Display system with optical device

Abstract

To provide an optical device including a transmitter and receiver arranged behind a display screen.SOLUTION: A display system includes a display screen layer, a coupling region, an upper guide, a first coupler, a second coupler, and an optical element. The coupling region may be positioned along a sidewall of the display screen layer, may transmit a beam between the optical element and the upper guide, and may transmit the beam between the first coupler and the second coupler. The first coupler may be positioned along a front surface of the upper guide and may couple a beam through the front surface of the upper guide. The second coupler may be positioned between the coupling region and the upper guide and may couple the beam between the coupling region and the upper guide. The optical element may be positioned below a back surface of the upper guide. A computing device includes the display system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001]

[0001] Computing devices (e.g., cell phones, tablets, laptops, desktops, etc.) may include display screens with integrated optical devices. The computing devices may use the transmitters and / or receivers of the optical devices for facial recognition, time-of-flight 3D sensing, structured light 3D sensing, etc. [Background technology]

[0002] To this end, the transmitter of the optical device may include a flood illuminator for facial recognition, an illuminator for time-of-flight 3D sensing, a dot projector for structured light 3D sensing, etc. Additionally, the receiver of the optical device may include a camera (e.g., a red-green-blue (RBG) sensor), an infrared (IR) sensor, etc. to receive the signal transmitted by the transmitter. Currently, such transmitters and receivers are integrated into separate areas of the display screen, which reduces the usable area of ​​the display screen for presenting images. For example, a cell phone may place the transmitter and receiver of the optical device within a bevel or notch on the top edge of an OLED screen. Similarly, a laptop may place the transmitter and receiver of the optical device within a bevel or notch on the top edge of an LED screen. Such a bevel or notch increases the overall size of the computing device and / or reduces the usable area of ​​the display screen. Summary of the Invention

[0003]

[0002] An optical device comprising a transmitter and a receiver disposed behind a display screen is shown and / or described with reference to at least one of the figures and more fully set forth in the claims. The placement of the transmitter and / or receiver behind the display screen may enable embodiments in which bevels or notches are reduced and / or eliminated compared to conventional placement of the transmitter and / or receiver.

[0004]

[0003] These and other advantages, aspects, and novel features of the present disclosure, as well as details of illustrated embodiments thereof, will be more fully understood from the following description and drawings.

[0004] The various features and advantages of the present disclosure may be more readily understood by reference to the following detailed description taken in conjunction with the accompanying drawings, in which like reference numerals indicate like structural elements, and in which: [Brief explanation of the drawings]

[0005] [Figure 1]

[0005] FIG. 1 is a block diagram of a computing device including a display system including an optical device and a display screen. [Figure 2A]

[0006] FIG. 2A illustrates one embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 2B] FIG. 2B illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 3A]

[0007] FIG. 3A illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 3B] FIG. 3B illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 4A]

[0008] FIG. 4A illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 4B] FIG. 4B illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 5A]

[0009] FIG. 5A illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 5B] FIG. 5B illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 6A]

[0010] FIG. 6A illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 6B] FIG. 6B illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. [Figure 7]

[0011] 2 illustrates an embodiment of a display system including a display screen layer and an optical device suitable for the optical device and display screen of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0006]

[0012] The following discussion provides various examples of optical devices and computing devices that include optical devices. Such examples are non-limiting, and the scope of the appended claims should not be limited to the particular examples disclosed. In the following discussion, the terms "example" and "for example" are non-limiting.

[0007]

[0013] The figures show general schemes of construction, and descriptions and details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the present disclosure. Additionally, elements in the drawing figures are not necessarily drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve understanding of the examples discussed in this disclosure. The same reference numbers in different figures represent the same elements.

[0008]

[0014] The term "and / or" means any one or more of the items in the list joined by "and / or." As an example, "x and / or y" means any elements of the three-element set {(x),(y),(x,y)}. As another example, "x, y, and / or z" means any elements of the seven-element set {(x),(y),(z),(x,y),(x,z),(y,z),(x,y,z)}.

[0009]

[0015] The terms "comprising," "includes," and / or "including" are open-ended terms that specify the presence of stated features but do not exclude the presence or addition of one or more other features.

[0010]

[0016] Terms such as "first," "second," and the like may be used herein to describe various elements, and these elements should not be limited by these terms. These terms are used only to distinguish one element from another. Thus, for example, a first element discussed in this disclosure may be referred to as a second element without departing from the teachings of the disclosure.

[0011]

[0017] Unless otherwise specified, the term "coupled" may be used to describe two elements that are in direct contact with each other, or two elements that are indirectly connected by one or more other elements. For example, if element A is coupled to element B, element A may be in direct contact with element B, or may be indirectly connected to element B by an intervening element C. Similarly, the terms "over" or "on" may be used to describe two elements that are in direct contact with each other, or two elements that are indirectly connected by one or more other elements.

[0012]

[0018] In general, aspects of the present disclosure are directed to optical devices that may eliminate or reduce the need for bevels and / or notches used to accommodate conventional optical devices. In various embodiments, the optical device may include a transmitter and a receiver located behind a display screen of a computing device. Additionally, the optical device may include a guide (e.g., a waveguide, a light guide, etc.) that transmits or guides received light to a receiver located behind the display screen. Similarly, the same guide, another guide, and / or portions of the same guide may transmit or guide light generated by a transmitter located behind the screen.

[0013]

[0019] 1, a block diagram of a computing device 100 is shown that includes a display system 160 that includes a display screen 130 and a light device 140. As described in more detail below, aspects of the light device 140 may be positioned behind and / or integrated with the display screen 130. Such a positioning and / or integration may increase the usable display area of ​​the display screen 130.

[0014]

[0020] As shown, computing device 100 may include one or more processors 110, one or more storage devices 120, a display screen 130, an optical device 140, and various input / output (I / O) devices 150. Computing device 100 may further include a bus and / or other interconnections operatively coupling processor 110, storage device 120, display screen 130, optical device 140, and I / O device 150 to one another. Processor 110 may be configured to execute instructions, manipulate data as a result of executing such instructions, and control the operation of other components of computing device 100. To this end, processor 110 may include general-purpose processors, such as, for example, x86 processors, ARM processors, etc., available from various vendors. However, processor 110 may also be implemented using application-specific processors and / or other analog and / or digital logic circuitry.

[0015]

[0021] Storage device(s) 120 may include one or more volatile storage devices and / or one or more non-volatile storage devices. In general, storage device(s) 120 may store software and / or firmware instructions, which may be executed by processor(s) 110. Storage device(s) 120 may further store various types of data that processor(s) 110 may access, modify, and / or manipulate in response to executing instructions. To this end, storage device(s) 120 may include random access memory (RAM) devices, read-only memory (ROM) devices, solid-state drive (SSD) drives, flash memory devices, etc. In some embodiments, one or more of storage device(s) 120 may be integrated with one or more processor(s) 110.

[0016]

[0022] Display screen 130 may include one or more display screen layers configured to present images and / or other visual output through a front surface of the layers. Specifically, display screen 130 may present such images in response to instructions executed by processor 110. To this end, display screen 130 may include one or more liquid crystal display (LCD) layers, liquid-crystal on silicon (LCoS) layers, light-emitting diode (LED) layers, organic light-emitting diode (OLED) layers, quantum dot layers, interferometric modulator layers, or other display screen layers.

[0017]

[0023] As described in more detail below, light device 140 may include optical elements, such as transmitters and / or receivers, that emit and / or receive light. Computing device 100 may use the transmission and / or reception of light to generate data as part of a facial recognition process, a biometric authentication process, an augmented reality process, an autofocus process, and / or other process. In particular, processor 110 may execute instructions of an operating system, a device driver, an application, and / or some other software and / or firmware module, and control signals are generated that regulate the operation of light device 140 and its optical elements.

[0018]

[0024] Other I / O devices 150 may provide devices that allow a user or another device (e.g., another computing device, a networking device, etc.) to interact with computing device 100. For example, I / O devices 150 may include buttons, a touchscreen, a keyboard, a microphone, an audio speaker, etc., through which a person may interact with computing device 100. I / O devices 150 may also include network interfaces that allow computing device 100 to communicate with other computing and / or networking devices. To this end, the networking interfaces may include a wired networking interface such as an Ethernet (IEEE 802.3) interface, a wireless networking interface such as a WiFi (IEEE 802.11) interface, a Bluetooth (IEEE 802.15.1) interface, a wireless or mobile interface such as a cellular interface (GSM, CDMA, LTE, etc.), and / or any other type of networking interface that can provide a communications link between computing device 100 and another computing and / or networking device.

[0019]

[0025] The above describes aspects of computing device 100. However, there may be significant variations in the actual implementation of computing device 100. For example, a smartphone implementation of computing device 100 may use very different components and have a very different architecture than a laptop implementation of computing device 100. Despite such differences, computing devices nevertheless generally include a processor that executes software and / or firmware instructions to implement various functions. Accordingly, the foregoing aspects of computing device 100 are presented in an illustrative rather than a limiting sense.

[0020]

[0026] Some aspects of the present disclosure may be particularly useful for computing devices implemented as mobile consumer electronic devices (e.g., smartphones, tablets, laptops, etc.). However, the present disclosure contemplates that aspects will find utility across a vast array of different computing devices and / or computing platforms, and is not intended to limit the scope of the present disclosure to any particular computing device and / or computing platform beyond any limitations that may be found in the appended claims.

[0021]

[0027] 2A and 2B, there is shown a display screen layer 200 and a light device 300. Specifically, FIG. 2A shows a side view of the display screen layer 200 and the light device 300, and FIG. 2B shows a top view of the display screen layer 200 and the light device 300. The light device 300 may correspond to the light device 140 of FIG. 1.

[0022]

[0028] The display screen layer 200 may include a front surface, a back surface, and sidewalls between the front surface and the back surface. The display screen layer 200 may correspond to one or more layers of the display screen 130 and may present a visual output through its front surface. For example, the display screen layer 200 may correspond to an OLED display layer, an LED display layer, a μLED display layer, an LCOS display layer, or another display layer of the display screen 130.

[0023]

[0029] As shown, the optical device 300 may include optical elements such as a transmitter 310, a coupling region 320, an optical coupler 330, a front upper guide 340, and optical couplers 350, 360, and 370. The transmitter 310 may be disposed below or behind the rear surface of the display screen layer 200. Furthermore, the transmitter 310 may be aligned with the coupling region 320 and the optical coupler 330. In various embodiments, the optical device 300 may include multiple transmitters 310.

[0024]

[0030] Multiple transmitters 310 may use the same optical layer or portions of the same optical layer from the front upper guide 340 to direct the beams 311 to their respective optical combiners 350, 360, 370. In some embodiments, the optical device 300 may include separate optical layers for at least some of the transmitters 310.

[0025]

[0031] Bonding region 320 may be located along a sidewall of display screen layer 200, although other locations are possible. For example, bonding region 320 may be located such that bonding region 320 penetrates display screen layer 200 rather than simply along an exterior sidewall of display screen layer 200. In general, bonding region 320 may include an optically transparent material that allows passage of beam 311 from a rear surface of bonding region 320 to a front surface of bonding region 320. The rear surface of bonding region 320 may be flush with the rear surface of display screen layer 200, and the front surface of bonding region 320 may be flush with the front surface of display screen layer 200. In various embodiments, bonding region 320 may be integrated with display screen layer 200 or display screen 130 of computing device 100.

[0026]

[0032] Upper guide 340 may comprise optical layers over coupling region 320 and the front surface of display screen layer 200. Specifically, upper guide 340 may comprise one or more material layers, dielectric layers, coatings, etc. that extend at least partially along display screen layer 200 and cooperate to direct beam 311 from transmitter 310 toward optical couplers 350, 360, 370. Additionally, the front and back surfaces of upper guide 340 may be implemented to achieve total internal reflection (TIR), which confines beam 311 within upper guide 340 and directs it between optical coupler 330 and optical couplers 350, 360, 370. In various embodiments, the thickness of one or more optical layers of upper guide 340 may be defined such that upper guide 340 supports propagation of a discrete set of modes or a continuum of modes. Additionally, in this and subsequent embodiments, the upper guide 340 and / or the lower guide 342 (see, for example, FIG. 5A) may be separated from the display screen layer 200 by an air gap, which may promote better containment via TIR.

[0027]

[0033] The optical coupler 330 may be formed on the back surface of the upper guide 340 and disposed above the coupling region 320. The optical coupler 330 may be constructed to allow the beam 311 emitted by the transmitter 310 to enter the back surface of the upper guide 340 through the coupling region 320.

[0028]

[0034] The optical couplers 350, 360, 370 may comprise gratings and / or other structures that allow the beam 311 to escape from the front surface of the upper guide 340. The optical couplers 350, 360, 370 may be designed to have different outcoupling efficiencies to improve the spatial uniformity of the illumination of the optical device 300. For clarity, FIGS. 2A and 2B show a single beam 311 generated by the transmitter 310. However, in various embodiments, the transmitter 320 may generate several beams within a fixed field of view (FOV).

[0029]

[0035] The optical device 300 may achieve optical transport by coupling the beam 311 from the transmitter 310 into the back surface of the upper guide 340 via the optical coupler 330, propagating the confined beam 311 within the upper guide 340 using total internal reflection (TIR) ​​and / or reflective layer coatings on the upper guide 340, and emitting the beam 311 from the front surface of the upper guide 340 via one or more of the optical couplers 350, 360, and 370. The optical couplers 330 and / or the optical couplers 350, 360, and 370 may be prismatic couplers, diffractive couplers, metasurface couplers, or other types of couplers known in the art. The couplers 330, 350, 360, and 370 may be embedded within one or more layers of the upper guide 340, etched into one or more layers of the upper guide 340, or mounted on the front, back, or sidewalls of the upper guide 340. Thus, the upper guide 340 may provide for out-coupling of the beam 311 from the front surface (as shown) or the side wall of the upper guide 340. The optical couplers 350, 360, 370 may be designed to have multiple out-coupling or un-coupling regions. Multiple out-coupling or un-coupling regions may be useful, for example, to extend the spatial extent of the out-coupling area by out-coupling light for several light bounces within the upper guide 340.

[0030]

[0036] The upper guide 340 may transport light to areas of the display screen 130 that may be optimal and / or preferred from a sensing standpoint. Such areas may be unavailable to conventional optical devices because the receivers and / or transmitters of such optical devices would interfere with viewing the image output of the display screen layer 200. However, the couplers 350, 360, 370 may be designed to minimize interference with the image output of the display screen layer 200, and the transmitter 310 may be placed in a location (e.g., behind the display screen layer 200) that does not interfere with the image output. For example, by choosing an appropriate grating pitch and / or reducing the refractive index contrast of the couplers 350, 360, 370, the couplers 350, 360, 370 may be placed on the display screen layer 200 without interfering or appreciably interfering with the image output. Furthermore, the sensing wavelength may be chosen to be shorter or longer than the wavelength range for visible light. The couplers 350, 360, 362, 370 may extend to cover most of the upper guide 340 and / or display screen layer 200, or may be restricted to discrete areas of the upper guide 340 and / or display screen layer 200 as shown.

[0031]

[0037] The combiners 330, 350, 360, and 370 may incorporate beam-shaping and / or aberration correction functions in addition to the combining function. For example, one or more of the combiners 330, 350, 360, and 370 may be implemented as grating combiners with curved grooves and / or variable spacing. One or more of the combiners 330, 350, 360, and 370 may also incorporate beam-splitting functions. One or more of the combiners 330, 350, 360, and 370 may also provide polarization functions, such as linear polarizers or wave plates. Such beam-shaping, polarization, and / or other optical functions may be provided by one or more metasurfaces of the combiners 330, 350, 360, and 370 and / or the upper guide 340. In some embodiments, optical elements may be incorporated within the upper guide 340. Such optical elements may provide beam-shaping, polarization, and / or other optical functions.

[0032]

[0038] If optical coupler 330 and optical couplers 350, 360, and 370 are implemented as grating couplers with the same period, the resulting signal emitted by optical device 300 should experience little or no distortion due to grating dispersion. However, if the period of optical coupler 330 differs from the periods of optical couplers 350, 360, and 370, the resulting signal emitted by optical device 300 may experience image distortion due to mismatched dispersion of optical coupler 330 and optical couplers 350, 360, and 370. Similarly, if optical coupler 330 is implemented as a prism coupler and optical couplers 350, 360, and 370 are implemented as grating couplers, or vice versa, the resulting signal emitted by optical device 300 may experience image distortion due to mismatched dispersion of optical coupler 330 and optical couplers 350, 360, and 370. Accordingly, optical device 300 may include other elements, such as optical elements embedded within upper guide 340, that compensate for such distortions. Alternatively and / or additionally, computing device 100 may include software, and processor 110 may execute the software, to compensate for such distortions.

[0033]

[0039] Furthermore, as light propagates within the upper guide 340, the light may be allowed to expand or remain collimated within the upper guide 340. Beam expansion may increase the spatial extent of the signal emitted by the optical device 300. The increased spatial extent may improve the 3D sensing resolution of the optical device 300. Furthermore, expanding the beam 311 may reduce the energy per area of ​​the expanded beam 311 and improve the eye safety of the emitted beam 311. Thus, the total radiant power of the expanded beam 311 may be improved compared to a non-expanded beam while maintaining the same eye safety threshold and improving the 3D sensing range of the optical device 300.

[0034]

[0040] For the transmitter 310 implemented as a dot projector, an important parameter is the distance between the light source aperture of the transmitter 210 and the collimating or focusing lens. The longer the distance, the narrower the angular range of the dot. However, the collimating function can be incorporated into the optical combiners 350, 360, 370. Thus, the distance between the light source aperture of the transmitter 310 and the collimating function can be increased. This can result in a dramatic reduction in the angular dot size compared to current approaches, improving the 3D sensing resolution of the optical device 300.

[0035]

[0041] 3A and 3B, there is shown a display screen layer 200 and a light device 400. Specifically, FIG. 3A shows a side view of the display screen layer 200 and the light device 400, and FIG. 3B shows a top view of the display screen layer 200 and the light device 400. The display screen layer 200 may correspond to one or more layers of the display screen 130, and the light device 400 may correspond to the light device 140 of FIG. 1.

[0036]

[0042] As shown, the optical device 400 may include one or more optical elements, such as receivers 312, 314, a coupling region 322, an optical coupler 332, an upper guide 340, and optical couplers 352, 362. The receivers 312, 314 may be disposed below or behind the back surface of the display screen layer 200. Furthermore, the receivers 312, 314 may be aligned with the coupling region 322 and the optical couplers 332, 333.

[0037]

[0043] Bonding region 322 may be located along a sidewall of display screen layer 200, although other locations are possible. In general, bonding region 322 may comprise an optically transparent material that allows passage of beams 313, 315 from a front surface of bonding region 322 to a rear surface of bonding region 322. The rear surface of bonding region 322 may be flush with the rear surface of display screen layer 200, and the front surface of bonding region 322 may be flush with the front surface of display screen layer 200. In various embodiments, bonding region 322 may be integrated with display screen layer 200 or display screen 130 of computing device 100. In general, upper guide 340 may be implemented similarly to upper guide 340 of FIGS. 2A and 2B .

[0038]

[0044] The optical device 400 may achieve light transport by coupling the beams 313, 315 into the upper guide 340 via optical couplers 352, 362, propagating the confined beams 313, 315 within the upper guide 340 using total internal reflection (TIR) ​​and / or reflective layer coatings on the upper guide 340, coupling the beams 313, 315 from the upper guide 340 via optical couplers 332, 333 to a coupling region 322, and propagating the beams 313, 315 through the coupling region 322 to the receivers 312, 314. Specifically, the upper guide 340 may transport light from regions of the display screen 130 that may be optimal and / or preferred from a sensing standpoint. Such regions may have been unavailable to conventional optical devices because the receivers and / or transmitters of such optical devices would interfere with viewing the image output of the display screen layer 200. However, combiners 352, 362 may be designed to minimize interference with the image output of display screen layer 200, and transmitter 310 may be located in a location that does not interfere with the image output (e.g., behind display screen layer 200). Thus, combiners 352, 362 may be implemented similarly to combiners 350, 360, 370 of Figures 2A and 2B. Similarly, combiner 332 may be implemented similarly to combiner 330 of Figures 2A and 2B.

[0039]

[0045] 4A and 4B, there is shown a display screen layer 200 and a light device 500. Specifically, FIG. 4A shows a side view of the display screen layer 200 and the light device 500, and FIG. 4B shows a top view of the display screen layer 200 and the light device 500. The display screen layer 200 may correspond to one or more layers of the display screen 130, and the light device 500 may correspond to the light device 140 of FIG. 1.

[0040]

[0046] As shown, the optical device 500 may include a transmitter 310, a first coupling region 321, a second coupling region 324, mirrors 325, 326, 327, an upper guide 340, and optical couplers 350, 360. The transmitter 310 may be positioned below or behind the back surface of the display screen layer 200. Furthermore, the transmitter 310 may be aligned with the first coupling region 321.

[0041]

[0047] The first coupling region 321 may be located along a sidewall of the display screen layer 200, although other locations are possible. In general, the first coupling region 321 may comprise a first mirror 325, a second mirror 326, and an optically transparent material that allows the beam 311 to pass through. Specifically, the first mirror 325 and the second mirror 326 may be positioned and angled to receive the beam 311 from a rear surface of the first coupling region 321 and direct the beam 311 around the sidewall of the display screen layer 200. To this end, the first mirror 325 and the second mirror 326 may be positioned beyond the sidewall of the display screen layer 200. The first mirror 325 may be angled to direct the beam 311 from the transmitter 310 towards the second mirror 327. The second mirror 326 may be angled to direct the beam 311 towards the second coupling region 324. Mirrors 325, 326, as well as mirror 327 described below, can be metallic reflectors, dielectric reflectors, or based on total internal reflection.

[0042]

[0048] The back surface of first bonding area 321 may be flush with the back surface of display screen layer 200, and the front surface of first bonding area 321 may be flush with the front surface of display screen layer 200. In various embodiments, first bonding area 321 may be integrated with display screen layer 200 or display screen 130 of computing device 100.

[0043]

[0049] The second coupling region 324 may comprise a third mirror 327 and an optically transparent material that allows the beam 311 to pass through. Specifically, the third mirror 327 may be positioned and angled to receive the beam 311 from the back surface of the second coupling region 324, direct the beam 311 toward the upper guide 340 through a sidewall of the upper guide 340, and incouple the beam 311 into the upper guide 340. To this end, the third mirror 327 may be positioned above the second mirror 326 of the first coupling region 321 and beyond the sidewall of the upper guide 340. The third mirror 327 may be angled to direct the beam 311 received from the second mirror 326 through the back surface of the second coupling region 324 toward the sidewall of the upper guide 340.

[0044]

[0050] Second bonding region 324 may be disposed above first bonding region 321. Specifically, the back surface of second bonding region 324 may be disposed above the front surface of first bonding region 321. Furthermore, the back surface of second bonding region 324 may be flush with the front surface of display screen layer 200. In various embodiments, second bonding region 324 may be integrated with display screen layer 200 or display screen 130 of computing device 100.

[0045]

[0051] In general, the transmitter 310, couplers 330, 350, 360, and upper guide 340 of the optical device 500 may be implemented similarly to the transmitter 310, couplers 330, 350, 360, and upper guide 340 of the optical device 300 shown in Figures 2A and 2B. However, the coupling regions 321, 324 direct the beam 311 so that it enters the upper guide 340 through a sidewall of the upper guide 340, rather than through the back surface of the upper guide 340 as shown in Figure 2A.

[0046]

[0052] In accordance with the above, the optical device 500 may achieve optical transport by coupling the beam 311 into the upper guide 340 through the coupling regions 321, 324 and the sidewalls of the upper guide 340, propagating the confined beam 311 within the upper guide 340 using total internal reflection (TIR) ​​and / or reflective layer coatings of the upper guide 340, and emitting the beam 311 from the upper guide 340 via the optical couplers 350, 360. Specifically, the upper guide 340 may emit the beam 311 from a region of the display screen 130 that may be optimal and / or preferred from a sensing standpoint. Such a region may have been unavailable to conventional optical devices because the receivers and / or transmitters of such optical devices would interfere with viewing the image output of the display screen layer 200. However, the combiners 350, 360 may be designed to minimize interference with the image output of the display screen layer 200, and the transmitter 310 may be placed in a location (e.g., behind the display screen layer 200) that does not interfere with the image output.

[0047]

[0053] 5A and 5B, there is shown a display screen layer 200 and a light device 600. Specifically, FIG. 5A shows a side view of the display screen layer 200 and the light device 600, and FIG. 5B shows a top view of the display screen layer 200 and the light device 600. The display screen layer 200 may correspond to one or more layers of the display screen 130, and the light device 600 may correspond to the light device 140 of FIG. 1.

[0048]

[0054] As shown, the optical device 600 may include a transmitter 310, coupling regions 323, 328, optical couplers 330, 331, guides 340, 342, optical couplers 351, 355, and a cover layer 390. The transmitter 310 may be positioned below and behind the back surface of the display screen layer 200. Additionally, the transmitter 310 may be positioned below and behind the back surface of the lower guide 342.

[0049]

[0055] The upper guide 340 and the lower guide 342 may be implemented similarly to the upper guide 340 of FIG. 2A . However, the lower guide 342 may include an optical layer above the first coupling region 323 and behind the display screen layer 200. Specifically, the lower guide 342 may include one or more material layers, dielectric layers, coatings, etc. that extend along at least a portion of the display screen layer 200 and cooperate to direct the beam 311 from the transmitter 310 toward the coupling region 329. Additionally, the front and back surfaces of the lower guide 342 may be implemented to achieve total internal reflection (TIR), which confines the beam 311 within the lower guide 342 and directs the confined beam 311 between the optical coupler 331 and the optical coupler 355. In various embodiments, the thickness of one or more optical layers of the lower guide 342 may be defined such that the lower guide 342 supports propagation of a discrete set of modes or a continuum of modes. The lower guide 342 can be useful when, for various reasons, it is not possible to mount the transmitter 310 close to the side wall of the display screen layer 200 .

[0050]

[0056] 2A , but may be located below the lower guide 342. Specifically, the first bonding region 323 may be located between the rear surface of the lower guide 342 and the transmitter 310, and behind the display screen layer 200, although other locations are possible. In general, the first bonding region 323 may comprise an optically transparent material that allows the beam 311 received through the rear surface of the first bonding region 323 to pass to the front surface of the first bonding region 323.

[0051]

[0057] The second bonding region 328 may be implemented similarly to the bonding region 320 of FIG. 2A . Specifically, the second bonding region 328 may be disposed along a sidewall of the display screen layer 200, although other locations are possible. In general, the second bonding region 328 may comprise an optically transparent material that allows passage of the beam 311 from the rear surface of the second bonding region 328 to the front surface of the second bonding region 329. The rear surface of the second bonding region 328 may be flush with the rear surface of the display screen layer 200, and the front surface of the second bonding region 328 may be flush with the front surface of the display screen layer 200. In various embodiments, the second bonding region 328 may be integrated with the display screen layer 200 or the display screen 130 of the computing device 100.

[0052]

[0058] The couplers 331, 355 may be formed on the back surface of the lower guide 342. Specifically, the optical coupler 331 may be disposed above the first coupling region 323, and the optical coupler 355 may be disposed below the second coupling region 328. The optical coupler 331 may be constructed to allow the beam 311 emitted by the transmitter 310 to enter the back surface of the lower guide 342 via the first coupling region 323. Conversely, the optical coupler 355 may be constructed to allow the beam 311 to exit the front surface of the lower guide 342 via the second coupling region 328.

[0053]

[0059] The cover layer 390 may comprise a layer of transparent material that covers the upper guide 340. The cover layer 390 may protect the optical coupler 351 from contamination. Additionally, the cover layer 390 may increase the reflectivity of the interface between the upper guide 340 and the external environment (e.g., air) in which the optical device 600 operates.

[0054]

[0060] In general, the transmitter 310, couplers 330, 331, 351, 355, and guides 340, 342 of the optical device 600 may be implemented similarly to the transmitter 310, couplers 330, 350, 360, and upper guide 340 of FIGS. 2A and 2B. Specifically, the optical coupler 351 may be implemented as a continuous region that may cover most or all of the display screen layer 200. The optical coupler 351 may include output areas 353, 363, 373 where the beam 311 escapes the upper guide 340. Furthermore, the optical coupler 351 and its output areas 353, 363, 373 may be designed to generate a continuous stitched output. The optical couplers of other disclosed optical devices (e.g., the couplers 350, 360, 370 of the optical device 300) may similarly be implemented as a continuous region that covers most or all of the display screen layer 200.

[0055]

[0061] According to the above, the optical device 600 may achieve optical transport by coupling the beam 311 into the lower guide 342 via the first coupling region 323 and the optical coupler 331, propagating the confined beam 311 within the lower guide 342 using total internal reflection (TIR) ​​and / or reflective layer coatings within the lower guide 342, coupling the beam 311 into the second coupling region 328 via the optical coupler 355, coupling the beam 311 into the upper guide 340 via the second coupling region 328 and the optical coupler 330, propagating the confined beam 311 within the upper guide 340, and emitting the beam 311 from the upper guide 340 via the optical coupler 351 and its output areas 353, 363, 373.

[0056]

[0062] 5A, transmitter 310 is shown as emitting beam 311 having three rays. Such rays are also shown in coupling regions 323, 328, and lower guide 342. Further, such rays are shown exiting upper guide 340 via output areas 353, 363, and 373 of optical combiner 351. Such rays generally represent the initial illumination field from transmitter 310 and further illustrate that optical device 600 may be implemented to preserve the illumination field as beam 311 exits upper guide 340.

[0057]

[0063] To this end, couplers 331 and 355 may be implemented as grating couplers or metasurface couplers with variable line spacing. Couplers 331 and 355 may introduce focusing, collimating, or other optical power functions so that the angular range emitted from transmitter 310 appears as a set of rays with different divergences. The grating profiles of couplers 331 and 355 may be curved to provide optical functions in orthogonal directions. Specifically, coupler 331 may generate a set of parallel rays, and coupler 355 may have an inverse variable line spacing, so that after passing through both couplers 331 and 355, beam 311 forms a cone of light with zero total angular dispersion relative to the grating. Furthermore, the focusing function of couplers 331 and 355 may help reduce the lateral dimensions of second coupling region 328 at the sidewalls of display screen layer 200. As a result of reducing or minimizing the lateral dimensions of the second bonding region 328, the opening in the display screen layer 200 for accommodating the light device 600 may be reduced and / or the lateral dimensions of the display screen layer 200 may be increased.

[0058]

[0064] 6A and 6B, there is shown a display screen layer 200 and a light device 700. Specifically, FIG. 6A shows a side view of the display screen layer 200 and the light device 700, and FIG. 6B shows a top view of the display screen layer 200 and the light device 700. The display screen layer 200 may correspond to one or more layers of the display screen 130, and the light device 700 may correspond to the light device 140 of FIG. 1.

[0059]

[0065] 3A and 3B. However, unlike optical device 400, optical device 700 includes a multiband stack 352S. Specifically, optical device 700 may include one or more receivers 312, a coupling region 322, one or more multiband stacks 332S, an upper guide 340, and a multiband stack 352S. The one or more receivers 312 may be disposed below or behind the back surface of display screen layer 200. Furthermore, the one or more receivers 312 may be aligned with the coupling region 322 and the multiband stack 332S.

[0060]

[0066] Bonding region 322 may be located on a sidewall of display screen layer 200, although other locations are possible. In general, bonding region 322 may comprise an optically transparent material that allows passage of beam 315 from a front surface of bonding region 322 to a back surface of bonding region 322. The back surface of bonding region 322 may be flush with the back surface of display screen layer 200, and the front surface of bonding region 322 may be flush with the front surface of display screen layer 200. In various embodiments, bonding region 322 may be integrated with display screen layer 200 or display screen 130 of computing device 100. In general, upper guide 340 may be implemented similarly to upper guide 340 of FIG. 3A .

[0061]

[0067] The optical device 700 may achieve light transport by coupling the beam 315 into the upper guide 340 via optical couplers 352R, 352B, 352G of the multi-band stack 352S, propagating the confined beam 315 within the upper guide 340 using total internal reflection (TIR) ​​and / or reflective layer coatings of the upper guide 340, and emitting the beam 315 from the upper guide 340 via optical couplers 332R, 332B, 332G of the multi-band stack 332S. Specifically, the upper guide 340 may transport light from an area of ​​the display screen 130 that may be optimal and / or preferred from a sensing standpoint.

[0062]

[0068] To this end, each optical coupler 332R, 332G, 332B and each optical coupler 352R, 352B, 352G may have a narrow passband within the overall operating band. Specifically, the first wavelength band (e.g., red) coupler 332R, 352R may be configured to pass the first wavelength band (e.g., red), the second wavelength band (e.g., green) coupler 332G, 352G may be configured to pass the second wavelength band (e.g., green), and the third wavelength band (e.g., blue) coupler 332B, 352B may be configured to pass the third wavelength band (e.g., blue). As shown, the waveband couplers 332R, 332G, 332B may be stacked such that the first waveband (e.g., red) coupler 352R is at the top of the multiband stack 332S, the third waveband (e.g., blue) coupler 332B is at the bottom of the multiband stack 332S, and the second waveband (e.g., green) coupler 332G is at the center of the multiband stack 332S. Conversely, the waveband couplers 352R, 352G, 352B may be stacked such that the first waveband (e.g., red) coupler 352R is at the bottom of the multiband stack 352S, the third waveband (e.g., blue) coupler 352B is at the top of the multiband stack 352S, and the second waveband (e.g., green) coupler 352G is at the center of the multiband stack 352S.

[0063]

[0069] 6A, optical device 700 may support three different wavelength bands (e.g., red, green, and blue). However, optical device 700 may be implemented with any number of wavelength bands by using an appropriate number of wavelength band combiners in upper multiband stack 352S and a corresponding number of wavelength band combiners in lower multiband stack 332S.

[0064]

[0070] In an exemplary embodiment of the optical device 700, the upper guide 340 comprises a high-index glass and a front interface with the external environment (e.g., air). The input angle of the beam 315 may be normal or near normal to the front surface of the upper guide 340. The grating coupler period for the first wavelength band (e.g., red) couplers 332R, 352R may be 349 nm to appropriately couple a first wavelength band (e.g., red) of the beam 315 centered at 530 nm. The grating coupler period for the second wavelength band (e.g., green) couplers 332G, 352G may be 300 nm to appropriately couple a second wavelength band (e.g., green) of the beam 315 centered at 530 nm. The grating coupler period for the third wavelength band (e.g., blue) couplers 332B, 352B may be 263 nm to appropriately couple a third wavelength band (e.g., blue) of the beam 315 centered at 465 nm.

[0065]

[0071] Based on the above configuration, each of the waveband couplers 352R, 352G, 352B may couple a respective waveband (e.g., red, blue, green) of the beam 315 into the upper guide 340 at approximately 62° to the vertical. Maintaining the same coupling angle may be desirable to avoid walk-off of the beam 315, especially when using a single receiver 312. The selected grating parameters of the waveband couplers 352R, 352G, 352B may enable the passage of each waveband without diffraction, i.e., the first waveband (e.g., red) and the second waveband (e.g., green) pass through the third waveband (e.g., blue) coupler 352B without diffraction, and the first waveband (e.g., red) passes through the second waveband (e.g., green) coupler 352G without diffraction. However, the underlying waveband couplers 352R, 352G may still interact with (e.g., diffract) the wavebands after they have been deflected by their respective waveband couplers 332B, 332G. For example, the underlying first and second waveband (e.g., red and green) couplers 352R, 352G diffract the third waveband (e.g., blue) deflected by the third waveband (e.g., blue) coupler 352B. Such additional diffraction may be minimized by blazing the gratings of the waveband couplers 352R, 352G, 352B, such as by using holographic couplers, which may make the waveband couplers 352R, 352G, 352B selective to only certain combinations of wavelengths, input angles, and output angles.

[0066]

[0072] To avoid this additional diffraction, optical device 800 may include a separate guide for each wavelength band. Referring now to Figure 7, a side view of display screen layer 200 and optical device 800 is provided. Display screen layer 200 may correspond to one or more layers of display screen 130, and optical device 800 may correspond to optical device 140 of Figure 1.

[0067]

[0073] In general, the optical device 800 may be implemented similarly to the optical device 700 shown in Figures 6A and 6B. However, unlike the optical device 700, the optical device 800 comprises a first waveband (e.g., red) guide 340R for a first waveband (e.g., red), a second waveband (e.g., green) guide 340G for a second waveband (e.g., green), and a third waveband (e.g., blue) guide 340B for a third waveband (e.g., blue). Furthermore, the waveband couplers 332R, 332G, 332B may be laterally separated from one another. Such separation may prevent beams deflected by the respective waveband couplers 332B, 332G from being diffracted by the underlying waveband couplers 332G, 332R.

[0068]

[0074] Additionally, the optical device 800 may include a separate waveband receiver 312R, 312B, 312G, coupling region 322, waveband couplers 332R, 332G, 332B, waveband guides 340R, 340G, 340B, and waveband couplers 352R, 352G, 352B for each of the wavebands. The waveband receivers 312R, 312G, 312B may be positioned below or behind the back surface of the display screen layer 200. Additionally, the waveband receivers 312R, 312G, 312B may be aligned with the coupling region 322 and the respective waveband couplers 332R, 332G, 332B to receive the respective waveband beams 315R, 315G, 315B.

[0069]

[0075] The bonding region 322 may be located along a sidewall of the display screen layer 200, although other locations are possible. In general, the bonding region 322 may comprise an optically transparent material that allows passage of the waveband beams 315R, 315G, 315B between a front surface of the bonding region 322 and a back surface of the bonding region 322. The back surface of the bonding region 322 may be flush with the back surface of the display screen layer 200, and the front surface of the bonding region 322 may be flush with the front surface of the display screen layer 200. In various embodiments, the bonding region 322 may be integrated with the display screen layer 200 or the display screen 130 of the computing device 100.

[0070]

[0076] 3A 。 In general, each of the waveband guides 340R, 340G, 340B may be implemented similarly to the upper guide 340 of FIG. 3A . Specifically, a first waveband (e.g., red) guide 340R may be disposed above the coupling region 322 and the display screen layer 200. A second waveband (e.g., green) guide 340G may be disposed above the coupling region 322, the display screen layer 200, and the first waveband guide 340R. A third waveband (e.g., blue) guide 340B may be disposed above the coupling region 322, the display screen layer 200, the first waveband guide 340R, and the second waveband guide 340G.

[0071]

[0077] The optical device 700 couples a first waveband (e.g., red) beam 315R, a second waveband (e.g., green) beam 315G, and a third waveband (e.g., blue) beam 315B into a first waveband guide 340R, a second waveband guide 340G, and a third waveband guide 340B, respectively, via respective waveband couplers 352R, 352G, and 352B, and the respective waveband guides 340R, 340G, and 340B are coupled to the respective waveband guides 340R, 340G, and 340B. Light transport may be achieved by propagating the confined waveband beams 315R, 315G, 315B within the respective waveband guides 340R, 340G, 340B using total internal reflection (TIR) ​​and / or reflective layer coatings 332R, 332B, 332G and emitting the waveband beams 315R, 315G, 315B from the respective waveband guides 340R, 340G, 340B via waveband couplers 332R, 332B, 332G.

[0072]

[0078] To this end, each waveband coupler 332R, 332G, 332B and each waveband coupler 352R, 352B, 352G may have a narrow passband within the overall operating band. Specifically, the first waveband (e.g., red) coupler 332R, 352R may be configured to pass light within a first waveband (e.g., red), the second waveband (e.g., green) coupler 332G, 352G may be configured to pass light within a second waveband (e.g., green), and the third waveband (e.g., blue) coupler 332B, 352B may be configured to pass light within a third waveband (e.g., blue). Additionally, as shown, waveband couplers 332R, 332G, 332B may be offset from one another such that light from one waveband coupler (e.g., 332R or 332G) does not pass through the underlying waveband coupler (e.g., 332G or 332B). In this way, optical device 800 may avoid the additional diffraction introduced by waveband couplers 332G, 332B of optical device 700 shown in FIGS. 6A and 6B.

[0073]

[0079] The multi-band optical devices 700, 800 are shown as receiving external signals and sensing such external signals with one or more receivers. Multi-band optical devices that transmit signals may be similarly implemented. Specifically, a transmitter 310 may be added and the beam path reversed to emit the multi-band signal.

[0074]

[0080] Furthermore, optical devices 300, 400, 500, 600, 700, and 800 possess various described functions. Additional optical device embodiments may mix, match, and / or combine functions from optical devices 300, 400, 500, 600, 700, and 800. For example, optical devices 300 and 400 may be combined to form an optical device having both receiving and transmitting functions. Furthermore, combined embodiments may share common elements. For example, optical device 300 and optical device 400 may be combined to form an optical device having a single upper guide 340 used to direct beam 311 from transmitter 310 and beam 315 to receiver 312.

[0075]

[0081] While this disclosure includes reference to several examples, those skilled in the art will recognize that various changes may be made and equivalents may be substituted without departing from the scope of the disclosure. Furthermore, modifications may be made to the disclosed examples without departing from the scope of the disclosure. Accordingly, it is intended that the disclosure not be limited to the disclosed examples, but rather that the disclosure include all examples encompassed within the scope of the appended claims. [Explanation of symbols]

[0076] 100 computing devices 110 processors 120 Storage Devices 130 display screen 140 Optical Devices 150 Input / Output (I / O) devices 160 Display System 200 display screen layers 300 Optical Devices 310 Transmitter 312 Receiver 314 Receiver 320 Combined Area 321 Combined area 322 Combined area 323 Combined area 324 Combined Area 325 Mirror 326 Mirror 327 Mirror 328 Combined area 330 Optical coupler 331 Optical coupler 332 Optical coupler 332B Optical coupler 332G optical coupler 332R Optical coupler 332S Multi-Band Stack 333 Optical coupler 340 Guide 340B Waveband Guide 340G Waveband Guide 340R Waveband Guide 342 Guide 350 Optical coupler 351 Optical coupler 352 Optical coupler 352B Optical coupler 352G optical coupler 352R Optical coupler 352S Multi-Band Stack 353 Output Area 355 Optical coupler 360 optical coupler 362 Optical coupler 363 Output Area 370 Optical coupler 373 Output Area 390 Cover Layer 400 Optical Devices 500 Optical Devices 600 Optical Devices 700 Optical Devices

Claims

1. a display screen layer having a front surface, a back surface, and a sidewall between the front surface and the back surface, the display screen layer configured to present a visual output through the front surface; a bonding area through the display screen layer; an upper guide extending along at least a portion of the front surface of the display screen layer, the upper guide comprising a front surface, a back surface, and a sidewall between the front surface and the back surface; a first coupler along the front surface of the upper guide, the first coupler coupling a beam between an outside of the upper guide and an inside of the upper guide through the front surface of the upper guide; a second coupler between the coupling region and the upper guide, the second coupler coupling the beam between the coupling region and the upper guide; an optical element below the rear surface of the upper guide, wherein when viewed from a direction perpendicular to the rear surface of the upper guide, an area of ​​the optical element is included in an area of ​​the rear surface of the upper guide; A display system comprising: the upper guide is configured to direct the beam between the first coupler and the second coupler; The coupling region is configured to direct the beam between the optical element and the upper guide.

2. 10. The display system of claim 1, the first coupler is configured to couple the beam from an external environment into the upper guide through the front surface of the upper guide; the second coupler is configured to couple the beam from the upper guide to the coupling region; the optical element comprises a receiver configured to receive the beam through the coupling region. Display system.

3. 10. The display system of claim 1, a third coupler along the front surface of the upper guide Equipped with the first coupler is configured to couple the beam from an external environment into the upper guide through the front surface of the upper guide; the third coupler is configured to couple a second beam from the external environment into the upper guide through the front surface of the upper guide; the second coupler is configured to couple the beam and the second beam from the upper guide to the coupling region; the optical element comprises a first receiver configured to receive the beam from the combining region and a second receiver configured to receive the second beam from the combining region. Display system.

4. 10. The display system of claim 1, the optical element comprises a transmitter configured to direct the beam into the coupling region; the second coupler is configured to couple the beam from the coupling region to the upper guide; the first coupler is configured to emit the beam from the upper guide to an external environment through the front surface of the upper guide. Display system.

5. 5. The display system of claim 4, wherein the coupling region couples the beam to the upper guide through the back surface of the upper guide.

6. 5. The display system of claim 4, wherein the coupling region couples the beam to the upper guide through the sidewall of the upper guide.

7. 10. The display system of claim 1, a lower guide extending along at least a portion of the rear surface of the display screen layer; Equipped with the lower guide includes a front surface, a rear surface, and a sidewall between the front surface and the rear surface; the lower guide is configured to direct the beam between the coupling region and the optical element. Display system.

8. 10. The display system of claim 1, a first multiband stack along the front surface of the upper guide, the first multiband stack including the first coupler; a second multiband stack between the upper guide and the coupling region, the second multiband stack including the second coupler; A display system comprising:

9. 10. The display system of claim 1, a second upper guide extending along at least a portion of the front surface of the upper guide; a third coupler along the front surface of the second upper guide; and Equipped with the first coupler couples a first wavelength band of the beam through the front surface of the upper guide; the third coupler couples a second wavelength band of the beam through the front surface of the second upper guide. Display system.

10. 10. The display system of claim 1, a second upper guide extending along at least a portion of the front surface of the upper guide; a third coupler above the coupling region and laterally offset from the second coupler; Equipped with the second coupler couples a first wavelength band of the beam between the upper guide and the coupling region; the third coupler couples a second wavelength band of the beam between the second upper guide and the coupling region; Display system.

11. a display screen layer having a front surface, a back surface, and a sidewall between the front surface and the back surface; a storage device containing instructions; a processor configured to execute the instructions, execution of the instructions causing the processor to present a visual output through the front surface of the display screen layer; a bonding region along the sidewall of the display screen layer; an upper guide extending along at least a portion of the front surface of the display screen layer, the upper guide comprising a front surface, a back surface, and a sidewall between the front surface and the back surface; a first coupler along the front surface of the upper guide, the first coupler coupling a beam between an outside of the upper guide and an inside of the upper guide through the front surface of the upper guide; a second coupler between the coupling region and the upper guide, the second coupler coupling the beam between the coupling region and the upper guide; an optical element below the rear surface of the upper guide, wherein when viewed from a direction perpendicular to the rear surface of the upper guide, an area of ​​the optical element is included in an area of ​​the rear surface of the upper guide; 1. A computing device comprising: the upper guide is configured to direct the beam between the first coupler and the second coupler; the coupling region is configured to direct the beam between the optical element and the upper guide. Computing Devices

12. 12. The computing device of claim 11, the first coupler is configured to couple the beam from an external environment into the upper guide through the front surface of the upper guide; the second coupler is configured to couple the beam from the upper guide to the coupling region; the optical element comprises a receiver configured to receive the beam through the coupling region. Computing devices.

13. 12. The computing device of claim 11, a third coupler along the front surface of the upper guide; and a fourth coupler between the coupling region and the upper guide; Equipped with the first coupler is configured to couple the beam from an external environment into the upper guide through the front surface of the upper guide; the third coupler is configured to couple a second beam from the external environment into the upper guide through the front surface of the upper guide; the second coupler is configured to couple the beam from the upper guide to the coupling region; the fourth coupler is configured to couple the second beam from the upper guide to the coupling region; the optical element comprises a first receiver configured to receive the beam from the combining region and a second receiver configured to receive the second beam from the combining region. Computing devices.

14. 12. The computing device of claim 11, the optical element comprises a transmitter configured to direct the beam into the coupling region; the second coupler is configured to couple the beam from the coupling region to the upper guide; the first coupler is configured to emit the beam from the upper guide to an external environment through the front surface of the upper guide. Computing devices.

15. 15. The computing device of claim 14, wherein the coupling region couples the beam to the upper guide through the back surface of the upper guide.

16. 15. The computing device of claim 14, wherein the coupling region couples the beam to the upper guide through the sidewall of the upper guide.

17. 12. The computing device of claim 11, a lower guide extending along at least a portion of the rear surface of the display screen layer; Equipped with the lower guide includes a front surface, a rear surface, and a sidewall between the front surface and the rear surface; the lower guide is configured to direct the beam between the coupling region and the optical element. Computing devices.

18. 12. The computing device of claim 11, a first multiband stack along the front surface of the upper guide, the first multiband stack including the first coupler; a second multiband stack between the upper guide and the coupling region, the second multiband stack including the second coupler; 1. A computing device comprising:

19. 12. The computing device of claim 11, a second upper guide extending along at least a portion of the front surface of the upper guide; a third coupler along the front surface of the second upper guide; and Equipped with the first coupler couples a first wavelength band of the beam through the front surface of the upper guide; the third coupler couples a second wavelength band of the beam through the front surface of the second upper guide. Computing devices.

20. 12. The computing device of claim 11, a second upper guide extending along at least a portion of the front surface of the upper guide; a third coupler above the coupling region and laterally offset from the second coupler; Equipped with the second coupler couples a first wavelength band of the beam between the upper guide and the coupling region; the third coupler couples a second wavelength band of the beam between the second upper guide and the coupling region; Computing devices.

Images