Projector with projection lens having a zoom function

• US 7,070,286 B2
• Filed: 09/19/2001
• Issued: 07/04/2006
• Est. Priority Date: 09/20/2000
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Koyama, Fumio
• Primary Examiner(s): Perkey, W. B.
• Assistant Examiner(s): Cruz, Magda
• Application Number:
  US09/955,162
• Publication Number:
  US 20020080289A1
• Time in Patent Office: 1,749 Days
• Field of Search: 353/101, 353/69, 353/121, 345/88, 345/98, 345/600, 345/589, 345/602, 345/690, 349/5
• US Class Current: 353/101
• CPC Class Codes: H04N 9/3182 Colour adjustment, e.g. white balance, shading or gamut white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607

Abstract

A projector in accordance with the invention includes a projection lens having a zoom function that forms a projected image corresponding to an image signal on a screen, a zoom state detection section that detects a zoom state of the projection lens, and an uneven color correction section that performs uneven color correction on the image signal based on a detected zoom state.

Claims

1. A projector for use with a screen, comprising:

a projection lens having a zoom function that forms a projected image, corresponding to an image signal, on the screen;

a zoom state detection section that detects a zoom state of the projection lens; and

an uneven color correction section that performs uneven color correction on the image signal based on the zoom state detected by said zoom state detection section.

2. The projector according to claim 1, the uneven color correction section including a memory in which uneven color correction data according to the zoom state is stored.

3. The projector according to claim 2, the uneven color correction section including a control circuit and an uneven color correction circuit, the memory storing and holding first and second uneven color correction data according at least to first and second zoom states, the control circuit calculating the uneven color correction data in a zoom state between the first and second zoom states based on the first and second uneven color correction data, and the uneven color correction circuit performing uneven color correction on the image signal using the calculated uneven color correction data.

4. The projector according to claim 1, further comprising a light valve that modulates at least one of transmitted light and reflected light according to the image signal.

5. A method of correcting uneven color of a projector that forms a projected image corresponding to an image signal on a screen by a projection lens having a zoom function, the method comprising:

detecting a zoom state of the projection lens; and

performing uneven color correction on the image signal in accordance with the detected zoom state of the projection lens.

6. The method of correcting uneven color of a projector according to claim 5, further comprising:

calculating uneven color correction data according to the detected zoom state; and

performing the uneven color correction on the image signal using the calculated uneven color correction data.

7. The method of correcting uneven color of a projector according to claim 6, the uneven color data calculation step including selecting uneven color correction data corresponding to the detected zoom state from a plurality of sets of uneven color correction data corresponding to previously stored and held zoom states.