Patent Application Titled “Application Specific Integrated Circuit For Waveguide Display” Published Online (USPTO 20190227320)

Engineering Business Daily |

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Engineering Business Daily -- According to news reporting originating from Washington, D.C., by NewsRx journalists, a patent application by the inventors Bonar, James Ronald (Redmond, WA); Valentine, Gareth (Redmond, WA), filed on , was made available online on .

The assignee for this patent application is Facebook Technologies LLC (Menlo Park, California, United States).

Reporters obtained the following quote from the background information supplied by the inventors: “This disclosure relates generally to near-eye display (NED) systems with waveguide displays. In conventional NED systems, a single polychromatic light source is typically driven by a single application specific integrated circuit (ASIC) assembly. However, such a configuration may not be suitable for an NED system that uses multiple light sources (for example, multiple monochromatic light sources).”

In addition to obtaining background information on this patent application, NewsRx editors also obtained the inventors’ summary information for this patent application: “As will be described in greater detail below, the instant disclosure describes ASIC configurations for NED systems wherein images from multiple monochromatic light sources are projected into a waveguide. A waveguide may represent an optical component that permits lateral propagation of a received image and, in some embodiments, replication of the image.

“One aspect includes a waveguide display system with a projector assembly that projects image light into the waveguide. The projector assembly may have multiple monochromatic two-dimensional emitter arrays, each with emitters of a single color and projecting a monochromatic two-dimensional image. An ASIC assembly having one or more ASICs may be configured to drive each of the monochromatic emitter arrays to emit separate single-color images along a common axis for projection into the waveguide assembly.

“In some embodiments, a separate ASIC may drive each monochromatic emitter array so that if three arrays are used (for example, one red, one green, and one blue), three ASICs are used. One ASIC may be bonded to and drive the first monochromatic emitter array, another ASIC is bonded to and drives the second monochromatic emitter array, etc.

“In some embodiments, a single ASIC may drive each monochromatic emitter array so that if three arrays are used (for example, one red, one green, and one blue), only one ASIC is used. The same ASIC may be bonded to and drive the first monochromatic emitter array, may be bonded to and drive the second monochromatic emitter array, etc.

“In some embodiments, a single ASIC may drive each monochromatic emitter array but not be directly bonded to the arrays. A silicon interposer may be bonded (on one side) to the ASIC, and the interposer may be bonded (on the other side) to each of the monochromatic emitter arrays. The ASIC may drive the arrays via the interposer.

“In some embodiments, a single ASIC may drive each monochromatic emitter array via an interposer. However, the ASIC may be configured to drive the monochromatic emitter arrays in sequence by, for example, sequentially addressing common cathodes and anodes.

“In some embodiments, monochromatic images may be combined within the waveguide to produce polychromatic images, and polychromatic images may be displayed to a user wearing a near eye display including the waveguide.

“Some embodiments may include the steps of bonding a first monochromatic emitter array and a second monochromatic emitter array to one or more ASICs configured to drive the first and second monochromatic emitter arrays to project image light into a waveguide. The image light may include at least (a) a two-dimensional monochromatic image in a first color emitted by the first monochromatic emitter array and (b) a two-dimensional monochromatic image in a second color emitted by the second monochromatic emitter array. The first and second colors may be different from each other, and the two-dimensional monochromatic images may be projected along a common axis.

“In some embodiments, a near-eye display system may include a frame configured to be secured to a user’s head (using, for example, eyeglass temples, goggle straps, etc.), a waveguide coupled to the frame, and one or more projector assemblies configured to project image light into the waveguide. Each of the one or more projector assemblies may include a first monochromatic emitter array having a plurality of emitters of a first color disposed in a two-dimensional configuration and a second monochromatic emitter array having a plurality of emitters of a second, different color disposed in a two-dimensional configuration. At least one application specific integrated circuit (ASIC) may be configured to drive the first and second monochromatic emitter arrays to emit images of the first and second colors along a common axis.

“Features from any of the above-mentioned embodiments may be used in combination with one another in accordance with the general principles described herein. These and other embodiments, features, and advantages will be more fully understood upon reading the following detailed description in conjunction with the accompanying drawings and claims.”

The claims supplied by the inventors are:

“1. A device comprising: a waveguide; and one or more projector assemblies configured to project image light into the waveguide, wherein each of the one or more projector assemblies comprises: a first monochromatic emitter array having a plurality of emitters of a first color disposed in a two-dimensional configuration; and a second monochromatic emitter array having a plurality of emitters of a second color disposed in a two-dimensional configuration; and at least one application specific integrated circuit (ASIC) configured to drive the first and second monochromatic emitter arrays to emit images of the first and second colors along a common axis, the first color being different from the second color.

“2. The device of claim 1, wherein the at least one ASIC comprises: a first ASIC configured to drive the first monochromatic emitter array; and a second ASIC configured to drive the second monochromatic emitter array.

“3. The device of claim 2, wherein each of the one or more projector assemblies further comprises a third monochromatic emitter array having a plurality of emitters disposed in a two-dimensional configuration, and wherein the at least one ASIC comprises a third ASIC configured to drive the third monochromatic emitter array to emit images of a third color along the common axis, the third color being different from the first and second colors.

“4. The device of claim 3, wherein monochromatic images of the first, second, and third color are combined within the waveguide to produce polychromatic images.

“5. The device of claim 4, wherein the polychromatic images are displayed to a user wearing a near eye display comprising the waveguide.

“6. The device of claim 1, wherein the at least one ASIC comprises a single ASIC configured to drive at least the first monochromatic emitter array and the second monochromatic emitter array.

“7. The device of claim 6, wherein the single ASIC is configured to drive in sequence each of the first monochromatic emitter array and the second monochromatic emitter array by sequentially addressing common cathodes and anodes.

“8. The device of claim 6, wherein: each of the one or more projector assemblies further comprises a third monochromatic emitter array having a plurality of emitters disposed in a two-dimensional configuration and emitting a third color different from the first and second color, and the at least one ASIC comprises a single ASIC configured to drive at least the first monochromatic emitter array, the second monochromatic emitter array, and the third monochromatic emitter array to emit images of the first, second, and third colors, respectively, along the common axis.

“9. The device of claim 8, further comprising a silicon interposer bonded on a first side to the first monochromatic emitter array, the second monochromatic emitter array, and the third monochromatic emitter array, and bonded on a second side, opposite the first side, to the single ASIC, the silicon interposer providing an interface between (a) the first monochromatic emitter array, the second monochromatic emitter array, and the third monochromatic emitter array and (b) the single ASIC.

“10. The device of claim 9, wherein the single ASIC is configured to drive in sequence each of the first monochromatic emitter array, the second monochromatic emitter array, and the third monochromatic emitter array by sequentially addressing common cathodes and anodes.

“11. The device of claim 6, further comprising a silicon interposer bonded on a first side to at least the first monochromatic emitter array and the second monochromatic emitter array, and bonded on a second side, opposite the first side, to the single ASIC, the silicon interposer providing an interface between (a) the first monochromatic emitter array and the second monochromatic emitter array and (b) the single ASIC.

“12. The device of claim 1, wherein the waveguide combines monochromatic images projected by the first and second monochromatic emitter arrays.

“13. A method comprising: bonding a first monochromatic emitter array and a second monochromatic emitter array to at least one ASIC, wherein the at least one ASIC is configured to drive the first and second monochromatic emitter arrays to project image light into a waveguide, and wherein the image light comprises: a two-dimensional monochromatic image in a first color emitted by the first monochromatic emitter array; and a two-dimensional monochromatic image in a second color emitted by the second monochromatic emitter array, the first and second colors being different from each other, with the two-dimensional monochromatic images being projected along a common axis.

“14. The method of claim 13, wherein the at least one ASIC is configured to drive in sequence each of the first monochromatic emitter array, the second monochromatic emitter array, and a third monochromatic emitter array by sequentially addressing common cathodes and anodes.

“15. The method of claim 13, wherein the at least one ASIC comprises: a first ASIC configured to drive the first monochromatic emitter array; a second ASIC configured to drive the second monochromatic emitter array; and a third ASIC configured to drive a third monochromatic emitter array.

“16. The method of claim 13, wherein the at least one ASIC comprises a single ASIC configured to drive at least two of the first monochromatic emitter array, the second monochromatic emitter array, and a third monochromatic emitter array.

“17. The method of claim 16, wherein the single ASIC is configured to drive in sequence each of the first monochromatic emitter array, the second monochromatic emitter array, and the third monochromatic emitter array by sequentially addressing common cathodes and anodes.

“18. The method of claim 13, wherein at least the two-dimensional monochromatic images of the first and second colors are combined within the waveguide to produce polychromatic images.

“19. The method of claim 13, further comprising: bonding a silicon interposer on a first side to the first monochromatic emitter array, the second monochromatic emitter array, and a third monochromatic emitter array; and bonding the silicon interposer on a second side, opposite the first side, to at least one ASIC, wherein the silicon interposer provides an interface between (a) the first monochromatic emitter array, the second monochromatic emitter array, and the third monochromatic emitter array, and (b) the at least one ASIC.

“20. A near-eye display system comprising: a frame configured to secure to a user’s head; a waveguide coupled to the frame; and one or more projector assemblies configured to project image light into the waveguide, wherein each of the one or more projector assemblies comprises: a first monochromatic emitter array having a plurality of emitters of a first color disposed in a two-dimensional configuration; and a second monochromatic emitter array having a plurality of emitters of a second color disposed in a two-dimensional configuration; and at least one application specific integrated circuit (ASIC) configured to drive the first and second monochromatic emitter arrays to emit images of the first and second colors along a common axis, the first color being different from the second color.”

For more information, see this patent application: Bonar, James Ronald; Valentine, Gareth. Application Specific Integrated Circuit For Waveguide Display. Filed and posted . Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190227320%22.PGNR.&OS=DN/20190227320&RS=DN/20190227320

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