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公开(公告)号：US11081034B2
公开(公告)日：2021-08-03
申请号：US16828971
申请日：2020-03-25
Applicant: NOVATEK Microelectronics Corp.
Inventor： Yun-Hsuan Yeh , Tai-Yin Wu , Ying-Hsiang Wang , Yao-Hung Kuo
Abstract: The present invention provides a driving circuit for a gamma voltage generator of a source driver. The gamma voltage generator includes a resistor string having a plurality of tap nodes, among which a plurality of first tap nodes are respectively connected to a plurality of first buffers. The driving circuit includes a second buffer, a digital-to-analog converter (DAC) and a control circuit. The second buffer is connected to a second tap node other than the plurality of first tap nodes among the plurality of tap nodes. The DAC is coupled to the second buffer. The control circuit, coupled to the DAC, is configured to receive a plurality of first control signals for the plurality of first buffers and calculate a second control signal for the DAC according to the plurality of first control signals.
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公开(公告)号：US20210050830A1
公开(公告)日：2021-02-18
申请号：US16935174
申请日：2020-07-21
Applicant: NOVATEK Microelectronics Corp.
Inventor： Ying-Hsiang Wang , Tsung-Hau Chang , Jung-Hsing Liao
IPC: H03F3/45
Abstract: An operational amplifier includes a first differential input pair, a first switch and a second switch. The first differential input pair includes a first input transistor and a second input transistor. The first input transistor has a gate terminal coupled to an output terminal of the operational amplifier. The second input transistor has a gate terminal. The first switch is coupled between the gate terminal of the first input transistor and the gate terminal of the second input transistor. The second switch is coupled between a first input terminal of the operational amplifier and the gate terminal of the second input transistor.
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公开(公告)号：US20160211755A1
公开(公告)日：2016-07-21
申请号：US14715620
申请日：2015-05-19
Applicant: NOVATEK Microelectronics Corp.
Inventor： Ke-Horng Chen , Chao-Chang Chiu , Hao-Yuan Lin , Che-Hao Meng , Chih-Wei Chang , Ying-Hsiang Wang
CPC classification number: H02M3/33507 , G01R19/10 , H02M3/3353
Abstract: A knee voltage detector for a flyback converter is provided. The knee voltage detector comprises a delay unit, for delaying an auxiliary related voltage for a specific period, to generate a delay signal; a subtracting unit, for generating a subtraction signal according to the auxiliary related voltage and the delay signal; a comparing unit, for generating a sampling signal when the subtraction signal indicates that a voltage difference between the auxiliary related voltage and the delay signal is greater than a threshold; and a sample and hold unit, for sampling the delay signal to generate a knee voltage according to the sampling signal when the voltage difference between the auxiliary related voltage and the delay signal is greater than the threshold.
Abstract translation: 提供了一种用于回扫转换器的膝盖电压检测器。 所述膝盖电压检测器包括延迟单元，用于延迟辅助相关电压达一段特定周期，以产生延迟信号; 减法单元，用于根据所述辅助相关电压和所述延迟信号产生减法信号; 比较单元，用于当减法信号指示辅助相关电压和延迟信号之间的电压差大于阈值时产生采样信号; 以及采样保持单元，用于当辅助相关电压和延迟信号之间的电压差大于阈值时，根据采样信号采样延迟信号以产生拐点电压。
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公开(公告)号：US20150117070A1
公开(公告)日：2015-04-30
申请号：US14184648
申请日：2014-02-19
Applicant: Novatek Microelectronics Corp.
Inventor： Ying-Hsiang Wang , Che-Li Lin , Chih-Jen Yen
IPC: H02M3/335
CPC classification number: H02M3/33561 , H02M3/335 , H02M3/33569 , H02M3/33576 , H02M3/33592 , H02M2001/0006
Abstract: An AC-DC converting apparatus and operating method are provided. The AC-DC converting apparatus includes a transformer, a first energy storage unit, a first output switch, a second energy storage unit, a second output switch and a secondary-side control module. The transformer includes a primary-side winding and a secondary-side winding. The first output switch is coupled between the secondary-side winding and the first energy storage unit. The second output switch is coupled between the secondary-side winding and the second energy storage unit. The secondary-side control module monitors the first energy storage unit and the second energy storage unit, and decides time length of a conduction period of the first output switch and the second output switch according to the monitoring result.
Abstract translation: 提供AC-DC转换装置和操作方法。 AC-DC转换装置包括变压器，第一能量存储单元，第一输出开关，第二能量存储单元，第二输出开关和次级侧控制模块。 变压器包括初级侧绕组和次级侧绕组。 第一输出开关耦合在次级侧绕组和第一能量存储单元之间。 第二输出开关耦合在次级侧绕组和第二能量存储单元之间。 次级侧控制模块监视第一能量存储单元和第二能量存储单元，并且根据监视结果确定第一输出开关和第二输出开关的导通周期的时间长度。
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公开(公告)号：US11199565B1
公开(公告)日：2021-12-14
申请号：US16932563
申请日：2020-07-17
Applicant: NOVATEK MICROELECTRONICS CORP.
Inventor： Ying-Hsiang Wang , Jung-Hsing Liao
Abstract: An undervoltage detection circuit includes a voltage divider, a voltage-to-current (V-to-I) converter and a current comparator. The voltage divider divides a supply voltage to generate a divided voltage. The V-to-I converter converts the divided voltage into a first current based on a first V-to-I transfer function, and converts the divided voltage into a second current based on a second V-to-I transfer function different from the first V-to-I transfer function. The current comparator compares the first and second currents to generate a comparison signal that indicates whether the supply voltage is sufficiently large.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20200380904A1
公开(公告)日：2020-12-03
申请号：US16828971
申请日：2020-03-25
Applicant: NOVATEK Microelectronics Corp.
Inventor： Yun-Hsuan Yeh , Tai-Yin Wu , Ying-Hsiang Wang , Yao-Hung Kuo
Abstract: The present invention provides a driving circuit for a gamma voltage generator of a source driver. The gamma voltage generator includes a resistor string having a plurality of tap nodes, among which a plurality of first tap nodes are respectively connected to a plurality of first buffers. The driving circuit includes a second buffer, a digital-to-analog converter (DAC) and a control circuit. The second buffer is connected to a second tap node other than the plurality of first tap nodes among the plurality of tap nodes. The DAC is coupled to the second buffer. The control circuit, coupled to the DAC, is configured to receive a plurality of first control signals for the plurality of first buffers and calculate a second control signal for the DAC according to the plurality of first control signals.
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公开(公告)号：US20200152115A1
公开(公告)日：2020-05-14
申请号：US16183746
申请日：2018-11-08
Applicant: NOVATEK Microelectronics Corp.
Inventor： Chao-Kai Tu , Yueh-Hsun Tsai , Tzung-Yun Tsai , Kai-Yue Lin , Ying-Hsiang Wang
IPC: G09G3/20
Abstract: A source driver for a panel includes a plurality of driver cells. Each of the driver cells includes an output driver, a plurality of bias voltage generators and a selector. The output driver is configured to output a plurality of display data to the panel. The plurality of bias voltage generators is coupled to the output driver. Each of the bias voltage generators is configured to provide at least one bias voltage for the output driver. The selector, coupled to the output driver, is configured to select the bias voltage from one of the bias voltage generators to be provided for the output driver according to the plurality of display data.
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公开(公告)号：US11288994B2
公开(公告)日：2022-03-29
申请号：US17117121
申请日：2020-12-10
Applicant: Novatek Microelectronics Corp.
Inventor： Ying-Hsiang Wang , Chia-Lun Chang
IPC: G09G3/20
Abstract: A source driver adapted to drive a display panel is provided. The source driver includes an output buffer and a slew rate adjustment circuit. An input terminal of the output buffer receives a driving voltage. An output terminal of the output buffer outputs an output signal adapted to drive the display panel. The slew rate adjustment circuit dynamically adjusts a slew rate of a rising edge of the output signal according to a first setting and dynamically adjusts a slew rate of a falling edge of the output signal according to a second setting independent of the first setting, such that the adjustment to the slew rate of the rising edge of the output signal is independent of the adjustment to the slew rate of the falling edge of the output signal.
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公开(公告)号：US11120772B1
公开(公告)日：2021-09-14
申请号：US16847589
申请日：2020-04-13
Applicant: NOVATEK Microelectronics Corp.
Inventor： Cheng-Tsu Hsieh , Sou-Chieh Chang , Ying-Hsiang Wang
Abstract: A source driving circuit, a display apparatus and an operation method are provided. The source driving circuit includes a reference voltage generating circuit, a plurality of compensation circuits, a gamma voltage generating circuit and a digital to analog converter. The reference voltage generating circuit is configured to generate a plurality of gamma reference voltages. The plurality of compensation circuits are coupled to the reference voltage generating circuit and configured to generate a plurality of compensated gamma reference voltages according to the plurality of gamma reference voltages and a voltage associated with a common voltage. The gamma voltage generating circuit is configured to generate a plurality of gamma voltages according to the plurality of compensated gamma reference voltages. The digital to analog converter is configured to generate a plurality of data driving voltages corresponding to image data according to the plurality of gamma voltages.
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公开(公告)号：US09570990B2
公开(公告)日：2017-02-14
申请号：US14715620
申请日：2015-05-19
Applicant: NOVATEK Microelectronics Corp.
Inventor： Ke-Horng Chen , Chao-Chang Chiu , Hao-Yuan Lin , Che-Hao Meng , Chih-Wei Chang , Ying-Hsiang Wang
CPC classification number: H02M3/33507 , G01R19/10 , H02M3/3353
Abstract: A knee voltage detector for a flyback converter is provided. The knee voltage detector comprises a delay unit, for delaying an auxiliary related voltage for a specific period, to generate a delay signal; a subtracting unit, for generating a subtraction signal according to the auxiliary related voltage and the delay signal; a comparing unit, for generating a sampling signal when the subtraction signal indicates that a voltage difference between the auxiliary related voltage and the delay signal is greater than a threshold; and a sample and hold unit, for sampling the delay signal to generate a knee voltage according to the sampling signal when the voltage difference between the auxiliary related voltage and the delay signal is greater than the threshold.
Abstract translation: 提供了一种用于回扫转换器的膝盖电压检测器。 所述膝盖电压检测器包括延迟单元，用于延迟辅助相关电压达一段特定周期，以产生延迟信号; 减法单元，用于根据所述辅助相关电压和所述延迟信号产生减法信号; 比较单元，用于当减法信号指示辅助相关电压和延迟信号之间的电压差大于阈值时产生采样信号; 以及采样保持单元，用于当辅助相关电压和延迟信号之间的电压差大于阈值时，根据采样信号采样延迟信号以产生拐点电压。
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