초록 ▼

An image display apparatus acquires a high-quality image by suppressing positional fluctuation of projected dots due to a positional offset of an optical path deflecting element. A spatial light modulation element (1) displays an image by projecting a light from an illumination light source. A proje

An image display apparatus acquires a high-quality image by suppressing positional fluctuation of projected dots due to a positional offset of an optical path deflecting element. A spatial light modulation element (1) displays an image by projecting a light from an illumination light source. A projection optical system (3) enlarges and projects the image formed on the spatial light modulation element (1). An optical path deflecting element (2) is provided between the spatial light modulation element (1) and the image formed on a screen (4) so as to deflect an optical path in accordance with a screen frame period. The optical path deflecting element (2) shifts the optical path for the image projected on the screen (4) at a high rate so as to apparently increase a number of picture elements. The optical path deflecting element (2) is located within the projection optical system.

대표청구항 ▼

The invention claimed is: 1. An image display apparatus, comprising: an illumination light source; a spatial light modulation element that displays an image; a projection optical system that enlarges and projects the image formed on the spatial light modulation element; an optical path deflecting e

The invention claimed is: 1. An image display apparatus, comprising: an illumination light source; a spatial light modulation element that displays an image; a projection optical system that enlarges and projects the image formed on the spatial light modulation element; an optical path deflecting element provided between said spatial light modulation element and the image formed on a screen by the projection optical system so as to deflect an optical path for the image projected on the screen in two directions in accordance with a screen frame period, said optical path deflecting element shifting the optical path for the image projected on the screen at a high rate so as to apparently increase a number of picture elements, wherein said optical path deflecting element is located within said projection optical system, and a distance between the two deflected optical paths on the screen is smaller than a picture element pitch of the image formed on the screen. 2. The image display apparatus as claimed in claim 1, wherein said optical path deflecting element is located at or in the vicinity of an aperture position of said projection optical system. 3. The image display apparatus as claimed in claim 1, wherein said optical path deflecting element is a reflection type optical path deflecting element. 4. The image display apparatus as claimed in claim 3, wherein said optical path deflecting element is a galvanometer mirror. 5. The image display apparatus as claimed in claim 3, wherein said optical path deflecting element is a mirror array having mechanically movable mirrors arranged tow-dimensionally. 6. The image display apparatus as claimed in claim 1, wherein a multiple screen display is performed by increasing an amount of a shift of picture elements acquired by said optical path deflecting element to be larger than a width of an arrangement of the picture elements in a direction of the shift of the picture elements. 7. The image display apparatus as claimed in claim 1, wherein said optical path deflecting element includes at least two sets of elements each of which shifts the picture elements in one direction so that the picture elements are shifted at a high rate in directions perpendicular to each other. 8. The image display apparatus as claimed in claim 1, wherein said optical path deflecting element is located at a position where the optical paths inside the projection optical system are substantially parallel to each other. 9. A projection optical system for projecting a light modulated by a spatial light modulation element onto a projected surface, comprising: a plurality of lenses; an optical path deflecting element; and a drive part that drives the optical path deflecting element, wherein said optical path deflecting element is provided between a lens on a side of said spatial light modulation element and a lens on said projected surface, wherein said optical path deflecting element is driven to deflect the optical path by an amount of shift smaller than a picture element pitch of the image on the projected surface. 10. The projection optical system as claimed in claim 9, further comprising an aperture member, wherein said optical path deflecting element is located adjacent to said aperture member. 11. The projection optical system as claimed in claim 9, further comprising an aperture member, wherein said optical path deflecting element is provided in an opening part of said aperture member. 12. The projection optical system as claimed in claim 9, wherein said optical path deflecting element includes a mirror and a drive part that drives the mirror, and said drive part changes a inclination angle between an optical axis and a mirror surface of said mirror so as to deflect a projecting direction of a light. 13. The projection optical system as claimed in claim 12, wherein the inclination angle of said mirror is changed at least in two axial directions. 14. The projection optical system as claimed in claim 9, wherein said optical path deflecting elements includes two optical path deflecting elements that are arranged so that directions of deflecting the optical path by the two optical path deflecting elements are perpendicular to each other. 15. An image display apparatus comprising: the projection optical system as claimed in claim 9; and an illumination light source projecting the light to the spatial light modulation element. 16. The projection optical system as claimed in claim 9, wherein said optical path deflecting element is located at a position where the optical paths inside the projection optical system are substantially parallel to each other.