WO2007039850A1 - A laser projection system based on a luminescent screen - Google Patents
A laser projection system based on a luminescent screen Download PDFInfo
- Publication number
- WO2007039850A1 WO2007039850A1 PCT/IB2006/053492 IB2006053492W WO2007039850A1 WO 2007039850 A1 WO2007039850 A1 WO 2007039850A1 IB 2006053492 W IB2006053492 W IB 2006053492W WO 2007039850 A1 WO2007039850 A1 WO 2007039850A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laser
- light source
- projection system
- light
- laser light
- Prior art date
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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
-
- 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
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/12—Function characteristic spatial light modulator
Definitions
- the present invention relates to a laser projection system consisting of at least one first laser light source, a projection screen and a spatial light modulator for projecting a laser beam of said laser light source to form an image on said projection screen, said projection screen comprising a luminescent layer which upon excitation by said laser beam emits blue light.
- lasers provide a dramatic advantage, allowing for much smaller display sizes and therefore hold a huge cost-reduction potential.
- Several other advantages of lasers make them a highly desired light source for projection.
- the lack of suitable laser light sources, in particular diode lasers at proper wavelengths in the visible wavelength range, is until now the major obstacle for laser- based projection systems. While red laser diodes are widely available for wavelengths ranging from 630 nm into the infrared region, efficient blue diodes are until now only available in ultraviolet and violet wavelength ranges, which are not suited for the human eye.
- JP 2003-287802 discloses a laser projection system according to the preamble of present claim 1.
- this projection system three laser light sources are provided, the beams of which are projected by a spatial light modulator to form an image on a projection screen. Two of the laser light sources emit light of two of the three colors required for RGB projection.
- the excitation light source is a semiconductor laser that emits ultraviolet light, wherein the luminescent layer converts this ultraviolet light to blue light.
- the excitation light source is preferably a 405 nm laser diode, since these diodes are readily available. At the wavelength of 405 nm, the luminescent material of the above document has only a small absorption resulting in poor conversion efficiency.
- the object is achieved with the laser projection system of present claim 1.
- Advantageous embodiments of the system are subject of the sub claims and are furthermore described in the following description and example for carrying out the invention.
- the proposed laser projection system consists of at least one first laser light source, a projection screen and a spatial light modulator for projecting a laser beam of said first laser light source to form an image on the projection screen.
- the spatial light modulator may be any light modulator, known for example from other projection systems.
- the projection screen comprises a luminescent layer which upon excitation by said laser beam emits blue light.
- M Sr, Ba, Ca; 0 ⁇ x ⁇ 1; 0 ⁇ a ⁇ 1; 0 ⁇ a ⁇ 1) as a luminescent material.
- the laser light of a first laser light source emitting in the region of 405 nm is efficiently converted to a fluorescent or phosphorescent light in the region of 450-460 nm.
- the inventors of the present projection system found this material which surprisingly has significantly better conversion efficiency for an excitation wavelength of 405 nm than the known material of JP 2003-287802.
- the present projection system allows the use of commercially available 405 nm laser diodes to produce blue light on the projection screen.
- the application of the luminescent layer to the projection screen can be done in several ways, e.g. by a coating technique, known to the skilled person.
- the proposed projection system comprises at least three different laser light sources, the first laser light source, a second laser light source and a third laser light source emitting at different wavelengths. Selecting the wavelength of the second and third laser light sources appropriately, a RGB laser projection system can be realized.
- a red laser diode can be used, based for example on the GaAs material system.
- a frequency doubled Nd: YAG laser or an up-conversion laser can be used for example.
- the luminescent layer has to contain a further material converting the light of the second or third laser light source to red or green light.
- the second or third laser light source in such an embodiment emits ultraviolet or violet light. This light, naturally, must have a different wavelength than the light of the first laser light source.
- the two luminescent materials, the material for generating the blue light and the material for generating the red or green light must have absorption bands that differ, so that these materials are only exited by the light of the corresponding laser light source.
- One material must absorb the radiation from the first laser light source with preferable no absorption in the wavelength region of the second or third laser light source.
- the other material must absorb the radiation from the second or third laser light source with preferable no absorption in the wavelength region of the first laser light source.
- a material can be used in the luminescent layer, which allows up- conversion to the green or red light.
- an Er 3+ -doped substance in the luminescent layer can very efficiently absorb two infrared photons and emit one green photon at 550 nm.
- the first laser light source is preferably a GaN laser diode emitting in the wavelength region of 405 nm.
- other laser diodes emitting in the violet or ultraviolet range for example at 385 nm, can be used.
- laser diodes based on the GaAs material system and emitting in the wavelength range from 630 nm up to the infrared range are preferred.
- the above ultraviolet or violet laser diodes are preferably used for generating the green light in connection with a down-converting luminescent material.
- Fig. 1 A schematic configuration of an example of the proposed laser projection system.
- the enclosed figure 1 shows a schematic configuration of a laser projection system according to one example of the present invention.
- This laser projection system comprises a laser source unit with three laser diodes, a first GaN laser diode 1 emitting at a wavelength of 405 nm, a second GaAs laser diode 2 emitting at a wavelength of 630 nm and a third GaAs laser diode emitting at a wavelength of 970 nm.
- the laser beams of the three laser diodes pass intensity modulators 4 and then are combined in an appropriate beam combiner 5 to one combined laser light beam.
- This laser light beam is projected via a spatial light modulator 6, e.g. a two axis deflection scanner, on the projection screen 7.
- the intensity modulators 4 and the spatial light modulator 6 are controlled by a video control unit 8 in order to produce the desired pictures on the projection screen 7 as is known in the art.
- the projection screen 7 is covered with a luminescent layer 9, as can be seen in the amplified detail of the figure.
- the luminescent layer 9 covers the whole projection screen.
- This luminescent layer 9 contains a mixture of SrSi ⁇ NsOiEu 2"1" and Er,Yb:NaYF 4 as main components, which may be embedded in a suitable matrix material.
- the laser light from the first laser diode 1 is converted to blue light of 450-460 nm on the projection screen (down-conversion).
- the laser light emitted from the third laser diode 3 is converted to green light of a wavelength of 550 nm (up-conversion). Therefore the colors produced on the projection screen by the three laser diodes have the wavelengths of 630 nm (R), 550 nm (G) and 450-460 nm (B). This allows an RGB projection providing pictures of realistic colors to the viewer.
- Such a projection system is an excellent alternative to lamp based projectors.
- the possibility to use laser diodes as light sources results in a very compact arrangement which can be realized at low costs. Since the conversion efficiency of the proposed material for the blue conversion and the high reflectivity of this material for red (and also green) wavelengths, a very bright picture can be projected.
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK06809406.9T DK1934652T3 (en) | 2005-10-04 | 2006-09-26 | Laser projection system based on a luminescence screen |
AT06809406T ATE546757T1 (en) | 2005-10-04 | 2006-09-26 | LASER PROJECTION SYSTEM BASED ON LIGHT SCREEN |
US12/089,085 US8147067B2 (en) | 2005-10-04 | 2006-09-26 | Laser projection system based on a luminescent screen |
EP06809406A EP1934652B1 (en) | 2005-10-04 | 2006-09-26 | A laser projection system based on a luminescent screen |
KR1020087010566A KR101306023B1 (en) | 2005-10-04 | 2006-09-26 | A laser projection system based on a luminescent screen |
CN2006800368017A CN101278232B (en) | 2005-10-04 | 2006-09-26 | Laser projection system based on a luminescent screen |
ES06809406T ES2382882T3 (en) | 2005-10-04 | 2006-09-26 | Laser projection system based on a luminescent screen |
JP2008534118A JP4943442B2 (en) | 2005-10-04 | 2006-09-26 | Laser projection system based on luminous screen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05109191.6 | 2005-10-04 | ||
EP05109191 | 2005-10-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007039850A1 true WO2007039850A1 (en) | 2007-04-12 |
Family
ID=37685753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2006/053492 WO2007039850A1 (en) | 2005-10-04 | 2006-09-26 | A laser projection system based on a luminescent screen |
Country Status (11)
Country | Link |
---|---|
US (1) | US8147067B2 (en) |
EP (1) | EP1934652B1 (en) |
JP (1) | JP4943442B2 (en) |
KR (1) | KR101306023B1 (en) |
CN (1) | CN101278232B (en) |
AT (1) | ATE546757T1 (en) |
DK (1) | DK1934652T3 (en) |
ES (1) | ES2382882T3 (en) |
PT (1) | PT1934652E (en) |
TW (1) | TWI420227B (en) |
WO (1) | WO2007039850A1 (en) |
Cited By (4)
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WO2013029888A1 (en) * | 2011-08-29 | 2013-03-07 | Saint-Gobain Glass France | A device for generating a display image on a composite glass pane |
US9816027B2 (en) | 2011-04-15 | 2017-11-14 | Sekisui Chemical Co., Ltd. | Method for producing a film having luminescent particles |
US9855727B2 (en) | 2010-09-21 | 2018-01-02 | Sekisui Chemical Co., Ltd. | Glass pane as head-up display |
DE102018203246A1 (en) * | 2018-03-05 | 2019-09-05 | Osram Gmbh | LIGHTING DEVICE WITH WAVELENGTH CONVERTER AND METHOD FOR PRODUCING LIGHTING LIGHT BY WAVELENGTH CONVERSION |
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JP4144642B2 (en) * | 2006-10-30 | 2008-09-03 | ソニー株式会社 | LASER LIGHT SOURCE DEVICE AND IMAGE GENERATION DEVICE USING THE SAME |
TW201033723A (en) * | 2008-12-02 | 2010-09-16 | Alvis Technologies Corp | Laser projection system |
CN105824179B (en) * | 2009-05-29 | 2018-01-30 | 天空激光二极管有限公司 | A kind of optical projection system |
US10108079B2 (en) | 2009-05-29 | 2018-10-23 | Soraa Laser Diode, Inc. | Laser light source for a vehicle |
KR101214234B1 (en) * | 2011-02-14 | 2012-12-20 | 삼성전자주식회사 | Phosphor and method for preparing the same |
US8585929B2 (en) * | 2011-09-23 | 2013-11-19 | Epistar Corporation | Phosphor and method for preparing the same |
US9124061B2 (en) * | 2013-05-14 | 2015-09-01 | Spectralus Corporation | Projection RGB-laser light source with stabilized color balance |
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CN108803226B (en) * | 2018-05-18 | 2020-12-22 | 华南理工大学 | Fluorescent display screen containing up-conversion luminescent material and preparation method and application thereof |
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US11421843B2 (en) | 2018-12-21 | 2022-08-23 | Kyocera Sld Laser, Inc. | Fiber-delivered laser-induced dynamic light system |
US11239637B2 (en) | 2018-12-21 | 2022-02-01 | Kyocera Sld Laser, Inc. | Fiber delivered laser induced white light system |
US11884202B2 (en) | 2019-01-18 | 2024-01-30 | Kyocera Sld Laser, Inc. | Laser-based fiber-coupled white light system |
DE102019106674A1 (en) * | 2019-03-15 | 2020-09-17 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Device and method for projecting a plurality of focal points onto a surface |
CN113376935B (en) * | 2020-02-25 | 2022-08-02 | 青岛海信激光显示股份有限公司 | Laser projection device |
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2006
- 2006-09-26 CN CN2006800368017A patent/CN101278232B/en active Active
- 2006-09-26 WO PCT/IB2006/053492 patent/WO2007039850A1/en active Application Filing
- 2006-09-26 JP JP2008534118A patent/JP4943442B2/en active Active
- 2006-09-26 US US12/089,085 patent/US8147067B2/en active Active
- 2006-09-26 AT AT06809406T patent/ATE546757T1/en active
- 2006-09-26 EP EP06809406A patent/EP1934652B1/en active Active
- 2006-09-26 ES ES06809406T patent/ES2382882T3/en active Active
- 2006-09-26 KR KR1020087010566A patent/KR101306023B1/en active IP Right Grant
- 2006-09-26 DK DK06809406.9T patent/DK1934652T3/en active
- 2006-09-26 PT PT06809406T patent/PT1934652E/en unknown
- 2006-09-29 TW TW095136327A patent/TWI420227B/en active
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DE2004262A1 (en) * | 1970-01-30 | 1971-08-12 | Philips Patentverwaltung | Screen for grain-free laser beam projection |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9855727B2 (en) | 2010-09-21 | 2018-01-02 | Sekisui Chemical Co., Ltd. | Glass pane as head-up display |
US9816027B2 (en) | 2011-04-15 | 2017-11-14 | Sekisui Chemical Co., Ltd. | Method for producing a film having luminescent particles |
WO2013029888A1 (en) * | 2011-08-29 | 2013-03-07 | Saint-Gobain Glass France | A device for generating a display image on a composite glass pane |
CN103748513A (en) * | 2011-08-29 | 2014-04-23 | 法国圣戈班玻璃厂 | A device for generating a display image on a composite glass pane |
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US9922621B2 (en) | 2011-08-29 | 2018-03-20 | Sekisui Chemical Co., Ltd. | Device for generating a display image on a composite glass pane |
DE102018203246A1 (en) * | 2018-03-05 | 2019-09-05 | Osram Gmbh | LIGHTING DEVICE WITH WAVELENGTH CONVERTER AND METHOD FOR PRODUCING LIGHTING LIGHT BY WAVELENGTH CONVERSION |
Also Published As
Publication number | Publication date |
---|---|
JP4943442B2 (en) | 2012-05-30 |
CN101278232B (en) | 2010-05-26 |
US8147067B2 (en) | 2012-04-03 |
KR101306023B1 (en) | 2013-09-12 |
EP1934652A1 (en) | 2008-06-25 |
ES2382882T3 (en) | 2012-06-14 |
DK1934652T3 (en) | 2012-06-11 |
EP1934652B1 (en) | 2012-02-22 |
TWI420227B (en) | 2013-12-21 |
TW200722903A (en) | 2007-06-16 |
JP2009510536A (en) | 2009-03-12 |
CN101278232A (en) | 2008-10-01 |
PT1934652E (en) | 2012-05-21 |
US20080259431A1 (en) | 2008-10-23 |
KR20080059620A (en) | 2008-06-30 |
ATE546757T1 (en) | 2012-03-15 |
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