Computer graphics processing and selective visual display system – Image superposition by optical means
Reexamination Certificate
2000-05-30
2003-08-05
Chang, Kent (Department: 2673)
Computer graphics processing and selective visual display system
Image superposition by optical means
C359S462000, C349S077000, C348S055000, C348S056000
Reexamination Certificate
active
06603442
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a stereoscopic image display device, and more particularly to a stereoscopic image display device that is adaptive for displaying a stereoscopic image without a deterioration of resolution.
2. Description of the Related Art
Generally, a stereoscopic image display device takes advantage of the perspective represented when different image signals recognized by two eye of an observer are combined to display an image stereoscopically. Such a stereoscopic image display device is largely classified into an auto-stereoscopic system and a binocular system. The former permits an appreciation of stereoscopic image with no auxiliary equipment, whereas the latter requires auxiliary equipment such as a polarization glass for the purpose of appreciating a stereoscopic image. Accordingly, nowadays, there have actively conducted a study and development of the stereoscopic image display device of auto-stereoscopic system.
FIG. 1
shows a stereoscopic image display device disclosed in Korean Patent Application No. 98-55228 filed on Dec. 16, 1998 by LG Electronics Inc. The stereoscopic image display device includes first and second cameras
2
a
and
2
b
for photographing an object at a different angle, an image signal converter
4
for converting an image signal applied from the first and second cameras
2
a
and
2
b
into a specific shape, a display
6
for displaying a picture corresponding to the converted image signal, and a color barrier
8
arranged between the display,
6
and an observer to choose color signals. An image signal photographed with the first camera
2
a
includes red(r
1
), green(g
1
) and blue(b
1
) color signals while an image signal photographed with the second camera
2
b
includes red(r
2
), green(g
2
) and blue(b
2
) different from the image signal photographed with the first camera
2
a
. In the display
6
, a first picture element (or pixel) P
1
displayed by r
1
, g
2
and b
2
color signals and a second picture element P
2
displayed by r
2
, g
1
and b
1
color signals are alternately arranged. In the color barrier
8
, a red filter
8
R and a cyan filter
8
C that have the color selectivity of complementary color relationship, are alternately arranged. The red filter
8
R transmits only a red light while the cyan filter
8
C transmits a green or blue light. When an observer views an image signal via the color barrier
8
, an image signal having r
1
, g
1
and b
1
color signals is incident to the left eye of an observer while an image signal having r
2
, g
2
and b
2
color signals is incident to the right eye of an observer. Accordingly, an object photographed with the first camera
2
a
emerges at the left eye of an observer, whereas an object photographed with the second camera
2
b
emerges at the right eye of an observer. Since image signals at a different angle are viewed by the left and right eyes of an observer and then combined in the above manner, an observer can view a stereoscopic image.
Such a stereoscopic image display device divides the displayed image signal into two signals to display a two-view three-dimension (3D) image. The stereoscopic image display device as shown in
FIG. 1
, however, has a disadvantage in that its resolution is deteriorated in inverse proportion to the number of views. In the case of the two-view 3D image as shown in
FIG. 1
, the resolution is reduced to ½ because two cells of the red filter
8
R and the cyan filter
8
C is required to display a single of image signal. In other words, if the stereoscopic image display device as shown in
FIG. 1
is to display an n-view 3D stereoscopic image, then its resolution is reduced to 1
.
Alternatively, a stereoscopic image may be perceived without a deterioration of resolution by taking advantage of a blinking-type light source. Referring to
FIG. 2
, a two-view 3D stereoscopic display device employing such a blinking-type light source includes a blinking light source
12
, and a display
14
on which an image is displayed. In the blinking light source
12
, a first light source L
1
and a second light source L
2
are alternately arranged. The first and second light sources L
1
and L
2
are opposed to pixel cells of the display
14
. These first and second light sources L
1
and L
2
are alternately turned on and off to emit a light to the pixel cells of the display
14
. In a t
1
interval, the first light source L
1
is turned on while the second light source L
2
is turned off. At this time, an observer views a picture as shown in FIG.
3
A. Specifically, if the first light source only is turned on, then the left eye of an observer can perceive only a first pixel cell
14
a
, and the light eye of an observer can perceive only a second pixel cell
14
b
. Subsequently in a t
2
interval, the first light source L
1
is turned off while the second light source L
2
is turned on. Then, an observer can view only the second pixel cell
14
b
with his left eye and only the first pixel cell
14
a
with his right eye as shown in FIG.
3
B. As described above, the stereoscopic image display device employing the blinking light source changes an image signal with the lapse of time, so that it can display a stereoscopic image without a deterioration of resolution. In other words, in the case of a two-view 3D stereoscopic image, the stereoscopic image display device displays two image signals via two pixel cells in the t
1
and t
2
intervals to prevent a deterioration of resolution.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a, stereoscopic image display apparatus that is capable of displaying a stereoscopic image without a deterioration of resolution.
In order to achieve these and other objects of the invention, a stereoscopic image display apparatus according to an embodiment of the present invention includes display means for displaying an image; and color converting means for differentiating a wavelength range of a light transmitted at a desired time interval with respect to a certain pixel area in the display means.
A stereoscopic image display apparatus according to another embodiment of the present invention includes display means for displaying an image; and color converting means, having a light transmitting area and a light shutting-off area for each pixel cell of the display means, for alternating the light transmitting area and the light shutting-off area at a desired time interval with respect to a certain pixel area of the display means.
A stereoscopic image display apparatus according to still another embodiment of the present invention includes display means for displaying an image; color signal generating means for generating a different wavelength of lights for each pixel cell of the display means; and optical shutter means, having a light transmitting area and a light shutting-off area for each pixel cell of the display means, for differentiating the light transmitting area and the light shutting-off area at a desired time interval with respect to a certain pixel area of the display means.
A stereoscopic image display apparatus according to still another embodiment of the present invention includes display means for displaying an image; color converting means for differentiating a wavelength range of lights at a desired time interval with respect to a certain pixel area of the display means; and light shutter means having a light transmitting area and a light shutting-off area for each pixel cell of the display means.
REFERENCES:
patent: 4829365 (1989-05-01), Eichenlaub
patent: 5036385 (1991-07-01), Eichenlaub
patent: 5886675 (1999-03-01), Aye et al.
patent: 6040807 (2000-03-01), Hamagishi et al.
patent: 2002/0030888 (2002-03-01), Kleinberger et al.
Chang Kent
LG. Philips LCD Co. Ltd.
McKenna Long & Aldridge LLP
Sheng Tom V.
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