Abstract: Provided is a compact projection display with high throughput. The projection display includes: an illumination unit which irradiates a plurality of single color light beams; a first scanner scanning the plurality of light beams irradiated from the illumination unit along a first direction; a light modulator with a linear array of micro-electromechanical system (MEMS) devices that are arranged parallel to the first direction; an F-? lens disposed between the first scanner and the light modulator and having a first entrance pupil and a second entrance pupil; and a second scanner disposed opposite to the second entrance pupil of the F-? lens and which scans a light beam passing through the second entrance pupil of the F-? lens on a screen along a second direction that is orthogonal to the first direction.

Abstract: A compact rear projection display which can be used in mobile devices is provided. The compact rear projection display includes a main body unit which generates image signals, an image providing unit which forms and projects an image according to the image signals received from the main body unit, a transparent light guide plate, and a screen disposed at a surface of the transparent light guide plate. The transparent light guide plate guides the image incident from the image providing unit to be displayed on the screen.

Abstract: A projection display projects color images on a screen. The projection display includes: an illuminating unit which emits a plurality of linear beams that are in parallel to each other; a scroll unit which scrolls the plurality of linear beams; a line type light modulator which modulates the plurality of linear beams according to image signals; and a scan unit which scans the plurality of linear beams in a direction perpendicular to the scrolling direction.

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.

Abstract: A retro-reflect type light pipe, an illumination device including the same, and a projection display including the illumination device are provided. The retro-reflective type light pipe includes an incident portion through which light is incident, a guide portion which guides the incident light such that the incident light propagates internally therewithin while being reflected at inner walls thereof, and which thereby mixes the incident light thus providing uniform light. A retro-reflective portion, provided at one end of the guide portion, re-reflects the incident light toward the incident portion. The illumination device includes a light source, the retro-reflective type light pipe, and an optical path-changing member provided between the light source and the retro-reflective type light pipe, which changes the direction of the light emitted from the light source such that the light from the light source propagates toward the retro-reflective type light pipe.

Abstract: A slim optical projection system and an image display apparatus employing the same. The optical projection system includes: a relay lens group to produce an intermediate image from an image created by a display and to generate a first distortion in the intermediate image, a projection lens group to enlarge and project the intermediate image that passes through the relay lens group and to generate a second distortion in the projected image, and a reflector to reflect the image enlarged by the projection lens group to a screen at a wide viewing angle. The first and second distortions are used to compensate for a third distortion caused by the reflector.

Abstract: A retro-reflect type light pipe, an illumination device including the same, and a projection display including the illumination device are provided. The retro-reflective type light pipe includes an incident portion through which light is incident, a guide portion which guides the incident light such that the incident light propagates internally therewithin while being reflected at inner walls thereof, and which thereby mixes the incident light thus providing uniform light. A retro-reflective portion, provided at one end of the guide portion, re-reflects the incident light toward the incident portion. The illumination device includes a light source, the retro-reflective type light pipe, and an optical path-changing member provided between the light source and the retro-reflective type light pipe, which changes the direction of the light emitted from the light source such that the light from the light source propagates toward the retro-reflective type light pipe.

Abstract: A projection display includes: an illumination unit which irradiates a plurality of single color light beams; a first scanner scanning the plurality of light beams irradiated from the illumination unit along a first direction; a light modulator with a linear array of micro-electromechanical system (MEMS) devices that are arranged parallel to the first direction so as to turn a light beam scanned by the first scanner ON or OFF for each pixel; an F-? lens disposed between the first scanner and the light modulator and having a first entrance pupil on which a light beam scanned by the first scanner is incident and a second entrance pupil on which light beams modulated by the light modulator are incident; and a second scanner disposed opposite to the second entrance pupil of the F-? lens and which scans a light beam passing through the second entrance pupil of the F-? lens on a screen along a second direction that is orthogonal to the first direction.

Abstract: A projection display system includes a screen, an illumination projecting system to form an image using light radiated by a light source, to magnify the image, and to project the image along a rear side of the screen, and a reflection unit having an array of unit mirrors to reflect the image received from the illumination projecting system onto the screen, each of the unit mirrors having a first sloped reflection surface and a second reflection surface adjacent to the first reflection surface having a predetermined angle therebetween.

Abstract: An illuminator includes a concave mirror to reflect incident light in a predetermined direction, an inner reflective mirror provided on an optical axis of the concave mirror and having a reflective surface at least one surface thereof, a light source installed on at least one surface of the inner reflective mirror to generate and illuminate light, and a retro-reflective mirror provided at a focal point of the light reflected from the concave mirror, or in a vicinity of the focal point, and having an aperture through which some of the light illuminated from the light source and reflected by the concave mirror passes and a retro-reflective surface to reflect remaining light not passing through the aperture back toward the concave mirror.

Abstract: A projection display projects color images on a screen. The projection display includes: an illuminating unit which emits a plurality of linear beams that are in parallel to each other; a scroll unit which scrolls the plurality of linear beams; a line type light modulator which modulates the plurality of linear beams according to image signals; and a scan unit which scans the plurality of linear beams in a direction perpendicular to the scrolling direction.

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 compact rear projection display which can be used in mobile devices is provided. The compact rear projection display includes a main body unit which generates image signals, an image providing unit which forms and projects an image according to the image signals received from the main body unit, a transparent light guide plate, and a screen disposed at a surface of the transparent light guide plate. The transparent light guide plate guides the image incident from the image providing unit to be displayed on the screen.

Abstract: Provided is a projection television TV having a digital micro mirror device (DMD) which includes micro-mirrors to reflect light from a light source according to an ‘on’ or ‘off’ state of the micro mirrors. An illuminating block provides light to the DMD in a uniform optical intensity. A projecting block projects the light reflected from the DMD onto a screen. The projection TV features a projection aperture positioned in the projecting block or the illuminating block arranged perpendicularly to an optical axis. The projection aperture forms an optical path and includes projection areas to pass the light and blocking areas to block the light. The projection area and the blocking area are formed on a cross section of the light with a predetermined space.

Abstract: A projection apparatus including a polarization conversion system to convert light having a first polarization component; a color recycling system, which separates the light into first and second color lights, to transmit and reflect the first and second color lights; an image forming system including a first reflective panel and a second reflective panel, which respectively modulate the first and second color lights, and a third reflective panel, which modulates the third color light; and an optical path conversion system, which splits the optical paths of fourth and fifth color lights incident from the color recycling system such that the first color light in the fourth color light is directed to the first reflective panel, the second color light in the fifth color light is directed to the second reflective panel, and the third color light in the fourth and fifth color light is directed to the third reflective panel.

Abstract: An illuminator includes a concave mirror to reflect incident light in a predetermined direction, an inner reflective mirror provided on an optical axis of the concave mirror and having a reflective surface at least one surface thereof, a light source installed on at least one surface of the inner reflective mirror to generate and illuminate light, and a retro-reflective mirror provided at a focal point of the light reflected from the concave mirror, or in a vicinity of the focal point, and having an aperture through which some of the light illuminated from the light source and reflected by the concave mirror passes and a retro-reflective surface to reflect remaining light not passing through the aperture back toward the concave mirror.

Abstract: A slim optical projection system and an image display apparatus employing the same. The optical projection system includes: a relay lens group to produce an intermediate image from an image created by a display and to generate a first distortion in the intermediate image, a projection lens group to enlarge and project the intermediate image that passes through the relay lens group and to generate a second distortion in the projected image, and a reflector to reflect the image enlarged by the projection lens group to a screen at a wide viewing angle.

Abstract: An illumination unit includes a plurality of light source units to emit light beams having different wavelengths, and a synthesizing prism to synthesize the light beams emitted from the light source units to proceed on the same path.

Abstract: A projection display system includes a screen, an illumination projecting system to form an image using light radiated by a light source, to magnify the image, and to project the image along a rear side of the screen, and a reflection unit having an array of unit mirrors to reflect the image received from the illumination projecting system onto the screen, each of the unit mirrors having a first sloped reflection surface and a second reflection surface adjacent to the first reflection surface having a predetermined angle therebetween.