Source: https://patents.google.com/patent/US9677741B2/en
Timestamp: 2018-07-21 00:46:34
Document Index: 347621556

Matched Legal Cases: ['§120', '§119', 'Application No. 61', '§119', 'Application No. 61', '§119', 'Application No. 61', 'Application No. 13870062']

US9677741B2 - Methods and apparatus for transparent display using scattering nanoparticles - Google Patents
US9677741B2
US9677741B2 US15090348 US201615090348A US9677741B2 US 9677741 B2 US9677741 B2 US 9677741B2 US 15090348 US15090348 US 15090348 US 201615090348 A US201615090348 A US 201615090348A US 9677741 B2 US9677741 B2 US 9677741B2
US15090348
US20160216600A1 (en )
This application claims the benefit, under 35 U.S.C. §120, of U.S. application Ser. No. 14/067,471, filed on Oct. 30, 2013, and entitled “Methods and Apparatus for Transparent Display Using Scattering Particles,” which application is hereby incorporated by reference in its entirety.
U.S. application Ser. No. 14/067,471 claims the benefit, under 35 U.S.C. §119(e), of U.S. Application No. 61/748,228, filed on Jan. 2, 2013, and entitled “Methods and Apparatus for Transparent Display Using Scattering Particles,” which application is hereby incorporated by reference in its entirety.
U.S. application Ser. No. 14/067,471 also claims the benefit, under 35 U.S.C. §119(e), of U.S. Application No. 61/748,259, filed on Jan. 2, 2013, and entitled “Methods and Apparatus for Transparent Display Using Up-Converting Particles,” which application is hereby incorporated by reference in its entirety.
U.S. application Ser. No. 14/067,471 also claims the benefit, under 35 U.S.C. §119(e), of U.S. Application No. 61/866,468, filed on Aug. 15, 2013, and entitled “Methods and Apparatus for Transparent Display Using Up-Converting Particles,” which application is hereby incorporated by reference in its entirety.
To produce an image on the screen 110, a beam-steering element 130, which may include a galvo-scanning mirror or acousto-optic deflector, directs the polychromatic beam 121 to different areas on the screen. In some cases, the beam-steering element 130 may a micro-electromechanical systems (MEMS) device integrated into the light source 120 (e.g., as in the MicroVision SHOWW+Laser Pico Projector). For example, the beam-steering element 130 may scan the polychromatic beam 121 along a raster pattern (or any other suitable scan pattern) while a controller 140 modulates the intensity of the monochromatic laser beams 123 emitted by the laser diodes 122 to produce the desired image(s) on the screen. The controller 140, which may include a processor, memory, communications interface, user interface, and any other suitable components, may control the beam-steering element 130 and the light source 120 in response to user input, input from a video or image data source, or both to form a particular image or series of images on the screen 110.
〈 σ sca 〉 = k 4 18 ⁢ π ⁢ ∑ j = 1 , 2 , 3 ⁢ ⁢  α j ⁡ ( ɛ )  2 , ( 1 )
〈 σ sca ⁡ ( λ 0 ) 〉 〈 σ sca ⁡ ( λ 0 + Δλ ) 〉 ≈  α j ⁡ ( ɛ ⁡ ( λ 0 ) ) α j ⁡ ( ɛ ⁡ ( λ 0 + Δλ ) )  2 . ( 3 )
σ sca ⁡ ( λ 0 ) σ sca ⁡ ( λ 0 + Δλ ) ≈ 1 +  Re ⁡ [ ɛ ⁡ ( λ 0 + Δλ ) - ɛ ⁡ ( λ 0 ) ] Im [ ɛ ⁡ ( λ 0 ) ]  2 . ( 4 )
at least one light source, in optical communication with the transparent substrate, to illuminate the transparent substrate with light comprising a first spectral component at a first wavelength and a second spectral component at a second wavelength; and
at least one nanoparticle, disposed on and/or within the transparent substrate, to scatter the first spectral component and the second spectral component and to transmit ambient light at other wavelengths in the visible spectrum.
2. The transparent display of claim 1, wherein the transparent substrate has a transmittance greater than 60% at wavelengths from about 390 nm to about 760 nm.
4. The transparent display of claim 1, wherein the at least one light source comprises a broadband light source.
5. The transparent display of claim 1, wherein the at least one light source comprises:
a first monochromatic light source to emit the first spectral component; and
a second monochromatic light source to emit the second spectral component.
6. The transparent display of claim 1, wherein the light further comprises a third spectral component at a third wavelength, and wherein the at least one nanoparticle is further configured to scatter the third spectral component.
7. The transparent display of claim 6, wherein the first wavelength is about 390 nm to about 490 nm, the second wavelength is about 490 nm to about 580 nm, and the third wavelength is about 580 nm to about 760 nm.
8. The transparent display of claim 7, wherein the at least one nanoparticle has a scattering cross section with:
a first peak having a first full-width half-maximum (FWHM) of about 1 nm to about 70 nm overlapping the first wavelength,
a second peak having a second FWHM of about 1 nm to about 70 nm overlapping the second wavelength, and
a third peak having a third FWHM of about 1 nm to about 70 nm overlapping the third wavelength.
9. The transparent display of claim 1, wherein the at least one nanoparticle comprises a nanoshell.
10. The transparent display of claim 9, wherein the nanoshell comprises at least one of titanium oxide and silicon.
11. The transparent display of claim 1, wherein the at least one nanoparticle comprises a silicon sphere having a radius of about 115 nm.
12. The transparent display of claim 1, wherein the at least one nanoparticle comprises a silica core and a silver shell disposed around the silica core.
13. The transparent display of claim 1, wherein the transparent display scatters about 90% to about 100% of incident light at the first wavelength and the second wavelength.
14. The transparent display of claim 1, wherein the at least one nanoparticle comprises a plurality of nanoparticles deposited in a predetermined pattern on the transparent substrate.
15. The transparent display of claim 1, further comprising:
a beam-steering element to direct the light to different areas of the transparent substrate so as to illuminate different ones of the at least one nanoparticle.
16. A method of operating a transparent display comprising at least one nanoparticle disposed on and/or within a transparent substrate, the method comprising:
illuminating the at least one nanoparticle with light having a first spectral component at a first wavelength and a second spectral component at a second wavelength so as to scatter at least a portion of the first spectral component and the second spectral component towards a viewer, the at least one nanoparticle transmitting ambient light at other wavelengths in the visible spectrum.
17. The method of claim 16, wherein illuminating the at least one nanoparticle comprises illuminating the at least one nanoparticle using a broadband light source.
18. The method of claim 16, wherein illuminating the at least one nanoparticle comprises:
illuminating the at least one nanoparticle with a first monochromatic light source transmitting the first spectral component; and
illuminating the at least one nanoparticle with a second monochromatic light source transmitting the second spectral component.
19. The method of claim 16, wherein the at least one nanoparticle is further configured to scatter a third spectral component at a third wavelength.
20. The method of claim 19, wherein illuminating the at least one nanoparticle comprises:
21. A transparent display comprising:
a first monochromatic light source to illuminate the transparent substrate with a first monochromatic beam at a first wavelength;
a second monochromatic light source to illuminate the transparent substrate with a second monochromatic beam at a second wavelength; and
at least one nanoparticle, disposed on the transparent substrate, to scatter the first monochromatic beam and the second monochromatic beam and to transmit ambient light at other wavelengths in the visible spectrum,
wherein the at least one nanoparticle has a scattering cross section with a first peak having a first full-width half-maximum (FWHM) of about 1 nm to about 70 nm overlapping the first wavelength and a second peak having a second FWHM of about 1 nm to about 70 nm overlapping the second wavelength.
US15090348 2013-01-02 2016-04-04 Methods and apparatus for transparent display using scattering nanoparticles Active US9677741B2 (en)
US14067471 Continuation US9335027B2 (en) 2013-01-02 2013-10-30 Methods and apparatus for transparent display using scattering nanoparticles
US15237800 Continuation US9927616B2 (en) 2013-01-02 2016-08-16 Methods and apparatus for transparent display using scattering nanoparticles
US15237800 Continuation-In-Part US9927616B2 (en) 2013-01-02 2016-08-16 Methods and apparatus for transparent display using scattering nanoparticles
US20160216600A1 true US20160216600A1 (en) 2016-07-28
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