Patents by Inventor Kai-Han Chang

Kai-Han Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20230017795
    Abstract: A waveguide head-up display (HUD) includes a waveguide that includes a lower surface and an upper surface and is configured to receive an input and project, based on the input, at least one image from the upper surface and into an eyebox, and a prism arranged at least one of on and above the waveguide. The prism includes a lower surface facing the waveguide and configured to receive the at least one image and an upper surface opposite the lower surface configured to project the at least one image received via the lower surface of the prism. The upper surface of the prism is angled relative to the upper surface of the waveguide such that a first normal of the upper surface of the prism is different from a second normal of the upper surface of the waveguide.
    Type: Application
    Filed: July 19, 2021
    Publication date: January 19, 2023
    Inventors: Thomas A. SEDER, Kai-Han CHANG
  • Patent number: 11557234
    Abstract: A method includes detecting at least one remote vehicle that is within a predetermined distance from the host vehicle, detecting that the light of the remote vehicle that is on, determining a luminous intensity of a light beam emitted by the light of at least one remote vehicle that is within the predetermined distance from the host vehicle, comparing the luminous intensity of the light beam emitted by the light of at least one remote vehicle to a predetermined threshold to determine whether the luminous intensity of the light beam emitted by the light is greater than the predetermined threshold in response to determining the luminous intensity of the light of at least one remote vehicle that is within the predetermined distance from the host vehicle, and dimming at least a portion of the windshield of the host vehicle.
    Type: Grant
    Filed: July 15, 2022
    Date of Patent: January 17, 2023
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Madalyn Theresa Eudy, Joseph F. Szczerba, John P. Weiss, Thomas A. Seder, Kai-Han Chang
  • Publication number: 20230008409
    Abstract: A device comprises a plurality of 2D semiconductor nanostructures, a gate structure, a source region, and a drain region. The plurality of 2D semiconductor nanostructures extend in a first direction above a substrate and arranged in a second direction substantially perpendicular to the first direction. The gate structure surrounds each of the plurality of 2D semiconductor nanostructures. The source region and the drain region are respectively on opposite sides of the gate structure.
    Type: Application
    Filed: March 23, 2022
    Publication date: January 12, 2023
    Applicants: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD., NATIONAL YANG MING CHIAO TUNG UNIVERSITY
    Inventors: Chen Han CHOU, Shu-Jui CHANG, Yen-Teng HO, Chia Hsing WU, Kai-Yu PENG, Cheng Hung SHEN, Chenming HU
  • Patent number: 11543656
    Abstract: A substrate, such as a windshield, includes: a first glass element; a second glass element; and a light absorptive element that is disposed directly between the second glass element and the first glass element, that is configured to receive and absorb light output by an image source.
    Type: Grant
    Filed: August 5, 2019
    Date of Patent: January 3, 2023
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Kai-Han Chang, Thomas A. Seder
  • Patent number: 11536960
    Abstract: A head up display (HUD) system includes: one or more light sources and one or more phase modulators configured to generate and output a hologram; and a replicator configured to receive the hologram, to generate N replications of the hologram from the hologram, and to output the N replications of the hologram, where N is an integer greater than or equal to 2.
    Type: Grant
    Filed: August 5, 2019
    Date of Patent: December 27, 2022
    Assignees: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Kai-Han Chang, Thomas A. Seder, Jamieson Leigh Christmas
  • Patent number: 11523091
    Abstract: A head up display (HUD) system includes: a laser; a liquid crystal on silicon (LCoS) panel configured to modulate light output by the laser; a modulator control module configured to, during each predetermined period: apply power to the LCoS panel for a first predetermined ON period; and disconnect the LCoS panel from power for a remainder of the predetermined period; and a laser control module configured to, during each predetermined period: when a temperature of the LCoS panel is less than a predetermined temperature: apply power to the laser for a second predetermined ON period while power is applied to the LCoS panel and after the modulator control module begins applying power to the LCoS panel, where the second predetermined ON period is less than the first predetermined ON period; and disconnect the laser from power for the remainder of the predetermined period.
    Type: Grant
    Filed: April 15, 2021
    Date of Patent: December 6, 2022
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Thomas A. Seder, Kai-Han Chang
  • Patent number: 11508849
    Abstract: A semiconductor device and method of manufacture are provided. In an embodiment a first contact is formed to a source/drain region and a dielectric layer is formed over the first contact. An opening is formed to expose the first contact, and the opening is lined with a dielectric material. A second contact is formed in electrical contact with the first contact through the dielectric material.
    Type: Grant
    Filed: June 29, 2020
    Date of Patent: November 22, 2022
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
    Inventors: Che-Cheng Chang, Kai-Yu Cheng, Chih-Han Lin, Sin-Yi Yang, Horng-Huei Tseng
  • Patent number: 11506892
    Abstract: A holographic display system for a motor vehicle includes a light source for generating a beam of coherent light and a spatial light modulator (SLM) having a two-dimensional pixel array. The two-dimensional pixel array modulates the beam of coherent light for generating a plurality of subframes, with each subframe being associated with one of a plurality of partial fields of view. The system further includes a scanner for directing the subframes onto associated sections of a display surface. The system further includes a computer having a memory including instructions, such that a processor is programmed to control the two-dimensional pixel array of the SLM for generating the subframes. The processor is further programmed to control the scanner for directing the subframes onto associated sections of the display surface and displaying a reconstructed image within a full field of view, which includes each of the partial fields of view.
    Type: Grant
    Filed: May 3, 2021
    Date of Patent: November 22, 2022
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Kai-Han Chang, Thomas A. Seder
  • Publication number: 20220357574
    Abstract: A holographic display system for a motor vehicle includes a coherent light source for generating a beam of coherent light and a spatial light modulator (SLM) having a two-dimensional pixel array, which is encoded with a hologram for modulating a phase of the coherent light. The SLM generates a first diffracted beam associated with a main image and a second diffracted beam associated with a conjugate image, where the first and second diffracted beams are angularly spaced from one another by a first angle. The system further includes an optical component for angularly spacing the first and second diffracted beams from one another by a second angle that is larger than the first angle. The system further includes a display surface receiving the first diffracted beam from the optical component to display the main image, with the display surface being free of the second diffracted beam.
    Type: Application
    Filed: May 6, 2021
    Publication date: November 10, 2022
    Inventors: Kai-Han Chang, Thomas A. Seder
  • Publication number: 20220350140
    Abstract: A holographic display system for a motor vehicle includes a light source for generating a beam of coherent light and a spatial light modulator (SLM) having a two-dimensional pixel array. The two-dimensional pixel array modulates the beam of coherent light for generating a plurality of subframes, with each subframe being associated with one of a plurality of partial fields of view. The system further includes a scanner for directing the subframes onto associated sections of a display surface. The system further includes a computer having a memory including instructions, such that a processor is programmed to control the two-dimensional pixel array of the SLM for generating the subframes. The processor is further programmed to control the scanner for directing the subframes onto associated sections of the display surface and displaying a reconstructed image within a full field of view, which includes each of the partial fields of view.
    Type: Application
    Filed: May 3, 2021
    Publication date: November 3, 2022
    Inventors: Kai-Han Chang, Thomas A. Seder
  • Publication number: 20220343876
    Abstract: A projection system includes a projection device and a control module. The projection device is configured to project (i) a first image in a first virtual image plane, and (ii) a second image in a second virtual image plane, wherein the second virtual image plane is further from an eyebox than the first virtual image plane. The control module is configured to: determine an ambient light luminance level; determine a first luminance level for the first virtual image plane based on the ambient light luminance level; determine a second luminance level of the second virtual image plane based on the first luminance level of the first virtual image plane; and control the at least one projection device to display (i) the first image in the first virtual image plane having the first luminance level, and (ii) the second image in the second virtual image plane having the second luminance level.
    Type: Application
    Filed: April 22, 2021
    Publication date: October 27, 2022
    Inventors: Thomas A. SEDER, Kai-Han CHANG
  • Publication number: 20220342367
    Abstract: A holographic projection system includes a SLM that receives a light beam and generates a modulated beam projected at an eyebox, where: the modulated beam includes multiple versions of a test image; and the test image includes bright objects and transparent regions, which are selected dark areas of interest for measuring luminance. A control module runs a test to characterize contrast in each of multiple virtual image planes including: controlling the SLM to generate the modulated beam; measuring luminance levels of each of the versions of the test image displayed in the virtual image planes; calculating contrast ratios based on the luminance levels of each of the versions of the test image; determining whether the contrast ratios are within predetermined ranges of predetermined contrast ratios; and adjusting operation of the SLM in response to one of the contrast ratios not being within a corresponding one of the predetermined ranges.
    Type: Application
    Filed: April 22, 2021
    Publication date: October 27, 2022
    Inventors: Thomas A. SEDER, Kai-Han CHANG
  • Patent number: 11480789
    Abstract: A direct-retina holographic projection system includes first and second spatial light modulators (SLMs) and a control module. The first SLM receives a beam of light and dithers the beam of light at a predetermined frequency to provide multiple instances of the beam of light. The second SLM receives the instances of the beam of light, displays an encoded phase hologram of a graphic image to be projected, and diffracts the instances of the beam of light to provide instances of the encoded phase hologram with the same graphic image but multiplied with dithered wavefronts. The control module: iteratively adjusts a parameter of the first SLM to generate the instances of the beam of light; and controls operation of the second SLM to, based on the instances of the beam of light, display multiple instances of the graphic image on a retina of an eye of a viewer.
    Type: Grant
    Filed: August 27, 2020
    Date of Patent: October 25, 2022
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Thomas A. Seder, Kai-Han Chang
  • Publication number: 20220337791
    Abstract: A head up display (HUD) system includes: a laser; a liquid crystal on silicon (LCoS) panel configured to modulate light output by the laser; a modulator control module configured to, during each predetermined period: apply power to the LCoS panel for a first predetermined ON period; and disconnect the LCoS panel from power for a remainder of the predetermined period; and a laser control module configured to, during each predetermined period: when a temperature of the LCoS panel is less than a predetermined temperature: apply power to the laser for a second predetermined ON period while power is applied to the LCoS panel and after the modulator control module begins applying power to the LCoS panel, where the second predetermined ON period is less than the first predetermined ON period; and disconnect the laser from power for the remainder of the predetermined period.
    Type: Application
    Filed: April 15, 2021
    Publication date: October 20, 2022
    Inventors: Thomas A. Seder, Kai-Han Chang
  • Publication number: 20220337796
    Abstract: A system for measuring speckle contrast includes: a head up display (HUD) system configured to output a predetermined image and having a first pixels per degree (PPD); an imaging colorimeter: having a field of view; positioned such that the predetermined image is in the field of view; having a second PPD that is at least 2.2 times greater than the first PPD of the HUD system; and configured to capture an image including the predetermined image; and a speckle contrast module configured to determine a speckle contrast of the HUD system based on the image.
    Type: Application
    Filed: April 15, 2021
    Publication date: October 20, 2022
    Inventors: Kai-Han CHANG, Thomas A. SEDER
  • Patent number: 11467415
    Abstract: A system to provide a multi-image head up display (HUD) in a vehicle includes a fixed mirror to project a far-plane image at a first distance from an occupant of the vehicle. Control of a position of display of the far-plane image is based on an eye height position of the occupant. The system also includes a rotatable mirror to project a near-plane image at a second distance, closer than the first distance, from the occupant. Control of a position of display of the near-plane image is based on a manual adjustment of a rotational angle of the rotatable mirror by the occupant. Processing circuitry automatically adjusts the position of display of the far-plane image based on inferring the eye height position of the occupant from the rotational angle of the rotatable mirror that controls the display of the near-plane image.
    Type: Grant
    Filed: July 21, 2021
    Date of Patent: October 11, 2022
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Kai-Han Chang, Thomas A. Seder
  • Publication number: 20220319982
    Abstract: An IC structure comprises a first transistor formed on a substrate, a first interconnect structure over the first transistor, a dielectric layer over the first interconnect structure, a plurality of 2D semiconductor islands on the dielectric layer, and a plurality of second transistors formed on the plurality of 2D semiconductor islands.
    Type: Application
    Filed: August 23, 2021
    Publication date: October 6, 2022
    Applicants: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD., NATIONAL YANG MING CHIAO TUNG UNIVERSITY
    Inventors: Chenming HU, Shu-Jui CHANG, Chen-Han CHOU, Yen-Teng HO, Chia-Hsing WU, Kai-Yu PENG, Cheng-Hung SHEN
  • Publication number: 20220321846
    Abstract: The disclosure provides a time-lapse photographic device. The time-lapse photographic device includes a camera module, a drive module, an environment detection module, and a control unit. The drive module is connected to the camera module to drive the camera module to rotate. The environment detection module is configured to detect an external environment of the time-lapse photographic device to generate an environment detection signal. The control unit is electrically connected to the camera module, the drive module, and the environment detection module. The control unit generates, according to a shooting stop parameter, a plurality of intermittent drive signals to control the drive module, and controls the camera module to shoot at intervals of the drive signals. The control unit adjusts operation of at least one of the camera module and the drive module according to the environment detection signal.
    Type: Application
    Filed: February 15, 2022
    Publication date: October 6, 2022
    Inventors: Hsin-Yi PU, Kai-Yu HSU, Lai-Peng WONG, Chieh LI, Ting-Han CHANG, Ching-Xsuan CHEN
  • Patent number: 11454813
    Abstract: A holographic display system is provided and includes a light source, a holographic projector, and a polarizer. The light source is configured to generate a first light beam. The holographic projector includes a spatial light modulator configured to adjust phases of respective portions of the first light beam to generate a phase hologram beam. The phase hologram beam comprises a first polarization and a second polarization. The polarizer is configured to filter out light having the first polarization from the phase hologram beam to provide at least a portion of a filtered phase hologram beam at a diffuser to generate a holographic image, wherein the filtered phase hologram beam includes light with the second polarization and does not include light with the first polarization.
    Type: Grant
    Filed: November 7, 2019
    Date of Patent: September 27, 2022
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Kai-Han Chang, Thomas A. Seder
  • Patent number: 11434426
    Abstract: A fast flexoelectro-optic switching device containing bimesogen-doped and polymer-stabilized vertical standing helix (PSVSH) in a cholesteric liquid crystal. The PSVSH device exhibits a response time of less than 0.7 millisecond, high contrast and negligible hysteresis which is suitable for applications including blur-free displays, field-sequential color displays and active optical elements.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: September 6, 2022
    Assignee: Kent State University
    Inventors: Liang-Chy Chien, Vinay Joshi, Kai-Han Chang