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公开(公告)号：US10395614B2
公开(公告)日：2019-08-27
申请号：US15570217
申请日：2017-07-26
Inventor： Dan Cao
IPC: G09G3/36
Abstract: A common voltage generating circuit is applied to a liquid crystal display circuit and includes M common voltage generating sub-circuits. The liquid crystal display circuit includes a data-driving chip, a row-driving chip, a thin film transistor (TFT) array, and a liquid crystal unit array corresponding to the TFT array. The row-driving chip is used to for opening the TFT array row-by-row through scanning lines. The data-driving chip is used for charging one row of the liquid crystal unit corresponding one row of TFT through data lines. N input terminals of a first common voltage generating sub-circuit respectively connect with adjacent N data lines output from the data-driving chip, an output terminal of the first common voltage generating sub-circuit connects with a common terminal of the liquid crystal unit corresponding to the N data lines, N is an even number.
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公开(公告)号：US10116206B2
公开(公告)日：2018-10-30
申请号：US14904742
申请日：2015-10-29
Inventor： Xianming Zhang , Dan Cao
Abstract: The embodiment of the present invention discloses a loop compensation circuit and a switching power supply circuit. The loop compensation circuit can comprise: a voltage detection circuit, a control chip and a RC circuit, and the voltage detection circuit is coupled to a voltage generation circuit, and employed to detect a variation of an output voltage of the voltage generation circuit; the control chip is respectively coupled to the voltage detection circuit and the RC circuit, and employed to detect a response speed of the loop compensation circuit and to adjust a parameter of the RC circuit according to the response speed of the loop compensation circuit and the variation of the output voltage of the voltage generation circuit for adjusting the response speed of the loop compensation circuit.
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公开(公告)号：US10063136B2
公开(公告)日：2018-08-28
申请号：US15300428
申请日：2016-08-11
Inventor： Dan Cao
CPC classification number: H02M1/36 , H02M1/00 , H02M1/08 , H02M1/32 , H02M2001/0006 , H02M2001/0032 , H02M2001/0048 , H03K17/166 , Y02B70/1491
Abstract: The present disclosure relates to a control circuit of the switching power supply including a soft-booting voltage generation circuit, a first comparator, a voltage selection circuit, a switching circuit, a second comparator, an error amplification circuit, and a pulse signal control circuit. During the soft-booting phase and during the operational phase, different superposition voltages are superposed with the control voltage by the voltage selection circuit to obtain the clamping voltage. Thus, different clamping voltages are configured during the soft-booting phase and the operational phase, which contributes to the system stability. In addition, when the output voltage of the switching circuit is greater than the reference voltage, the second comparator outputs the first high level signals to the clock signal generator. The clock signal generator then stops operations, that is, and the control circuit of the switching power supply is in the sleep mode, which enhances the efficiency of the power.
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公开(公告)号：US10062344B2
公开(公告)日：2018-08-28
申请号：US15118813
申请日：2016-06-18
Inventor： Xianming Zhang , Dan Cao
IPC: G09G3/36
CPC classification number: G09G3/3648 , G09G3/3406 , G09G3/36 , G09G2310/0291 , G09G2320/0626
Abstract: The invention provides a voltage stabilizing device. In the voltage stabilizing device, a signal detecting and amplifying circuit detects an operating voltage of the functional circuit, amplifies the detected operating voltage and outputs the amplified voltage signal to a logic processing circuit; the logic processing circuit adjusts a first control signal according to the amplified voltage signal and outputs the adjusted first control signal to a feedback voltage signal generating circuit; the feedback voltage signal generating circuit adjusts a feedback voltage signal according to the adjusted first control signal and outputs the adjusted feedback voltage signal to the logic processing circuit. Moreover, the logic processing circuit further adjusts a second control signal according to the adjusted feedback voltage signal and outputs the adjusted second control signal to the functional circuit, and thereby controls an output voltage of the functional circuit to be kept stable.
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公开(公告)号：US09959800B1
公开(公告)日：2018-05-01
申请号：US15853976
申请日：2017-12-26
Inventor： Xianming Zhang , Dan Cao
Abstract: A voltage compensation circuit and A method thereof are provided. The voltage compensation circuit includes a power management chip, a feedback circuit, and a control circuit. A gate driving voltage (VGH) connects an input end of the control circuit, the input end of the control circuit connects to a first end of the fifth resistor (R5), and a second end of the fifth resistor (R5) connects to a forward input end of the voltage comparator, and first ends of the sixth resistor (R6) and the first capacitor (C1). A second end of the sixth resistor (R6) and a second end of the first capacitor (C1) are grounded, a backward input end of the voltage comparator connects to the reference voltage (VREF), an output end of the voltage comparator connects to a gate of the first FET (Q1). With such configuration, the display performance may be enhanced.
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Patent Agency Ranking
公开(公告)号：US09842554B2
公开(公告)日：2017-12-12
申请号：US14907536
申请日：2015-12-30
Inventor： Dan Cao , Xianming Zhang
CPC classification number: G09G3/3648 , G09G3/3677 , G09G3/3696 , G09G2310/08 , G09G2330/023 , H02M1/08 , H02M3/335 , H02M2001/0009
Abstract: The present disclosure provides driving circuit used to a liquid crystal display, which includes a boost module, a power management module, a power detection module and a micro controller unit, the power management module is connected to the boost module and the micro controller unit, the boost module, the power detection module and the micro controller unit are connected in sequence, the power detection module detects an output power of the boost module, and the micro controller unit switches a working mode of the boost module according to the output power. The driving circuit of the present disclosure may select different working modes according to a magnitude of the output power, so as to distribute the power and increase the efficiency, thus it may effectively solve the problem of lower efficiency and higher temperature of the component under the high power condition.
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7.发明申请公开(公告)号：US20160307484A1
公开(公告)日：2016-10-20
申请号：US14655338
申请日：2015-04-16
Inventor： Xianming ZHANG , Dan Cao
CPC classification number: G09G3/3696 , G09G3/3622 , G09G3/3692
Abstract: A liquid crystal display panel is disclosed and has a driving circuit, a plurality of data lines, a plurality of scanning lines, and a plurality of pixel units. The driving circuit further includes a programmable DC current source being used to output a corresponding shaping electric current according to a reference voltage, and a shaping resistor being used to generate a corresponding shaping voltage according to the outputted shaping electric current. A liquid crystal display apparatus is also disclosed. The apparatus is able to output shaping voltages with different voltage levels at the same time, thus having a better 3D display effect.
Abstract translation: 公开了一种液晶显示面板，并具有驱动电路，多条数据线，多条扫描线和多个像素单元。 驱动电路还包括可编程直流电流源，用于根据参考电压输出相应的整形电流，以及整形电阻器，用于根据输出的整形电流产生相应的整形电压。 还公开了一种液晶显示装置。 该装置能够同时输出具有不同电压电平的整形电压，从而具有更好的3D显示效果。
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公开(公告)号：US09408267B2
公开(公告)日：2016-08-02
申请号：US14367797
申请日：2014-05-21
Inventor： Dan Cao
CPC classification number: H05B33/083 , G02B27/22 , G02F2001/133612 , G09G3/34 , G09G3/36 , G09G5/10 , H04N13/341 , H04N13/359 , H05B33/0815 , H05B33/0827 , H05B37/02 , Y02B20/347
Abstract: A LED backlight for a liquid crystal display (LCD), having a boost circuit for boosting in different display modes, an input voltage for operating each LED in a current display mode. The display modes include 2D and 3D display modes. A plurality of LED strings which are connected in parallel, wherein each LED string having a predetermined number of LEDs connected in series and receives the working voltage required for operating from the boost circuit. A current regulation circuit for regulating in the different display modes, with current flowing through each LED string, such that a ratio of the current flowing through each LED string in the 3D display mode and in the 2D display mode is changed. A controller provides a driving signal to drive the boost circuit, and provides different voltages to the current regulation circuit in the different display modes.
Abstract translation: 一种用于液晶显示器（LCD）的LED背光源，具有用于在不同显示模式下升压的升压电路，用于以当前显示模式操作每个LED的输入电压。 显示模式包括2D和3D显示模式。 并联连接的多个LED串，其中具有串联连接的预定数量的LED的每个LED串并且接收从升压电路操作所需的工作电压。 一种用于调节不同显示模式的电流调节电路，其中电流流过每个LED串，使得在3D显示模式和2D显示模式中流过每个LED串的电流的比率发生变化。 控制器提供驱动信号以驱动升压电路，并且在不同显示模式下向电流调节电路提供不同的电压。
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公开(公告)号：US09332607B2
公开(公告)日：2016-05-03
申请号：US14371725
申请日：2014-06-27
Inventor： Dan Cao
IPC: G09G3/36 , H05B37/00 , H05B33/08 , G02F1/1335
CPC classification number: H05B33/0842 , G02F1/133603 , G02F2001/133612 , G09G3/3406 , G09G2320/064 , G09G2360/14 , H05B33/0815 , H05B33/0818 , H05B33/0851
Abstract: A LED backlight driving circuit includes a voltage boosting circuit for converting an input voltage into an output voltage for a LED string; a current control module connected to a negative terminal of the LED string and for regulating a working current of the LED string; a driver chip for supplying the voltage boost circuit and current control module respectively with first and second square wave signals; a current detection module for detecting the working current of the LED string to generate detection signal; a control signal module for receiving the detection signal to generate a control signal; and a frequency regulation module for receiving the control signal to thereby generate a resistance. The frequency regulation module connects the driver chip, and the driver chip regulates a driving frequency of the driving circuit according to the resistance. A LCD device using the driving circuit also is provided.
Abstract translation: LED背光驱动电路包括用于将输入电压转换为LED串的输出电压的升压电路; 电流控制模块，连接到LED串的负极端子，用于调节LED串的工作电流; 用于分别向升压电路和电流控制模块提供第一和第二方波信号的驱动器芯片; 电流检测模块，用于检测LED串的工作电流以产生检测信号; 控制信号模块，用于接收检测信号以产生控制信号; 以及用于接收控制信号从而产生电阻的频率调节模块。 频率调节模块连接驱动器芯片，驱动器芯片根据电阻调节驱动电路的驱动频率。 还提供了使用驱动电路的LCD装置。
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公开(公告)号：US09268349B2
公开(公告)日：2016-02-23
申请号：US14240377
申请日：2014-01-21
Abstract: The present invention relates to a circuit and method for optimizing an input voltage range of an IC chip. In the circuit, a pull-up unit, receives an input voltage and then outputs a corresponding voltage level; a trigger unit compares the voltage level output by the pull-up unit with a given threshold voltage, and outputs an enabling signal of corresponding level to an enabling end of the IC chip based on the comparison result, so as to control the IC chip to start/stop; and a voltage stabilizing unit receives the voltage levels output by the pull-up unit and the trigger unit, and then outputs a voltage of corresponding level to the pull-up unit based on the voltage levels output by the pull-up unit and the trigger unit, so that the voltage level output by the pull-up unit is higher than or equal to the threshold voltage and thereby the IC chip starts operation, or so that the voltage level output by the pull-up unit is maintained to be higher than or equal to the threshold voltage and thereby the operation of the IC chip is not affected by variations of the input voltage. The present invention can ensure that when the input voltage is changed within a certain range the IC still can work in a normal manner.
Abstract translation: 本发明涉及一种用于优化IC芯片的输入电压范围的电路和方法。 在该电路中，上拉单元接收输入电压，然后输出相应的电压电平; 触发单元将上拉单元输出的电压电平与给定的阈值电压进行比较，并根据比较结果将相应电平的使能信号输出到IC芯片的使能端，以便将IC芯片 开始/停止 并且电压稳定单元接收上拉单元和触发单元输出的电压电平，然后基于上拉单元和触发器输出的电压电平向上拉单元输出相应电平的电压 单元，使得上拉单元输出的电压电平高于或等于阈值电压，从而IC芯片开始运行，或者使得上拉单元输出的电压电平维持为高于 或等于阈值电压，从而IC芯片的操作不受输入电压变化的影响。 本发明可以确保当输入电压在一定范围内变化时，IC仍能以正常的方式工作。
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