JP2536792B2 - Shutter control signal generator for stereo stereoscopic display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention alternately displays images corresponding to left and right eyes on the same display screen, and synchronously operates left and right shutters. The present invention relates to a shutter opening / closing signal generator for a stereoscopic display device that opens and closes to display three-dimensional information in stereo, and can be applied to image display devices of different models without changing the hardware of the image display device. And a shutter control signal generator for a compact and simple stereoscopic display device.

(Prior Art) Conventionally, in a device in which left and right images are alternately displayed on the same screen, and left and right shutters are opened and closed in synchronization with the stereo display, a shutter opening / closing synchronization signal is generated by the image display device itself. The method was mainstream. There is also a method of displaying a synchronization signal mark on the display screen and synchronizing by detecting it.However, marks corresponding to both the left and right shutter open / close signals are displayed, and the left and right shutters are controlled independently by each. That was equivalent.

Also, there are mechanical shutters, but PLZT
Non-mechanical devices such as liquid crystal and liquid crystal have become mainstream. Particularly recently, liquid crystal shutters having a driving circuit as shown in FIG. 6 have been widely used.

(Problem to be Solved by the Invention) In the conventional method of generating the shutter opening / closing signal by the image display device itself, the stereoscopic display shutter can be used only by the model. Further, in the method of detecting the shutter opening / closing signals of both eyes from the screen, a total of two optical sensors are used for each of the right and left eyes, and the display of the synchronization signal mark and the arrangement of the optical sensors are limited. However, in the conventional device, the control circuit is not very simple.

(Means for Solving the Problems) In order to solve the above-described problems, a left-eye image and a right-eye image having a synchronization signal mark in at least one of the images are alternately displayed on the same screen to form a three-dimensional spatial image. The shutter control signal generator of the stereoscopic display device for displaying
According to the present invention, a device for detecting a synchronization signal mark on said one image and generating a synchronization signal pulse, which starts in synchronization with the synchronization signal pulse and is longer than one screen display time and shorter than two screen display times. Circuit for generating a control pulse having a length ending at the end of the next other image, and generating the other image observation shutter closing signal starting at the end of the control pulse and continuing for one screen display time. circuit,
A circuit for generating a negative signal of the observation shutter closing signal for the other image, and a circuit for generating the observation shutter closing signal for the one image from a logical product of the control pulse and the negative signal. Have.

Further, according to the present invention, the shutter control signal generator includes:
A device that detects a synchronization signal mark on one screen and generates a synchronization signal pulse, starting at the end of the synchronization signal pulse,
A circuit for generating a first control pulse of a length ending within less than one screen display time, repeatedly triggered by said synchronization signal pulse and lasting for more than two screen display times from each synchronization pulse; A circuit for generating one control pulse, a circuit for generating the one image observation shutter closing signal, starting at the end of the first control pulse, and continuing for one screen display time; A circuit for generating a negative signal of the observation shutter closing signal; and a circuit for generating the observation shutter closing signal of the other image from a logical product of the second control pulse and the negative signal. .

(Operation) The synchronization signal generation means detects the emission of the synchronization signal mark displayed on the screen or the light emission of an LED or the like due to the signal that has detected the emission of the synchronization signal mark, and shapes and shapes the synchronization signal pulse. Generate. The control pulse generating means generates a control pulse that ends at the end of the other image display, using the synchronization signal as a trigger. With the end of the control pulse as a trigger, a closing signal of the other image observation shutter having the same length as one image display period is generated. Although a signal given as the negation of the closing signal of the other image observation shutter can be used as a closing signal of one image observation shutter, the signal can be stereoscopically viewed. State, which corresponds to a shutter closed state. When no image is displayed, one of the image observation shutters is closed, which is inconvenient. For this reason, a closing signal of one image observation shutter is generated on condition that there is a signal given as a negative of the other image observation shutter closing signal and that a synchronization signal pulse exists within a predetermined time. Claim 1 wherein the minimum width of the control pulse is longer than one image synchronization.
As the configuration described in the paragraph, as the signal indicating that the synchronization signal pulse exists within the predetermined time, a control pulse that starts in synchronization with the synchronization signal and ends at the end of the next other image display is a control pulse. As a logical product of this and the negation of the closing signal of the other image observation shunter, a closing signal of one image observation shutter can be generated.

(Example) FIGS. 1A and 1B are conceptual diagrams of the present invention. FIG. 1A shows a case where a stereo stereoscopic display device shutter controller and a photosensor for detecting a synchronization signal mark on the screen are connected by a signal line, and FIG. 1B shows a synchronization signal mark displayed on the screen. Is detected by a photosensor, a light source such as an LED is emitted by the signal, and the light is received by the photosensor to detect a synchronization signal. In the latter case, there is no need to connect the display device and the stereo display shutter control device with a signal line, so that restrictions on the behavior of the observer can be reduced.

FIG. 2 shows an embodiment of a shutter control signal generating circuit for a stereoscopic display device according to the present invention. For construction of Figure 1A, light emitted from the display screen S _C mark for synchronization signal are displayed by superposing a display image on M is detected by the photosensor P, the detection signal S _P is generated. In the case of FIG. 1B, the light is detected by the photosensor P, and is converted again into an optical signal by the LED light emitting device LE according to the signal. This light is detected by the photo sensor P ', and a detection signal _SP is generated. In signal S _P is the synchronizing signal generating circuit X detected by the photo sensor, after being converted to a voltage pulse by the operational amplifier, resistors, is shaped by the integrated waveform shaping circuit composed of a capacitor and an inverter, TTL logic level synchronization A signal pulse S is output. The synchronization signal pulse S is output from the control pulse generation circuit Y.
And a control pulse D is generated which is triggered at the start or end edge of the synchronization signal pulse S and ends when the display of the other image longer than one screen display cycle and shorter than the screen display cycle ends. . Typically, an integrated circuit such as 74123 is used, as shown in FIG. By changing the variable resistance of 30 KΩ in the figure, the width D of the control pulse can be changed, and the end time of the control pulse is related to the display position of the synchronization signal mark on the display screen, and the other image ends. The phase of the display image and the phase of the shutter opening / closing signal can be matched by adjusting so as to match the time point. The shutter open / close signal generation circuit Z at the next stage generates the other image observation shutter close signal Q which starts at the end edge of the delay pulse D and ends after the same time as one screen display cycle. For this purpose, an integrated circuit such as 74123 is used similarly to the generation of the control pulse, and the negation of the shutter closing signal Q is also output at the same time. Delay pulse D
And a signal Q given as the negation of the first pulse Q to generate one of the shutter closing signals for image observation. The output first pulse Q is used as a shutter signal for the left (right) eye shutter, and the second pulse (D #) is used as a shutter signal for the right (left) eye shutter. FIG. 3 shows a timing chart of signals generated by the circuit shown in FIG. Various modifications can be considered for the portion Z in FIG. 2 depending on the type of element used.

In the embodiment shown in FIG. 2, the width of the control pulse is set to be longer than one screen display period, so that the presence of the synchronizing signal pulse can be confirmed by the presence of the control pulse signal D.
When the width of the control pulse is set to be shorter than one screen display period, a means for generating another signal for confirming the presence of the synchronization signal, that is, repeatedly triggered by the synchronization signal pulse, and one pulse from each synchronization pulse is used. It is necessary to provide a retriggerable circuit for generating a second control pulse lasting longer than the screen display time, and to confirm the presence of the synchronization signal by the presence of its output signal. FIG. 4 shows this case.
In this figure, the retriggerable circuit is an integrated circuit 74123 which receives a synchronization pulse S and generates a second control pulse D '. This embodiment differs from the embodiment shown in FIG. 2 in that the second control pulse D 'is ANDed with the negative signal of the one-image observation shutter-close signal to generate the other image-observation shutter-close signal. .

FIG. 5 shows a timing chart of the operation. First
The width of the control pulse D is set shorter than one screen display cycle,
The second control pulse D 'confirming the presence of the synchronizing signal S is repeatedly triggered by the synchronizing signal pulse S as shown by the dashed line, and lasts for more than two screen display times from each synchronizing pulse. This second control pulse D 'and one (right)
The other (left) image observation shutter close signal is generated as the logical product of the negative signals of the observation shutter close signal Q of the image.

In the embodiment shown in FIG. 2, since the minimum width of the control pulse is longer than one screen display period, the above-mentioned special means can be omitted to confirm the existence of the synchronization signal pulse. , The circuit has been simplified.

(Effects of the Invention) According to the present invention, since the image display device and the stereoscopic shutter control device can be operated without being electrically connected, the image display device can be operated without changing the hardware of the image display device. Even with any type of image display device, a stereoscopic shutter can be provided to easily realize stereoscopic stereoscopic vision. Further, only one type of synchronization signal is detected from the screen, and the restriction on the display of the synchronization signal mark and the arrangement for detecting the mark is remarkably relaxed as compared with the case where two types of synchronization signals are used. The shutter opening / closing control signal generation circuit is extremely simplified, and the shutter opening / closing control device can be remarkably small and simplified, the simplicity is improved, the number of failures is reduced, and the manufacturing cost is reduced.

Further, the light input to the synchronization signal mark emission detecting means is configured to detect the emission of the synchronization signal mark on the screen and to receive light emitted from a light source such as an LED according to the signal, thereby displaying the display device. The signal line between the optical sensor on the screen and the stereoscopic shutter control device becomes unnecessary, and the restriction on the operation of the observer is relaxed.

[Brief description of the drawings]

1A and 1B are conceptual diagrams of a stereoscopic display system of the present invention, and FIG. 1A shows that a signal line is provided between a photosensor for detecting a periodic signal on a display screen and a shutter opening / closing control device. This is a necessary example, and FIG. 1B is an example in which a signal line is unnecessary. FIG. 2 shows an embodiment of a shutter opening / closing signal generation circuit for a stereoscopic display device constructed according to the present invention. FIG. 3 shows a timing chart of signals in the embodiment shown in FIG. FIG. 4 shows an embodiment of a shutter opening / closing signal generating circuit for a stereoscopic display device constructed according to claim 2 of the present invention. FIG. 5 shows a timing chart in the second embodiment of FIG. FIG. 6 shows an example of a conventional liquid crystal shutter drive circuit. (Reference Numerals) S _C ...... display screen, F _g ...... display image, F _S ...... stereoscopic image, M ...... synchronization signal marks, P, P '...... photosensor, LE ...... emitter, M '... Synchronous signal light, _SP ... Photocurrent signal, X ... Synchronous signal generation means, S ... Synchronous signal, Y ... Delay pulse generation means, D ... Delay pulse, Z ... Shutter open / close signal Generating means, D _L ... stereoscopic shutter driving section, L _g ... liquid crystal shutter, Q ... first pulse ... pulse given as the negation of the first pulse, D∧ ... second pulse, L, R: Left and right shutter opening / closing signals, D ': Second control signal.

Claims (2)

(57) [Claims] 1. A shutter control signal generator for a stereoscopic display device for displaying a three-dimensional spatial image by alternately displaying a left-eye image and a right-eye image having a synchronization signal mark on at least one image on the same screen. An apparatus for detecting a synchronization signal mark on one of the images and generating a synchronization signal pulse, wherein the apparatus starts in synchronization with the synchronization signal pulse and is longer than one screen display time and shorter than two screen display times. A circuit for generating a control pulse having a length ending at the end of the next other image, and generating the other image observation shutter closing signal starting at the end of the control pulse and continuing for one screen display time. A circuit for generating a negative signal of the shutter closing signal for observing the other image; and observing the one image from a logical product of the control pulse and the negative signal. Shutter control signal generator of stereoscopic display device characterized in that it comprises a circuit for generating a No. shutter closing signal. 2. A shutter control signal generator for a stereoscopic display device for displaying a three-dimensional spatial image by alternately displaying a left-eye image and a right-eye image having a synchronization signal mark on at least one image on the same screen. An apparatus for detecting a synchronization signal mark on one of the images to generate a synchronization signal pulse, a first control having a length starting at an end of the synchronization signal pulse and ending within a time shorter than one screen display time. A circuit for generating a pulse; a circuit for generating a second control pulse that is repeatedly triggered by the synchronization signal pulse and lasts longer than two screen display times from each synchronization pulse; A circuit for generating the one-image-observation-shutter-close signal, which starts at the end and lasts for one screen display time, and a negative signal of the one-image-observation-shutter-close signal And a circuit for generating a shutter close signal for observing the other image from a logical product of the second control pulse and the negative signal. Shutter control signal generator.