公开(公告)号：US10665190B2

公开(公告)日：2020-05-26

申请号：US15596496

申请日：2017-05-16

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Seokhwan Lee ,  Jongjae Lee ,  Junki Hong

IPC: G09G3/36

Abstract: A power supply device includes a power circuit, feedback circuit, compensation circuit, and PWM controller. The power circuit generates an output voltage based on a PWM signal. The feedback circuit outputs a feedback voltage. The compensation circuit compares a reference voltage with the feedback voltage and outputs a compensation signal based on a comparison result. The PWM controller adjusts the duty ratio of the PWM signal based on the compensation signal. The compensation circuit includes a comparator to compare the feedback voltage with the reference voltage, a first voltage adjuster to adjust a voltage level of a compensation voltage based on the comparison result, and a compensator output the compensation signal based on the voltage level of the compensation voltage. The compensation signal has a width in a high section that varies. The booster boosts the response speed of the compensator in a predetermined section based on a control signal.

公开(公告)号：US10290246B2

公开(公告)日：2019-05-14

申请号：US15498191

申请日：2017-04-26

Applicant: Samsung Display Co., Ltd.

Inventor： Jongjae Lee ,  Seokhwan Lee ,  Dae-sik Lee ,  Seyoung Heo

IPC: G09G3/3266 ,  G09G3/00 ,  G09G3/36 ,  G09G3/3225

Abstract: A display apparatus includes a plurality of pixels for receiving a plurality of gate signals, and a plurality of data voltages, a level shifter for receiving a gate driving voltage and a plurality of gate control clocks to generate a plurality of reference clocks, and for generating a plurality of control clocks by delaying the reference clocks by a predetermined time, a gate driver for outputting the gate signals in response to the control clocks, a short circuit protector for sensing a current of each control clock at each falling edge of each gate control clock to detect a static current of the each control clock, and for outputting a shut-down signal based on a count of the static current detection, and a voltage generator for providing the gate driving voltage to the level shifter, and shutting down in response to the shut-down signal.

公开(公告)号：US20160323946A1

公开(公告)日：2016-11-03

申请号：US15048448

申请日：2016-02-19

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Dae-sik Lee ,  Seokhwan Lee ,  Won-hyoung Kang

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0827

Abstract: A backlight unit includes a light source part, a DC/DC converter, and a light source driving circuit. The DC/DC converter receives an input voltage and provides a driving voltage to the light source part. The light source driving circuit receives an analog voltage, generates a clamping voltage on the basis of the analog voltage, and generates a main driving signal applied to the DC/DC converter on the basis of the analog voltage and the clamping voltage. The light source driving circuit decreases a duty ratio of the main driving signal when the analog voltage is equal to or lower than a reference voltage.

Abstract translation: 背光单元包括光源部分，DC / DC转换器和光源驱动电路。 DC / DC转换器接收输入电压并向光源部分提供驱动电压。 光源驱动电路基于模拟电压接收模拟电压，产生钳位电压，并根据模拟电压和钳位电压产生施加到DC / DC转换器的主驱动信号。 当模拟电压等于或低于参考电压时，光源驱动电路降低主驱动信号的占空比。

公开(公告)号：US10009967B2

公开(公告)日：2018-06-26

申请号：US15048448

申请日：2016-02-19

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Dae-sik Lee ,  Seokhwan Lee ,  Won-hyoung Kang

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0827

Abstract: A backlight unit includes a light source part, a DC/DC converter, and a light source driving circuit. The DC/DC converter receives an input voltage and provides a driving voltage to the light source part. The light source driving circuit receives an analog voltage, generates a clamping voltage on the basis of the analog voltage, and generates a main driving signal applied to the DC/DC converter on the basis of the analog voltage and the clamping voltage. The light source driving circuit decreases a duty ratio of the main driving signal when the analog voltage is equal to or lower than a reference voltage.