公开(公告)号：US10939524B1

公开(公告)日：2021-03-02

申请号：US15904260

申请日：2018-02-23

Applicant: IML International

Inventor： Alberto Viviani

IPC: H05B45/37 ,  G02F1/13357 ,  H05B45/46

Abstract: A backlight driver includes current sources that are connected between LED strings and a number of bias voltages. There can be any number of different bias voltages, each at a ground potential or higher voltage. The bias voltage is selected for a particular LED string in order to reduce a current drop across the current source. This reduces the power consumption of the current source and LED string. Heat dissipation is also reduced.

公开(公告)号：US10237932B1

公开(公告)日：2019-03-19

申请号：US16057782

申请日：2018-08-07

Applicant: IML International

Inventor： Horng-Bin Hsu ,  Yi-Mei Li ,  Yung-Hsin Chiang

IPC: H05B33/08

Abstract: An LED lighting system includes a luminescent unit driven by a rectified AC voltage, a dimmer switch configured to adjusting a duty cycle of a system current, and a bleeder circuit. The bleeder circuit includes a first current source, a second current source, a third current source, a current-sensing element for providing a first feedback voltage associated with the system current, a capacitor, and a control unit. The control unit is configured to activate the first current source and deactivate the second current source for charging the capacitor when the system current exceeds a predetermined threshold, deactivate the first current source and activate the second current source for discharging the capacitor when the system current does not exceed the predetermined threshold, and deactivate the third current source to stop supplying the bleeder current according to a second feedback voltage established across the capacitor.

公开(公告)号：US10056025B2

公开(公告)日：2018-08-21

申请号：US15299317

申请日：2016-10-20

Applicant: IML International

Inventor： Yoo Dong Jo ,  Omeshwar Suryakant Lawange

IPC: G09G3/20 ,  G09G3/36 ,  G09G5/00

CPC classification number: G09G3/2092 ,  G09G3/3648 ,  G09G3/3655 ,  G09G3/3696 ,  G09G5/008 ,  G09G5/18 ,  G09G2320/0219 ,  G09G2320/0247 ,  G09G2330/028 ,  G09G2340/0435

Abstract: A variable Vcom level generator circuit generates a variable Vcom voltage level. A variable Vcom voltage can be used for variable refresh rate display technology to prevent flicker on a display panel. The Vcom level can be changed based on the vertical frequency being used or can be changed based on external control signals.

公开(公告)号：US09916799B1

公开(公告)日：2018-03-13

申请号：US15295814

申请日：2016-10-17

Applicant: IML International

Inventor： Yoo Dong Jo ,  Gi Young Lee

IPC: G09G3/36 ,  G09G5/39

CPC classification number: G09G3/3618 ,  G09G3/2092 ,  G09G3/3648 ,  G09G3/3685 ,  G09G3/3696 ,  G09G5/008 ,  G09G5/39 ,  G09G2310/0264 ,  G09G2310/027 ,  G09G2310/0289 ,  G09G2310/0291 ,  G09G2310/08 ,  G09G2320/0247 ,  G09G2340/0435 ,  G09G2360/12

Abstract: An adaptive Vcom level generator circuit generates a variable Vcom voltage level. A variable Vcom voltage can be used for variable refresh rate display technology to prevent flicker on a display panel. The Vcom level can be changed based on the vertical frequency being used or can be changed based on external control signals.

公开(公告)号：US09754550B1

公开(公告)日：2017-09-05

申请号：US15408325

申请日：2017-01-17

Applicant: IML International

Inventor： Alberto Giovanni Viviani ,  ChinFa Kao ,  Chiayao S. Tung

IPC: H03K3/00 ,  G09G3/36 ,  H03K3/012

CPC classification number: G09G3/3696 ,  G09G3/3611 ,  G09G3/3614 ,  G09G3/3655 ,  G09G2310/027 ,  G09G2320/0247 ,  H01L25/50 ,  H03K3/01 ,  H03K3/012 ,  H03K5/13

Abstract: One or more resistors or resistances are integrated in a 7-bit DVR or PVCOM integrated circuit. A 7-bit DVR or PVCOM integrated circuit includes a 7-bit DAC. The integrated resistors or resistances (R1, R2, or RSET, or any combination) reduces the number of external components, reduces the number of pins, and increases the accuracy of the DVR or PVCOM circuit. The least significant bit (LSB) of the DAC depends only on ratios of internal resistors, which can be made very accurate and independent of temperature.

公开(公告)号：US09478188B1

公开(公告)日：2016-10-25

申请号：US14978784

申请日：2015-12-22

Applicant: IML International

Inventor： Jonathan Chang

IPC: G09G3/36 ,  H03M1/66 ,  H03K19/00

CPC classification number: G09G3/3696 ,  G09G3/3655 ,  G09G2300/0876 ,  H03K19/0005 ,  H03M1/66 ,  H03M1/682 ,  H03M1/765

Abstract: A digitally controlled voltage generator is disclosed for use in applications requiring fine resolution voltage control, such as generating a common voltage for a liquid crystal display. A constant resistance digital to analog converter (DAC) is configured to provide appropriate voltage steps by tuning bias resistors to generate desirable reference voltages for the DAC. The bias resistors are configured to be tuned after placement and routing steps in an integrated circuit design.

公开(公告)号：US09351363B1

公开(公告)日：2016-05-24

申请号：US14872116

申请日：2015-09-30

Applicant: IML International

Inventor： Horng-Bin Hsu ,  Yung-Hsin Chiang

IPC: H05B31/00 ,  H05B33/08

CPC classification number: H05B33/083

Abstract: An LED lighting device includes first and second luminescent units, first and second current controllers, a line voltage sensing unit and a mode control unit. The first current controller with a first current setting is selectively coupled to the first luminescent unit according to a sensing voltage associated a range of the rectified AC voltage. The second current controller with a second current setting is coupled in series to the second luminescent unit. The line voltage sensing unit is configured to detect the sensing voltage. The mode control unit is configured to operate the LED lighting device in a first driving mode when detecting that the rectified AC voltage is within a first AC range and operate the LED lighting device in a second driving mode when detecting that the rectified AC voltage is within a second AC range.

Abstract translation: LED照明装置包括第一和第二发光单元，第一和第二电流控制器，线路电压感测单元和模式控制单元。 根据与整流的AC电压的范围相关联的感测电压，具有第一电流设置的第一电流控制器选择性地耦合到第一发光单元。 具有第二电流设置的第二电流控制器与第二发光单元串联耦合。 线路电压感测单元被配置为检测感测电压。 模式控制单元被配置为当检测到整流的AC电压处于第一AC范围内时以第一驱动模式操作LED照明装置，并且当检测到整流的AC电压在内部时，以第二驱动模式操作LED照明装置 第二个交流范围。

公开(公告)号：US20140354164A1

公开(公告)日：2014-12-04

申请号：US14277029

申请日：2014-05-13

Applicant: IML International

Inventor： Horng-Bin Hsu ,  Yi-Mei Li ,  Yung-Hsin Chiang

IPC: H05B33/08

CPC classification number: H05B33/083 ,  Y02B20/345 ,  Y02B20/348

Abstract: An LED lighting device includes a slave driving stage and a master driving stage. The slave driving stage includes a first luminescent device and a first current controller for providing a constant current setting in an ON phase. The master driving stage includes a second luminescent device and a current control unit having a second current controller and a current envelope controller. The second current controller provides a current envelope in the ON phase. The current envelope controller sets a level of the current envelope according to a rectified AC voltage. The driving current is regulated by the first current controller according to the constant current setting when the constant current setting is smaller than the level of the current envelope, or by the second current controller according to the current envelope when the level of the current envelope is smaller than the constant current setting.

Abstract translation: LED照明装置包括从动驱动级和主驱动级。 从动驱动级包括第一发光装置和用于在ON阶段提供恒定电流设定的第一电流控制器。 主驱动级包括第二发光装置和具有第二电流控制器和电流包络控制器的电流控制单元。 第二电流控制器在ON阶段提供电流包络。 电流包络控制器根据整流的交流电压设置电流包络的电平。 当恒定电流设置小于当前包络的电平时，驱动电流由第一电流控制器根据恒定电流设置调节，或者当电流包络线的电平为当前包络时，由第二电流控制器根据当前包络 小于恒定电流设置。

公开(公告)号：US08674609B2

公开(公告)日：2014-03-18

申请号：US13584836

申请日：2012-08-14

Applicant: Yung-Hsin Chiang ,  Yi-Mei Li

Inventor： Yung-Hsin Chiang ,  Yi-Mei Li

IPC: H05B39/00

CPC classification number: H05B33/0824

Abstract: An LED lighting device includes a first luminescent device for providing light according to a first current, a second luminescent device coupled in series to the first luminescent device for providing light according to a second current, an impedance device for limiting the second current within a predetermined range when a voltage established across the first luminescent device and the second luminescent device exceeds a first predetermined value, and a two-terminal current controller coupled in parallel with the first luminescent device and in series to the second luminescent device and configured to regulate the second current according to a voltage established across the two-terminal current controller.

Abstract translation: LED照明装置包括用于根据第一电流提供光的第一发光装置，与第一发光装置串联耦合的第二发光装置，用于根据第二电流提供光;阻抗装置，用于将第二电流限制在预定的 跨越第一发光装置和第二发光装置建立的电压超过第一预定值的两端电流控制器，以及与第一发光装置并联耦合并与第二发光装置串联配置的二端电流控制器， 电流根据两端电流建立的电流控制器。

公开(公告)号：US08288960B2

公开(公告)日：2012-10-16

申请号：US12796674

申请日：2010-06-09

Applicant: Yung-Hsin Chiang ,  Yi-Mei Li

Inventor： Yung-Hsin Chiang ,  Yi-Mei Li

IPC: H05B37/00

CPC classification number: H05B33/0821

Abstract: A two-terminal current controller regulates a first current flowing through a load, which is coupled in parallel with the two-terminal current controller, according to a voltage established across the two-terminal current controller. When the voltage established across the two-terminal current controller does not exceed a first voltage, the two-terminal current controller conducts a second current related to a rectified AC voltage, thereby limiting the first current to zero and regulating the second current according to the load voltage. When the voltage established across the two-terminal current controller is between the first voltage and a second voltage, the two-terminal current controller conducts the second current, thereby limiting the first current to zero and limiting the second current to a constant value larger than zero. When the voltage established across the two-terminal current controller is greater than second voltage, the two-terminal current controller is turned off.

Abstract translation: 两端电流控制器根据两端电流控制器上建立的电压来调节流过负载的第一电流，该负载与两端电流控制器并联耦合。 当跨两端电流控制器建立的电压不超过第一电压时，两端电流控制器传导与整流交流电压相关的第二电流，从而将第一电流限制为零，并根据第 负载电压。 当跨两端电流控制器建立的电压在第一电压和第二电压之间时，两端电流控制器传导第二电流，从而将第一电流限制为零，并将第二电流限制在大于 零。 当两端电流控制器上建立的电压大于第二电压时，两端电流控制器关闭。