JPS6116675A - Image display device - Google Patents

Abstract

PURPOSE:To receive new image information while a necessary display image is displayed by providing a memory and a control means which make a selection as to whether image information from an external device is held on an image carrier member as a visual image or stored in the memory. CONSTITUTION:An operation button S1 or S2 is operated to inhibit or allow the input of an image information input start signal DST through a flip-flop F and an AND gate G1, and an operation button S3 or S4 is operated to make a selection as to whether the input image information is displayed when necessary or stored in the memory 50. Further, when an operation button S5 is turned on, the output Q of the flip-flop F3 goes up to a level ''High'' and a display driving circuit 62, memory driving circuit 63, and CCD driving circuit 64 are all driven to transfer image information stored in the memory 50 to a laser driving circuit 65 and display it as a visual image; and image information which is already read by a CCD55 and displayed is stored in the memory 50 through an image processing circuit 66.

Description

DETAILED DESCRIPTION OF THE INVENTION [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 visual image.

[Prior art]

Traditionally, CRT (cathode ray tube) has been used as this type of display device.
However, as an alternative to such image display devices, the applicant has developed and proposed an image display device using an endless belt-like image carrying member.

A side sectional view of this image display device is shown in FIG. 1. In FIG. 1, guide rolls 9, 10.
An endless belt-like photoreceptor 8 (hereinafter referred to as belt-like photoreceptor) as an image carrier is guided by 1 and 12 and intermittently driven by a driving means (not shown), and is modulated by an image electric signal. The output light of a semiconductor laser (not shown) is scanned in one direction by a scanner 5, and the back surface of the belt-shaped photoreceptor 8 is exposed through an f-theta lens 6 and a mirror 7.

The photoreceptor 8 is, for example, a transparent conductive substrate on which a photoconductive layer is provided.

A sleeve 1 that faces the surface of the belt-shaped photoreceptor 8 at the exposure position A and has a magnet 18 that rotates in the direction of the arrow in the figure.
A developer 15 having conductive and magnetic properties supplied to the sleeve surface is uniformly regulated by the blade 18 and comes into contact with the photoreceptor surface. A DC voltage is applied between the sleeve 17 of the developing device 15 and the base of the photoreceptor by a DC voltage source (not shown), and rollers 13 and 14 are provided near the positions where exposure and development are performed. As a result, the belt-shaped photoreceptor 8 is kept flat and the distance between the surface of the photoreceptor and the sleeve of the developing device is kept constant with high precision. The toner image written and formed on the surface of the belt-shaped photoreceptor by beam light irradiation at position A facing the developing device 15 is sent to the display section 2.

The display section 2 is configured such that a rectangular window hole 3 is provided on the front surface of a housing 1, and the toner image on the photoreceptor can be viewed directly from the outside through a transparent member 4 that covers the window hole 3.

The photoreceptor 8 can be stopped for an arbitrary period of time automatically or by operating a switch when a predetermined visible image area coincides with the position of the window hole 3. Thus, the window hole 3
The toner image on the surface of the photoreceptor can be visually observed through the transparent member 4. Note that the lamp 20 is for erasing the history of the photoreceptor, and is turned on as necessary only while the belt-shaped photoreceptor is moving, and is turned off when the belt-shaped photoreceptor is stopped.

The image forming method of this device is disclosed in Japanese Patent Application Laid-Open No. 58-987.
48 or Japanese Patent Application Laid-open No. 58-9111748, image display devices such as 0 or more that can use the method disclosed in Japanese Patent Application Laid-open No. 58-9111748 input image information converted into an electric signal from the outside, and display the image information according to the electric signal. Since the image is displayed as a microscopic image, a memory circuit is generally used to store and store image information converted into electrical signals, or a memory circuit is used to replayably record the image information on an information recording medium (for example, an optical disk). It is used by being electrically connected to an external device such as an information recording device (for example, an optical disk device).

Further, in many cases, a system controller or the like as a control device for instructing and controlling information transfer operations between these information recording devices or memory circuits and the image display device is connected between the two.

Furthermore, with the development of information transfer technology, communication technology, etc., the main frame is an information recording medium or memory circuit that stores or stores image information, a control device such as a system controller, and an image display device is used as a terminal device. By configuring an information processing system, it is possible to operate an image display device located at a physically distant location by a control device such as a system controller in a main frame.

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 person viewing the image display device may be different, so the following Inconveniences as shown will occur.

That is, when the viewer of the image display device is viewing the displayed image, if the mainframe control device operator performs a display image update operation to display a new image on the display section of the image display device, the above-mentioned This has the disadvantage that a different image is displayed even though the viewer is viewing the image, and the image that the viewer was currently viewing is no longer visible on the display unit.

Furthermore, in order to display the image that was currently being viewed, it is necessary to search for image information again from an external device and input it to the image display device, which has the disadvantage of complicating the operation.

In addition, especially when attempting to visually check two images by referring to them alternately, it is necessary to search for image information from an external device and input it from the external device each time the need for reference arises. The process becomes extremely complicated, resulting in a decrease in work efficiency.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide an image display that allows images that are being viewed by a viewer or that need to be further displayed to be maintained on a display unit without being updated from the outside. The goal is to provide equipment.

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

Still another object of the present invention is to provide an image display device that simplifies the operation of alternately referring to two images and has good operability.

〔Example〕

Hereinafter, the present invention will be explained 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, with FIG. 2 being a side sectional view and FIG. 3 being an external front view.

In FIGS. 2 and 3, all members having the same reference numerals as those in FIG. 1 have the same functions, so their explanations will be omitted.

A memory 50 is provided within the housing 1, and the memory 50 has a storage capacity capable of storing image information for one page of images.

Further, an interface 51 is provided for signal communication with an external device.

Above the device is an illumination lamp 52. Mirror 53. lens 5
4 and a CCD 55 are arranged as image reading means, and the light emitted from the illumination lamp 52 is irradiated onto the belt-shaped photoreceptor 8, and the reflected light image is formed on the CCD 55 by the lens 54 via the mirror 53. be done. Therefore, by moving the belt-shaped photoreceptor 8 in the direction C in the figure, the image carried by the belt-shaped photoreceptor 8 and displayed on the display section 2 is read by the COD 55, and the image information is converted into an electrical signal. I can do it.

An operating section 5e is provided below the display section 2. Five operating buttons 81 to S5 and two lamps L1 and L2 are arranged on this operating section 5B.

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

The operation button S2 is a switch that cancels the input prohibition state and allows input of image information from an external device to the image display device. When this operation button S2 is pressed, the lamp L
! goes out.

The operation button S3 is a switch for displaying the image information on the display unit 2 as a visible image when image information is input from an external device to the image display device.

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

The operation button S5 is a switch for exchanging the image information displayed on the display section 2 with the image information stored in the memory 50. When the operation button S5 is pressed, the image information stored in the memory 50 is changed. The obtained image information is carried and displayed as a visible image on the belt-shaped photoreceptor 8, and
The image information that has been displayed up to that point is read by the CCD 55, converted into an electrical signal, and stored 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, 6o and 81 are lamp drive circuits for driving the lamps Ll and L2, respectively, and 62 is a lamp drive circuit for driving the belt-shaped photoreceptor 8 of the image display device, the scanner 5, etc. to perform an image display operation. display drive circuit for, 83
is a memory drive circuit for driving the memory 50, and 64 is a COD drive circuit for driving the CCD 55. Further, 85 is a laser drive circuit for modulating the laser according to the input image information signal, and G6 is an A/C converting the image information read by the CCII 55 and converted into an analog electrical signal into a digital signal. This is an image processing circuit for performing image processing such as D conversion and dither processing.

F1 to F3 are R/S flip-flops, 01 to G3 are A
NI) gate.

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

When operation button S1 is turned on, flip flow, pu F1
is set, the output Q goes to old gh, and the output goes to low. When the output Q of the flip-flop F1 becomes old gh, the lamp drive circuit 80 is driven, and the lamp L1 lights up, indicating that image information input is prohibited. In addition, an image information input prohibition signal I is sent via the interface 51.
HBT is output to an external device. Furthermore, by turning the output enable of flip-flop F1 Low, DST
Even if the signal is input, the image display device does not proceed beyond the AND gate (Gl), so 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, and the output Q is set to Low and output enabled is set to High.
become. Therefore, the lamp drive circuit BO stops driving the lamp L1, and the lamp L1 goes out.

Further, the IHBT signal is no longer output. Furthermore, D.S.
? When a signal is input, the DS
The T signal can pass through the AND gate) Gl. In this way, by operating the operation buttons S1 and G2, input of the image information input start signal DST can be prohibited or permitted as necessary.

The DST signal that has passed through AND gate G1 is input to AND gates G2 and G3. Here, operation button S3
is ON, the flip-flop F2 is set and the output Q becomes High and the output Q becomes Low.
Therefore, the signal is input to the display drive circuit 82 but not to the memory drive circuit 83. Further, the VIDEO signal is input to the display drive circuit 62 and the memory drive circuit 83, and the display drive circuit 82 is driven by the DST signal.

The memory drive circuit 63 is O5? Since no signal is input, the image display device performs a predetermined image display operation, but the contents of the memory 50 do not change. Furthermore, since the output enable of flip-flop F2 is Low,
The lamp drive circuit 81 does not work and the lamp L2 does not light up.

. 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 enable becomes the old gh, so the lamp drive circuit 81 is driven and the lamp L2 is lit. Furthermore, the DST signal that has passed through the AND gate Gl is processed by AND gates G2 and G3.
It is input to the memory drive circuit 63, but the display drive circuit 6
Therefore, the image display device does not perform an image display operation, and all input VIDEO signals are input to the memory 50 by the memory drive circuit B3.

In this way, the image information input by operating the operation buttons S3 and G4 can be displayed as necessary, or
Alternatively, it is possible to select whether 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 the old gh. Therefore, all of the display drive circuit 82, memory drive circuit 63, and 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 microscopic image. .

On the other hand, the already displayed image information read by the CGII 55 is transferred to the memory 50 via the image processing circuit 86.
stored within. Therefore, by turning on the operation button S5, the displayed image information and the memory 50
You can replace the image information stored in the

Note that when the above operation is completed, the memory drive circuit e
3 outputs a signal to the reset terminal of flip 70 knob F3, and the flip-flop F3 is reset by the action of NOT game) G4. Stop that operation.

〔effect〕

As explained above, according to the present invention, the image information stored in the memory and the displayed image information can be exchanged, and the task of visually viewing the two screens while alternately referring to them is a simple operation. This can be done by

Further, according to the present invention, new image information can be accepted while the necessary screen image is displayed on the display section.

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

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

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventional image display device, FIG. 2 is a side sectional view of an image display device according to an embodiment of the present invention, FIG. 3 is an external front view of the device, and FIG. The figure is a block diagram of the electrical circuit of the device. 2... Display section, 5... Scanner, 8... Belt-shaped photoreceptor which is an image bearing member, 15...
・Ri a′ rise 50... Memory, 54... Lens, 55... Image reading means C[? D, S1-S5・
...Operation buttons, Fl, F2, F3...R/S flip-flop,
Gl, G2. G3...AND gate. , Fig. 1 Fig. 2 S3 Fig. 3 ゛

Claims (1)

[Scope of Claims] 1) A memory capable of accumulating and storing image information, an image carrying member carrying a visual image corresponding to the image information from the memory or an external device, and an image carried by the image carrying member. a display section for visually displaying image information; and a control means for selecting whether image information from an external device is to be carried as a visible image on the image carrying member or to be stored in the memory. An image display device characterized by: 2) In the image display device according to claim 1, the control means includes an image reading means for reading the image carried by the image carrying member and converting it into an electrical signal as image information, and an image reading means for reading the image carried by the image carrying member and converting it into an electrical signal as image information; An image display device comprising means for causing the image carrying member to carry an image corresponding to the information and for storing the image information read by the image reading means in the memory. 3) The image display apparatus according to claim 1, wherein the control means includes a prohibition means for prohibiting input of image information from the external device.