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 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. The second prism includes a third incidence surface, through which the third light beam is incident, a fourth incidence surface, through which the first and second light beams emitted through the first emission surface are incident, a second emission surface, and a second selective reflection surface to reflect the third light beam and to transmit the first and second light beams toward the second emission surface.
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 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 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. Therefore, thermal concentration can be reduced and heat can be effectively discharged.
Abstract:
An illuminating unit includes a reflector including a parabolic reflecting surface and an incident portion and an exit portion intersecting with each other a light source to emit a beam onto the reflecting surface through the incident portion, a light source deviation compensator disposed between the reflector and the light source to focus an image of the light source is focused to a focal point of the reflecting surface, and a light path changer to direct at least a portion of a beam with a radiation angle less than an angle of the exit portion toward the reflecting surface.
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. The projection-type image display apparatus includes: a light source emitting light; a polarization beam splitter to transmit or reflect incident light according to a polarization direction; the color prism; first through fourth image forming devices disposed to face the outer surfaces of the first through third triangular prisms, and selectively modulates incident first through fourth light beams by pixels to form images and reflects the formed images to the color prism; and a projection lens unit to enlarge and project an incident image formed by the first through fourth image forming devices and synthesized by the color prism onto a screen.
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 display apparatus and a backlight assembly are provided. The display apparatus includes a display panel; and a backlight unit disposed on a rear surface of the display panel and discharging light to the display panel, the backlight unit comprising white light emitting diodes (LEDs) and Quantum Dot (QD) LEDs.
Abstract:
An illumination unit includes multiple light source units to emit light having different wavelengths, and a synthesizing prism to synthesize the emitted light. The synthesizing prism includes a first triangular prism (tp) having a first outer surface (os) to transmit (reflect) the light according to the light's input a direction, and first and second boundary surfaces (bs), a second tp having a second os to transmit the light, a third bs facing the second bs, and a fourth bs, a third tp having a third os to transmit (reflect) the light according the light's input direction, a fifth bs facing the fourth bs, and a sixth bs facing the first bs, and a color separation portion arranged at least one of positions between the second and third bs, the fourth and fifth bs, and the sixth and first bs, to selectively transmit (reflect) the light according to wavelengths thereof.