WO2005036260A1 - フレネルレンズ及び透過型スクリーン、並びにこれらを用いた背面投写型ディスプレイ装置 - Google Patents
フレネルレンズ及び透過型スクリーン、並びにこれらを用いた背面投写型ディスプレイ装置 Download PDFInfo
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- WO2005036260A1 WO2005036260A1 PCT/JP2004/015136 JP2004015136W WO2005036260A1 WO 2005036260 A1 WO2005036260 A1 WO 2005036260A1 JP 2004015136 W JP2004015136 W JP 2004015136W WO 2005036260 A1 WO2005036260 A1 WO 2005036260A1
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- Prior art keywords
- fresnel lens
- fresnel
- lens sheet
- display device
- rear projection
- Prior art date
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- 230000003287 optical effect Effects 0.000 claims abstract description 46
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
-
- 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
- G03B21/62—Translucent screens
- G03B21/625—Lenticular translucent screens
-
- 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
Definitions
- the present invention relates to a Fresnel lens sheet and a transmissive screen used for a transmissive screen, and a rear projection display device using the same.
- a rear projection screen has been generally used as one of the projection screens.
- an image light projected from a projector having a light source, an image display, and a projection lens is generally provided by a Fresnel lens sheet having a Fresnel lens and a lenticular lens sheet having a lenticular lens. Through the reach of the observer.
- a screen for a production television is generally required to have an optical function that diffuses widely in the horizontal direction and narrower in the vertical direction than in the horizontal direction.
- a light diffusion plate or a light diffusion sheet in which a light diffusion agent is dispersed is often used for vertical diffusion.
- CRTs Cathode Ray Tubes
- liquid crystal projectors are often used for projectors
- DMD digital mirror devices
- the depth of the rear projection display device is different from that of other current systems.
- thinner devices which are larger than liquid crystal display televisions and plasma display televisions.
- a prism structure is provided on the back of the Fresnel lens sheet on which the Fresnel lens is formed, and the reflected light is reflected by the main mirror installed at a smaller interval than usual, and the light is incident on the Fresnel lens again, and the observer side
- the entire rear projection type display device is made thinner by a method of guiding light to the light source (for example, see Patent Documents 1 and 2 below).
- This method can maintain the light use efficiency by skillfully utilizing the polarization and total reflection of light. However, since the number of screens increases, stray light is generated, and However, it is disadvantageous in terms of cost.
- Patent Document 1 JP-A-8-336091
- Patent Document 2 JP-A-8-339033
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-57963
- Patent Document 4 JP-A-9-281904
- Patent Document 5 JP-A-11-160790
- Patent Document 6 JP 2001-108937 A
- Patent Document 7 Japanese Patent Application Laid-Open No. 2001-337206
- Patent Document 8 JP-A-2002-90888
- Patent Document 9 JP-A-2003-114481
- Patent Document 10 Japanese Patent Application Laid-Open No. 2003-149744
- the current rear-projection display device is improved in its performance including optical performance, and at the same time, is thinner and has a higher performance with a structure as simple as possible without adding complicated structures and mechanisms. Therefore, there has been a demand for realization of low cost, and as described above, particularly, thinning has been delayed.
- main mirror which is indispensable for reflecting the projection light from the projector to the screen and projecting it on the structure of the rear projection display device.
- the force depending on the position of the projector This main mirror needs to be tilted, and since it can be up to about 45 degrees, the space for tilting the rear mirror is the same. This is because the thickness of the ray device increases.
- the present inventor has reviewed both the mold making method and the lens molding method, and has obtained a Fresnel lens sheet having a large Fresnel angle.
- the Fresnel lens sheet of the present invention is a Fresnel lens sheet in which a lens pattern having a Fresnel surface serving as a light transmitting surface and a rise surface serving as a light non-transmitting surface is formed concentrically.
- the optical axis of the Fresnel lens which is the center of the lens pattern, is arranged outside the Fresnel lens sheet, and the angle of inclination of the Fresnel surface with respect to a plane perpendicular to the optical axis is equal to the optical axis force.
- the Fresnel lens sheet has a region where the angle of inclination of the Fresnel surface is 77 degrees or more.
- the incident surface side of the Fresnel lens In the Fresnel lens sheet of the present invention, the incident surface side of the Fresnel lens and
- an antistatic layer is provided at least on the incident surface side of the Fresnel lens.
- the Fresnel lens sheet of the present invention is constituted by laminating two or more layers of materials having different hardness and brittleness.
- the transmission screen of the present invention is a transmission screen having a Fresnel lens sheet; and a light diffusing plate;
- a lens pattern having a Fresnel surface serving as a light transmitting surface and a rise surface serving as a light non-transmitting surface is formed concentrically.
- the optical axis force of the Fresnel lens which is the center, is disposed outside the Fresnel lens sheet, and the inclination angle of the Fresnel surface with respect to a plane perpendicular to the optical axis gradually increases from the optical axis to the periphery, and the Fresnel
- the lens sheet has a region where the inclination angle of the Fresnel surface is 77 degrees or more.
- the light diffusing plate includes a frosted glass, a diffusing plate containing a filler or light diffusing particles, and a plurality of convex cylindrical lenses arranged in one predetermined direction.
- a lenticular sheet, a plurality of convex cylindrical lenses are arranged on the same plane so as to intersect in two predetermined directions, and a cross lenticular sheet, a lens sheet having a prism array, and a unit lens are two-dimensionally arranged. It is desirable that the lens sheet with the arrayed microphone aperture lens structure be misaligned.
- a low refractive index layer is provided on the incident surface side and the Z or emission surface side of the Fresnel lens.
- an antistatic layer is provided at least on the incident surface side of the Fresnel lens sheet.
- the Fresnel lens sheet is formed by laminating two or more layers of materials having different hardness and brittleness.
- the rear projection display device of the present invention includes: a transmission screen having a Fresnel lens sheet and a light diffusing plate; a projector capable of projecting an image on the transmission screen; A rear surface projection type display device comprising: a reflection mirror provided between the lens pattern; and a lens pattern having a Fresnel surface serving as a light transmitting surface and a rise surface serving as a light non-transmitting surface concentrically on the Fresnel lens sheet.
- the optical axis of the Fresnel lens which is the center of the lens pattern, is arranged outside the Fresnel lens sheet, and the reflecting mirror is installed at a substantially intermediate position between the projector and the transmission screen. ing.
- an installation angle of the reflection mirror with respect to the transmission screen is 5 degrees or more.
- the projector is arranged so that an image is projected obliquely onto the translucent screen.
- the light diffusing plate includes a diffusing plate containing frosted glass, a filler or light diffusing particles, and a plurality of convex cylindrical lenses arranged in one predetermined direction.
- a lenticular sheet, a plurality of convex cylindrical lenses are arranged on the same surface so as to intersect in two predetermined directions, and a cross lenticular sheet, a lens sheet having a prism array, and a unit lens are two-dimensional. It is desirable that the lens sheet with the microlens structure arranged in a row be misaligned! /.
- the reflecting surface of the reflecting mirror is a non-spherical surface and a Z or asymmetric curved surface.
- a low refractive index layer is provided on the incident surface side and the Z or emission surface side of the Fresnel lens.
- an antistatic layer is provided on at least the incident surface side of the Fresnel lens sheet.
- the Fresnel lens sheet is formed by laminating two or more layers of materials having different hardness and brittleness.
- the optical axis of the Fresnel lens which is the center of the Fresnel lens pattern formed concentrically, is located outside the Fresnel lens sheet, and is perpendicular to the optical axis of the Fresnel lens.
- the angle of the inclination of the Fresnel surface with respect to the plane intersecting gradually increases from the optical axis of the Fresnel lens toward the periphery, and the Fresnel lens sheet has an area where the inclination angle of the Fresnel surface is 77 degrees or more.
- the projection distance between the Fresnel lens sheet and the projector that is, the distance between the flat mirror, which is the main mirror, is reduced, and the space under the screen of the rear projection display device can be used for projector placement.
- FIG. 1 is a configuration diagram showing a configuration example of a rear projection display device using a transmission screen of the present invention.
- FIG. 2 is a cross-sectional view schematically showing a cross section of a part of the Fresnel lens sheet of the present invention.
- FIG. 3 is a partially enlarged sectional view of a lens surface of the Fresnel lens sheet of the present invention.
- FIG. 4 is a plan view showing an outline of a Fresnel lens sheet of the present invention.
- FIG. 5 is a configuration diagram of a rear projection display device of the present invention.
- FIG. 6 is a cross-sectional view showing angles of incident light rays and outgoing light rays to the Fresnel lens specified in a trial calculation of the depth length of the rear projection display device.
- FIG. 7 is a graph showing the relationship between the Fresnel angle and the depth of a 50-inch rear projection display device when the refractive index of the Fresnel lens sheet is 1.53.
- FIG. 8 is a graph showing the relationship between the Fresnel angle and the depth of a 50-inch back-projection display device when the refractive index of the Fresnel lens sheet is 1.55.
- FIG. 9 is a graph showing the relationship between the Fresnel angle and the depth of a 60-inch back-projection display device when the refractive index of the Fresnel lens sheet is 1.53.
- FIG. 10 is a graph showing the relationship between the Fresnel angle and the depth of a 60-inch rear projection display device when the refractive index of the Fresnel lens sheet is 1.55.
- FIG. 11 is a graph showing the relationship between the Fresnel angle and the depth of a 70-inch rear projection display device when the refractive index of the Fresnel lens sheet is 1.53.
- FIG. 12 is a graph showing the relationship between the Fresnel angle and the depth of a 70-inch rear projection display device when the refractive index of the Fresnel lens sheet is 1.55.
- FIG. 1 shows a configuration example of a rear projection display device 10 using the transmission screen 1 of the present invention.
- the rear projection display device 10 includes a transmissive screen 1 whose optical system mainly includes a Fresnel lens sheet 2 and a light diffusion plate 3, a projector 5 that projects an image on the transmissive screen 1, and a transmissive screen 1 And a projector 5 arranged at a substantially intermediate position between the projector 5 and an image light projected from the projector 5 and directed to the transmission screen 1 by the plane reflector 4 (main mirror). The light is reflected and projected on a transmission screen, so that an observer located at the opposite side can see the image.
- the projector 5 is arranged so that an image is projected obliquely onto the transmissive screen 1.
- the image is transformed into a trapezoid on the transmissive screen 1 and projected.
- the projector 5 is provided with a correction function to prevent the image from being transformed into a trapezoid.
- the projector 5 ′ and the light rays indicated by the dotted lines in the figure show an arrangement example in the case where an image is directly projected on the transmissive screen 1 without using the flat reflecting mirror 4.
- FIG. 2 is a diagram schematically showing a cross section of a part of the Fresnel lens sheet 2.
- the Fresnel lens sheet 2 is composed of a glass substrate 2a such as a blue plate or a float, and a Fresnel lens 2b made of metharyl styrene (MS) resin, polycarbonate (PC), and resin formed on the glass substrate 2a. It has a two-layer structure.
- the glass substrate 2a and the Fresnel lens 2b are made of different materials.
- the glass substrate 2a plays the role of the rigidity of the Fresnel lens sheet 2 and the Fresnel lens 2b plays the role of preventing the glass substrate 2a from scattering when the screen is broken.
- the Fresnel lens 2b has a concentric lens pattern in which a Fresnel surface 2c serving as a light transmitting surface and a rise surface 2d serving as a light non-transmitting surface are formed alternately.
- the angle in the concentric prism shown here (the angle of the Fresnel surface with respect to a plane perpendicular to the optical axis, that is, the Fresnel angle). It is an important factor in making decisions.
- the Fresnel lens 2b having a large Fresnel angle can be manufactured by reviewing the processing conditions of the Fresnel lens, and the transmission type screen 1 is provided when the Fresnel angle is 77 ° or more.
- the projection image light can be incident at a very shallow angle. In other words, the projection image light at a shallow angle due to the offset arrangement of the optical axis of the Fresnel lens sheet 2 can enter the Fresnel surface 2c without being incident on the rise surface 2d. Images can be obtained
- the following table is a table showing Fresnel angles 6 of Fresnel lenses in the Fresnel lens sheet 2 of the present invention.
- the orbicular zone position indicates the radius from the optical center of the Fresnel lens sheet 2 as a percentage, and indicates the Fresnel angle at that position.
- the outermost circumference has a shape reaching 80 degrees.
- FIG. 3 is a sectional view of the lens surface of the Fresnel lens sheet of the present invention.
- the right side is the center side of the Fresnel lens sheet, and the left side is the outer side. Projected image light enters from the lower right side of FIG. 3, and refracts the incident light on the Fresnel surface (the surface on the left side of the prism in the figure).
- the light diffusing plate 3 is formed by mixing a frosted glass, a filler, light diffusing fine particles and the like into a transparent synthetic resin, and a semi-cylindrical convex cylindrical lens in a predetermined direction with a predetermined pitch.
- Such a lens sheet has a unit lens shape that can be used for the transmission screen, and can be appropriately selected according to the use of the transmission screen.
- the depth of the rear projection display device 10 can be reduced, and the field of view can be expanded in the vertical direction of the screen.
- the depth of the rear projection display device 10 can be reduced, and the field of view can be expanded in all directions.
- the lens sheet functions as a lens or a prism by being made of an optical transparent resin.
- an optical transparent resin a transparent synthetic resin sheet that is easy to apply various molding technologies for optical production is desired.
- the transparent synthetic resin include acrylic resin such as polymethyl methacrylate, polycarbonate resin, acrylic-styrene copolymer resin, styrene resin, and polychlorinated butyl resin.
- the light diffusing fine particles may be made of an organic polymer such as acrylic resin, polyurethane resin, or polyamide resin, or an inorganic compound such as silica, which is preferably spherical, particularly spherical. Monkey
- the Fresnel angle As shown in FIG. 4, by arranging the optical axis of the Fresnel lens (ie, the center 7 of the concentric structure) outside the image projection area on the transmissive screen 1 used for the rear projection display device 10, the Fresnel angle When the angle approaches 0 degrees, it becomes difficult to process the Fresnel lens. By setting the center of the concentric structure outside the image projection area, that part is not used for the transmissive screen. Since the precision of the Fresnel lens processing is not required, the processing becomes easy as a result that there is no need to be aware of unevenness in the processing of the Fresnel lens.
- the projector can be arranged at the lower part of the screen, so that the arrangement can be made very effective for reducing the thickness of the rear projection display device.
- the Fresnel lens sheet 2 may be provided with a low refractive index layer on the incident surface side of the Fresnel lens 2b.
- the low refractive index layer is provided on the incident surface of the substrate 2a. Will be.
- the low refractive index layer may be provided on the exit surface side of the Fresnel lens 2b, or may be provided on both the entrance surface side and the exit surface side.
- the Fresnel lens sheet 2 may be provided with an antistatic layer on the incident surface side of the Fresnel lens 2b.
- the antistatic layer is provided on the incident surface of the substrate 2a. By providing the antistatic layer, dust inside the display device can be prevented and the image quality can be improved.
- the antistatic layer may be provided on both the incident surface side and the emission surface side of the Fresnel lens 2b.
- the Fresnel lens sheet 2 has a two-layer structure of a glass substrate 2a such as a blue plate or a float, and a Fresnel lens 2b made of metharyl styrene (MS) resin / polycarbonate (PC) resin.
- the Fresnel lens sheet may be formed by laminating three or more layers of different materials having different hardness and brittleness.
- a reflecting mirror whose reflecting surface is not a flat surface but a non-spherical curved surface may be used instead of the plane reflecting mirror 4, a reflecting mirror whose reflecting surface is not a flat surface but a non-spherical curved surface may be used.
- the image becomes trapezoidal without using the correction function of the projector 5. Can be corrected so as not to be deformed.
- the projection angle of the projector 5 with respect to the transmissive screen 5 can be made smaller (smaller) than before.
- the thickness of the display device can be reduced.
- the reflecting mirror may be aspherical and symmetrical, or may be aspherical and asymmetrical.
- FIG. 5 shows another configuration example of the rear projection display device 20 using the transmission screen 1 of the present invention.
- the rear projection display device 10 includes a transmission screen 11 whose optical system mainly includes a Fresnel lens sheet 12 and a light diffusion plate 13, a projector 15 that projects an image on the transmission screen 11, a transmission screen 11 and a projector 15
- FIG. 3 is a conceptual diagram showing a case where the flat reflecting plate 14 is configured with a plane reflecting mirror 14 arranged at a substantially middle position between the flat reflecting plate 14 and the flat reflecting plate 14 at an inclined angle.
- the projector 15 ′ and the light rays indicated by the dotted lines in the figure show the arrangement in the case where the image is directly projected on the transmission screen 11 without installing the plane reflecting mirror 14.
- the angle 16 of the flat reflector 14 is set to 5 degrees or more with respect to the transmissive screen 11, so that the angle between the optical axis of the projector 5 and the projection distance of the projector 5 is changed.
- the distance from the optical axis of the Fresnel lens 2 is increased.
- the gap is widened by 18.7 mm.
- the above-mentioned concentric circular structure of the Fresnel lens is displaced from the screen so that the center of the optical axis is in the region on the screen and the transmissive screen is composed of a Fresnel lens sheet having a Fresnel angle of 77 degrees or more.
- the installation angle 16 of the plane reflector 14 is set to 5 degrees or more, the image light projected from the projector 15 returns to the vicinity of the projector 15 due to reflection of the Fresnel lens 12 and the diffuser 13 by the image light.
- the problem of stray light on the transmissive screen 1 is much better than that of a higher quality image that can be seen through the transmissive screen 11.
- the present invention relates to a Fresnel lens pattern, which is the center of a Fresnel lens pattern formed concentrically. If the optical axis of the lens lens is located outside the Fresnel lens sheet and there is a region where the Fresnel angle of the Fresnel surface of the lens pattern that gradually increases from the optical axis of the Fresnel lens toward the periphery is 77 degrees or more to the optical axis As a result, the projection distance between the Fresnel lens sheet and the projector, that is, the distance between the main mirror and the flat reflecting mirror can be shortened, and the depth of the rear projection display device can be reduced. .
- the image projected on the screen can be brought closer to the projector. Since it is possible to prevent stray light from being generated on the screen due to the returning light, it is possible to obtain a rear projection display device capable of displaying a high quality projected image.
- the optical center was located at a position protruding from the lower edge of the Fresnel lens sheet 2 by 10% of the vertical length of the transmission screen 1.
- FIG. 7 shows a rear projection type screen in which the diagonal length of the transmission screen 1 is 50 inches, the refractive index n of the Fresnel lens sheet 2 is 1.53, and the Fresnel angle ⁇ is changed.
- the result of trial calculation of how the depth length W of the display device 10 changes is shown.
- the length h of the transmissive screen 1 is determined based on the aspect ratio (known) of the transmissive screen 1.
- FIG. 8 shows the results of a similar calculation performed with the refractive index n of the Fresnel lens sheet 2 set to 1.55.
- FIG. 9 shows a rear projection type screen in which the diagonal length of the transmission screen 1 is 60 inches, the refractive index n of the Fresnel lens sheet 2 is 1.53, and the Fresnel angle ⁇ is changed.
- the result of trial calculation of how the depth length W of the display device 10 changes is shown.
- FIG. 10 shows the result of a similar calculation performed with the refractive index n of the Fresnel lens sheet 2 set to 1.55.
- Fig. 11 shows a rear projection display in which the diagonal length of the transmission screen 1 is 70 inches, the refractive index n of the Fresnel lens sheet 2 is 1.53, and the Fresnel angle ⁇ is changed. The calculation result of how the depth length W of the device 10 changes is shown.
- Figure 12 Shows the result of the same calculation performed with the refractive index n of the Fresnel lens sheet 2 set to 1.55.
- the depth length W shows only a linear function change, but when the Fresnel angle ⁇ is 77 degrees or more, the depth length W becomes a quadratic function. It can be seen that it changes dramatically and becomes extremely short.
- a lens pattern having a Fresnel surface serving as a light transmitting surface and a rise surface serving as a light non-transmitting surface is formed concentrically, and the optical axis of the Fresnel lens which is the center of the lens pattern has the Fresnel lens.
- the present invention relates to a rear projection display device, wherein the reflection mirror is installed at a substantially intermediate position between a projector and the transmission screen.
- the rear projection type display device of the present invention it is possible to prevent stray light from being generated on the screen due to return light of the projected image on the screen to the vicinity of the projector, and It is possible to obtain a rear projection display device that can display a high-quality projection image without adding a man-hour or a man-hour, and without deteriorating the advantage of thinning.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Projection Apparatus (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/575,250 US20070115548A1 (en) | 2003-10-14 | 2004-10-14 | Fresnel lens and translucent type screen, and rear projection type display apparatus using the same |
JP2005514648A JP4556872B2 (ja) | 2003-10-14 | 2004-10-14 | フレネルレンズ及び透過型スクリーンを用いた背面投写型ディスプレイ装置 |
EP04792368A EP1674927A1 (en) | 2003-10-14 | 2004-10-14 | Fresnel lens, transmission screen, and rear projection-type display device using the lens and the screen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-353272 | 2003-10-14 | ||
JP2003353272 | 2003-10-14 |
Publications (1)
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WO2005036260A1 true WO2005036260A1 (ja) | 2005-04-21 |
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PCT/JP2004/015136 WO2005036260A1 (ja) | 2003-10-14 | 2004-10-14 | フレネルレンズ及び透過型スクリーン、並びにこれらを用いた背面投写型ディスプレイ装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20070115548A1 (ja) |
EP (1) | EP1674927A1 (ja) |
JP (1) | JP4556872B2 (ja) |
KR (1) | KR20060090701A (ja) |
CN (1) | CN1867864A (ja) |
TW (1) | TWI356969B (ja) |
WO (1) | WO2005036260A1 (ja) |
Families Citing this family (11)
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JP2008180921A (ja) * | 2007-01-25 | 2008-08-07 | Mitsubishi Electric Corp | 投写型表示装置 |
JP2013171246A (ja) * | 2012-02-22 | 2013-09-02 | Ricoh Co Ltd | 超短焦点プロジェクター用リアスクリーン |
CN103489374A (zh) * | 2013-08-13 | 2014-01-01 | 江苏清投视讯科技有限公司 | 一种多屏幕拼接的无缝显示屏 |
US9013790B1 (en) * | 2014-06-12 | 2015-04-21 | Google Inc. | High contrast rear projection screen for use with a diverging illumination source |
US9176370B1 (en) | 2014-06-12 | 2015-11-03 | Google Inc. | High contrast rear projection screen |
TW201609593A (zh) * | 2014-09-09 | 2016-03-16 | 鴻海精密工業股份有限公司 | 窗戶玻璃 |
US9250508B1 (en) | 2014-11-17 | 2016-02-02 | Google Inc. | Rear projection screen with pin-hole concentrator array |
US9256115B1 (en) | 2014-12-29 | 2016-02-09 | Google Inc. | Dual sided lens array using clear beads |
US9519206B1 (en) | 2015-06-25 | 2016-12-13 | X Development Llc | High contrast projection screen with stray light rejection |
US9772550B2 (en) | 2015-08-04 | 2017-09-26 | X Development Llc | Apparatus, system and method for mitigating contrast artifacts at an overlap region of a projected image |
KR102107039B1 (ko) * | 2018-12-28 | 2020-05-06 | 부경대학교 산학협력단 | 태양광 확산기 |
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- 2004-10-13 TW TW093130942A patent/TWI356969B/zh not_active IP Right Cessation
- 2004-10-14 EP EP04792368A patent/EP1674927A1/en not_active Withdrawn
- 2004-10-14 CN CNA2004800299323A patent/CN1867864A/zh active Pending
- 2004-10-14 JP JP2005514648A patent/JP4556872B2/ja not_active Expired - Fee Related
- 2004-10-14 WO PCT/JP2004/015136 patent/WO2005036260A1/ja not_active Application Discontinuation
- 2004-10-14 KR KR1020067006950A patent/KR20060090701A/ko not_active Application Discontinuation
- 2004-10-14 US US10/575,250 patent/US20070115548A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
KR20060090701A (ko) | 2006-08-14 |
CN1867864A (zh) | 2006-11-22 |
TWI356969B (en) | 2012-01-21 |
EP1674927A1 (en) | 2006-06-28 |
US20070115548A1 (en) | 2007-05-24 |
JPWO2005036260A1 (ja) | 2007-11-22 |
TW200523662A (en) | 2005-07-16 |
JP4556872B2 (ja) | 2010-10-06 |
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