Abstract: An optical engine for a projection apparatus, according to an embodiment of the present invention, comprises an image data input unit, an optical source, an image generator, a projector which projects an image produced by the image generator and light reflected from the image generator onto a screen, an iris unit which controls the quantity of light passing through the projector, and a controller that regulates the optical source, the image generator, and the iris unit based on image data input by the image data input unit. The quantity of light passing through the iris unit can be varied to improve the brightness of the image being projected onto the screen.

Abstract: An optical engine apparatus magnifying and projecting an image beam formed by a display device on a screen, the optical engine apparatus including a light source having a bulb generating light and a reflection mirror reflecting the light provided adjacent to the bulb; and an optical filter inclinedly provided to reflect light components unnecessary for forming an image back to the light source, and to reflect the light components toward a lower portion of the reflection mirror which is positioned below the bulb. With this configuration, loss of light generated from a light source and projected to a display device is minimized, and brightness is improved. In addition, an optical path transformation unit is accommodated in an accommodation casing minimizing leaking of the light to thereby maintain good quality and protect from contamination due to dust or foreign substances.

Abstract: An optical engine apparatus to magnify and project an image beam formed by a display device using light on a screen includes a light source to emit the light, a reflection mirror to reflect the light emitted from the light source toward the display device, and an adjuster coupled to the reflection mirror to adjust an inclined angle of the reflection mirror to move the light reflected from the reflection mirror toward the display device in a desired direction. In the optical engine apparatus, a position of light projected on a display device can be easily adjusted.

Abstract: An apparatus for automatically correcting an earth magnetic field for a monitor includes: a peripheral magnetic field sensing unit for sensing a variation in a magnetic field and generating a corresponding frequency; a frequency producing unit for arithmetically operating the frequency generated from the peripheral magnetic field sensing unit and producing frequencies corresponding to each direction, a correction amount computing unit for computing each correction amount corresponding to the frequencies of each direction produced by the frequency producing unit; and a deflection correction unit for correcting a deflection error of the monitor as much as the corrected amount in the correction amount computing unit. By having such construction, a screen is automatically corrected by sensing a peripheral magnetic field with a small memory capacity, thereby attaining users' convenience in correcting an earth magnetic field and maintaining an optimum picture quality.