Abstract: A driving method for local dimming of a Liquid Crystal Display (LCD) device and an apparatus using the same are disclosed.

Abstract: A method for dividing a display area for local dimming of LCD is disclosed. The method includes determining an initial number of pixels per data analysis area and a total number of residual pixels, calculating a first residual pixel sum of a current data analysis area using the total number of residual pixels and a second residual pixel sum of a previous data analysis area, determining whether to assign a residual pixel to the current data analysis area using the first residual pixel sum and the total number of data analysis areas, calculating a second residual sum of the current data analysis area whether to assign a residual pixel, and repeating the calculation above until the data analysis area index is a last data analysis area index.

Abstract: An apparatus and method for driving a liquid crystal display minimizes a gray loss of an image displayed on an RGBW-type display device, and enhances brightness and image quality. The apparatus for driving the LCD device includes: a liquid crystal panel including a plurality of unit pixels composed of 4-color sub-pixels; a data driver to transmit a video data signal to individual sub-pixels; a gate driver to transmit a scan pulse to the sub-pixels; a data converter to generate a histogram using a gray difference of input 3-color source data, to convert the 3-color source data into 4-color data according to a gain value extracted from the histogram, and to output the 4-color data; and a timing controller to transmit the 4-color data received from the data converter to the data driver and to control the gate driver and the data driver.

Abstract: A method and an apparatus for driving a display device including a histogram calculator to calculate a histogram of pixel data for an input image and a data stretching curve generator, which divides the histogram into n (n being a positive integer above 2) gray level areas to generate a data stretching curve for each gray level area of which a gradient is determined in proportion to a total number of pixel data accumulated for each of the gray level areas, and modulates the pixel data of the input image with the generated data stretching curve.

Abstract: An apparatus and method for driving an LCD device is provided. The apparatus includes an LCD panel that is comprised of red, green, blue and white sub-pixels. A data converter converts input data of three colors into input data of four colors. A data driver converts the input data of four colors into a video signal, and supplies the video signal to each sub-pixel. A gate driver supplies a scan pulse to each sub-pixel. A timing controller arranges the input data of four colors supplied from the data converter and then supplies the arranged data to the data driver. A backlight unit is comprised of LEDs of at least five colors to emit the light to the LCD panel. A backlight controller controls the backlight unit in accordance with the input data of three colors and the sub-frame control signal.

Abstract: An apparatus and method for controlling luminance in an liquid crystal display device includes: a liquid crystal display panel having at least two designated areas; at least two lamp units irradiating light the designated areas of the liquid crystal display panel; an arithmetic unit configured to scan image pixels within each of the designated areas of the liquid crystal display panel, to extract a peak value of the gray level of pixels, and to calculate an average peak value for each designated area; and a lamp driver configured to control the lamp units, irradiating light to each designated area, based on the average peak value.

Abstract: A liquid crystal display device capable of improving reliability of a backlight unit is disclosed. The liquid crystal display device includes: a backlight dimming modulating unit configured to modulate an internal algorithm backlight dimming control signal using an external input algorithm backlight dimming control signal and to maintain a dimming duty equal to or wider than an allowable dimming range of a backlight unit; an arithmetic unit configured to multiply the external input algorithm backlight dimming control signal by the modulated internal algorithm backlight dimming control signal and to output a final backlight dimming control signal; and a data modulating unit configured to modulate image data using the external input algorithm backlight dimming control signal corresponding to the modulated final backlight dimming control signal.

Abstract: A liquid crystal display (LCD) and corresponding driving method. The LCD includes a liquid crystal display panel for displaying images, a gate driver and a source driver for supplying scan signals and analog pixel signals to gate and data lines of the liquid crystal panel, a backlight unit having a side radiation type LED array that is driven sectionally by a plurality of unit areas to irradiate light to the liquid crystal display panel, and a luminance controller for controlling a luminance of the LED array by unit areas according to surrounding units areas.

Abstract: A luminance control apparatus of a liquid crystal display device (LCD) is presented. The LCD includes a liquid crystal display panel divided into areas, lamps, an arithmetic unit, and a lamp driver. Fewer lamps are present than the number of areas. The arithmetic unit scans pixels of each area, extracts a peak value of the gray level of pixels of the area, and calculates a maximum peak brightness value and an average value of the area. The lamp driver controls the brightness of the lamps in accordance with the average value and the maximum peak brightness value.

Abstract: Systems, methods and apparatus provided for driving the memory of a liquid crystal display device that is capable of reducing the number of frame memories include the steps of storing a current frame data in an input line memory at a first speed; storing the data stored in the input line memory in a frame memory at a second speed faster than the first speed; storing a previous frame data stored in the frame memory in an output line memory at the second speed; and comparing the current frame data with the previous frame data, the previous frame data being outputted from the output line memory at the first speed and selecting a predetermined modulation data in accordance with the result of the comparison.

Abstract: A driving method and apparatus of a liquid crystal display device is described. Data from a current frame is compressed and delayed by a frame memory. Compressed data of the current frame and the compressed data of a previous frame from the frame memory are restored. The restored data of the previous frame is compared with the restored data of the current frame to determine a modulated portion for the current frame in accordance with the comparison result. The current frame data is modulated by adding the modulated portion to the current frame data. Only a single frame memory is disposed within the driving apparatus.

Abstract: A driving system for a liquid crystal display device includes a system unit to supply image data to be displayed on a liquid crystal panel, the system unit generating a system dimming signal, an inverter unit to control luminance of a backlight unit, the inverter unit receiving the system dimming signal, and a control unit to control display of images on the liquid crystal panel, the control unit receiving the system dimming signal from the inverter unit and outputting a control dimming signal to the inverter unit, wherein the inverter unit adjusts luminance of the backlight unit using the control dimming signal input from the control unit.

Abstract: A method of driving a liquid crystal display device includes inputting source image data, each of which has one of m gray level values, wherein m is a natural number, defining T error data from the source image data, wherein the error data have top k gray level values, and T and k are a natural number, generating conversion image data having larger gray level values than the source image data using one having a largest gray level value from the source image data excluding the error data, inputting the conversion image data to a liquid crystal panel, controlling a brightness of a backlight unit in accordance with the conversion image data, forming a bitmap corresponding to the conversion image data, wherein the bitmap shows positional distribution of pixels with the error data, counting error areas by scanning the bitmap, wherein each of the error areas includes the predetermined number of the pixels having the error data, and controlling the T according to the number of the error.

Abstract: An apparatus for driving a liquid crystal display device includes a liquid crystal display panel having liquid crystal cells in respective regions defined by a plurality of gate and data lines, a data driver providing video signals to the data lines, a gate driver providing scan signals to the gate lines, a timing controller controlling the gate and data drivers, and generates a plurality of dimming signals by resetting a dimming curve in accordance with input data, and a light emitting diode backlight unit driving light emitting diode groups in accordance with the plurality of dimming signals to provide light to the liquid crystal display panel.

Abstract: A method of driving a liquid crystal display device includes compressing a current frame data, storing the compressed current frame data in a frame memory, outputting a compressed data of a previous frame from the frame memory, restoring the compressed data of the previous frame, and comparing the restored data of the previous frame with the current frame data, and modulating the current frame data into a predetermined modulated data based on the comparison result.

Abstract: An apparatus and method for driving an LCD device is provided. The apparatus includes an LCD panel that is comprised of red, green, blue and white sub-pixels. A data converter converts input data of three colors into input data of four colors. A data driver converts the input data of four colors into a video signal, and supplies the video signal to each sub-pixel. A gate driver supplies a scan pulse to each sub-pixel. A timing controller arranges the input data of four colors supplied from the data converter and then supplies the arranged data to the data driver. A backlight unit is comprised of LEDs of at least five colors to emit the light to the LCD panel. A backlight controller controls the backlight unit in accordance with the input data of three colors and the sub-frame control signal.

Abstract: A mobile display device driving apparatus and method which can reduce power consumption are disclosed. The driving apparatus includes a liquid crystal panel having a plurality of liquid crystal cells each formed in sub-pixel areas of four colors, a battery charged with a voltage, a power saving mode signal generator that detects the remaining power of the battery and generates a power saving mode signal based on the detected power to set a power saving mode of the liquid crystal panel. A controller sets a gain value in response to the power saving mode signal, converts external three-color input data into four-color data based on the set gain value and generates a dimming signal in response to the power saving mode signal. A panel driver displays an image based on the four-color data on the liquid crystal panel.

Abstract: A backlight unit includes a light-emitting surface having N divided regions, N being a positive integer and the divided regions being symmetrically arranged along a vertical center line and a horizontal center line of the light-emitting surface, one of a plurality of fluorescent lamps in each of the divided regions, each of the fluorescent lamps having at least one bent portion and two electrodes respectively at two ends thereof, and an LED lamp arranged along one of the vertical center line and the horizontal center line and at a region where bent portions of the fluorescent lamps meet.

Abstract: An overdriving circuit for a liquid crystal display device, includes a system signal treating unit configured to treat an image data to generate a present frame data, a frame memory configured to store a former frame data used for treating the image data in the system signal treating unit, an overdriving unit configured to modulate the present frame data using the frame memory and a modulation data of a look-up table, and a liquid crystal panel configured to receive the modulated frame data and to display images.