Abstract: A display device includes a light source, a liquid crystal display (LCD) panel, a dimming panel provided between the light source and the LCD panel, having a plurality of cells, and transmitting light received from the light source to the LCD panel at an individual light transmission rate for each cell, and a control unit calculating the light transmission rate for the each cell using image brightness information on each pixel in an area of the LCD panel corresponding to the each cell of the dimming panel, transmitting a control signal to the dimming panel so that the each cell has the individual light transmission rate, and transmitting image information for each pixel to the LCD panel.

Abstract: A display apparatus includes a display panel and a backlight which supplies the display panel with light. The backlight unit includes a lighting source; a light converting unit which converts light emitted from the lighting source into uniform light; and a light incidence angle controlling unit which increases an angle of incidence of the light entering the light converting unit.

Abstract: A display apparatus which uses a laser to realize a clear image by reducing speckle noise is provided. The display apparatus comprises a laser light source which emits light a scanning mirror which scans light emitted by the laser light source, a speckle removing mirror which periodically reciprocates within a predetermined rotating angle, and projects the light scanned by the scanning mirror, to a screen, and an image processor which processes image data to shift an image by frame corresponding to the rotation of the speckle removing mirror.

Abstract: A display apparatus includes a display panel, and a backlight unit to supply light to the display panel. The backlight unit includes a light source, a light deflecting unit to deflectively scan light irradiated from the light source, and a light reflecting unit to reflect the light scanned by the light deflecting unit toward the display panel. According to the display apparatus, the number of parts in the backlight unit is reduced, thereby allowing a structure of the backlight unit to be simplified and allowing a thickness of the display apparatus to be reduced.

Abstract: A projection display includes first through third light source units to radiate first through third light beams, respectively, having different colors, an X-cube prism to combine paths of the first through third light beams, an optical modulator to sequentially modulate the first through third light beams according to image information, and a projection lens unit to magnify and project the modulated light beams onto a screen. Each of the first through third light source units includes at least one optical module. The optical module includes a collimator having a first reflective surface in a parabolic shape, and a compact light source located in the vicinity of a focal point of the first reflective surface.

Abstract: A projection display including first through third light source units to radiate first through third light beams having different colors, respectively, a light path combining unit to combine paths of the first through third light beams, an optical modulator to sequentially modulate the first through third light beams according to image information, and a projection lens unit to magnify and project the modulated light beams onto a screen. The light path combining unit includes first and second prisms. The first prism includes first and second incidence surfaces, through which the first and second light beams are incident, respectively, a first emission surface, and a first selective reflection surface to transmit the second light beam toward the first emission surface.

Abstract: A light source and an image apparatus which can reduce a rainbow effect and a color separation phenomenon in a pixel are provided. A different waveform is provided according to a color of the light source and methods of driving the light source and the image apparatus, respectively. The light source outputs beams of one or two colors from among three primary colors in a corresponding pixel section of a first scan section, in two scan sections for generating an entire image composed of a plurality of pixel images, to generate each pixel image and outputs a beam or beams of the remaining color or colors among the three primary colors in a corresponding pixel section of a second scan section.

Abstract: A display device having a uniform brightness and control method thereof are provided, which includes a circuit board having a light emitting diode mounting area, a light source unit comprising a plurality of light emitting diodes mounted to the light emitting diode mounting area so that light emitting characteristics can be symmetrical around the center of the light emitting diode mounting area, a light uniformizing unit for creating a uniform light from the light emitting diodes, a micro display unit located in front of the light uniformizing unit, a projection lens unit located in front of the micro display unit, and a screen located in front of the projection lens unit. Thus, the display device provides uniform brightness and color.

Abstract: A color prism capable of separating incident light into four color beams and synthesizing incident four-color beams, and a projection-type image display apparatus employing the color prism. The color prism includes: first through third triangular prisms each having two boundary surfaces which face the other two triangular prisms, and an outer surface which transmits or reflects incident light according to an incidence angle of the light; and first through third dichroic filters respectively interposed among the first through third triangular prisms and selectively transmits or reflects incident light according to wavelength so as to separate incident light into first through fourth light beams according to wavelength ranges and synthesize incident first through fourth light beams.

Abstract: A liquid crystal display device comprising an LCD panel, a light guiding plate disposed in back of the LCD panel and a plurality of LEDs disposed on a plane in parallel with the LCD panel along a lateral side of the light guiding plate and arranged in two rows or more is provided. With this configuration, color mixing efficiency is enhanced while size of the display device is kept to a minimum.

Abstract: A liquid crystal display and control method thereof, having a liquid crystal display panel, a light emitting diode device which is disposed on the rear of the liquid crystal display panel and which is divided into a plurality of partitioned areas that are capable of being driven independently, a light guide part disposed for each of the partitioned areas, an image calculating part for dividing the liquid crystal display panel into a plurality of regions and calculating the brightness of each region by using image data, and an inverter and an inverter controller to provide differentiated power to the partitioned areas based on the calculated brightness.

Abstract: An illumination unit is provided which includes a glass rod including a parabolic reflection surface, a light incident surface facing the parabolic reflection surface, a concave portion formed inwardly in the light incident surface at a position of a focal point of the parabolic reflection surface, and a light guide portion facing the parabolic reflection surface and having a rectangular section. An LED module is disposed at the focal point of the parabolic reflection surface and emitting light to the parabolic reflection surface through the concave portion. A surface of the light guide portion parallel to the light incident surface is stepped from the light incident surface in a direction in which the rectangular section of the light guide portion decreases.

Abstract: An illumination system and a projection system capable of enhancing light efficiency and contrast. The projection system includes a display panel from which light incident to a projection lens unit is controlled according to the rotation of a plurality of micromirrors and an asymmetric stop which adjusts an angle of effective light incident from the display panel. The illumination system emitting light to the projection system includes: one or more light source units each including a single or an array of light emitting devices and having a light exit surface with an aspect ratio different from an aspect ratio of the display panel; and an aspect ratio adjusting unit adjusting the aspect ratio of the light such that the aspect ratio of the light exit surface of each of the light source units can be equal to the aspect ratio of the display panel.

Abstract: A light source module and an image projection apparatus employing the same are provided. The light source module includes: a light-emitting chip installed on a base to generate and emit illuminating light and having reflectivity to reflect light incident on the light-emitting chip; a reflection mirror coupled with the base to reflect the light coming from the light-emitting chip toward a front direction; and a polarization alignment unit installed on an exit end of the reflection mirror to feed back a portion of light incident on the polarization alignment unit by reflection and to polarize the light coming from the light-emitting chip in one direction and output the polarized light, wherein the fed back light of the light incident on the polarization alignment unit is reflected back to the polarization alignment unit by at least one of the reflection mirror and the base.

Abstract: An illumination unit and an image projection apparatus having the same are provided. The illumination unit includes: at least one light source unit which radiates a collimated light beam; an optical integrator which converts the collimated light beam from the at least one light source unit into a uniform light beam; and a condensing lens system, disposed between the at least one light source unit and the optical integrator, which reduces a cross-section of the collimated light beam emitted from the at least one light source unit and then guides the collimated light beam with the reduced cross-section to the optical integrator and has a 1:1 conjugate property between an object and an image of the object.

Abstract: An illumination unit and an image projection apparatus employing the same. The illumination unit includes: a first reflective surface reflecting light incident thereon; a light-emitting device generating and emitting illuminating light; and a second reflective surface reflecting light emitted from the light-emitting device to a light source surface that includes the light-emitting device.

Abstract: An illuminating unit having a plurality of light emitting devices and collimators and a projection type image display apparatus using the same are provided. The illuminating unit includes: a plurality of light emitting devices which output light beams of predetermined wavelengths; a plurality of collimators, each having a parabolic reflection surface for reflecting the light beam in a predetermined direction, a mounting section for locating the light emitting device at the focal point of the parabolic reflection surface, a light output surface opposite to the parabolic reflection surface, and a light guide section for guiding the light beam reflected from the parabolic reflection surface to the light output surface; and one or more fixing members having two or more steps for mounting the light emitting devices and the collimators on their top surface. A plurality of light emitting devices and collimators are efficiently arranged in a small space.

Abstract: A projection-type 3-D image display device includes a single display element, a polarization conversion switch, a first image shifter, a second image shifter, a projection lens unit, a mirrored light tunnel, and a screen unit. The screen unit includes an image separation unit. The single display element emits light polarized in a first polarization direction according to an input image. The polarization conversion switch time-sequentially converts the first polarization direction of the light emitted by the display element into a second polarization direction. The first image shifter transmits the light having the first polarization direction to form a first image and refracts the light having the second polarization direction to form a second image. The second image shifter faces the first image shifter and is arranged apart from the first image shifter by a predetermined interval. The projection lens unit enlarges and projects the first and second images.

Abstract: An LED package having improved light efficiency, and an illumination system and a projection system employing the LED package. An LED package to provide light to a display panel having a plurality of rotatable micromirrors to form images, the LED package includes a substrate and a plurality of LED chips. The plurality of LED chips are slanted with respect to the substrate at a predetermined angle. The LED package improves the light efficiency by arranging the plurality of LED chips so as to correspond to a shape of effective light having an asymmetric distribution with respect to a stop of a projection lens unit.

Abstract: An illumination unit includes first, second, third, and fourth light source units to emit first, second, third, and fourth light beams of different wavelength bands, and a hexahedral color synthesis prism to synthesize the first, second, third, and fourth light beams emitted from the first, second, third, and fourth light source units to propagate the first, second, third, and fourth light beams can propagate along the same path with respect to each other.