US20040218150A1 - Projection display device - Google Patents
Projection display device Download PDFInfo
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- US20040218150A1 US20040218150A1 US10/850,949 US85094904A US2004218150A1 US 20040218150 A1 US20040218150 A1 US 20040218150A1 US 85094904 A US85094904 A US 85094904A US 2004218150 A1 US2004218150 A1 US 2004218150A1
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- Prior art keywords
- radiation
- solvent
- absorbent
- ultra
- display device
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- Abandoned
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- 239000002250 absorbent Substances 0.000 claims abstract description 47
- 230000005855 radiation Effects 0.000 claims abstract description 38
- 238000005286 illumination Methods 0.000 claims abstract description 32
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 239000000654 additive Substances 0.000 claims abstract description 8
- 230000000996 additive effect Effects 0.000 claims abstract description 7
- 230000002745 absorbent Effects 0.000 claims description 28
- 239000000126 substance Substances 0.000 claims description 24
- 239000002904 solvent Substances 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000012965 benzophenone Substances 0.000 claims description 4
- 150000008366 benzophenones Chemical class 0.000 claims description 4
- 150000001565 benzotriazoles Chemical class 0.000 claims description 4
- 239000000298 carbocyanine Substances 0.000 claims description 4
- QWYZFXLSWMXLDM-UHFFFAOYSA-M pinacyanol iodide Chemical class [I-].C1=CC2=CC=CC=C2N(CC)C1=CC=CC1=CC=C(C=CC=C2)C2=[N+]1CC QWYZFXLSWMXLDM-UHFFFAOYSA-M 0.000 claims description 4
- 238000001816 cooling Methods 0.000 abstract description 16
- 239000000110 cooling liquid Substances 0.000 abstract description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- MOFVSTNWEDAEEK-UHFFFAOYSA-M indocyanine green Chemical compound [Na+].[O-]S(=O)(=O)CCCCN1C2=CC=C3C=CC=CC3=C2C(C)(C)C1=CC=CC=CC=CC1=[N+](CCCCS([O-])(=O)=O)C2=CC=C(C=CC=C3)C3=C2C1(C)C MOFVSTNWEDAEEK-UHFFFAOYSA-M 0.000 description 5
- 229960004657 indocyanine green Drugs 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- XNEFYCZVKIDDMS-UHFFFAOYSA-N avobenzone Chemical compound C1=CC(OC)=CC=C1C(=O)CC(=O)C1=CC=C(C(C)(C)C)C=C1 XNEFYCZVKIDDMS-UHFFFAOYSA-N 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- YBGZDTIWKVFICR-JLHYYAGUSA-N Octyl 4-methoxycinnamic acid Chemical compound CCCCC(CC)COC(=O)\C=C\C1=CC=C(OC)C=C1 YBGZDTIWKVFICR-JLHYYAGUSA-N 0.000 description 2
- WYWZRNAHINYAEF-UHFFFAOYSA-N Padimate O Chemical compound CCCCC(CC)COC(=O)C1=CC=C(N(C)C)C=C1 WYWZRNAHINYAEF-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- UVCJGUGAGLDPAA-UHFFFAOYSA-N ensulizole Chemical compound N1C2=CC(S(=O)(=O)O)=CC=C2N=C1C1=CC=CC=C1 UVCJGUGAGLDPAA-UHFFFAOYSA-N 0.000 description 2
- 229960000655 ensulizole Drugs 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229960001679 octinoxate Drugs 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
- G02B27/1046—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with transmissive spatial light modulators
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/149—Beam splitting or combining systems operating by reflection only using crossed beamsplitting surfaces, e.g. cross-dichroic cubes or X-cubes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/24—Liquid filters
-
- 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]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
-
- 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]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
- H04N9/3117—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing two or more colours simultaneously, e.g. by creating scrolling colour bands
-
- 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]
- H04N9/3141—Constructional details thereof
- H04N9/3144—Cooling systems
Abstract
The invention relates to a projection display device having an illumination system comprising a light source and an optical system for providing an illumination beam. The projection display device is further provided with an image display system for modulating the illumination beam with image information and projecting an image on a screen. In order to filter ultra-violet and infra-red radiation from the light source, a filter means is present which transmit visible light. Cooling means comprising a cooling liquid are present for cooling the filter means. In the projection display device the filter means comprises the cooling liquid which contains a radiation-absorbent additive for absorbing the ultra-violet and infra-red radiation.
Description
- The invention relates to a projection display device comprising an illumination system having a light source and an optical system for providing an illumination beam, an image display system for modulating the illumination beam with image information and for projecting an image on a screen, filter means for transmitting a first portion of radiation from the light source having a first wavelength range in the visible area to the optical system, and for absorbing a second portion of the radiation from the light source, the second portion having a second wavelength range outside the visible area, and cooling means comprising a liquid for cooling the filter means.
- Projection display devices may be used in both rear and front image projecting systems. In a rear projection system, the projection display device projects an image representing television or datagraphic information on the rear side of a diffusing transparent screen, which front side is directed to a viewing audience. In a front projecting system, the projection display device projects an image representing television or datagraphic information on the front side of a reflecting screen, which front side is directed to the viewing audience.
- Such a projection display device is known from Japanese Kokai 09-005734. The known projection display device comprises an illumination system for providing an illumination beam and an image display system for modulating an illumination beam to be supplied by the illumination system with image information and projecting an image on a screen. The illumination system comprises a light source and an optical system for forming the illumination beam. The light source may be an ultra-high pressure discharge lamp. Besides visible radiation this kind of lamp produces, also ultra-violet radiation with wavelengths mainly in the range between 250 and 425 nm and infra-red radiation with wavelengths mainly in the range between 800 and 950 nm. In order to filter the unwanted portions of the radiation from the light source, such as the ultra-violet and infra-red radiation, an ultra-violet absorbent filter and an infra-red absorbent filter may be positioned in the light path between the light source and the optical system. In order to keep the ultra-violet and infra-red absorbent filters below their maximum operating temperature, a cooling container comprising two parallel plates containing a cooling liquid is present, which container comprises a transparent portion for a wavelength range in the visible area for passing the illumination beam. This cooling means is positioned in the illumination beam and attached to the ultra-violet absorbent filter or the infra-red absorbent filter to transport the heat generated in the ultra-violet absorbent filters or the infra-red filter, respectively, to the environment of the projection display device.
- A disadvantage of the projection display device is that the thermal conductance between the ultra-violet absorbent filter and the container is limited and the operating temperature of the filters can be exceeded, which affects the cut-off wavelengths and the lifetime of the filters.
- It is an object of the invention to provide a projection display device having an extended lifetime. This object can be achieved by the projection display device in accordance with the invention, and is characterized in that the filter means comprises the liquid which contains a radiation-absorbent additive for absorbing the second range of wavelengths. This invention is based on the recognition that the heat generated by the absorption of the radiation can be directly transported to the environment by convection in the liquid whereas in the conventional system the heat transport is limited by conduction in the ultra-violet or infra-red absorbent materials. In the new projection display device, heat transport via convection is more efficient so that the filter means can be operated at a lower operating temperature, which extends the lifetime.
- A further advantage is that the stability of the cut-off wavelength of the filter means is improved because of a temperature dependency of the cut-off wavelength. A more constant temperature provides a more stable cut-off wavelength of the filter means. Furthermore, the improved cooling may allow a more compact design of the projection display device.
- A particularly advantageous embodiment of the projection display according to the invention is characterized in that the liquid comprises a solvent and the radiation-absorbent additive is a substance which is soluble in the solvent for absorbing radiation having the second range of wavelengths. The second range of wavelengths may be an ultra-violet range between 250 and 425 nm or an infra-red range between 800 and 950 nm.
- A further embodiment of the projection display device is characterized in that the solvent is water and the radiation-absorbent substance is one of the group of benzophenonephosphates and benzotriazolephosphates. Also benzophenonesulphates or benzotriazolesulphates can be used as radiation-absorbent substances, both of which are also soluble in water. These radiation-absorbent substances mainly absorb ultra-violet radiation in a range between 350 and 425 nm.
- A further embodiment of the projection display device is characterized in that the solvent is an organic liquid and the radiation-absorbent additive is one of the group of benzophenones and benzotriazoles. This radiation-absorbent substance also absorbs ultra-violet radiation in a range between 250 and 425 nm.
- A further embodiment of the projection display device is characterized in that the solvent is water and the radiation-absorbent substance is one of the group of carbo-cyanines. This radiation-absorbent substance absorbs mainly infra-red radiation in a wavelength range between 800 and 950 nm.
- These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
- In the drawings:
- FIG. 1 shows an example of a projection display device having a filter means,
- FIG. 2 shows a diagram of the electromagnetic radiation spectrum of an UHP lamp,
- FIG. 3 shows an example of a container containing the filter liquid,
- FIG. 4 shows a diagram of the ultra-violet absorption-versus-wavelength of a solution of Eusolex 9020 in an organic solvent, and
- FIG. 5 shows a diagram of the infra-red absorption-versus-wavelength of a solution of indocyanine green in water.
- FIG. 1 shows an example of a first image projection device1 comprising an
illumination system 3 for supplying an illumination beam and a conventionalimage display system 5 for modulating the illumination beam. Theillumination system 3 comprises alight source 7, areflector 9, an ultravioletabsorbent filter 11, acondenser lens 13 and apolarisation converter 15. Thereflector 9 ensures that the greater part of the light emitted by thelight source 7 in a direction away from the illumination system as yet reaches theimage display system 5. The illumination beam generated by theillumination system 3 is incident on theimage display system 5. Theimage display system 5 comprises dichroic mirrors, 17, 21,mirrors dichroic cross 33, andtransmissive display panels analyser 35 and aprojection lens 37. - In operation, white light from the
light source 7 and thereflector 9 is coupled in thedisplay system 5 via the ultra-violetabsorbent filter 11, thecondenser plates 13 and thepolarisation converting system 15. Thecondenser plates 13 provide a homogeneous illumination beam. Thepolarisation conversion system 15 provides an illumination beam with a single linear polarisation direction from an incoming non-polarised illumination beam. The ultra-violet absorbent filter absorbs radiation in the range from 250 to 425 nm in the illumination beam. - Furthermore, an infra-red
absorbent filter 12 may be present between thelight source 7 and thecondenser plates 13 for absorbing radiation from the light source in the range between 800 and 950 nm. In thedisplay system 5, the firstdichroic mirror 17 separates the red sub-beam from the white illumination beam. Themirror 19 directs the red sub-beam towards a first liquidcrystal display panel 31. The firstdichroic mirror 17 directs the blue and green sub-beams to a seconddichroic mirror 21. The seconddichroic mirror 21 directs the green portion to the second liquidcrystal display panel 29 and the blue portion is transmitted to the third liquidcrystal display panel 31 via themirrors crystal display panels dichroic cross 33 combines the red, green and blue sub-beams in a single modulated light beam and directs the modulated light beam via ananalyser 35 to the projection lens. Theprojection lens 37 images the modulated light beam on a projection screen (not shown). - The
light source 7 may be an ultra-high pressure discharge lamp such as UHP-100 as supplied by Philips Electronics. Besides radiation in the visible wavelength range, this UHP lamp produces also radiation in the ultra-violet part and the infra-red part of the electromagnetic spectrum. - FIG. 2 shows a diagram of the spectrum radiated by a 100 watt UHP lamp.
- The diagram shows three lines, a first line, marked0-0-0-0, indicates the output of the lamp in watts/nm for the burner or central portion of the lamp where the actual discharge takes place. A second line, marked x-x-x-x- indicates the output of the UHP lamp, measured in front of the reflector and a third line marked ------ indicates the output of the lamp measured behind the reflector.
- The ultra-violet portion of the light from the
UHP lamp 7 may damage thepolarisation conversion system 15, the liquidcrystal display panels analyzer 35. Therefore, theultra-violet filter 11 is positioned between theUHP lamp 7 and thepolarisation conversion system 15. The ultra-violetabsorbent filter 11 absorbs radiation in the range between 250 and 425 nm from the radiation of the UHP lamp. - The infra-red portion of the radiation of the UHP lamp heats the
polarisation conversion system 15 and the liquidcrystal display panels polarisation conversion system 15 and the liquid crystal displays 27,29,31 may require additional cooling. In order to prevent unnecessary heating of thepolarisation conversion system 15 or the liquidcrystal display panels absorbent filter 12 is placed between the UHP-lamp 5 and thecondenser plates 13. The infra-redabsorbent filter 12 absorbs radiation in the range from 800 to 950 nm from theUHP lamp 5 and reduces the heating of thepolarisation conversion system 15 and the liquidcrystal display panels absorbent filter 11 as well as the infraredabsorbent filter 12, these filters can be attached to a container with a cooling liquid. A portion of the container and the cooling liquid is transparent for transmitting a portion of the radiation from theUHP lamp 7 between 425 and 800 nm. The coolingcontainer 39 may be provided with cooling fins (not shown) to transport heat from the coolingcontainer 39 to the environment. - In order to further improve the cooling of the ultra-violet and infra-
red filters condenser plates 13 and comprising a liquid transparent portion for radiation in the visible range between 425 and 800 nm, wherein the liquid comprises an ultra-violet absorbent substance. The infra-red filter 12 also comprises a container having a transparent portion for transmitting the radiation in the visible range between 425 and 800 nm to thecondenser plates 13, wherein the liquid comprises a liquid transparent to radiation in the visible range between 425 and 800 nm, wherein the liquid comprises an infra-red absorbent substance. - FIG. 3 is a cross-section of an ultra-violet
absorbent filter 11. The ultra-violetabsorbent filter 11 comprises thecontainer 39 having arectangular frame 41 provided with twotransparent surfaces container 39 contains a solvent 47 and an ultra-violet absorbing substance which is soluble in the solvent. Furthermore, coolingfins 49 can be connected to theframe 41. The solvent may be water or an organic solvent. Examples of water-soluble substances are: benzophenonesphosphates, benzotriazolephosphates, benzophenonessulphates, benzotriazolesulphates. - A practical applicable substance may be Eusolex 232 (phenylbenzimidazole sulfonic acid) which is a water-soluble UV-B filter, and can be obtained from Merck.
- Examples of oil-soluble substances are benzophenones and benzotriazoles.
- A practical applicable substance may be an oil-soluble UV-A filter, for example, Eusolex 9020 (butyl metoxydibenzoylmethane), Eusolex 6007 (Octyldimethyl PABA) or an oil-soluble UV-B filter Eusolex 2292 (Octyl Methoxycinnamate). All of these substance can be obtained from Merck.
- FIG. 4 shows a diagram of the absorption efficacy-versus-wavelength characteristic of Eusolex 9020 solved in oil. The characteristics show a high efficacy for the UV-B part of the spectrum between 300 and 425 nm.
- The construction of the infra-red
absorbent filter 12 is similar to the construction of the ultra-violetabsorbent filter 11 as shown in FIG. 3. Thecontainer 39 contains a solvent and an infra-red absorbing substance which is soluble in the solvent. The solvent may be water or organic solvents. Water and other solvents like methanol, ethanol, glycol absorb radiation with a wavelength above 1000 nm. In order to absorb radiation with a wavelength in the range between 800 and 1000 nm, infra-red absorbing additives may be added, like carbo-cyanines. For example, IR1000, IR27, which can be ordered from Sigma-Aldrich, and indocyanine green (ICG). - FIG. 5. shows the absorbing characteristic of indocyanine green. ICG is a tricarbocyanine dye with a peak absorption at 800 nm and has little absorption in the visible range of the electromagnetic spectrum.
- In operation, the dissipated heat will now be directly generated in the liquid47 and is transported to the cooling
fins 49 mainly by convection in the liquid 47 instead of conduction in the radiation absorbent material as in conventional ultra-violet and infra-red absorbent filters. This allows an efficient cooling of the ultra-violet and infra-red absorbent filters. - The invention is not limited to the above described projection system but may also be applied in scrolling color projection systems with a reflective display panel, for example, a liquid crystal on silicon (LCOS) panel.
Claims (16)
1. A projection display device including an illumination system having a light source and optical system that provide an illumination beam that includes visible light and nonvisible light including at least one of infrared and ultraviolet radiation, comprising:
an image display system that modulates the illumination beam with image information and projects an image onto a screen, and
a filter element that absorbs the nonvisible light and transmits the visible light to the optical system,
the filter element including a liquid that contains a radiation-absorbent additive that absorbs the nonvisible light.
2. The device of claim 1 , wherein the radiation-absorbent additive is soluble in a solvent comprised by the liquid.
3. The device of claim 2 , wherein said nonvisible light includes ultraviolet radiation of wavelengths between 250 and 425 nm.
4. The device of claim 3 , wherein the solvent is water and the radiation-absorbent substance is selected from the group consisting of benzophenonephosphates and benzotriazolephosphates.
5. The device of claim 3 , wherein the solvent is water and the radiation-absorbent substance is selected from the group consisting of benzophenonesulphates and benzotriazolesulphates.
6. The device of claim 3 , wherein the solvent is organic and the radiation absorbent substance is selected from the group consisting of benzophenones and benzotriazoles.
7. The device of claim 2 , wherein said nonvisible light includes infrared radiation of wavelengths between 800 and 950 nm.
8. The device of claim 7 , wherein the solvent is water and the radiation-absorbent substance is selected from the group consisting of carbocyanines.
9. A projection display device including an illumination system having a light source and optical system that provide an illumination beam that includes visible light and nonvisible light including at least one of infrared and ultraviolet radiation, comprising:
an image display system that modulates the illumination beam with image information and projects an image onto a screen, and
a filter element including a liquid that absorbs the nonvisible light and transmits the visible light to the optical system.
10. The device of claim 9 , wherein the liquid contains a radiation-absorbent substance that absorbs the nonvisible light and is soluble in a solvent comprised by the liquid.
11. The device of claim 10 , wherein said nonvisible light includes ultraviolet radiation of wavelengths between 250 and 425 nm.
12. The device of claim 11 , wherein the solvent is water and the radiation-absorbent substance is selected from the group consisting of benzophenonephosphates and benzotriazolephosphates.
13. The device of claim 11 , wherein the solvent is water and the radiation-absorbent substance is selected from the group consisting of benzophenonesulphates and benzotriazolesulphates.
14. The device of claim 11 , wherein the solvent is organic and the radiation absorbent additive is selected from the group consisting of benzophenones and benzotriazoles.
15. The device of claim 10 , wherein said nonvisible light includes infrared radiation of wavelengths between 800 and 950 nm.
16. The device of claim 15 , wherein the solvent is water and the radiation-absorbent substance is selected from the group consisting of carbocyanines.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/850,949 US20040218150A1 (en) | 2001-09-11 | 2004-05-21 | Projection display device |
Applications Claiming Priority (4)
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---|---|---|---|
EP01203421 | 2001-09-11 | ||
EP01203421.1 | 2001-09-11 | ||
US10/236,183 US6796659B2 (en) | 2001-09-11 | 2002-09-06 | Projection display device |
US10/850,949 US20040218150A1 (en) | 2001-09-11 | 2004-05-21 | Projection display device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/236,183 Continuation US6796659B2 (en) | 2001-09-11 | 2002-09-06 | Projection display device |
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US20040218150A1 true US20040218150A1 (en) | 2004-11-04 |
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ID=8180911
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US10/236,183 Expired - Fee Related US6796659B2 (en) | 2001-09-11 | 2002-09-06 | Projection display device |
US10/850,949 Abandoned US20040218150A1 (en) | 2001-09-11 | 2004-05-21 | Projection display device |
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US10/236,183 Expired - Fee Related US6796659B2 (en) | 2001-09-11 | 2002-09-06 | Projection display device |
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US (2) | US6796659B2 (en) |
EP (1) | EP1430728A1 (en) |
JP (1) | JP2005502923A (en) |
KR (1) | KR20040045434A (en) |
CN (1) | CN1554197A (en) |
TW (1) | TW579437B (en) |
WO (1) | WO2003024120A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006131012A1 (en) * | 2005-06-07 | 2006-12-14 | Oc Oerlikon Balzers Ag | Multiple bandpass filter for projection arrangements |
US20070058137A1 (en) * | 2005-09-15 | 2007-03-15 | Ching-An Yang | Projection display apparatus and optical filter |
US20070079959A1 (en) * | 2005-10-07 | 2007-04-12 | Seiko Epson Corporation | Cooling device, projector, and cooling method |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003114480A (en) * | 2001-10-04 | 2003-04-18 | Seiko Epson Corp | Image processing meeting change of optical system of projector |
US7119779B2 (en) * | 2003-03-25 | 2006-10-10 | Intel Corporation | Display device refresh |
KR100565075B1 (en) | 2004-07-27 | 2006-03-30 | 삼성전자주식회사 | Illuminating unit and projection type image display apparatus employing the same |
WO2007040028A1 (en) * | 2005-10-04 | 2007-04-12 | Sharp Kabushiki Kaisha | Liquid crystal display unit and portable electronic apparatus provided with it |
WO2012071669A1 (en) * | 2010-11-29 | 2012-06-07 | Genesis Health Light Corporation | Liquid containing filter and hand held heat light |
CN109884743A (en) * | 2019-04-09 | 2019-06-14 | 北京欧曼金字塔医学科技有限公司 | A kind of potent heat radiating type optical filter box |
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WO2006131012A1 (en) * | 2005-06-07 | 2006-12-14 | Oc Oerlikon Balzers Ag | Multiple bandpass filter for projection arrangements |
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Also Published As
Publication number | Publication date |
---|---|
CN1554197A (en) | 2004-12-08 |
EP1430728A1 (en) | 2004-06-23 |
WO2003024120A1 (en) | 2003-03-20 |
KR20040045434A (en) | 2004-06-01 |
JP2005502923A (en) | 2005-01-27 |
TW579437B (en) | 2004-03-11 |
US20030048424A1 (en) | 2003-03-13 |
US6796659B2 (en) | 2004-09-28 |
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Legal Events
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