Reflective screen for front-projection television

• US 5,096,278 A
• Filed: 11/16/1990
• Issued: 03/17/1992
• Est. Priority Date: 06/25/1990
• Status: Expired due to Fees

• Current Assignee: Pioneer Electronic Corporation (Pioneer Corporation)
• Original Assignee: Pioneer Electronic Corporation (Pioneer Corporation)
• Inventors: Yoshioka, Takayuki, Yokoo, Toru
• Primary Examiner(s): WINTERCORN, RICHARD
• Application Number:
  US07/614,136
• Time in Patent Office: 487 Days
• Field of Search: 350/127-129
• US Class Current: 359/459
• CPC Class Codes: G03B 21/602 Lenticular screens G03B21/625 takes precedence

Abstract

The front surface of a lens plate is worked into lenticules extending in the vertical direction. A reflective material is provided in the rear of the lens plate. Black stripes are vertically formed on the back surface of the lens plate such that their pitch is increased from the center toward the right and left edges of the screen so that incident light emitted from CRTs or a liquid crystal projector and reflected light from the reflective material pass between the black stripes.

Claims

1. A reflective screen for use in a front-projection television in which said screen receives incident light emitted from projection means such as CRTs and a liquid crystal projector, comprising:

a lens plate having, at its front side, a first lenticular surface which includes a plurality of first lenticules extending in a first direction and arranged in a second direction which is perpendicular to said first direction;

a reflective material provided in the rear of said lens plate; and

black stripes formed on a back surface of said lens plate so as to extend in said first direction and to be arranged in said second direction.

2. The reflective screen according to claim 1, wherein a pitch of said black stripes is varied so that said incident light and reflected light from said reflective material pass between said black stripes.

3. The reflective screen according to claim 2, wherein said first direction is a vertical direction, and said pitch of said black stripes is increased from a center toward right and left edges of said screen.

4. The reflective screen according to claim 2, wherein said first direction is a horizontal direction and said screen is placed above said projection means, and wherein said pitch of said black stripes is increased from a bottom toward a top of said screen.

5. The reflective screen according to claim 2, wherein a width of said black stripes is kept substantially constant, and an interval of said black stripes is varied.

6. The reflective screen according to claim 1, wherein said reflective material is in close contact with said lens plate and said black stripes.

7. The reflective screen according to claim 1, wherein said lens plate has, at its back side, a second lenticular surface which includes a plurality of second lenticules extending in said first direction and arranged in said second direction between said black stripes.

8. The reflective screen according to claim 7, wherein each of said second lenticules includes a plurality of cylindrical surfaces arranged in said second direction.

9. The reflective screen according to claim 1, wherein said lens plate has, at its back side and between said black stripes, a plurality of micro-lens surfaces.

10. The reflective screen according to claim 1, further comprising a base material provided in the rear of said lens plate and having, at its front side, a Fresnel lens surface, wherein said reflective material is formed on said Fresnel lens surface of said base material.

11. The reflective screen according to claim 1, further comprising a transparent base material provided in the rear of said lens plate and having, at its back side, a Fresnel lens surface, wherein said reflective material is formed on said Fresnel lens surface of said base material.