Abstract: A display apparatus includes: a display panel; a light source unit which comprises a light source and has a plurality of division areas which are separated and independently driven each other, and is located at the back of the display panel; a drive unit which supplies drive power for the light source unit; and a light source controller which controls the drive unit so that the drive power can be supplied sequentially to the division areas which are divided in a first direction, in synchronization with a scanning period for which one frame of an image signal is displayed, and a lighting period of the division areas can be changed according to the kind of the image signal which is displayed on the display panel.

Abstract: A display apparatus and a backlight scanning method thereof are provided. The display apparatus having a backlight illuminator includes a parameter generator for generating parameters indicative of motion features of a video signal; and a backlight driver for driving the backlight illuminator by generating a scanning signal which has a plurality of scanning pulses during a frame period and is adjusted according to the parameters generated at the parameter generator. The display apparatus and the backlight scanning method thereof drive the backlight by generating the scanning signal which has the plurality of the scanning pulses during the frame period and is adjusted according to the motion features of the video signal to be displayed, to thereby effectively mitigate the motion blur and the flicker.

Abstract: A backlight unit, includes: a surface light source which emits a light; and a diffusion collimation member which is provided in a path of the light emitted by the surface light source, and comprises a first diffusion sheet having a plurality of first reflectors arranged in a first direction and a second diffusion sheet formed on the first diffusion sheet and having a plurality of second reflectors arranged in a second direction forming a predetermined angle with respect to the first direction of the first diffusion sheet.

Abstract: A highly efficient lighting system, a scrolling unit, and a projection system adopting the highly efficient lighting system and the scrolling unit are provided. The scrolling unit has at least one lens cell. From the viewpoint of light incident upon the at least one lens cell, the rotation of the at least one lens cell is converted into a rectilinear motion of a lens array, such that incident light is scrolled. The projection system includes a light source, an optical splitter, at least one scrolling unit, and a light valve. The optical splitter splits light emitted from the light source according to wavelength. The at least one scrolling unit has at least one lens cell. The lens cell has an incident side and an emitting side and divides incident light into light beams. The rotation of the lens cell causes a rectilinear motion of the light beams, thereby scrolling incident light.

Abstract: A contrast compensation apparatus and a method thereof utilize a simplified hardware structure and a low contrast distortion. The contrast compensation apparatus includes a pixel value detection unit to detect a distribution of pixel values of respective pixels of an input image signal, a pixel value limit unit having pre-set luminance limit values and re-configuring the distribution of the pixel values of the respective pixels based on the pre-set luminance limit values, and a mapping unit to set luminance for the respective pixels based on a cumulative distribution function with respect to the re-configured pixel values. When certain portions of an image are rendered very bright or dark, the phenomenon in which the entire image becomes abruptly bright or dark is reduced. Further, the contrast compensation apparatus uses the minimum number of multipliers, adders, and subtractors only, thus having an advantage of simplified structure and using less electric power.

Abstract: A display apparatus and method in which a current ripple is decreased to improve characteristics of a display apparatus are provided. A display apparatus comprises a light source, a plurality of driving power units providing driving electric powers to the light source, and a controller controlling the plurality of the driving power units so that electric currents of the driving electric powers provided from the respective driving power units have a predetermined phase difference from each other.

Abstract: A 3-dimensional image is generated from an input 2-dimensional image based upon illuminative characteristics of the input image by filtering the 2-dimensional input image with filters of different orientations, outputting base shading images corresponding to the filters, extracting positive pixel values for each base shading image, calculating a difference between the pixel values of the input image and the extracted positive pixel values, calculating a median value of the calculated difference, selecting the filter to output a base shading image of smallest median, outputting a shading image by filtering the input image with the selected filter, combining the input image with the shading image and outputting the 3-dimensional image based upon the combined image. A previously selected filter for a preceding image can be considered when selecting a filter for a current image, enabling generation of 3-dimensional moving pictures.

Abstract: Provided is a load driving device controlling a drive of a load including a driver for periodically turning on/off a current according to a switching clock signal and supplying a average driving current to the load. Further provided is a dimming controller for controlling the driver to turn on/off the drive of the load based on a dimming step. Also provided is a controller for controlling at least one of the driver and the dimming controller so as to make a step interval of the dimming step and a switching clock period of the switching clock signal the same. A load driving device is provided that is capable of stably controlling the dimming of a drive of a load, by improving a linear response characteristic of a driving current according to a dimming control.

Abstract: A liquid crystal display (LCD) and method of adjusting brightness for the LCD are provided. The LCD includes a light emitter including a plurality of luminescent bodies which are divided into a predetermined number of partial areas, a backlight driver connected to the light emitter to control the brightness of each of the partial areas of the light emitter, and a controller for calculating a representative value for adjusting the brightness of each of the partial areas of the light emitter in accordance with an input image signal and outputting the representative value as a brightness adjustment signal for adjusting the brightness of each of the partial areas to the backlight driver. Thus, the brightness of each of partial areas of a backlight can be adjusted in accordance with the input image signal to improve a contrast ratio.

Abstract: Disclosed is a plasma display panel. The plasma display panel comprises a lower substrate and an upper substrate, which are spaced apart by a predetermined distance from each other to define a plurality of discharge cells therebetween; a plurality of barrier ribs disposed between the lower substrate and the upper substrate; a plurality of address electrodes formed in parallel with one another on an upper surface of the lower substrate; a plurality of discharge electrodes formed in a direction crossing the address electrodes on a lower surface of the upper substrate; and a fluorescent layer formed on an inner wall of the discharge cells, wherein the upper substrate comprises a plurality of light guides, which are formed in parallel with the plurality of address electrodes to focus and output visible light generated from the discharge cells by a discharge, the light guides having a light incident surface.

Abstract: An apparatus and method for controlling emission of light are provided. The light emitting apparatus comprises a plurality of first light emitting parts which are connected with each other in series, a first current supply which supplies a current to the plurality of first light emitting parts, a plurality of switches which are respectively connected with the plurality of first light emitting parts in parallel to make the current be transmitted to or bypass the first light emitting parts and a controller which receives brightness information corresponding to the respective first light emitting parts and controls the plurality of first switches to make overall light emitting time of the first light emitting parts within time intervals correspond to a brightness level of the brightness information.

Abstract: A liquid crystal display is provided. The liquid crystal display device comprises a light source unit, a light converting unit receiving light from the light source unit and converting a polarization property and a brightness distribution of the provided light, a screen receiving the light from the light converting unit and improving a frontal brightness of the provided light and a liquid crystal display panel disposed in front of the screen. Thus, the present invention provides a liquid crystal display having a good light efficiency without using an expensive optical film.

Abstract: A display apparatus including a backlight with an LED and a brightness adjusting method which is capable of accomplishing uniform brightness across the entire display screen are provided. A display apparatus comprising a backlight comprising a plurality of LEDs and a plurality of current supplying parts respectively supplying a driving current to the LEDs, comprises a light sensor receiving light generated from the LEDs, and a controlling part controlling the current supplying parts to selectively drive the LEDs, and adjusting the amount of the driving current of the current supplying parts to be supplied to the driven LED so that the intensity of light received to the light sensor corresponds to a predetermined reference value.

Abstract: A display apparatus having a liquid crystal panel, comprises a light source part comprising a plurality of point light sources for supplying light to the liquid crystal panel. The light source part is partitioned into a plurality of light source zones. A light source driving part supplies power to the light source part. A plurality of channel parts sense luminescence of the point light sources for each of the light source zones and output light-emission information of the point light sources based on the sensed luminescence. A controller compares the light-emission information output from the plurality of channel parts with a pre-set reference value. If a difference between the light-emission information and the reference value is out of a predetermined allowable range, the controller sequentially adjusts PWM control signals which are output to the light source driving part, for each of the light source zones.

Abstract: A quantization error compensation includes a dividing unit to divide an input current image signal into a first high-frequency signal and a low-frequency signal; a changing unit to replace bits of the first high-frequency signal with a predetermined signal to output a second high-frequency signal; an adding unit to add the low-frequency signal and the second high-frequency signal to create a composite signal; a quantization unit to cut n number of bits of the composite signal and to output the cut composite signal and the n number of bit signal; an equalizing unit to output a brightness equalizing value of the cut composite signal; a calculating unit to calculate a compensation value using the n number of the bit signal and a difference between brightness equalizing values with respect to a current and next brightness levels; and a compensation unit to add the compensation and the current brightness equalizing values.

Abstract: A display device and method for supplying stable electric power for a light source are provided. A display device comprises a plurality of light sources, a variable electrical power supply which supplies electric power for the light sources, a switching unit which is connected in series with the light sources, and a controller which controls the variable electrical power supply so that voltage across both ends of the switching unit is consistently held in relation to voltage across both ends of the light sources.

Abstract: The present invention provides a display apparatus and method supplying power to a light source where driving power is supplied to the light source, a main power path is provided through which the driving power is supplied from the power supply to the light source, a standby power path is branched from the main power path and returned to the power supply, a switching unit selects the driving power to be supplied from the power supply to either of the main power path or the standby power path, a standby power adjuster adjusts standby power applied to the standby power path and a controller controls the standby power adjuster to make the standby power be within an allowable range when the power is not applied to the main power path. Accordingly, a display apparatus and method which prevent a standby power from being continuously boosted up when a light source is turned off, thereby improving a display performance thereof are provided.

Abstract: A display apparatus and method in which a current ripple is decreased to improve characteristics of a display apparatus are provided. A display apparatus comprises a light source, a plurality of driving power units providing driving electric powers to the light source, and a controller controlling the plurality of the driving power units so that electric currents of the driving electric powers provided from the respective driving power units have a predetermined phase difference from each other.

Abstract: Provided is a display apparatus that includes a light source, that further includes a current generator for outputting a predetermined driving current. Further provided is a first path for supplying the driving current output by the current generator to the light source and a second path for intercepting the driving current supplied to the light source. In addition, a switch is provided for supplying the driving current output by the current generator either to the first path or to the second path and a controller is provided for controlling the switch to supply the driving current output by the current generator to the first path while the light source is turned on, and to supply the driving current to the second path while the light source is turned off. Thus, the present invention provides a display apparatus which improves a response time of electrical current when a light source is turned on and off, and thereby improves display quality.

Abstract: A display apparatus is provided to operate a light emitting unit with a small number of power drivers. The display apparatus has a plurality of light emitting units, a power driver, whose total provided therein is less than the total of light emitting units, that outputs driving power to the light emitting units. A power switch is switched on and off to supply the driving power to one of the plurality of light emitting units, and a controller controls the power switch to sequentially supply the driving power to the plurality of light emitting units.