Patent application number | Description | Published |
20110032179 | BACKLIGHT UNIT, DISPLAY APPARATUS HAVING THE SAME AND METHOD OF INSPECTING THE SAME - A backlight unit includes light source groups, a converter, a compensator, a detector and a protector. Each of the light source groups includes a light source, and the converter boosts an input voltage to a driving voltage that is supplied to the light source groups. The compensator is connected to the light source groups and compensates a deviation between currents fed back to the compensator from each of the light source groups. The detector is connected between the compensator and the light source groups and detects a maximum voltage from among feedback voltages fed back to the compensator from each of the light source groups. The protector is connected to the detector and receives the maximum voltage, and compares the maximum voltage to a reference voltage to generate a compared result. The protector outputs a protection signal to the converter based on the compared result. | 02-10-2011 |
20110101874 | METHOD OF DRIVING LIGHT SOURCE AND DISPLAY APPARATUS FOR PERFORMING THE METHOD - A method of driving a light source apparatus includes inverting a direct current voltage to generate a first alternating current voltage, transforming the first alternating current voltage into a second alternating current voltage having a voltage level that is greater than a voltage level of the first alternating current voltage, compensating a driving alternating current voltage based on the second alternating current voltage to generate a compensated driving alternating current voltage such that a substantially equal current flows through each light emitting string of a plurality of light emitting string included in the light source apparatus, and rectifying the compensated driving alternating current voltage to apply a driving voltage to the light emitting strings. | 05-05-2011 |
20110175547 | BACKLIGHT UNIT, DRIVING METHOD THEREOF, AND ERROR DETECTION METHOD THEREOF - A backlight unit includes a driving circuit, a plurality of light source strings, and an error detector. The driving circuit outputs a driving voltage. Each of the light source strings includes a plurality of light sources and receives the driving voltage through input terminals of the light source strings to generate a light. The error detector is connected to output terminals of the light source strings and senses voltages between the input terminals and the output terminals of the light source strings to detect an error in the light sources using a first voltage and a second voltage. The first voltage is a voltage difference between a maximum and a minimum of the sensed voltages and the second voltage is obtained by dividing one sensed voltage of the sensed voltages by a number of the light sources of a light source string from which the one sensed voltage is sensed. | 07-21-2011 |
20110279485 | DISPLAY APPARATUS - A display apparatus includes a backlight unit which emits a light, and a display panel which receives the light to display an image. The backlight unit includes a driving circuit which outputs a driving voltage and a reference voltage; and p light source blocks connected to the driving circuit, p being a natural number greater than or equal to 2, where each light source block of the p light source blocks receives the driving voltage through a first terminal thereof and the reference voltage through a second terminal thereof to generate the light, and the p light source blocks are divided into a plurality of groups, each group including at least two light source blocks. The driving circuit includes a first switching section which applies the driving voltage to first terminals of the p light source blocks, and a second switching section which applies the reference voltage to the second terminal of at least one of the p light source blocks. | 11-17-2011 |
20120146543 | CONNECTOR FOR LIGHT SOURCE MODULE AND BACKLIGHT ASSEMBLY HAVING THE SAME - A connector for a light source module includes a body portion and a terminal portion. The body portion includes a first opening portion and a second opening portion. The first opening portion receives a portion of the light source module. The second opening portion receives a portion of a light source driver which drives the light source module. The terminal portion includes a first terminal and a second terminal. The first terminal is in the first opening portion of the body portion. The second terminal is connected to the first terminal. The second terminal is in the second opening portion of the body portion. | 06-14-2012 |
20120256894 | BACK LIGHT UNIT AND DISPLAY DEVICE INCLUDING THE SAME - A backlight unit includes a DC-DC converter; a voltage control unit which controls output voltage of the DC-DC converter; a plurality of unit light emitting diode arrays; and current deviation compensating unit in connection with input terminals of the plurality of unit light emitting diode arrays. The current deviation compensating unit receives the controlled voltage of the voltage control unit and transfers a feedback signal to the voltage control unit based on the received voltage, and actively compensates a current deviation generated by electrical characteristics of the plurality of unit light emitting diode arrays and transfers the compensated current deviation to the input terminals of the plurality of unit light emitting diode arrays. | 10-11-2012 |
20130113841 | BACKLIGHT UNIT AND DISPLAY DEVICE INCLUDING THE SAME - A backlight unit includes: a light source unit including at least one light emitting diode (“LED”) string; a driving current controller which is connected to a cathode terminal of the at least one LED string and controls a driving current which flows through the at least one LED string; a feedback unit which generates a feedback signal based on a dimming input signal and a voltage of the cathode terminal of the at least one LED string; and a direct current to direct current (“DC-DC”) converter which generates a driving voltage in response to the feedback signal and provides the driving voltage to the light source unit. | 05-09-2013 |
20130313985 | METHOD OF DRIVING A LIGHT SOURCE, LIGHT SOURCE APPARATUS FOR PERFORMING THE METHOD AND DISPLAY APPARATUS HAVING THE LIGHT SOURCE APPARATUS - A method of driving a light source includes outputting a variable driving voltage to a light source part, sensing a first voltage based on the driving voltage and developed at a first end of the light source part, sensing a second voltage developed at a second end of the light source part due to current passing through the light source part and adjusting the driving voltage while using the first and second voltages so that power consumption by the light source part is substantially constant irrespective of temperature of the light source part and/or irrespective of a duty cycle ration being used to drive the light source part. Thus, a luminance of the light source part may be maintained at substantially uniform levels. | 11-28-2013 |
20130321484 | METHOD OF DRIVING LIGHT-SOURCE AND DISPLAY APPARATUS FOR PERFORMING THE METHOD - A method of driving a light-source module includes adjusting a frequency of a boosting switching signal based on a dimming signal which controls luminance of a light-emitting diode (“LED”) string of the light-source module, where the LED string comprises a plurality of LEDs connected to each other in series, and controlling a main transistor in response to the boosting switching signal to transfer a driving voltage to the LED string. | 12-05-2013 |
20140111497 | BACKLIGHT UNIT AND DISPLAY DEVICE INCLUDING THE SAME - A backlight unit includes a power supply converter including a primary winding connected to an input power supply voltage, and a secondary winding which is connected to an output node and outputs a light emitting diode drive voltage to the output node in response to a mode signal and a switching control signal; and a light emitting diode string connected to the output node of the power supply converter, where the power supply converter serially connects a boosting winding to the secondary winding and the output node and when the mode signal represents a three dimensional image display mode, and outputs a boosted light emitting diode drive voltage to the output node through the boosting winding. | 04-24-2014 |
20140144688 | CIRCUIT BOARD AND METHOD OF MOUNTING ELECTRONIC COMPONENT ON CIRCUIT BOARD - Provided are a circuit board, and a method of mounting an electronic component on the circuit board. The circuit board according to an exemplary embodiment of the present invention includes: a pad pattern including a basic pattern and one or more additional patterns connected to the basic pattern, in which the basic pattern includes a region in which a connection terminal of an electronic component is attached by solder, the one or more additional patterns include regions in which the connection terminal of the electronic component is not attached, and the basic pattern includes an exposed side or an exposed point capable of limiting a mounting position so as to prevent the electronic component from exceeding an alignment margin. | 05-29-2014 |
20140145626 | BACKLIGHT UNIT AND DISPLAY DEVICE HAVING THE SAME - In a display device, a backlight unit including a power converter configured to generate a light source driving voltage in response to a voltage control signal, a plurality of light emitting diode strings each configured to receive the light source driving voltage through an end thereof, and a controller connected to the other end of each of the plurality of light emitting diode stringsand configured to generate a plurality of current control signals used to control a current flowing through each of the plurality of light emitting diode strings and the voltage control signal. The controller is configured to generate the voltage control signal in response to a current control signal from among the plurality of current control signals, which is applied to a light emitting diode string configured to receive a lowest forward driving voltage among the plurality of light emitting diode strings. | 05-29-2014 |
20140192102 | BACKLIGHT UNIT AND DISPLAY DEVICE HAVING THE SAME - A backlight unit includes a power converter configured to generate a light source driving voltage in response to a voltage control signal, a plurality of light emitting diode strings, where each of the light emitting diode strings receives the light source driving voltage through a first terminal thereof, a plurality of transistors corresponding to the light emitting diode strings, where each of the transistors includes: a first electrode connected to a second terminal of a corresponding light emitting diode string thereof; a second electrode; and a control electrode, and a controller connected to the control electrode and the second electrode, where the controller outputs a plurality of current control signals to control electrodes of the transistors and generate the voltage control signal, where the controller generates an over-current detection signal when any one of the current control signals has a pulse width greater than a predetermined reference width. | 07-10-2014 |
Patent application number | Description | Published |
20080198299 | LIGHT SOURCE UNIT, LIQUID CRYSTAL DISPLAY HAVING THE SAME, AND METHOD THEREOF - A light source unit which can minimize current differences between a plurality of light emitting diodes (“LEDs”) includes a printed circuit board (“PCB”) which includes an active region that emits light and an inactive region that accounts for a remainder of the PCB, an LED array which includes a plurality of LEDs that are arranged at regular intervals, and a current balancing circuit which is disposed in the inactive region, generates a plurality of current balancing voltages by uniformly adjusting current differences between the LEDs, and outputs the current balancing voltages. A liquid crystal display (“LCD”) including the light source unit, and a method of minimizing current differences between a plurality of LEDs are further provided. | 08-21-2008 |
20080258645 | BACKLIGHT INVERTER AND LIQUID CRYSTAL DISPLAY USING THE SAME - A backlight inverter includes a transformer boosting an input voltage at a ratio of a primary winding to a secondary winding of the transformer and outputting a first voltage and a second voltage; a protection level signal generator causing a phase delay between the first voltage and the second voltage, and generating a protection level signal, the protection level signal being a sum of the phase reversed first voltage and the second voltage; and an arc state detector comparing the protection level signal with a reference voltage and generating a detection signal; and a diving controller maintaining or stopping a supplying of an input voltage to the transformer in response to the detection signal, wherein in addition to the phase delay, another phase delay is caused by an open circuit in the transformer, so that a maximum value of the protection level signal is larger than the reference voltage and the input voltage is stopped. | 10-23-2008 |
20090261755 | INVERTER CIRCUIT, BACKLIGHT DEVICE AND LIQUID CRYSTAL DISPLAY HAVING THE SAME - An inverter circuit for a backlight device includes an inverter transformer which supplies a high AC voltage to a plurality of discharge tubes, a filter circuit connected to an output terminal of the inverter transformer, and an abnormal discharge detection circuit. The filter circuit passes a current signal having a high frequency component of the high AC voltage to the abnormal discharge detection circuit, and the abnormal discharge detection circuit detects an abnormal discharge current based on the current signal. | 10-22-2009 |
20090262276 | LIQUID CRYSTAL DISPLAY - A liquid crystal display (“LCD”) includes; a lower receiving container which includes; a bottom plate, sidewalls extending from the bottom plate, a first through-hole formed in the bottom plate, and a guide pole disposed on the bottom plate and which substantially surrounds the first through-hole, a plurality of light sources disposed within the lower receiving container; an optical sensor printed circuit board (“PCB”) attached to a bottom surface of the bottom plate, wherein the optical sensor printed circuit board covers the first through-hole, and an optical sensor mounted on the optical sensor PCB and inserted into the first through-hole. | 10-22-2009 |