Patent application number | Description | Published |
20090021848 | APPARATUS AND METHOD OF DRIVING PIEZOELECTRIC ACTUATOR FOR AUTO-FOCUS - There is provided an apparatus for driving a piezoelectric actuator moving a lens for auto-focus, the apparatus including: a lens position sensing unit sensing a position of the lens and generating a sensed lens position value; a lens control unit comparing the sensed lens position value with a target lens position value for auto-focus to determine a moving direction of the lens; and an actuator driving unit generating an actuator driving signal for driving the piezoelectric actuator to move the lens in the moving direction determined by the lens control unit, wherein the lens control unit temporarily stops the operation of the actuator driving unit, and receives the sensed lens position value corresponding to the lens position sensed by the lens position sensing unit and compares the sensed lens position value with the target lens position value while the operation of the actuator driving unit is temporarily stopped. | 01-22-2009 |
20110074754 | DEVICE FOR GENERATING RGB GAMMA VOLTAGE AND DISPLAY DRIVING APPARATUS USING THE SAME - The present invention relates to a device for generating RGB gamma voltage and a display driving apparatus using the same. The device for generating RGB gamma voltage includes: an RGB gamma compensation voltage output unit that outputs a plurality of R, G, B gamma compensation voltage corresponding to gamma compensation data with respect to R, G, and B signals; a multiplexer that receives the R, G, and B gamma compensation voltages among the outputted gamma compensation voltages one by one and selects and outputs any one gamma compensation voltage among the R, G, and B gamma compensation voltages in accordance with an RGB selection control signal; and a multiplexer controller that generates an RGB selection control signal corresponding to an output order of the R, G, and B signals and transmits the generated signal to the multiplexer and controls the signal outputted from the multiplexer in accordance with the RGB selection control signal. | 03-31-2011 |
20110074805 | MEDIAN FILTER, APPARATUS AND METHOD FOR CONTROLLING AUTO BRIGHTRNESS USING THE SAME - The present invention provides an automatic brightness control device including an illuminance sensing unit for sensing an external illuminance value in real time; a brightness classifying unit for classifying the illuminance value sensed in real time by the illuminance sensing unit into two or more configured brightness levels by comparing the sensed illuminance value with a reference illuminance value; a median filter unit for filtering a median value among the brightness levels classified by the brightness classifying unit; a gamma curve selecting unit for selecting a gamma curve which corresponds to the median value filtered by the median filter unit; and an illuminance control unit for controlling illuminance according to the gamma curve selected by the gamma curve selecting unit. | 03-31-2011 |
20110150359 | CURRENT LIMITATION METHOD OF DISPLAY DEVICE - A current limitation method of a display device includes: calculating a brightness average in each frame of an inputted image; calculating a brightness difference between successive frames of the image by using the calculated brightness average, and calculating a cumulative average brightness value by cumulating the brightness average with respect to the frames included in a frame length which is varied depending on the brightness difference; converting the cumulative average brightness value into a preset brightness adjustment value; and adjusting the brightness of the inputted image according to the brightness adjustment value. | 06-23-2011 |
20110169817 | APPARATUS FOR COMPENSATING FOR DETERIORATION IN AMOLED - There is provided an apparatus for compensating for deterioration in an active matrix organic light-emitting diode. An apparatus for compensating for deterioration in an active matrix organic light-emitting diode being operated by a pixel driving unit may include: a switching control unit being synchronized with an operation of the pixel driving unit to thereby generate a switching control signal in order to compensate for deterioration in a pixel; and a switch circuit unit connected between an anode of the active matrix organic light-emitting diode and a terminal of a deterioration compensation voltage, being turned on or off according to the switching control signal from the switching control unit, and supplying the deterioration compensation voltage to the anode of the active matrix organic light-emitting diode while being turned on. | 07-14-2011 |
20110292029 | Apparatus and method for driving e-paper panel - Disclosed herein are an apparatus and a method for driving an e-paper panel. The e-paper panel driving apparatus includes a DC/DC converter that converts and outputs DC voltage to be input into a preset voltage and supplies the output voltage as a driving voltage of an e-paper panel; a sensing module that senses load conditions of the e-paper panel; and a control module that varies the driving frequency of the DC/DC converter according to the load conditions of the e-paper panel sensed by the sensing module. According to the present invention, the driving clock of the DC/DC converter that supplies the driving voltage to the e-paper panel is varied in consideration of the load conditions of the e-paper panel, thereby making it possible to prevent an image quality of the e-paper panel from being degraded due to unstable power supply, while simultaneously minimizing unnecessary power consumption of the e-paper panel driving apparatus. | 12-01-2011 |
20110316825 | ORGANIC ELECTROLUMINESCENCE DISPLAY - Disclosed herein is an organic electroluminescence display. The organic electroluminescence display includes: a plurality of pixels arranged in a matrix format on a display panel and configured of first to N+K-th rows; a plurality of first data lines connected to pixels each in the same column of pixels in the first to N-th rows; a plurality of second data lines connected to pixels each in the same column of pixels in the k+1-th to N+K-th rows; and a plurality of pixel driving buffers sensing time constants of the second data lines and compensating for data currents according to the number of sensed time constants to drive the respective corresponding first data lines with the compensated data currents. The organic electroluminescence display can reduce operation deviation between the pixels according to parasitic components of the data lines. | 12-29-2011 |
20120044235 | ACTIVE MATRIX ORGANIC LIGHT EMITTING DIODE DISPLAY - There is provided an active matrix organic light emitting diode display, including a data driver converting pre-prepared correction data into an analog correction signal and generating a driving signal according to the analog correction signal, a selector selecting a charging path for programming, according to the driving signal in a preset programming period and selecting a deterioration detection path in a preset emission period, a pixel unit including an organic light-emitting diode connected between a power supply receiving power and a ground, charging a value corresponding to the correction data according to the driving signal in the programming period, and allowing current to flow to the organic light-emitting diode according to the charged value in the emission period, and an ADC detecting deterioration voltage having deterioration information of the organic light-emitting diode of the pixel unit in the emission period. | 02-23-2012 |
20120044360 | DETERIORATION SENSING APPARATUS FOR DISPLAY DEVICE - Disclosed is a deterioration sensing apparatus for a display device, capable of rapidly sensing deterioration by pre-charging a sensing voltage in adjacent pixels while a deterioration of a single pixel is sensed in a display device having a plurality of pixels, in, particular, an organic light emitting diode panel. | 02-23-2012 |
20120056869 | ORGANIC LIGHT EMITTING DIODE DRIVER - There is provided an organic light emitting diode driver capable of compensating for pixel deterioration in real time during the driving of pixels by selectively compensating pixels, requiring compensation, for the deterioration thereof. The organic light emitting diode driver includes: a converter converting input data into compensation data used to selectively compensate for pixel deterioration according to whether or no the input data has been calibrated; a driver driving pixels of a pixel unit according to the compensation data from the converter; and a compensator providing the converter with a deterioration compensation signal according to deterioration information obtained from a pixel driven by the driver. | 03-08-2012 |
20130162144 | LIGHT EMITTING DIODE DRIVING APPARATUS - Provided is an LED driving apparatus. The LED driving apparatus includes a plurality of LED groups each comprising one or more diodes, a switch group comprising a plurality of switch units connected respectively to the LED groups to drive the connected LED group when a control signal is activated, and a switch controlling unit configured to compare an input voltage of the LED groups with an output voltage of the LED groups, calculate a comparison value, and generate the control signal according to the comparison value. Accordingly, the LED driving apparatus drives the LED groups selectively according to the difference between the input voltage of the LED group and the output voltage of the LED group, thereby overcoming the problem of heat generation by forward voltage distribution. | 06-27-2013 |