WO2010132994A1 - Traitement de données amélioré pour systèmes d'affichage modulaires - Google Patents

Traitement de données amélioré pour systèmes d'affichage modulaires Download PDF

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Publication number
WO2010132994A1
WO2010132994A1 PCT/CA2010/000768 CA2010000768W WO2010132994A1 WO 2010132994 A1 WO2010132994 A1 WO 2010132994A1 CA 2010000768 W CA2010000768 W CA 2010000768W WO 2010132994 A1 WO2010132994 A1 WO 2010132994A1
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WO
WIPO (PCT)
Prior art keywords
display
image data
codec
display module
data
Prior art date
Application number
PCT/CA2010/000768
Other languages
English (en)
Inventor
Graham Murdoch
Leonid Mordoukhovski
Cheng Qian
Original Assignee
Graham Murdoch
Leonid Mordoukhovski
Cheng Qian
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 Graham Murdoch, Leonid Mordoukhovski, Cheng Qian filed Critical Graham Murdoch
Priority to CA2762363A priority Critical patent/CA2762363A1/fr
Publication of WO2010132994A1 publication Critical patent/WO2010132994A1/fr

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G3/2096—Details of the interface to the display terminal specific for a flat panel
    • 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
    • G09G2340/02—Handling of images in compressed format, e.g. JPEG, MPEG

Definitions

  • the invention relates to video display systems, and more particularly relates to modular and large scale video display systems.
  • LEDs light emitting diodes
  • signs and billboards displaying static or video images are now often designed with LED systems.
  • Large scale display systems suffer from numerous drawbacks when made in a single piece, including a loss of manufacturability, serviceability, and design flexibility when custom sizes are required.
  • HDTV high-definition television
  • a modular display system in order for a modular display system to rapidly receive and display graphics such as standard or high-definition video, it is typically necessary to transmit large amounts of data to each of the display modules in a short period of time.
  • the bit rate is typically very high, often reaching into the hundreds of Mbps.
  • required data rates can be particularly large and often exceed the available bandwidth of typical data transmission systems.
  • High bandwidth data distribution networks, often involving numerous data distribution nodes, are therefore necessary to deliver raw data to display modules.
  • a display module for use in a modular display system, comprising: a display subsystem comprising an array of display elements; a control system comprising an interface for receiving compressed image data, a processor and a codec for decompressing the compressed image data, and a display driver for driving the display elements to display the decompressed image data; and an external connection means for providing electrical power to the display module.
  • the display module preferably further comprises a unique address for identifying a relative spatial location of the display module in a modular display system.
  • the codec may reside in software or hardware, and may be a wavelet-based codec.
  • the interface for receiving compressed image data may comprise one of a wireless receiver and a wireless transceiver, or may be selected from the group consisting of a power-line receiver, a power-line modem, and power-line transceiver.
  • the display module preferably comprises a weatherproofed housing.
  • a modular display system for displaying image data comprising: a plurality of display modules, wherein each display module comprises: a display subsystem comprising an array of display elements; a control system comprising an interface for receiving compressed image data, a processor and a codec for decompressing the compressed image data, and a display driver for driving the display elements to display the decompressed image data; and an external connection means for providing electrical power to the display module; means for mounting the display modules in a desired spatial arrangement; and a primary controller comprising an interface for transmitting the compressed image data to the plurality of display modules.
  • the plurality of display modules may be arranged to display one of a single composite image and a single composite video.
  • the codec may resides in software or hardware, and may be a wavelet-based codec.
  • a control system of a given display module preferably comprises a unique address for identifying a relative spatial location of the given display module in the modular display system.
  • the interface for receiving compressed image data may comprise one of a wireless receiver and a wireless transceiver, and the interface for transmitting the compressed image data may comprise one of a wireless receiver and a wireless transceiver.
  • the interface for receiving compressed image data may be selected from the group consisting of a power-line receiver, power-line modem and power-line transceiver and the interface for transmitting the compressed image data may be selected from the group consisting of a power-line transmitter, power-line modem and power-line transceiver.
  • the primary controller may further comprise a processor and a codec for compressing image data prior to transmitting the image data to the display modules.
  • the primary controller may transmit the compressed data in a multicast format to the display modules.
  • the primary controller may comprises a processor programmed to spatially segment the image data, correlate the spatially segmented image data with the unique addresses of the display modules, compress the spatially segmented image data, and transmit the spatially segmented and compressed image data to the display modules according to the unique addresses.
  • the primary controller may comprise a wireless router providing wireless access to one or more users.
  • a method for displaying image data on a display module within a modular display system comprising: a display subsystem comprising an array of display elements; a control system comprising an interface for receiving compressed image data, a processor and a codec for decompressing the compressed image data, and a display driver for driving the display elements to display the decompressed image data; and an external connection means for providing electrical power to the display module; the method comprising the steps of: receiving compressed image data transmitted by a primary controller; processing the compressed image data with the processor and codec to obtain decompressed image data; and providing the decompressed image data to the display driver for driving the display subsystem to display the decompressed image data.
  • the compressed image data is preferably transmitted and received wirelessly, and the display module preferably further comprises a unique address for identifying a relative spatial location of the display module in the modular display system.
  • the compressed image data may be broadcasted to a plurality of display modules by the primary controller, and the processor may further processes the decompressed image data to obtain a spatial subset of the decompressed image data for display on the display subsystem according to the unique address.
  • the processor preferably deletes decompressed image data relating to other addresses prior to providing the decompressed image data to the display driver.
  • the compressed image data may pertain to a spatial subset of the image data, wherein the spatial subset corresponds to a spatial location and size of the display module, and wherein the primary controller transmits the compressed image data to the display module according to the unique address.
  • the primary controller preferably further comprises spatial calibration data associating the unique address with a spatial location of the display module, and a processor and a codec for spatially segmenting the image data based on the spatial calibration data and compressing the spatially segmented image data.
  • the primary controller may further comprise a processor for modifying a property of the image prior to compressing and transmitting the image data, wherein the property is selected from the group consisting of resolution, image quality, bit rate, and YCbCr component sampling.
  • Figure 1 shows a schematic of a control subsystem in which the codec resides in software.
  • Figure 4 shows a transmission scheme in which an image or video file is segmented into individual files and transmitted to specific display modules.
  • the array of display elements forming the display subsystem is controlled by the control subsystem.
  • the control subsystem comprises all of the electronics needed to receive the image or video data, buffer incoming data, decompress or decode the data with a codec, process the decoded data, and furthermore comprises display element drivers to drive appropriate display elements to display the required image.
  • the codec may be software executed by a processor, or a separate hardware decoder communicating with the processor (e.g. an FPGA may be programmed to act as a codec).
  • the data decompression can be done simultaneous to playback, or can be done prior to playback. In the later case, data sent to a module would be decompressed by the codec and stored in its raw form for playback later.
  • each module represents only a fraction of the display area in a modular system
  • any data irrelevant to a given module would preferably be deleted immediately after or during decompression and only relevant data would be stored.
  • the control subsystem and the display system are contained within a housing that includes an external connection for providing power to the display module.
  • the external connection may further provide image or video data to the display module.
  • the housing is preferably weatherproofed using gaskets and/or other sealing materials known in the art, such as silicone.
  • the housing may include a transparent window for protecting the display subsystem.
  • the housing may further comprise an array of lenses and/or louvers to further protect the pixel elements and/or improve the quality of the displayed image. Additional configurations for mounting the subsystems making up the display modules are disclosed in
  • connection provides the dual function of providing power to each display module and also physically connecting each display module to the supporting frame.
  • connection also mechanically connects the conductive grid to the frame.
  • the processors may include a microcontroller, a central processing unit, an embedded processor, a digital signal controller, an embedded digital signal processor, a field programmable gate array or integrated circuit capable of performing the necessary data decompression and/or data handling operations.
  • the interface may comprise any communications interface for receiving image data, including, but not limited to, a serial or parallel port, wireless receiver or transceiver, power line receiver or transceiver, USB port, FireWire port, Ethernet port, ATA/IDE interface, SCSI interface and PCI interface.
  • a real time clock oscillator may be provided on each module to maintain mutual synchronization of the operations performed on each module.
  • To set initial time or counter values, or to periodically reset the current time or counter on each module to the desired value ssynchronization signals may be provided by the primary controller or one or more modules. Periodic resynchronization is needed to correct for clock drift.
  • Uncompressed image or video data is sent to a display controller or display element driver 22, which provides the appropriate current or voltage to drive individual pixel elements 24.
  • the codec may reside in the separate physical processor 26, as shown in Figure 2.
  • Each module control system preferably includes an identifier such as an address that enables the display module to be uniquely addressed by the primary controller. This enables the primary controller to provide information to each display module regarding the subset of the main image or video that that a given display module is to display, or alternatively delivers a specific subset of the full image or video data to a given display module, where the subset relates to the portion of the data or image that the display module is to display.
  • This one-to-many transmission format is supported by a number of transmission standards, including ZigBee, WiFi, Ultra Wide Band, MiWi, Bluetooth, 3G, 4G, or other protocols based on the 802.11 , or 802.15 standards.
  • the primary controller sends a file or data stream simultaneously to a number of nodes, where the nodes are display modules.
  • the aim of multicasting is to reduce congestion on a network by speaking to all the required nodes at once.
  • the drawback of this type of communication is that it can be prone to errors because the nodes do not communicate a receipt of packet acknowledgement in order to conserve bandwidth.
  • this type of acknowledgement is generally done with typical IP unicasting.
  • an image or video file is spatially subdivided by a processor residing in the primary controller prior to transmission, as shown in Figure 4
  • the primary controller could then transmit module-specific individual files, shown schematically as 40, or data streams using the known address of each module.
  • sending the entire file at once to all of the modules in its compressed form is likely preferable because media files, once compressed using conventional methods, are difficult to separate into spatial components and retain a large compression ratio.
  • image and video files that are compressed using traditional compression algorithms such as JPEG or MPEG are only useful once they are decoded; in their compressed state, the images are locked in a state in which nothing can be extracted or scaled. Due to the processing power and inexpensive nature of processors, redundant decompression of the entire image by the module control system and selection of the spatially relevant portion is a preferred option.
  • This problem may be circumvented according to the following embodiment, which enables the delivery of rapid, high-quality decoding of HD encoded video.
  • This embodiment incorporates a wavelet-based algorithm that generates compressed data that retains the ability to easily extract different representations of the image for various end applications without the need to recompress the data.
  • the present embodiment provides a wavelet-based compression codec in which image or video data can be spatially subdivided into address-specific files containing only the necessary spatial data for a particular display module while retaining full compression.
  • Precincts are then segmented into equal-sized code blocks, which are then entropy coded using an algorithm that provides a stream of compressed data that progressively improves the accuracy of the decoded data.
  • Each code block may be accessed independently and can be grouped according to its significance to the particular application.
  • the control subsystem within each display module includes a wavelet-based compression codec (such as JPEG2000) capable of spatial segmentation.
  • the primary controller includes a corresponding codec for encoding image or video data, while in another embodiment the image or video data is provided to the primary controller in a pre-encoded format.
  • the image or video may be provided to the primary controller in a first compressed format, where it is decompressed and re-compressed into a wavelet-based codec capable of spatial segmentation.
  • the modular display system further serves as a wireless access point for internet connectivity.
  • the primary controller of the system may include a WiFi wireless router.
  • access to the wireless network requires authorization.
  • the authorization includes information that can only be ascertained by reading the information displayed on the modular display system.
  • the authorization may be a password that is a brand name displayed in an advertisement on the modular display.
  • the authorization step requires that users of the wireless access point read information on the display.
  • a user would only be granted access for a fixed period of time. When the time period is exceeded, the user would be required to view the display again and follow an authorization step. Additionally, the bandwidth per user may be limited, and the total data downloaded or uploaded over a selected time period may be constrained.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

L'invention concerne un système d'affichage modulaire qui comprend la compression vidéo en vue d'une transmission efficace de données vidéo ou d'images. Chaque module à l'intérieur d'un système d'affichage modulaire comprend un codec, matériel ou logiciel, afin de décompresser une image ou une vidéo avant d'afficher l'image ou la vidéo. En incluant un codec pour la décompression des données d'images ou des données vidéo, le système permet une transmission efficace de fichiers d'images ou de données de haute qualité avec un système de transmission à faible débit binaire. Selon un mode de réalisation préféré, on utilise un codec à base d'ondelettes pour permettre la sous-division spatiale d'un fichier d'images ou d'un fichier vidéo comprimé avant la transmission aux modules d'affichage formant l'affichage modulaire.
PCT/CA2010/000768 2009-05-21 2010-05-20 Traitement de données amélioré pour systèmes d'affichage modulaires WO2010132994A1 (fr)

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CA2762363A CA2762363A1 (fr) 2009-05-21 2010-05-20 Traitement de donnees ameliore pour systemes d'affichage modulaires

Applications Claiming Priority (2)

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US21326409P 2009-05-21 2009-05-21
US61/213,264 2009-05-21

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120194564A1 (en) * 2011-01-31 2012-08-02 White Christopher J Display with secure decompression of image signals
US20130251025A1 (en) * 2012-03-26 2013-09-26 American Megatrends, Inc. Memory bandwidth reduction during video capture
CN103348399A (zh) * 2011-01-31 2013-10-09 全球Oled科技有限责任公司 具有图像信号的安全解密的显示器
CN106981265A (zh) * 2017-05-25 2017-07-25 京东方科技集团股份有限公司 处理器、显示驱动器和电子设备
US11212900B2 (en) * 2017-03-22 2021-12-28 10644137 Canada Inc. LED apparatus having one or more communication units and a method of employing same

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WO1999041732A2 (fr) * 1998-02-17 1999-08-19 Sarnoff Corporation Structure d'affichage electronique par paves
EP1227468A2 (fr) * 2001-01-30 2002-07-31 Eastman Kodak Company Méthode de integration de système de commande et de dispositifs d'affichage sur un substrat commun
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Cited By (13)

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Publication number Priority date Publication date Assignee Title
CN103339667B (zh) * 2011-01-31 2016-03-09 全球Oled科技有限责任公司 对图像信号进行安全解压缩的显示器
WO2012105999A1 (fr) * 2011-01-31 2012-08-09 Global Oled Technology Llc Dispositif d'affichage à décompression sécurisée de signaux d'image
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CN103348399A (zh) * 2011-01-31 2013-10-09 全球Oled科技有限责任公司 具有图像信号的安全解密的显示器
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KR101763247B1 (ko) * 2011-01-31 2017-07-31 글로벌 오엘이디 테크놀러지 엘엘씨 이미지 신호의 보안 압축해제를 갖는 디스플레이
KR101763248B1 (ko) * 2011-01-31 2017-07-31 글로벌 오엘이디 테크놀러지 엘엘씨 이미지 신호를 보안적으로 복호화하는 디스플레이
US20130251025A1 (en) * 2012-03-26 2013-09-26 American Megatrends, Inc. Memory bandwidth reduction during video capture
US11212900B2 (en) * 2017-03-22 2021-12-28 10644137 Canada Inc. LED apparatus having one or more communication units and a method of employing same
CN106981265A (zh) * 2017-05-25 2017-07-25 京东方科技集团股份有限公司 处理器、显示驱动器和电子设备
US10939082B2 (en) 2017-05-25 2021-03-02 Boe Technology Group Co., Ltd. Processor, display driver, and electronic device

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