WO2000079791A1 - Fonction d'arret sur image dans un systeme de projection electronique - Google Patents

Fonction d'arret sur image dans un systeme de projection electronique Download PDF

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Publication number
WO2000079791A1
WO2000079791A1 PCT/US1999/023476 US9923476W WO0079791A1 WO 2000079791 A1 WO2000079791 A1 WO 2000079791A1 US 9923476 W US9923476 W US 9923476W WO 0079791 A1 WO0079791 A1 WO 0079791A1
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WO
WIPO (PCT)
Prior art keywords
computer
image
electronic
projection system
presentation
Prior art date
Application number
PCT/US1999/023476
Other languages
English (en)
Other versions
WO2000079791A9 (fr
Inventor
David Dashefsky
Timothy L. Mccullough
Original Assignee
3M Innovative Properties Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Company filed Critical 3M Innovative Properties Company
Priority to AU65118/99A priority Critical patent/AU6511899A/en
Publication of WO2000079791A1 publication Critical patent/WO2000079791A1/fr
Publication of WO2000079791A9 publication Critical patent/WO2000079791A9/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/4448—Receiver circuitry for the reception of television signals according to analogue transmission standards for frame-grabbing

Definitions

  • the present invention relates generally to the electronic presentation of viewable images to an audience. More specifically, the present invention relates to an electronic presentation system and a method for implementing a freeze-frame feature in an electronic projection device.
  • Overhead projector / film-based presentation has been in existence since early 1960s.
  • the presentation style established at that time is still with us today. Specifically, a presentation outline is prepared, then visual aids, such as 8 1/2 by 11 -inch slide transparencies, are prepared to help the presenter communicate the message to the audience.
  • the transparencies typically are organized in sequence. A careful presenter may prepare private notes and "back up transparencies" that the presenter could use to answer various questions as they arose. This "talk and show" presentation style was simple and quite user-friendly and naturally formed the basis for new presentation technologies.
  • LCD multimedia projectors have started to be used for presentations.
  • the transparency slides which once were actual pieces of film, were replaced by images on a computer.
  • the video port of the presenter's computer is connected to an LCD projector, such as via a 15 pin D-Sub cable. Connected in this manner the LCD projector receives and simultaneously attempts to display whatever image is showing on the computer's native screen, at the same resolution.
  • This "computer based presentation” has grown in popularity as projection quality has increased and proj ector cost has decreased.
  • presentation software usually has two basic modes; authoring mode and presenting/presentation mode.
  • the authoring mode is the most powerful mode since it is where the presenter prepares the images that help to reinforce the presenter's speech/viewpoint.
  • the author creates the slides that include supportive visual aids. These visual aids may include text, charts, images and other visual objects that emphasize or explain a particular point.
  • visual aids also referred to as objects or bullet points, are coded to appear onto a slide in a certain sequence predetermined by the author. This allows the presenter to use the slide to make his/her point premise by premise. Likewise the sequence of slides is important; and common authoring software allows the author to arrange the slide sequence prior to the presentation.
  • the author may code certain slides to be 'hidden' (i.e., not shown) during presentation mode. To add drama and artistic flair the slides may be coded to transition smoothly from one to another, such as using a fade, rather than just jump to the next slide.
  • the slides are displayed in the predetermined authored sequence using the predetermined transition. Further the bullets/objects within each slide likewise are displayed in their predetermined sequence.
  • the presenter does not have the ability to modify, or "re-author", the presentation transparently without leaving the presentation mode.
  • the presenter by way of a keystroke or mouse click, may control the transition from slide to slide and bullet/object to bullet/object.
  • the appearance of a new object onto a slide, or the transition of one slide to another will both be referred to as an "image transition", since the image that is being viewed by the audience has transitioned to another image.
  • the presentation described above appears on the computer screen of the presenter.
  • the same image usually is sent, raster line by raster line, to a multimedia projectors via the 15 pin D-Sub connector. Due to the large variety of computers and changing video standards, the image data may come at various rates.
  • the multimedia projector must then synchronize the frame rate of this input signal with the frame rate of the LCD imaging devices.
  • One method to accomplish the synchronization is the use of a video frame buffer.
  • a video frame buffer As the image data is received from the computer, an electronic version of the image is written into the video buffer at the rate dictated by the computer. This image data is then read out of the buffer at a rate optimal for the LCD imaging devices.
  • a complete image replica of the computer screen exist in the projector's video buffer for a very short period of time. This image is updated very rapidly, usually about every 1/60* of a second. Current video frame buffers still do not resolve resolution discrepancy image degradation.
  • One method includes creating a custom presentation computer having two video boards and two corresponding video ports, one for the presenter's screen and one for the multimedia projector. This method is relatively expensive and requires a custom-modified computer. Another method is to incorporate a video driver in a PCMCIA card. This method also is relatively expensive, requires custom modifications and hinders ease of use.
  • Still another method is to use a "smart" projector having independent memory and image processing capabilities.
  • a database of duplicate, resolution independent images then may be stored in the smart projector.
  • the presenter while not able to manipulate the images, may remotely signal the projector to present the appropriate slide while maintaining independent notes in the presenter's own computer.
  • This method albeit useful, requires in fact two image management systems, one for the presenter and one incorporated inside the projector. The method does not work well for ceiling mounted projectors or other projectors that are difficult to access and increases the cost of the projector.
  • the solution would give the presenter the freedom to have a private view including the audience's view, a view of the next slide in sequence, and speaker notes, while allowing the presenter to manipulate the slides privately. It also would be desirable to have a system that would correct automatically for any mismatch between the computer and the projector.
  • the present invention relates to a method and an apparatus for facilitating electronic projection presentations with an electronic presentation system.
  • the presentation system includes a computer and an electronic projection system.
  • the computer may include a central processing unit having a video output.
  • the computer may further include a user video display unit coupled to receive and display images transmitted by the video output.
  • the electronic projection system includes illumination and projection optics, one or more imagers and an image buffer.
  • the electronic projection system is coupled to the computer to receive and display the image frames transmitted by the video output.
  • the electronic projection system further may be coupled to the computer to receive a control commands.
  • the electronic projection system includes hardware and/or software, wherein upon receipt of a first control command the image buffer retains a last image frame transmitted 5 by the video output prior to the reception of the first command and the electronic projector continues to display the last image frame.
  • the method of the present invention comprises the steps of transmitting a first image frame from the computer and storing the image frame into the video frame buffer of the electronic projector.
  • the electronic projector projects the first image frame onto an 0 audience screen.
  • the user or the computer then may issue the first command to the electronic projector.
  • the projection system Upon receipt of the first command, the projection system maintains the first image frame in the video frame buffer and ignores any other image frames transmitted by the computer.
  • the projection system continues to project the first image frame stored in the video frame buffer. Meanwhile, the video display unit continues to 5 display images transmitted by the computer after the transmission of the first command.
  • the method further may include the step of transmitting a second command.
  • the electronic projection system Upon receipt of the second command, the electronic projection system resumes accepting other image frames transmitted by the computer. These new image frames are stored in the video frame buffer and are displayed by the projection system.
  • the commands may be o issued by the user using a control panel or remote control, or may be programmed to be issued by the computer.
  • the computer is programmed to automatically switch from a presentation or display mode to an authoring or presenter mode upon issuance of the first command. Similarly, the computer may be programmed to switch to display 5 mode in conjunction with the issuance of the second command. In a preferred embodiment, the computer is programmed to automatically switch to display mode prior to allowing the image buffer to accept new image frames, thus maintaining a transparent image transition to the audience. The computer may be further programmed to then transmit a new image frame or slide, again issue the first command, and automatically o return to authoring mode.
  • the electronic projection system may have a first image resolution and the video display unit may have a second image resolution.
  • the computer also may be programmed to switch to the resolution of the projector during display mode and to the resolution of the video display unit during the authoring mode.
  • the present invention encompasses a computer program product for controlling the electronic projection system coupled to the computer.
  • the computer program product includes a computer usable medium having computer readable program code for causing a computer to transmit digital images; and computer readable program code for causing a computer to transmit a first control signal instructing the electronic projector to continue to display a received digital image and to ignore further transmitted digital images.
  • the computer program product further may include computer readable code for causing the computer to transmit a second control signal instructing the electronic projector to receive and display transmitted digital images.
  • the computer program product also may include computer readable code for causing the computer to launch a presenter interface upon transmission of the first control signal and for causing the computer to launch the second control signal upon launch of a presentation interface.
  • a plurality of said digital images are presentation slides.
  • the product may further comprise computer readable code for causing the computer to transmit the first control signal upon transmission of each of the presentation slides.
  • FIG. 1 is a schematic diagram of an electronic presentation system in accordance with the present invention.
  • FIG. 2 is a block diagram representing the flow of presentation images in accordance with the present invention.
  • Figure 3 is a flowchart of an exemplary embodiment of a method in accordance with the present invention.
  • Figure 4 is a schematic diagram of the electronic projection system of Fig. 1 during an exemplary use of a method in accordance with the present invention.
  • the electronic presentation system 100 includes a personal computer 10 and an electronic projector 30.
  • the personal computer 10 includes a central processing unit (CPU) 12 and a video display terminal 14.
  • the CPU 12 may include a microprocessor, memory, and a video graphics card.
  • the computer 10 also may include an alphanumeric input device (e.g., keyboard) 16, a mouse 18, a resident data storage device 20, such as a hard disk, and a removable data storage read/write device 22, such as a floppy disk driver.
  • An additional input device, such as an infrared remote controller or a stylus also may be included in the personal computer 10.
  • the computer 10 also includes appropriate software, such as an operating system, stored within the computer memory and/or data storage devices.
  • the computer 10 may be implemented using a laptop computer, such as a Thinkpad 560 laptop computer from IBM Corporation of Armonk, N.Y., running Windows 98 DOS and Microsoft Power Point presentation software, from Microsoft Corp. from Redmond, Washington.
  • the present invention may be implemented using other types of computers or data processing systems, including, for example, a remote terminal or an internal processor integrated with the electronic projector.
  • a remote terminal or an internal processor integrated with the electronic projector.
  • the use of intelligent workstations, mini-computers or other similar devices also is contemplated to be within the scope of the present invention.
  • FIG. 2 illustrates in block diagram form the electronic connections of the electronic projection system 100.
  • the electronic projector 30 includes an internal video buffer 32 electronically coupled to one or more imagers 34.
  • the internal video buffer in the present exemplary embodiment is a random access memory device, such as DRAM, SGRAM, or
  • the projector 30 has a frame buffer 32 having a memory size at least equal to twenty-four (24) times the number of pixels in the native resolution (for a 24-bit color system) of a single image frame.
  • the frame buffer is controlled by a frame buffer control unit.
  • a VGA signal is interfaced from the video port of the computer 10 to the projector 30 through a High-Density 15 (HD 15) pin male connector. Analog signals for Red, Green, and Blue are available at this connector.
  • each analog color signal is sent to the input of an 8-bit analog to digital converter. On the output end of the analog to digital converter is a digital representation of the analog signal at a given moment of time (the pixel clock).
  • the pixel clock period is determined by horizontal and vertical synch signals, that are also available on the HD- 1 5 connector, by matching the timing of the horizontal and vertical sync signals with a value in a table stored on the CPU in the system. This table is determined by existing video standards such as VESA.
  • the output of the analog to digital converter is written into the frame buffer in a specific location based on the number of horizontal and vertical synch signals which have been received up to this point by a frame buffer control unit. At this time, the next pixel is available at the output of the Analog to digital converter.
  • the embodiment of the projector 30 also will have a CPU with the ability to receive and decode commands sent on a data link to the outside world, such as an RS232 cable. Incoming commands then may be executed.
  • the CPU of the projector 30 has a freeze and an unfreeze command in the command set, which the CPU can decode. Control commands generally are represented by strings of bytes received serially specifying a function and any parameters that are necessary.
  • the CPU of the projector Upon receipt and decoding of a freeze control command, the CPU of the projector will send signals to the frame buffer control unit to accept no new pixels and simply refresh the existing data in the image buffer.
  • the CPU Upon receipt and decoding of an unfreeze command, the CPU will send signals to the frame buffer controller unit to begin accepting new pixels for the analog to digital converter.
  • Exemplary imagers include transmissive and reflective liquid crystal displays
  • Illumination and projection optics are arranged to project the picture displayed by the imager(s) 34 onto a screen 36 (Fig. 4).
  • the term screen is meant to include any suitable projection surface, such as a specialized controlled reflection screen or a blank wall.
  • the electronic projector 30 includes an input signal port 40 electronically coupled to the video buffer 32.
  • the computer 10 includes a video output signal port 42 having a data connector, such as a 15 pin D-Sub connector.
  • the computer video output port 42 is coupled to the input signal port 42 of the projector via a video/data connector cable 44, such as a VGA video cable.
  • a control cable 46 such as an RS-232 serial control cable, may electronically couple a control port 48, such as a serial port, of the computer 10 to a control port 50, such as a serial port, of the projector 30.
  • the control port 48 of the computer 10 is coupled to the CPU 12, while the control port 50 of the projector 10 is coupled to the data buffer 32.
  • the VGA video cable 44 carries a video image from the computer's video output port 42 to the projector's video input port 40.
  • the RS-232 serial control cable 46 carries digital commands from the computer's serial port 48, to the projector's serial port 50.
  • An exemplary electronic projector 30 may be implemented using a commercially available projector, such as the 3M Model No. MP8625, from Minnesota Mining and Manufacturing in St. Paul, MN.
  • the projector 30 of the present invention has two modes, a simultaneous display mode and a freeze mode.
  • the simultaneous display mode the video buffer 32 is updated approximately every 1/60* of a second with a new frame transmitted from the computer 10 through video output port 42. While, naturally, there may exist some minimal delay in transmitting and projecting the image, to the user's eyes the display of the image on the resident video display unit 14 and on the screen 36 are basically simultaneous.
  • the image displayed by the projector 30 is the same as that displayed by the native video screen 14 of the computer 10.
  • the computer 10 has the capability to send a digital (or analog) "Freeze" command over the RS-232 serial control cable 46, through some other serial or parallel data link such as USB or RS-422, or even through the video data cable 44, such as through the Display Data Channel.
  • a remote control such as control 38, either linked by a cable to the projector 30 or by an infrared or RF transmitter/receiver. Issuance of the Freeze command by the computer 10 may be activated by a user-inputted command, such as a keystroke or mouse click, a preprogrammed toggle input, or may be programmed to be automatically issued, for example, to follow the transmission of a selected slide(s).
  • the projector 30 When the Freeze command is received by the projector 30, the projector 30 "locks" in the most recent image in the video buffer 32 preventing any updates.
  • the video buffer 32 ignores any new images transmitted by the computer 10 and continues to transmit to the imager 34 the same raster data for the last image stored in the video buffer 32.
  • the projector 30 includes a basic CPU.
  • the step of "freezing" the image buffer 32 is accomplished by instructing the projector's CPU, via software commands, to not place any more data into the frame buffer.
  • the image buffer may be configured to have a "do not accept" mode, which may be switched upon receipt of the appropriate electronic command.
  • the described step may be accomplished readily in a variety of ways by those skilled in the art.
  • the computer and/or the presenter may issue an "Unfreeze" command.
  • the projector 30 Upon receipt of the "Unfreeze" command, the projector 30 returns to simultaneous display mode.
  • the Unfreeze command when received by the projector 30, will unlock the video buffer 32, allowing the buffer 32 to be updated with new images.
  • the freeze mode may be implemented using a computer program that controls the functions of the image buffer 32.
  • the program controls the frame/image buffer 32 through commands sent over the control cable or data link to the projector 30.
  • the same function may be implemented by the use of a hardware relay or switching mechanism.
  • Figure 3 illustrates the logic steps involved in practicing a method for facilitating presentations in accordance with the present invention using the electronic presentation system 100. The method may be implemented through the use of hardware installed into the projector, such as the frame buffer and the logic implementation for the freeze function (the buffer control unit and CPU) and/or software installed into the computer.
  • the presenter prepares a presentation, which may include presentation slides, reserve slides, presenter notes and reference materials.
  • the presentation may be authored using standard commercially available authoring software such as PowerPoint from Microsoft.
  • the presenter stores the presentation on the computer 10 (for example, in the computer's memory or data storage devices).
  • the slides may comprise functional screen images and the step of preparing such images may comprise accessing such images.
  • the presenter When the presentation commences, the presenter displays a first slide on the resident video display terminal 14.
  • the presenter may start the presentation using the projector 30 in the simultaneous-display mode or may toggle to such mode.
  • the image is transmitted to the video buffer 32, which receives the image in step 110.
  • the image is stored in the video buffer 32 (step 120) and displayed by the projector 30 (step 130).
  • the same image appears in the presenter's video screen 14 and simultaneously is projected for the audience.
  • the image buffer 32 will continue to receive and store new images transmitted by the computer 10.
  • the presenter may discuss the present slide or update the projected image with a new slide or bullet point.
  • Step 140 illustrates the decision routing that occurs when the projector switches modes. Rather than continuing to receive new images, the projector 30 ignores any new image input and continues to display the last stored image. The switch to Freeze mode is transparent to the audience, who continues to see the current slide. With the projector 30 in Freeze mode, the presenter is then free to switch privately to a separate view, such as an authoring or presenter's mode.
  • Figure 4 illustrates the operation of the method and the system of the present invention. The projector 30 is in freeze mode, automatically continuing to project the last active slide onto the screen 36. The raster information for this slide is stored in the buffer 32. Meanwhile, the presenter's private screen 14 may be used to display notes, other slides or other information. The presenter may have full authoring capability and may delete, add or reorder the slides or even change the content of the slides themselves.
  • Figure 4 shows a larger representation of an exemplary presenter's view in presenter's mode.
  • the presenter's view includes a smaller version of the audience view (sometimes referred to as a 'thumbnail' view), speaker notes, a thumbnail version of the next slide, speaker notes accompanying the next slide, and a means to control the flow of the presentation (such as on-screen buttons having the following functions: return to the beginning, advance one slide, go back one slide, go to the end and pause).
  • the authoring software has been modified also to include a means, such as an on-screen menu or button, to jump to the presentation mode of the presentation software.
  • a further advantage of the software of the present invention is that, if the projector is a different resolution from the computer, the software will configure the video driver on the computer using the facilities of the operating system to match the resolution of the projector.
  • the method of the present invention offers a user transparent mechanism for obtaining a proper image just prior to issuing the freeze command.
  • the computer is switched to match to resolution of the projector by the software and then frozen.
  • the video driver of the computer is then reconfigured back to match the resolution of the resident computer screen prior to displaying the authoring view.
  • the ability to switch back between the resolution of the projector and the resolution of the computer screen allows optimal use of both the projector and the computer without image degradation and without the use of scaling hardware or software.
  • the presenter enjoys the freedom and full functionality of the authoring view, as exemplary described above in reference to Figure 4, until it is time for the next transition.
  • the user returns to a presentation view and the Unfreeze command is issued.
  • the authoring mode and the presentation mode may be implemented using two different software programs. Issuance of the Unfreeze command may be programmed to return control automatically to the presentation software or mode for the duration of the transition.
  • the Freeze command may be issued and control automatically returned to the authoring software or mode.
  • This present freeze- authoring mode-present-unfreeze flow process may continue for each selected slide/bullet until the presentation is terminated.
  • the method of the present invention may be equally applicable to facilitating presentation of "real-time" information. For example, a presenter may navigate and load images from the Internet or a computer program, while, at the same time describing a previously accessed image. This ability would allow for seamless presentations without apparent navigation or downloading delays.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

L'invention concerne un procédé et un système de présentation électronique permettant de faciliter les présentations de projections électroniques. Le système de présentation comprend un système de projection possédant un tampon de trames vidéo et un ordinateur couplé électroniquement au système de projection électronique. Le procédé comprend les étapes suivantes : la transmission d'une première image de l'ordinateur au tampon de trames vidéo du système de projection électronique et le stockage d'une première image dans le tampon de trames vidéo. La première image est ensuite projetée au moyen d'un système de projection électronique. Une première commande peut être établie par le système de projection électronique pour conserver la première image dans le tampon de trames vidéo et pour ignorer toute autre image transmise par l'ordinateur, tout en continuant, dans le même temps, à projeter la première image au moyen du système de projection électronique.
PCT/US1999/023476 1999-06-17 1999-10-07 Fonction d'arret sur image dans un systeme de projection electronique WO2000079791A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU65118/99A AU6511899A (en) 1999-06-17 1999-10-07 Freeze-frame function in an electronic projection system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US33515199A 1999-06-17 1999-06-17
US09/335,151 1999-06-17

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Publication Number Publication Date
WO2000079791A1 true WO2000079791A1 (fr) 2000-12-28
WO2000079791A9 WO2000079791A9 (fr) 2002-08-29

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
EP1406438A2 (fr) * 2002-10-02 2004-04-07 Hewlett-Packard Development Company, L.P. Affichage par projection avec possibilité d'arrêt sur image
EP1452943A2 (fr) * 2003-02-25 2004-09-01 Olympus Corporation Dispositif d'affichage d'images, programme de contrôle des données d'images et procédé de contrôle des données d'images
US8769006B2 (en) 2006-11-28 2014-07-01 International Business Machines Corporation Role-based display of document renditions for web conferencing
US8860891B2 (en) 2003-08-08 2014-10-14 Allen Video Technology, Inc. Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors
US11082466B2 (en) 2013-12-20 2021-08-03 Avaya Inc. Active talker activated conference pointers
CN113542707A (zh) * 2021-07-15 2021-10-22 深圳市火乐科技发展有限公司 投影显示方法、装置、光机和投影仪

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Publication number Priority date Publication date Assignee Title
US20150178260A1 (en) * 2013-12-20 2015-06-25 Avaya, Inc. Multi-layered presentation and mechanisms for collaborating with the same

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WO1995008132A1 (fr) * 1993-09-17 1995-03-23 Proxima Corporation Systeme d'eclairage par projection compact et son procede d'utilisation
EP0740468A1 (fr) * 1995-04-27 1996-10-30 Texas Instruments Incorporated Améliorations apportées à une télévision à balayage progressif
US5790084A (en) * 1988-08-17 1998-08-04 In Focus Systems, Inc. Electronic transparency method and apparatus

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US5790084A (en) * 1988-08-17 1998-08-04 In Focus Systems, Inc. Electronic transparency method and apparatus
WO1995008132A1 (fr) * 1993-09-17 1995-03-23 Proxima Corporation Systeme d'eclairage par projection compact et son procede d'utilisation
EP0740468A1 (fr) * 1995-04-27 1996-10-30 Texas Instruments Incorporated Améliorations apportées à une télévision à balayage progressif

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1406438A2 (fr) * 2002-10-02 2004-04-07 Hewlett-Packard Development Company, L.P. Affichage par projection avec possibilité d'arrêt sur image
EP1406438A3 (fr) * 2002-10-02 2006-03-15 Hewlett-Packard Development Company, L.P. Affichage par projection avec possibilité d'arrêt sur image
US7266778B2 (en) 2002-10-02 2007-09-04 Hewlett-Packard Development Company, L.P. Freezable projection display
EP1452943A2 (fr) * 2003-02-25 2004-09-01 Olympus Corporation Dispositif d'affichage d'images, programme de contrôle des données d'images et procédé de contrôle des données d'images
EP1452943A3 (fr) * 2003-02-25 2008-05-07 Olympus Corporation Dispositif d'affichage d'images, programme de contrôle des données d'images et procédé de contrôle des données d'images
US8860891B2 (en) 2003-08-08 2014-10-14 Allen Video Technology, Inc. Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors
US9300900B2 (en) 2003-08-08 2016-03-29 Allen Video Technology Inc. Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors
US8769006B2 (en) 2006-11-28 2014-07-01 International Business Machines Corporation Role-based display of document renditions for web conferencing
US9032028B2 (en) 2006-11-28 2015-05-12 International Business Machines Corporation Role-based display of document renditions for web conferencing
US11082466B2 (en) 2013-12-20 2021-08-03 Avaya Inc. Active talker activated conference pointers
CN113542707A (zh) * 2021-07-15 2021-10-22 深圳市火乐科技发展有限公司 投影显示方法、装置、光机和投影仪

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AU6511899A (en) 2001-01-09

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