EP0199516A2 - Dispositifs d'affichage - Google Patents

Dispositifs d'affichage Download PDF

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Publication number
EP0199516A2
EP0199516A2 EP86302743A EP86302743A EP0199516A2 EP 0199516 A2 EP0199516 A2 EP 0199516A2 EP 86302743 A EP86302743 A EP 86302743A EP 86302743 A EP86302743 A EP 86302743A EP 0199516 A2 EP0199516 A2 EP 0199516A2
Authority
EP
European Patent Office
Prior art keywords
apertures
display
arrangement
pixel
brightness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86302743A
Other languages
German (de)
English (en)
Inventor
Ralph Desmond Nixon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teledyne UK Ltd
Original Assignee
English Electric Valve Co 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 English Electric Valve Co Ltd filed Critical English Electric Valve Co Ltd
Publication of EP0199516A2 publication Critical patent/EP0199516A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F11/00—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position
    • G09F11/24—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position the advertising or display material forming part of a moving band, e.g. in the form of perforations, prints, or transparencies
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/06—Signs, boards or panels, illuminated from behind the insignia using individual cut-out symbols or cut-out silhouettes, e.g. perforated signs

Definitions

  • This invention relates to a display arrangement in which a bright image can be presented in a particularly simple manner, even though the image may be of a complex nature, and may be readily interchangeable with other images.
  • a situation in which this kind of display arrangement may be required is to advertise products in arenas in areas where attention is focussed, for example, on either side of a scoreboard or video display.
  • front-lit posters are used to convey such information. By their very nature, they are difficult to change for another poster, and therefore the same poster tends to remain on display for a long period of time.
  • back-lit transparencies carrying an optical image can be used to present a bright display, but it is difficult and very expensive to produce a large area display of this kind, and they cannot easily be altered or updated.
  • the present invention seeks to provide an improved and more adaptable display arrangement.
  • a display arrangement includes an array of pixels consisting of illuminated back-lit apertures having light transmissive properties related to the degree of brightness required for the corresponding pixel and arranged so that the brightness varies from one part of the array to another.
  • a display arangement for presenting a two-dimensional colour display includes an array of individual pixels each of which consists of one or more back-lit apertures, each pixel being associated with a colour filter element and having light transmissive properties dependent on the degree of brightness required of the pixel arranged so that the brightness varies from one part of the array to another.
  • a display arrangement for presenting a two-dimensional display includes a plurality of elongate masks each defining a line array of pixels, the masks being apertured to permit transmission of light falling upon the rear surface of each screen, the nature of the apertures being related to the degree of brightness required for the corresponding pixel so that the brightness varies from one part of the array to another.
  • each pixel may be formed by a cluster of closely spaced apertures which act together to provide the required degree of brightness and/or colour for that picture point.
  • the information content of the display may take any required form, e.g. stylised data or life-like pictures and artistic compositions.
  • a plurality of common light sources will each light a plurality of pixels, which will lead to a uniform illumination of the apertures (assuming that no allowance need be made for absorption by any interposed filters).
  • the display consists of a pattern of points of light which has no direct relationship with the overall nature of the displayed image, scene or data, but in which the individual points of light are defined by back-lit apertures having properties dictated by the nature of the pixel which it displays.
  • the optical image so produced is intended to be viewed at a sufficiently great distance such that the separate pixels are at the limits of normal optical resolution of the eye, although the display may be viewed at much closer distances if the discrete nature of the picture points is intended to contribute to the overall effect.
  • a relatively small area display is utilised to explain the principle of operation of the invention, and to indicate the way in which visual information is presented to, and perceived by, a person viewing the display.
  • the display consists of a regular two-dimensional array of pixels 1, each of which represents the finest resolvable picture element.
  • the array consists of eight rows and eight columns of pixels, making sixty-four separate pixels.
  • a stylised numeral '5' is used to illustrate the way in which the image is formed, and each pixel is arranged to emit light in proportion to that area of it which is notionally overlaid by the numeral, it being understood that the broken line used to represent the numeral is purely for purposes of explanation, and the display itself consists merely of an array of back-lit apertures 2, each aperture being located at the centre point of a pixel.
  • the amount of light emitted by each pixel is, in this example, determined by the size of the aperture, it being assumed that all apertures receive exactly the same intensity of illumination. It will thus be realised that the array of apertures 2, when viewed from a sufficient distance such that individual apertures appear to merge, is seen as the numeral '5'.
  • a cluster of small apertures could be provided, the number in the cluster then controlling the brightness.
  • the display is in effect, in monochrome, i.e. its colour does not contribute-to the information which it imparts, but by arranging that the pixels emit light in the three primary colours, a colour display results.
  • a module comprising sixty-four elemental display areas 3, each approximately 18 mm square and on a 25.4 mm centre.
  • a colour filter is associated with each elemental area 3 either red (R), green (G) or blue (B), as shown.
  • Each group 4 of elemental areas, (consisting of two green filters, one red filter and one blue filter) forms a picture point, and the filter properties are chosen such that equal areas of the filters forming a group integrate to white light.
  • an apertured screen is placed in front of the pattern of filters.
  • Figure 3 One such implementation of a display arrangement is shown in Figure 3.
  • the display arrangement consists of three main parts, a source of illumination 10, a large pattern of colour filters 11, and an array of back- lit apertures 12.
  • the pattern 11 of colour filters consists of a large number of the modules 18 which are shown in Figure 2, the modules being aligned to form rows and columns as shown.
  • the source of illumination 10 consists of a number of troughs 13, each having two rows of fluorescent tubes 14, which overlap to give uniform illumination. Each trough has a reflective surface to direct the light in a forwards direction on to the pattern 11 of filters. When viewed from a distance, the red, green and blue pixels formed by illuminating the colour filters which make up the screen, appear white.
  • the array of apertures 12 is positioned in front of the pattern 11 of colour filters to perform, on a larger scale, the function of the pattern of apertures shown in Figure 1.
  • the apertures are formed in a plurality of opaque tapes 15 mounted side by side.
  • Each tape 15 has a width corresponding to that of a module of colour filters, i.e. it carries eight pixels over its width.
  • Each tape 15, which is made for example from black anodised aluminium is flexible, and is several times longer than the width of the whole display.
  • an analogue-to-digital converter is used to produce a stored set of digital numbers, which corresponds to the brightness of the coloured pixels in the picture which is to be reproduced as a still display. These numbers are used to control the size of holes which are punched in the elongate tapes. Each hole determines the brightness of a particular pixel.
  • These digital numbers may be used either to control the selection of a punch size for example, in a Wiedermann press, or to control the penetration depth of a compound punch.
  • An alternative method of determining the brightness of a pixel is to alter not the aperture size, but the aperture frequency. That is, the elongate tapes are punched with apertures of uniform size, one or more being associated with each pixel. In this method, the digital numbers referred to above will determine the position at which an aperture is punched.
  • An alternative method of producing the holes in the tape is to use a photo-resist exposure and etching process.
  • Each tape 15, having been punched, is fed along slotted tracks 16 between the module rows, (which in practice could be mounted on the front surface of the structure carrying the pattern of filter) and carried at both ends on to drums 17.
  • One or both drums may be motorised to assist movement and positioning of the tapes. Tensioning arrangements would be required for the drums.
  • the tapes and their slotted tracks could be arranged to run vertically, as this would reduce the friction loading in the slotted tracks.
  • the motorised drums can be arranged to hold rolls of the elongate tapes carrying a number of pictures which can be readily located and registered by indexing marks in the tapes, so that one displayed image can be easily and rapidly changed for another, or parts of it can be updated.
  • the pattern of colour filters is positioned between the source of illumination and the back-lit apertures, this need not be the case as the relative positions of the filters and the apertures could be interchanged.
  • This display arrangement could be used for any size of display, including single digits and for pro-formas, for example, time-tables and airport displays, as well as projecting conventional picture images.
  • the display can be very bright, as powerful and efficient lamps can be used to illuminate the apertures, and the discrete nature of the visual image becomes quite acceptable at a sufficiently great viewing distance, e.g. at the limits of optical resolution of the individual apertures. It is envisaged that the overall linear dimensions of the display will be of the order of several metres.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
EP86302743A 1985-04-24 1986-04-14 Dispositifs d'affichage Withdrawn EP0199516A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8510458 1985-04-24
GB08510458A GB2174229A (en) 1985-04-24 1985-04-24 Display arrangements

Publications (1)

Publication Number Publication Date
EP0199516A2 true EP0199516A2 (fr) 1986-10-29

Family

ID=10578137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86302743A Withdrawn EP0199516A2 (fr) 1985-04-24 1986-04-14 Dispositifs d'affichage

Country Status (2)

Country Link
EP (1) EP0199516A2 (fr)
GB (1) GB2174229A (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB291912A (en) * 1927-03-26 1928-06-14 Joseph Foster Improvements in and relating to devices for advertising purposes
GB331262A (en) * 1929-01-29 1930-06-30 Travelad Corp Improvements relating to display devices
GB413003A (en) * 1933-01-02 1934-07-02 George Stanley Shaw Improvements in electric signs
GB460617A (en) * 1935-04-11 1937-02-01 Holophane Ltd Improvements in and relating to lighting apparatus for signalling, advertising, and the like
GB489869A (en) * 1937-02-17 1938-08-05 Benjamin Ernest Tyerman Improvements in signs or displays
GB1561302A (en) * 1976-04-30 1980-02-20 Eno B Multi-colour light display unit
GB1602608A (en) * 1978-05-31 1981-11-11 Turney P S Display device
US4345395A (en) * 1980-12-01 1982-08-24 Gloria Grassi Method and apparatus for producing day-night pictures
GB2144254A (en) * 1983-07-19 1985-02-27 Peter Brian Johnson Real-illuminated sign

Also Published As

Publication number Publication date
GB8510458D0 (en) 1985-05-30
GB2174229A (en) 1986-10-29

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Inventor name: NIXON, RALPH DESMOND