Projector with improved screen

A projector comprising:

• a light source;
• at least one space modulation element arranged to receive the light from said light source for producing a modulated light;
• at least one projection lens arranged to receive the modulated light for projecting the modulated light;
• a screen arranged to receive the light projected by the projection lens for producing an image thereon, the screen having a first light distribution characteristic for vertical polarized light and a second light distribution characteristic for horizontal polarized light whereby the first light distribution characteristic differs from the second light distribution characteristic the screen including at least in part a transparent member having optical anisotropy and at least one optical axis;
• and
• wherein there is the relationship of .DELTA.PH<0.1 where R, G, and B in the following parentheses are representative of red, green and blue components,
• A(R), A(G), and A(B) are the amounts of the light projected onto the screen as a first polarized light,
• B(R), B(G), and B(B), are the amounts of the light projected onto the screen as a second polarized light perpendicular to the first polarized light, A(R)>B(R), A(G)>B(G), and A(B)>B(B),
• G(R,p), G(G,p), and G(B,p) are the gains of the screen for a third polarized light,
• G(R,s), G(G,s), and G(B,s) are the gains of the screen for a fourth polarized light perpendicular to the third polarized light, G(R,p).gtoreq.G(R,s), G(G,p).gtoreq.G(G,s), and G(B,p).gtoreq.G(B,s), and
• .DELTA.(R)=›A(R).times.G(R,p)+B(R).times.G(R,s)!-›A(R).times.G(R,s)+B(R).ti mes.G(R,p)!
• .DELTA.(G)=›A(G).times.G(G,p)+B(G).times.G(G,s)!-›A(G).times.G(G,s)+B(G).ti mes.G(G,p)!
• .DELTA.(B)=›A(B).times.G(B,p)+B(B).times.G(B,s)!-›A(B).times.G(B,s)+B(B).ti mes.G(B, p)!
• .DELTA.PH=.vertline..DELTA.(R)-A(B).vertline.+.vertline..DELTA.(G)-.DELTA.( B).vertline..
• 12.

A projector comprising:

• a light source;
• at least one space modulation element arranged to receive the light from said light source for producing a modulated light;
• at least one projection lens arranged to receive the modulated light and for projecting the modulated light;
• a screen arranged to receive the light projected by the projection lens for producing an image thereon, the screen having a first light distribution characteristic for a vertical linearly polarized light and a second light distribution characteristic for a horizontal linearly polarized light, the first light distribution characteristic differing from the second light distribution characteristic, the screen including at least in part, a transparent member having optical anisotropy and at least one optical axis;
• and
• wherein the light projected by the projection lens and made incident to the screen is a generally non-polarized light defined by the relationship of (A.times.P+B.times.S).ltoreq.1.1 (A.times.S+B.times.P)
• where P and S are gains of the screen in the first and second light distribution characteristics at a particular distribution angle at which it is desired to obtain a clear image, with P.gtoreq.S, and
• A and B are the amounts of the linearly polarized lights projected to the screen, with A.gtoreq.B.

A projector comprising:

• a light source;
• at least one space modulation element arranged to receive the light from said light source for producing a modulated light;
• at least one projection lens arranged to receive the modulated light for projecting the modulated light;
• a screen arranged to receive the light projected by the projection lens for producing an image thereon, the screen having a first light distribution characteristic for vertical polarized light and a second light distribution characteristic for horizontal polarized light whereby the first light distribution characteristic differs from the second light distribution characteristic, the screen including at least in part a transparent member having optical anisotropy and at least one optical axis;
• and
• wherein the modulated light diverging from substantially one point on the at least one space modulation element is in a generally regularly polarized state with respect to a diverging angle, and
• a polarized light converting element is provided for converting a generally regularly polarized light with respect to the diverging angle into an irregularly polarized light with respect to the diverging angle.