null  null
SR
358*69
xF-zr
4/8/80
mien-55c
I
United States Patent [191
[11]
4,197,559
Gramling
[45]
Apr. 8, 1980
[54] COLOR TELEVISION DISPLAY SYSTEM
[
76]
Inventor:
’
[211 App} No_ 950 677
[22] Filed:
References Cited
U.S. PATENT'DOCUMENTS
William D. Gramling, 5144 Newport
Ave" Chevy Chase’ Md- 20016
.
[56]
..
.
.
2,921,118
1/1960
Benjamin
3,086,076
4/1963
Harries ................................. .. 358/69
.....
. . . . ..
358/58
Priniary Examiner-Richard Murray
[57]
ABSTRACI‘
Means for projecting a color television picture by rotat
,
Oct- 12, 1978
ing or otherwise moving a multi-colored ?lter in front
[51]
Int. Cl.2 ............................................. .. H04N 9/12
[52] US. Cl. ...................................... .. 358/58; 358/67;
358/69
[58]
of a monochrome projection tube and detecting the
Color of the projected light to electronically switch the
appropriate color video input to the projection tube.
Field of Search ..................... .. 358/58, 6Q, 61, 62,
358/63, 67, 69
R B G
Video Input
4 Claims, 4 Drawing Figures
U.S. Patent
Apr. 8, 1980
Sheet 1 of 2
b\\\\\\\\\\\\\\
W
FIGURE l.
R B G
Video Input
FIGURE 2.
FIGURE 3.
4,197,559
US. Patent
Apr. 8, 1980
Sheet 2 of2
RB6
Video Input
Figure 4
4,197,559
4,197,559
1
,
COLOR TELEvIsIoN DISPLAY SYSTEM
activating "the sensors-7 andswitching theivideo switch
BACKGROUND OFT-HEINVENTIOM _ "
i The present "invention ‘relatesuto ‘the'?eld of color
2
portions of the ?lter disc-4 will be used, changing the
color of the light passing through and subsequently
‘ ‘to the‘ corresponding video inputto the projector tube
5
‘television projection systems.
' “ ‘In' FIG.’4, the‘?lter’disc'4, driven'by the~free-running
motor 10,‘ is placed in front of the'collimated light
DESCRIPTIONOF PRIOR‘ART -
source, 14. The photo sensors are placed in a position to
There is. agreat» need for a low-cost large-screen
samplethe color of light passing through the ?lter 'disc
television ,-_display system. However, it is very dif?cult
to achieve the necessary brightness with a single tri-'
4. The colored light then enters the mechanical scanner
13 which projects the light onto the screen 15 as a
color tube. The normally accepted method is to project
three tubes through red, blue and green ?lters, and
sensors instruct the video switcher 9 to'feed the correct
appropriate optics. This method is expensive and re
quires somewhat precise optics to achieve registration.
video signal to the light source 14. Mechanical scanners
are well known in the art and presently comprise ro
Another method is that of bombarding an oil ?lm with
a modulated electron beam to modulate light passing
through the ?lm. But this, too, is a very costly process
and not practical for home use.
tated mirrors and prisms.
scanned television picture. As in FIG. 1, the photo
The ?rst ?eld of video projected will now be com
posed of a mosaic of different colors, all correct in their
20
SUMMARY OF THE INVENTION
The primary object of the present invention is to
provide a practical, low-cost single tube color projec
tion system. A further object of the present invention is
to provide a low-cost, direct-view color television 25
viewing system.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring to the illustrations,
FIG. 1 shows the present invention utilizing Schmidt
optics. The associated power supplies and video detect
ing and processing ampli?ers are omitted for clarity.
FIG. 2 shows the preferred embodiment of the re
respective brightness components. On the next ?eld, the
?lter disc 4, revolved by the motor 10, has changed the
pattern of the disc in front of the projector tube face
plate. Each subsequent ?eld projects a different pattern,
with the three primary colors sequentially covering all
areas of the projected picture.
Flutter in a television picture originates with rythmic
light patterns. The present invention breaks up these
rythmic patterns by using a completely random ?lter
pattern and an unlocked drive motor to give a sequence
of randomly colored pictures.
The human eye will combine these sequential pic
tures into one true color picture with no ?utter or color
break-up of moving televised objects.
The, pattern of the ?lter disc should include blocks of
volved ?lter disc, and
FIG. 3 is the detail of a portion of the revolved ?lter 35 color no longer or wider than l0—l5 scan lines, and the
respective areas of the three primary colors should be
disc, showing the color con?guration.
equal. This design will eliminate the two de?ciencies of
FIG. 4 represents the present invention comprising a
focused video-modulated light source such as a laser or
a collimated incandescent light, projected through an
optical scanning device.
DESCRIPTION OF THE PREFERRE
sequential systems-?utter and edge break-up of mov
ing objects. The equal areas of red, blue and green will
give a true representation of color.
-
A secondary consideration for ?lter design is to place
an opaque strip between all color blocks to give a
sharper switching command from the photo sensors 7 to
the video selector switch 9. Another consideration
Referring to FIG. 1, the television projection tube 2 is
in close proximity to the revolved ?lter disc 4 and faces 45 would be to place transparent, uncolored areas in the
?lter disc to increase overall picture brightness. The
the mirror 6. The ?lter disc 4 is revolved by the motor
clear areas in the ?lter, however, would tend to reduce
10. Imbedded in the mirror 6, facing the projection tube
color saturation.
2, are three photo sensors 7, each detecting one of the
Although preferred embodiment of the ?lter would
primary colors, red, blue and green. The photo sensors
EMBODIMENTS '
7 are represented in the drawing as a single block for
be a disc, a drum or a vibrated resilient ?lter con?gura
clarity. The outputs of thephoto sensors 7 are directed
tion, any other ?lter design would be within the spirit of
to the video selector switch 9. The detected red,’ blue
the invention.
and green video portions of the projected television
ISince the color patterns are necessarily random, the
?lter disc motor 10 need not be synchronized. The
signal are also fed to the video selector switch 9.
The operation of the present invention is as follows: 55 video input to the projector tube 2 will be switched
The light is emitted from the television projection tube
correctly regardless of the position of the ?lter disc 4 or
2 and passes through the revolved ?lter disc 4 to the
the speed of the motor 10.
mirror 6. The light is then directed to the ‘spherical
mirror 11, through the correcting lens 12 and to the
screen.
Thus, the randomness of the color switching will
avoid the disadvantages of previous sequential systems,
edge break-up, ?utter, line-crawl and dot-crawl.
The photo sensors 7 and the video selector switch 9
The ?lter disc 4 colors the emerging projector light
must be very fast-acting, in the range of nanoseconds,
red, blue or green, depending on which portion of the
and essentially transient-free. Sensors and switchers of
?lter disc 4 the tube sees. This color is detected by one
of the photo sensors 7. The sensor instructs the video
this nature are presently available.
selector switch 9 to choose the appropriate color video 65 Although the preferred embodiment of the present
input to the projector tube 2, matching the video input
invention is a projector con?guration, a direct-view
to the color of the light. As the beam of light moves
television cathode ray tube can also be used, provided
across the faceplate of the projection tube 2, different
the photo sensors are placed in a position where they
4,197,559
3
?lter disc 4.
4
multi-colored ?lter placed in motion by a free-running,
can sample the color of the light emerging through the
random speed power source, said multi-colored ?lter in
g
The present invention can be used for industrial appli
cations where a very high brightness level is needed for
large screens. A mechanically scanned system can be
close frontal proximity to said light source, photo sen
used such as the modulated beam bombarding of an oil
signal into said modulated light source.
2. Means in accordance with claim 1 wherein said
light-emitting display device is a cathode ray tube.
sors sampling ?lter-colored light emerging from said
light source for purpose of switching appropriate video
?lm to modulate light passing through the oil ?lm,
where the photo sensors 7 and the video switcher 9
would supply the correct video to the beam, or, in the
case of a laser light source, to modulate the light source 10
itself.
What I claim is:
3. Means in accordance with claim 1 wherein said
light-emitting display device is a mechanical scanner.
7 4. Means in accordance with claim 1 wherein said
light is emerging from a television cathode ray tube.
1. A color television viewing system comprising: A
i
light source modulated by a color television signal, a
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