Patents by Inventor Kenichi Shiibayashi
Kenichi Shiibayashi 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).
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Patent number: 11862070Abstract: A source driver includes: a first gradation voltage generation unit generating a gradation voltage of a first polarity supplied to a pixel on a first source line; a first amplifier receiving the gradation voltage of the first polarity to an input end, amplifying it, and outputting a voltage from an output end; a second gradation voltage generation unit generating a gradation voltage of a second polarity opposite to the first polarity to be supplied to a pixel on a second source line provided in the vicinity of the first source line; a second amplifier receiving the gradation voltage of the second polarity to an input end, amplifying it, and outputting a voltage from an output end; and a voltage comparison unit comparing a voltage of the input end of the second amplifier with the voltage of the output end of the second amplifier and outputs a comparison result.Type: GrantFiled: March 13, 2022Date of Patent: January 2, 2024Assignee: LAPIS Technology Co., Ltd.Inventors: Kenichi Shiibayashi, Kenichi Shigeta
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Patent number: 11741915Abstract: The disclosure includes bus wiring constituted by wiring lines; a gradation voltage generation circuit that generates M gradation voltages representing brightness levels with M gradations, and applies the M gradation voltages to an intermediate portion on M wiring lines belonging to the bus wiring; a plurality of decoders, each of which receives M gradation voltages via the M wiring lines and selects one of the M gradation voltages according to the pixel data pieces to output the selected gradation voltage; a plurality of output amplifiers that individually amplifies the voltages output from the plurality of decoders and generates the amplified voltages as the plurality of pixel drive voltages; and first and second inter-gradation short circuits that short-circuit one ends of each of the M wiring lines and the other ends of each of the M wiring lines according to a load signal for capturing the pixel data pieces.Type: GrantFiled: May 31, 2022Date of Patent: August 29, 2023Assignee: LAPIS Semiconductor Co., Ltd.Inventors: Kenichi Shiibayashi, Keigo Otani
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Publication number: 20230260476Abstract: A ladder resistor circuit includes a ladder resistor including first to k-th resistors connected in series and outputting a plurality of voltages by receiving a first potential and a second potential, a first correction resistor that has a resistance value equal to a series total resistance value of a resistor group constituted of first to r-th resistors among the first to k-th resistors, a second correction resistor that has a resistance value equal to a series total resistance value of a resistor group constituted of (r+1)-th to k-th resistors, and an amplifier that receives a potential of a connection point between the first and second correction resistors at an input terminal thereof, and has an output terminal thereof connected to a connection point between the r-th and (r+1)-th resistors.Type: ApplicationFiled: February 10, 2023Publication date: August 17, 2023Applicant: LAPIS Technology Co., Ltd.Inventor: Kenichi SHIIBAYASHI
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Publication number: 20220319403Abstract: A source driver includes: a first gradation voltage generation unit generating a gradation voltage of a first polarity supplied to a pixel on a first source line; a first amplifier receiving the gradation voltage of the first polarity to an input end, amplifying it, and outputting a voltage from an output end; a second gradation voltage generation unit generating a gradation voltage of a second polarity opposite to the first polarity to be supplied to a pixel on a second source line provided in the vicinity of the first source line; a second amplifier receiving the gradation voltage of the second polarity to an input end, amplifying it, and outputting a voltage from an output end; and a voltage comparison unit comparing a voltage of the input end of the second amplifier with the voltage of the output end of the second amplifier and outputs a comparison result.Type: ApplicationFiled: March 13, 2022Publication date: October 6, 2022Applicant: LAPIS Technology Co., Ltd.Inventors: Kenichi SHIIBAYASHI, Kenichi SHIGETA
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Publication number: 20220293063Abstract: The disclosure includes bus wiring constituted by wiring lines; a gradation voltage generation circuit that generates M gradation voltages representing brightness levels with M gradations, and applies the M gradation voltages to an intermediate portion on M wiring lines belonging to the bus wiring; a plurality of decoders, each of which receives M gradation voltages via the M wiring lines and selects one of the M gradation voltages according to the pixel data pieces to output the selected gradation voltage; a plurality of output amplifiers that individually amplifies the voltages output from the plurality of decoders and generates the amplified voltages as the plurality of pixel drive voltages; and first and second inter-gradation short circuits that short-circuit one ends of each of the M wiring lines and the other ends of each of the M wiring lines according to a load signal for capturing the pixel data pieces.Type: ApplicationFiled: May 31, 2022Publication date: September 15, 2022Applicant: LAPIS Semiconductor Co., Ltd.Inventors: Kenichi SHIIBAYASHI, KEIGO OTANI
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Publication number: 20220246109Abstract: A voltage generation unit includes first to k-th amplifiers that individually receiving first to k-th reference voltages having mutually different voltage values, individually amplify these reference voltages with gain 1, and output the reference voltages. The generation unit generates plural gradation voltages by dividing voltages between respective voltages output from the first to k-th amplifiers. A decoder unit selects one gradation voltage corresponding to the luminance level represented by the pixel data piece among the gradation voltages and generates a signal having the one gradation voltage as the drive signal for driving a display device. Each amplifier includes a response-speed increase circuit that includes at least one transistor in which a source and a back gate are connected to an output terminal of the amplifier, a predetermined electric potential is applied to a drain, and the reference voltage received by the amplifier is received at a gate.Type: ApplicationFiled: June 17, 2020Publication date: August 4, 2022Applicant: LAPIS Semiconductor Co., Ltd.Inventor: Kenichi SHIIBAYASHI
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Patent number: 11373616Abstract: The disclosure includes bus wiring constituted by wiring lines; a gradation voltage generation circuit that generates M gradation voltages representing brightness levels with M gradations, and applies the M gradation voltages to an intermediate portion on M wiring lines belonging to the bus wiring; a plurality of decoders, each of which receives M gradation voltages via the M wiring lines and selects one of the M gradation voltages according to the pixel data pieces to output the selected gradation voltage; a plurality of output amplifiers that individually amplifies the voltages output from the plurality of decoders and generates the amplified voltages as the plurality of pixel drive voltages; and first and second inter-gradation short circuits that short-circuit one ends of each of the M wiring lines and the other ends of each of the M wiring lines according to a load signal for capturing the pixel data pieces.Type: GrantFiled: December 3, 2020Date of Patent: June 28, 2022Assignee: LAPIS Semiconductor Co., Ltd.Inventors: Kenichi Shiibayashi, Keigo Otani
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Patent number: 11094272Abstract: A display driver according to the present invention includes a withstand voltage protection part that precharges an output node of a polarity changeover switch circuit that switches a polarity of a drive signal supplied to a display device from an electric potential of a positive polarity (a first electric potential to a third electric potential) to an electric potential of a negative polarity (the third electric potential to a second electric potential) or vice versa to the third electric potential immediately before the polarity switching.Type: GrantFiled: July 7, 2020Date of Patent: August 17, 2021Assignee: LAPIS SEMICONDUCTOR CO., LTD.Inventor: Kenichi Shiibayashi
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Publication number: 20210174760Abstract: The disclosure includes bus wiring constituted by wiring lines; a gradation voltage generation circuit that generates M gradation voltages representing brightness levels with M gradations, and applies the M gradation voltages to an intermediate portion on M wiring lines belonging to the bus wiring; a plurality of decoders, each of which receives M gradation voltages via the M wiring lines and selects one of the M gradation voltages according to the pixel data pieces to output the selected gradation voltage; a plurality of output amplifiers that individually amplifies the voltages output from the plurality of decoders and generates the amplified voltages as the plurality of pixel drive voltages; and first and second inter-gradation short circuits that short-circuit one ends of each of the M wiring lines and the other ends of each of the M wiring lines according to a load signal for capturing the pixel data pieces.Type: ApplicationFiled: December 3, 2020Publication date: June 10, 2021Applicant: LAPIS Semiconductor Co., Ltd.Inventors: Kenichi SHIIBAYASHI, KEIGO OTANI
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Publication number: 20210012731Abstract: A display driver according to the present invention includes a withstand voltage protection part that precharges an output node of a polarity changeover switch circuit that switches a polarity of a drive signal supplied to a display device from an electric potential of a positive polarity (a first electric potential to a third electric potential) to an electric potential of a negative polarity (the third electric potential to a second electric potential) or vice versa to the third electric potential immediately before the polarity switching.Type: ApplicationFiled: July 7, 2020Publication date: January 14, 2021Applicant: LAPIS Semiconductor Co., Ltd.Inventor: Kenichi SHIIBAYASHI
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Patent number: 10650771Abstract: Provided is an output amplifier including a differential unit which sends a current corresponding to a voltage difference between a gradation voltage and an amplified gradation voltage to a first current line; a current mirror unit which sends an amount of current corresponding to the current flowing through the first current line, to a second current line; and an output unit including a first and a second drive line, an output line through which the amplified gradation voltage is output, a first output transistor which sends a current based on a voltage of the first drive line, and a second output transistor which sends a current based on a voltage of the second drive line. The output unit includes a voltage regulation circuit which controls the voltage of the first drive line being higher than the voltage of the second drive line.Type: GrantFiled: July 3, 2018Date of Patent: May 12, 2020Assignee: LAPIS SEMICONDUCTOR CO., LTD.Inventor: Kenichi Shiibayashi
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Patent number: 10607560Abstract: A semiconductor device for driving a load of an object includes a differential circuit receiving an input signal and outputting differential output signals, first to fourth output circuits receiving the differential output signals, and a control circuit configured to respectively connect or disconnect the differential circuit to each of the first to fourth output circuits. The first output circuit is connected between high-level and mid-level power supply terminals and outputs a first output signal to the differential circuit, the second output circuit is connected between the high-level and mid-level power supply terminals, and outputs a second output signal to the load, a third output circuit is connected between mid-level and low-level power supply terminals, and outputs a third output signal to the differential circuit, and a fourth output circuit is connected between the mid-level low-level power supply terminals, and outputs a fourth output signal to the load.Type: GrantFiled: May 17, 2018Date of Patent: March 31, 2020Assignee: LAPIS SEMICONDUCTOR CO., LTD.Inventors: Hiroshi Tsuchi, Kenichi Shiibayashi
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Patent number: 10446109Abstract: A display driver includes: a plurality of decoders that converts a plurality of pixel data pieces representing luminance levels for pixels into gradation voltages having magnitudes corresponding to the luminance levels represented by the pixel data pieces, respectively; a plurality of amplifiers that provides a plurality of driving voltages obtained by amplifying the gradation voltages to a plurality of data lines of a display device, respectively; and a reference gradation voltage generator that generates a plurality of reference gradation voltages having respective different voltage values corresponding to gradation levels. Each of the decoders includes a short-circuiting control circuit that controls whether to short-circuit between a first line and a second line of each of the decoders.Type: GrantFiled: August 30, 2017Date of Patent: October 15, 2019Assignee: LAPIS Semiconductor Co., Ltd.Inventor: Kenichi Shiibayashi
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Patent number: 10290279Abstract: An amplifier feeds a current corresponding to a difference between a gradation voltage corresponding to a luminance level in a video signal and an amplified gradation voltage obtained by amplifying such a gradation voltage through an output current line in a current mirror circuit, and provides a voltage on the output current line to an output part via a driving line. The output part generates the amplified gradation voltage on the output line by feeding a current according to a voltage on the driving line through the output line.Type: GrantFiled: August 3, 2018Date of Patent: May 14, 2019Assignee: LAPIS Semiconductor Co., Ltd.Inventor: Kenichi Shiibayashi
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Patent number: 10199000Abstract: A source driver IC chip, designed to prevent flicker in images displayed on a display panel while suppressing power consumption and heat generation, includes: a reference gradation voltage generating part (220) configured to generate a reference gradation voltage based on a first or second gamma characteristic of the display panel, using first and second power supply voltages (VH) and (VL) inputted through first and second external terminals (PA2, PA3); and a third external terminal (PA4) for externally outputting said reference gradation voltage. The source driver IC chip further includes first and second gradation voltage generating parts configured to generate first and second gradation voltages respectively, using a reference gradation voltage based on a first gamma characteristic inputted through a fourth external terminal and a reference gradation voltage having a second gamma characteristic inputted through a fifth external terminal respectively.Type: GrantFiled: December 30, 2016Date of Patent: February 5, 2019Assignee: LAPIS Semiconductor Co., Ltd.Inventors: Kenichi Shiibayashi, Koji Higuchi, Atsushi Hirama
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Publication number: 20190012980Abstract: Provided is an output amplifier including a differential unit which sends a current corresponding to a voltage difference between a gradation voltage and an amplified gradation voltage to a first current line; a current mirror unit which sends an amount of current corresponding to the current flowing through the first current line, to a second current line; and an output unit including a first and a second drive line, an output line through which the amplified gradation voltage is output, a first output transistor which sends a current based on a voltage of the first drive line, and a second output transistor which sends a current based on a voltage of the second drive line. The output unit includes a voltage regulation circuit which controls the voltage of the first drive line being higher than the voltage of the second drive line.Type: ApplicationFiled: July 3, 2018Publication date: January 10, 2019Applicant: LAPIS Semiconductor Co., Ltd.Inventor: Kenichi SHIIBAYASHI
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Publication number: 20180342223Abstract: An amplifier feeds a current corresponding to a difference between a gradation voltage corresponding to a luminance level in a video signal and an amplified gradation voltage obtained by amplifying such a gradation voltage through an output current line in a current mirror circuit, and provides a voltage on the output current line to an output part via a driving line. The output part generates the amplified gradation voltage on the output line by feeding a current according to a voltage on the driving line through the output line.Type: ApplicationFiled: August 3, 2018Publication date: November 29, 2018Applicant: LAPIS Semiconductor Co., Ltd.Inventor: Kenichi SHIIBAYASHI
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Publication number: 20180336862Abstract: A semiconductor device for driving a load of an object includes a differential circuit receiving an input signal and outputting differential output signals, first to fourth output circuits receiving the differential output signals, and a control circuit configured to respectively connect or disconnect the differential circuit to each of the first to fourth output circuits. The first output circuit is connected between high-level and mid-level power supply terminals and outputs a first output signal to the differential circuit, the second output circuit is connected between the high-level and mid-level power supply terminals, and outputs a second output signal to the load, a third output circuit is connected between mid-level and low-level power supply terminals, and outputs a third output signal to the differential circuit, and a fourth output circuit is connected between the mid-level low-level power supply terminals, and outputs a fourth output signal to the load.Type: ApplicationFiled: May 17, 2018Publication date: November 22, 2018Applicant: LAPIS Semiconductor Co., Ltd.Inventors: Hiroshi TSUCHI, Kenichi SHIIBAYASHI
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Patent number: 10062351Abstract: An amplifier feeds a current corresponding to a difference between a gradation voltage corresponding to a luminance level in a video signal and an amplified gradation voltage obtained by amplifying such a gradation voltage through an output current line in a current mirror circuit, and provides a voltage on the output current line to an output part via a driving line. The output part generates the amplified gradation voltage on the output line by feeding a current according to a voltage on the driving line through the output line.Type: GrantFiled: November 17, 2016Date of Patent: August 28, 2018Assignee: LAPIS Semiconductor Co., Ltd.Inventor: Kenichi Shiibayashi
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Publication number: 20180061359Abstract: A display driver includes: a plurality of decoders that converts a plurality of pixel data pieces representing luminance levels for pixels into gradation voltages having magnitudes corresponding to the luminance levels represented by the pixel data pieces, respectively; a plurality of amplifiers that provides a plurality of driving voltages obtained by amplifying the gradation voltages to a plurality of data lines of a display device, respectively; and a reference gradation voltage generator that generates a plurality of reference gradation voltages having respective different voltage values corresponding to gradation levels.Type: ApplicationFiled: August 30, 2017Publication date: March 1, 2018Applicant: LAPIS Semiconductor Co., Ltd.Inventor: Kenichi SHIIBAYASHI