U.S. patent application number 11/270441 was filed with the patent office on 2006-06-22 for projection system or lighting device.
Invention is credited to Chris Colpaert.
Application Number | 20060132722 11/270441 |
Document ID | / |
Family ID | 35428047 |
Filed Date | 2006-06-22 |
United States Patent
Application |
20060132722 |
Kind Code |
A1 |
Colpaert; Chris |
June 22, 2006 |
Projection system or lighting device
Abstract
Projection system or lighting device which is provided of a
color sequential device as for example a color wheel (6), a
rotating prism or other, wherein the color sequential device
consists of a combination of at least one of the primary colors
Red, Green and Blue with at least one of the secondary colors Cyan,
Magenta and Yellow.
Inventors: |
Colpaert; Chris;
(Lovendegem, BE) |
Correspondence
Address: |
BACON & THOMAS, PLLC
625 SLATERS LANE
FOURTH FLOOR
ALEXANDRIA
VA
22314
US
|
Family ID: |
35428047 |
Appl. No.: |
11/270441 |
Filed: |
November 10, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60636859 |
Dec 20, 2004 |
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Current U.S.
Class: |
353/84 |
Current CPC
Class: |
H04N 9/3114 20130101;
G03B 21/2026 20130101; G03B 21/2053 20130101; H04N 9/312 20130101;
G03B 21/14 20130101; G02B 26/008 20130101; G03B 33/08 20130101;
G03B 27/547 20130101; H04N 9/3123 20130101 |
Class at
Publication: |
353/084 |
International
Class: |
G03B 21/14 20060101
G03B021/14 |
Claims
1. A projection system or lighting device including a color
sequential device, said color sequential device comprising a
combination at least one of the primary colors Red, Green and Blue
with at least one of the secondary colors Cyan, Magenta and
Yellow.
2. The projection system for lighting device according to claim 1,
wherein the color sequential device comprises a combination of all
the primary colors Red, Green and Blue with at least one of the
secondary colors Cyan, Magenta and Yellow.
3. The projection system or lighting device according to claim 1,
wherein the color sequential device comprises a combination of at
least one of the primary colors Red, Green and Blue with all the
secondary colors Cyan, Magenta and Yellow.
4. The projection system or lighting device according to claim 1,
wherein the color sequential device comprises all the primary
colors and all the secondary colors.
5. The projection system or lighting device according to claim 1,
wherein the color sequential device contains also White.
6. The projection system or lighting device according to claim 1,
wherein the color sequential device comprises a plurality of color
wheels.
7. The projection system or lighting device according to claim 6,
wherein the color wheels are positioned one after the other.
8. A color sequential device for use in a projection system or
lighting device according to claim 1.
9. The color sequential device according to claim 8, wherein the
color sequential device is a color wheel or a combination of color
wheels.
10. The color sequential device according to claim 8, wherein the
color sequential device is a rotating prism.
11. The color sequencing device according to claim 1, wherein the
color sequencing device is a color wheel.
Description
BACKGROUND OF THE INVENTION
[0001] At present, color sequential projection systems make use of
a color sequential device as for example a color wheel, a rotating
prism or other, which produces sequential Red, Green and Blue
images in the case of RGB color wheels.
[0002] Sometimes, a white segment is included to increase the lumen
output, i.e. RGBW color wheels.
[0003] This way of creating colored images has its origin in the
video industry. In the lighting industry however, instead of using
the primary colors Red, Green and Blue, the secondary colors are
used: Cyan, Magenta and Yellow.
[0004] The problem of using such conventional projection or
lighting device, be it with an RGB-color wheel or a CMY-color wheel
or with any other conventional color sequential device, is that the
color gamut is rather limited and far more reduced than the
theoretical color gamut that can be obtained by combining the
primary colors Red, Green and Blue.
[0005] As a consequence thereof, the conventional projection
systems cannot be used in both market applications. Video
applications require RGB-color wheels. Lighting applications
require the use of CMY-color wheels.
SUMMARY OF THE INVENTION
[0006] In view of the above limitations, the invention concerns a
projection system or lighting device which is provided of a color
sequential device as for example a color wheel, a rotating prism or
other, wherein the color sequential device consists of a
combination of at least one of the primary colors Red, Green and
Blue with at least one of the secondary colors Cyan, Magenta and
Yellow.
[0007] The color sequential device can for example consist of a
color-wheel that consists of a combination of all the primary
colors: Red, Green and Blue; all the secondary colors: Magenta,
Cyan, Yellow; and optionally also White.
[0008] Such a color wheel widens the color gamut of the projection
system or lighting device according to the invention as compared to
the color gamut of a conventional projection system using RGB-color
wheels, and as compared with a conventional lighting device making
use of a CMY-color wheel.
[0009] The new gamut is even wider than the simple unification of
the gamut of a conventional RGB-wheel and of the gamut of a
conventional CMY-wheel.
[0010] Indeed, by combining one or more of the primary colors with
one or more of the secondary colors, so called new colors can be
obtained that could not be created by combining the primary colors,
neither by combining the secondary colors.
[0011] A major advantage is that such a projection system or
lighting device according to the invention can be used in both
video applications and in lighting applications.
[0012] According to a special embodiment, the color sequential
device consists of two color wheels, for example positioned one
after the other, wherein the first color wheel consists of the
primary colors and White, and wherein the second color wheel
consists of the secondary colors and White.
[0013] Such projection system or lighting device can be used in
pure video applications, more in particular by using the RGBW color
wheel and by holding the CMYW-color wheel on White.
[0014] In the case of typical lighting applications, the RGBW-color
wheel can be held on the White segment, and the CMYW-color wheel
can be activated for sequentially showing the CMYW-segment.
[0015] If in special cases the purity of the primary and secondary
colors is important, the device can switch between both color
wheels.
[0016] The invention also concerns a color sequential device as for
example a color wheel, a rotating prism or other, that can be
applied in a projection system or lighting device according to the
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to better explain the characteristics of the
invention, the following preferred embodiment is described as an
example only, without being limitative in any way, with reference
to the accompanying drawings, in which:
[0018] FIG. 1 represents a schematic view of a color wheel
consisting of a combination of the primary colors;
[0019] FIG. 2 is a schematic view of a color wheel consisting of a
combination of the secondary colors;
[0020] FIG. 3 represents a conventional color diagram;
[0021] FIG. 4 is a schematic view of a color wheel consisting of a
combination of all the primary colors and all the secondary
colors.
[0022] FIG. 1 represents a conventional primary color wheel 1
consisting of three equal segments R, B and G, which represent
respectively the primary colors Red, Green and Blue.
[0023] Such conventional RGB-color wheel is usually provided in
traditional video projection systems.
[0024] FIG. 2 represents a conventional secondary color wheel 2
consisting of three equal segments, in this case C, M and Y, which
represent respectively the secondary colors Cyan, Magenta and
Yellow.
[0025] The known CMY-color wheels are often provided in lighting
devices.
[0026] FIG. 3 represents a diagram wherein the theoretical gamut is
outlined by the widest curve in bold.
[0027] When a conventional RGB-color wheel 1 is used, a reduced
gamut is obtained, represented by a primary triangle 3 from which
the corners are indicated as R, G and B, representing the Red,
Green and Blue obtained by a conventional RGB color wheel 1.
[0028] All combinations of the three primary colors result in
colors which can be represented by a point within said primary
triangle 3.
[0029] In a similar way, when a conventional CMY-color wheel 2 is
used, another reduced gamut is obtained represented by a secondary
triangle 4 from which the corners are indicated as C, M and Y,
representing the Cyan, Magenta and Green obtained by a conventional
CMY-color wheel 2.
[0030] All combinations of the three secondary colors result in
colors which can be represented by a point within said secondary
triangle 4.
[0031] By combining for example all primary colors and all
secondary colors, any color can be obtained which can be
represented by a point within a hexagon 5 as defined by the six
corners R, G, B, C, M and Y.
[0032] According to the invention and as shown in FIG. 4, a
projection system or lighting device can be provided of a color
wheel 6 consisting of in this case six equal segments of R, B, G,
C, M and Y, which represent respectively the primary colors Red,
Green and Blue, and respectively the secondary colors Cyan, Magenta
and Yellow.
[0033] Referring to the diagram as shown in FIG. 3, this color
wheel can create all combinations of said six colors. Each
combination can be represented by a point within the hexagon 5
defined by said six colors.
[0034] The color gamut of the projection system or lighting device
according to the invention provided of such a color wheel is wider
than the color gamut of a conventional projection system using
RGB-color wheels or using CMY-color wheels.
[0035] The new gamut is even wider than the simple superposition of
the gamut of a conventional RGB-wheel and of the gamut of a
conventional CMY-wheel. Indeed, the surface of the hexagonal 5 is
wider than the surface of the superposed primary triangle 3 with
the secondary triangle 4.
[0036] It should be clear that a projection system or lighting
device according to the invention can also be provided of a color
sequential device of another type, for example a rotating prism,
and that the color sequential device may consist of a combination
of at least one color chosen from the primary colors, and one color
chosen from the secondary colors, and that it may optionally also
contain White.
[0037] White is often added to increase the lumen output.
[0038] In the case of color wheels, not all segments need to be
equal in dimension and the colors do not need to be applied in
segments.
[0039] It is clear that the color sequential device can also
consist of two or more color wheels, for example positioned one
after the other, wherein the first color wheel can consist of the
primary colors and White, and wherein the second color wheel can
consist of the secondary colors and White.
[0040] Such projection system or lighting device can be used in
pure video applications, more in particular by using the RGBW color
wheel and by holding the CMYW color wheel on White.
[0041] In the case of typical lighting applications, the RGBW color
wheel can be held on the White segment, and the CMYW color wheel
can be activated for sequentially showing the CMYW segment.
[0042] If in special cases the purity of the primary and secondary
colors is important, the device can switch between both color
wheels.
[0043] It is clear that the two or more color wheels can also be
used simultaneously, and the colors of the wheel closest to the
light source can be activated by holding the further wheel or
wheels on White.
[0044] The present invention is by no means limited to the
above-described embodiment represented in the accompanying
drawings; on the contrary, such a projection system or lighting
device can be made in all sorts of shapes and dimensions while
still remaining within the scope of the invention.
* * * * *