Television – Stereoscopic – Stereoscopic display device
Reexamination Certificate
1998-09-16
2004-09-14
Philippe, Gims (Department: 2613)
Television
Stereoscopic
Stereoscopic display device
C348S057000, C359S464000
Reexamination Certificate
active
06791599
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
It is well known that a 3D (three-dimensional) image display system causes the viewer to view a stereoscopic view by displaying a right eye image and a left eye image alternately on a screen of a 3D display in a predetermined period and comprising liquid crystal shutter glasses, mounted by a viewer, in which a right eye liquid crystal and a left eye liquid crystal alternately transmit light and do not transmit light, respectively, in synchronization with the predetermined period. The present invention relates to a driving apparatus for driving the liquid crystal shutter glasses. The present invention further relates to a spatial transmission signal transmitting apparatus for transmitting a spatial transmission signal fed to the liquid crystal shutter glasses.
2. Description of the Prior Art
In order to inform liquid crystal shutter glasses of switching between a right eye image (R) and a left eye image (L) on the side of a 3D display , there is a technique using an infrared signal. As the specific construction, construction shown in
FIG. 16
has been considered. In the construction, a clock having a frequency of 455 to 500 KHz is changed into a clock having a frequency of approximately 30 to 57 KHz by a divider
501
, and the clock having a frequency of 30 to 57 KHz is used as a carrier. A gate signal generating circuit
502
receives the clock which is the carrier, and detects an edge of a signal representing switching between a left eye image and a right eye image which are alternately displayed on a screen (hereinafter referred to as an L/R polarity switching signal) by the clock, to generate a signal representing distinction between a right eye image and a left eye image (hereinafter referred to as a gate signal) on the basis of the edge. An AND element
503
carries out the conjunction between the clock which is the carrier and the gate signal, to generate an LED driving pulse. The LED driving pulse is fed to an LED light emitting unit (not shown), so that the LED light emitting unit emits light (blinks) depending on the driving pulse.
In the above-mentioned construction, however, a difference (jitter t) between the edge of the L/R polarity switching signal and a rise edge of the gate signal is a maximum of one pulse of clock having a frequency of 30 to 57 KHz (approximately 20 &mgr;s) which is the carrier. The jitter is relatively large. When a signal having the jitter is reproduced (decoded) on the side of the liquid crystal shutter glasses, jitter based on a clock on the side of the liquid crystal shutter glasses is further added. Consequently, the width of the total jitter becomes larger, so that various problems arise. For example, a shutter switching portion flickers.
In cases such as that a person passes between the 3D display and the viewer, the infrared signal may, in some cases, be blocked for several seconds. In such a case, the liquid crystal shutter glasses stop operating in a state where they transmit the right eye image (R) or a state where they transmit the left eye image (L), resulting in a state where 3D view is impossible. The conventional liquid crystal shutter glasses cannot cope with plurality of frequencies. For example, they cope with, if the timing of switching (field frequency) between the right eye image (R) and the left eye image (L) is 120 Hz, only the frequency of 120 Hz, and they cope with, if it is 60 Hz, only the frequency of 60 Hz. That is, they cannot cope with various types of 3D displays that differ in field frequency.
In the liquid crystal shutter glasses, a liquid crystal which does not transmit light when a predetermined minus voltage and a predetermined plus voltage are applied thereto, while transmitting light when a voltage of zero volt is applied has been conventionally used. Since the response speed thereof in a case where the liquid crystal is changed from a state where it does not transmit light to a state where it transmits light upon application of a voltage of zero volt is low, however, the liquid crystal does not sufficiently transmit light even after a vertical blanking period, as shown in
FIG. 18
, so that the upper part of a screen looks dark.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above-mentioned circumstances and has for its object to provide an apparatus for driving liquid crystal shutter glasses capable of maintaining a shutter operation even if a signal representing shutter timing in the liquid crystal shutter glasses is blocked, to cope with various types of 3D displays which differ in field frequency, and to prevent the upper part of a screen from looking dark.
An apparatus for driving liquid crystal shutter glasses according to the present invention is characterized by comprising receiving means for receiving a spatial transmission signal generated on the basis of a signal representing switching between right and left eye images, means for acquiring data relating to shutter timing in the liquid crystal shutter glasses from the received spatial transmission signal, and means for causing the liquid crystal shutter glasses to perform a shutter operation using the acquired data relating to shutter timing.
According to the above-mentioned construction, the spatial transmission signal is generated on the basis of the signal representing switching between right and left eye. images, and the data relating to shutter timing in the liquid crystal shutter glasses is acquired from the spatial transmission signal on the side of the liquid crystal shutter glasses, to cause the liquid crystal shutter glasses to perform the shutter operation. That is, if a frequency for switching between right and left eye images changes, the spatial transmission signal changes depending on the change, so that the change can be detected on the side of the liquid crystal shutter glasses. Accordingly, the liquid crystal shutter glasses can cope with various types of 3D displays that differ in field frequency.
An apparatus for driving liquid crystal shutter glasses according to the present invention is characterized by comprising receiving means for receiving a spatial transmission signal generated on the basis of a signal representing switching between right and left eye images, means for acquiring data relating to shutter timing in the liquid crystal shutter glasses from the received spatial transmission signal, means for holding the acquired data relating to shutter timing, and means capable of causing the liquid crystal shutter glasses to perform a shutter operation using the held data relating to shutter timing under predetermined conditions.
According to the above-mentioned construction, the spatial transmission signal is blocked, so that the shutter operation in the liquid crystal shutter glasses can be continued (self-contained) even if the data relating to shutter timing in the liquid crystal shutter glasses cannot be generated, thereby making it possible to prevent a screen from flickering when the signal is blocked.
An apparatus for driving liquid crystal shutter glasses according to the present invention is characterized by comprising receiving means for receiving a spatial transmission signal generated on the basis of a signal representing switching between right and left eye images, means for acquiring data relating to shutter timing in the liquid crystal shutter glasses from the received spatial transmission signal, means for generating decision data relating to shutter timing to be fed to the liquid crystal shutter glasses on the basis of predetermined conditions from the data relating to shutter timing newly obtained in succession and holding the generated decision data, and means capable of causing, when no decision data is generated because the predetermined conditions are not satisfied, the liquid crystal shutter glasses to perform a shutter operation using the held decision data.
In the above-mentioned construction, the apparatus for driving liquid crystal shutter glasses may be so constructed that predetermined processing is execute
Mori Yukio
Murata Haruhiko
Okada Seiji
ArentFox PLLC
Philippe Gims
Vo Tung
LandOfFree
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