JPH0614671B2 - Image display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for displaying image information converted into an electrical signal as a visible image that can be visually recognized.

[Prior art]

Conventionally, a CRT (cathode ray tube) type display device has been widely used as this type of display device, but the applicant of the present application uses an endless belt-shaped image carrying member as an alternative to such an image display device. We have developed and proposed an image display device.

A side sectional view of this image display device is shown in FIG. In FIG. 1, an endless belt-shaped photoreceptor 8 (hereinafter referred to as an image carrier) as an image carrier is guided by guide rolls 9, 10, 11 and 12 in a predetermined casing 1 and is intermittently driven by a driving means (not shown). A belt-shaped photoconductor is installed, and a semiconductor laser (not shown) modulated by an image electric signal is provided.
The scanner 5 scans the output light in one direction and further exposes the back surface of the belt-shaped photoreceptor 8 via the f-θ lens 6 and the mirror 7. This photoconductor 8 is
For example, a photoconductive layer is provided on a transparent and conductive substrate.

A developing device 15 provided with a sleeve 17 having a magnet 16 rotating in the direction of the arrow in the figure is provided opposite to the surface of the belt-shaped photosensitive member 8 at the exposure position A, and the conductive material supplied to the sleeve surface is provided. The developer 18 having properties and magnetism contacts the surface of the photoconductor while being uniformly regulated by the blade 19. A direct current voltage source (not shown) applies a direct current voltage between the sleeve 17 of the developing device 15 and the base of the photoconductor, and rollers 13 and 14 are provided in the vicinity of the exposure and development positions. As a result, the belt-shaped photoconductor 8 is kept flat and the distance between the surface of the photoconductor and the sleeve of the developing device is accurately kept constant. Then, at the position A facing the developing device 15, the toner image written and formed on the surface of the belt-shaped photoreceptor by the irradiation of the beam light is sent to the display unit 2.

The display unit 2 is formed so that a rectangular window hole 3 is provided on the front surface of the housing 1 and a toner image on the photoconductor can be directly viewed from the outside through a transparent member 4 that covers the window hole 3.
The photosensitive member 8 can be stopped automatically or when a predetermined visible image area coincides with the position of the window hole 3 or by a switch operation for an arbitrary time. Thus the window hole 3
The toner image on the surface of the photoconductor can be visually observed through the transparent member 4. The lamp 20 is for erasing the history of the photoconductor, and is turned on as needed only while the belt-shaped photoconductor is moving, and is turned off when stopped.

As the image forming method of this apparatus, the method disclosed in JP-A-58-98746 or JP-A-58-98748 can be used. Since the image display device as described above inputs the image information converted into an electric signal from the outside and displays an image corresponding to the electric signal as a visible image, the image information converted into the electric signal is generally stored. It is used by being electrically connected to a memory circuit for storing or an external device such as an information recording device (for example, an optical disc device) for reproducibly recording image information on an information recording medium (for example, an optical disc).

In many cases, a system controller or the like as a control device for instructing and controlling the information transfer operation between the information recording device or the memory circuit or the like and the image display device is connected between them.

Further, with the development of information transfer technology or communication technology, an information recording medium or memory circuit for storing or storing image information and a control device such as a system controller are mainframes, and an image display device is a terminal device. By configuring the image information processing system,
It is possible to operate an image display device placed at a physically separated place by a control device such as a system controller in a mainframe.

In this way, when the control device in the mainframe and the image display device, which is a terminal, are physically separated, the control device operator and the viewer of the image display device may be different. The inconvenience occurs as shown.

That is, when the viewer of the image display device is viewing the display image, the control device operator of the mainframe performs a display image update operation for displaying a new image on the display unit of the image display device. There is a drawback that a different image is displayed even though the viewer is viewing the image, and the image that was being viewed by the viewer becomes invisible on the display unit.

In addition, in order to display the above-mentioned image that was in the middle of visual observation again, it is necessary to retrieve the image information again from the external device and input it to the image display device, which has a drawback that the operation becomes complicated.

Further, in particular, when two images are alternately referred to be visually recognized, an operation of retrieving image information from an external device and inputting the information from the external device must be performed every time reference is required. This is extremely complicated, and there is a drawback in that work efficiency is reduced.

[Object of the Invention]

An object of the present invention is to eliminate the above drawbacks, and an image display that allows a viewer to maintain an image that needs to be displayed during or during visual recognition on the display unit without being updated from the outside. To provide a device.

Another object of the present invention is to provide an image display device that does not cause any inconvenience even if a viewer inputs new image information from an external device while viewing an image.

Still another object of the present invention is to provide an image display device with good operability by simplifying the operation of alternately referring to two images.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

2 and 3 show an embodiment of the image display device according to the present invention, FIG. 2 is a side sectional view, and FIG. 3 is an external front view.

In FIG. 2 and FIG. 3, all the members having the same reference numerals as those in FIG. 1 have the same function, and therefore the explanation thereof is omitted.

A memory 50 is provided in the housing 1, and the memory 50
Has a storage capacity capable of storing image information for one page of an image.

Further, the interface 51 is provided for communicating signals with external devices.

An illumination lamp 52, a mirror 53, a lens 54, and a CCD 55 as an image reading unit are arranged above the device, and light emitted from the illumination lamp 52 is applied to the belt-shaped photoconductor 8.
The reflected light image passes through a mirror 53, a lens 54 and a CCD 55.
Imaged above. Therefore, by moving the belt-shaped photoconductor 8 in the direction C in the figure, the image carried on the belt-shaped photoconductor 8 and displayed on the display unit 2 can be read by the CCD 55 and the image information can be converted into an electric signal. it can.

An operation unit 56 is provided below the display unit 2, and the operation unit 56 includes five operation buttons S1 to S5 and two lamps L1.
And L2 are located.

The operation button S1 is a switch for prohibiting the input of image information from an external device to the image display device, and the operation button S1
By pressing S1, the lamp L1 indicating that the image information input is prohibited is turned on.

The operation button S2 is a switch that releases the input prohibited state and allows the input of image information from the external device to the image display device. When the operation button S2 is pressed, the lamp L1 is turned off.

When the image information from the external device is input to the image display device, the operation button S3 displays the image information as a visible image on the display unit 2.
It is a switch for displaying.

The operation button S4 is a switch for storing the image information in the memory 50 when the image information is input from the external device to the image display device, and when the operation button S4 is pressed, the above state is displayed. The indicated lamp L2 lights up. The lamp L2 is turned off by pressing the operation button S3.

The operation button S5 is the image information displayed on the display unit 2,
This is a switch for replacing the image information stored in the memory 50. When the operation button S5 is pressed, the image information stored in the memory 50 is carried as a visible image on the belt-shaped photoconductor 8. The CCD 55 reads the image information that has been displayed until then, converts it into an electric signal, and stores it in the memory 50.

FIG. 4 is a block diagram of an electric circuit according to an embodiment of the present invention.

In FIG. 4, reference numerals 60 and 61 denote lamp driving circuits for driving the lamps L1 and L2, respectively, and 62 drives the belt-shaped photosensitive member 8 of the image display device or the scanner 5 to perform an image display operation. Display drive circuit for 63, memory 50
Memory drive circuit for driving, and 64 CCD55
Is a CCD drive circuit for driving the. Further, 65 is a laser drive circuit for modulating the laser in accordance with the input image information signal, and 66 is read by the CCD 55,
An image processing circuit for performing image processing such as A / D conversion for converting image information converted into an analog electric signal into a digital signal and dither processing.

F1 to F3 are R / S flip-flops, and G1 to G3 are AND gates.

The input start signal DST is a signal for notifying the image display device that image information is sent from an external device,
The video signal VIDEO is an image information signal converted into an electric signal.

When the operation button S1 is turned on, the flip-flop F1 is set, and the output Q becomes High or Low. When the output Q of the flip-flop F1 becomes High, the lamp drive circuit 60 is driven and the lamp L1 is turned on to indicate that the image information input is prohibited. Further, the image information input prohibition signal IHBT is output to the external device via the interface 51. Further, since the output of the flip-flop F1 becomes Low, even if the DST signal is input, it does not proceed beyond the AND gate G1, so that the image display device does not perform any operation when the VIDEO signal is input.

When the operation button S2 is turned on, the flip-flop F1 is reset, the output Q becomes Low and the output becomes High. Therefore, the lamp driving circuit 60 stops driving the lamp L1 and turns off the lamp L1.

Moreover, the IHBT signal is not output. Furthermore, when the DST signal is input, the DST signal is ANDed because the output is High.
You can pass through gate G1. As described above, by operating the operation buttons S1 and S2, the input of the image information input start signal DST can be prohibited or permitted as necessary.

The DST signal passed through AND gate G1 is AND gates G2 and G3.
Entered in. Here, when the operation button S3 is ON, the flip-flop F2 is set and the output Q is Hi.
Since the output goes low again to gh, the DST signal is AND gate G
Due to 2 and G3, they are input to the display drive circuit 62 but not to the memory drive circuit 63. Also, the VIDEO signal is input to the display drive circuit 62 and the memory drive circuit 63, but the display drive circuit 62 is driven by the DST signal, whereas the memory drive circuit 63 does not input the DST signal. The device performs a predetermined image display operation,
The contents of memory 50 do not change. Further, since the output of the flip-flop F2 is Low, the lamp drive circuit 61 does not work and the lamp L2 does not light.

On the other hand, when the operation button S4 is turned on, the flip-flop F2 is reset, the output Q becomes Low and the output becomes High, so that the lamp drive circuit 61 is driven and the lamp L2 is turned on. Further, the DST signal that has passed through the AND gate G1 is input to the memory drive circuit 63 but not to the display drive circuit 62 by the AND gates G2 and G3. Therefore, the image display device does not perform the image display operation, and the input VIDE
All the O signals are input to the memory 50 by the memory drive circuit 63.

As described above, by operating the operation buttons S3 and S4, it is possible to select whether to display the input image information as needed or to store it in the memory 50.

When the operation button S5 is turned on, the flip-flop F3 is set and the output Q becomes High. Therefore, the display drive circuit 6
2. All of the memory drive circuit 63 and the CCD drive circuit 64 are driven, and the image information stored in the memory 50 is transferred to the laser drive circuit 65 and displayed as a visible image. On the other hand, the already displayed image information read by the CCD 55 is stored in the memory 50 via the image processing circuit 66. Therefore, by turning on the operation button S5, the displayed image information and the image information stored in the memory 50 can be exchanged.

When the above operation is completed, the memory drive circuit 63
Signal is output from the flip-flop F3 to the reset terminal of the flip-flop F3, and the NOT gate G4 resets the flip-flop F3.
63 and CCD drive circuit 64 all stop their operation.

〔effect〕

As described above, according to the present invention, it is possible to alternately and repeatedly display the image currently displayed and the image stored in the memory with a memory having a smaller capacity than before, and further, to display the image so far. It is possible to eliminate the process of inputting the image again from the outside.

Further, according to the present invention, it is possible to accept new image information while displaying a required display image on the display unit.

Further, according to the present invention, it is possible to prohibit the necessary image information from being removed by a signal from an external device.

Further, according to the present invention, it is possible to hold two pages of image information only by having a memory for one page of image information, for example.

[Brief description of drawings]

FIG. 1 is a sectional side view of a conventional image display device, FIG. 2 is a sectional side view of an image display device according to an embodiment of the present invention, and FIG. 3 is an external front view of the same device. FIG. 3 is a block diagram of an electric circuit of the device. 2 ... Display unit, 5 ... Scanner, 8 ... Belt-shaped photoconductor as image carrying member, 15 ... Developing device, 50 ... Memory, 54 ... Lens, 55 ... CCD as image reading means, S1 to S5 …… Operation buttons, F1, F2, F3 …… R / S flip-flops, G1, G2, G3 …… AND gates.

Claims (1)

[Claims] 1. A memory for storing image information, an image carrying member carrying a visible image corresponding to the image information from the memory or the outside, and a display for visually displaying the image carried by the image carrying member. Section, reading means for reading an image carried on the image carrying member and outputting it as image information, and image information read from the memory in response to a command to display the image information stored in the memory. A visible image corresponding to image information is carried on the image carrier and displayed on the display unit, and the image that has been displayed so far is read by the reading means, and the read image information is erased from the memory. Alternatively, a control means for storing the image information read by the reading means in the memory, Display devices.