JPH01248786A - 3D television scope - Google Patents

Abstract

PURPOSE:To eliminate need for processing of the circuitry of a television receiver and the installation of a stereoscopic adaptor by forming a synchronizing signal synchronized with the switching timing of each video information from an optical signal of each video information at the scope side. CONSTITUTION:A 1st video information corresponding to one eye and a 2nd video information corresponding to other eye displayed alternately from the screen 301 of a cathode ray tube of a television receiver 3, and a photoelectric conversion circuit 10 for a stereoscopic television scope 5 receives the optical signal of the video information continuously and convert it into an electric signal. Then a pulse generating circuit 15 generates a shutter switching pulse signal giving a different level when the 1st video information corresponding to one eye is displayed and when the 2nd video information corresponding to other eye is displayed, and right/left shutter switching control is applied by using the shutter switching pulse signal. Thus, a video image is obtained by a conventional television receiver 3 without providing a stereoscopic adaptor and modifying especially the circuitry.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a stereoscopic television scope for stereoscopically viewing images projected on the screen of a television receiver.

(Prior art) Three-dimensional televisions display first image information corresponding to one eye and second image information corresponding to the other eye on each screen (hereinafter referred to as field) consisting of 262.5 scanning lines. The images are alternately displayed on the cathode ray tube, and the left and right shutters of the scope are opened and closed according to the first and second image information, so that the first image information is always shown in one eye and the second image information is always shown in the other eye. By looking at it, we take advantage of the difference in visual perception to obtain images with a three-dimensional effect.

For this purpose, it is necessary to synchronize the switching timing of each video information and the opening/closing of the shutter, and several methods have been proposed when the scope is configured wirelessly with the television receiver. One method is to use a three-dimensional adapter, which will be explained with reference to FIG.

1 is a player for playing laser discs, etc.

The first and second video information output from the playback device 1 are transmitted to the television receiver a3 through the stereoscopic adapter 2.

In television reception fjAm3, the first
The video information and the second video information are displayed alternately, and at the same time, from the transmitter 4 of the stereoscopic adapter 2, a synchronization signal that synchronizes with the switching of the video information is transmitted as a wireless signal such as infrared rays or radio waves. . The receiving unit 6 of the scope 5 receives this wireless signal, converts it into an electrical signal, and converts it into a shutter switching signal by the waveform shaping circuit 7. The shutter switching signal is alternately applied to the shutter drive circuits 8A and 8B, whereby the left and right shutters 9A and 9B are alternately opened and closed in synchronization with the field switching.

JP-A-58-139588 proposes another method that does not use a three-dimensional adapter.

This involves coating a portion of the television receiver's cathode ray tube with a phosphor that has a specific emission spectrum, and each time an electron beam scans that area, the light emitted is received by the light receiving section of the scope, which is then converted into electricity. It converts it into a signal and drives the shutter.

That is, the scope side receives an optical signal of a specific spectrum that is periodically emitted from the cathode ray tube screen for each field as a synchronization signal for field switching and shutter driving, and controls the opening and closing of the shutter.

(Problems to be Solved by the Invention) However, the device using the former method requires a three-dimensional adapter equipped with a transmitter on the television receiver side, making the entire device large and expensive. In addition, although the latter method eliminates the need for a three-dimensional adapter, it requires special processing on the television receiver, which poses a problem in terms of versatility, as it cannot be applied to commercially available television receivers. .

(Means for Solving the Problems) In order to solve the above problems, in the present invention, when the first video information and the second video information are alternately displayed on the CRT screen, each video image is displayed on the scope side. Forms a synchronization signal that synchronizes with the switching timing of each video information from the information optical signal,
This eliminates the need for installing a conventional three-dimensional adapter or processing the television receiver.

(Function) In this way, the present invention alternately projects the first image information corresponding to one eye and the second image information corresponding to the other eye from both sides of the cathode ray tube of the television receiver.
The photoelectric conversion circuit of the 3D television scope continuously receives the optical signal of this video information and converts it into an electrical signal, and then the pulse forming circuit converts this electrical signal into first video information and second video information. A shutter switching pulse signal is formed in synchronization with the switching timing of the video a information, and this acts to control the opening and closing of the left and right shutters, and to open and close the shutters in accordance with the first and second video information. .

(Example) Next, an example of the present invention will be described based on FIGS. 1 to 4.

As shown in FIG. 1, the television receiver 113 is connected to a playback device 1, such as a video tape recorder or a laser disc, which supplies a stereoscopic image signal. The stereoscopic television scope 5 is provided with a photoelectric conversion circuit 10 that receives an optical signal of an image displayed from a cathode ray tube screen 301 and converts it into an electrical signal. The photoelectric conversion circuit 10 includes a light-receiving element (not shown) such as a photodiode, and a drive circuit that drives the light-receiving element. The output signal from the photoelectric conversion circuit 10 is waveform-shaped by the pulse forming circuit 15 and becomes a pulse signal synchronized with the switching timing of the video information.

The pulse forming circuit 15 includes a waveform shaping circuit 11, a charging/discharging circuit 12, a steresis circuit 13, and a D flip-flop circuit 14. The output of 12 is connected to the input of hysteresis circuit 13, and the output of hysteresis circuit 13 is connected to the input of D flip-flop circuit 14, respectively.

As shown in FIG. 4, the charging/discharging circuit has a diode 121 and a resistor 122 connected in parallel between an input terminal 12A and an output terminal 12B, and one of the output terminals is connected to a capacitor 123.
is configured to be grounded via the

The output of the pulse forming circuit 15 passes through a phase-locked loop circuit (hereinafter referred to as pr) 16 and then to a shutter drive circuit 8.
A, given to 8B.

The shutter drive ports R8A and 8B control the opening and closing of the left and right shutters 9A and 9B of the scope 5 according to the input pulse signals.

Note that a changeover switch 17 is connected to the shutter drive circuits (8A) and (8B) in order to reverse the opening/closing control of the shutters 9A and 9B.

Next, the operation of this embodiment will be explained.

The first video information corresponding to one eye and the second video information corresponding to the other eye are alternately transmitted from the playback device 1 to the television receiver I13.

As shown in FIG. 3, in a television receiver (3), an electron beam is emitted from a scanning line (3
08a)(308a)...(308b)(30
8b)... By scanning the top according to the video signal, the video is displayed on the cathode ray tube screen (301). Each scanning line is the first scanning line <3, which is represented by a solid line in FIG.
The first scanning lines (308a゛) (308a)..., which are composed of the second scanning lines (308b) (308b)... represented by broken lines, are shown on the CRT screen. It consists of 262 scanning lines that are almost horizontal to (301) and parallel to each other at equal intervals, and 0,5 scanning lines that end at the bottom center <305), and the second scanning line (308b ) (308b) ... is the top center (306
), and 262 parallel scanning lines arranged at equal intervals between the first scanning lines.

One screen can be displayed by vertically scanning 262.5 first or second scanning lines, and this vertical scanning is called field scanning.

The period of each field is 1/60R.

In general television broadcasting, the first scanning line (308a) < 30
8a)... and second scanning line (308b) (308b)
..., that is, two field scans (2
(screen) shows one scene of video.

However, when displaying a stereoscopic image, the first image information and the second image information are alternately displayed from the cathode ray tube screen (301) in units of fields (one screen).

Therefore, the first video information received by the television receiver f1111 (3) is transmitted from the first scanning line (308a) (308a)
...The electron beam moves upward from the starting point (302) to (303)
) (304) to the end point (305), and the second video information that is subsequently received is at one end (3
06) and ends at the other end (307) while scanning the second scanning line (308b) (308b)...

Video information displayed on the cathode ray tube screen is taken in as an optical signal by a photoelectric conversion circuit 10 of a stereoscopic television scope 5. The photoelectric conversion circuit 10 receives this optical signal from a light receiving element and converts it into an electrical signal. The output signal from the photoelectric conversion circuit 10 is shown in FIG. 2(A).

The optical signal of the first video information displayed on the cathode ray tube screen (301) appears as an electrical signal between D1, and appears as an electrical signal between the optical signal α of the second video fMm information.

By the way, image information is displayed on the cathode ray tube screen (301) while the electron beam scans the scanning line (308). For example, from the end point <303) to the start point (304) in FIG. Or each scan line (308a) (30
The scanning between 8b) (blank line) is blanked and no video information is displayed.

During this time, the light receiving element of the photoelectric conversion circuit 10 does not receive light, so the signal level becomes 0 between tl, ↑, and 2 corresponding to this period in FIG. 2(A).

In this way, peaks approximately equal to the number of scanning lines in each field appear in the signal waveform between D1 and ), resulting in the waveform shown in FIG. 2(A).

The output signal of the photoelectric conversion circuit 10 (FIG. 2(A)) is input to a waveform shaping circuit 11 consisting of a bandpass amplifier and a comparator (not shown).

As mentioned above, one field of this input signal is 1/60
(S), and since each field has five 262° scanning lines, it is an electrical signal with a unique frequency of 15.75kl12, and the waveform shaping circuit 11 amplifies this input signal in a frequency band of 15°75kh7. Then, a rectangular wave signal shown in FIG. 2(B) is formed through a comparator. Subsequently, the rectangular wave signal shown in FIG. 2(B) is input to the input terminal 12A of the charge/discharge circuit 12.

The charging/discharging circuit 12 repeats charging and discharging of the capacitor 123 for each rectangular pulse, but since the discharging is performed through the resistor 122, the capacitor 123 is charged rapidly and discharged slowly.

As a result, the signal appearing at the output terminal 12B has the waveform shown in FIG. 2(C) with different rising and falling slopes. This electrical signal is input to the hysteresis circuit R13. In the hysteresis circuit M13, the input signal and the reference voltage are compared and the signal is set to HIGH.
A rectangular pulse signal consisting of a level "1" and a LOW level "0" is formed. That is, when the input signal (FIG. 2 (C)) rises, the input signal is compared with the reference voltage e1,
When the reference voltage e1 is exceeded, a signal of level "1" is output.

When the input signal falls, the reference voltage ez (
e+>ex), and when the input signal becomes less than the reference voltage 0, the output signal changes from "1" to "0".

In this way, the electrical signal shown in FIG. 2(C) is converted into the pulse signal shown in FIG. 2(D) by the steresis circuit 13. The pulse signal of FIG. 2(D) becomes the pulse signal of FIG. 2(E) whose level changes only when the signal level changes from "1" to "0" by the D flip-flop circuit 14.

This pulse signal is transmitted to the D where the first video information is displayed.
1 and D2, where the video information in FIG. 2 is displayed, are at different levels, and in FIG. 2, between D1 (1) and D2 (0).

That is, a shutter switching pulse signal can be obtained that is synchronized with the switching timing between the first video information and the second video information. The signal from this D flip-flop circuit (14) is
, (16) through the shutter drive circuit (8A) (8B)
sent to. The PLL (16) forms a loop, compares the phases of the output signal and the newly input input signal, and provides a transmission control voltage according to the phase difference to a voltage control oscillator (not shown). , which generates an output signal that slowly follows the frequency and phase changes of the input signal.

The frequency and phase of the shutter switching pulse signal can be checked using a scope (,
5) does not change while receiving the optical signal of video information, but for example, if the light reception is temporarily interrupted due to someone passing between the cathode ray tube screen (301) and the scope 5. Due to the PLL (16), the frequency and phase do not change suddenly, and the synchronization is not disturbed. The shutter drive circuits (8A) (8B) drive shutters (9A) (9B) corresponding to the left and right eyes of the scope (5), and when a shutter switching pulse signal is received, the shutters (9A) < 9R).

For example, when a shutter switching pulse signal of "1" level is input to the shutter drive circuit (8A)<8B), the shutter drive circuit (8A) controls to open the shutter (9A), and the shutter drive circuit (8B) controls to open the shutter (9A). ) is the shutter (9B)
control to close.

Conversely, when the "θ" level shutter switching pulse signal is input, the shutter drive circuit (8A) controls the shutter (9A) to close, and the shutter drive circuit (8B) controls the shutter (9B) to open. Control.

Therefore, the shutter switching pulse signal in FIG. 2 (F,) is
When input to the shutter drive circuits (8A) (8B), since the level is "1" between D1 where the first video information is displayed, the shutter (9A) opens, and at this time the shutter (9B) closes.

In addition, “0” is displayed between the second video information
, the shutter (9A) is closed and the shutter (9B) is opened.

In this way, the first image information can always be seen with the eye on the shutter (9A) side, and the second image information can always be seen with the eye on the shutter (9B) side, but in the initial stage of using the scope, , the level of the shutter switching pulse signal is reversed,
Each piece of video information may be seen with opposite eyes, such as the first video information being seen on the shutter (9B) side.

This forms the shutter switching pulse (E) in FIG. 2 from the interval t and z where no image is projected due to blanking in FIG. 2 and the interval D1 or ) where the image is displayed,
This is because, in the process of pulse formation, the electrical signals between D1 and ) are not treated as different signals.

Therefore, depending on the timing when the scope first receives the optical signal, a shutter switching pulse signal may be formed that is O" level between D1 and "1" level between D2 in FIG. 2 (E). This causes the above-mentioned problem.

Therefore, in this embodiment, a changeover switch 17 is provided in the scope 5, and the control of the shutter drive circuits (8A) and (8B) is reversed by the changeover switch 17.

That is, when the operation switch 17 is operated, the opening/closing operations of the left and right shutters <9A) (9B) are reversed, and the shutters that were open with the 11'' level pulse signal are closed, and the shutters that were closed are now open.

Alternatively, a changeover switch circuit (not shown) operated by the changeover switch 17 may be provided between the PI, Li2 and the shutter drive circuits (8A) (8B) to reverse the level of the shutter changeover pulse signal. You can.

The shutters (9A) (9B) whose opening and closing are controlled by the shutter drive circuit (8A) < 8B) are liquid crystal shutters that transmit light by controlling their opening. As long as the shutter responds to switching between the first video information and the second video information, an electromagnetically driven shutter such as that used in a camera shutter or the like may be used.

In the above embodiment, the pulse signal of FIG. ), the shutter switching pulse signal (FIG. 2(E)) having different levels is formed, but the shutter opening/closing control can be performed using the pulse signal of FIG. 2(D) as it is as the shutter switching pulse signal. In this case,
The pulse signal in FIG. 2(D) is transmitted during the switching of video information (t
2), the level changes once from 1" to "0", so
Every time the input signal changes from “1” to “0”, the shutter (
A shutter drive circuit (8A) (8B) is used to reverse the opening/closing operation of 9A)<9B).

(Effects of the Invention) As described above, according to the present invention, 3! ! ! A photoelectric conversion circuit converts an optical signal of video information projected like a pillow into an electrical signal, and from this electrical signal, a difference is made between the time when the first video information corresponding to one eye is projected and the second video information corresponding to the other eye. Since we decided to form a shutter switching pulse signal that has a different level during the time when video information is displayed, and to control the opening and closing of the left and right shutters using the shutter switching pulse signal, there is no need to provide a three-dimensional adapter, and there is no need for special processing. This has the effect that it is possible to obtain images with a three-dimensional effect using a general television receiver without having to do so.

[Brief explanation of the drawing]

1 to 4 relate to one embodiment of the present invention. FIG. 1 is a block diagram of a stereoscopic television scope according to the present invention, and FIG. 2 is a block diagram of the scope at each stage in the block diagram of FIG. 1. A waveform diagram showing a comparison of waveforms, Fig. 3 is a schematic diagram showing the scanning line of a cathode ray tube, Fig. 4 is a circuit diagram showing the configuration of a charging/discharging circuit, and Fig. 5 is a conventional 3D television using a 3D adapter. It is a block diagram of a scope for use. 1...Player 2...Stereoscopic adapter 3...Television receiver 301...Cathode ray tube screen 308A, 308B...Horizontal scanning line 4... ...Transmitter 5...Scope 6...Receiver 7...Signal forming circuits 8A, 8B...Shutter drive circuits 9A, 9B...Shutter 10 ......Photoelectric conversion circuit 11...Waveform shaping circuit 12...Charging/discharging circuit 13...Steresis circuit 14...D flip 170 tube Circuit 15...
... Pulse forming circuit 16 ... Phase-locked loop circuit (PLI, >1
7... Selector switch Figure 3

Claims (2)

[Claims] (1) The first video information on the cathode ray tube screen in a television receiver configured to alternately display first video information corresponding to one eye and second video information corresponding to the other eye on the cathode ray tube screen; In a stereoscopic television scope that opens and closes left and right shutters in response to switching of second video information to obtain a stereoscopic image from the cathode ray tube screen, the optical signal of the video information projected from the cathode ray tube screen is continuously transmitted. a photoelectric conversion circuit that receives light and converts the optical signal into an electrical signal; and a time during which at least the first video information is displayed and a time during which the second video information is displayed based on the electrical signals output from the photoelectric conversion circuit. A three-dimensional object comprising: a pulse forming circuit that forms a shutter switching pulse signal having different levels depending on the pulse forming circuit; and left and right shutters whose opening and closing are controlled by the shutter switching pulse signal output from the pulse forming circuit. Television scope. (2) the first video information on the cathode ray tube screen in a television receiver configured to alternately display first video information corresponding to one eye and second video information corresponding to the other eye on the cathode ray tube screen; In a stereoscopic television scope that opens and closes left and right shutters in response to switching of second video information to obtain a stereoscopic image from the cathode ray tube screen, the optical signal of the video information projected from the cathode ray tube screen is continuously transmitted. a photoelectric conversion circuit that receives light and converts the optical signal into an electrical signal; and a pulse forming circuit that forms a shutter switching pulse signal whose level changes once during switching of the video information from the electrical signal output from the photoelectric conversion circuit. A stereoscopic television scope comprising: a circuit; and left and right shutters whose opening and closing are controlled by the shutter switching pulse signal output from the pulse forming circuit.