Color reproduction system for making color display of four or more primary colors based on input tristimulus values

• US 20050162572A1
• Filed: 03/03/2005
• Published: 07/28/2005
• Est. Priority Date: 05/26/1999
• Status: Active Grant

• Current Assignee: Olympus Optical Company Ltd. (Olympus Corporation)
• Original Assignee: Olympus Optical Company Ltd. (Olympus Corporation)
• Inventors: Ajito, Takeyuki, Ohsawa, Kenro, Yamaguchi, Masahiro, Ohyama, Nagaaki
• Granted Patent: US 7,511,715 B2
• Time in Patent Office: Days
• US Class Current: 348/745
• CPC Class Codes: G09G 3/001 using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H04N 9/3105 for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10

Abstract

A display apparatus includes a color image projection unit and a screen. The color image projection unit includes a converter which receives image signals of three primary colors, and converts the received image signals of three primary colors into image signals of four or more primary colors, and a color image projector which includes a plurality of image projection devices having respective primary colors, and which receives the image signals of four or more primary colors, and projects the received image signals of four or more primary colors onto the screen. The color image projector is capable of physically adjusting positions of the image signals of four or more primary colors, which are projected onto the screen such that the positions of the image signals are coincident with each other.

Claims

1. A display apparatus comprising a color image projection unit and a screen, wherein:

the color image projection unit comprises;

converting means for receiving image signals of three primary colors, and converting the received image signals of three primary colors into image signals of four or more primary colors, and

color image projection means which comprises a plurality of image projection devices having respective primary colors, and which receives the image signals of four or more primary colors, and projects the received image signals of four or more primary colors onto the screen; and

the color image projection means is capable of physically adjusting positions of the image signals of four or more primary colors, which are projected onto the screen such that the positions of the image signals are coincident with each other.

3. A display apparatus according to claim 1, wherein the converting means converts the received image signals of three primary colors into the image signals of four or more primary colors by using a look-up table.

4. A display apparatus according to claim 3, wherein the look-up table is prepared by:

determining an area to which the received image signals of three primary colors belong, among a plurality of areas into which a three-dimensional space of the three primary colors is divided, and

converting the received image signals of three primary colors into color image signals of respective primary colors in the look-up table on the basis of a conversion parameter corresponding to positions of the received image signals of three primary colors in the determined area.

2. A display apparatus comprising:

a plurality of color image projection devices having different color characteristics;

converting means for receiving image signals of three primary colors, and converting the received image signals of three primary colors into image signals of four or more primary colors; and

a screen which diffuses light projected from the plurality of color image projection devices,

wherein the converting means outputs at least two of the image signals of four or more primary colors to a first color image projection device of the plurality of color image projection devices, and outputs at least a remaining two of the image signals of four or more primary colors to a second color image projection device of the plurality of image projection devices; and

wherein the plurality of color image projection devices project color images to superimpose the color images on each other on the screen, such that positions of the color images are coincident with each other.

5. A display apparatus according to claim 2, wherein the converting means converts the received image signals of three primary colors into image signals of four or more primary colors by using a look-up table.

6. A display apparatus according to claim 5, wherein the look-up table is prepared by:

determining an area to which the received image signals of three primary colors belong, among a plurality of areas into which a three-dimensional space of the three primary colors is divided, and

converting the received image signals of three primary colors into color image signals of respective primary colors in the look-up table on the basis of a conversion parameter corresponding to positions of the received image signals of three primary colors in the determined area.