Abstract: The optical system includes: a first optical group which performs a zoom function using a first movable lens, a second optical group which performs a focus function using a second movable lens, and a third optical group which performs a wide angle function by reflecting light passing through the first optical group and the second optical group, wherein a first intermediate image is formed between the first optical group and the second optical group.

Abstract: Provided is a front reflection screen for a front projection display apparatus. The front reflection screen includes a reflection layer configured to reflect an incident light including an image light projected from a projector and an external light, and a tint layer disposed before the reflection layer and including light absorbing particles to block a portion of the incident light.

Abstract: Three-dimensional (3D) glasses according to the present disclosure are interconnected to a 3D display apparatus and include: a glass unit, a glass driving unit which drives the glass unit, an infrared (IR) sensor unit which receives a sync signal transmitted from the 3D display apparatus, a window unit which, when the 3D glasses are directed to the 3D display apparatus, transmits the sync signal to the IR sensor unit and transmits external IR light, incident from a direction different from the direction of the 3D display apparatus, away from the IR sensor unit, and a controlling unit which controls the glass driving unit based on the sync signal.

Abstract: Provided is a front reflection screen for a front projection display apparatus. The front reflection screen includes a reflection layer configured to reflect an incident light including an image light projected from a projector and an external light, and a tint layer disposed before the reflection layer and including light absorbing particles to block a portion of the incident light.

Abstract: A projection apparatus includes an image projection unit configured to form an image and project the formed image, a screen unit configured to display the image projected from the image projection unit, and a mounting unit on which the image projection unit and the screen unit are integrally mounted. The screen unit is formed to have a curvature.

Abstract: A projection screen is provided, which includes a reflective layer having plural reflective patterns which are spaced apart from one another and each of which includes an image reflective surface having an inclination angle against a horizontal direction so as to guide an image light toward a front of the screen, and plural external light absorption layers absorbing external lights incident to the screen.

Abstract: An illuminating unit and a display apparatus including the illuminating unit are provided. The illuminating unit generates and emits light to a display element of the display apparatus, and includes a light source; a uniformizing unit which uniformizes light from the light source and includes a plurality of uniformizing lenses arranged on an optical path; a condensing unit which condenses light from the uniformizing unit to emit the light to the display element and includes a plurality of condensing lenses sequentially arranged on the optical path, and the uniformizing unit and the condensing unit are arranged based on a width of one of a plurality of cell lenses forming the uniformizing lens and a width of an image displayed in the display element.

Abstract: A dust collecting structure for an air-cooling electric apparatus includes a plurality of first vortex generating members which are disposed at a predetermined interval in a case and form a plurality of suction inlets; and a plurality of second vortex generating members which are disposed in an inner direction of the case and are spaced a predetermined distance apart from the suction inlets, wherein each of the first vortex generating members projects inside the case and has a shape that allows the air, which is sucked through the suction inlets by a suction fan, to generate a vortex near a rear end of the first vortex generating member, and wherein each of the second vortex generating members has a shape that divides the air into air streams and allows the air streams to generate a vortex near a rear end of the second vortex generating member.

Abstract: An air-cooling apparatus which cools an imaging unit with a plurality of LCD panels and a polarizer assembly includes a cooling fan, and a cooling duct which directs air expelled from the cooling fan onto the plurality of LCD panels and the polarizer assembly, and the cooling duct includes a plurality of channels corresponding to the plurality of LCD panels, and at least two channels from among the plurality of channels are bent in a vertical direction.

Abstract: An optical system is provided. The optical system includes a luminous system which comprises a plurality of light source devices and an image unit; and a projection system which receives light having an image through the luminous system, and enlarges and projects the light, wherein the plurality of light source devices comprise a reflection member which reflects light beam emitted from the light source devices, and are disposed so that the light beam emitted from the light source devices is reflected by the reflection member one time and enters to the image unit.

Abstract: A touch sensing system which senses a touch position on a screen, including a light source to emit light; a light deflection unit to deflect the light emitted from the light source, a light guide plate which is arranged opposite to the screen and guides the light deflected by the light deflection unit to different positions on the screen according to an incident position, a light detector to receive at least part of the light reflected in a touch position on the screen, and a controller to calculate the touch position on the screen based on a point of time when the light detector detects the light.

Abstract: A projection screen is provided, which includes a reflective layer having plural reflective patterns which are spaced apart from one another and each of which includes an image reflective surface having an inclination angle against a horizontal direction so as to guide an image light toward a front of the screen, and plural external light absorption layers absorbing external lights incident to the screen.

Abstract: A projector is provided. The projector includes a projection unit which projects an image, a case which supports the projection unit, a reflecting mirror which includes a reflecting surface which faces the projection unit and has a curvature, and reflects light, a first fixing part which is disposed on a center axis of the reflecting minor on an outer area of the reflecting surface, and a second fixing part and a third fixing part which are disposed on the outer area of the reflecting surface and which form a triangle with the first fixing part. Each of the first, second, and third fixing parts is configured to fix the reflecting mirror to the case.

Abstract: Provided are an apparatus and method for displaying a document, the document display apparatus including an image processor which displays a document including a plurality of pages; a memory unit which stores individual unit elements constituting the document and image data including the individual unit elements; and a controller which controls the image processor to generate the image data corresponding to at least one page estimated to be turned to among the plurality of pages, store the image data in the memory unit, and display the image data corresponding to a requested page among the stored image data when a user requests a page transition. With this, the page transition speed may be improved through image caching.

Abstract: A dust collecting structure for an air-cooling electric apparatus includes a plurality of first vortex generating members which are disposed at a predetermined interval in a case and form a plurality of suction inlets; and a plurality of second vortex generating members which are disposed in an inner direction of the case and are spaced a predetermined distance apart from the suction inlets, wherein each of the first vortex generating members projects inside the case and has a shape that allows the air, which is sucked through the suction inlets by a suction fan, to generate a vortex near a rear end of the first vortex generating member, and wherein each of the second vortex generating members has a shape that divides the air into air streams and allows the air streams to generate a vortex near a rear end of the second vortex generating member.

Abstract: An illuminating unit and a display apparatus including the illuminating unit are provided. The illuminating unit generates and emits light to a display element of the display apparatus, and includes a light source; a uniformizing unit which uniformizes light from the light source and includes a plurality of uniformizing lenses arranged on an optical path; a condensing unit which condenses light from the uniformizing unit to emit the light to the display element and includes a plurality of condensing lenses sequentially arranged on the optical path, and the uniformizing unit and the condensing unit are arranged based on a width of one of a plurality of cell lenses forming the uniformizing lens and a width of an image displayed in the display element.

Abstract: Three-dimensional (3D) glasses according to the present disclosure are interconnected to a 3D display apparatus and include: a glass unit, a glass driving unit which drives the glass unit, an infrared (IR) sensor unit which receives a sync signal transmitted from the 3D display apparatus, a window unit which, when the 3D glasses are directed to the 3D display apparatus, transmits the sync signal to the IR sensor unit and transmits external IR light, incident from a direction different from the direction of the 3D display apparatus, away from the IR sensor unit, and a controlling unit which controls the glass driving unit based on the sync signal.

Abstract: A display panel includes a plurality of light guides which emit received light, and a plurality of external light blocking members which are disposed between exit surfaces of the plurality of light guides, and block light from the outside. Accordingly, the bright room contrast of the PDP is enhanced.

Abstract: An air-cooling apparatus which cools an imaging unit with a plurality of LCD panels and a polarizer assembly includes a cooling fan, and a cooling duct which directs air expelled from the cooling fan onto the plurality of LCD panels and the polarizer assembly, and the cooling duct includes a plurality of channels corresponding to the plurality of LCD panels, and at least two channels from among the plurality of channels are bent in a vertical direction.

Abstract: The optical system includes: a first optical group which performs a zoom function using a first movable lens, a second optical group which performs a focus function using a second movable lens, and a third optical group which performs a wide angle function by reflecting light passing through the first optical group and the second optical group, wherein a first intermediate image is formed between the first optical group and the second optical group.