liquid crystal element, the image is viewed through an optical shutter at the time of image switching (for example, when switching from a public image PB to a secret image SR). In this case, only the secret image SR should be visible, but a so-called image crosstalk occurs in which an image (for example, a public image PB) displayed in the immediately preceding subframe is reflected.
- image switching for example, when switching from a public image PB to a secret image SR.
- the display system according to the present embodiment includes the high-quality liquid crystal display units 12-1 to 12-4 that avoid the situation as described above and have no crosstalk even in high-speed display. Since the display units 12-1 to 12-4 have the same configuration, the display unit 12-1 will be described below as an example.
- the display unit 12-1 has a plurality of scanning lines 121 and a plurality of signal lines 122 that are arranged to form a lattice and intersect each other.
- the display unit 12-1 further includes a scanning line driver 123 that controls supply of signals to the plurality of scanning lines 121 and a signal line driver 124 that controls supply of signals to the plurality of signal lines 122.
- the display unit 12-1 is disposed so as to form a lattice in the vicinity of each intersection of the plurality of scanning lines 121 and the plurality of signal lines 122, and crosses through the thin film transistor 127 (hereinafter referred to as TFT 127). It further includes a plurality of pixels 125 connected to the scanning lines 121 and signal lines 122 constituting the unit, and a plurality of storage capacitors 126 connected in parallel to these pixels 125. The number of storage capacitors 126 is the same as the number of pixels 125. Of the pixels 125 arranged in a grid pattern, an effective display region 128 is an area formed by the pixels 125 that actually display image data.
- the scanning line driver 123 controls turning on or off of the TFT 127 which is a switching element by inputting a scanning signal to the scanning line 121.
- the signal line driver 124 When the scanning line driver 123 inputs a scanning signal to the specific scanning line 121 and the TFT 127 connected to the specific scanning line 121 is turned on, the signal line driver 124 has a gradation voltage corresponding to the image data. Is applied to the storage capacitor 126 and the pixel 125 connected to the TFT 127.
- the storage capacitor 126 holds the applied gradation voltage for a certain period.
- the gradation voltage held by the storage capacitor 126 is applied to the pixel 125, the transmittance of the liquid crystal of the pixel 125 changes. Then, the light emitted from the backlight 129 is transmitted through the liquid crystal of the pixel 125, whereby the light is modulated and an image is displayed.
- the order in which the scanning line driver 123 selects the lines of the pixels 125 for one row is arbitrary.
- the scanning line driver 123 may select one line at a time from the top to the bottom or from the bottom to the top of the screen, or may perform interlace scanning for each line.
- the signal line driver 124 supplies the image data to the selected line of pixels 125 in the order selected by the scanning line driver 123.
- FIG. 14 shows an example of a timing chart of one frame period in the display unit 12-1 shown in FIG.
- the frame frequency is 60 Hz
- a plurality of images of the secret image SR, the inverted image RV, and the public image PB are included in three subframes included in one frame (1/60 seconds ⁇ 16.7 milliseconds).
- an image displayed in the first subframe of the three subframes is referred to as a first image
- an image displayed in the second subframe is referred to as a second image.
- An image displayed in the subframe is referred to as a third image.
- Each subframe is displayed for a period of 1/3 of one frame, that is, a period of about 5.6 milliseconds.
- the order of scanning and display is the order of the first image, the second image, and the third image. However, depending on the assignment of the image assignment signal ASN, the order may be different.
- the public image PB may be displayed continuously.
- FIG. 15 is another timing chart in the display unit 12-1 shown in FIG.
- the image displayed in the first subframe of the three subframes is referred to as a first image
- the image displayed in the second subframe is referred to as a second image
- the image displayed at is called the third image.
- the lighting control is performed after waiting for the response of the liquid crystal of each pixel 125.
- the unit 129A performs driving to turn on the backlight 129 (so-called backlight blinking driving). Therefore, when the users U1 to U4 view the secret image SR through the optical shutters 2-1 to 2-4, an image with less crosstalk can be seen compared to the scanning method shown in FIG.
- the scanning lines 121 and signal lines 122 shown in FIG. 13 are formed of a conductor made of a compound such as chromium (Cr) or aluminum (Al), for example.
- each of the scanning line 121 and the signal line 122 has a very long signal line with respect to the signal line width. Therefore, when the scanning line 121 and the signal line 122 are viewed from the side connected to the scanning line driver 123 and the signal line driver 124, it appears as a load composed of a resistance component and a capacitance component.
- the pixel 125 itself also forms a load composed of the resistance component of the TFT 127 and the storage capacitor 126 (in the example of FIG. 13, it has the same structure as a low-pass filter using a general RC circuit). It seems to be doing.
- FIG. 16 shows the configuration of the display unit 12-1 that performs backlight blinking drive without increasing the scanning speed described above.
- the display unit 12-1 shown in FIG. 16 has two TFTs 127A and 127B as TFTs constituting one pixel 125.
- the display unit 12-1 shown in FIG. 16 has two storage capacitors 126A and 126B as storage capacitors.
- the write control circuit 123 B not the scanning line driver 123, turns on or off the entire screen for the TFTs 127 B adjacent to the respective pixels 125 through the plurality of write control lines 128. Turn off. Note that the writing control circuit 123B may be incorporated in the scanning line driver 123 or the signal line driver 124.
- the plurality of write control lines 128 are arranged substantially parallel to the plurality of scanning lines 121, and the pixel 125 and the TFT 127 ⁇ / b> A are provided at intersections of the write control lines 128 and the scanning lines 121 and the plurality of signal lines 122. 127B and storage capacitors 126A and 126B are provided.
- FIG. 17 shows an example of a timing chart of one frame in the display unit 12-1 shown in FIG.
- the scanning line driver 123 controls the turning on or off of the TFT 127 ⁇ / b> A connected to the scanning line 121 by inputting a scanning signal to the scanning line 121.
- the signal line driver 124 applies a gradation voltage corresponding to the image data to the storage capacitor 126A.
- the storage capacitor 126A stores the applied gradation voltage.
- the writing control circuit 123B turns on the TFTs 127B of all the pixels 125 at once. Then, the gradation voltage stored in the storage capacitor 126A is written to the pixel 125, and the entire screen is refreshed with new image data.
- the writing control circuit 123B turns off the TFTs 127B of all the pixels at once.
- the scanning line driver 123 and the signal line driver 124 cooperate to scan (write) the next image data.
- the display unit 12-1 displays the image data immediately before the image data being scanned.
- the entire one subframe period (about 5.6 msec) can be used as the scanning period for writing to the pixels. That is, writing to the pixel 125 can be performed in the scanning period of the same time as the timing chart shown in FIG. 14, and it is possible to avoid increasing the scanning speed.
- the lighting control unit 129A turns on the backlight 129 after the TFT 127B is turned on and the image is refreshed and the liquid crystal response is finished. Therefore, compared with the lighting operation shown in FIG. 15, the lighting period of the backlight 129 can be lengthened, and an additional effect that the luminance is improved can be obtained.
- the write control circuit 123B when the write control circuit 123B writes voltages to the pixels all at once, the voltage applied to the pixel 125 is determined by capacitive coupling of the storage capacitor 126A and the storage capacitor 126B. However, when the gradation voltage of the previous image data remains in the storage capacitor 126B, the applied voltage may deviate from the desired gradation voltage depending on the value of the residual voltage. In order to eliminate the influence (history effect) of such a residual voltage, a reset TFT for resetting the voltage applied to the liquid crystal pixel 125 to a predetermined voltage (for example, the ground potential GND level) is applied to each pixel 125. May be provided separately.
- a predetermined voltage for example, the ground potential GND level
- the write control circuit 123B turns on the TFTs 127B all at once (that is, immediately before the gradation voltage stored in the storage capacitor 126A is written to the pixel 125), the reset TFT is turned on once. Further, all the pixels 125 are reset at once. According to this operation, when the gradation voltage is written, the residual voltage associated with the previous image data is not accumulated in the storage capacitor 126B, so that the desired gradation voltage can be reliably written, and consequently The display image quality can be improved.
- the display units 12-1 to 12-4 display the public image PB or display nothing during a period other than the period during which the secret image SR or the reverse image RV is displayed.
- a monochromatic image which is an image having a uniform gradation (for example, black level) may be displayed.
- the backlight 129 may be turned off during a period other than the period during which the secret image SR or the reverse image RV is displayed.
- the backlight 129 can be avoided, and a notebook personal computer or the like driven using power supplied by a battery or the like is used as the display terminals 12-1 to 12-4.
- the secret image SR, the reverse image RV, and the public image PB can be displayed for a long time.
- overdrive is known as another method for compensating the response delay of the liquid crystal.
- Overdrive is based on a comparison between one received image (referred to as the next frame) and an image of the frame immediately before the next frame (referred to as the current frame) displayed on the display unit 12-1. This is a technique for determining the final image value when the next frame is displayed on the display device.
- an image value larger than the image value of the next frame is determined as the final pixel value of the next frame.
- an image value that is smaller than the image value of the next frame is determined as the final pixel value of the next frame.
- the final pixel value of the next frame is determined as 180 gradations, and the determined 180 gradations are displayed on the pixels.
- the original gradation of the next frame 150 gradations in this example
- the next frame achieves a luminance equivalent to 150 gradations due to the liquid crystal response delay. I can't.
- the response of the liquid crystal becomes sharp, and the luminance equivalent to 150 gradations can be obtained.
- the liquid crystal response is changed by adaptively changing the gray level when the next frame is displayed according to the gray level difference between the current frame and the next frame. It is an advantage in overdrive that the desired brightness can be easily obtained by compensating for this delay.
- the display terminal 1-1 When overdrive is performed during exclusive display control, as shown in FIG. 18, in addition to the communication unit 11-1, the display unit 12-1, and the optical shutter control unit 13-1, the display terminal 1-1 It has a frame memory 16-1, an OD (overdrive) computing unit 17-1, and an OD-LUT (lookup table) 18-1. This point is different from the configuration shown in FIG.
- the frame memory 16-1 plays a role of storing image data of the current frame.
- the OD calculation unit 17-1 compares the pixel value of the image of the next frame transmitted from the image transmission source such as a PC with the pixel value of the image of the previous frame stored in the frame memory 16-1. Then, based on the comparison result of the pixel values, the OD calculation unit 17-1 determines the final pixel value (hereinafter referred to as overdrive image data) to be displayed on the display unit 12-1 when the next frame is displayed. decide.
- the OD-LUT 18-1 is stored in a storage medium (not shown) such as a ROM (Read Only Memory) or a RAM (Random Access Memory).
- a storage medium such as a ROM (Read Only Memory) or a RAM (Random Access Memory).
- the OD-LUT 18-1 is information that associates the pixel value of the image data of the image of the next subframe, the pixel value of the image data of the image of the current subframe, and the pixel value of the overdrive image data.
- the pixel value of the overdrive image data corresponds to the output gradation.
- the OD calculating unit 17-1 When the image data of the image of the next subframe to be calculated corresponding to the image to be calculated (for example, the secret image SR) is output from the communication unit 11-1, the OD calculating unit 17-1 The image data (for example, public image PB) of the image of the current subframe displayed on the display unit 12-1 immediately before is read from the frame memory 16-1 as a reference image (for example, public image).
- a reference image for example, public image
- the OD computing unit 17-1 refers to the OD-LUT 18-1, and refers to the pixel value of the image data of the image of the next subframe (for example, the secret image SR) and the pixel of the image data of the image of the current subframe.
- a pixel value of overdrive image data associated with a set of values is specified.
- the OD calculation unit 17-1 outputs overdrive image data including the specified pixel value to the display unit 12-1.
- FIG. 19 shows an example of the data structure of the OD-LUT 18-1 when the image data is composed of 8-bit data.
- the OD-LUT 18-1 includes pixels of overdrive image data associated with a set of next subframe image data to be calculated and current subframe image data serving as a reference image. Values are arranged in a matrix. Note that the OD-LUT 18-1 indicates that when the image data of the calculation target image and the reference image is composed of L-bit data (L is an integer of 1 or more), the gradation of 2L calculation target images, The output gradations associated with the gradations of 2L reference images are included.
- the OD calculation unit 17-1 uses 10 as overdrive image data. Is identified.
- the overdrive image data stored in the OD-LUT 18-1 has any value for the current frame image data for reference with respect to the next frame image data of one specific gradation (for example, 0 gradation). Even if it is (0 to 255 gradations), when the overdrive image data is displayed as the next frame on the display unit 12-1, the pixel value is set so that the luminance is constant.
- the OD-LUT 18-1 it is possible to display with the same luminance no matter what the sub-frame immediately before the next frame is. That is, the response delay of the liquid crystal can be compensated, and high-quality time-division display is possible.
- the OD-LUT 18-1 is not limited to the matrix configured by 256 rows ⁇ 256 columns illustrated in FIG. 19, and may be, for example, a matrix configured by 8 rows ⁇ 8 columns for every 32 gradations.
- the OD calculation unit 17-1 calculates a pixel value of desired overdrive image data by linear interpolation (interpolation calculation). By reducing the number of overdrive image data stored in the OD-LUT 18-1, the free space that can be stored in the storage medium (not shown) for storing the OD-LUT 18-1 can be increased. .
- the display control device 3 controls the display terminals 1-1 to 1-4 to display the secret image SR mutually exclusively.
- the users U1 to U4 wearing the optical shutters 2-1 to 2-4 may use other users.
- the screens of the display terminals cannot be viewed from each other.
- the back surface of the display surface of the display terminal 1-1 and the back surface of the display surface of the display terminal 1-2 are arranged to face each other, and the user U1 has the user U2 in front of the display surface of the display terminal 1-1. Is in front of the display screen of the display terminal 1-2, the user U1 cannot see the display screen of the display terminal 1-2, and conversely, the user U2 cannot see the display screen of the display terminal 1-1.
- the screen may flicker or a secret image can be seen when one user views the other display terminal.
- the display timing of the secret image of the display terminal 1-1 and the display terminal 1-2 is set to the same period, and the timing at which the display terminal 1-1 displays the secret image SR and the display terminal 1-2 are secret.
- the relationship with the timing for displaying the image SR need not be exclusive.
- the display control device 3 when the display control device 3 is configured to select the presence / absence of exclusive display control according to the mutual positional relationship between the display terminals 1-1 to 1-4, the display terminals 1-1 to 1-4 respectively.
- the degree of freedom of assigning the display timing can be improved.
- the display control device 3 has four display terminals. Although connected to 1-1 to 1-4, the number of display terminals subject to exclusive display control is substantially three. Therefore, the number of processes in which the display control device 3 generates and transmits the image assignment signal ASN can be further reduced.
- the purpose of exclusive display control according to the present invention is to prevent images on other display terminals from flickering when the screens of the display terminals 1-1 to 1-4 are viewed through the optical shutters 2-1 to 2-4. That is. For this reason, when the display terminal is used at a distance that is sufficiently distant that the images displayed on the display terminal used by other users cannot be seen from each other, or separated by a physical shield. When display terminals are arranged in different rooms, it is unnecessary to perform exclusive display control in the first place. Therefore, one display control device 3 may be present for each closed space such as a room.
- one display control device 3 does not necessarily exist physically for each closed space such as a room, and one display control device 3 and a plurality of display terminals controlled by the display control device 3 are connected to one system. It is sufficient that there is one device that plays the role of the display control device 3 in the system.
- one display control device 3A is installed in the room RM-A
- one display control device 3B is installed in the room RM-B.
- the display control device 3A performs exclusive display control of the display terminals 1-1A to 1-4A installed in the room RM-A.
- the display control device 3B may perform exclusive display control of the display terminals 1-1B to 1-4B installed in the room RM-B.
- the display control device 3A and the display control device 3B are independent control devices. You may comprise these display control apparatuses 3A and 3B as one display control apparatus. In this case, the display control device includes each component of the display control devices 3A and 3B.
- each display terminal is controlled so as not to be connected simultaneously with the plurality of display control devices (for example, display control devices 3A and 3B).
- the display terminal receives the image allocation signal ASN transmitted from each of the display control devices to which the display terminal is connected. In this case, it becomes difficult for the display terminal to identify which of the received image allocation signals ASN should be used to perform switching display between the secret image SR, the inverted image RV, and the public image PB. End up.
- each processing unit in the display control device records a program for realizing its function on a recording medium readable by the display control device, in addition to those realized by dedicated hardware.
- the program recorded in the recording medium may be realized by causing the display control device to read and execute the program.
- the recording medium readable by the display control device refers to a transfer medium such as a floppy disk (registered trademark), a magneto-optical disk, a DVD, and a CD, as well as an HDD built in the display control device.
- the program recorded on the recording medium is read by, for example, a control unit included in the display control device, and the same processing as described above is performed under the control of the control unit.
- control unit included in the display control device operates as a computer that executes a program read from a recording medium on which the program is recorded. Note that the above-described program can be similarly applied to the display terminals 1-1 to 1-4.
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Abstract
Description
11-1、11-2、11-3、11-4 通信部
12-1、12-2、12-3、12-4 表示部
121 走査線
122 信号線
123 走査線ドライバ
124 信号線ドライバ
125 画素
126 蓄積容量
127 薄膜トランジスタ
129 バックライト
129A 点灯制御部
13-1、13-2、13-3、13-4 光シャッタ制御部
14-1、14-2 鍵生成部
15-1、15-2 復号化部
2-1、2-2、2-3、2-4 光シャッタ
3 表示制御装置
31 通信部
32 表示制御部
321 フレーム時間決定部
322 サブフレーム数決定部
323 サブフレーム時間決定部
324 表示順序決定部
33 フレーム同期制御部
34 暗号化部
図2は、本発明の第1の実施形態であるディスプレイシステムの構成を示すブロック図である。
図6は、本発明の第2の実施形態であるディスプレイシステムの構成を示すブロック図である。
次に、本発明の第3の実施形態であるディスプレイシステムについて説明する。
次に、本発明の第4の実施形態であるディスプレイシステムについて説明する。
次に、本発明の第5の実施形態であるディスプレイシステムについて説明する。
次に、本発明の第6の実施形態であるディスプレイシステムについて説明する。
次に、本発明の第7の実施形態であるディスプレイシステムについて説明する。
次に、本発明の第8の実施形態であるディスプレイシステムについて説明する。
Claims (34)
- 画像を表示する複数の端末と、
前記複数の端末における前記画像の表示を制御する制御装置と、
前記複数の端末のそれぞれに対応して設けられ、対応する端末に前記画像が表示されている期間は入射光を透過する状態とされ、それ以外の期間は入射光を遮光する状態とされる複数の光シャッタと、を有し、
前記制御装置は、前記画像が前記複数の端末に同時に表示されないように前記複数の端末を制御する、ディスプレイシステム。 - 前記制御装置は、前記複数の端末のそれぞれに、前記画像と前記画像とは異なる別の画像とを時分割で表示させ、前記複数の端末の間で、それぞれの端末に表示される画像の切り替わりを同期させる、請求の範囲第1項に記載のディスプレイシステム。
- 前記別の画像は、前記画像を打ち消す打消画像を含み、
前記制御装置は、前記複数の端末のそれぞれについて、当該端末における前記打消画像の表示期間が残りの端末における前記画像の表示期間と重ならないように制御する、請求の範囲第2項に記載のディスプレイシステム。 - 前記打消画像は、前記画像を構成する複数の画素と対応する複数の画素からなり、各画素の輝度値に前記画像の対応する画素の輝度値を加算した場合に、加算後の各画素の輝度値が一定になる、請求の範囲第3項に記載のディスプレイシステム。
- 前記別の画像は、前記画像および打消画像の両画像とは異なる公衆画像を含む、請求の範囲第2項から第4項のいずれかに記載のディスプレイシステム。
- 前記公衆画像は、階調が一様な単色画像である、請求の範囲第5項に記載のディスプレイシステム。
- 前記制御装置は、前記複数の端末のそれぞれについて、フレーム毎に、前記画像、前記打消画像および前記公衆画像を時分割で表示させ、各フレームにおける前記画像、前記打消画像および前記公衆画像の表示順序が同じである、請求の範囲第5項または第6項に記載のディスプレイシステム。
- 前記制御装置は、前記複数の端末のそれぞれについて、フレーム毎に、前記画像、前記打消画像および前記公衆画像を時分割で表示させる表示順序をランダムに決定する、請求の範囲第5項または第6項に記載のディスプレイシステム。
- 前記制御装置は、前記複数の端末のそれぞれについて、前記フレームの周期をランダムに設定する、請求の範囲第7項または第8項に記載のディスプレイシステム。
- 前記制御装置は、前記複数の端末のそれぞれについて、前記フレーム内における、前記画像、前記打消画像および前記公衆画像のそれぞれの表示期間をランダムに設定する、請求の範囲第7項から第9項のいずれかに記載のディスプレイシステム。
- 前記制御装置は、前記公衆画像を所定時間にわたって前記複数の端末に同時に表示させる、請求の範囲第7項から第10項のいずれかに記載のディスプレイシステム。
- 前記制御装置は、前記複数の端末のそれぞれについて、前記フレーム内において、前記画像を複数回表示させる、請求の範囲第7項から第11項のいずれかに記載のディスプレイシステム。
- 前記画像は、互いの画像の輝度を加算した場合に前記画像全体を構成する複数の部分画像からなり、
前記制御装置は、前記複数の端末のそれぞれについて、前記フレーム内において、前記複数の部分画像それぞれを1回ずつ表示させる、請求の範囲第7項から第11項のいずれかに記載のディスプレイシステム。 - 前記制御装置は、前記打消画像が前記複数の端末に同時に表示されないように前記複数の端末を制御する、請求の範囲第2項から第13項のいずれかに記載のディスプレイシステム。
- 前記複数の端末のそれぞれにおける前記画像の表示周波数が60Hz以上である、請求の範囲第1項から第14項のいずれかに記載のディスプレイシステム。
- 前記複数の端末のそれぞれにおける前記画像の表示周波数が120Hz以上である、請求の範囲第1項から第14項のいずれかに記載のディスプレイシステム。
- 前記複数の端末のそれぞれは、
自端末に固有の暗号鍵と該暗号鍵により暗号化されたデータを復号化するための復号鍵とを生成し、該生成した暗号鍵を前記制御装置へ送信する鍵生成部と、
前記制御装置から受信した表示タイミング信号を前記鍵生成部で生成した復号鍵を用いて復号化する復号化部と、
前記復号化部で復号化された表示タイミング信号に基づいて画像を表示する表示部とを有し、
前記制御装置は、前記複数の端末のそれぞれについて、当該端末の前記鍵生成部から送信された前記暗号鍵を受信し、該受信した暗号鍵を用いて、当該端末における画像の表示を制御するための信号を暗号化し、該暗号化した信号を前記表示タイミング信号として当該端末へ送信する、請求の範囲第1項から第16項のいずれかに記載のディスプレイシステム。 - 前記制御装置は、前記複数の端末のそれぞれに、該端末における画像の表示を制御するための表示タイミング信号を送信し、その後、前記表示タイミング信号に基づく画像表示の開始タイミングを示す周期同期信号を前記複数の端末へ一斉に送信し、
前記複数の端末のそれぞれは、自端末への前記表示タイミング信号を受信した後、前記周期同期信号を前記制御装置から受信すると、受信した前記自端末への表示タイミング信号に基づく画像表示を開始する、請求の範囲第1項から第16項のいずれかに記載のディスプレイシステム。 - 前記複数の端末のそれぞれは、時刻を計時する時計部を備え、
前記制御装置は、前記複数の端末の間における前記時計部で計時されている時刻の差を取得し、該取得した時刻の差に基づいて、前記複数の端末のそれぞれで表示される画像の切り替わりを同期させる、請求の範囲第1項から第16項のいずれかに記載のディスプレイシステム。 - 前記複数の端末のそれぞれは液晶表示部を有し、
前記液晶表示部は、
複数の走査線と、
前記複数の走査線と交差する複数の信号線と、
前記複数の走査線への信号の供給を制御する走査線ドライバと、
前記複数の信号線への信号の供給を制御する信号線ドライバと、
前記複数の走査線と前記複数の信号線との各交差部に設けられた複数の画素部と、
前記交差部のそれぞれに設けられ、一方の端子が該交差部に設けられた信号線に接続され、他方の端子が該交差部に設けられた画素部に接続され、制御用端子が該交差部に設けられた走査線に接続された複数のスイッチ素子と、
前記交差部のそれぞれに設けられ、該交差部に設けられたスイッチ素子の他方の端子に、該交差部に設けられた画素部と並列に接続された複数の蓄積容量と、を有し、
前記複数のスイッチ素子はそれぞれ、自スイッチ素子に接続された走査線に前記走査線ドライバから信号が供給されることでオンまたはオフの状態となり、
前記信号線ドライバは、前記複数のスイッチ素子のうち、オン状態とされたスイッチ素子に接続された蓄積容量および画素部にそれぞれ電圧を供給する、請求の範囲第1項から第19項のいずれかに記載のディスプレイシステム。 - 前記液晶パネルは、バックライトと、該バックライトの点灯または消灯を制御する点灯制御部とをさらに有し、
前記液晶パネルに前記画素が表示される表示期間よりも短い画素書込期間において、前記点灯制御部が前記バックライトを消灯するとともに前記信号線ドライバがオン状態とされたスイッチ素子に接続された蓄積容量および画素部にそれぞれ電圧を供給し、
さらに、前記点灯制御部が、前記表示期間から前記画素書込期間を除いた残りの期間の全部または一部の期間にて、前記バックライトを点灯させる、請求の範囲第21項に記載のディスプレイシステム。 - 前記複数の端末のそれぞれは液晶表示部を有し、
前記液晶表示部は、
複数の走査線と、
前記複数の走査線と平行に配置された複数の書込制御線と、
前記複数の走査線および複数の書込制御線と交差する複数の信号線と、
前記複数の走査線への信号の供給を制御する走査線ドライバと、
前記複数の信号線への信号の供給を制御する信号線ドライバと、
前記複数の書込制御線への信号の供給を制御する書込制御回路と、
前記複数の走査線および複数の書込制御線と前記複数の信号線との各交差部に設けられた複数の画素部と、
前記交差部のそれぞれに設けられ、一方の端子が該交差部に設けられた信号線に接続され、制御用端子が該交差部に設けられた走査線に接続された複数の第1のスイッチ素子と、
前記交差部のそれぞれに設けられ、該交差部に設けられた第1のスイッチ素子の他方の端子に接続された複数の第1の蓄積容量と、
前記交差部のそれぞれに設けられ、一方の端子が該交差部に設けられた第1のスイッチ素子の他方の端子に接続され、他方の端子が該交差部に設けられた画素部に接続され、制御用端子が該交差部に設けられた書込制御線に接続された複数の第2のスイッチ素子と、
前記交差部のそれぞれに設けられ、該交差部に設けられた第2のスイッチ素子の他方の端子に接続された複数の第2の蓄積容量と、を有し、
前記複数の第1のスイッチ素子はそれぞれ、自スイッチ素子に接続された走査線に前記走査線ドライバから信号が供給されることでオンまたはオフの状態となり、
前記信号線ドライバは、前記複数の第1のスイッチ素子のうち、オン状態とされたスイッチ素子に接続された第1の蓄積容量に電圧を供給し、
前記書込制御回路は、前記信号線ドライバによる前記第1の蓄積容量への電圧の後、前記複数の書込制御線を通じて前記複数の第2のスイッチを同時にオン状態にする、請求の範囲第1項から第19項のいずれかに記載のディスプレイシステム。 - 前記複数の端末のそれぞれは、
入力された画像データがフレーム単に一時的に格納されるフレームメモリと、
画像データが入力されると、該入力画像データと、前記フレームメモリに格納されている、該入力画像データの1フレーム前の画像データとを比較し、該比較結果に応じて、該入力画像データに基づく画像の階調を変更するオーバードライブ演算部と、有する、請求の範囲第1項から第22項のいずれかに記載のディスプレイシステム。 - 入力された表示タイミング信号に従って画像を表示する複数の端末のそれぞれと通信を行う通信部と、
前記複数の端末における前記画像の表示を制御する表示制御部と、を有し、
前記表示制御部は、前記複数の端末のそれぞれについて、前記画像が前記複数の端末に同時に表示されないように前記画像の表示タイミングを決定し、該決定した表示タイミングを含む信号を、前記表示タイミング信号として、前記複数の端末のそれぞれに前記通信部を通じて送信する、制御装置。 - 前記表示制御部は、前記複数の端末のそれぞれに、前記画像と前記画像とは異なる別の画像とを時分割で表示させ、前記複数の端末の間で、それぞれの端末に表示される画像の切り替わりを同期させるための信号を、前記表示タイミング信号として生成する、請求の範囲第24項に記載の制御装置。
- 前記別の画像は、前記画像を打ち消す打消画像を含み、
前記表示制御部は、前記複数の端末のそれぞれについて、当該端末における前記打消画像の表示期間が残りの端末における前記画像の表示期間と重ならないように制御するための信号を、前記表示タイミング信号として生成する、請求の範囲第25項に記載の制御装置。 - 前記別の画像は、前記画像および打消画像の両画像とは異なる公衆画像を含み、
前記表示制御部は、前記複数の端末のそれぞれについて、フレーム毎に、前記画像、前記打消画像および前記公衆画像を時分割で表示させる表示順序を決定する、請求の範囲第26項に記載の制御装置。 - 前記表示制御部は、
前記フレームの周期を決定する周期決定部と、
前記複数の端末の数に基づいて、前記周期決定部で周期が決定された前記フレーム内における、前記画像、前記打消画像および前記公衆画像を時分割で表示させるためのサブフレームの数を決定する副周期数決定部と、
前記周期決定部で決定された前記フレームの周期と前記副周期数決定部で決定された前記サブフレームの数とに基づいて、前記画像、前記打消画像および前記公衆画像のそれぞれに対応する前記サブフレームの周期をそれぞれ決定する副周期決定部と、
前記複数の端末のそれぞれについて、前記周期決定部で周期が決定された前記フレーム内における、前記画像、前記打消画像および前記公衆画像の表示順序を表示順序決定部と、を有し、
前記表示順序決定部は、前記複数の端末の間で、前記画像を表示するためのサブフレームの期間が互いに重ならないようにし、かつ、前記複数の端末の間で、前記画像を表示するためのサブフレームの期間が前記打消画像を表示するためのサブフレームの期間と重ならないようにする、請求の範囲第27項に記載の制御装置。 - 前記表示順序決定部は、前記フレームごとに、前記表示順序をランダムに設定する、請求の範囲第28項に記載の制御装置。
- 前記周期決定部は、前記フレームの周期をランダムに設定する、請求の範囲第26項または第29項に記載の制御装置。
- 前記副周期決定部は、前記フレーム内における、前記画像、前記打消画像および前記公衆画像のそれぞれの表示期間をランダムに設定する、請求の範囲第28項から第30項のいずれかに記載の制御装置。
- 前記表示順序決定部は、前記複数の端末の間で、前記打消画像を表示するためのサブフレームの期間が互いに重ならないようにする、請求の範囲第28項から第31項のいずれかに記載の制御装置。
- 画像を表示する複数の端末と、前記複数の端末と通信を行う制御装置と、前記複数の端末のそれぞれに対応して設けられ、対応する端末と通信を行う複数の光シャッタと、を有するディスプレイシステムにおける表示方法であって、
前記制御装置は、前記複数の端末のそれぞれについて、前記画像が前記複数の端末に同時に表示されないように前記画像の表示タイミングを決定し、該決定した表示タイミングを含む表示タイミング信号を、前記複数の端末のそれぞれに送信し、
前記複数の端末のそれぞれが、前記制御装置から受信した前記表示タイミング信号に従って前記画像を表示するとともに、該画像の表示期間を示す同期信号を、対応する光シャッタに送信し、
前記複数の光シャッタのそれぞれが、対応する端末から受信した前記同期信号に従って、入射光を透過する状態と入射光を遮光する状態との切り替えを行う、表示方法。 - 入力された表示タイミング信号に従って画像を表示する複数の端末のそれぞれと通信可能な制御装置のプログラムであって、
前記複数の端末のそれぞれについて、前記画像が前記複数の端末に同時に表示されないように前記画像の表示タイミングを決定する処理と、
決定した前記表示タイミングを含む信号を、前記表示タイミング信号として、前記複数の端末のそれぞれに送信する処理とを、前記制御装置のコンピュータに実行させるプログラム。
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US20110243325A1 (en) | 2011-10-06 |
JPWO2010071193A1 (ja) | 2012-05-31 |
US8571217B2 (en) | 2013-10-29 |
JP5447391B2 (ja) | 2014-03-19 |
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