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公开(公告)号：US10319330B2
公开(公告)日：2019-06-11
申请号：US15312629
申请日：2016-09-27
Inventor： Wenfang Li , Xianming Zhang , Xinhong Chen
Abstract: A flicker control circuit of liquid crystal devices (LCDs) includes a main control chip, a low differential voltage regulator (LDO) circuit, a first resistor, a second resistor, and a reset resistor. The main control chip includes an operational voltage input end, a common voltage output end, and a dividing reference voltage input end. The LDO circuit receives a voltage provided by an external power module and generates a dividing reference voltage in accordance with the received voltage. One end of the first resistor connects to the LDO circuit to receive the dividing reference voltage, and the other end of the first resistor connects to the dividing reference voltage input end. The flicker of the LCDs may be reduced such that the display performance of the LCDs may be enhanced.
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2.发明授权公开(公告)号：US08829807B1
公开(公告)日：2014-09-09
申请号：US13878226
申请日：2013-03-05
Inventor： Xiang Yang , Xinhong Chen
CPC classification number: G09G3/3406 , G09G3/3611 , G09G2320/064 , G09G2330/021
Abstract: The present invention provides a backlight dimming circuit, a dimming method of the same and a liquid crystal display thereof. The backlight dimming circuit comprises a power supply voltage terminal VCC, which is used to provide supply voltage; an operational amplifier Q, the noninverting input terminal of which connected with the power supply voltage terminal VCC, and the inverting input terminal of which connected with a load terminal; a precision resistor R, which is connected between the noninverting input terminal and the inverting input terminal of the operational amplifier Q, the voltage differential signal across the precision resistor R being converted and amplified to a DC voltage signal by the operational amplifier Q and outputting; and a comparator C, the noninverting input terminal of which receiving the DC voltage signal output from the operational amplifier Q, and the inverting input terminal of which receiving a sawtooth signal from a boost IC in a boost converter, which is used to compare the DC voltage signal with the sawtooth signal of the boost IC and then outputting a pulse width modulation dimming signal according the comparison results. The structure of the present invention is simple, and the costs are low. The backlight brightness is associated with the screen in real-time, which reduces the backlight power consumption and promotes the energy conservation of the products.
Abstract translation: 本发明提供一种背光调光电路及其调光方法及其液晶显示装置。 背光调光电路包括用于提供电源电压的电源电压端子VCC; 运算放大器Q，其同相输入端与电源电压端VCC连接，反相输入端与负载端连接; 连接在运算放大器Q的同相输入端子和反相输入端子之间的精密电阻器R，精密电阻器R两端的电压差信号被运算放大器Q转换并放大为直流电压信号并输出; 以及比较器C，其同相输入端接收从运算放大器Q输出的直流电压信号，其反相输入端从升压转换器中的升压IC接收锯齿波信号，用于比较DC 电压信号与升压IC的锯齿波信号，然后根据比较结果输出脉宽调制调光信号。 本发明的结构简单，成本低。 背光亮度与屏幕实时相关，降低了背光功耗，促进了产品的节能。
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公开(公告)号：US20150154916A1
公开(公告)日：2015-06-04
申请号：US14240382
申请日：2014-01-17
Inventor： Xinhong Chen , Xiang Yang
CPC classification number: G09G3/342 , G09G3/3611 , G09G2320/0247 , G09G2320/064
Abstract: The present invention provides a liquid crystal display device and a backlight driving method thereof. The liquid crystal display device includes a liquid crystal display panel and a backlight panel, wherein the liquid crystal display panel includes a main control unit, and the backlight panel includes light-emitting units and a backlight driving circuit. The backlight driving method comprises steps of: the main control unit outputting a frequency control signal; the backlight driving circuit outputting at least one diming control signal based on the frequency control signal sent by the main control unit, and periodically controlling turn-on and turn-off of the light-emitting units based on the dimming control signal; wherein frequency of the dimming control signal is N times of a screen refresh frequency of the liquid crystal display panel, and N is an integer greater or equal to 2. The method can effectively eliminate backlight flickers for liquid crystal display devices with an ultra-high degree of resolution. The present invention is especially suitable for LED backlight source liquid crystal display devices with an ultra-high degree of resolution.
Abstract translation: 本发明提供一种液晶显示装置及其背光驱动方法。 液晶显示装置包括液晶显示面板和背光面板，其中液晶显示面板包括主控制单元，背光面板包括发光单元和背光驱动电路。 背光驱动方法包括以下步骤：主控制单元输出频率控制信号; 所述背光驱动电路基于由所述主控制单元发送的频率控制信号输出至少一个调光控制信号，并且基于所述调光控制信号周期性地控制所述发光单元的接通和断开; 其中调光控制信号的频率是液晶显示面板的画面刷新频率的N倍，N是大于或等于2的整数。该方法可以有效地消除具有超高的液晶显示装置的背光闪烁 解决度 本发明特别适用于具有超高分辨率的LED背光源液晶显示装置。
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公开(公告)号：US09024532B2
公开(公告)日：2015-05-05
申请号：US13811404
申请日：2012-12-21
Inventor： Wei Chen , Xinhong Chen , Hua Zhang
IPC: H05B33/08 , H05B37/00 , G02F1/1335
CPC classification number: G02F1/133603 , G02F2001/133612 , H05B33/0815 , H05B33/0857
Abstract: The present invention discloses a direct type LED backlight and a liquid crystal display thereof. The direct type LED backlight comprises a power converting circuit, which transfers an alternating current voltage generated from an external liquid crystal display into direct an current voltage and outputs it; multiple LED strings connected in parallel, wherein each LED string comprises a predetermined amount of LED connected in parallel, which receives a direct current from the power converting circuit; wherein, the predetermined amount is limited to that the direct current of the LED string emitting light normally is smaller than or equal to the direct current output from the power converting circuit. According to the direct type LED backlight of the present invention, it can avoid using a boost circuit in order to decrease circuit complexity and save costs.
Abstract translation: 本发明公开了一种直接型LED背光源及其液晶显示器。 直接型LED背光源包括功率转换电路，其将从外部液晶显示器产生的交流电压转换为直流电流并将其输出; 并联连接的多个LED串，其中每个LED串包括并联连接的预定量的LED，其从电力转换电路接收直流电流; 其特征在于，所述规定量限于通常发光的LED串的直流电流小于或等于从电力转换电路输出的直流电流。 根据本发明的直接型LED背光源，可以避免使用升压电路，以降低电路复杂度并节约成本。
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5.发明申请LED BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE LED BACKLIGHT DRIVING CIRCUIT 有权LED背光驱动电路，LCD装置及驱动LED背光驱动电路的方法公开(公告)号：US20140354176A1
公开(公告)日：2014-12-04
申请号：US14004418
申请日：2013-06-28
Inventor： Xinhong Chen
CPC classification number: G09G3/3406 , G09G3/3426 , G09G2320/066 , H05B33/0845
Abstract: A light emitting diode (LED) backlight driving circuit includes a power supply, constant current driving unit that drives LED light bars, a switching unit coupled to the power supply, and M light units that are connected with each other in parallel. Each of the light units comprises at least two LED light bars that are connected with each other in parallel, and an input end of each of the LED light bars is coupled to the switching unit. The constant current driving unit includes a plurality of dimming channels coupled to an output end of the LED light bars, and each of the dimming channels is connected with M LED light bars. The M LED light bars connected with a same dimming channel are arranged in different light units, one LED light bar is coupled to one dimming channel. The power supply is only coupled to one light unit through the switching unit when the LED backlight driving circuit is in operation, and M is a positive integer.
Abstract translation: 发光二极管（LED）背光驱动电路包括电源，驱动LED灯条的恒流驱动单元，耦合到电源的开关单元和并联连接的M个光单元。 每个光单元包括彼此并联连接的至少两个LED灯条，并且每个LED灯条的输入端连接到开关单元。 恒流驱动单元包括耦合到LED灯条的输出端的多个调光通道，并且每个调光通道与M个LED灯条连接。 与相同调光通道连接的M LED灯条以不同的灯单元布置，一个LED灯条耦合到一个调光通道。 当LED背光驱动电路运行时，电源仅通过开关单元耦合到一个光单元，M是正整数。
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Patent Agency Ranking
公开(公告)号：US09232585B2
公开(公告)日：2016-01-05
申请号：US14130322
申请日：2013-12-03
Inventor： Xinhong Chen , Xiang Yang
CPC classification number: H05B33/0818 , G09G3/3406 , G09G3/3648 , G09G2320/064 , G09G2354/00 , H05B37/02 , H05B37/0281
Abstract: The present disclosure provides a backlight regulation circuit and a liquid crystal display having the same. The backlight regulation circuit includes a PWM signal generating module, a D/A conversion module, and a current driving module. The PWM signal generating module is configured for generating a PWM signal and outputting the PWM signal to the current driving module; the D/A conversion module receives an operation command inputted by user and outputs a preset voltage to the current driving module according to the operation command; the current driving module receives the PWM signal, amplifies the PWM signal according to the preset voltage, and outputs the amplified PWM signal to an electrical switch in control of switch-on and switch-off of a backlight, thereby controlling the switch-on and switch-off of the backlight. The present disclosure integrates multiple LED backlight schemes, expands the application range of the backlight regulation circuit, and shortens the development cycle.
Abstract translation: 本公开提供了一种背光调节电路和具有该背光调节电路的液晶显示器。 背光调节电路包括PWM信号产生模块，D / A转换模块和电流驱动模块。 PWM信号生成模块被配置为产生PWM信号并将PWM信号输出到当前驱动模块; D / A转换模块接收用户输入的操作命令，并根据操作命令向当前驱动模块输出预设电压; 当前驱动模块接收PWM信号，根据预设电压放大PWM信号，并将放大的PWM信号输出到电开关，控制背光源的接通和关断，从而控制开关和 关闭背光。 本公开集成了多个LED背光方案，扩展了背光调节电路的应用范围，缩短了开发周期。
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公开(公告)号：US20150208473A1
公开(公告)日：2015-07-23
申请号：US14130322
申请日：2013-12-03
Inventor： Xinhong Chen , Xiang Yang
CPC classification number: H05B33/0818 , G09G3/3406 , G09G3/3648 , G09G2320/064 , G09G2354/00 , H05B37/02 , H05B37/0281
Abstract: The present disclosure provides a backlight regulation circuit and a liquid crystal display having the same. The backlight regulation circuit includes a PWM signal generating module, a D/A conversion module, and a current driving module. The PWM signal generating module is configured for generating a PWM signal and outputting the PWM signal to the current driving module; the D/A conversion module receives an operation command inputted by user and outputs a preset voltage to the current driving module according to the operation command; the current driving module receives the PWM signal, amplifies the PWM signal according to the preset voltage, and outputs the amplified PWM signal to an electrical switch in control of switch-on and switch-off of a backlight, thereby controlling the switch-on and switch-off of the backlight. The present disclosure integrates multiple LED backlight schemes, expands the application range of the backlight regulation circuit, and shortens the development cycle.
Abstract translation: 本公开提供了一种背光调节电路和具有该背光调节电路的液晶显示器。 背光调整电路包括PWM信号发生模块，D / A转换模块和电流驱动模块。 PWM信号生成模块被配置为产生PWM信号并将PWM信号输出到当前驱动模块; D / A转换模块接收用户输入的操作命令，并根据操作命令向当前驱动模块输出预设电压; 当前驱动模块接收PWM信号，根据预设电压放大PWM信号，并将放大的PWM信号输出到电开关，控制背光源的接通和关断，从而控制开关和 关闭背光。 本公开集成了多个LED背光方案，扩展了背光调节电路的应用范围，缩短了开发周期。
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8.发明授权LED backlight driving circuit, LCD device, and method for driving the LED backlight driving circuit 有权LED背光驱动电路，LCD装置以及驱动LED背光驱动电路的方法公开(公告)号：US09018857B2
公开(公告)日：2015-04-28
申请号：US14004418
申请日：2013-06-28
Inventor： Xinhong Chen
IPC: G05F1/00 , H05B37/02 , H05B39/04 , H05B41/36 , H05B37/00 , H05B39/00 , H05B41/00 , G09G3/34 , H05B33/08
CPC classification number: G09G3/3406 , G09G3/3426 , G09G2320/066 , H05B33/0845
Abstract: A light emitting diode (LED) backlight driving circuit includes a power supply, a constant current driving unit that drives LED light bars, a switching unit coupled to the power supply, and M light units that are connected with each other in parallel. Each of the light units comprises at least two LED light bars that are connected with each other in parallel, and an input end of each of the LED light bars is coupled to the switching unit. The constant current driving unit includes a plurality of dimming channels coupled to an output end of the LED light bars, and each of the dimming channels is connected with M LED light bars. The M LED light bars connected with a same dimming channel are arranged in different light units, one LED light bar is coupled to one dimming channel. The power supply is only coupled to one light unit through the switching unit when the LED backlight driving circuit is in operation, and M is a positive integer.
Abstract translation: 发光二极管（LED）背光驱动电路包括电源，驱动LED光条的恒流驱动单元，耦合到电源的开关单元和并联连接的M个光单元。 每个光单元包括彼此并联连接的至少两个LED灯条，并且每个LED灯条的输入端连接到开关单元。 恒流驱动单元包括耦合到LED灯条的输出端的多个调光通道，并且每个调光通道与M个LED灯条连接。 与相同调光通道连接的M LED灯条以不同的灯单元布置，一个LED灯条耦合到一个调光通道。 当LED背光驱动电路运行时，电源仅通过开关单元耦合到一个光单元，M是正整数。
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公开(公告)号：US10311807B2
公开(公告)日：2019-06-04
申请号：US15301022
申请日：2016-07-14
Inventor： Xinhong Chen
Abstract: The present disclosure provides a gamma correction system and method. In the present disclosure, a gamma correction method used for a display panel of a liquid crystal display includes: measuring actual brightness values of preset highest grayscale and lowest grayscale of a central region of the display panel; calculating target brightness values of respective preset tie-point grayscales of the central area based on the actual brightness values, wherein the respective preset tie-point grayscale are located between the preset highest grayscale and the lowest grayscale; adjusting the respective preset tie-point grayscale of the central region and regions of both sides respectively according to the target brightness values, and computing compensating grayscale values of the adjusted respective preset tie-point grayscale; storing the compensating grayscale values, and correcting the gamma curves of the central region and the regions of both sides by using the stored compensating grayscale values.
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公开(公告)号：US09959797B2
公开(公告)日：2018-05-01
申请号：US14908113
申请日：2015-11-26
Inventor： Xinhong Chen
CPC classification number: G09G3/006 , G02F1/1309 , G02F1/136204 , G09G3/36 , G09G3/3648 , G09G3/3696 , G09G2300/0408 , G09G2310/0289 , G09G2330/027 , G09G2330/12 , H01L27/0248 , H02H1/0007 , H02H3/025 , H02H3/16
Abstract: The circuit of the present invention comprises a detection module and a feedback module, wherein an output end of a power supply management module is coupled to one end of a voltage level shift module, and the other end of the voltage level shift module is coupled to a first end of the detection module, and a second end of the detection module is coupled to a WOA route module or a GOA route module, and a third end of the detection is coupled to one end of the feedback module, and the other end of the feedback module is coupled to an enable end of the power supply management module, and the detection module detects whether the WOA route module or the GOA route module is short, and feeds back a short signal; the feedback module receives the short signal, and sends a disable signal to the enable end.
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