WO2004104669A1 - Dispositif d'affichage laser optique ligne par ligne - Google Patents

Dispositif d'affichage laser optique ligne par ligne Download PDF

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Publication number
WO2004104669A1
WO2004104669A1 PCT/IB2004/050691 IB2004050691W WO2004104669A1 WO 2004104669 A1 WO2004104669 A1 WO 2004104669A1 IB 2004050691 W IB2004050691 W IB 2004050691W WO 2004104669 A1 WO2004104669 A1 WO 2004104669A1
Authority
WO
WIPO (PCT)
Prior art keywords
laser beam
display device
foil
display
line
Prior art date
Application number
PCT/IB2004/050691
Other languages
English (en)
Inventor
Dirk De Bruin
Gerrit Oversluizen
Pieter J. Engelaar
Oscar H. Willemsen
Rogier Winters
Hugo M. Visser
Ruediger J. Lange
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2004104669A1 publication Critical patent/WO2004104669A1/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
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0825—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a flexible sheet or membrane, e.g. for varying the focus
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide

Definitions

  • the present invention relates to a display device comprising means for guiding a plurality of laser beams in parallel paths across the display, and light exiting means arranged to extract light from a laser beam out of the display.
  • a particular category of display device comprises a light source and several pixels, each of which can be activated to extract light from the light source.
  • each pixel can have several different active levels, achieved by controlling the duration of activation (pulse width modulation), or of the intensity of the light source (pulse amplitude modulation).
  • Such displays are normally referred to as "optical" displays, and examples include foil displays and fiber displays.
  • Optical displays using laser as light source are well know in the art.
  • US 6,453,100 discloses a display where light is directed into an optical guide plate, and is decoupled out of the plate by activation of one pixel at a time.
  • the light maybe generated by a laser.
  • the object of the present invention is to provide an optical laser display device which can be more easily addressed.
  • a display device of the kind mentioned by way of introduction further comprising means for addressing the display by activating the light exiting means along one line, perpendicular to said laser beam paths, at a time, and, for each thus selected line, guiding the at least one laser beam in a selected number of the paths, to thereby emit light from corresponding intersections with the selected line.
  • This design makes it possible to address the laser display using line-at-a-time addressing.
  • the rows are consecutively selected by addressing the light exiting means, and for each row, a laser is directed along the desired columns, so that pixels corresponding to the intersection of the illuminated columns and the selected row will emit light.
  • the display device preferably comprises a laser unit which can be arranged to emit one laser beam, and to sweep this laser beam through said parallel paths, or arranged to emit one laser beam for each parallel path.
  • the display comprises a front plate and a back plate, and the laser beam(s) is/are guided between these plates in parallel with the surfaces of the plates, and the light exiting means comprises a flexible foil arranged between the plates.
  • the foil is attached to the front plate in a first area extending across the laser beam(s), and to the back plate in a second area extending across the laser beams.
  • the device further comprises means to control along which row the foil bridges the distance between the plates. Laser beams introduced into the gap between the plates will propagate until they hit the foil crossing, and this crossing can be used to emit light out through the front plate.
  • the foil can for example be adapted to scatter and/or reflect the laser beam(s), in order to make the display emit light.
  • the laser beam guiding means comprises a wave guide in which the laser beam(s) is/are guided by means of total internal reflection, and the light exiting means are arranged to frustrate said internal reflection locally along a line.
  • the light exiting means can for example comprise an electromechanically operable foil arranged on one side of the wave guide, and means for bringing this foil into contact with the wave guide.
  • the light exiting means comprise means for electric or accousto-optical switching of the refractive index of the wave guide.
  • FIG. 1 is a perspective view of a display device according to a first embodiment of the invention
  • Fig. 2 is a side view of a first variant of the display device in fig 1.
  • Fig. 3 is a side view of a second variant of the display device in fig 1.
  • Fig. 4 is a perspective view of a second embodiment of the invention.
  • a first embodiment of the invention is illustrated in figs 1 - 3.
  • the display device comprises a back plate 1 and a transparent front plate 2 which are arranged in parallel planes with a gap 3 in between.
  • a laser unit 20 is arranged to emit one or several laser beams 4 in parallel paths into the gap 3, parallel to the surfaces of both plates 1, 2, and these paths define the columns of the display.
  • a movable foil 5 is arranged inside the gap 3, which may be provided with a vacuum.
  • the foil 5 comprises a conducting layer 6, and an insulating layer 7.
  • the foil 5 is attracted to the back plate 1 along a first edge la extending perpendicularly across all columns, and to the front plate 2 along a second edge 2a, likewise extending perpendicularly across all columns.
  • the attraction to the edges la, 2a can be permanent, for example using adhesive, or semi-permanent, for example creating a constant electromagnetic force by applying a suitable voltage.
  • the area between the edges la, 2a define the active display, i.e. the area in which light can be emitted.
  • the foil bridges the gap between the plates.
  • the angle ⁇ between the foil and the plates at this point of crossing 8 is around 45°.
  • the plates are provided with electrodes 9, 10 that run perpendicularly to the laser beams. These electrodes define the rows of the display.
  • the foil can be attracted to the electrodes by applying a voltage difference between the conducting foil, here connected to ground potential, and the electrodes 9, 10 on either of the plates.
  • the electrodes 9a, 10a are supplied with a voltage such that the foil is attracted to the back plate 1.
  • the electrodes 9b, 10b are applied with a voltage such that the foil is attracted to the front plate 2.
  • the foil can be attracted to one of the plates 1 or 2, or be set to a "floating" condition, by applying suitable voltages.
  • the foil crossing 8 can be moved by changing the voltage applied to the appropriate electrodes 9, 10.
  • the electrodes 10 on the back plate 1 are covered by an insulating layers 11, in order to avoid a short circuit, but alternatively, as illustrated in fig 3, the foil 5 can be provided with two insulating layers 7a and 7b, one on each side of the electrode layer 6.
  • the foil crossing 8, which thus can be moved to any selected row of the display, is used to direct the laser beam out through the front plate 2.
  • the foil is preferably covered with either a light scattering layer 12 or with a light reflecting layer 13, which preferably also forms the insulating layer 7.
  • the laser beam 4 is scattered when it hits the foil crossing 8, so that it becomes visible at through the front plate 2, as illustrated in fig 2.
  • the laser beam 4 is reflected out through the front plate 2 when it hits the foil crossing, as illustrated in fig 3.
  • a light scattering layer 15 is preferably deposited on the front plate 2, to provide for a reasonable viewing angle. Diverging lenses could also be used for this purpose.
  • the display in figs 1 - 3 is addressed by consecutively selecting the rows, one at a time, by applying appropriate voltages or currents to the electrodes 9, 10 as described above. Then, for each selected row, laser beams are directed into selected columns. Light will be emitted from the display from the pixels corresponding to the intersections of these laser beams with the selected row.
  • a second embodiment of the invention is illustrated in fig 4.
  • a laser unit 20 is again arranged to direct one or several laser beams 21 in parallel paths, this time into an optical wave guide 22, here in the form of a thin (preferably 0.01-0.5 mm thickness) transparent plate, e.g. glass.
  • an optical wave guide 22 here in the form of a thin (preferably 0.01-0.5 mm thickness) transparent plate, e.g. glass.
  • TIR total internal reflection
  • the display further comprises means 23, 25 for frustrating the total internal reflection (TIR) along a horizontal line extending across all columns, i.e. a row.
  • TIR total internal reflection
  • a foil 23 is arranged on the surface of the light guide 22, and is arranged to be deformed along a line 24 by applying a voltage 25 to two end points of the line.
  • Such voltage controlled bending of a foil for frustrating an internal reflection has been disclosed in US 5771321, incorporated herewith by reference.
  • Other well known ways to frustrate the TIR are switching the refractive index electrically (US 6141465, US 5647036), and by means of acousto-optic effect (US 5106181), also incorporated herewith by reference.
  • the display in fig 4 is addressed similarly as the display in figs 1 - 3.
  • the rows are selected consecutively, by frustrating the internal reflection of the plate 22 along a line 24 as described above.
  • laser beams 21 are directed into the plate 22. Light will be emitted from the plate from the pixels corresponding to the intersections of these laser beams with the selected row.
  • the vertical resolution is also determined by the size of the area of decoupling, i.e. the size of the area of contact between the foil 23 and the plate 22. While a small contact area improves resolution, it also means that the efficiency of the display is reduced (less light is emitted from each pixel). In order to compensate this reduced efficiency, the wave guide must be made thinner (each laser beam is reflected more often, thereby increasing the chance of the laser beam hitting the contact area). In other words there is a trade off between resolution (contact area) and thickness of the wave guide, which must be determined depending on the implementation. It is estimated that a pixel size of 0.2 mm (i.e.
  • the laser unit 20 in figs 1 and 4 can include as many lasers as there are columns in the display. Alternatively, the beam of one or several lasers is swept over the columns. In order to reduce the angular sweep required to cover the entire display, the display can be divided into several segments, each addressed by their own laser. The more lasers used, the less power needed per laser, and the less angular sweep needed for each laser.
  • a lasers beam can be swept by directing it onto e.g. a rotating polygon mirror, an acousto-optic crystal or a vibrating mirror. Before entering the display itself (the gap 3 or the plate 22), the swept laser beam should be redirected to be parallel to the column direction. This could for example be done by means of a lens. Alternatively, a beam is swept using a rotating prism, preferably in the shape of a rectangular parallelepiped.
  • one or several sets of three different colored lasers may be used, or one or several (near) UV lasers in combination with colored phosphors may be used.
  • colors may be generated at different times. For example, first the red line is 'written', then the green and then the blue line. However, this is not required: the three lasers generating the colors may also address the same pixels at the same time. The relative powers from the three lasers determines the perceived color of the pixel.

Abstract

Dispositif d'affichage comportant des moyens (1, 2) de guidage d'au moins un faisceau laser (4) selon des trajectoires parallèles traversant l'afficheur, et des moyens (5) de sortie de lumière adaptés pour extraire la lumière d'un faisceau laser de l'afficheur. L'afficheur comporte également des moyens (9, 10) d'adressage dudit afficheur par activation desdits moyens de sortie de lumière sur une ligne (8) à la fois, cette ligne étant perpendiculaire auxdits faisceaux laser (4), et par activation, pour chaque ligne ainsi sélectionnée, d'un nombre choisi de faisceaux laser (4) de manière à émettre de la lumière à partir des points correspondants de croisement de ladite ligne. Cette configuration permet l'adressage de l'afficheur laser par adressage ligne par ligne. Les lignes sont successivement choisies par adressage des moyens de sortie de lumière, et, pour chaque ligne, un faisceau laser est dirigé le long des colonnes voulues de sorte que des pixels correspondants au pouvoir de croisement entre les colonnes éclairées et la ligne choisie émettent de la lumière.
PCT/IB2004/050691 2003-05-22 2004-05-13 Dispositif d'affichage laser optique ligne par ligne WO2004104669A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03101482.2 2003-05-22
EP03101482 2003-05-22

Publications (1)

Publication Number Publication Date
WO2004104669A1 true WO2004104669A1 (fr) 2004-12-02

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ID=33462208

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Application Number Title Priority Date Filing Date
PCT/IB2004/050691 WO2004104669A1 (fr) 2003-05-22 2004-05-13 Dispositif d'affichage laser optique ligne par ligne

Country Status (2)

Country Link
TW (1) TW200508656A (fr)
WO (1) WO2004104669A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737014A (en) * 1983-05-16 1988-04-12 Mino Green Controllable optical waveguide
US5106181A (en) * 1989-04-12 1992-04-21 Rockwell Iii Marshall A Optical waveguide display system
US5771321A (en) * 1996-01-04 1998-06-23 Massachusetts Institute Of Technology Micromechanical optical switch and flat panel display

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737014A (en) * 1983-05-16 1988-04-12 Mino Green Controllable optical waveguide
US5106181A (en) * 1989-04-12 1992-04-21 Rockwell Iii Marshall A Optical waveguide display system
US5771321A (en) * 1996-01-04 1998-06-23 Massachusetts Institute Of Technology Micromechanical optical switch and flat panel display

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JOUKO VIITANEN ET AL: "FIBER OPTIC LIQUID CRYSTAL DISPLAYS", SPIE HIGH-DEFINITION VIDEO, XX, XX, vol. 1976, 1993, pages 293 - 302, XP000534173 *

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