JPH0444756B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device, and particularly to a display device suitable for use in devices such as image files.

Conventionally, a cathode-ray tube (hereinafter referred to as CRT) device has been generally used as a display device for displaying information converted into electrical signals.
However, CRT devices have low resolution, so e.g.
The drawback was that it was difficult to read when all pages of an A4 document were displayed on one screen.
Therefore, a high-definition display capable of high-resolution display has been proposed in Japanese Patent Application Laid-Open No. 58-98746.
An example of such a high-definition display is shown in FIG.

In FIG. 1, output light from a semiconductor laser (not shown) modulated by an image signal is scanned in one direction (perpendicular to the plane of the paper) by a scanner 5.
The back surface of a belt-shaped photoreceptor 8 is exposed through a θ lens 6 and a mirror 7. This photoreceptor 8 moves in the direction of the arrow, and is made of a polyethylene terephthalate film made conductive by providing a thin indium tin oxide film on the surface, and a resin is used as a binder on the surface.
It is coated with CdS. CdS is doped with copper and indium and is sensitive to near-infrared light emitted by a semiconductor laser. A developing device 9 is provided opposite the exposure position of the photoreceptor. The developing device is provided with a sleeve 2 having a magnet 1 therein, and the magnet 1 rotates in the direction of the arrow.

The conductive and magnetic developer (toner) 3 supplied to the surface of the sleeve 2 is uniformly regulated by the blade 4 and comes into contact with the surface of the photoreceptor 8 . Developer 3
Since the width of the region in contact with the surface of the photoreceptor is much larger than that of the laser beam, development continues even after exposure to the laser beam has ended.

A DC voltage is applied between the sleeve 2 of the developer and the base of the photoreceptor 8 by a DC voltage source (not shown). Near the position where exposure and development are performed,
Rollers 10 and 11 are provided to keep the photoreceptor 8 smooth and to maintain a constant distance between the photoreceptor surface and the sleeve of the developer with high precision.

The toner image formed on the surface of the photoreceptor at a position facing the developing device is sent to the display section 13, and the movement of the photoreceptor 8 is temporarily stopped at this position.

In the display section, the toner image on the surface of the photoreceptor can be visually observed through the glass 12.

The lamp 14 is for erasing the history of the photoreceptor, and is lit only while the photoreceptor 8 is moving.
The lights go out when the vehicle stops.

When changing the displayed content, the photoreceptor 8 is moved again and the photoreceptor having the toner image on its surface is used again.

On the other hand, as information devices become more multi-functional and complex, the functions required of display devices have also become more diverse.
For example, in the integrated file system shown in the block diagram of FIG. 2, a plurality of display devices with different functions are used.

In FIG. 2, 15 is a controller that controls the entire system, 16 is a keyboard that operates the system, and 17 is a CRT that displays input information from the keyboard 16 and other information necessary for control.
A device 18 is an optical disk file device in which image information is converted into a signal and recorded, and 19 is an optical disk file device 19 that monitors the information recorded in the optical disk file device 18 as a visible image, such as the one described in FIG. It is a high-definition display. Reference numeral 20 is a document reader using a photoelectric conversion element such as a charge-coupled device (CCD), which converts image information on a paper sheet into an electrical signal and inputs it to an optical disk file device. Make a hard copy. The laser beam printer 21 is a hard copy output device of this system, and produces hard copies of information such as the document reader 20, optical disk file device, microfilm file 22, and the like. 22 is a microfilm file, which stores a large amount of image information as microfilm, and reads the microfilm image with a well-known search device and a photoelectric conversion element such as a CCD.
It includes a microfilm scanner device that converts the signal into an electrical signal and sends it to an optical disk file device 18, a laser beam printer 21, or the like. A microfilm reader 23 serves as a monitor for the microfilm file 22, and optically projects the retrieved microfilm image onto a screen or the like.

In the above system, three different types of display devices are used depending on the required functions: a CRT device, a microfilm reader, and a high-definition display. Therefore, the operator has to view the three display screens one after another as information is input/output, resulting in poor operability. In addition, each display device requires space, making it inevitable to increase the size of the system.

An object of the present invention is to provide a compact display device that can display different types of information on the same screen.

The present invention includes a first display means that scans a display surface to form an image according to information converted into an electrical signal, and a second display means that optically projects an image onto the same display surface as the first display means. The above object is achieved by a display device comprising display means.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a schematic diagram showing essential parts of an embodiment of the display device of the present invention. Reference numeral 20 denotes a high-definition display using a photoreceptor as described in FIG. 1, and has the same configuration except that the display section 13 is slanted.
The same reference numerals are given to the same members as in Fig. 1, and detailed explanations are omitted, but as mentioned above, the display screen is scanned according to information converted into electrical signals to form an image. . Reference numeral 30 denotes a lamp whose light is condensed and refracted by condensing lenses 31, 33 and a mirror 32, and irradiates the microfilm 34. 35
is a projection lens, which forms an image of the microfilm on a charge coupled device (CCD) 37 via a mirror 36.

When the mirror 36 is used as a microfilm reader for monitoring microfilm images, it moves to the position shown by the broken line, and when it is used as a microfilm scanner for converting the microfilm image into an electrical signal, it comes to the position shown by the solid line.
The CCD 37 converts the microfilm image formed on this light-receiving surface into an electrical signal and outputs it to another information processing device (not shown) connected to this display device. Alternatively, this electrical signal is sent to the high-definition display 20 to form a display image. The high-definition display 20 also has a function of forming an image independently of the microfilm scanner in accordance with electrical signals input from an external information processing device. Incidentally, the CCD 37 is mounted so as to move up and down as shown by the arrow in the figure in order to perform sub-scanning of the microfilm image.

38 is an attachment lens, and lens 3
The image passing through the mirror 39 is further enlarged and projected onto the display section 13 of the soft display via the mirror 39. 40 is a lighting lamp such as a fluorescent light;
The device is controlled to turn on when used as a high-definition display, and turn off when used as a microfilm reader and microfilm scanner.

Further, the lamp 30 is controlled so that it is turned off when used as a high-definition display, and turned on when used as a microfilm reader and microfilm scanner.

The display device of this embodiment is actually connected to a microfilm retrieval device (not shown), and the microfilm 34 is supplied from this retrieval device. The form of the microfilm used may be 16mm or 35mm roll film, microfissure, or aperture card, and if the desired microfilm is searched and placed at the position shown in Figure 3 by the search device, good.

In the above embodiment, it is also possible to configure the mirror 36 to be a half mirror so that the microfilm image is converted into an electrical signal by a scanner while being monitored, and the microfilm image is not projected onto the display unit 13 during the search. A shutter may be provided between the microfilm 34 and the lens 38. Although the CCD 37 has been explained using a licensor type CCD, it goes without saying that an area sensor type CCD can also be used. At this time, there is no need for sub-scanning to move the CCD. Further, if a material such as titanium oxide is coated on the surface of the photoreceptor 8 of a high-definition display, a display surface that is easier to see can be obtained.

FIG. 5 shows an example in which the display device of the present invention is incorporated into the aforementioned integrated file system. In Fig. 5, the same parts as in Fig. 2 are given the same reference numerals.
Detailed explanation will be omitted. Here, the display device 41 of the present invention forms an image on the display surface in accordance with electrical signals input from the optical disk file device 18 or the document reader 20 via the controller 15. When monitoring the information stored in the microfilm file 22, the display device 41
The microfilm image is optically projected onto the same display surface as above. If the display device of the present invention is used in this way, the display surface will be reduced by one area, and the operator will not be able to view the high-definition display 19 or use the microfilm reader 2 as in the conventional example shown in FIG.
3, which has a great effect on increasing the usability of the system. Additionally, the entire system can be configured compactly.

In the embodiments described above, an electrostatic photographic high-definition display was used as a means for displaying information converted into electrical signals, but other display means may also be used. Examples of these are shown in Figures 5-7.

The image display device shown in FIG. 5 forms a visible image on a heat-sensitive display sheet 42 using a thermal head 43. The visible image is then erased by the cooling unit 44. 45 is a screen, and 46 is a protection plate.

The image display device shown in FIG. 6 attaches transparent droplets 49 from a droplet discharge means 48 to a display sheet 47 having a diffusion surface on the back surface in accordance with an image signal.
The image is made visible by the light that passes through it. 50 is a transparent liquid tank, 51 is a screen,
52 is a protection plate.

The image display device shown in FIG. 7 uses an applicator 53 to apply a transparent liquid from a tank 50 over the entire surface of a display sheet 47 having a diffusion surface on the back surface, and leaves the transparent liquid in accordance with an image signal, leaving other parts. The transparent liquid is removed by a thermal head 54, and an image is made visible by the light passing through the transparent liquid. By providing means for optically projecting an image onto the display sheet 42 or 47 of these display means, the display device of the present invention is constructed in the same manner as in the previous embodiments. Further, the display means for projecting images is not limited to the microfilm reader of the embodiment, and various devices such as a video projector can be used.

The display device of the present invention can be used in almost any device that needs to display a plurality of pieces of information in different formats, in addition to the above-mentioned integrated file system. At this time, there are various display modes, and in addition to switching between display using electrical signals and display using projection, it is also possible to create a display image by using these display means in a complementary manner. For example, it can be used in an educational system to write out information input by the user, such as answers to the assignments, on a surface that displays fixed information such as assignments. Other
Use it for CAD (Computer aided design) to project the coordinate system onto the display surface, or use it as shown in Figure 4 to display the range where hard copies can be made on the display surface when used as a microfilm reader. etc., its applications are very wide.

As explained above, the display device of the present invention can (1) reduce the number of display surfaces in information equipment and save space; (2) improve the operability of information equipment; and (3) allow different forms of display means to be used. By using them simultaneously, it has effects such as being able to form a composite image that has not been possible until now.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of a conventional high-definition display, FIG. 2 is a block diagram showing the configuration of a conventional integrated file system, and FIG. 3 is a schematic diagram showing an embodiment of the display device of the present invention. FIG. 4 is a block diagram showing the configuration of an integrated file system using the display device of the present invention, and FIGS. 5, 6, and 7 are schematic diagrams illustrating display means applicable to the present invention. be. 13...Display surface, 24...High-definition display, 3
0... Lamp, 31, 33... Condensing lens, 32, 3
6, 39...mirror, 34...microfilm, 3
5... Projection lens, 37... Charge coupled device, 38... Attachment lens, 40... Illumination lamp.

Claims (1)

[Claims] 1. A first display means that scans a display surface to form an image according to information converted into an electrical signal, and a second display means that optically projects an image onto the same display surface as the first display means. A display device consisting of.