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公开(公告)号：US11880114B2
公开(公告)日：2024-01-23
申请号：US17004530
申请日：2020-08-27
Inventor： Zhengnan Yuan , Abhishek Kumar Srivastava , Zhibo Sun , Hoi Sing Kwok
CPC classification number: G02F1/292 , G01S7/481 , G01S7/4814 , G01S7/4816 , G01S7/4817 , G01S17/02 , G01S17/89 , G02F1/141
Abstract: Techniques for using ferroelectric liquid crystals Dammann grating (FLCDG) for light detection and ranging devices are disclosed. In LiDAR devices, accuracy, response time, and cost performance can be limited by some factors, such as laser pulse width, time resolution of a time-to-digital conversion chip, detector bandwidth, shot noise, and time error generated by electronic circuits. A FLCDG-based architecture can improve a LiDAR device, and provide for one-shot capturing due to the high switching speed at very low driving voltage provided by ferroelectric liquid crystals and the equal diffracting ability of Dammann grating.
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2.发明申请公开(公告)号：US20190312175A1
公开(公告)日：2019-10-10
申请号：US16380598
申请日：2019-04-10
Inventor： Maksym F. Prodanov , Valerii Vladimirovich Vashchenko , Abhishek Kumar Srivastava , Hoi Sing Kwok
Abstract: A method for fabricating quantum rods includes: preparing a Cd-precursor; preparing a S-precursor and CdSe seeds; preparing a Zn-precursor; mixing the S-precursor and the CdSe seeds with the Cd-precursor in a reaction mixture; adding the Zn-precursor to the reaction mixture; stopping the reaction; and performing a purification process to obtain the quantum rods.
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公开(公告)号：US10381564B2
公开(公告)日：2019-08-13
申请号：US15753519
申请日：2016-08-17
Inventor： Hoi Sing Kwok , Guijun Li , Yeuk Lung Jacob Ho , Man Wong
Abstract: A method of fabricating a hybrid organic-inorganic halide perovskite film includes depositing a precursor layer onto a substrate, the precursor layer comprising metal halide, placing an organic source-material layer onto a boat, the organic source-material layer comprising an organic cation, and annealing the precursor layer and the organic source-material layer in a vacuum chamber enclosed in a constrained volume.
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公开(公告)号：US10032924B2
公开(公告)日：2018-07-24
申请号：US14671055
申请日：2015-03-27
Inventor： Lei Lu , Man Wong , Hoi Sing Kwok
IPC: H01L29/786 , H01L21/477 , H01L21/465 , H01L29/49 , H01L29/66 , H01L21/02
Abstract: An apparatus is provided that includes a substrate and source and drain regions within an annealed active layer having resulted from an annealing of an active layer comprising metal-oxide and formed on the substrate, and an impermeable layer over the source and drain regions of the annealed active layer, wherein the annealing resulting in the annealed active layer was performed with the impermeable layer over portions of the active layer corresponding to the source and drain regions, thereby resulting in a reduction of a resistivity of the source and drain regions of the annealed active layer relative to the active layer. In another aspect, a junctionless transistor is provided wherein the entire active area has a low resistivity based on annealing of an active layer including metal oxide while uncovered or at least partially covered with layers of various gas permeability under oxidizing or non-oxidizing conditions.
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公开(公告)号：US09383607B2
公开(公告)日：2016-07-05
申请号：US14553539
申请日：2014-11-25
Inventor： Tao Du , Vladimir Grigorievich Chigrinov , Hoi Sing Kwok
IPC: G01J4/00 , G02F1/1337 , G02B5/30 , G02B27/28 , G02F1/01 , G02F1/13 , G02F1/13363
CPC classification number: G02F1/133788 , G02B5/3016 , G02B5/3083 , G02B5/3091 , G02B27/286 , G02F1/0136 , G02F1/1313 , G02F2001/133638
Abstract: The present invention provides a patterned polarization converter having multiple domains that can be used to convert input linear polarized light to output light with spatially varying polarization states, including domains that produce linearly polarized light and domains that produce circular polarized light based on the patterning of the domains. A patterned polarization converter having multiple domains may be used in a polarization sensor application capable of detecting the polarization state of input light. The present invention further provides patterned radial and azimuthal polarization converters, which have utility in applications such as optical tweezers. Additionally, patterned polarization converters may be used to fabricate more patterned polarization converters having the same pattern using one-step photoalignment to copy the pattern of an existing patterned polarization converter to an unpatterned photoalignment layer.
Abstract translation: 本发明提供一种具有多个畴的图案化偏振转换器，其可用于将输入线性偏振光转换成具有空间变化偏振状态的输出光，包括产生线性偏振光的畴和基于图案化的线性偏振光产生圆偏振光的畴 域名 具有多个畴的图案化偏振转换器可用于能够检测输入光的偏振状态的偏振传感器应用中。 本发明还提供了图案化的径向和方位偏振转换器，其在诸如光学镊子的应用中具有实用性。 此外，图案化的偏振转换器可以用于使用一步光对准来制造具有相同图案的更多图案化的偏振转换器，以将现有的图案化偏振转换器的图案复制到未图案化的光取向层。
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Patent Agency Ranking
公开(公告)号：US09366934B2
公开(公告)日：2016-06-14
申请号：US14070149
申请日：2013-11-01
Inventor： Abhishek Kumar Srivastava , Ying Ma , Vladimir Grigorievich Chigrinov , Hoi Sing Kwok
IPC: G09G3/36 , G02F1/141 , G02F1/133 , G02F1/1335
CPC classification number: G02F1/141 , G02F1/13306 , G02F2001/133622 , G09G3/36 , G09G2300/0404 , G09G2310/0235
Abstract: A field sequential color (FSC) ferroelectric liquid crystal (FLC) display cell, part of an FSC display, is provided. The FSC FLC display cell includes: two polarizers; an FLC layer, positioned between the two polarizers, the FLC layer comprising FLCs with helix pitch less than the thickness of the FLC layer; and a voltage source, configured to apply an electrical driving voltage to the FLC layer, the electrical driving voltage applied to the FLC layer having an amplitude greater than a threshold voltage for helix unwinding, and wherein the voltage source is further configured to apply electrical driving voltages to light emitting diodes (LEDs) of the FSC display to illuminate pixels of the FSC display. The pixels are illuminated in an FSC manner. The FLC layer is configured to provide a defect-free layer of FLC under the electrical driving voltage applied to the FLC layer.
Abstract translation: 提供场顺序彩色（FSC）铁电液晶（FLC）显示单元，FSC显示器的一部分。 FSC FLC显示单元包括：两个偏振器; 位于两个偏振器之间的FLC层，FLC层包含螺旋桨距小于FLC层厚度的FLC; 以及电压源，被配置为向所述FLC层施加电驱动电压，施加到所述FLC层的电驱动电压具有大于用于螺旋展开的阈值电压的幅度，并且其中所述电压源还被配置为施加电驱动 电压到FSC显示器的发光二极管（LED）以照亮FSC显示器的像素。 像素以FSC方式照亮。 FLC层被配置为在施加到FLC层的电驱动电压下提供无缺陷的FLC层。
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公开(公告)号：US11015120B2
公开(公告)日：2021-05-25
申请号：US15884102
申请日：2018-01-30
Inventor： Valerii Vladimirovich Vashchenko , Evgenii Pavlovich Pozhidaev , Abhishek Kumar Srivastava , Vladimir Grigorievich Chigrinov , Hoi Sing Kwok
Abstract: A low birefringence ferroelectric liquid crystal (FLC) mixture composed of at least two components shows birefringence in the range 0.05 to 0.14, which is suitable for the modern display and photonic devices. The cell gap can be tuned from 1.5 μm to 4 μm to reduces the fabrication complexity and chromatic distortion by electro-optical modulation. The FLC mixtures can be employed in a wide temperature range. The characteristics of the said FLC mixture can be tuned by tuning the concentration of the constituents of the mixture. The helical pitch of the FLC mixtures can be varied from 100 nm to 10 μm. A smectic tilt angle can be varied between 17° to 45° and the spontaneous polarization can be tuned over a wide range to meet requirements of different electro-optical modes, and the FLC mixture is applicable for a wide variety of electro-optical effects.
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公开(公告)号：US10607556B2
公开(公告)日：2020-03-31
申请号：US15524524
申请日：2015-11-06
Inventor： Hoi Sing Kwok , Tsz Kin Ho , Vladimir G. Chigrinov
IPC: G09G3/36 , G09G3/20 , G02F1/1362
Abstract: Systems and methods for driving a pixel of a liquid crystal pixel array with a driving circuit are provided. An exemplary method includes: providing a data signal (Dm) to a storage element via the first transistor (T1); and providing a ramping voltage signal (VRAMP) to a gate of a second transistor (T2) of the driving circuit to control the on-off status of the second transistor (T2); wherein the ramping voltage signal (VRAMP) is based on data stored at the storage element; and wherein a duration of an on-state of the second transistor (T2) corresponds to a transmitting state for the pixel.
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公开(公告)号：US20180240821A1
公开(公告)日：2018-08-23
申请号：US15899995
申请日：2018-02-20
Inventor： Lei Lu , Wei Zhou , Man Wong , Hoi Sing Kwok
IPC: H01L27/12
CPC classification number: H01L27/1251 , G02F1/1368 , G02F2001/13685 , G02F2202/104 , H01L21/266 , H01L27/1225 , H01L27/127 , H01L27/1288 , H01L27/3262 , H01L29/66969 , H01L29/78618 , H01L29/78675 , H01L29/7869 , H01L29/78696
Abstract: This disclosure relates generally to the three-dimensional (3D) integrated thin-film transistors (TFTs) with silicon and metal-oxide (MO) semiconductors as the active layers. In one or more embodiments, an apparatus is provided that comprises a first transistor comprising a silicon active layer, and a second transistor comprising a metal oxide active layer. The second transistor is vertically stacked on the first transistor, and the first transistor and the second transistor share a gate electrode formed between the silicon active layer and the metal oxide active layer. With these embodiments, the gate electrode corresponds to a top gate of the first transistor and a bottom gate of the second transistor.
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公开(公告)号：US20130301126A1
公开(公告)日：2013-11-14
申请号：US13888061
申请日：2013-05-06
Inventor： Tao DU , Fan FAN , Vladimir Grigorievich Chigrinov , Hoi Sing Kwok
IPC: G02B27/28
CPC classification number: G02B27/286 , G02B27/285
Abstract: A polarization converter and polarization conversion systems are provided. The polarization converter and polarization conversion systems include a patterned polarization grating with left hand and right hand polarization grating domains. The polarization grating domains are configured to diffract incident non-polarized light into beams having left and right circular polarization states.
Abstract translation: 提供了偏振转换器和偏振转换系统。 偏振转换器和偏振转换系统包括具有左手和右手偏振光栅域的图案化偏振光栅。 偏振光栅域被配置为将入射的非偏振光衍射成具有左和右圆偏振状态的光束。
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