# US 12,216,357 B2 · Display backplanes with integrated electronics, photonics and color conversion components > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,216,357 B2 - Document ID: US12216357B2 - Status: Granted - Kind: B2 - Application number: 18/464,338 - Filed: 2023-09-11 - Published: 2024-03-14 - Granted: 2025-02-04 - Earliest claimed: 2022-09-12 - Assignees: Meta Platforms Technologies, LLC - Applicants: Meta Platforms Technologies, LLC - Inventors: Zhimin Shi; Xi Wu; James Ronald Bonar; Yun Wang; Edward Buckley - Web page: https://patentgrep.com/patent/US12216357B2 ## CPC - G02B 6/0035: {provided on the surface of the light guide or in the bulk of it} - G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light} - G02B 6/0001: {specially adapted for lighting devices or systems (lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00)} - G02B 6/0026: {Wavelength selective element, sheet or layer, e.g. filter or grating} - G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract In some examples, an apparatus may include a backlight unit (BLU) including an electronic integrated circuit layer, a photonic integrated circuit layer, a color conversion module, and a display interface layer. In some examples, a BLU may include at least one laser or may be configured to receive laser light from at least one external laser source. Laser light may be transmitted towards a portion of the display interface layer using the photonic integrated circuit. Color conversion modules may be used to convert the laser light into one or more desired colors. Example apparatus may be used in head-mounted devices such as augmented reality and/or virtual reality devices. Other devices, methods, systems, and computer-readable media are also disclosed. ## Claims ### Claim 1 A device comprising: a photonic integrated circuit configured to transmit light of a first color; a pair of spaced-apart reflectors; a color conversion layer, located within an optical cavity defined by the pair of spaced-apart reflectors, configured to: receive the light of the first color from the photonic integrated circuit; and convert at least a portion of the light of the first color into light of a second color that is different from the first color; and a display configured to be illuminated by the light of the first color and the light of the second color. ### Claim 2 (depends on 1) The device of claim 1, wherein the light of the first color is blue light and the light of the second color is red light. ### Claim 3 (depends on 1) The device of claim 1, wherein the light of the first color is blue light and the light of the second color is green light or yellow light. ### Claim 4 (depends on 1) The device of claim 1, wherein: the photonic integrated circuit includes a waveguide having a light outcoupler configured to direct at least a portion of the light of the first color from the waveguide towards the color conversion layer. ### Claim 5 (depends on 4) The device of claim 4, wherein the light outcoupler comprises a grating. ### Claim 6 (depends on 4) The device of claim 4, wherein the light outcoupler comprises an arrangement of scattering particles. ### Claim 7 (depends on 1) The device of claim 1, wherein the photonic integrated circuit comprises: a light input port; and a dynamic light distribution module. ### Claim 8 (depends on 7) The device of claim 7, wherein the dynamic light distribution module includes at least on Mach-Zehnder interferometer. ### Claim 9 (depends on 8) The device of claim 8, wherein: the light input port is configured to receive light of the first color from a laser, the light of the first color including laser radiation from the laser. ### Claim 10 (depends on 8) The device of claim 8, wherein: the device comprises a laser configured to emit blue laser radiation; and the light of the first color is blue laser radiation. ### Claim 11 (depends on 1) The device of claim 1, wherein the spaced-apart reflectors comprise at least one of: one or more high reflectivity mirrors; and one or more partial reflectivity mirrors. ### Claim 12 (depends on 1) The device of claim 1, wherein the device includes a waveguide extending through the optical cavity. ### Claim 13 (depends on 1) The device of claim 1, wherein: the device further includes an electronic integrated circuit; and the color conversion layer is located between the electronic integrated circuit and the display. ### Claim 14 (depends on 13) The device of claim 13, wherein the electronic integrated circuit includes at least one of electronic bus lines for power distribution, control lines, data lines, or an electronic circuit configured for active pixel control of the display. ### Claim 15 (depends on 1) The device of claim 1, further comprising a display interface layer, wherein: the display interface layer includes at least one of an anti-reflection coating, an electrically conductive electrode, an alignment layer, electrodes, a polarizer, or a black matrix layer. ### Claim 16 (depends on 1) The device of claim 1, where the device is a head-mounted device. ### Claim 17 (depends on 1) The device of claim 1, where the device is an augmented reality device or a virtual reality device. ### Claim 18 A device comprising: a photonic integrated circuit; a display; an electronic integrated circuit; and a color conversion layer, located between the electronic integrated circuit and the display, wherein: the photonic integrated circuit is configured to receive ultraviolet (UV) light and transmit the UV light to the color conversion layer; the color conversion layer includes a plurality of color conversion modules; and the plurality of color conversion modules is configured to: convert at least a portion of the UV light into three colors of visible light; and illuminate the display using the three colors of visible light. ### Claim 19 (depends on 18) The device of claim 18, wherein the three colors of visible light include red light, green light, and blue light. ### Claim 20 A method of illuminating a display, comprising: transmitting a first light beam having a first wavelength along a waveguide out-coupling the first light beam from the waveguide into a color conversion module, located within an optical cavity defined by a pair of spaced-apart reflectors; using the color conversion module, generating a second light beam having a second wavelength different from the first wavelength; and illuminating a display using the first light beam and the second light beam.