JPS585553B2 - Shingouchikusekisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scan conversion device, and more particularly to a scan conversion device including a storage cathode ray tube with a single electron gun.

In the case of a scan converter including a storage cathode ray tube (hereinafter referred to as a storage tube) having a single electron gun, this single electron gun can be used for reading, erasing, and writing. Must be used for one action.

Recent scan converters perform erasing using a read scan rask, and suspend read operations during the erase period.

Other methods perform a destructive read during the read period, thereby erasing the scanned area over a period of several milliseconds.

In the latter method, the scanned and observed area of the monitoring device is erased in a controllable manner.

U.S. Pat. No. 3,088,048 discloses a means for electrically controlling the duration of an image using a separate observation or reading electron gun in a direct view storage tube, i.e. it uses a series of applied electrical signals. Display as a series of corresponding visible images, each visible image lasting until switched to the next visible image.

This invention is based on commonly assigned U.S. Pat.
595,966, which overcomes the deficiencies of the prior art as fully explained in US Pat.

That is, in this prior art, read erase and write operations are performed in a time-sharing manner using a single electron gun, display of these three operations occurs simultaneously, and selective or complete erase can be performed.

Therefore, in the present invention, a storage tube is used to store images corresponding to input information.

This image is scanned in a rask shape with an electron beam, and a means for detecting a readout signal corresponding to this image is coupled to the storage tube.

As disclosed in the above-mentioned U.S. Pat. No. 3,595,966, during the horizontal retrace period of the rask scan in the read operation, the vertical write input signal is passed through the vertical read/write switch and the vertical deflection amplifier. For example, the gradient wave signal is supplied as a horizontal write input signal to the horizontal deflection means of the storage tube via a horizontal read/write switch and a horizontal deflection amplifier.

Since the electron beam brightness control means and target of the storage tube are controlled to the writing level during this period, the input signal is stored every horizontal retrace period.

Note that since the vertical and horizontal read/write switches pass the input signal only during the horizontal retrace period, they also function as sampling circuits.

This same process continues not only during the horizontal retrace interval, but also during the vertical retrace interval.

The result is a stored image that can be transmitted to a remotely located monitoring device, such as a television monitor.

Furthermore, the vertical scan blanking period is also used for erasing.

In short, no image information is sent from the scan converter at that time.

Therefore, there is no flicker or image loss during observation since the retrace period is normally not displayed on a television type monitor.

Therefore, any part of the image can be erased while the entire storage surface of the monitor device is being observed.

The area of the storage target to be erased is the area scanned by the erasing electron beam.

This area, ie, the deflection position of the electron beam, is determined by the size of the storage surface and the relationship with the amplitude of the scanning signal.

Therefore, by controlling the amplitude of the scanning signal, etc., it is possible to selectively erase any area of the storage target.

Further, in the display of the monitor device that displays the readout signal from the storage target, the stored image in the portion that is not selectively erased is displayed as is.

That is, in the monitor device, the display is partially erased, giving the observer the illusion that the display is changing.

Furthermore, since the time until the accumulated image is erased can be controlled by adjusting at least one of the erase level supplied to the electron gun and the erase level by the accumulation target level controller, the image displayed on the monitor device is gradually It is erased, that is, faded.

Accordingly, one object of the present invention is to provide a scan conversion device having a single electron gun.

Another object of the present invention is to provide an improved scan converter that allows the duration of the image to be varied by controlling the erase time of the stored image so that the image displayed on the monitor can be faded.

Still another object of the present invention is to provide an improved scan converter that is capable of erasing arbitrary areas of a stored image while observing both erased and unerased portions of the image with a monitor device.

The subject matter of the invention is particularly pointed out and claimed in the claims of this specification.

However, both its function and operation, as well as other advantages and objects of the invention, will be better understood by the following description and reference to the accompanying drawings.

A scan conversion device according to the invention comprises a storage cathode ray tube having a single electron gun for generating a controllable electron beam, vertical and horizontal deflection means for deflecting the electron beam, and a storage target, and a storage cathode ray tube for generating a vertical gradient wave. a readout ramp generator; a horizontal readout ramp generator that generates a horizontal ramp wave with a higher frequency than the vertical ramp wave; an erase ramp generator that generates a sawtooth scan signal with a higher frequency than the horizontal ramp wave; first switch means for selectively supplying the ramp wave, sawtooth scan signal and vertical write input signal to the vertical deflection means; and second switch means for selectively supplying the horizontal ramp wave and the horizontal write input signal to the horizontal deflection means. a third switch means for selectively supplying the erase level, read level and write level to the electron gun; and a storage target level controller for selectively controlling the potential of the storage target to the erase level, read level and write level. It is equipped with the following.

In the write operation, the first, second, and third switch means select the vertical write input signal, the horizontal write input signal, and the write level, respectively, and the storage target level controller sets the potential of the storage target to the write level and selects the vertical write input signal, the horizontal write input signal, and the write level, respectively. and an image corresponding to the horizontal write input signal is stored in the storage target.

Further, in the read operation, the first, second, and third switch means select the vertical slope wave, the horizontal slope wave, and the read level, respectively, and the storage target level controller sets the potential of the storage target as the read level and controls the storage target. An electrical signal corresponding to the image scanned and stored by the electron beam is derived from the storage target.

Further, in the erasing operation, the first, second and third switch means respectively select the sawtooth scanning signal, the horizontal slope wave and the erasing level, and the storage target level controller sets the potential of the storage target to the erasing level; The storage target is selectively scanned with an electron beam according to the amplitude of the horizontal slope wave and sawtooth scanning signal, and the erase operation is performed during the vertical retrace period of the read operation, and the erase level supplied to the electron gun during the erase operation is At least one of the erase level and the erase level by the storage target level controller is adjusted to control the time until the stored image is erased.

An embodiment of the present invention will be described below with reference to FIG.
The scan conversion device according to the invention includes a storage tube 1 .

The storage tube 1 uses a single electron gun to form a cathode ray or electron beam, and displays the stored signals at different brightness levels.

This brightness depends on the magnitude of the beam current and the time the beam remains on a particular storage element.

The storage tube 1 used in the invention is of the half-tone type, well known to those skilled in the art, and of the electrical readout type, having an electrical input and an electrical output.

However, the storage tube 1 may also be of the direct-view type with an electrical input and a visible output.

The horizontal and vertical deflection means in the storage tube 1 include a horizontal lead ramp (gradient wave) generator 2 and a vertical lead ramp generator 3 to deflect the electron beam generated by the single electron gun in the storage tube 1.
In the read mode, the target of the storage tube 1 is scanned in a rask-like manner.

Therefore, during read operation, the horizontal read ramp generator 2
is the horizontal read/write switch 4 and the horizontal deflection amplifier 5
and the vertical read ramp generator 3 is connected to the horizontal deflection means H of the storage tube 1 via the vertical ramp switch 6 , the vertical read/write switch 7 and the vertical deflection amplifier 8 . Connected to 1000 steps ■.

For example, a sawtooth rask signal of 60 Hz is applied from the vertical lead ramp generator 3 to each vertical deflection means 157
A 50 Hz sawtooth horizontal rask signal is applied from the horizontal lead ramp generator 2 to the horizontal deflection means H.

As a result, the output of the storage tube 1 is an electrical signal and is applied to a lead signal amplifier 9 for shaping, amplification, etc.

If this electrical signal is input to a monitoring device such as a television monitor, it will produce a plurality of substantially straight lines, such as horizontal lines, with retrace periods between the lines.

Although the vertical lamp switch 6 is not included, the operation of the circuit described above is described in the above-mentioned US Pat. No. 3,595,996.

The vertical lamp switch 6 selects the output of the vertical read lamp generator 3 or the erase lamp generator 18 based on the output of the vertical switch generator 12 and transmits the selected output to the vertical read/write switch 7 .

In order to prevent the electron beam of the storage tube 1 from accumulating a scan line on the target T of the storage tube during the read period, the target T of the storage tube 1 is changed to a read level voltage by the storage target level controller 10 at the same time. The electron beam brightness control means (2) in the storage tube 1 reduces the electron beam to a desired lead level.

Therefore, during the read period, the accumulation target level controller 1
0 applies a potential to the target of the storage tube 1 at which the image stored in the storage target can be read.

The read level regulator 11 can slightly change the target potential during the read period.

A storage target level controller 10 is controlled by a vertical switch generator 12 to obtain vertical timing.

At the same time, the brightness control means (2) of the storage tube 1 is switched to the read brightness level via the erase/read/blanking switch 13, which is substantially similar to the storage target level controller 10.

Therefore, a vertical switch generator 12 and a horizontal switch generator 14 are used to obtain horizontal and vertical timing.
The erase/read/blanking switch 13, which is controlled by
The electron beam intensity of the storage tube 1 is controlled.

A read level adjuster 17 changes the intensity of the read electron beam.

It can be seen that the read signal obtained from the read signal amplifier 9 depends on the intensity of the electron beam and the storage target potential of the storage tube 1.

This read signal is supplied to a monitor device to display the image stored on the storage target T.

Note that if the read electron beam scans the entire area of the storage target T, no image will be displayed on the display screen of the monitor device corresponding to the erased area.

During erasing, the erase signal generator 18 is connected to the vertical deflection means (2) of the storage tube 1 via the vertical lamp switch 6, the vertical read/write switch 7, and the vertical deflection amplifier 8.

As can be seen from FIG. 2, a sawtooth scanning signal with a frequency higher than, for example, 15,750 Hz is applied from the erase signal generator 18 to the vertical deflection stage 1, while the aforementioned horizontal scanning signal is applied to the horizontal deflection means H of the storage tube 1. You may.

In order to erase the storage target T at the same time as the erasing deflection by the horizontal and vertical deflection means, an appropriate voltage level is set via a storage target level controller 10 which can be adjusted by an erase level adjuster 19, and the brightness of the storage tube 1 is controlled. The electron beam of the storage tube 1 is changed to the erase level via the erase/read/blanking switch 13 which can be adjusted by the erase level adjuster 20 in stage (3).

As a result of this operation, the image stored on the storage target T of the storage tube 1 is erased in proportion to the intensity of the electron beam.

Therefore, by adjusting at least one of the erasing level supplied to the electron gun and the erasing level supplied to the storage target, it is possible to control the time until the stored image is erased.

This allows the image displayed on the monitor device to be gradually erased, that is, faded.

Furthermore, as described above, by adjusting the amplitude of the erase scanning signal, that is, the sawtooth scanning signal and the horizontal scanning signal, the scanning area of the electron beam on the storage target T can be controlled, so that any target area can be selectively erased. .

To write or store an image, the input signals to be written are simultaneously applied to the horizontal read/write switch 4, the vertical read/write switch 7 and the read/write switch 15.

When writing a waveform to the storage target T of the storage tube 1, the input to the horizontal read/write switch 4 is generally a horizontal sweep signal, while the input to the vertical read/write switch 7 is the amplitude of the various waveforms. .

During a write operation, the input to the read/write switch 15 must appropriately control the intensity of the electron beam of the storage tube 1 within a writeable range.

Therefore, during the write period, the storage target T of the storage tube 1 is set via the storage target level controller 10 which can be adjusted by the light level regulator 21, while the electron beam is controlled by the write input signal.

Therefore, since the horizontal sweep signal, which is the horizontal write input signal, acts as one with the time axis signal, the waveform of the vertical write input signal is accumulated on the target T, just like an oscilloscope, and its strength (replayed and displayed on the monitor device) brightness) is controlled by the brightness write input signal.

Further, as described above, when the write operation is performed during the horizontal and vertical blanking periods of the rask scan of the read operation, the switches 4, 7, and 15 perform the sampling operation of the input signal.

In order to further understand the operation of the scan conversion device of the present invention, the first
This will be explained below with reference to FIG. 2 together with the drawings.

FIG. 2 shows a diagram of waveforms generated at various parts in the scan converter shown in FIG.

The figure shows the time relationship between each waveform, but for clarity,
Waveform 28, which is a portion of waveform 27, is an exception.

Waveform 22 is horizontal switch generator 14, waveform 23 is horizontal lead ramp generator 2, and waveform 24 is vertical switch generator 1.
2. Waveform 25 is vertical read ramp generator 3, waveform 26 is erase ramp generator 18, waveform 27 is vertical deflection amplifier 8, waveform 29 is brightness voltage amplifier 16, and waveform 30 is storage target level controller 10. Waveform 2 shows the output of
During the horizontal scanning period of 2, that is, excluding the horizontal retrace period, waveform 2
4, the waveform 26 passes through the vertical lamp switch 6, the vertical read/write switch 7, and the vertical deflection amplifier 8 to increase the vertical deflection of the storage tube 1.
This signal applied to is a composite waveform 27 of the previously described waveforms 22, 24 and 26, respectively.

At the same time, the brightness control stage (1) is driven by a signal shown by a waveform 29 amplified by the brightness voltage amplifier 16.

Also, the storage target level controller 10, driven by the vertical switch generator 12, produces a waveform 30 that drives the storage target level controller 12.

Note that the sawtooth scanning waveform 26 of the erase ramp generator 18
The reason why the frequency is higher than the horizontal slope wave frequency of 15,750 Hz is as follows.

That is, during the vertical retrace period of the read scan which is the erase period, a sawtooth scanning signal and a horizontal slope wave are supplied to the vertical deflection means (2) and the horizontal deflection means (H) of the storage tube 1, respectively. The number of cycles of the horizontal slope wave is small.

Also, in order to erase a selected area of the target T, the spacing between rask lines in that area must be short.

Therefore, the frequency of the sawtooth scanning signal is higher than that of the horizontal ramp wave.As can be seen from the six waveforms 27, 29 and 30, the intensity of the electron beam is changed during the horizontal scanning period within the vertical retrace period, and as described above, the sawtooth scanning signal is shaped scanning signal 26 and horizontal slope wave 2
The image of the desired area on the storage target T is erased by controlling the vibration of step 3 and the like.

Additionally, as seen in waveform 30, the erase rate can be increased and done more quickly by increasing the level of storage target T during the vertical retrace period of the normal read scan period.

As is clear from the above description, according to the scan converter of the present invention, a storage cathode ray tube having a single electron gun is used, and the erase operation is synchronized with the read operation. Since this is performed during the retrace period of the rask scan, for example, during the vertical retrace period, it can operate without any discontinuity in the same way as normal television operation, and it also allows the electrical output signal to be sent to a remote monitor, etc. Can be displayed without any problem.

Erase operations will not be displayed on this monitor.

Further, since the electron beam intensity and the accumulated target potential during the erasing operation can be adjusted to desired levels, the duration of the written image can be arbitrarily selected over a wide range.

Although the foregoing description describes the preferred embodiment of the invention, many changes and modifications may be made without departing from the spirit of the invention.
It will be apparent to those skilled in the art that variations may be made.

For example, the variable adjuster 31 of FIG. 1 may be added to provide an adjustable beam current corresponding to the planking level.

1 Brief Description of the Drawings FIG. 1 is a functional diagram of a scan converter according to the present invention;
The figure is a series of waveform diagrams illustrating the operation of the apparatus of FIG. 1.

In the figure, 1 is a storage tube; T, ■, H, and +■ of 1 are targets, vertical deflection means, horizontal deflection means, and brightness control stages, respectively; 2 is a horizontal lead lamp generator; 3 is a vertical lead lamp generator 4 is a horizontal read/write switch; 5 is a horizontal deflection amplifier; 6 is a vertical lamp switch; 7 is a vertical read/write switch; 8 is a vertical deflection amplifier; 9 is a read signal amplifier; 10 is the accumulation target level controller;
11 and 17 are read level adjusters; 12 is a vertical switch generator; 13 is an erase/read/blanking switch; 14 is a horizontal switch generator; 15 is a beam read/write switch; 16 is a brightness voltage amplifier; 18 is an erase lamp generator; 19.20 is an erase level adjuster; 21 is a light level adjuster; 31 is a planking level adjuster; 22, 23, 24, 25, 26. 27 are horizontal switch generators 14, horizontal Output waveforms of read ramp generator 2, vertical switch generator 12, vertical read ramp generator 3, erase ramp generator 18, and vertical deflection amplifier 8; 28
is an enlarged view of 27; 29 and 30 show the output waveforms of the brightness voltage amplifier 16 and storage target level controller 10.

Claims (1)

[Claims] 1 a storage cathode ray tube having a single electron gun for generating a controllable electron beam, vertical and horizontal deflection means for deflecting said electron beam, and a storage target, and a vertical readout gradient wave generator for generating a vertical gradient wave; a horizontal readout ramp generator that generates a horizontal ramp wave with a higher frequency than the vertical ramp wave; an erase ramp generator that generates a sawtooth scanning signal with a higher frequency than the horizontal ramp wave; a first switch means for selectively supplying a sawtooth scan signal and a vertical write input signal to said vertical deflection means; and a second switch means for selectively supplying said horizontal ramp wave and a horizontal write input signal to said horizontal deflection means. a third switch means for selectively supplying an erase level, a read level, and a write level to the electron gun; and a storage target level control for selectively controlling the potential of the storage target to the erase level, read level, and write level. said first, second and third switch means respectively select said vertical write input signal, said horizontal write input signal and said write level in a write operation, and said storage target level controller selects said storage target level controller. With the potential of the target at the write level, an image corresponding to the vertical and horizontal write input signals is stored in the storage target, and in a read operation, the first, second and third switch means respectively control the vertical slope wave, In addition to selecting the horizontal gradient wave and the readout level, the storage target level controller scans the storage target with the electron beam, setting the potential of the storage target to the readout level, and generates an electric current corresponding to the stored image. A signal is derived from the storage target, and in an erase operation the first, second and third switch means select respectively the sawtooth scan signal, the horizontal ramp and the erase level, and the storage target level controller. sets the potential of the storage target to the erase level, selectively scans the storage target with the electron beam according to the amplitude of the horizontal gradient wave and the sawtooth scanning signal, and the erase operation is performed at the same time as the read operation. During the vertical retrace period, adjusting at least one of the erase level supplied to the electron gun during the erase operation and the erase level by the accumulation target level controller until the accumulated image is erased. A scan converter whose specialty is time control.