Abstract: A digital micro-mirror assembly for an optical projection system includes a DMD module with a control board. The control board is provided with a first fixing member, and a DMD is mounted on one side of the control board. A DMD holder resiliently supports a perimeter of the DMD, and an optical holder is provided with a second fixing member to support the DMD module. A fastening member is engaged with the first and the second fixing members to integrally connect the DMD module and the optical holder.

Abstract: An optical assembly for a projection system includes a light tunnel, a light tunnel holder that supports the light tunnel, an exterior casing that supports the light tunnel holder, a resilient member disposed between the light tunnel holder and the exterior casing to resiliently support the light tunnel holder, and an aligning unit that is disposed opposite the resilient member to align the light tunnel. The aligning unit can have at least one holder protrusion formed on an outer surface of the light tunnel holder, and a movable member that has a pressing protrusion for contact with the holder protrusion. The movable member slides on the outside of the light tunnel holder.

Abstract: A device for controlling the projection lens shift in a projector is provided, and includes a projection lens module which enlarges and projects an incident light on a screen, a sliding bracket which supports the projection lens module, a fixed bracket which slidably supports the sliding bracket, a shift unit positioned between the fixed bracket and the sliding bracket selectively to slide the sliding bracket up and down according to its rotating direction, and an elastic unit provided at a lower part of the projection lens module elastically to support the projection lens module.

Abstract: A projection television including: a light source emitting light; a light source accommodator accommodating the light source; an optical engine unit disposed in front of the light source accommodator, and mounted with a light tunnel passing the light emitted from the light source there through; a light source housing mounted between the light source accommodator and the optical engine unit, and accommodating the light source accommodator; and a positioning part disposed between the light source accommodator and the optical engine unit, and defining a position of the light source with respect to the optical engine unit, and the positioning part comprising a positioning projection formed in one of the light source accommodator and the optical engine unit, and a positioning groove formed to correspond to the positioning projection in the other of the light source accommodator and the optical engine unit and coupled to the positioning projection.

Abstract: A projection television includes a light source, a fan to supply air to the light source, an exhaust duct disposed adjacent to the light source and having an inlet through which the air is taken in, an outlet through which the air cooling the light source is emitted, and a curved part to connect the inlet and the outlet, and a plurality of veins separately provided inside the exhaust duct. The projection television with the exhaust duct prevents the light generated from the light source from being externally exposed and controls the air to flow smoothly.

Abstract: An optical engine apparatus to magnify and project an image beam formed by a display device on a screen includes a light source to emit light, an optical path transformation unit provided on an optical path between the light source and the display device to transform a path of the light from the light source toward the display device, and an accommodating unit in which the optical path transformation unit is accommodated, to form the path of the light in the optical path transformation unit. With this configuration, the optical engine apparatus minimizes a loss of the light generated from the light source and projected to the display device, and improves a brightness of a picture corresponding to the image beam. The optical path transformation unit is accommodated in an accommodation casing to minimize leaking of the light thereby maintaining a good quality of the picture and protecting the optical engine apparatus from contamination due to dust or foreign substances.

Abstract: A device for controlling the projection lens shift in a projector is provided, and includes a projection lens module which enlarges and projects an incident light on a screen, a sliding bracket which supports the projection lens module, a fixed bracket which slidably supports the sliding bracket, a shift unit positioned between the fixed bracket and the sliding bracket selectively to slide the sliding bracket up and down according to its rotating direction, and an elastic unit provided at a lower part of the projection lens module elastically to support the projection lens module.

Abstract: A projection lens apparatus of a projector and a method of assembling same has a main lens barrel provided with a first projection lens that expands and projects an image that is incident thereto, and a reflection group that reflects the incident image towards the first projection lens group, a rear lens barrel provided with a second reflection group that projects the incident image towards the reflection group, the rear lens barrel being connected to the main lens barrel to move forward and backward to adjust an optical axis of the image as projected, and a pressing mechanism elastically pressing the rear lens barrel with respect to the main lens barrel in the direction of optical axis, thereby maintaining the rear lens barrel at a predetermined position so that the second projection lens group is not deviated from the optical axis.

Abstract: A projection lens apparatus of a projector and a method of assembling same has a main lens barrel provided with a first projection lens that expands and projects an image that is incident thereto, and a reflection group that reflects the incident image towards the first projection lens group, a rear lens barrel provided with a second reflection group that projects the incident image towards the reflection group, the rear lens barrel being connected to the main lens barrel to move forward and backward to adjust an optical axis of the image as projected, and a pressing mechanism elastically pressing the rear lens barrel with respect to the main lens barrel in the direction of optical axis, thereby maintaining the rear lens barrel at a predetermined position so that the second projection lens group is not deviated from the optical axis.