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 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. The image apparatus includes a light source, an optical modulation device receiving beams from the light source and modulating the received beam into image components, a reflector receiving the image components from the optical modulation device and scanning the received image components onto a screen, and a control unit controlling the light source to output beams of one or two colors among three primary colors in a corresponding pixel section of a first scan section and output 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, wherein the first scan section and the second scan section are for generating an entire image composed of a plurality of pixel images.
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:
An image display method of improving brightness of an output image in an image display device using a sequential driving method and a plurality of single-color light sources. The image display method includes extracting a white color component from the primary color image signals, calculating a period to display the white color component, converting the primary color image signals into shortened primary color image signals and a white color image signal based on the period to display the white color component, and driving the single-color light sources together during a period to display the white color image signal and sequentially driving the single-color light sources during a period to display the shortened primary color image signals. The brightness of output images is improved by displaying the white color image signal by simultaneously driving the single-color light sources based on a ratio of a lowest gradient to a highest gradient of the primary color signals.
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 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 image display method of improving brightness of an output image in an image display device using a sequential driving method and a plurality of single-color light sources. The image display method includes extracting a white color component from the primary color image signals, calculating a period to display the white color component, converting the primary color image signals into shortened primary color image signals and a white color image signal based on the period to display the white color component, and driving the single-color light sources together during a period to display the white color image signal and sequentially driving the single-color light sources during a period to display the shortened primary color image signals. The brightness of output images is improved by displaying the white color image signal by simultaneously driving the single-color light sources based on a ratio of a lowest gradient to a highest gradient of the primary color signals.
Abstract:
A projection-type image display apparatus using a light emitting diode light source including a compact optical arrangement. The projection-type image display apparatus includes an illumination optical system including a light emitting diode light source to produce light and emit the light produced in one direction, a uniform light illumination unit disposed along a first optical path to change a propagation direction of the light emitted from the illumination optical system and to emit uniform light, a display device to form an image from the light emitted from the uniform light illumination unit, and a projection optical system disposed along a second optical path to enlarge and project the image formed by the display device onto a screen, wherein the first optical path along which the uniform light illumination unit is disposed and the second optical path along which the projection optical system is disposed are parallel or substantially parallel to each other.
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. The color synthesis prism includes first, second, third, and fourth entrance surfaces, an exit surface through which the first, second, third, and fourth beams are propagated along the same path, a first dichroic mirror to reflect the first beam incident through the first entrance surface toward the exit surface and to transmit the second, third, and fourth beams, a second dichroic mirror to reflect the second beam incident through the second entrance surface toward the exit surface and to transmit the first, third, and fourth beams, and a third dichroic mirror to reflect the fourth beam incident through the fourth entrance surface toward the exit surface and to transmit the first, second, and third beams. A projection type image display apparatus includes the illumination unit, an image-forming device to create an image corresponding to an input image signal from first, second, third, and fourth light beams propagated from the illumination unit, and a projection lens unit to enlarge and project the image created by the image-forming device onto a screen.