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US 2003/0197837 A1Published application
Optical system and display device using the same
AssigneeLG Electronics Inc.
InventorSeung Gyu Lee
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AssigneeLG Electronics Inc.
InventorSeung Gyu Lee
Estimating the term…
There is provided a display device in which an optical efficiency is improved using a color drum. The display device includes a road lens for totally reflecting an incident light and changing a path of the light. The display device further includes a color drum having a plurality of cell filters arranged cylindrically to face the path of the light outputted from the road lens. Here, the cell filters are in a linear shape. Since the light reflected by the color drum is not lost to the outside, the light efficiency can be enhanced. According to the invention, the linear scroll is possible due to the cell filters that are in the linear shape, so that signal process algorithm can be simplified.
An optical system comprising:
A display device of magnifying and projecting a small-sized image to display a large-sized image, the device comprising:
A display device of magnifying and projecting a small-sized image to display a large-sized image, the device comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Colour photography, other than mere exposure or projection of a colour film: sequential recording or projection
Lamp housings: homogenising, shaping of the illumination light
For displaying the colours sequentially, e.g. by using sequentially activated light sources: by using a sequential colour filter producing two or…
Apparatus or arrangements for taking photographs or for projecting or viewing them
Term end not estimated
1. Field of the Invention
The present invention relates to a device for displaying a large-sized image, and more particularly, to a display device in which the optical efficiency is enhanced by using a color drum.
2. Description of the Related Art
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:
FIG. 1 illustrates a conventional projector in which color filters are attached to an image display device;
FIG. 2 illustrates a conventional projector in which a micro lens is attached to an image display device;
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
FIG. 7 is a schematic view of a projector that includes a color drum according to a preferred embodiment of the present invention.
Referring to FIG. 7, the projector includes a lamp system 410 for generating light and converging the generated light around a focus, a road lens 420 for totally reflecting the light inputted from the lamp system 410, changing a path of the light and outputting the lights, a scroll unit 430 having cell filters arranged orderly in a cylindrical construction and facing the path of the light so as to transmit the light outputted from the road lens 420 selectively, a converging lens 440 for converging the light transmitted through the scroll unit 430, an image display device 450 for expressing colors by using the light of the converging lens 440 according to an applied electric signal, and a projecting system 460 for magnifying and projecting the colors expressed by the image display device 450. Here, the scroll unit 430 is preferably provided with a color drum 436 that is rotatable by a motor 432.