Xiang Zhang

20130104983, May 2, 2013

Oct 31, 2012

13/665380

The Regents of the University of California - Oakland CA, US
Avi Niv - Kfar-Blum, IL
Majid Gharghi - Berkeley CA, US
Xiang Zhang - Alamo CA, US

The Regents of the University of California - Oakland CA

H01L 31/0232
H01L 31/18

136259, 438 72, 257E31127

This invention improves the efficiency of non-optimal solar cell materials, enabling them to achieve the same efficiency as optimal materials. The invention describes a method of improving the emission and absorption properties of a generic photovoltaic cell using feedback reflectors and/or filters, increasing the open circuit voltage of the cell, and thus the overall efficiency. Specific examples of single junction photovoltaics are detailed, but not limited to. Particularly, semiconducting solar cells in either single- or multi-junction formats are described. The invention can be applied to any functioning solar cell to increase the efficiency, while describing the maximal efficiency available using thermodynamic identities. Other examples are included, such as organic photovoltaic, nanostractured photovoltaic devices, and non-planar geometries. The invention thus enables using non-optimal photovoltaic materials to achieve similar efficiency results as optimal ones, regardless of the designed structure or material used.

20220367245, Nov 17, 2022

May 13, 2021

17/319368

- Santa Clara CA, US
Heesoo KANG - Cupertino CA, US
Xiang ZHANG - Sunnyvale CA, US

H01L 21/762
H01L 27/146

A shallow trench isolation (STI) structure and method of fabrication includes forming a shallow trench isolation (STI) structure having a polygonal shaped cross-section in a semiconductor substrate of an image sensor includes a two-step etching process. The first step is a dry plasma etch that forms a portion of the trench to a first depth. The second step is a wet etch process that completes the trench etching to the desired depth and cures damage caused by the dry etch process. A CMOS image sensor includes a semiconductor substrate having a photodiode region and a pixel transistor region separated by a shallow trench isolation (STI) structure having a polygonal shaped cross-section.

20220290797, Sep 15, 2022

May 23, 2022

17/664554

- Cupertino CA, US
Bradley J. Hamel - San Carlos CA, US
Brett W. Degner - Menlo Park CA, US
David H. Narajowski - San Jose CA, US
Hao Zhu - San Jose CA, US
Lauren M. Farrell - Mountain View CA, US
Sunita Venkatesh - San Francisco CA, US
Peter N. Jeziorek - San Jose CA, US
Edward T. Sweet - San Francisco CA, US
David A. Jungquist - Aspen CO, US
Karen Y. Cheng - Mountain View CA, US
Xiang Zhang - Sunnyvale CA, US
Danny L. McBroom - Leander TX, US
Michael D. McBroom - Leander TX, US
Laura M. DeForest - San Mateo CA, US

F16M 11/04
G06F 1/16
F16M 11/10
H05K 5/02
H05K 5/00
F16M 11/06
F16M 11/12
F16M 11/08

Display assemblies for supporting displays on stands or support arms have mount portions to removably attach to the displays using magnetic assemblies and latches. The magnetic assemblies and latches can improve user experience and allow the display to be installed on a support arm from the viewing side of the display and without having to see or reach behind the display. Magnetic structures can center a mount portion of the support arm and a recess of the display and can attract them to each other. Laterally-extending latches can ensure the display is not inadvertently removed. Locking mechanisms can prevent the display from being rotated to a portrait orientation when sufficient space around the display and the necessary user intent is not provided.

20220292730, Sep 15, 2022

Aug 27, 2021

17/446263

- Palo Alto CA, US
Xiang ZHANG - Sunnyvale CA, US
Shan LIU - San Jose CA, US

TENCENT AMERICA LLC - Palo Alto CA

G06T 9/40
G06T 15/08

In a method of point cloud attribute decoding in a point cloud decoder, a sorting method of a set of points of a point is determined. A quantization parameter for quantizing transform coefficients of a Haar-based attribute coding of the point cloud is determined based on first signaling information in a coded bitstream of the point cloud. The Haar-based attribute coding is configured to perform point cloud compression on the set of points of the point cloud based on a Haar transform. An entropy decoding method for decoding the quantized transform coefficients is determined according to the quantization parameter that is determined based on the first signaling information. The quantized transform coefficients are further determined based on the entropy decoding method. Attributes of the point cloud are reconstructed based on the determined sorting method and the determined quantized transform coefficients.

20220232253, Jul 21, 2022

Aug 17, 2021

17/404740

- Palo Alto CA, US
Xiang ZHANG - Sunnyvale CA, US
Shan LIU - San Jose CA, US

TENCENT AMERICA LLC - Palo Alto CA

H04N 19/597
H04N 19/70

In some examples, an apparatus for point cloud compression/decompression includes processing circuitry. The processing circuitry determines a flag that indicates an enable/disable control for saving coding state in a largest coding unit (LCU) based coding of a point cloud. In some examples, the processing circuitry stores coding state information before a coding of a first LCU; and in response to the flag indicating an enable control, the processing circuitry restores, a coding state according to the stored coding state information before a coding of a second LCU. In some examples, in response to the flag indicating an enable control, the processing circuitry stores the coding state information before the coding of the first LCU. In some examples, in response to the flag indicating a disable control, the processing circuitry skip the storing/restoring of the coding state information.

20220180567, Jun 9, 2022

Sep 3, 2021

17/466729

- Palo Alto CA, US
Xiang ZHANG - Sunnyvale CA, US
Shan LIU - San Jose CA, US

TENCENT AMERICA LLC - Palo Alto CA

G06T 9/00
G06T 9/40
G06T 3/40

According to an aspect of the disclosure, a method of point cloud geometry encoding in a point cloud encoder is provided. In the method, geometry coding is performed on a point cloud at a first partition depth. Further, a plurality of largest coding units (LCUs) of the point cloud is determined at a second partition depth. A coding state of a LCU of the plurality of LCUs of the point cloud is set at the second partition depth. The geometry coding is performed on the plurality of LCUs of the point cloud at the second partition depth based on the coding state of the LCU at the second partition depth.

20230088886, Mar 23, 2023

Sep 13, 2022

17/943269

- Palo Alto CA, US
Chao HUANG - Palo Alto CA, US
Xiaozhong XU - State College PA, US
Xiang ZHANG - Sunnyvale CA, US
Shan LIU - San Jose CA, US

Tencent America LLC - Palo Alto CA

H04N 19/91
G06T 15/04
G06T 9/00
H04N 19/124

In a method of processing UV coordinates of a three-dimensional (3D) mesh, the UV coordinates of the 3D mesh are received. The UV coordinates are two-dimensional (2D) texture coordinates that include U coordinates in a first axis and V coordinates in a second axis, and are mapped with vertices of the 3D mesh. The UV coordinates of the 3D mesh are processed based on at least one of a quantization process, a separation process, and a transformation process. The quantization process is configured to convert the UV coordinates into a plurality of indicators. The separation process is configured to separate the UV coordinates into the U coordinates and the V coordinates respectively. The transformation process is configured to convert the UV coordinates from a spatial domain into a transform domain. Compression is performed on the processed UV coordinates after the processing of the UV coordinates.

20230074378, Mar 9, 2023

Sep 6, 2022

17/903634

- Palo Alto CA, US
Xiang ZHANG - Sunnyvale CA, US
Shan LIU - San Jose CA, US
Chao HUANG - Palo Alto CA, US
Jun TIAN - Belle Mead NJ, US

Tencent America LLC - Palo Alto CA

H04N 19/132
H04N 19/46
H04N 19/177
H04N 19/172

Aspects of the disclosure provide methods and apparatuses for mesh coding (e.g., compression and decompression). In some examples, an apparatus for mesh coding includes processing circuitry. The processing circuitry decodes a plurality of initial maps in two-dimension from a bitstream carrying a three-dimensional (3D) mesh frame. The processing circuitry determines at least two sampling rates associated with different portions of the plurality of initial maps and recovers from the plurality of initial maps and based on the at least two sampling rates associated with the different portions of the plurality of initial maps to obtain a plurality of recovered maps. A first portion of the plurality of initial maps is recovered based on a first sampling rate, and a second portion of the plurality of initial maps is recovered based on a second sampling rate. The processing circuitry reconstructs the 3D mesh frame based on the plurality of recovered maps.