JP3397935B2 - 3D image device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic display having a liquid crystal shutter for displaying left and right video signals alternately on a field-by-field basis on a cathode ray tube (hereinafter abbreviated as CRT) and alternately opening and closing corresponding to the left and right video. The present invention relates to a video device.

[0002]

2. Description of the Related Art There has been proposed a stereoscopic image device having a liquid crystal shutter which alternately outputs left and right images for each field, displays the images on a CRT as images, and alternately opens and closes corresponding to the left and right images.

In this apparatus, left and right images are alternately output at a certain field frequency. Further, the left liquid crystal shutter is opened when displaying the image for the left eye and closed when displaying the image for the right eye. The right liquid crystal shutter moves in the opposite direction.

Therefore, if the left liquid crystal shutter is placed in front of the left eye and the right liquid crystal shutter is placed in front of the right eye, the image for the left eye is recognized only by the left eye, and the image for the right eye is only seen by the right eye. Be recognized. That is, if the left and right images are displayed with parallax between both eyes, they are perceived as a stereoscopic effect.

[0005]

In these conventional stereoscopic image devices, in order to prevent the image disturbance and the audio disturbance (noise) at the time of channel switching, the image is blocked for a certain period after channel switching. We are implementing rankings and muting audio.

However, even when the channel is switched, the shutter switching signal to the spectacles is always output. Therefore, when the channel is switched, the left eye video signal and the right eye video signal displayed on the CRT are switched. The timing and the switching timing of the liquid crystal shutter are not synchronized with each other, and therefore the viewer has a hard-to-see image when switching channels.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to obtain a stereoscopic display device which can block unsightly images at the time of channel switching with a simple structure and allow an observer to recognize an optimal image. To aim.

[0008]

SUMMARY OF THE INVENTION The present invention provides a display means for alternately displaying a left-eye image and a right-eye image for displaying a stereoscopic image, and a right eye and a left eye of an observer of the image. The control signal transmission means is configured to transmit the control signal for controlling the interruption of the interruption means in synchronization with the display, and the control signal transmission means for switching the channel. The stereoscopic image device is characterized in that transmission of the control signal to the cutoff control means is stopped for a certain period of time.

Further, according to the present invention, a tuner means for converting an input signal into an intermediate frequency signal, a channel selecting means for outputting a channel selection signal according to a channel selection, and an intermediate frequency signal from the tuner means are used. A video processing means for taking out the video signal and demodulating the video signal; and a stereoscopic video signal in which a right eye video signal and a left eye video signal are alternately generated based on the intermediate frequency video signal from the video processing means, From the stereoscopic video creating means, a stereoscopic video creating means for creating a shutter switching signal, a display means for selectively displaying the demodulated video signal from the video processing means or the stereoscopic video signal from the stereoscopic video creating means. Shutter means for alternately blocking the visual fields of the right eye and the left eye of the observer in response to the display of the stereoscopic image signal, and the shutter from the stereoscopic image display means. And a shutter switching signal transmitting means for transmitting the shutter switching signal to the shutter means. Stopping the display of the video signal or the stereoscopic video signal by the display means for a certain period according to the channel selection signal, and stopping the transmission of the shutter switching signal from the shutter switching signal transmission means to the shutter means. It is a featured stereoscopic image device.

[0010]

The input video signal is converted into the intermediate frequency video signal by the tuner 1 and then input to the video intermediate frequency amplifier circuit 4 to be amplified. This intermediate frequency video signal is
The signal is detected by the video detection circuit 5 and displayed on the CRT 8 via the video amplification circuit 6.

On the other hand, when displaying a stereoscopic video, the video signal detected by the video detection circuit 5 is the stereoscopic video circuit 13.
At, the left-eye video signal and the right-eye video signal are converted into a stereoscopic video signal that is alternately switched for each field, and this stereoscopic video signal is displayed on the CRT via the video amplifier circuit 6.

At this time, a shutter switching synchronization signal is sent from the stereoscopic video circuit 13 to the shutter switching signal transmission circuit 1.
4 is output. The shutter switching signal transmission circuit 14 outputs a shutter switching signal to the glasses, and the shutter switching signal switches the liquid crystal shutter of the glasses in synchronization with the switching between the left-eye video signal and the right-eye video signal.

When the channel is switched, a mute signal is output from the tuning circuit 3 to the video amplifier circuit 6,
Video is blanked for a certain period,
This mute signal is sent to the shutter switching signal transmission circuit 14
Also, the transmission of the shutter control signal is stopped for a certain period.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A stereoscopic image device of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a stereoscopic image device of the present invention.

In FIG. 1, the stereoscopic image device includes a tuner 1 for converting an input signal into an intermediate frequency signal, and an image intermediate frequency amplifier circuit 4 for extracting and amplifying an image signal from the intermediate frequency signal from the tuner 1. A video detection circuit 5 that detects this video signal, a video amplification circuit 6 that extracts a sync signal from the detected video signal, amplifies and demodulates the video signal from which the sync signal has been extracted, and a sawtooth wave based on the sync signal. It has a deflection circuit 7 for producing a current and flowing it to a deflection coil (not shown), and a CRT 8 for receiving the output of the demodulation output from the image amplification circuit 6 and displaying the image.

The stereoscopic image device further includes an audio intermediate frequency amplifier circuit 9 for amplifying an audio signal and an audio intermediate frequency amplifier circuit 9
FM detection circuit 10 for detecting the audio signal amplified by
And a speaker 12 for reproducing the audio signal output from the audio amplifier circuit 11, and an audio amplifier circuit 11 for amplifying and demodulating the detected audio signal.

Further, the stereoscopic image device is composed of a microcomputer, and a remote control receiving circuit 2 for demodulating an infrared signal from a remote control (not shown), and a channel selection signal based on the demodulated output from the remote control receiving circuit 2. And a tuning circuit 3 for outputting various command signals such as a volume control signal.

Further, the stereoscopic video device takes out the video signal from the video detection circuit 5, creates a stereoscopic video in which the video signal for the left eye and the video signal for the right eye are alternately switched for each field, and the liquid crystal shutter of the glasses is used. It has a stereoscopic video circuit 13 for creating a shutter switching signal for switching between the two, and a shutter switching signal transmitting circuit 14 for converting the shutter switching signal created by the stereoscopic video circuit 13 into a remote control signal.

FIG. 2 is a detailed diagram of the shutter switching signal transmission circuit 14 in FIG. 1, and FIG. 3 is a block diagram of liquid crystal shutter glasses for viewing a stereoscopic image.

In FIG. 2, the shutter switching signal transmission circuit 14 has a microcomputer having a system control section 14b which receives a shutter switching synchronization signal and a mute signal and a modulation circuit 14c which receives an output signal from the system control section 14b. Hereinafter, the microcomputer is abbreviated) 14a, an infrared LED drive circuit 14d connected to the microcomputer 14a, and an infrared LED 14e connected to the infrared LED drive circuit d.

Here, the system control unit 14b has a shutter switching L / R determination register that stores a left-eye signal or a right-eye signal, and this register is left at the initial start (when the power is turned on). The eye (L) is set.

The right eye (R) may be initially set in this register.

Further, the output terminal 14f is an output terminal of a shutter switching remote control signal for controlling the liquid crystal shutter glasses by wire.

In FIG. 3, the liquid crystal shutter glasses include a light receiving diode 17 for converting a remote control signal transmitted by infrared rays from the shutter switching signal transmission circuit 14 into an electric signal.
And a receiving circuit 19 having an integrating circuit and a waveform shaping circuit for amplifying the electric signal and removing the carrier wave
An oscillator circuit 20 for generating a reference clock for the system control unit 21; a system control unit 21 for generating a liquid crystal shutter switching signal by inputting a remote control signal from the receiving circuit 19 and the reference clock from the oscillator circuit 20; A liquid crystal drive circuit 23 connected to the control unit 21, a liquid crystal shutter 24 controlled by a signal from the liquid crystal drive circuit 23, a power supply 25 having a lithium battery or the like, and switching between operation / non-operation of the liquid crystal shutter glasses. And a switch 22.

The input terminal 18 is an input terminal for a shutter switching remote control signal for controlling the liquid crystal shutter glasses by wire.

The liquid crystal shutter 24 is composed of a right eye shutter and a left eye shutter.

Next, the general operation of the stereoscopic image device of the present invention will be described.

The case where channels are switched by a remote control transmitter (not shown) or the like will be described below.

At this time, the tuning circuit 3 outputs to the tuner 1 a channel switching signal having a voltage different depending on the selected channel.

In the tuner 1, the local oscillation frequency changes in response to the channel switching signal, the video and audio intermediate frequencies are output to the video intermediate frequency amplifier circuit 4, and the signal is passed through each circuit as shown in FIG. An image is displayed on the CRT 8 and sound is output from the speaker 12.

At the time of this channel switching, the image displayed on the CRT 8 is disturbed and an unpleasant sound is emitted from the speaker 12, which makes the observer feel uncomfortable.

For this reason, conventionally, when the channel is switched from the channel selection circuit 3, the channel selection circuit 3 outputs the mute signal 15 for a fixed time (mute period) until the image and audio are stabilized. The sound is muted.

The mute signal 15 is output from the channel selection circuit 3 to the video amplification circuit 6 to perform the operation of erasing the video, and is also output to the audio amplification circuit 11 to perform the operation of erasing the audio. To be erased temporarily.

According to the present invention, the mute signal 15 is used to control the shutter switching signal transmission circuit 14.

In this embodiment, a method using infrared rays will be described, but it goes without saying that it is applicable even if a medium such as radio waves is used.

On the other hand, when the channel is switched, the shutter switching synchronizing signal 16 and the mute signal 15 are input from the stereoscopic video circuit 13 to the system control unit in the microcomputer 14a.

The mute signal 15 is recognized by the system control section 14b. If the mute signal 15 is in the mute period, the shutter switching signal is not output even if the shutter switching synchronizing signal is input.

Further, the shutter switching synchronization signal 16
6b, outputs a high signal for the left eye signal and a low signal for the right eye signal every 1/120 second (120 Hz), and the system control unit 14b outputs the signal for the left eye or the signal for the right eye. Determine if it is a signal.

Next, the control operation of the shutter switching signal transmission circuit 14 by the mute signal will be described with reference to the flowchart of FIG.

Here, as described above, the shutter switching L
The / R determination register is set so as to be the left eye (L) at the initial start (when the power is turned on).

First, in step (a), the presence / absence of the mute signal 15 is determined. If the mute signal 15 is not present, the process proceeds to step (b). If the mute signal is present, the presence / absence of the mute signal 15 is performed again. Return to judgment.

In step (b), shutter switching L
/ Determine the contents of the R register. In this embodiment, since the register is set to L when the power is turned on, the process proceeds to step (c).

In step (c), the voltage level of the shutter switching synchronization signal 16 is confirmed. If the voltage level is high, the process proceeds to step (d). If not, the voltage level becomes high in step (c). Keep waiting until.

Next, when the voltage level becomes low, the shutter left eye (L) signal is regarded as the shutter left eye (L) signal in step (e), the shutter left eye switching signal is output, and the shutter switching L / R determination register is set to the right eye. Set to (R).

Then, returning to step (a), after determining the presence or absence of the mute signal, the shutter switching L / R register is determined in step (b).

At step (b), since the shutter switching L / R determination register is set to R, the process proceeds to step (f).

In step (f), the voltage level of the shutter switching synchronization signal 16 is confirmed. If the voltage level is low, the process proceeds to step (t). If not, the voltage level is high in step (f). Keep waiting until.

Next, when the voltage level becomes high, the shutter right eye (R) signal is regarded as the shutter right eye (R) signal, the shutter right eye switching signal is output, and the shutter switching L / R determination register is set to the left eye. Set to (L).

This routine is repeated according to the shutter switching synchronization signal.

On the other hand, if the mute signal is detected, in step (a), the process continues waiting until the mute signal disappears, and during that period, the shutter switching L / R determination register setting switching and the shutter switching signal output are stopped. To be done.

FIGS. 6 and 7 show timing charts of the above-mentioned routine, and FIG. 6 is a timing chart in the state where the mute signal is not input, and FIG.
Is a timing chart in the state where the mute signal is input.

Here, (a) is a mute signal, (b) is a shutter switching synchronization signal, and (c) is the infrared LED 1.
4e is a shutter switching remote control transmission signal modulated by a carrier wave transmitted in 4e.

Further, (d) is a signal obtained by removing the carrier wave component from the above-mentioned shutter switching remote control transmission signal for controlling the wired liquid crystal shutter glasses.

It should be noted that this signal is synchronized with the above-mentioned shutter switching remote control transmission signal.

First, the state in which the mute signal is not input will be described with reference to FIG.

In FIG. 6, in period A, the shutter switching synchronization signal (b) is at high level.

Therefore, the system control unit 14b
Then, it waits until it detects the high level and becomes the low level.

Therefore, if the level becomes low in the period B, the left eye shutter switching signal (L) consisting of two pulses separated by the time t2 from the system controller 14b.
1) is output.

Here, the left eye shutter switching signal (L
The rising edge of 1) is the shutter switching synchronization signal (b)
The time t0 lags behind the trailing edge of the time is because it takes a certain time for the system control unit 14b to determine the shutter switching synchronization signal.

Next, in the period C, the shutter switching synchronization signal (b) becomes high level.

Therefore, in the period C, the system control section 14b outputs the right-eye shutter switching signal (R1) consisting of two pulses at a time t6 apart.

Here, the shutter switching signal for the right eye (R
The rising edge of 1) is the shutter switching synchronization signal (b)
The delay of the time t4 from the rising edge of is due to the fact that a certain time is required for the system control unit 14b to determine the shutter switching synchronization signal.

Thereafter, this operation is repeated according to the shutter switching synchronizing signal.

Here, the time t0 until the left eye shutter switching signal is output and the time t4 until the right eye shutter switching signal is output are set to be the same time in the system control unit 14b. ing.

Further, the left eye shutter switching signal and the right eye shutter switching signal are distinguished by the time difference between t2 and t6, and it is not necessary to be discriminated by this method, but in the present embodiment, the left is selected. The time t2 of the eye shutter switching signal is 2 times the time t6 of the right eye shutter switching signal.
It is set to double.

Next, the state where the mute signal is input will be described with reference to FIG.

The case where the mute signal 15 is input between the time A1 and the time A2 will be described.

In FIG. 7, the mute signal (a) changes from the system controller 14 to the time A1 from time A2.
When it is input to b, the system controller unit 14b detects the fall and fall of the shutter switching synchronization signal, but the system control unit 14b outputs the shutter switching signals (L1) and (R1).
No output.

Similarly, during the period when the mute signal is input, the signal (d) obtained by removing the carrier component from the above-mentioned shutter switching remote control transmission signal for controlling the liquid crystal shutter glasses of the wire type is also output. Not done.

Next, the operation of the liquid crystal shutter glasses will be described.

Note that FIG. 5 is a flowchart of the operation of the liquid crystal shutter glasses, and FIGS. 8 and 9 show the routine of FIG. 6 in the timing chart, and FIG. 8 shows the state in which the mute signal is not input. The timing chart and FIG. 9 are timing charts in the state where the mute signal is input.

In FIG. 8, (a) is a shutter switching synchronization signal, (b) is a remote control transmission signal output from the light receiving circuit 19, (c) is a right-eye shutter switching signal, and (d) is left. This is an eye shutter switching signal.

Further, in FIG. 9, (a) shows the light receiving circuit 1.
9 is a remote control transmission signal output from the camera 9, (c) is a right-eye shutter switching signal, and (d) is a left-eye shutter switching signal.

In step (a) of FIG. 5, since the liquid crystal shutter is driven by a battery, it is necessary to reduce power consumption as much as possible. Therefore, the oscillation of the oscillation circuit 20 is stopped.

Further, the supply of power to the system control section 21, the light receiving circuit 19 and the liquid crystal drive circuit 23 is stopped, and the oscillation circuit 20 starts to oscillate, and at the same time, the power to each circuit described above is supplied. There is.

Next, in step (i), the switch 22
If the switch 22 remains open, the process returns to step (A). If the switch 22 is closed, the process proceeds to step (U).

In step (v), the oscillation circuit 20 starts oscillating to enable the shutter switching signal to be received and the liquid crystal shutter L / R control signal 21a is set to high so as to open the liquid crystal shutter. After setting, the voltage is not applied to the liquid crystal shutter, and the process proceeds to step (e).

In step (e), the leader pulse P of the shutter switching signal is determined and the leader pulse P
If it exists, the process proceeds to step (e), and if it does not exist, the process proceeds to step (s), the liquid crystal shutter L / R signal is held in the high state to open the liquid crystal shutter, and the step again proceeds to step (e). Return to.

Next, in step (o), the time (t2) from the rise of the leader pulse P to the pulse PL for the left eye or the time from the rise of the leader pulse P to the fall of the pulse PR for the right eye. If (t6) is determined and if this time is determined to be t6, it is determined to be the right eye shutter switching signal and the process proceeds to step (or). If this time is determined to be t2, the left eye shutter switching signal is determined. And proceed to step (ku).

In step (or), the liquid crystal drive circuit 2
The signal for the right eye for controlling 3 is set, and the process proceeds to step (ki).

In step (k), the signal for the left eye for controlling the liquid crystal drive circuit 23 is set, and the process proceeds to step (ki).

In step (K), the end bit of the pulse for the right eye or the pulse for the left eye is detected. If the end bit is detected, the process proceeds to step (K). If not detected, the step (E) is performed. Return to.

In step (k), the liquid crystal drive circuit 2
Shutter open / close signal is output to step 3
Proceed to.

In step (K), a shutter switching signal output from the stereoscopic video circuit 13 due to a time for processing the remote control signal and a signal delay in the light receiving circuit,
It eliminates a timing shift from a signal generated by the liquid crystal shutter glasses and output to the liquid crystal shutter drive circuit.

That is, in step (ko), the timing adjustment is performed during the period of time t8 and time t9, and the timing for synchronizing with the shutter switching synchronization signal is adjusted.

If the timing shift is still generated, the synchronization between the image displayed on the screen and the image viewed by the liquid crystal shutter glasses may be disturbed, and the image may not be stereoscopically viewed.

Next, the case where the remote control signal is interrupted, that is, the case where the mute signal is input will be described with reference to FIG.

In FIG. 9, when the mute signal is input from the time point B, the shutter switching signal (a) is interrupted, and when the shutter switching signal is the time point C, the shutter control signal for the right eye (c) and the left eye are controlled. Shutter control signal (d)
Is high, that is, it is in an open state.

By doing so, it is possible to prevent the liquid crystal shutter from being unnaturally opened and closed due to the disturbance of the shutter switching synchronizing signal when the channel is switched.

In the present embodiment, the shutter switching signal output from the stereoscopic video circuit 13 and the liquid crystal shutter glasses generated by the liquid crystal shutter glasses are caused by the processing time of the remote control signal and the delay of the signal in the light receiving circuit. Although the liquid crystal shutter glasses are used to shift the timing from the signal output to the shutter drive circuit, the remote control transmission circuit may transmit the remote control signal in consideration of the timing shift in advance.

Although the infrared remote control system has been described in this embodiment, the present invention can be applied not only to a wireless system using another medium such as radio waves, but also to a stereoscopic image device using wired liquid crystal shutter glasses. Is valid.

[0093]

According to the present invention, with the above-described configuration, an undesired result due to a synchronization deviation between the switching timing of the display image on the CRT and the switching timing of the liquid crystal shutter of the glasses, which occurs at the time of channel switching. The image can be easily blocked by using the muting signal for image blanking, and the observer can recognize the optimal image without discomfort.

[Brief description of drawings]

FIG. 1 is a block diagram of a stereoscopic image device of the present invention.

FIG. 2 is a block diagram of a shutter switching signal transmission circuit.

FIG. 3 is a block diagram of liquid crystal shutter glasses.

FIG. 4 is a flowchart showing an operation of a shutter switching signal transmission circuit.

FIG. 5 is a flowchart showing an operation of a remote control signal of liquid crystal shutter glasses.

FIG. 6 is a timing chart of a shutter switching signal transmission circuit when a mute signal is not input.

FIG. 7 is a timing chart of a shutter switching signal transmission circuit when a mute signal is input.

FIG. 8 is a timing chart of the liquid crystal shutter glasses when a mute signal is not input.

FIG. 9 is a timing chart of the liquid crystal shutter glasses when a mute signal is input.

[Explanation of symbols]

1 tuner 3 political circuit 4 Intermediate frequency amplification circuit 5 Video detection circuit 6 Video amplification circuit 8 CRT 13 3D video circuit 14 Shutter switching signal transmission circuit

Claims (3)

(57) [Claims] 1. A display unit for alternately displaying a left-eye image and a right-eye image for displaying a stereoscopic image, and a blocking unit for alternately blocking the visual fields of the right and left eyes of an observer of the image. And a control signal transmission means for transmitting to the interruption means a control signal for controlling the interruption of the interruption means in synchronization with the display, the control signal transmission means controlling the interruption control means at the time of channel switching. A stereoscopic image device characterized in that signal transmission is stopped for a certain period of time. 2. A tuner means for converting an input signal into an intermediate frequency signal, a channel selecting means for outputting a channel selection signal according to channel selection, and a video signal taken out from the intermediate frequency signal from the tuner means. A video processing means for demodulating the video signal, and a stereoscopic video signal and a shutter switching signal in which a right eye video signal and a left eye video signal are alternately generated based on the intermediate frequency video signal from the video processing means. Stereoscopic image creating means for creating, display means for selecting and displaying demodulated video signal from the video processing means or stereoscopic video signal from the stereoscopic video creating means, and stereoscopic video signal from the stereoscopic video creating means Shutter means for alternately blocking the visual fields of the right eye and the left eye of the observer in response to the display of, and shutter switching synchronization from the stereoscopic image display means. A channel selection signal from the channel selection unit, which is composed of a shutter switching signal transmission unit that creates a shutter switching signal that controls the shutoff of the shutter unit in synchronization with a signal and transmits the shutter switching signal to the shutter unit. According to the above, the display of the video signal or the stereoscopic video signal by the display means is stopped for a certain period, and the transmission of the shutter switch signal from the shutter switch signal transmission means to the shutter means is stopped. 3D image device. 3. The shutter switching signal transmission means comprises:
System control means for inputting a shutter switching signal from the shutter switching signal transmission means and a channel selection signal from the channel selection means, a modulation means for modulating a shutter control signal created by the system control means, and the modulation 3. The stereoscopic image device according to claim 2, further comprising: a light emitting unit that receives the shutter control signal modulated by the unit and transmits the shutter control signal to the shutter unit.