Patents Assigned to Pixart Imaging, Inc.
  • Physiological detection system with adjustable signal source
    Patent number: 11806168
    Abstract: A physiological detection system including a light source module, a photo sensor and a processor is provided. The light source module is configured to provide light to illuminate a skin region. The photo sensor is configured to detect emergent light passing the skin region with at least one signal source parameter and output an image signal. The processor is configured to calculate a confident level according to the image signal to accordingly adjust the at least one signal source parameter.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: November 7, 2023
    Assignee: PIXART IMAGING INC.
    Inventors: Sheau-Foong Chong, Chun-Wei Chen
  • Moving robot with improved identification accuracy of carpet
    Patent number: 11809195
    Abstract: There is provided a moving robot including a light projector, an image sensor and a processing unit. The light projector projects a vertical light segment and a horizontal light segment toward a moving direction. The image sensor captures, toward the moving direction, an image frame containing a first light segment image associated with the vertical light segment and a second light segment image associated with the horizontal light segment. The processing unit recognizes a plush carpet in the moving direction when a vibration intensity of the second light segment image is higher than a predetermined threshold, and an obstacle height calculated according to the first light segment image is larger than a height threshold.
    Type: Grant
    Filed: June 11, 2021
    Date of Patent: November 7, 2023
    Assignee: PIXART IMAGING INC.
    Inventor: Guo-Zhen Wang
  • Method and system for optical distance measurement
    Patent number: 11808852
    Abstract: An optical distance measurement method includes: acquiring a plurality of sensed values based on detecting light; performing a filtering operation to select a plurality of selected sensed values from the plurality of sensed values; determining a location of a centroid according to the plurality of selected sensed values; and calculating a plurality of depth values with respect to a plurality of detecting points according to the location of the centroid and a plurality of depth information transformation functions respectively corresponding to the detecting points.
    Type: Grant
    Filed: September 27, 2021
    Date of Patent: November 7, 2023
    Assignee: PixArt Imaging Inc.
    Inventor: Guo-Zhen Wang
  • Tracking device with improved work surface adaptability
    Patent number: 11808853
    Abstract: A tracking device including an image sensor, a light source and a processor is provided. The image sensor senses reflected light or scattered light formed by the light source illuminating a work surface. The processor calculates a trace of the tracking device according to one of the reflected light and the scattered light that generates more apparent image features so as to increase the adaptable work surfaces.
    Type: Grant
    Filed: March 21, 2022
    Date of Patent: November 7, 2023
    Assignee: PIXART IMAGING INC.
    Inventors: Hui-Hsuan Chen, Cheng-Lin Yang, Tzu-Yu Chen
  • Pixel circuit selecting to output time difference data or image data
    Patent number: 11812176
    Abstract: There is provided a pixel circuit capable of outputting time difference data or image data, and including a first temporal circuit and a second temporal circuit. The first temporal circuit is used to store detected light energy of a first interval and a second interval as the time difference data. The second temporal circuit is used to store detected light energy of the second interval as the image data. The pixel circuit is used to output a pulse width signal corresponding to the time difference data or the image data in different operating modes.
    Type: Grant
    Filed: August 6, 2021
    Date of Patent: November 7, 2023
    Assignee: PIXART IMAGING INC.
    Inventors: Ren-Chieh Liu, Yi-Cheng Chiu
  • Computer system and gaming mouse
    Patent number: 11806610
    Abstract: There is provided a computer system including a mouse device and a host. The mouse device receives a command script from the host to determine output data to be transmitted to the host. The output data includes, for example, at least one pressed key signal and/or a movement signal. The command script is previously recorded in the host or is determined according to raw data detected by the mouse device. The present disclosure further provides a gaming mouse.
    Type: Grant
    Filed: November 29, 2021
    Date of Patent: November 7, 2023
    Assignee: PIXART IMAGING INC.
    Inventor: Jr-Yi Li
  • Moving robot with improved identification accuracy of step distance
    Patent number: 11803191
    Abstract: There is provided a moving robot including a light projector, an image sensor and a processing unit. The light projector projects a vertical light segment toward a moving direction. The image sensor captures, toward the moving direction, an image frame containing a light segment image associated with the vertical light segment. The processing unit calculates a step distance and a segment feature according to the image frame, outputs a flag signal according to the segment feature to indicate whether the calculated step distance is confident or not, and perform a pixel interpolation in calculating the step distance to improve the identification accuracy.
    Type: Grant
    Filed: February 24, 2022
    Date of Patent: October 31, 2023
    Assignee: PIXART IMAGING INC.
    Inventor: Guo-Zhen Wang
  • Touch sensor, touch pad, method for identifying inadvertent touch event and computer device
    Patent number: 11803273
    Abstract: A touch sensor, a touch pad, a method for identifying an inadvertent touch event and a computer device are provided. A control circuit of the touch sensor identifies whether there is the inadvertent touch event in response to the touch signals that indicates at least one touch event applied to the touch pad having the touch sensor. In the method, the touch signals are discarded if the inadvertent touch event is identified when a touch position corresponding to the touch signals is within an object detection area defined for the touch pad, or the touch positions in response to the touch signals are reported to the computer device if a multi-touch event is identified when the touch positions are within a touch detection area defined for the touch pad.
    Type: Grant
    Filed: April 22, 2021
    Date of Patent: October 31, 2023
    Assignee: PIXART IMAGING INC.
    Inventors: Chi-Chieh Liao, Yi-Hsien Ko
  • NON-SOLID MATERIAL DETECTION METHOD, NON-SOLID MATERIAL DETECTION DEVICE, DISTANCE COMPUTING DEIVCE, DISTANCE COMPUTING METHOD
    Publication number: 20230341551
    Abstract: A non-solid material detection device, comprising: a processing circuit; an image sensor; a first light source, configured to emit first light following a first direction; a second light source, configured to emit second light following a second direction. If the non-solid material detection device is located on the surface, the first direction is toward a surface and the second direction is leaving or parallel with the surface. The processing circuit determines an obstacle based on a second sensing image generated according to the second light and determines non-solid material based on a first sensing image generated according to the first light. The present invention also discloses a distance computing device. Via the present invention, the non-solid material detection and the distance computing can be more accurate.
    Type: Application
    Filed: April 20, 2022
    Publication date: October 26, 2023
    Applicant: PixArt Imaging Inc.
    Inventor: Guo-Zhen Wang
  • Optical encoder capable of identifying positions based on PWM signals
    Patent number: 11799699
    Abstract: The present disclosure is related to an optical encoder which is configured to provide precise coding reference data by feature recognition technology. To apply the present disclosure, it is not necessary to provide particular dense patterns on a working surface. The precise coding reference data can be generated by detecting surface features of the working surface.
    Type: Grant
    Filed: December 15, 2022
    Date of Patent: October 24, 2023
    Assignee: PIXART IMAGING INC.
    Inventors: Wai-Lian Teo, Yen-Min Chang
  • POINTING DEVICE AND METHOD CAPABLE OF CORRECTING ITS USB STATE BY MONITORING VOLTAGE/STATE OF USB COMMUNICATION INTERFACE
    Publication number: 20230333995
    Abstract: A method of a pointing device which is used to be coupled to a host system through a universal serial bus (USB) communication interface includes: providing a USB driver device to communicate with the host system via the USB communication interface; monitoring a specific voltage change or a specific data transmission state of the USB communication interface to generate a monitoring result; and correcting a USB state of the USB driver device when the monitoring result indicates that a undefined or abnormal behavior of the host system occurs.
    Type: Application
    Filed: June 21, 2023
    Publication date: October 19, 2023
    Applicant: PixArt Imaging Inc.
    Inventors: Ching-Chih Chen, Jr-Yi Li
  • Pixel circuit outputting pulse width signal and optical sensor using the same
    Patent number: 11792550
    Abstract: There is provided a pixel circuit for performing analog operation including a photodiode, a first temporal circuit, a second temporal circuit and an operation circuit. Within a first interval, the photodiode detects first light energy to be stored in the first temporal circuit. Within a second interval, the photodiode detects second light energy to be stored in the second temporal circuit. Within an operation interval, the first temporal circuit outputs a first detection signal having a first pulse width according to the first light energy and outputs a second detection signal having a second pulse width according to the second light energy for being calculated by the operation circuit.
    Type: Grant
    Filed: November 29, 2022
    Date of Patent: October 17, 2023
    Assignee: PixArt Imaging Inc.
    Inventors: Ren-Chieh Liu, Chih-Huan Wu, Yi-Hsien Ko, Han-Chi Liu
  • LIQUID PROVIDING SYSTEM
    Publication number: 20230326062
    Abstract: A liquid providing system of detecting a target container includes a main body, a holder, an optical sensor and an operational processor. The main body has a supporting platform. The holder is disposed on the supporting platform, and the holder is made by low reflectivity material and adapted to hold the target container. The optical sensor is disposed above the supporting platform and adapted to output a detection image containing the target container and the holder. The operational processor is electrically connected to the optical sensor, and adapted to analyze the detection image and then acquire an effective feature inside the detection image for distinguishing the target container from the holder.
    Type: Application
    Filed: June 8, 2023
    Publication date: October 12, 2023
    Applicant: PixArt Imaging Inc.
    Inventors: Guo-Zhen Wang, Tse-En Peng
  • OPTICAL TIME-OF-FLIGHT SENSOR, METHOD, AND PROCESSING CIRCUIT CAPABLE OF AVOIDING MISJUDGMENT OF CHANNEL SAMPLING
    Publication number: 20230324524
    Abstract: An optical time-of-flight sensor includes a sensor array and a channel sampling circuit. The channel sampling circuit is arranged for receiving a photon pulse signal, generated from a senor unit of the sensor array, receiving a first channel selection signal to generate a first freezing signal, generating a first channel event signal to a first counting circuit in response to the first freezing signal and the photon pulse signal, and receiving the first channel event signal to generate and count a pulse number of the photon pulse signal received by the first channel; when a rising edge of the photon pulse signal occurs, the first freezing signal is kept at a previous state until a falling edge of the photon pulse signal occurs.
    Type: Application
    Filed: April 11, 2022
    Publication date: October 12, 2023
    Applicant: PixArt Imaging Inc.
    Inventors: Yueh-Lin Chung, Tso-Sheng Tsai
  • Navigation device capable of estimating contamination and determining update threshold
    Patent number: 11785359
    Abstract: There is provided an optical navigation device including an image sensor and a processing unit. The image sensor outputs successive image frames. The processing unit calculates a contamination level and a motion signal based on filtered image frames, and determines whether to update a fixed pattern noise (FPN) stored in a frame buffer according to a level of FPN subtraction, the calculated contamination level and the calculated motion signal to optimize the update of the fixed pattern noise.
    Type: Grant
    Filed: January 14, 2023
    Date of Patent: October 10, 2023
    Assignee: PixArt Imaging Inc.
    Inventors: Joon-Chok Lee, Kevin Len-Li Lim
  • Motion sensor using temporal difference pixels and lift-up detection thereof
    Patent number: 11783633
    Abstract: There is provided an optical sensor including a pixel matrix and a readout circuit. The pixel matrix includes multiple pixels arranged in a matrix, and each of the multiple pixels outputs temporal difference pixel data. The readout circuit sequentially reads the pixel matrix using a readout block, and performs the hybrid difference calculation on the temporal difference pixel data of pixels within the readout block. Accordingly, the output of the readout circuit is the data accomplishing temporal difference and spatial difference.
    Type: Grant
    Filed: May 28, 2021
    Date of Patent: October 10, 2023
    Assignee: PIXART IMAGING INC.
    Inventors: Ren-Chieh Liu, Yi-Hsien Ko, Han-Chi Liu
  • IMAGE QUALITY IMPROVING METHOD, OPTICAL NAVIGATION DEVICE CONTROL METHOD, AND OPTICAL NAVIGATION DEVICE USING THE METHODS
    Publication number: 20230315218
    Abstract: An optical navigation device control method comprising: (a) computing brightness contrast information of original images captured by an image sensor of an optical navigation device; (b) computing brightness variation levels of the original images; (c) improving image qualities of the original images based on the brightness contrast information and the brightness variation levels, to generate adjusted images; and (d) computing movements of the optical navigation device based on displacement between the adjusted images. The optical navigation device is located on a surface. The step (d) comprises: collecting reference images of different parts of the surface for a plurality of combinations of moving directions of the optical navigation device and placement directions of the surface; and determining a type of the surface via comparing images of a current surface with the reference images.
    Type: Application
    Filed: May 4, 2023
    Publication date: October 5, 2023
    Applicant: PixArt Imaging Inc.
    Inventors: Bo-Yi Chang, Yao-Hsuan Lin
  • Respiration rate detection device and breath detection device adopting motion denoising
    Patent number: 11771375
    Abstract: A heart rate detection module including a PPG measuring device, a motion sensor and a processing unit is provided. The PPG measuring device is configured to detect a skin surface in a detection period to output a PPG signal. The motion sensor is configured to output an acceleration signal corresponding to the detection period. The processing unit is configured to respectively convert the PPG signal and the acceleration signal to first frequency domain information and second frequency domain information, determine a denoising parameter according to a maximum spectrum peak value of the second frequency domain information to denoise the first frequency domain information, and calculate a heart rate according to a maximum spectrum peak value of the denoised first frequency domain information.
    Type: Grant
    Filed: August 7, 2019
    Date of Patent: October 3, 2023
    Assignee: PIXART IMAGING INC.
    Inventors: Ming-Chang Li, Ren-Hau Gu
  • Light control circuit and frequency detector of optical encoder system, and operating method of frequency detector
    Patent number: 11774269
    Abstract: There is provided a light control circuit including a light detector, a frequency detector, an error amplifier, an NMOS driver and a light source. The frequency detector identifies a signal frequency according to detected voltage signals outputted by the light detector and generates a control signal accordingly. The NMOS driver changes a drive current of the light source according to an output of the error amplifier. The error amplifier changes a bandwidth thereof according to the control signal from the frequency detector to regulate a response time of the drive current of the light source.
    Type: Grant
    Filed: March 31, 2022
    Date of Patent: October 3, 2023
    Assignee: PixArt Imaging Inc.
    Inventors: Kuan-Choong Shim, Gim-Eng Chew
  • Group voice communication of walkie-talkie mode in Bluetooth communication system
    Patent number: 11778427
    Abstract: A voice communication method between two or more wearable electronic devices via Bluetooth communication includes: providing the two or more wearable electronic devices paired with a mobile phone device; determining whether a distance between the two or more wearable electronic devices is larger than a distance threshold; controlling a wearable electronic device to enter a walkie-talkie mode to start a walkie-talkie conversation with one or more other wearable electronic devices when the distance is larger than the distance threshold; and during the walkie-talkie mode using the such wearable electronic device to send voice data from the wearable electronic device to one or more other wearable electronic devices to make the other wearable electronic device(s) to receive and play the voice data in the walkie-talkie mode for different user(s).
    Type: Grant
    Filed: September 9, 2020
    Date of Patent: October 3, 2023
    Assignee: PixArt Imaging Inc.
    Inventors: Shih-Feng Chen, Yen-Min Chang