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11.发明申请公开(公告)号：US20180046309A1
公开(公告)日：2018-02-15
申请号：US15234243
申请日：2016-08-11
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Abhishek Singh , Hugo Gicquel
CPC classification number: G06F3/0416 , G06F3/044 , H02M3/07
Abstract: 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.
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公开(公告)号：US11294504B2
公开(公告)日：2022-04-05
申请号：US16704212
申请日：2019-12-05
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Yannick Guedon , Leonard Liviu Dinu , Hugo Gicquel
Abstract: A touch screen controller includes an input stage configured to receive and condition a touch output from a touch matrix to produce a touch signal. An accumulation stage is configured to receive the touch signal and accumulate the touch signal to produce an accumulated output. The accumulated output is digitized by an analog to digital converter to produce a touch strength value. A given amount of charge is subtracted from or added to accumulated output during a next accumulation if the touch strength value is greater than an upper threshold or less than a lower threshold. This avoids saturation of components in the touch screen controller and therefore increases the signal to noise ratio.
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公开(公告)号：US11086448B2
公开(公告)日：2021-08-10
申请号：US15378188
申请日：2016-12-14
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Leonard Liviu Dinu , Hugo Gicquel
Abstract: A touch screen controller disclosed herein includes a circuit configured to generate a digital touch voltage comprises of samples, at a base sampling rate. The touch screen controller also includes a digital processing unit configured to analyze a first subset of samples of the digital touch voltage samples to determine noise content thereof, the first subset of samples corresponding to samples at a first investigated sampling rate that is a first function of the base sampling rate. The digital processing unit is also configured to analyze a second subset of samples of the digital touch voltage to determine noise content thereof, with the second subset of samples corresponding to samples at a second investigated sampling rate that is a second function of the base sampling rate, and determine a preferred sampling rate from among the first and second investigated sampling rates as a function of determined noise content thereof.
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公开(公告)号：US10742197B2
公开(公告)日：2020-08-11
申请号：US16200975
申请日：2018-11-27
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Li Cai , Yannick Guedon , Hugo Gicquel
Abstract: An oscillator circuit includes a first current generator circuit that generates a current complementary to absolute temperature and a second current generator that generates a current proportional to absolute temperature. A temperature slope control circuit adjusts slopes of the current complementary to absolute temperature and the current proportional to absolute temperature in a complementary fashion and adds the current complementary to absolute temperature to the current proportional to absolute temperature after slope control to produce a temperature independent current. A current control circuit adjusts magnitude of the temperature independent current to produce a magnitude adjusted temperature independent current. A current controlled oscillator generates an output signal as a function of the magnitude adjusted temperature independent current.
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公开(公告)号：US10585528B2
公开(公告)日：2020-03-10
申请号：US16014664
申请日：2018-06-21
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Hugo Gicquel , Eng Jye Ng
Abstract: A method of differential self-capacitance measurement is used to enhance a signal-to-noise ratio of sense lines in a touch panel display, thereby improving touch sensor accuracy. The differential self-capacitance measurement is implemented for a touch panel using charge sharing between adjacent sense lines of the touch panel matrix. Sequential differential self-capacitance measurements can be compared with one another by computing the difference |CS1−CS2|−|CS2−CS1| to sense a change caused by an intervening event. By scanning the entire touch panel matrix, events can be tracked across the touch panel.
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Patent Agency Ranking
公开(公告)号：US10191589B2
公开(公告)日：2019-01-29
申请号：US15235974
申请日：2016-08-12
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Hugo Gicquel , Chee Weng Cheong
Abstract: 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.
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公开(公告)号：US10146363B2
公开(公告)日：2018-12-04
申请号：US15234243
申请日：2016-08-11
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Abhishek Singh , Hugo Gicquel
Abstract: 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.
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18.发明申请公开(公告)号：US20180341362A1
公开(公告)日：2018-11-29
申请号：US16057062
申请日：2018-08-07
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Abhishek Singh , Hugo Gicquel
CPC classification number: G06F3/0416 , G06F3/044 , H02M3/07
Abstract: 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.
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公开(公告)号：US10078395B2
公开(公告)日：2018-09-18
申请号：US15386249
申请日：2016-12-21
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Hugo Gicquel , Leonard Liviu Dinu
IPC: G06F3/041 , G06F3/044 , H01L27/092
CPC classification number: G06F3/0416 , G06F3/0418 , G06F3/044 , H01L27/092
Abstract: Disclosed herein is an electronic device including a display layer generating display noise based on scanning thereof and a sensing layer including a plurality of sense lines. The display noise is capacitively coupled from the display layer to each of the plurality of sense lines of the sensing layer. A differential charge converter circuit has first and second differential inputs respectively coupled to corresponding ones of the plurality of sense lines, and first and second reference inputs. The first and second reference inputs of the differential charge converter circuit are coupled to voltage references during a reset period, and are decoupled from the voltage references during a scan period.
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公开(公告)号：US20180173365A1
公开(公告)日：2018-06-21
申请号：US15386291
申请日：2016-12-21
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Leonard Liviu Dinu , Hugo Gicquel
Abstract: Disclosed herein is an electronic device including a sensing layer including a plurality of sense lines, and a plurality of single ended charge converter circuits each receiving input from a corresponding one of the plurality of sense lines. The electronic device also includes a plurality of current mirror circuits, each respectively mirroring output from one of the plurality of single ended charge converter circuits so as to produce two substantially identical outputs for each of the plurality of single ended charge converter circuits. There may be a plurality of subtractor circuits coupled to the plurality of current mirror circuits, with each of the plurality of subtractor circuits configured to output a voltage that is a function of a difference between outputs from two of the plurality of current mirror circuits associated with adjacent ones of the sense lines.
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