US20130188149A1 - Three dimensional image projector - Google Patents
Three dimensional image projector Download PDFInfo
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- US20130188149A1 US20130188149A1 US13/357,737 US201213357737A US2013188149A1 US 20130188149 A1 US20130188149 A1 US 20130188149A1 US 201213357737 A US201213357737 A US 201213357737A US 2013188149 A1 US2013188149 A1 US 2013188149A1
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- light
- pbs
- light source
- imaging device
- image
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/14—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing polarised light
-
- 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
- G02B27/1026—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with reflective spatial light modulators
- G02B27/1033—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with reflective spatial light modulators having a single light modulator for all colour channels
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
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- 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
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- 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
- G03B35/00—Stereoscopic photography
- G03B35/18—Stereoscopic photography by simultaneous viewing
- G03B35/26—Stereoscopic photography by simultaneous viewing using polarised or coloured light separating different viewpoint images
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- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Projection Apparatus (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
A system is provided for projecting a three-dimensional image. The system includes a first light source, the first light source emitting light in a first direction and a second light source emitting light in a second direction. A beam splitter device is disposed adjacent each light source and an imaging device is disposed adjacent the beam splitter device. Light from the first light source and the second light source travel a common optical path to a projector lens assembly.
Description
- The present invention relates to a stereoscopic three dimensional image projector, and more specifically, to a small three dimensional projector usable with passive glasses.
- Three dimensional (3D) movies and pictures have become a popular form of entertainment due to the increased realism of the images. 3D images utilize the human physical trait of binocular vision. Human eyes are spaced about 2 inches (5 centimeters) apart; therefore each eye sees the world from a slightly different perspective. The brain receives both images and has a binocular vision function that correlate the difference between what each eye sees to determine distance. The determination of the distance provides the three-dimensional effect that a person sees.
- To create a binocular image on a two dimensional surface, such as a movie or television screen, the user typically wears glasses. The glasses alter the way that the user views the images to create the simulated 3D effect. Typically there are two types of glasses, passive glasses and active glasses. The type of glasses used will depend on the type of image projection system being used.
- Passive glasses rely upon an optical effect created by using different lenses for each eye. The projection system emits a sequential series of images where subsequent images are slightly offset. The images are arranged such that the user sees the first image through a first lens of the glasses (e.g. the right eye) and the second image is seen with the other lens (e.g. the left eye). Since the images are projected quickly, the user does not notice the multiple images, but rather sees a three dimensional effect. Originally, passive glasses used different color lenses to filter out images; however this limited the use of 3D images when full color images are desired. To alleviate this issue, polarized lenses were developed where each lens of the glasses allowed the transmission of different polarized light. The polarized passive lenses allowed for full color 3D images to be transmitted. Passive lenses are more common with projector type systems, such as movie theaters for example, where multiple projectors may be used to project the images on a screen.
- The development of 3D television systems created a new challenge as there typically isn't enough room for multiple projectors. To accommodate this, active lenses were created. With an active lens, the glasses wirelessly communicate with the projector to synchronize the glasses operation with the images being displayed. With active glasses, the lenses are typically liquid crystal displays that can switch between transmitting light and blocking light. In this way, the glasses may rapidly switch the left and right lenses between clear and opaque. While the glasses are switching, the television is projecting a series of sequential images. When this switching is synchronized between the television and the glasses, the user experiences a three dimensional effect.
- Accordingly, while existing three dimensional projectors are suitable for their intended purpose a need for improvement remains, particularly in providing a system with a single projector that can project images viewable with passive glasses.
- According to one embodiment of the invention, a method is provided having a first light source and a second light source. A first polarizing beam splitter (PBS) is disposed adjacent the first light source and a second PBS is located adjacent the second light source. A first imaging device is adjacent the first PBS and a second imaging device is adjacent the second PBS. Additionally, disposed between the first PBS and the second PBS is a third PBS. The first light source emits a first light. The first light is reflected from the first PBS onto the first imaging device. The image reflects from the first imaging device to the third PBS.
- According to another embodiment of the present invention, a method of projecting a three dimensional image is provided having a first light source with a first polarization and a second light source with a second orientation wherein the first polarization is orthogonal to the second polarization. A first eye image of a first color is projected from the first light source. A second eye image of the same first color is projected from the second light source. A first eye image of a second color is projected from the first light source. A second eye image of the same second color is projected from the second light source. A first eye image of a third color is projected from the first light source. A second eye image of a third color is projected from the second light source.
- According to another embodiment of the present invention, a projector system for a portable electronic device is provided having a first light source that emits light having a first polarization. A second light source emits a light having a second polarization. A first polarizing beam splitter device (PBS) is adjacent the first light source and a second PBS is adjacent the second PBS. A first imaging device is adjacent the first PBS and a second imaging device is adjacent the second PBS. A third PBS is disposed between the first PBS and the second PBS. A projection lens assembly is located on one side of the third PBS and a mirror is located on the opposite side of the third PBS.
- Additional features and advantages are realized through the techniques of the present invention. Other embodiments and aspects of the invention are described in detail herein and are considered a part of the claimed invention. For a better understanding of the invention with the advantages and the features, refer to the description and to the drawings.
- The subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The forgoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
-
FIG. 1 is a schematic view of a three-dimensional image projector in accordance with an embodiment of the invention; -
FIG. 2 is a flow chart for a method of operating a three-dimensional image projector in accordance with an embodiment of the invention; and, -
FIG. 3 is another flow chart for a method of operating the three-dimensional image projector in accordance with an embodiment of the invention. - Contemporary three-dimensional (3D) image projectors that use passive glasses have typically use two projectors. Previous efforts to use only a single projector rely upon an active lens within the projector that switches between the sequential images. It should be appreciated that substantial costs may be involved in using redundant projectors or having a costly active lens. Further, these techniques do not scale well as users desire comparable performance from smaller and smaller projector packages.
- A second type of projector uses active glasses having a liquid crystal diode (LCD) lens that coordinates with the projector (typically a television). The active glasses alternately block one of the lenses such that the user will see sequential images through alternating lenses. While active glasses perform well to create the 3D effect for the user, they also have some less desirable characteristics. The active glasses require an energy source such as a battery that needs to be periodically recharged or replaced. If the communication between the television and the glasses is interrupted, the 3D effect may be lost. Further, due to the complexity of the system, the active glasses tend to be much more costly.
- With reference now to
FIG. 1 , a three-dimensional projector 20 is shown for projecting a three-dimensional (3D) image in accordance with an embodiment of the invention. Theprojector 20 includes afirst light source 22 and a secondlight source 24 arranged to emit light in opposite directions. The direction of light from firstlight source 22, indicated byarrow 26, is substantially 180 degrees apart from the direction of the light from secondlight source 24, as indicated byarrow 28. The first and secondlight sources centerline 23. In one embodiment, the first and secondlight sources first light source 22 is spaced a distance D1 from acenterline 23 of the projector and the secondlight source 24 is spaced a distance D2 from thecenterline 23. The first and secondlight sources centerline 23 such that distance D1 is equal to distance D2. In the exemplary embodiment, each light source includes three monochromatic light emitting diodes (LED), ared LED 30, agreen LED 32 and ablue LED 34. The LED's 30, 32, 34 are arranged to form three sides of a square and direct light toward the center of the first and secondlight sources LED light collection optic 36. - The
light collection optic 36 directs the light from the LED's 30, 32, 34 into adichroic color combiner 38. Thedichroic color combiner 38 combines light from the LED's to create a desired light color. The light from thefirst light source 22 exits via anopen side 40 and passes through a first fly'seye lens 42 and a firstpre-polarizer lens 44. The first fly'seye lens 42 consists of an array of lenslets that have the effect of breaking the transmitted light into many components and projecting them evenly over the field of view. The result is even, bright illumination without any reduction in light intensity at the periphery of the projected light. The firstpre-polarizer lens 44 changes the polarization of the outgoing light to have a desired polarization characteristic that is suitable for the imaging device being used. Once the light leaves first thepre-polarization lens 44, the light passes into a first polarizing beam splitter device 54 (PBS). - Similar to the
first light source 22, the light from the secondlight source 24 leaves anopen side 46 and enters a second fly'seye lens 48 and asecond pre-polarization lens 50. After being conditioned by theselenses second PBS 58. - A
PBS first PBS 54 is positioned adjacent to thepre-polarizer lens 44 and asecond PBS 58 is located adjacent topre-polarizer lens 50. First andsecond imaging devices second PBS first PBS 54 and thefirst imaging device 60 are arranged on an opposite side ofcenterline 23 from thesecond PBS 58 andsecond imaging device 64. Thefirst imaging device 60 and thesecond imaging device 64 may be arranged such that the imaging surfaces 62, 66 are on opposing sides ofcenterline 23. In still another embodiment, the imaging surfaces are disposed to reflect light in a direction substantially perpendicular to thearrows imaging devices imaging surface respective PBS lighting source surface respective imaging device respective PBS third PBS 56. For example, if the light was emitted by thefirst light source 22, the first light, reflecting off of thesurface 62 of thefirst imaging device 60, will pass through thefirst PBS 54 to thethird PBS 56 which in turn reflects the first light into aprojection lens assembly 70 and out of thedevice 20. Similarly, if the light was emitted by the secondlight source 24, the second light will reflect off of thesurface 66 ofsecond imaging device 64, and pass throughsecond PBS 58 tothird PBS 56. Because the polarization of the second light is orthogonal to the polarization of the first light, thethird PBS 56 reflects the light outwards in a direction opposite theprojection lens assembly 70 and towards amirror 68. The second light reflects off ofmirror 68 and reentersthird PBS 56. Because the second light enters thethird PBS 56 from a different angle, the light passes throughPBS 56 and continues outward towards theprojection lens assembly 70 along the same optical path as the first light. Thus the light from both the first and secondlight sources projector 20 and is transmitted along a common optical path. In the present embodiment, use of anLCoS imaging device - To create a 3D image, the image content for the left and right eye needs to be independently modulated with orthogonal polarizations of light. The light emitted from each light source has a polarization orthogonal to the light emitted from the other light source; consequently, the first light source provides all of the image content for a first eye, and the second light source provides all of the image content for the other or second eye. Referring to the flow chart in
FIG. 2 , theprojector device 20 works by activating the first and second light sources sequentially such that both the left and right eye images of a first color are projected before either the left or right eye image of a second color. Inblock 90, a light source, such aslight source 22, emits a light such that an image for a first eye, such as the left eye, is projected fromprojector 20. This image will be a first color from the plurality of LEDs within the light source, such as red. Inblock 110, another light source, such aslight source 24, will similarly emit a light of the same color, such that an image for a second eye, for example the right eye, is projected out ofprojector 20. Once both light sources have projected an image of a first color, thefirst light source 22 will then project an image of a second color, such as blue, as inblock 130. Inblock 132, the second light source will then project an image of the same second color. This pattern repeats inblocks light sources - In some embodiments, it should be appreciated that the combination of
light sources LCoS devices - The
projector 20 may also include anoptional feedback circuit 25. Thefeedback circuit 25 is electrically coupled to communicate with thefirst light source 22, the secondlight source 24, the first andsecond PBS second imaging devices feedback circuit 25 provides a modulation signal to thelight sources feedback circuit 25 may additionally include LED drivers for both the first and secondlight sources feedback circuit 25 provides functionality to enable eachlight source surface - Referring now to
FIG. 3 , anothermethod 80 is shown for operating a three dimensional image projector. Themethod 80 first synchronizes the light sources inblock 84 and creates a first eye image inblock 90. To create the first image, a light source, such asfirst light source 22, emits a first light of a first color LED, for example red, from the plurality of LEDS within the first light source inblock 92. Inblock 94, the light is combined by thedichroic color combiner 38 and passes through a first fly'seye lens 42 which projects the transmitted light evenly over the field of view. The light then passes through thepre-polarizer lens 44, as shown inblock 96, where the light is given a certain polarization such that it reflects from thefirst PBS 54. The light from the first light source reflects off of thefirst PBS 54 and onto afirst imaging device 60, such as an LCoS imaging device. Inblock 98, the first light reflects off of thefirst imaging device 60 and through thefirst PBS 54 to a middle orthird PBS 56 disposed between the first andsecond PBS third PBS 56 to aprojection lens assembly 70 to project a first eye image of a first color, such as a red image for the left eye. After the first eye image of a first color is projected, a second eye image of the same first color is then projected, as shown inblock 110. To project this second eye image, in block 112 a light source, such as secondlight source 24, emits a second light of the same color as the first light emitted byfirst light source 22. The second light similarly is combined by adichroic color combiner 38 and passes through a second fly'seye lens 48 which projects the transmitted light evenly over the field of view collected by a dichroic mirror. Inblock 116, the second light is polarized by secondpre-polarizer lens 50 such that it reflects from thesecond PBS 58 and onto thesecond imaging device 64. The light then reflects off of thesurface 66 of thesecond imaging device 64 inblock 118, and through thesecond PBS 58 to athird PBS 56. - Because of the polarization of the second light, which is orthogonal to the light emitted by the first light source, the second light is reflected from
third PBS 56 in a direction opposite theprojection lens assembly 70 to amirror 68 as shown inblock 120. The second light reflects off themirror 68, back through thethird PBS 56 and outwards towards theprojection lens assembly 70 along the same optical path as the first light. In one example, this second light may be the red image for the right eye. Once both the first and second light sources have emitted images using the same first color LED, the first light source will then emit another image for the first eye using a second color LED from the plurality of LEDS within the first light source, as shown inblock 130. Once the second color image from first light source has been projected, the second light source will similarly produce an image using the same color LED as the prior first light source emission, but a different color LED than the previous second light source image. For example, if the first set of left and right eye images were red, the next set of left and right eye images from the first and second light sources could be either green or blue in color. This cycle continues inblocks projector device 20 in the color sequence. - Embodiments of the present invention provide for a small, reliable three-dimensional projector. Embodiments of the present invention provide advantages of having multiple light sources that are arranged to have the same path length for projecting the image. Embodiments provide advantages in emitting a three-dimensional image usable with passive glasses.
- The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one more other features, integers, steps, operations, element components, and/or groups thereof.
- The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the invention. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated
- The flow diagrams depicted herein are just one example. There may be many variations to this diagram or the steps (or operations) described therein without departing from the spirit of the invention. For instance, the steps may be performed in a differing order or steps may be added, deleted or modified. All of these variations are considered a part of the claimed invention.
- While the preferred embodiment to the invention had been described, it will be understood that those skilled in the art, both now and in the future, may make various improvements and enhancements which fall within the scope of the claims which follow. These claims should be construed to maintain the proper protection for the invention first described.
Claims (11)
1-13. (canceled)
14. A system comprising:
a first light source emitting light having a first polarization;
a second light source emitting light having a second polarization;
a first beam splitter device (PBS) adjacent the first light source;
a second PBS adjacent the second light source;
a first imaging device adjacent the first PBS;
a second imaging device adjacent the second PBS;
a third PBS disposed between the first PBS and the second PBS;
a projection lens assembly located adjacent the third PBS; and,
a mirror disposed on the side of the third PBS opposite the projection lens assembly.
15. The system of claim 14 wherein the first polarization is orthogonal to the second polarization.
16. The system of claim 14 wherein the first light source emits a first light in a first direction and the second light source emits a second light in a second direction, the second direction being opposite the first direction.
17. The system of claim 14 wherein the first imaging device and the second imaging device are LCoS devices.
18. The system of claim 14 wherein the light emitted by the first light source and the light emitted by the second light source are transmitted along the same optical path from the third PBS to the projection lens assembly.
19. The system of claim 14 further comprising:
a first fly's eye lens arranged between the first light source and the first PBS; and,
a first pre-polarizer lens arranged between the first fly's eye lens and the first PBS.
20. The system of claim 19 further comprising:
a second fly's eye lens arranged between the second light source and the second PBS; and,
a second pre-polarizer lens arranged between the second fly's eye lens and the second PBS.
21. The system of claim 19 wherein the first light source comprises:
a plurality of first LED devices;
a plurality of first light collection optics, each of the plurality of first light collection optics associated with one of the plurality of first LED devices; and,
a first dichroic color combiner disposed between the plurality of first light collection optics, the first dichroic color combiner arranged to direct light from the plurality of first LED devices into the first fly's eye lens.
22. The system of claim 20 wherein the second light source comprises:
a plurality of second LED devices;
a plurality of second light collection optics, each of the plurality of second light collection optics associated with one of the plurality of second LED devices; and,
a second dichroic color combiner disposed between the plurality of second light collection optics, the second dichroic color combiner arranged to direct light from the plurality of second LED devices into the second fly's eye lens.
23. The system of claim 14 further comprising a feedback circuit coupled to the first light source, the second light source, the first PBS, the second PBS, the first imaging device, and the second imaging device.
Priority Applications (7)
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US13/357,737 US20130188149A1 (en) | 2012-01-25 | 2012-01-25 | Three dimensional image projector |
US13/672,980 US8944604B2 (en) | 2012-01-25 | 2012-11-09 | Three dimensional image projector with dual light modulators |
DE112013000441.0T DE112013000441B4 (en) | 2012-01-25 | 2013-01-22 | Projector for three-dimensional images and method for providing a projector |
CN201380006752.2A CN104081275B (en) | 2012-01-25 | 2013-01-22 | Method and system for projected image |
GB1414681.5A GB2513783B (en) | 2012-01-25 | 2013-01-22 | Image projector |
PCT/CN2013/070813 WO2013110235A1 (en) | 2012-01-25 | 2013-01-22 | Three dimensional image projector |
US14/051,477 US8960912B2 (en) | 2012-01-25 | 2013-10-11 | Three dimensional image projector |
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US13/357,737 US20130188149A1 (en) | 2012-01-25 | 2012-01-25 | Three dimensional image projector |
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US13/672,980 Expired - Fee Related US8944604B2 (en) | 2012-01-25 | 2012-11-09 | Three dimensional image projector with dual light modulators |
US14/051,477 Expired - Fee Related US8960912B2 (en) | 2012-01-25 | 2013-10-11 | Three dimensional image projector |
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US14/051,477 Expired - Fee Related US8960912B2 (en) | 2012-01-25 | 2013-10-11 | Three dimensional image projector |
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US20140036164A1 (en) * | 2012-08-03 | 2014-02-06 | Seiko Epson Corporation | Projector |
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-
2013
- 2013-01-22 GB GB1414681.5A patent/GB2513783B/en active Active
- 2013-01-22 CN CN201380006752.2A patent/CN104081275B/en not_active Expired - Fee Related
- 2013-01-22 DE DE112013000441.0T patent/DE112013000441B4/en active Active
- 2013-01-22 WO PCT/CN2013/070813 patent/WO2013110235A1/en active Application Filing
- 2013-10-11 US US14/051,477 patent/US8960912B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140036164A1 (en) * | 2012-08-03 | 2014-02-06 | Seiko Epson Corporation | Projector |
US9250507B2 (en) * | 2012-08-03 | 2016-02-02 | Seiko Epson Corporation | Projector |
Also Published As
Publication number | Publication date |
---|---|
GB2513783B (en) | 2016-12-21 |
WO2013110235A1 (en) | 2013-08-01 |
US8960912B2 (en) | 2015-02-24 |
DE112013000441B4 (en) | 2022-02-17 |
CN104081275B (en) | 2017-08-29 |
US8944604B2 (en) | 2015-02-03 |
GB201414681D0 (en) | 2014-10-01 |
DE112013000441T5 (en) | 2014-09-11 |
GB2513783A (en) | 2014-11-05 |
US20130188153A1 (en) | 2013-07-25 |
CN104081275A (en) | 2014-10-01 |
US20140176911A1 (en) | 2014-06-26 |
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