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WO1999054862A1 - Ecran video numerique - Google Patents

Ecran video numerique Download PDF

Info

Publication number
WO1999054862A1
WO1999054862A1 PCT/GB1999/001156 GB9901156W WO9954862A1 WO 1999054862 A1 WO1999054862 A1 WO 1999054862A1 GB 9901156 W GB9901156 W GB 9901156W WO 9954862 A1 WO9954862 A1 WO 9954862A1
Authority
WO
WIPO (PCT)
Prior art keywords
leds
light emitting
emitting diodes
carrier
carrier board
Prior art date
Application number
PCT/GB1999/001156
Other languages
English (en)
Inventor
Ross Livingstone Baker
Original Assignee
Gearhouse Special Projects Ltd.
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 Gearhouse Special Projects Ltd. filed Critical Gearhouse Special Projects Ltd.
Priority to AU35295/99A priority Critical patent/AU3529599A/en
Publication of WO1999054862A1 publication Critical patent/WO1999054862A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/30—Picture reproducers using solid-state colour display devices
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes

Definitions

  • the present invention relates to large screen display devices, particularly screens which can be used for displaying a television or video image on a large area, such as for a large outdoor audience.
  • LEDs light emitting diodes
  • the screen is made up of a plurality of individual LED clusters. In each LED cluster there may be enough LEDs to form one or more individual pixels. Each pixel is made up of a pixel array of red, blue and green LEDs. There is usually an excess of green LEDs in order to obtain the correct colour balance.
  • Each LED cluster is formed by attaching the pixel array (s) of LEDs to a flat carrier board, typically a printed circuit board (PCB).
  • PCB printed circuit board
  • the carrier board is mounted at one end of a box-like housing, with the LEDs protruding from respective holes in a front face of the housing.
  • Clusters themselves may be arranged in arrays to produce a full screen. Their box like construction enables clusters to 2 be arranged side by side and one above the other to form the overall array.
  • a large area video display system comprising an array of light emitting diodes wherein the light emitting diodes are arranged in linear groups, each linear group corresponding to one of a plurality of removable elongate carrier boards for the light emitting diodes .
  • the linear groups may be arranged parallel to a screen image scanning direction so that each linear group can receive portions of a serial image signal.
  • each carrier board comprises (1) a face section configured as an elongate strip which carries on a front surface thereof the linear group of light emitting diodes and (2) a tail section transversely oriented with respect to the face section and attached to a back surface of the face section.
  • the face and tail sections may together form a generally T-shaped or L-shaped cross-section in the carrier board.
  • the tail section may carry decoding control electronics for controlling the activation of the light emitting diodes on the face section in response to an input signal.
  • each carrier board is highly compact and capable of easy removal from the system by the technician grasping the tail section which will typically extend horizontally into a chassis or cabinet in which the carrier board is mounted.
  • Each linear group preferably comprises two lines of LEDs, one line consisting of alternating green and blue LEDs and the other consisting of alternating red and green LEDs.
  • the two lines should form together individual squares of LEDs, the four corners of each respective square occupied by: a green LED; a blue LED; a red LED; and a further green LED.
  • the two green LEDs should be 4 arranged diagonally opposite for best colour rendition.
  • Each group of four LEDs may form an individual image pixel.
  • each line of LEDs in the group consists of 32 LEDs, thereby forming 16 individual pixels of four LEDs each.
  • the carrier boards are each configured after manufacture by balancing of the individual colour and brightness level of each pixel.
  • the balancing values for the pixels on each carrier board are stored in the carrier board electronics. In this way each carrier board is identically balanced and therefore interchangeable with any other carrier board forming part of the screen system.
  • the linear arrangement of the LEDs allows serial activation of the linear groups according with the direction of travel of a digital image raster scan.
  • Each linear group comprises a plurality of individual pixels.
  • control circuitry can be further simplified by providing further tiers of grouping.
  • a plurality of second tier control nodes each node adapted provide signals for multiple carrier boards. Each node therefore corresponds to an area of the screen.
  • a plurality of third tier control nodes each node adapted to provide signals for multiple second tier nodes. Further tiers of nodes may be provided, as required.
  • each second tier node comprises a data distribution board (DDB).
  • DDB data distribution board
  • Six data distribution boards may be provided in a screen module.
  • the module will therefore comprise 192 carrier boards.
  • the carrier boards are arranged as four columns of 48 carrier boards.
  • Each carrier board carries a linear group of sixteen pixels.
  • each module has a nominal resolution of 48 x 64.
  • Each module itself forms 6 a third tier node which is fed by the output of a digital video processor.
  • the video processor may convert an analogue video signal into a digital optical signal.
  • DCM dynamic colour matrixing
  • the carrier boards are preferably accommodated in a mounting cabinet. Each carrier board is adapted to be removable from cabinet by the provision of a removable power connection for each board and a removable image signal connection.
  • the drive electronics for the carrier 7 boards may be mounted spaced apart from the carrier boards, preferably on one or more doors of each cabinet. Ribbon cables may be provided to feed each carrier board or group of carrier boards. Preferably each ribbon cable is connected in series with a plurality of carrier boards, each carrier board accepting an appropriate portion of the data stream carried along the cable and then re-clocking the data for acceptance by the next carrier board.
  • By mounting second (and optionally further tier) electronics spaced apart from the carrier boards sight of and access to the carrier boards is much easier. By locating the second tier electronics mounted on the panel door, when the door is opened the carrier boards are revealed and presented for access.
  • a plurality of cabinets may be provided, each cabinet corresponding to a modular element of a complete screen. Each cabinet may be fed by a separate output from the video processor.
  • FIG. 1 is a perspective view from the front of an LED carrier board according to one aspect of the present invention .
  • Figure 2 is a perspective view from behind of a cabinet forming a screen module containing carrier boards.
  • Figure 3 is sectional view from one side of the carrier boards of figure 1 disposed inside the cabinet shown in figure 2.
  • a carrier board is shown as 10.
  • the carrier board comprises a tail section 11 and a face section 12.
  • the tail section is an elongate rectilinear printed circuit board.
  • a front edge 13 of the tail section is provided with four spaced apart tabs 14. The tabs are entered into corresponding spaced apart slots along the centre line of the face section 12.
  • the tails section and face section together form a T cross-section.
  • the face carries on an outside surface 15 thereof two rows of thirty-two LEDs, each row side by side the other.
  • the first row 16 consists of alternate green 17 and blue 18 LEDs.
  • the second row 19 consist of alternate red and green LEDs.
  • the two rows together form sixteen side by side pixel clusters 20, each cluster comprising a square 9 arrangement of two green LEDs on one diagonal and a red and a blue LED on the other diagonal.
  • the LEDs are soldered in place on the face section.
  • a black closed- cell foam layer 21 is disposed on the outside surface of the face section. The LEDs nestle in the layer with their bulb sections 22 protruding. The LEDs are spaced to give a pixel pitch of 20 mm.
  • the tab and slot connection between the tail and face sections is held fast by soldering between respective LED circuit runs between the face and tail section PCBs .
  • the tail section carries decoding circuitry for decoding serial data fed into the carrier board for in order to control the activation of the LEDs on the board.
  • serial data is fed onto the board via standard male/female releasable connectors 25.
  • a power supply connection is also provided via a releasable connector 26. These connectors may be released for removal of the carrier board from the screen array in case of faults or failure of the carrier board components.
  • FIG. 2 shows a rectilinear aluminium cabinet 100.
  • the cabinet has left and right hand doors 101,102 respectively.
  • the left hand door is shown closed.
  • the 10 right hand door 102 is shown open to reveal the interior of the cabinet.
  • Juxtaposed a front wall of the cabinet 105 are two columns 106,107 of carrier boards 10.
  • the carrier boards are horizontally oriented and arranged parallel and equally spaced one from another.
  • the cabinet contains an array of 192 carrier boards, arranged as four side-by side columns of 48 carrier boards. This forms a screen module having a nominal pixel resolution of 64 x 48.
  • Each door is hinged at an outside edge 108 thereof.
  • Each door is provided with a latch and handle 109 at an inside edge 110 region thereof.
  • An inside surface of each door carries the drive electronics 111 and power supplies 112 for the carrier boards.
  • the doors carry six data distribution boards (DDBs), four LED power supplies and two DDB power supplies.
  • DDBs data distribution boards
  • the cabinets form screen modules having overall dimensions of 1280 mm x 960 mm (64 x 48 pixels) in the 4:3 television ratio. Other ratios can be provided by rearranging the layout of the carrier boards. By mounting these on the doors the carrier boards are revealed and accessible when the doors are opened.
  • FIG 3 the disposition of the carrier boards in a 11 cabinet is exemplified.
  • Two carrier boards are shown near a top edge of the cabinet.
  • the cabinet front wall 105 is machined with a plurality of parallel horizontal grooves 121, each groove corresponding to a line of LEDs.
  • the grooves are provided with spaced apart drilled holes 122 into which the LEDs are entered so that they are visible through the front face of the chassis.
  • the cabinet front wall is formed with orthogonal elongate ribs 123.
  • the ribs serve as light / sun shades which enhance the visibility of the screen in daylight conditions.
  • the complete video screen system comprises two main components, the video processor and the screen itself.
  • the video processor is a personal computer equipped with a special drop-in video controller expansion card. This card accepts as an input a standard analogue video signal of PAL or NTSC television standard.
  • the controller converts this into digital form for distribution by fibre optic means to the screen.
  • Control software controls the distribution of the video signal, according to the particular arrangement of screen modules present.
  • the video processor has four optical outputs, each of which transmit high speed optical data.
  • the first of the 12 four optical outputs feeds a first DDB in the right-most horizontal top row of the video screen. All the display screen modules are identical and are have no particular address values.
  • the data arriving at each screen module is pre-packaged with sufficient information for the row which it feeds.
  • the first DDB inside the first module strips off the picture information relevant to that particular DDB ' s image portion, re-clocks the remaining data and passes it to the next module on the left.
  • the data is therefore sent as a serial data stream.
  • Each DDB feeds a number of carrier boards. Each carrier board receives 16 lines of serial data, one line for each of the pixels on the carrier board. This serial data is decoded by the carrier board to feed each LED of each pixel. This data is held in shift registers which are updated with new information twice per frame.
  • the DDBs also perform a dynamic colour matrixing function. This is possible because, although the nominal resolution of each screen module is 64 x 48, the perceived resolution can be higher. Because the pixels each comprise 4 LEDs arranged as the corners of a square, and each LED is equally vertically and horizontally spaced from its neighbouring pixels, any four adjacent LEDs laid out in the form of a square can form an 13 individual pixel. Hence two neighbouring LEDs from an upper line of LEDs from one carrier board can form a pixel with two neighbouring LEDs from a lower line of an adjacent carrier board above. In this way the effective or perceived resolution may be doubled, with a dramatic improvement in the rendition of text, diagonal lines and curved lines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

La présente invention concerne des dispositifs d'affichage sur écran géant, en particulier des écrans qu'on peut utiliser pour présenter des images de télévision ou des images vidéo sur une grande surface, notamment pour un public extérieur nombreux. Dans un aspect de l'invention, on décrit un système d'affichage vidéo sur grand écran, qui comprend un réseau de diodes électroluminescentes disposées en groupes linéaires, chaque groupe linéaire correspondant à une unité d'une pluralité de cartes à courant porteur allongées amovibles associées aux diodes électroluminescentes. Ces groupes linéaires peuvent être disposés parallèlement au sens de balayage d'un contenu d'écran, de sorte que chaque groupe linéaire puisse recevoir des parties d'un signal d'image en série.
PCT/GB1999/001156 1998-04-16 1999-04-15 Ecran video numerique WO1999054862A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35295/99A AU3529599A (en) 1998-04-16 1999-04-15 Digital video screen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9808104.5 1998-04-16
GBGB9808104.5A GB9808104D0 (en) 1998-04-16 1998-04-16 Digital video screen

Publications (1)

Publication Number Publication Date
WO1999054862A1 true WO1999054862A1 (fr) 1999-10-28

Family

ID=10830452

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/001156 WO1999054862A1 (fr) 1998-04-16 1999-04-15 Ecran video numerique

Country Status (3)

Country Link
AU (1) AU3529599A (fr)
GB (1) GB9808104D0 (fr)
WO (1) WO1999054862A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0619571A1 (fr) * 1993-04-08 1994-10-12 Sagem Sa Afficheur matriciel en couleurs
US5410328A (en) * 1994-03-28 1995-04-25 Trans-Lux Corporation Replaceable intelligent pixel module for large-scale LED displays
DE29622938U1 (de) * 1996-08-07 1997-08-07 Dambach-Werke Gmbh, 76456 Kuppenheim Optische Anzeigevorrichtung
WO1997039436A1 (fr) * 1996-04-15 1997-10-23 Addco Manufacturing, Inc. Panneau d'affichage modulaire ameliore
WO1997048089A1 (fr) * 1996-06-11 1997-12-18 Sfim Trafic Transport Dispositif d'affichage modulaire, module d'affichage et bati d'ensemble correspondants

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0619571A1 (fr) * 1993-04-08 1994-10-12 Sagem Sa Afficheur matriciel en couleurs
US5410328A (en) * 1994-03-28 1995-04-25 Trans-Lux Corporation Replaceable intelligent pixel module for large-scale LED displays
WO1997039436A1 (fr) * 1996-04-15 1997-10-23 Addco Manufacturing, Inc. Panneau d'affichage modulaire ameliore
WO1997048089A1 (fr) * 1996-06-11 1997-12-18 Sfim Trafic Transport Dispositif d'affichage modulaire, module d'affichage et bati d'ensemble correspondants
DE29622938U1 (de) * 1996-08-07 1997-08-07 Dambach-Werke Gmbh, 76456 Kuppenheim Optische Anzeigevorrichtung

Also Published As

Publication number Publication date
AU3529599A (en) 1999-11-08
GB9808104D0 (en) 1998-06-17

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