Patent application number | Description | Published |
20130335923 | PCB for LCD Device and LCD Device - The invention relates to the field of LCDs, and more particularly to a PCB for an LCD device and an LCD device. The PCB includes a front face and a back face; the front face of the PCB is a face for densely arranging components, and the back face is a face without densely arranged components; the back face of the PCB is provided with a jumper wire for dissipating heat, and the jumper wire is connected with a terminal of the component. The heat of the component is transmitted to the jumper wire by the terminal, and the jumper wire is used for auxiliarily strengthening heat dissipation. Because the back face of the PCB is the face without densely arranged components, the temperature of the back face is lower than that of the front face of the PCB, and the temperature difference between the jumper wire and the environmental of the back face of the PCB is large. Thus, the heat is rapidly transmitted, and the heat dissipating effect is significantly improved. | 12-19-2013 |
20130342108 | Backlight Driving Circuit, LCD module, and Manufacturing Method Thereof - The invention provides a backlight driving circuit, an LCD device, and a manufacturing method thereof. The backlight driving circuit includes at least two LED lightbars arranged in parallel connection, the output end of each of the LED lightbars is coupled with a variable current circuit, and the variable current circuit is provided with adjustable variable resistors used for balancing the voltage difference between the LED lightbars. In the invention, because the adjustable variable resistors are arranged in the variable current circuit which is connected in series with the LED lightbars, the resistance of the adjustable variable resistors can be adjusted according to the resistance of different LED lightbars before being used; thus, the total voltage of each LED lightbar and the variable resistor connected with ed LED lightbars in series can keep consistent. Therefore, the voltages of all the pins of the control IC coupled into the driver converter can be consistent, and no additional current can be generated in the control IC because no voltage differences exist between pins basically; thus, the power consumption of the control IC is reduced, and the heat productivity of the control IC is reduced, thereby reducing the temperature of the control IC. | 12-26-2013 |
20130342118 | LED Backlight Driving Circuit, LCD Device, and Manufacturing Method - The invention provides an LED backlight driving circuit, an LCD device, and a manufacturing method. The LED backlight driving circuit includes at least two lightbars arranged in parallel connection; at least one LED lightbar is in series connection with a divider resistor(s) used for balancing the voltage difference between the LED lightbars. In the invention, because the LED lightbar(s) is in series connection with the divider resistors used for balancing the voltage difference between the LED lightbars, the divider resistors with different resistance can be connected in series according to different resistance of all the LED lightbars during design, to enable the total voltage difference of each LED lightbar and the divider resistor to be equal; thus, the voltages of all the pins of the IC coupled into the drive converter can be consistent, and no additional current can be generated in the IC because no voltage differences exist between pins basically; thus, the power consumption of the IC is reduced, and the heat productivity of the IC is reduced, thereby reducing the temperature of the IC. | 12-26-2013 |
20130343039 | DRIVING CIRCUIT FOR LED BACKLIGHT, LCD DEVICE, AND METHOD FOR MANUFACTURING DRIVING CIRCUIT FOR LED BACKLIGHT - The driving circuit for a light emitting diode (LED) backlight includes at least two lightbars arranged in parallel connection. An output end of each of the LED lightbars is coupled with a converter module, and the converter module is configured with a digital potentiometer balancing a voltage difference between the LED lightbars and adjusting a resistance by an electric signal. In the present disclosure, the digital potentiometer adjusting the resistance by the electric signal is arranged in the converter module connected with the LED lightbar in series, and the resistance of the digital potentiometer is dynamically adjusted according to the resistance of different LED lightbars during use. Thus, the total voltage of each LED lightbar and the digital potentiometer connected with the LED lightbar in series is constant. | 12-26-2013 |
20140145646 | LED VOLTAGE ADJUSTMENT DEVICE AND DRIVE SYSTEM THEREOF - The present invention provides LED voltage adjustment device and drive system thereof. The device includes PI regulator, with negative terminal connected to negative terminal of LED light bar to receive negative terminal voltage of light bar and positive terminal of PI regulator being for receiving reference voltage; integrator, for performing integral on output signal of PI regulator; a subtractor, with positive input terminal receiving output signal from PI regulator and negative terminal receiving overcurrent protection detection voltage from boost converter for driving light bar, and subtracting overcurrent protection detection voltage from output signal of PI regulator; comparator, with positive terminal receiving output signal from integrator and negative terminal receiving output signal from subtractor; and integrated circuit (IC) module, for receiving output signal from comparator and based on received output signal to control a control signal to conduct or cut off switch transistor of boost converter. | 05-29-2014 |
20140168052 | LED BACKLIGHT DRIVING CIRCUIT AND LCD DEVICE - A light emitting diode (LED) backlight driving circuit includes an LED lightbar, and a driver integrated circuit (IC) coupled to the LED lightbar. The driver IC is configured with a protection pin that controls the driver IC to enter a protection mode when a voltage of the protection pin exceeds a preset voltage range, an undervoltage module is coupled between a power input end of the LED lightbar and the protection pin, and an overvoltage protection module is coupled between a power output end of the LED lightbar and the protection pin. An output overvoltage protection module is coupled between the power output end of the LED lightbar and the protection pin. The input undervoltage protection module outputs a first control voltage that exceeds the preset voltage range to the protection pin when the power input end of the LED lightbar is in an undervoltage state. The output overvoltage protection module outputs a second control voltage that exceeds the preset voltage range to the protection pin when the power input end of the LED lightbar is in an overvoltage state. | 06-19-2014 |
20140176020 | PROTECTION CIRCUIT FOR BACKLIGHT DRIVER CIRCUIT, BACKLIGHT MODULE, AND LCD DEVICE - A protection circuit of a backlight driver circuit includes a backlight driver circuit. The backlight driver circuit includes a backlight driver integrated circuit (IC), and the backlight driver IC includes a protection pin that controls the backlight driver IC to enter a protection mode. The backlight driver circuit further includes a protection circuit, and the protection circuit includes a monitoring unit that monitors a temperature of the backlight driver circuit. When the temperature of the backlight driver circuit exceeds a preset temperature, the monitoring unit sends the protection signal to the protection pin to control the backlight driver IC to enter the protection mode. | 06-26-2014 |
20140184482 | LCD DEVICE DRIVER CIRCUIT, DRIVING METHOD, AND LCD DEVICE - A driver circuit of a liquid crystal display (LCD) device includes a drive line driving a lightbar of the LCD device. A discharge module and a switch module are in series connection between the drive line and a ground end of the LCD device driver circuit in sequence; a starting signal sent by the LCD device is coupled to the switch module. When the starting signal is an OFF signal, the switch module is turned on, and when the starting signal is an ON signal, the switch module is turned off. | 07-03-2014 |
20140253846 | LIQUID CRYSTAL DISPLAY, LED BACKLIGHT SOURCE, AND THE DRIVING METHOD THEREOF - A liquid crystal display, a LED backlight source and the driving method thereof are disclosed. The LED backlight source includes a DC voltage input for inputting DC voltage, a boost circuit for increasing the voltage of the DC input and outputting the boosted DC voltage, a LED strip and a constant current driving circuit. The LED strip includes a plurality of serially connected LEDs and a first resistor (R | 09-11-2014 |
20140267447 | BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND DRIVING METHOD - The present disclosure provides a backlight driving circuit, a liquid crystal display (LCD) device, and a driving method. The backlight driving circuit includes a monitoring device and a conversion device, the conversion device includes a microcontroller (MCU) and a switch module. A control end of the switch module is coupled to the monitoring device, and the monitoring device outputs a monitoring signal to turn on or turn off the switch module. An input end of a power source of the MCU is coupled to a power end of the backlight driving circuit through the switch module. | 09-18-2014 |
20140292200 | BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING BACKLIGHT DRIVING CIRCUIT - A backlight driving circuit includes a power module and a constant current driver chip. The power module includes a first controllable switch. An adjustable load is connected between the first controllable switch and a round terminal of the backlight driving circuit, and the adjustable load includes a switching module controlling a resistance value of the adjustable load, a switching mode signal of the backlight driving circuit is sent to a control end of the switching module. A first end of the adjustable load that is connected to the first controllable switch is coupled to an over current protection (O(P) port of the constant current driver chip, | 10-02-2014 |
20140292630 | LED BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE LED BACKLIGHT DRIVING CIRCUIT - A light emitting diode (LED) backlight driving circuit of the present disclosure includes a monitor module, a first light cluster, a first boost voltage module that drives the first light cluster a second light cluster, and a second boost voltage module that drives the second light cluster. The first boost voltage module includes a first detection unit that detects an output current of the first boost voltage module, and the second boost voltage module includes a second detection unit that detects an output current of the second boost voltage module. The monitor module includes a current comparing unit coupled to the first detection unit and the second detection unit, and an actuator coupled to the current comparing unit. The actuator controls running states of the first boost voltage module and the second boost voltage module. | 10-02-2014 |
20140333204 | LED BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE LED BACKLIGHT DRIVING CIRCUIT - A light emitting diode (LED) backlight driving circuit includes an LED light bar, a power supply that drives the LED light bar to light, a short-circuit protection unit, and a divider resistor. An output end of the LED light bar is coupled to the short-circuit protection unit and the divider resistor. The short-circuit protection unit includes a comparing unit and a driving unit coupled to the comparing unit. Voltage of two ends of the divider resistor is regarded as a feedback voltage, and the feedback voltage and a first reference voltage are input to the comparing unit. When a difference value of the first reference voltage subtracted from the feedback voltage is greater than a preset deviation value; the driving unit controls the power supply to turn off. When brightness of one normal LED light bars reaches a maximum, the first reference voltage is greater than or equal to voltage of two ends of the divider resistor corresponding to the one normal LED light bar. | 11-13-2014 |
20140333518 | LED BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE LED BACKLIGHT DRIVING CIRCUIT - A light emitting diode (LED) backlight driving circuit includes a power module, a constant current driving module, and an LED light bar coupled to the power module. The power module is coupled to a power-voltage collecting module outputting a second comparison voltage, and the LED light bar is coupled to a light-bar-voltage collecting module outputting a first comparison voltage. The constant current driving module includes a switching unit and a control unit coupled to the switching unit and adjusting an output voltage of the power module, the first comparison voltage and the second comparison voltage are sent to the switching unit, and a preset reference voltage is sent to the switching unit. When the first comparison voltage deviates from the reference voltage, and an absolute value of the reference voltage VF subtracted from the first comparison voltage exceeds a preset deviation range of a voltage, the switching unit outputs the first comparison voltage to the control unit. When the absolute value of the reference voltage VF subtracted from the first comparison voltage is within the preset deviation range of the voltage, the switching unit ouputs the second comparison voltage to the control unit. | 11-13-2014 |
20140375213 | LED BACKLIGHT DRIVING CIRCUIT AND METHOD FOR DRIVING THE LED BACKLIGHT DRIVING CIRCUIT - A light emitting diode (LED) backlight driving circuit includes a plurality of LED light bars, a power supply driving the LED light bars to light, and comparing units corresponding to the LED light bars one by one. A first input end of the comparing unit is coupled to a cathode end of the LED light bar, and a second input end of the comparing unit receives a first reference voltage. Each of the LED light bars is connected in series with a switching unit, an output end of the comparing unit is coupled to a statistic unit, an output end of the statistic unit is coupled to driving units corresponding to the switching units one by one and controlling the switching units to turn on/off. The statistic unit divides the LED light bars into two groups according to a logic state output by the comparing unit, and controls the driving unit to turn off one of two groups of LED light bars having a fewer number than the other group of the LED light bars. | 12-25-2014 |