Projection optical system
First Claim
1. A projection optical system for obliquely performing enlargement projection of an image formed on a display device surface onto a screen surface, wherein a plurality of reflective surfaces are provided, at least one of which is a curved reflective surface having an optical power, and wherein, letting the curved reflective surface, out of said at least one curved reflective surface, having a largest effective optical region be the largest curved reflective surface, the reflective surface other than the largest curved reflective surface is slightly decentered with the largest curved reflective surface kept in a fixed state so as to perform pixel shift on the screen surface in a vertical direction, or a horizontal direction, or an oblique direction, or vertical and horizontal directions within a range of a pixel pitch.
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Accused Products
Abstract
In a projection optical system for obliquely performing enlargement projection of an image formed on a display device surface onto a screen surface, a plurality of reflective surfaces are provided, at least one of which is a curved reflective surface having an optical power. Letting the curved reflective surface, out of said at least one curved reflective surface, having the largest effective optical region be the largest curved reflective surface, the reflective surface other than the largest curved reflective surface is slightly decentered with the largest curved reflective surface kept in a fixed state so as to perform pixel shift on the screen surface in a vertical direction, or a horizontal direction, or an oblique direction, or vertical and horizontal directions within the range of a pixel pitch.
48 Citations
16 Claims
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1. A projection optical system for obliquely performing enlargement projection of an image formed on a display device surface onto a screen surface,
wherein a plurality of reflective surfaces are provided, at least one of which is a curved reflective surface having an optical power, and wherein, letting the curved reflective surface, out of said at least one curved reflective surface, having a largest effective optical region be the largest curved reflective surface, the reflective surface other than the largest curved reflective surface is slightly decentered with the largest curved reflective surface kept in a fixed state so as to perform pixel shift on the screen surface in a vertical direction, or a horizontal direction, or an oblique direction, or vertical and horizontal directions within a range of a pixel pitch.
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15. An image projection apparatus comprising:
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a display device; and
a projection optical system for obliquely performing enlargement projection of an image formed on a display device surface onto a screen surface, wherein a plurality of reflective surfaces are provided, at least one of which is a curved reflective surface having an optical power, and wherein, letting the curved reflective surface, out of said at least one curved reflective surface, having a largest effective optical region be the largest curved reflective surface, the reflective surface other than the largest curved reflective surface is slightly decentered with the largest curved reflective surface kept in a fixed state so as to perform pixel shift on the screen surface in a vertical direction, or a horizontal direction, or an oblique direction, or vertical and horizontal directions within a range of a pixel pitch. - View Dependent Claims (16)
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Specification