Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B21/00—Projectors or projection-type viewers; Accessories therefor
  • G03B21/54—Accessories
  • G03B21/56—Projection screens
  • G03B21/60—Projection screens characterised by the nature of the surface
  • G03B21/62—Translucent screens
• • 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
  • G03B21/604—Polarised screens
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
  • H10K2102/301—Details of OLEDs
  • H10K2102/302—Details of OLEDs of OLED structures
  • H10K2102/3023—Direction of light emission
  • H10K2102/3031—Two-side emission, e.g. transparent OLEDs [TOLED]
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K50/00—Organic light-emitting devices
  • H10K50/80—Constructional details
  • H10K50/868—Arrangements for polarized light emission
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
  • H10K59/80—Constructional details
  • H10K59/8793—Arrangements for polarized light emission

Definitions

• This invention relates to displays, and specifically to transparent displays with an image that is visible from one side of the display but not the other.
• a display system includes a projection screen and a projector.
• the projection screen includes a retarder plate between a polarizer and a transparent screen.
• the projector projects an image through the polarizer and the retarder plate onto the transparent screen.
• the image is visible from a first side of the transparent screen but invisible from a second side of the transparent screen because any light passing twice through the retarder plate is blocked by the polarizer.
• the projection screen frees a person on the second side of the transparent screen from any distraction caused by the image while still allowing the person to look out through the projection screen.
• FIG. 1 illustrates a rear-projection transparent display system in one embodiment of the invention.
• FIG. 2 illustrates a transparent display system in one embodiment of the invention.
• Fig. 3 illustrates a transparent organic light-emitting diode that emits polarized light in one embodiment of the invention.
• FIG. 4 illustrates a transparent display system in one embodiment of the invention.
• Fig. 5 illustrates an alternative pixel of the transparent display of Fig. 4 in one embodiment of the invention.
• Fig. 1 illustrates a rear-projection transparent display system 100 in one embodiment of the invention.
• System 100 includes a projector 102 that generates an image "Q" toward a projection screen 104.
• Projector 102 can be a liquid crystal display (LCD) projector, a digital light processing (DLP) projector, a laser projector, or any other projection device.
• image Q can be a still image, a slideshow of still images, or a video stream.
• Projection screen 104 includes a polarizer 106, a retarder plate 108, and a transparent screen 110. Although shown spaced apart, polarizer 106, retarder plate 108, and transparent screen 110 may be directly mounted on each other. Image Q propagates from projector 102 through polarizer 106. After passing through polarizer 106, image Q only has polarized light.
• polarizer 106 is a linear polarizer and image Q only has linearly polarized light aligned along a first direction 112. Polarizer 106 may polarize light by absorption, scattering, or refraction.
• polarizer 106 is a glass panel with a linear polarizing film. Alternatively, polarizer 106 is made of a polarizing material.
• Image Q then propagates through retarder plate 108 and strikes transparent screen 110.
• retarder plate 108 is a quarter-wave plate.
• transparent screen 110 is a transparent diffusion screen such as the HoloProTM from G+B pronova GmbH of Germany, the HoIo Screen from dnp Denmark of Denmark, or the TransScreen from Laser Magic of Los Angeles, California.
• any light that travels back from transparent screen 110 through retarder 108 becomes linearly polarized along a second direction orthogonal to the first direction and is therefore blocked by polarizer 106.
• image Q is visible from one side of projection screen 104 and invisible from the other side of projection screen 104.
• projection screen 104 is a window or a glass door on the side of a building.
• a person 114 outside of the building sees image Q on projection screen 104 while a person 116 inside the building does not see image Q on projection screen 104.
• a small image Q may be visible on projection screen 104 to person 116. This occurs when projector 102 projects images with non-polarized light that is partly transmitted through polarizer 106 and partly reflected by polarizer 106.
• the small reflected image Q can be avoided by using an LCD projector 102 that produces images with light aligned along polarization direction 112.
• an additional polarizer 118 having polarization direction 112 can be placed before or on the lens of projector 102.
• polarizer 106 and retarder 108 may have different polarizing characteristics as long as polarizer 106 blocks out any return light from image Q that passes twice through retarder 108.
• FIG. 2 illustrates a transparent display system 200 in one embodiment of the invention.
• Display system 200 includes a transparent display 202 and a polarizer 204. Although shown spaced apart, transparent display 202 and polarizer 204 may be mounted directly on each other.
• Transparent display 202 has a transparent screen that generates an image "R" that is visible from both sides of the display.
• Image R consists of polarized light that propagates away from both sides of transparent display 202.
• image R can be a still image, a slideshow of still images, or a video stream.
• transparent display 202 is a transparent organic light-emitting diode (OLED) display that emits linearly polarized light.
• Fig. 3 illustrates that OLED display 202 consists of an organic emissive layer 302 sandwiched between a transparent cathode 304 and a transparent anode 306 on a transparent substrate 308.
• An example of a transparent OLED display is the TOLED® from Universal Display Corporation of Ewing, New Jersey.
• an orientation layer 310 is formed on anode 306 and then emissive layer 302 is formed on orientation layer 310.
• An example of an organic OLED that emits polarized light is described in "Polarized Emission of PPV Oligomers" by Lauhof et al., 2005 Conference of German Liquid Crystal Society.
• polarizer 204 may polarize light by absorption, scattering, and refraction.
• polarizer 204 is a glass panel with a linear polarizing film.
• polarizer 204 is made of a polarizing material.
• display system 200 is part of a window or a glass door on the side of a building.
• a person 206 outside of the building sees image R on display system 200 while a person 208 inside the building does not see image R on display system 200.
• a one-way vision film 210 is inserted between transparent display 202 and polarizer 204.
• One-way vision film 210 allows person 208 to look out through display system 200 but does not allow person 206 to look through display system 200 and into the building.
• one-way vision film 210 is a perforated film having a light color (e.g., white) on the side facing transparent display 202 and a dark color (e.g., black) on the side facing polarizer 204.
• Fig. 4 illustrates a transparent display system 400 in one embodiment of the invention.
• System 400 includes a screen 402 with an alternating pattern of nontransparent light-emitting pixels 404 and transparent non-emitting pixels 406. Thus, screen 402 appears at least semi-transparent as light can pass through transparent non-emitting pixels 406.
• the pattern of nontransparent light-emitting pixels 404 and transparent non- emitting pixels 406 can be varied as long as they are evenly distributed so screen 402 appears semi-transparent.
• the pattern consists of alternating lines of nontransparent light-emitting pixels 404 and transparent non-emitting pixels 406.
• the pattern consists of nontransparent light-emitting pixels 404 interspersed with transparent non-emitting pixels 406.
• nontransparent light-emitting pixels 404 are OLED pixels with transparent cathodes and anodes, and opaque substrates. Transparent cathodes and anodes are necessary so these conductive lines can run across the transparent non-emitting pixels without obscuring their transparency. Opaque substrates are necessary so that the OLED pixels only transmit light on one side of screen 402. In one embodiment, transparent non- emitting pixels 406 are simply dummy OLED pixels with transparent substrate and devoid of an emissive layer.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)
• Polarising Elements (AREA)
• Electroluminescent Light Sources (AREA)
• Overhead Projectors And Projection Screens (AREA)
• Liquid Crystal (AREA)
• Transforming Electric Information Into Light Information (AREA)
• Projection Apparatus (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=38249262

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (54)

Family Cites Families (38)

• 2006
  • 2006-03-03 US US11/367,687 patent/US7854513B2/en not_active Expired - Fee Related
• 2007
  • 2007-02-27 JP JP2008557396A patent/JP5133266B2/ja not_active Expired - Fee Related
  • 2007-02-27 WO PCT/US2007/005360 patent/WO2007103181A2/en not_active Ceased
  • 2007-02-27 CN CN2010101921462A patent/CN101887211A/zh active Pending
  • 2007-02-27 CN CNA2007800062839A patent/CN101390013A/zh active Pending
• 2010
  • 2010-11-12 US US12/945,080 patent/US8104895B2/en not_active Expired - Fee Related

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