GB2360605A - A display device with point light sources and fresnel lens - Google Patents

A display device with point light sources and fresnel lens Download PDF

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Publication number
GB2360605A
GB2360605A GB0007142A GB0007142A GB2360605A GB 2360605 A GB2360605 A GB 2360605A GB 0007142 A GB0007142 A GB 0007142A GB 0007142 A GB0007142 A GB 0007142A GB 2360605 A GB2360605 A GB 2360605A
Authority
GB
United Kingdom
Prior art keywords
fresnel lens
light sources
point light
optical axis
chamber
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.)
Granted
Application number
GB0007142A
Other versions
GB0007142D0 (en
GB2360605B (en
Inventor
Stuart Best
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.)
Central Research Laboratories Ltd
Original Assignee
Central Research Laboratories 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 Central Research Laboratories Ltd filed Critical Central Research Laboratories Ltd
Priority to GB0007142A priority Critical patent/GB2360605B/en
Publication of GB0007142D0 publication Critical patent/GB0007142D0/en
Priority to PCT/GB2001/000320 priority patent/WO2001073480A2/en
Publication of GB2360605A publication Critical patent/GB2360605A/en
Application granted granted Critical
Publication of GB2360605B publication Critical patent/GB2360605B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels
    • G02B30/56—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels by projecting aerial or floating images

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

A display device comprises a chamber having substantially opaque walls 1 and a window 2 located in one wall, the window consisting of a Fresnel lens, such that light from an illuminated object 3 placed in the chamber will be projected out through the Fresnel lens along the optical axis 4 of the lens to form a real image 5 suspended in free space. A plurality of substantially point light sources 6 are provided in the chamber located adjacent the Fresnel lens and spaced around the optical axis 4 of the Fresnel lens, the point light sources 6 being arranged such that in use each provides light which shines through the Fresnel lens towards said real image 5 and which appears as a plurality of substantially point light sources lying along a radial path towards the optical axis of the Fresnel lens when viewed from the direction of said real image. The light sources 6 may be flashed in a random or predetermined sequence to enhance the "starburst" or "tunnel" effect and may be manufactured from LEDs (light-emitting diodes).

Description

2360605 A DISPLAY DEVICE This invention relates to a display device, and
particularly, though not exclusively, to a display device for providing a three dimensional effect for use 5 in advertising signage and other applications.
One known display device of this general type is disclosed in DE 26 12 566 A. This document discloses a chamber comprising dark coloured walls and a window in one wall consisting of or including a Fresnel lens. In use, an illun-dnated image or object is placed in the chamber, and light from the image or object is projected out through the Fresnel lens to form a real image apparently suspended in free space. The object or image may be placed on a turntable arrangement so that it appears to rotate with time.
A disadvantage with this prior art arrangement is that the image is only visible over a restricted angle of view.
According to a first aspect of the present invention, there is provided a display device as specified in the claims.
1 Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings, in which:Figure 1 shows a cross-section of a first embodiment of the invention, and Figure 2 shows the images seen when looking towards the window in use.
Figtire 1 shows a display device comprising a chamber having substantially opaque walls (1) and a window (2) comprising one wall or being located in one wall, the window consisting of or including a Fresnel lens, such that light from an illuminated object (3) or image placed in the chamber will be projected out throue,h the Fresnel lens along the optical axis (4) of the lens to form a real image (5) suspended in free space. A plurality of substantially point light sources (6) are provided in the chamber located adjacent the Fresnel lens and spaced around the optical axis of the Fresnel lens, the point light sources being arranged such that in use each provides light which shines through the Fresnel lens towards 2 said real image and which appears as a plurality of substantially point light sources (7) lying along a radial path towards the optical axis of the Fresnel lens when viewed from the direction of said real image. The substantially point light sources are preferably light emitting diodes, and can each have the same or a 5 different output light colour.
Such displays may have a plurality of co-axial Fresnel lenses, in which case the point light sources are preferably placed on the side of the lens closest to the illuminated object adjacent the face of the lens facing the object, so that they can be seen directly through both lenses by an observer.
The ridges on the Fresnel lenses generate multiple images of each point light source, which appear on a radial line from the point light source toward the optical axis of the lens, as shown in Figure 2. This gives a "starburst" or "tunnel" effect which leads the eye to the object being displayed.
The light sources may be flashed in a random or predetern-dned sequence to enhance this '.'starburst" or "tunnel" effect. In the present embodiment, the light emitting diodes can be seen over a wide viewing angle (almost 180 degrees) which means that a viewerfs attention can be attracted to the unit even when the s-uspended image of the object inside the chamber is not visible to them.
-a 4

Claims (2)

  1. 3 CLAIMS
    A display device comprising a chamber having substantially opaque walls and a window comprising one wall or being located in one wall, the window consisting of or including a Fresnel lens, such that light from an illuminated object or image placed in the chamber will be projected out through the Fresnel lens along the optical axis of the lens to form a real image suspended in free space, characterised in that a plurality of substantially point light sources are provided in the chamber located adjacent the Fresnel lens and spaced around the optical axis of the Fresnel lens, the point light sources beina, arranged such that in use each provides light which shines through the Fresnel lens towards said real image and which appears as a plurality of substantially point light sources lying along a radial path towards the optical axis of the Fresnel lens when viewed from the direction of said real image.
  2. 2. A display device as claimed in claim 1 in which the light sources are made to flash with time in a predetermined or random sequence.
GB0007142A 2000-03-24 2000-03-24 A display device with point light sources and fresnel lens Expired - Fee Related GB2360605B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0007142A GB2360605B (en) 2000-03-24 2000-03-24 A display device with point light sources and fresnel lens
PCT/GB2001/000320 WO2001073480A2 (en) 2000-03-24 2001-01-26 A display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0007142A GB2360605B (en) 2000-03-24 2000-03-24 A display device with point light sources and fresnel lens

Publications (3)

Publication Number Publication Date
GB0007142D0 GB0007142D0 (en) 2000-05-17
GB2360605A true GB2360605A (en) 2001-09-26
GB2360605B GB2360605B (en) 2003-09-03

Family

ID=9888319

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0007142A Expired - Fee Related GB2360605B (en) 2000-03-24 2000-03-24 A display device with point light sources and fresnel lens

Country Status (2)

Country Link
GB (1) GB2360605B (en)
WO (1) WO2001073480A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2612566A1 (en) * 1975-12-15 1977-06-23 Werner Rusterholz DEVICE FOR PROJECTING A THREE-DIMENSIONAL IMAGE OF AN OBJECT IN THE OUTDOOR SPACE
GB2155651A (en) * 1984-03-07 1985-09-25 Peter Colin Roy Nightingale Stereo-visual simulator
WO1989009423A1 (en) * 1988-03-31 1989-10-05 Laser 681 S.R.L. Three-dimensional image projector
EP0916986A1 (en) * 1997-11-14 1999-05-19 Toptel Limited Three-dimensional image projector

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4261657A (en) * 1978-08-09 1981-04-14 Reiback Earl M Optical display device
WO1999046638A1 (en) * 1998-03-11 1999-09-16 Optikos Corporation Multimedia advertising system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2612566A1 (en) * 1975-12-15 1977-06-23 Werner Rusterholz DEVICE FOR PROJECTING A THREE-DIMENSIONAL IMAGE OF AN OBJECT IN THE OUTDOOR SPACE
GB2155651A (en) * 1984-03-07 1985-09-25 Peter Colin Roy Nightingale Stereo-visual simulator
WO1989009423A1 (en) * 1988-03-31 1989-10-05 Laser 681 S.R.L. Three-dimensional image projector
EP0916986A1 (en) * 1997-11-14 1999-05-19 Toptel Limited Three-dimensional image projector

Also Published As

Publication number Publication date
GB0007142D0 (en) 2000-05-17
WO2001073480A2 (en) 2001-10-04
WO2001073480A3 (en) 2001-12-20
GB2360605B (en) 2003-09-03

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040324

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040324