Patents Assigned to STMicroelectronics Asia Pacific Pte. Ltd.
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Patent number: 9933884Abstract: An electronic device includes a processor that acquires touch data values corresponding to different locations of a touch display, and identifies an island in the touch data that has touch data values acquired from adjacent locations of the touch display that indicate a potential touch. A first area of the island is determined from touch data values that exceed a first threshold value, and a second area of the island is determined from touch data values that exceed a second threshold value. If the first area is less than a multiple of the second area, coordinates of a location of the island are determined from the touch data values indicating the potential touch. If the first area is at least the multiple of the second area, coordinates of a location of the island are determined from the touch data values indicating the potential touch that exceed a third threshold value.Type: GrantFiled: July 29, 2015Date of Patent: April 3, 2018Assignee: STMICROELECTRONICS ASIA PACIFIC PTE LTDInventors: Manivannan Ponnarasu, Leo Lee
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Publication number: 20180083606Abstract: A circuit includes a counter circuit, a logic circuit, and a clock divider. The counter circuit includes a clock divider counter to be loaded with most significant bits of a divider value, and decremented at a same edge of each pulse of a clock signal. The logic circuit compares a value contained in the divider counter to a reference value and generates an end count signal as a function of the value contained in the divider counter matching the reference value, and transitions a toggle signal at a same edge of each pulse of the end count signal. The clock divider counter is reloaded with the most significant bits of the divider value as a function of the end count signal. The clock divider generates a divided version of the clock signal as a function of the toggle signal.Type: ApplicationFiled: November 13, 2017Publication date: March 22, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventor: Beng-Heng Goh
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Publication number: 20180074651Abstract: A method for multi-touch integrity sensing for a multi-touch capacitive touch screen is disclosed. By determining the integrity of touches, a distinction is identified between wanted touches, such as via a finger or stylus, and unwanted touches such as via foreign matter, errors, and the like.Type: ApplicationFiled: November 27, 2017Publication date: March 15, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Jerry Kim, Tae-gil Kang, Glen Kang, Rooney Kim
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Publication number: 20180074619Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.Type: ApplicationFiled: November 15, 2017Publication date: March 15, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Praveesh Chandran, Baranidharan Karuppusamy, Giuseppe Noviello, Chee Weng Cheong, Leonard Liviu Dinu, Dianbo Guo, Kien Beng Tan, Chaochao Zhang
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Publication number: 20180059818Abstract: An electronic device disclosed herein includes a display layer generating display noise based on scanning thereof, and a sensing layer including a plurality of sense lines. A common voltage layer is coupled to the display layer and the sensing layer, with the common voltage layer capacitively coupling the display noise from the display layer to the each of the plurality of sense lines of the sensing layer via a different parasitic impedance. An amplitude of the display noise seen at an input to each sense line is a function of a location of that sense line. The electronic device includes a plurality of compensation impedances, with each compensation impedance coupled to a different one of the plurality of sense lines. Each of the plurality of compensation impedances has an impedance value such that an amplitude of the display noise at an output of each sense line is substantially equal.Type: ApplicationFiled: August 25, 2016Publication date: March 1, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Leonard Liviu Dinu, Chee Weng Cheong, Eng Jye Ng
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Publication number: 20180046320Abstract: A circuit described herein includes a charge to voltage converter circuit having an input coupled to receive a sense signal from a sense node associated with a mutual capacitance to be sensed, and an output. A reset switch is coupled between the output of the charge to voltage converter circuit and the input of the charge to voltage converter. An accumulator circuit is configured to accumulate voltages at the output of the charge to voltage converter circuit and to generate an accumulator output signal. Control circuitry is configured to generate control signals for the reset switch and accumulator circuit so as to reduce noise in the accumulator output signal.Type: ApplicationFiled: August 12, 2016Publication date: February 15, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Hugo Gicquel, Chee Weng Cheong
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Publication number: 20180046309Abstract: An alternating current (AC) drive signal having a first frequency and a high logic level at a boosted supply voltage is applied to drive a capacitive sensing line of a capacitive touch panel. The boosted supply voltage is generated by boosting an input voltage. The voltage boosting is effectuate by a charge pump circuit operating synchronous to assertion of the AC drive signal with a charge transfer time that is adaptable to different capacitive load conditions.Type: ApplicationFiled: August 11, 2016Publication date: February 15, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Abhishek Singh, Hugo Gicquel
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Patent number: 9874974Abstract: A method of compensated touch data values disclosed herein includes acquiring touch data values about a dead sensing zone of a touch screen, and determining a peak value of those touch data values. Then, a new peak value is calculated as a function of an average of the peak value and another value of the touch data value, and a sharpness value for the dead sensing zone is generated if a second highest value of the touch data values is less than the new peak value. Thereafter, compensated touch data values are generated for the dead sensing zone if the second highest value is greater than the new peak value.Type: GrantFiled: April 8, 2016Date of Patent: January 23, 2018Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Rooney Kim, Lokesh Kumar Korapati
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Patent number: 9874986Abstract: A readout device for a capacitive sense matrix includes a computer readable storage medium configured to store capacitance data. The capacitance data represents capacitance values of the capacitive sense matrix. The readout device also includes a readout circuit configured to receive a signal from the capacitive sense matrix, the readout circuit being configured based upon the capacitance data. Also described are a readout method and a method of compensating for variations in capacitance.Type: GrantFiled: November 19, 2015Date of Patent: January 23, 2018Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Yannick Guedon, Sze-Kwang Tan, Dianbo Guo
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Publication number: 20180018037Abstract: Disclosed herein is an electronic device including a first touch circuit to be coupled to a first touch sensing unit, the first touch sensing unit having first drive lines and first sense lines intersecting the first drive lines. A second touch circuit is to be coupled to a second touch sensing unit, the second touch sensing unit having second drive lines and second sense lines intersecting the second drive lines. A touch force circuit is to be coupled to a touch force sensing unit, the touch force sensing unit having third drive lines and third sense lines intersecting the third drive lines. The first touch circuit, second touch circuit, and touch force circuit are configured to drive the first, second, and third drive lines as a function of a synchronization signal, and acquire data from the first, second, and third sense lines as a function of the synchronization signal.Type: ApplicationFiled: July 13, 2016Publication date: January 18, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventor: Kien Beng Tan
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Publication number: 20180020033Abstract: Disclosed herein is a method including receiving a stream of packets into a buffer, each packet having a processed video data portion and a page count portion, the processed video data portion being a result of a modulo operation performed on a word of video data, and the page count portion being a data page number on which the word of video data is to be placed. Each packet is read from the buffer, and an output packet including the video data portion and a data tag portion is generated therefrom. The data tag portion is associated with, but does not directly represent, the data page number where the word of video data of the processed video data portion or of video data of a processed video data portion of a next packet, is to be placed. Each data tag portion contains fewer bits than each corresponding page count portion.Type: ApplicationFiled: July 12, 2016Publication date: January 18, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventor: Beng Heng Goh
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Patent number: 9870113Abstract: A capacitive discharge circuit includes a line having a capacitance, a switched capacitor circuit including a capacitor, a switched circuit coupled to the line, and a voltage regulator coupled between the switched capacitor circuit and the switched circuit. A controller operates the switched capacitor circuit and switched circuit to in a first phase, charge the capacitor by coupling the capacitor between a common mode and a power supply, and in a second phase, discharge the capacitor by coupling the voltage regulator in series with the capacitor between the power supply node a ground. The controller is also configured to in a third phase, charge the capacitor by coupling the capacitor between the common mode and the power supply, and in a fourth phase, share charge between the line and the capacitor by coupling the voltage regulator and the capacitor in series between the line and the ground.Type: GrantFiled: August 17, 2017Date of Patent: January 16, 2018Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Chee Weng Cheong, Dianbo Guo, Kien Beng Tan, Yannick Guedon
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Publication number: 20180011596Abstract: A method of foreign matter rejection for multi-touch capacitive touch screens includes performing touch detection in both self-capacitance mode and mutual capacitance mode. By combining information from both modes, a distinction is identified between wanted touches, such as by a finger or stylus, and unwanted touches such as by foreign matter.Type: ApplicationFiled: July 11, 2016Publication date: January 11, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Lokesh Kumar Korapati, Manivannan Ponnarasu, Mythreyi Nagarajan
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Publication number: 20180011595Abstract: A system and method for multi-touch integrity sensing for a multi-touch capacitive touch screen is disclosed. The system and method determines a distinction between wanted touches, such as via a finger or stylus, and unwanted touches such as via foreign matter, errors, and the like.Type: ApplicationFiled: July 5, 2016Publication date: January 11, 2018Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Tae-gil Kang, Jerry Kim, Kai Lim
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Patent number: 9864468Abstract: A method for multi-touch integrity sensing for a multi-touch capacitive touch screen is disclosed. By determining the integrity of touches, a distinction is identified between wanted touches, such as via a finger or stylus, and unwanted touches such as via foreign matter, errors, and the like.Type: GrantFiled: June 9, 2016Date of Patent: January 9, 2018Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Jerry Kim, Tae-gil Kang, Glen Kang, Rooney Kim
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Patent number: 9864395Abstract: A current mirror circuit includes an input current leg and an output current leg. The input current leg includes: a first bipolar junction transistor (BJT) having a collector terminal configured to receive an input current sourced at a current node and a first metal oxide semiconductor field effect transistor (MOSFET) having a gate terminal coupled to the current node and a source terminal coupled to a base terminal of the first BJT. The output current leg includes: a second BJT having a collector terminal configured to supply an output current and a second MOSFET having a gate terminal coupled to the current node and a source terminal coupled to a base terminal of the second BJT.Type: GrantFiled: December 2, 2016Date of Patent: January 9, 2018Assignees: STMicroelectronics Asia Pacific Pte Ltd, STMicroelectronics Design and Application S.R.O.Inventors: Roman Prochazka, Chee Weng Cheong
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Patent number: 9863902Abstract: A resistive microelectronic fluid sensor implemented as an integrated voltage divider circuit can sense the presence of a fluid within a fluid reservoir, identify the fluid, and monitor fluid temperature or volume. Such a sensor has biomedical, industrial, and consumer product applications. After fluid detection, the fluid can be expelled from the reservoir and replenished with a fresh supply of fluid. A depression at the bottom of the sample reservoir allows a residual fluid to remain undetected so as not to skew the measurements. Electrodes can sense variations in the resistivity of the fluid, indicating a change in the fluid chemical composition, volume, or temperature. Such fluctuations that can be electrically sensed by the voltage divider circuit can be used as a thermal actuator to trigger ejection of all or part of the fluid sample.Type: GrantFiled: March 7, 2014Date of Patent: January 9, 2018Assignee: STMicroelectronics Asia Pacific Pte Ltd.Inventors: Archit Giridhar, Teck Khim Neo
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Publication number: 20170371442Abstract: An electronic device includes a flexible substrate. The flexible substrate includes a first portion having a plurality of first conductive lines formed thereon, a second portion having a plurality of second conductive lines formed thereon, and an intermediate portion mechanically coupling the first portion to the second portion. The intermediate portion is configured to permit folding so that the first and second portions can be arranged back-to-back or face-to-face such that plurality of the second conductive lines and plurality of first conductive lines are oriented so as to cross one another to thereby form a capacitive sensing panel. A single connector is mechanically coupled to the first portion or the second portion, and electrically coupled to the first portion and the second portion but not electrically coupling the first portion to the second portion.Type: ApplicationFiled: June 24, 2016Publication date: December 28, 2017Applicant: STMicroelectronics Asia Pacific Pte LtdInventors: Kusuma Adi Ningrat, Giuseppe Noviello, John Serge Georges Nankoo
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Patent number: 9846520Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.Type: GrantFiled: June 7, 2017Date of Patent: December 19, 2017Assignee: STMicroelectronics Asia Pacific Pte LtdInventors: Praveesh Chandran, Baranidharan Karuppusamy, Giuseppe Noviello, Chee Weng Cheong, Leonard Dinu, Dianbo Guo, Kien Beng Tan, Chaochao Zhang
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Patent number: 9846665Abstract: A master-slave circuit is disclosed that maintains synchronization between two integrated circuit chips, using minimal chip resources. In one embodiment, a single, bidirectional communication path is shared by the two chips. Meanwhile, only one I/O port on each chip is used to send and receive signals via the bidirectional communication path. The first chip to detect a signal event is designated the master and controls the bidirectional communication path. The master can communicate the status to the other chip by controlling the logic state of the I/O ports. When the second chip detects that the I/O port is controlled by the first chip, the second chip will logically deduce that it is now the slave. If both chips detect the signal event at substantially the same time, one of the two chips is pre-programmed to assume control of the I/O port as the master.Type: GrantFiled: November 5, 2014Date of Patent: December 19, 2017Assignee: STMICROELECTRONICS ASIA PACIFIC PTE LTDInventors: Chaochao Zhang, Chee Weng Cheong, Dianbo Guo
