WO2008055294A1 - Dispositif de projection miniaturisé amélioré - Google Patents

Dispositif de projection miniaturisé amélioré Download PDF

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Publication number
WO2008055294A1
WO2008055294A1 PCT/AU2007/001695 AU2007001695W WO2008055294A1 WO 2008055294 A1 WO2008055294 A1 WO 2008055294A1 AU 2007001695 W AU2007001695 W AU 2007001695W WO 2008055294 A1 WO2008055294 A1 WO 2008055294A1
Authority
WO
WIPO (PCT)
Prior art keywords
projection device
light
light sources
dichroic mirrors
optical axis
Prior art date
Application number
PCT/AU2007/001695
Other languages
English (en)
Inventor
Kevin Soper
Peter Rubinshtein
Danny Jung
Original Assignee
Digislide Holdings Limited
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
Priority claimed from AU2006906179A external-priority patent/AU2006906179A0/en
Application filed by Digislide Holdings Limited filed Critical Digislide Holdings Limited
Priority to AU2007317184A priority Critical patent/AU2007317184A1/en
Publication of WO2008055294A1 publication Critical patent/WO2008055294A1/fr

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/10—Simultaneous recording or projection
    • G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/145—Housing details, e.g. position adjustments thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam

Definitions

  • the present invention relates to a miniaturised projection device and, in particular, to a projection device wherein an image may be provided by the use of a liquid crystal display panel (LCD).
  • LCD liquid crystal display panel
  • the present invention relates to an optical engine used in a miniaturised projection device.
  • the projection device is adapted to be used in a number of applications and is designed to be ruggedised, allowing it to be handled and moved without compromising the image quality.
  • the optical engine as per the present invention can be adapted for use in various projection systems and is particularly suitable for hand held devices due to its design, ruggedness and size.
  • Image projection apparatus have been known for a number of years and fall into two distinct categories, the rear, and forward projection types.
  • a conventional television receiver is a rear projection apparatus
  • a conventional cinema projector is a forward projection apparatus.
  • projection apparatus require sophisticated and complex optical engines and electronic components that are in-built into the apparatus. Frequently the apparatus contain the use of LCD or DLP technologies, or cathode ray tube technologies, that require precision optics to work.
  • the complex optical engines increase the cost of these projectors and they are often large and not able to be applied to. hand held devices. Furthermore they are quite fragile and can be easily damaged or misaligned. They are also typically heavy and cumbersome and are not intended to be truly portable apparatus. Because of this, projection apparatus are carefully stored and moved, and are unsuitable for the displaying of images in portable and mobile environments.
  • a further problem with video projectors as currently known is that the globes required to produce an image also produce a significant amount of heat that needs to be dissipated and require strong fans to produce an air flow around the globe. This does not allow for the miniaturisation of the optical engine and the projection system. Such globes typically also operate at mains Voltage, 240 Volts in Australia, which is not possible for portable devices.
  • Another problem is the use of moving parts in projection systems. Any moving parts will limit the ruggedness of the optical engine and therefore limit its portability and increase its price. It is an object of the present invention to provide a miniaturised projection device that overcomes at least some of the abovementioned problems or provides the public with a useful alternative.
  • a projection device characterised by: at least two distinct light sources adapted to emit light perpendicularly to a corresponding number of dichroic mirrors aligned along an optical axis, each dichroic mirror configured to reflect a single light source whilst allowing passage through of other light sources to an image carrier having an entering polariser, said dichroic mirrors being angled so as to align polarisation of reflected light with said entering polariser.
  • said projection device includes three light sources and two dichroic mirrors, two of said light sources positioned perpendicularly to the optical axis, and the third light source positioned along said optical axis behind the dichroic mirrors so as to emit light there through.
  • said projection device includes three light sources and three dichroic mirrors, said light sources positioned perpendicularly to the optical axis.
  • said dichroic mirrors are angled at approximately 45 degrees to the optical axis.
  • the mirrors are therefore orientated to reflect light towards the image carrier preferably from top or side mounted light sources in order to align polarisation of the reflected light with the nearer polariser on the screen carrier surface. Incorrectly orientated mirrors will result in incorrectly orientated polarisation on the reflected light, which could be orthogonal to the screen carrier polariser.
  • the light source is in the form of a distributed light source from a plurality of light emitting diodes.
  • said projection device includes a red, green and blue light emitting diode, each corresponding mirror being coated to reflect that part of the colour spectrum.
  • said projection device further includes a condenser lens to condense light from the mirrors onto the screen and an objective lens used to focus the image on a distal surface.
  • said image carrier is in the form of a liquid crystal display panel.
  • said projecting device further includes optical elements selected from but not limited to spectrum filters, further polarisers, and further focussing, magnification, collimating and condensing lenses.
  • said projection device includes a frame for holding the light sources and optical components in position.
  • said frame is designed so as to remove heat away from the light sources and optical components by absorption, transmission and/or dissipation.
  • said image carrier includes an antenna associated therewith for receiving image information for use in mobile devices.
  • Figure 1 illustrates a side view of a projection device in accordance with the present invention
  • Figure 2 illustrates a perspective view of the projection device of Figure 1
  • Figure 3 illustrates a top view of the projection device of Figure 1 when used in conjunction with a mobile phone device.
  • Figure 1 shows a side view of a projection device 10.
  • the device 10 includes an optical engine containing all the optical components necessary to construct and project an image from the projection device.
  • a collimated light source emits light through Light Emitting Diodes (LEDs).
  • the LEDs are green 12, blue 14, and red 16, whereby, the green LED 12 is set at the rear of the projection device 10 while the red and blue LEDs 16 and 14, are set at the top of the device.
  • LEDs are driven by 3.5 - 5 Volts DC and the device 10 consumes approximately 2 Watts of power.
  • the low voltage and power use of the device 10 make it particularly suitable for use with mobile devices such as mobile phones, as shown in Figure 3, and PDAs.
  • the device 10 further includes forward and rear dichroic mirrors 18 and 20, set at approximately 45 degrees to the optical path.
  • the mirrors are placed at this angle so that the axis of polarisation created will be in the same direction as a nearer (entering) polariser on the Liquid Crystal Display (LCD) described in further detail below.
  • LCD Liquid Crystal Display
  • Both the dichroic mirrors are specifically coated so as to allow the green part of the colour spectrum from the green LED 12 to pass through the mirrors.
  • the rear dichroic mirror 18, positioned beneath the blue LED 14. at a 45 degree angle, is coated so as to reflect only the blue part of the colour spectrum.
  • the front dichroic mirror 20, positioned beneath the red LED 16 at a 45 degree angle, is coated so as to reflect only the red part of the colour spectrum. Red, green and blue light passes though collimating lenses (not shown) and is reflected and directed by the dichroic mirrors 18 and 20 to form a collimated light source or optical path.
  • This collimated light source is focussed onto a condenser lens 22 and then through the LCD panel 24.
  • the condenser lens 22 and the LCD panel 24 are adapted to be secured and received within the LCD panel block 26.
  • the objective lens passes though the objective or focussing lens 28 and is then projected onto a distal surface for viewing.
  • the objective lens is housed within an objective lens block 30. By moving the block in the horizontal plane along the optical axis of the optical engine, the image being projected onto the distal surface is focussed.
  • the objective lens block 30 may also be adapted to receive or form an antenna for a mobile device which the projection device 10 is used in conjunction with. It is envisaged that the antenna would enable the projection device 10 to receive information relating to an image and then project the transmitted image.
  • the ability to project transmitted images enables the projection device 10 to project detailed transmitted information on a much larger display than the screen embedded in a mobile device, giving the user the ability to more clearly view detailed information, such as satellite photographs from a GPS satellite.
  • all three LED's could be positioned at the top of the device, the device therefore requiring a third dichroic mirror positioned to reflect the green light.
  • the visible spectrum LED's could be replaced with infra red LEDs to provide an image projected in infra red. Such an image could only be seen by a user wearing infrared goggles and could be used for security, defence or similar purposes.
  • optical components forming the optical engine are mounted on or within a frame 32.
  • the frame 32 is made from a heat absorbing, transmitting and heat dissipating material, such as aluminium or an aluminium alloy, and is mechanically strong.
  • the frame 32 must hold the optical components hi perfect alignment to stop artefacts being induced into the projected image as any twisting or warping of the frame will result in a distorted image.
  • the frame is designed so that it acts as a heat sink to remove heat away from the LEDs and other optical components by absorption, transmission and/or dissipation.
  • the LCD panel 24 is particularly susceptible to damage caused by heat and as a result heat management is critical to the longevity of the LCD panel.
  • the optical engine is also arranged so that there is air circulating within the optical components, further cooling the device 10.
  • the frame 32 acts as a heat sink by absorbing, transmitting and/or dissipating heat from the individual LED heat sinks and other components. Because of the high conductivity of aluminium (and similar metals) the frame heats evenly minimising distortion of the frame and reducing the possibility of misalignment of the critical components, ensuring a quality image.
  • the green LED 12 heat sink 34 mounted to the frame 32. Also mounted to the frame is the housing 36 for the blue and red LEDs. In the embodiment shown, there is also a printed circuit board 38 located on top of the housing 36 for control of the LCD panel 24 and operation of the LEDs.
  • the PCB, mounted on the LED heat sinks may further contribute to sense and control the temperature of the LED's and further contain temperatures and sensing devices and so manage current flor of each LED. To save power and heat and to obtain the desired colour and intensity, the LEDs are preferably pulsed on and off.
  • FIG. 2 illustrates the projection device 10 in perspective view. It can be seen from this view that the LCD panel receives information via a ribbon 40 and that the printed circuit board 38 receives sends and receives LED control signals and other information and power from a series of connectors 42. Within the housing 36 there is other electronic circuitry attached to the printed circuit board not shown in the figures.
  • Figure 3 illustrates a top view of a possible embodiment of the projection device 10, used in conjunction with a mobile phone 44. It can be seen that the device 10 is intended to be miniaturised and adapted to be used with a variety of hand held devices.
  • the optical engine is designed so that it has no moving parts and as a result is rugged and robust and able to be adapted for use with portable devices such as this. Any moving parts or delicate circuitry would not be robust enough to withstand the stresses of being used with a portable device that is typically stored in a user's pocket and which may be susceptible to knocks and erratic movement.
  • the optical engine is also designed to maximise the amount of light captured by the LEDs resulting in a greater brightness of the projected image, a better uniformity of image, a better colour clarity and contrast ratio, and a better centre to corner ratio of the projected image.
  • the lens design can also capture up to 98% of the light generated from the LEDs and as a result lower power is required to maintain brightness of the image projected, making the device 10 suitable for low powered hand held devices.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)

Abstract

La présente invention concerne un dispositif de projection miniaturisé, caractérisé par l'utilisation de diodes électroluminescentes (DEL) de couleur rouge, verte et bleue adaptées pour émettre de la lumière relativement à un nombre correspondant de miroirs dichroïques alignés le long d'un axe optique, chaque miroir dichroïque étant configuré pour réfléchir une seule source lumineuse tout en laissant les autres sources lumineuses le traverser en direction d'un support d'image, tel qu'un écran à cristaux liquides (LCD) comportant un polariseur d'entrée. Les miroirs dichroïques sont de préférence inclinés d'environ 45 degrés pour assurer la polarisation de la lumière réfléchie au moyen du polariseur d'entrée du LCD. Le dispositif de projection de l'invention présente en outre un bâti et des optiques conçus pour évacuer la chaleur des sources lumineuses et des composants optiques par absorption, transmission et/ou dissipation.
PCT/AU2007/001695 2006-11-06 2007-11-06 Dispositif de projection miniaturisé amélioré WO2008055294A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2007317184A AU2007317184A1 (en) 2006-11-06 2007-11-06 An improved miniaturised projection device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU2006906179A AU2006906179A0 (en) 2006-11-06 An improved miniaturised optical engine for a projection system
AU2006906179 2006-11-06
AU2006906426A AU2006906426A0 (en) 2006-11-17 An improved miniaturised projection system
AU2006906426 2006-11-17

Publications (1)

Publication Number Publication Date
WO2008055294A1 true WO2008055294A1 (fr) 2008-05-15

Family

ID=39364094

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2007/001695 WO2008055294A1 (fr) 2006-11-06 2007-11-06 Dispositif de projection miniaturisé amélioré

Country Status (2)

Country Link
AU (1) AU2007317184A1 (fr)
WO (1) WO2008055294A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040085486A1 (en) * 2002-10-28 2004-05-06 Hiromi Katoh Optical shifter and projection type optical display system
US20050179873A1 (en) * 2004-01-21 2005-08-18 Hitachi, Ltd. Projection type video display apparatus
US20060227302A1 (en) * 2005-04-11 2006-10-12 Lumileds Lighting U.S., Llc Illuminators using reflective optics with recycling and color mixing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040085486A1 (en) * 2002-10-28 2004-05-06 Hiromi Katoh Optical shifter and projection type optical display system
US20050179873A1 (en) * 2004-01-21 2005-08-18 Hitachi, Ltd. Projection type video display apparatus
US20060227302A1 (en) * 2005-04-11 2006-10-12 Lumileds Lighting U.S., Llc Illuminators using reflective optics with recycling and color mixing

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
TEXAS INSTRUMENTS: "DLP Products shows new developments in Pico-Projection", 10 March 2007 (2007-03-10), Retrieved from the Internet <URL:http://www.dlp.com/tech/press_releases_details.aspx?id=1336> *
WERNER K.: "Putting a Projection in Your Cell Phone", DISPLAY DAILY, 13 February 2006 (2006-02-13), Retrieved from the Internet <URL:http://www.displaydaily.com/2006/02/13/putting-a-projector-in-your-cell-phone> *

Also Published As

Publication number Publication date
AU2007317184A1 (en) 2008-05-15

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