公开(公告)号：US20200243616A1

公开(公告)日：2020-07-30

申请号：US16260940

申请日：2019-01-29

Applicant: Sharp Kabushiki Kaisha

Inventor： Edward Andrew Boardman ,  Enrico Angioni ,  Tim Michael Smeeton

IPC: H01L27/32 ,  H01L51/50 ,  H01L33/50

Abstract: A light-emitting device is configured to emit light in improved accordance with the Rec. 2020 specification. The light emitting device includes a substrate; a first electrode disposed on the substrate between an outer surface of the light emitting device and the substrate; a second electrode disposed between the first electrode and the outer surface; a first emissive layer in electrical contact with the first electrode and the second electrode, wherein the first emissive layer includes quantum dots that emit light when electrically excited, and wherein the first emissive layer is associated with a first peak wavelength, λ1; and a second emissive layer disposed between the first emissive layer and a viewing side of the light emitting device, wherein the second emissive layer is a photoluminescent layer that includes quantum dots that emit light when optically excited, and the second emissive layer is associated with a second peak wavelength, λ2, different from the first peak wavelength. The second emissive layer operates to convert a portion of light emitted by the first emissive layer from the first peak wavelength to the second peak wavelength, such that the resultant overall emission is in accordance with the Rec. 2020 specification.

公开(公告)号：US10600980B1

公开(公告)日：2020-03-24

申请号：US16223774

申请日：2018-12-18

Applicant: Sharp Kabushiki Kaisha

Inventor： Edward Andrew Boardman ,  David James Montgomery ,  Tim Michael Smeeton ,  James Andrew Robert Palles-Dimmock

IPC: H01L51/50 ,  H01L51/52 ,  H01L27/32

Abstract: A light-emitting device includes an emissive layer that emits light by recombination of first charges and second charges, a first electrode from which the first charges are supplied, a second electrode located on an opposite side of the emissive layer relative to the first electrode from which the second charges are supplied, and a charge transporting layer that is located between the emissive layer and the first electrode that injects the first charges from the first electrode into the emissive layer. The charge transporting layer includes a nanoparticle layer that provides a roughened electrode interface between the first electrode and the charge transporting layer and the emissive layer includes a plurality of quantum dots in electrical contact with the first electrode and the second electrode.

公开(公告)号：US10581007B2

公开(公告)日：2020-03-03

申请号：US15937073

申请日：2018-03-27

Applicant: Sharp Kabushiki Kaisha

Inventor： Enrico Angioni ,  James Andrew Robert Palles-Dimmock ,  Edward Andrew Boardman ,  Tim Michael Smeeton

IPC: H01L51/50 ,  H01L51/52 ,  H01L51/56 ,  H01L33/06 ,  B82Y20/00

Abstract: A light-emitting device includes an anode; a cathode; and an emissive layer disposed between the anode and the cathode, the emissive layer including quantum dots dispersed in a crosslinked matrix formed from one or more crosslinkable charge transport materials. A method of forming the emissive layer of a light-emitting device includes depositing a mixture including quantum dots and one or more crosslinkable charge transport materials on a layer; and subjecting at least a portion of the mixture to UV activation to form an emissive layer including quantum dots dispersed in a crosslinked matrix.

公开(公告)号：US20190304370A1

公开(公告)日：2019-10-03

申请号：US15937965

申请日：2018-03-28

Applicant: Sharp Kabushiki Kaisha

Inventor： Tong Lu ,  Michael James Brownlow ,  Tim Michael Smeeton

IPC: G09G3/3258

Abstract: A display system includes a display panel comprising a plurality of pixel circuits, and a measurement and data processing unit that is external to the display panel. Each pixel circuit includes a light-emitting device having a first terminal connected to a first voltage supply and a second terminal opposite from the first terminal; a first transistor connected between a data voltage supply line from the measurement and data processing unit and the second terminal of the light emitting device; and a second transistor connected between the second terminal of the light-emitting device and a sample line to the measurement and data processing unit. The measurement and data processing unit is configured to sample a measured voltage at the second terminal of the light-emitting device through the sample line and to output a data voltage to the light-emitting device based on the measured voltage to compensate variations in properties of the light-emitting device. Each pixel circuit further may include a storage capacitor connected between the second terminal of the light-emitting device and a second voltage supply, wherein the storage capacitor discharges through the light-emitting device when the data voltage is disconnected from the pixel circuit.

公开(公告)号：US20190295467A1

公开(公告)日：2019-09-26

申请号：US15933474

申请日：2018-03-23

Applicant: Sharp Kabushiki Kaisha

Inventor： Tong Lu ,  Christopher James Brown ,  Michael James Brownlow ,  Tim Michael Smeeton

IPC: G09G3/3233 ,  G09G3/3291

Abstract: A pixel circuit for a display device includes a drive transistor configured to control an amount of current to a light-emitting device during an emission phase depending upon a voltage applied to a gate of the drive transistor; a second transistor connected to the gate of the drive transistor, wherein the second transistor is in an on state during a combined programming and compensation phase and in an off state during the emission phase, and when the second transistor is in an on state the drive transistor becomes diode-connected such that a gate and a second terminal of the drive transistor are connected through the second transistor; a third transistor connected to the second terminal of the drive transistor, wherein the third transistor is in an on state during the combined programming and compensation phase to permit a reference current to be applied through the drive transistor, and is in an off state during the emission phase to remove the reference current; and a capacitor having a first plate that is connected to the gate of the drive transistor and a second plate that is connectable to a data voltage during the combined programming and compensation phase. A threshold voltage and/or a carrier mobility of the drive transistor is compensated by application of the reference current during the combined programming and compensation phase.

公开(公告)号：US10270218B2

公开(公告)日：2019-04-23

申请号：US15822297

申请日：2017-11-27

Applicant: Sharp Kabushiki Kaisha

Inventor： Karl Peter Welna ,  Edward Andrew Boardman ,  Tim Michael Smeeton ,  Valerie Berryman-Bousquet

IPC: H01S3/04 ,  H01S3/109 ,  H01S3/137 ,  H01S3/0941 ,  H01S5/022 ,  H01S5/024 ,  H01S3/08 ,  H01S5/00 ,  H01S5/14

Abstract: A laser device includes a light source that emits a source light having a first peak wavelength. A nonlinear optical component performs a frequency conversion process that converts the source light into output light having a second peak wavelength. A stabilization component minimizes a mismatch error constituting a difference between the first peak wavelength and a wavelength for which the frequency conversion process in the nonlinear optical component has a maximum value. The stabilization component may include a housing that is thermally conductive between the light source and the nonlinear optical component to minimize a temperature difference between the light source and the nonlinear optical component. The laser device may include a focusing optical component that focuses the source light to have a convergence half angle that is larger than a convergence half angle that gives maximum output power, thereby increasing an acceptable range of the mismatch error.

公开(公告)号：US10184890B2

公开(公告)日：2019-01-22

申请号：US15455473

申请日：2017-03-10

Applicant: Sharp Kabushiki Kaisha

Inventor： Jing Li ,  Jacob Thomas Barrett ,  Tim Michael Smeeton ,  Valerie Berryman-Bousquet

IPC: G01N21/61 ,  G01N21/05 ,  G01N33/497 ,  G01N21/33 ,  G01N21/03

Abstract: A gas analyzer and related methods are for measuring a concentration of a component of a gas mixture. The gas analyzer includes a gas cell defining an overall volume for housing the gas mixture, a gas inlet and a gas outlet, a light source that emits a light beam into the gas cell, and a light detector that detects a portion of the light of the light beam that has propagated through the gas mixture, the concentration of the component of the gas mixture being determined based on the portion of the light beam detected by the light detector. The gas cell defines an optical volume for travel of the light beam within the gas cell, and the optical volume comprises at least a portion of the overall volume and is configured to suppress turbulent flow of the gas mixture within the optical volume to reduce optical noise generated by the gas mixture.

公开(公告)号：US10012843B2

公开(公告)日：2018-07-03

申请号：US15208980

申请日：2016-07-13

Applicant: Sharp Kabushiki Kaisha

Inventor： Sarah Anne Mitchell ,  Tim Michael Smeeton ,  Noriaki Fujii ,  Valerie Berryman-Bousquet

IPC: G02B27/28 ,  G02B5/00 ,  G02B5/30 ,  G02F1/35

CPC classification number: G02B27/283 ,  G02B5/003 ,  G02B5/3066 ,  G02F1/353

Abstract: A light beam separating and absorbing element includes a mirror that receives first and second light beams incident on a first surface, and the mirror is configured to transmit the first light beam and reflect the second light beam. A beam absorber receives the first light beam transmitted through the mirror, and absorbs a first light portion of the transmitted first light beam after the first light beam has been transmitted through the mirror. The beam absorber scatters a second portion of the first light beam, and the beam absorber and mirror are positioned such that at least a portion of the scattered light is incident on a second surface of the mirror. Transmissivity of the mirror for the scattered light incident on the second mirror surface may be lower as compared to transmissivity for the first light beam incident on the first mirror surface to enhance separation of the first and second light beams.

公开(公告)号：US09985173B2

公开(公告)日：2018-05-29

申请号：US14487337

申请日：2014-09-16

Applicant: Sharp Kabushiki Kaisha

Inventor： Peter Neil Taylor ,  Jonathan Heffernan ,  Stewart Edward Hooper ,  Tim Michael Smeeton

IPC: H01L51/54 ,  H01L33/06 ,  C09K11/62 ,  H01L31/032 ,  C01B21/06 ,  C01B21/072 ,  H01L33/26

CPC classification number: H01L33/06 ,  C01B21/0615 ,  C01B21/0632 ,  C01B21/072 ,  C09K11/623 ,  H01L31/032 ,  H01L33/26 ,  Y02E10/549 ,  Y10S977/773

Abstract: The present application provides nitride semiconductor nanoparticles, for example nanocrystals, made from a new composition of matter in the form of a novel compound semiconductor family of the type group II-III-N, for example ZnGaN, ZnInN, ZnInGaN, ZnAlN, ZnAlGaN, ZnAlInN and ZnAlGaInN. This type of compound semiconductor nanocrystal is not previously known in the prior art. The invention also discloses II-N semiconductor nanocrystals, for example ZnN nanocrystals, which are a subgroup of the group II-III-N semiconductor nanocrystals. The composition and size of the new and novel II-III-N compound semiconductor nanocrystals can be controlled in order to tailor their band-gap and light emission properties. Efficient light emission in the ultraviolet-visible-infrared wavelength range is demonstrated. The products of this invention are useful as constituents of optoelectronic devices such as solar cells, light emitting diodes, laser diodes and as a light emitting phosphor material for LEDs and emissive EL displays.

公开(公告)号：US20180145477A1

公开(公告)日：2018-05-24

申请号：US15822297

申请日：2017-11-27

Applicant: Sharp Kabushiki Kaisha

Inventor： Karl Peter Welna ,  Edward Andrew Boardman ,  Tim Michael Smeeton ,  Valerie Berryman-Bousquet

IPC: H01S3/109 ,  H01S3/08 ,  H01S3/0941 ,  H01S3/137 ,  H01S3/04

CPC classification number: H01S3/109 ,  G02F1/353 ,  H01S3/0405 ,  H01S3/08009 ,  H01S3/0941 ,  H01S3/137 ,  H01S5/0071 ,  H01S5/0092 ,  H01S5/022 ,  H01S5/02438 ,  H01S5/02453 ,  H01S5/06837 ,  H01S5/0687 ,  H01S5/141

Abstract: A laser device includes a light source that emits a source light having a first peak wavelength. A nonlinear optical component performs a frequency conversion process that converts the source light into output light having a second peak wavelength. A stabilization component minimizes a mismatch error constituting a difference between the first peak wavelength and a wavelength for which the frequency conversion process in the nonlinear optical component has a maximum value. The stabilization component may include a housing that is thermally conductive between the light source and the nonlinear optical component to minimize a temperature difference between the light source and the nonlinear optical component. The laser device may include a focusing optical component that focuses the source light to have a convergence half angle that is larger than a convergence half angle that gives maximum output power, thereby increasing an acceptable range of the mismatch error.