Liquid crystal cells – elements and systems – Liquid crystal system – Stereoscopic
Reexamination Certificate
1998-09-23
2001-07-24
Parker, Kenneth (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal system
Stereoscopic
C349S013000, C359S466000, C345S032000
Reexamination Certificate
active
06266106
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to liquid crystal shutter glasses.
2. Description of Prior Art
A three-dimensional image display system by which a viewer with liquid crystal shutter glasses can view stereoscopic image is well-known. The three-dimensional image display system alternately displays images for a right eye and images for a left eye on a screen in a determined period. (The term “3D display” in this specification indicates the above type of display.) As regarding liquid crystal shutter glasses on which a viewer puts, liquid crystal for a right eye and liquid crystal for a left eye alternately transmit light and do not transmit light respectively in synchronization with the determined period.
FIG. 10A
is a plan view showing the conventional liquid crystal shutter glasses.
FIG. 10B
is a perspective view showing the conventional liquid crystal shutter glasses, as seen from the front side. These figures show that liquid crystal for a right eye and a left eye of the conventional liquid crystal shutter glasses are positioned in one plane. In other words, when the viewer puts on the liquid crystal shutter glasses, both liquid crystal for a right eye
51
R and liquid crystal for a left eye
51
L become parallel to a screen of 3D display (not shown).
As regard to display which use liquid crystal particularly, the dependence on the visual angle has become a problem. That is, color and brightness of a screen change depending on an angle at which the viewer watches the screen and the direction in which the viewer watches the screen. This dependence on the visual angle is explained in
FIGS. 11A and 11B
.
FIG. 11A
is a sectional model view of liquid crystal pixel, and
FIG. 11B
is a graph showing the change of transmittivity (T) to the change of the voltage (V) when the transmittivity at a voltage of 0V is 100%. Characteristic A, characteristic of the front, and characteristic B in
FIG. 11B
respectively correspond to direction A, direction of the front, direction B in FIG.
11
A. Liquid crystal has the dependence on the visual angle, so that, generally speaking, a screen may look white or black when viewed from the upper or lower direction.
Liquid crystal shutter glasses of
FIGS. 10A and 10B
composed of liquid crystal which have the dependence on the visual angle make it impossible to obtain the highest contrast to the screen direction of the 3D display. Insufficient contrast causes the following inconveniences. When liquid crystal for a right eye
51
R transmits light and liquid crystal for a left eye
51
L does not transmit light, the image for a right eye transmits the liquid crystal for a left eye
51
L that should not transmit light and the images streams through the left eye of the viewer. When liquid crystal for a left eye
51
L transmits light and liquid crystal for a right eye
51
R does not transmit light, the image for a left eye transmits the liquid crystal for a right eye
51
R that should not transmit light and the images streams through the right eye of the viewer. Occurrence of crosstalk obstructs adequate stereoscopic view.
As shown in
FIGS. 10A and 10B
, the common eyeglasses type of liquid crystal shutter glasses that the viewer's nose and ears hold liquid crystal shutter glasses portion and the goggle type of liquid crystal shutter glasses that rubber band or the like press down liquid crystal shutter glasses portion to the viewer's face are well-known as the conventional type of liquid crystal shutter glasses. Such liquid crystal shutter glasses as common eyeglasses type and goggle type, however, are awkward to use for those who put on eyeglasses.
SUMMARY OF THE INVENTION
The present invention has been made in consideration of the above circumstances and has an object to provide liquid crystal shutter glasses by which the high contrast to a screen direction of 3D display, that is, to the front direction, can be obtained when a viewer with liquid crystal shutter glasses views the screen of 3D display which is positioned in front of the viewer. Another object of the present invention is to provide the liquid crystal shutter glasses which is easy to handle for those who put on eyeglasses.
Liquid crystal shutter glasses of the present invention, wherein liquid crystal for a right eye and liquid crystal for a left eye alternately transmit light and do not transmit light respectively in a determined period to enable the viewer to view stereoscopic image, is characterized by that liquid crystal for a right eye and liquid crystal for a left eye are inclined so that the directions to obtain the high contrast of said liquid crystal for right and left eyes face on the approximate front of the screen.
In the above construction, the high contrast to the direction of the screen that displays stereoscopic image can be obtained and the disappearance of cross-talk realizes adequate stereoscopic view.
Liquid crystal shutter glasses of the present invention, wherein liquid crystal for a right eye and liquid crystal for a left eye alternately transmit light and do not transmit light respectively in said determined period to enable the viewer to view stereoscopic image, is also characterized by that preferential directions of visual view of liquid crystal for right and left eyes are set horizontally (in horizontal plane) and liquid crystal for a right eye and a left eye are inclined in correspondent to the preferential direction of visual view so that the directions to obtain the high contrast of said liquid crystal for right and left eyes face on the approximate front of the screen.
Liquid crystal shutter glasses of the present invention, wherein liquid crystal for a right eye and liquid crystal for a left eye alternately transmit light and do not transmit light respectively in said determined period to enable the viewer to view stereoscopic image, is also characterized by that the preferential directions of visual view of liquid crystal for right and left eyes are set vertically (in vertical plane) and liquid crystal for a right eye and a left eye are inclined in correspondent to the preferential direction of visual view so that the directions to obtain the high contrast of said liquid crystal for right and left eyes face on the approximate front of the screen.
Liquid crystal shutter glasses of this invention comprises a band portion which is put over from around the viewer's forehead to the upper-side of his ears, a connecting portion overhanging from around said forehead of said band portion, liquid crystal shutter glasses portion mounted on said connecting portion so as to face to the front of the viewer's eyes, and slip restraint means to restrain said band portion from slipping down the viewer's head.
In the above construction, liquid crystal shutter glasses portion is provided so as to overhang from around said forehead of the band portion and face to the front of the viewer's eyes. Therefore, users with eyeglasses can put on the liquid crystal shutter glasses without any inconvenience. Further, the slip restraint means to restrain said band from slipping down the viewer's head can have a sufficient capability to retain the liquid crystal shutter glasses.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4698668 (1987-10-01), Milgram
patent: 4982278 (1991-01-01), Dahl et al.
patent: 5281957 (1994-01-01), Schoolman
patent: 5463428 (1995-10-01), Lipton et al.
patent: 5506705 (1996-04-01), Yamamoto et al.
Miwa Takashi
Mori Yukio
Murata Haruhiko
Oyamada Kenji
Arent Fox KinterPlotkin & Kahn, PLLC
Parker Kenneth
Qi Mike
Sanyo Electric Co,. Ltd.
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