Patent application number | Description | Published |
20080291133 | Plasma display, controller therefor, and driving method thereof - A plasma display according to an exemplary embodiment of the present invention applies different driving methods according to a maximum grayscale level of image data input for one field. When the maximum grayscale level of the field is higher than a reference level, an address period for selecting a light emitting cell and a non-light emitting cell from a plurality of discharge cells and a sustain period for sustain-discharging light emitting cells among the plurality of discharge cells are simultaneously driven in a plurality of sequential subfields after a first subfield. When the maximum grayscale level of the field is less than the reference level, the address period and the sustain period are time-separately driven in the plurality of subfields. | 11-27-2008 |
20090033225 | Circuit board connection structure and plasma display apparatus including the same - A plasma display apparatus includes a panel assembly, the panel assembly including a plurality of discharge electrodes and a plurality of discharge cells between two substrates, a circuit board having a plurality of circuit terminals and a photoresist layer, the circuit terminals being arranged into a plurality of terminal groups, each terminal group including a plurality of circuit terminals, and the photoresist layer being between the circuit terminals and including at least one dummy groove, a connection member on the circuit terminals and on the photoresist layer, and at least one signal transmitting unit connecting the circuit board to the panel assembly, the signal transmitting unit being attached to the circuit terminals via the connection member. | 02-05-2009 |
20090184621 | Plasma Display Apparatus and Method of Manufacturing Same - A plasma display apparatus and a method of manufacturing a plasma display apparatus are provided. According to the invention, the accuracy of alignment of the plasma display apparatus is improved. A plasma display apparatus according to one embodiment of the present invention comprises a plasma display panel for producing images and a chassis to which the plasma display panel is attached. The plasma display panel comprises at least one aligning mark and is attached to a first surface of the chassis. The chassis comprises at least one aligning hole corresponding in position to the position of the aligning mark on the plasma display panel. The chassis comprises aluminum and an anti-reflective material. The anti-reflective material is present in the chassis in an amount ranging from about 12 to about 26 parts by weight per 100 parts by weight aluminum. | 07-23-2009 |
20100097299 | Plasma display device - A plasma display device. The plasma display is constructed with: a plasma display panel that displays visual images by using gas discharge; a chassis base that supports the plasma display panel; a driving board that applies a driving voltage to the plasma display panel; a connection wire connecting the driving board to an electrode included in the plasma display panel, and in which an electronic element is packaged; and a first member that adheres to the connection wire to absorb heat transmitted to the electronic element. | 04-22-2010 |
20100315393 | PLASMA DISPLAY DEVICE - A plasma display device with improved heat dissipation performance of a driver integrated circuit is disclosed. In one embodiment, the plasma display device includes i) plasma display panel configured to display an image, iii) a printed circuit board assembly, iii) a flexible printed circuit configured to electrically connect the printed circuit board assembly to the plasma display panel, wherein the flexible printed circuit comprises a metal layer and iv) a driver integrated circuit mounted in the flexible printed circuit and configured to control an electrode formed in the plasma display panel. The driver integrated circuit comprises: i) a base, ii) a plurality of output terminals connected to the base, and iii) a heat-conducting layer contacting 1) at least one of the plurality of output terminals and 2) the metal layer of the flexible printed circuit, wherein the heat-conducting layer and the metal layer are at least partially embedded in the flexible printed circuit. | 12-16-2010 |
Patent application number | Description | Published |
20120212141 | PWM CONTROLLING CIRCUIT AND LED DRIVER CIRCUIT HAVING THE SAME - A Light Emitting Diode (LED) driver circuit and a Pulse Width Modulation (PWM) controlling circuit thereof is provided. The LED driver circuit includes a voltage detector connected to a plurality of LED arrays, the voltage detector being configured to determine a connection status of each of the LED arrays according to a level of a feedback voltage of each of the LED arrays, and detect a minimum feedback voltage from the feedback voltage of each of the LED arrays that are determined to be connected, a controller configured to output a control signal to control boosting of the LED arrays according to the detected minimum feedback voltage, a PWM signal generator configured to output a PWM signal corresponding to the outputted control signal, and a driving voltage generator configured to supply a driving voltage commonly to the LED arrays according to the PWM signal. | 08-23-2012 |
20120313536 | LED DRIVER CIRCUIT HAVING A SENSING UNIT - A LED driving circuit having a sensing unit is disclosed. The LED driving circuit includes an input unit configured to receive a dimming signal to drive an LED array, a DC-DC converter including a power transistor configured to perform a switching operation, the DC-DC converter being configured to provide an output voltage to the LED array by the switching operation, a PWM signal generating unit configured to provide a PWM signal to adjust power of the LED array to the power transistor, a LED driving unit configured to drive the LED array using the dimming signal, and a sensing unit configured to sense degradation of the power transistor. | 12-13-2012 |
20130049614 | LED DRIVER APPARATUS - A Light Emitting Diode (LED) driver apparatus is provided. The LED driver apparatus includes: a Pulse Width Modulation (PWM) signal generator configured to generate a PWM signal, a DC-DC converter configured to provide a driving voltage of a plurality of LED arrays by using the generated PWM signal, and a sensor configured to determine whether at least one LED array among the plurality of LED arrays is in an open state in response to the driving voltage being higher than or equal to a preset first reference voltage, and the preset first reference voltage is higher than the driving voltage applied when the plurality of LED arrays are each in a working state. | 02-28-2013 |
20130050289 | LED DRIVER APPARATUS - A Light Emitting Diode (LED) driver apparatus and a method of driving an LED array are provided. A Light Emitting Diode (LED) driver apparatus includes: a DC-DC converter configured to supply a driving voltage to an LED array, a plurality of LED drivers configured to drive the LED array according to a dimming signal, in which the plurality of LED drivers are connected to one another in parallel to supply currents to the LED array. | 02-28-2013 |
20130147355 | DETECTING CIRCUIT FOR OPEN OF LED ARRAY AND LED DRIVER APPARATUS USING THE SAME - A detecting circuit and method thereof are configured to detect whether an LED array is open is described. The detecting circuit includes a resistance unit, a first switching unit, and an output unit. The resistance unit is operatively connected in series to the LED array. The switching unit is configured to be turned on when a voltage of the resistance unit is greater than or equal to a predetermined voltage level. The output unit is configured to produce an output indicative of whether the LED array is open, based whether the first switching unit is turned on. | 06-13-2013 |
20130147360 | LED DRIVER APPARATUS - A light-emitting diode (LED) driver apparatus is provided. The LED driver apparatus includes a pulse width modulation (PWM) signal generating unit, a DC-DC converter, and a comparison voltage generating unit. The PWM signal generating unit generates a PWM signal according to a comparison voltage. The DC-DC converter supplies a driving voltage of an LED array by using the PWM signal. The comparison voltage generating unit measures a feedback voltage of the LED array and supplies a difference between the measured feedback voltage and a target voltage as a comparison voltage to the PWM signal generating unit. The comparison voltage generating unit supplies a second reference voltage as a comparison voltage to the PWM signal generating unit from a time when the driving voltage is higher than or equal to a first reference voltage to a time when the driving voltage reaches the target voltage. | 06-13-2013 |
20130147361 | DETECTING CIRCUIT FOR SHORT OF LED ARRAY AND LED DRIVING APPARATUS USING THE SAME - A detection circuit configured to detect a short in a plurality of LED arrays is provided. The detection circuit includes a voltage measuring unit, a short detecting unit, and a detection control unit. The voltage measuring unit is configured to measure respective feedback voltages of the plurality of LED arrays and output a lowest measured feedback voltage as a first feedback voltage. The short detecting unit is configured to detect the short in the LED arrays using the measured feedback voltages. The detection control unit is configured to control the short detecting unit to stop short detection operation, when the first feedback voltage exceeds a first preset reference voltage. | 06-13-2013 |
20130293133 | LIGHT EMITTING DIODE DRIVER APPARATUS - A light emitting diode (LED) driver apparatus includes a pulse-width modulation (PWM) signal generator configured to generate a PWM signal according to a reference voltage. The LED driver apparatus also includes a DC-DC converter configured to provide a driving voltage to LED arrays based on the generated PWM signal, and a LED driver configured to drive the LED arrays through output ports. The LED apparatus includes a detector configured to detect whether the LED arrays are operatively connected to the corresponding output ports. | 11-07-2013 |
20140347030 | RAMP CIRCUIT AND DIRECT CURRENT (DC)- DC CONVERTER THEREOF - Provided are a ramp circuit and a DC-DC converter. The ramp circuit generates a current flowing in a resistor using voltages affected by an output voltage and an input voltage of a DC-DC converter, and generates a ramp signal through copying of the current and charging and discharging of a capacitor using a current mirror unit. The ramp signal is generated by considering the input voltage and the output voltage, and thus the ramp signal has an optimal slope to provide an adaptive response to state change in the input voltage and the output voltage. The DC-DC converter uses such a ramp circuit to facilitate its operation. | 11-27-2014 |