公开(公告)号：US20130082603A1

公开(公告)日：2013-04-04

申请号：US13686923

申请日：2012-11-28

Applicant: NOVATEK Microelectronics Corp.

Inventor： Kuo-Ching Hsu ,  Chin-Hsun Hsu ,  Tsung-Hau Chang ,  Ting-Wei Liao

IPC: H05B37/03

CPC classification number: H05B37/036 ,  H05B33/0815 ,  H05B33/0827 ,  H05B33/0893

Abstract: An LED device with simultaneous open and short detection function includes a plurality of LED strings, a voltage converter, a current driving unit, a loop control unit and an open and short detector. The open and short detector is utilized for performing LED open and LED short detection on the plurality of LED strings according to negative electrode voltages of the plurality of LED strings and a level variation trend of a second voltage converted from a first voltage by the voltage converter.

Abstract translation: 具有同时开路和短路检测功能的LED装置包括多个LED串，电压转换器，电流驱动单元，环路控制单元和开放和短路检测器。 所述开路和短路检测器用于根据所述多个LED串的负电极电压对所述多个LED串进行LED开路和LED短路检测，以及由所述电压转换器从第一电压转换的第二电压的电平变化趋势 。

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.

公开(公告)号：US10902767B1

公开(公告)日：2021-01-26

申请号：US16726962

申请日：2019-12-26

Applicant: NOVATEK Microelectronics Corp.

Inventor： Tsung-Hau Chang ,  Chi-Wei Liu ,  Ping Chen

IPC: G09G3/20

Abstract: A driving circuit of display apparatus includes an operational amplifier (OP), comprising a plurality of input terminals; a digital-to-analog converter (DAC); a multiplexer, coupled to the OP and the DAC, comprising a plurality of switches; and a boosting module, configured to decrease an equivalent time constant between the DAC and the OP to increase an output slew rate of the OP in a boosting period; wherein the boosting period is enabled before a steady state of the OP.

公开(公告)号：US20140042917A1

公开(公告)日：2014-02-13

申请号：US14058951

申请日：2013-10-21

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Hsing-Chien YANG ,  Wen-Hsin Cheng ,  Ying-Hao Hsu ,  Lan-Ting Hsu ,  Tsung-Hau Chang

IPC: H05B33/08

CPC classification number: H05B33/0806 ,  H05B33/0818 ,  H05B33/0845

Abstract: A light-emitting diode (LED) driving circuit includes an LED control circuit and a power stage circuit. The LED control circuit shifts an input pulse width modulation (PWM) signal toward a higher frequency direction in a frequency domain to generate an output PWM signal having a duty cycle substantially the same as a duty cycle of the input PWM signal. The power stage circuit outputs an LED driving current according to the output PWM signal.

Abstract translation: 发光二极管（LED）驱动电路包括LED控制电路和功率级电路。 LED控制电路在频域中将输入脉宽调制（PWM）信号向较高频率方向移位，以产生具有与输入PWM信号的占空比基本相同的占空比的输出PWM信号。 功率级电路根据输出PWM信号输出LED驱动电流。

公开(公告)号：US11581861B2

公开(公告)日：2023-02-14

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.

公开(公告)号：US09119249B2

公开(公告)日：2015-08-25

申请号：US14058951

申请日：2013-10-21

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Hsing-Chien Yang ,  Wen-Hsin Cheng ,  Ying-Hao Hsu ,  Lan-Ting Hsu ,  Tsung-Hau Chang

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0806 ,  H05B33/0818 ,  H05B33/0845

Abstract: A light-emitting diode (LED) driving circuit includes an LED control circuit and a power stage circuit. The LED control circuit shifts an input pulse width modulation (PWM) signal toward a higher frequency direction in a frequency domain to generate an output PWM signal having a duty cycle substantially the same as a duty cycle of the input PWM signal. The power stage circuit outputs an LED driving current according to the output PWM signal.

Abstract translation: 发光二极管（LED）驱动电路包括LED控制电路和功率级电路。 LED控制电路在频域中将输入脉宽调制（PWM）信号向较高频率方向移位，以产生具有与输入PWM信号的占空比基本相同的占空比的输出PWM信号。 功率级电路根据输出PWM信号输出LED驱动电流。

公开(公告)号：USRE46330E1

公开(公告)日：2017-02-28

申请号：US14693890

申请日：2015-04-23

Applicant: Novatek Microelectronics Corp.

Inventor： Kuo-Ching Hsu ,  Chin-Hsun Hsu ,  Tsung-Hau Chang ,  Ting-Wei Liao

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0818 ,  H05B33/0827

Abstract: A driving method of a light-emitting diode (LED) adapted to a driving apparatus is provided. The driving method includes detecting whether the driving apparatus performs dimming, and if the driving apparatus performs dimming, determining whether a predetermined requirement for dimming control is met or not. When the predetermined requirement for dimming control is not met, respective current magnitudes of a plurality of driving currents are regulated, and each of the driving currents is output for a full time of a period. Conversely, when the predetermined requirement for dimming control is met, each of the driving currents is output for a partial time of a period.

Abstract translation: 提供了适用于驱动装置的发光二极管（LED）的驱动方法。 驱动方法包括检测驱动装置是否进行调光，并且如果驱动装置进行调光，则确定是否满足了对调光控制的预定要求。 当不满足调光控制的预定要求时，调节多个驱动电流的各自的电流大小，并且每个驱动电流输出一段时间的全时间。 相反，当满足调光控制的预定要求时，每个驱动电流输出一段时间的部分时间。