JPH0346074A - Image display device - Google Patents

Abstract

PURPOSE:To read a display image with simplified constitution by providing a read means to unoptically read the display image. CONSTITUTION:A potential detecting means 14 as the reading means to read the display image by detecting electrification distribution on a display medium 5 is arranged at a reading part provided in the neighborhood of a roller 4. At the potential detecting means 14, a potential detecting electrode 15 to detect the potential of the display medium 5 is arranged at a state not coming in contact with the surface of the display medium 5, and potential distribution on the surface of the display medium 5 detected with the potential detecting electrode 15 is outputted to a display control circuit 12 via a potential detection circuit 16 as electrification distribution information. Therefore, the reading of the image can be performed unoptically, and an entire device can be constituted unoptically. In such a way, the reading of the display image can be performed with the simplified constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image display device that is applied to, for example, an output device of a computer, and is capable of displaying an image and reading the displayed image with a simple configuration.

(Prior Art) In recent years, as an image display device of this type, one shown in FIG. 5, for example, has been proposed. This image display device 10
0 consists of an endless strip-shaped display medium 103 wound approximately between a pair of rollers 101 and 102, and an image forming section 104 provided near one of the rollers 101, and an image forming section 104 provided near the other roller 102. Reading unit 1 that reads displayed images
05 is provided.

The display medium 103 rotates in the direction of arrow a following the roller 101 that is rotationally driven by the drive unit 106. The image forming unit 104 includes a charge applying unit 107 that applies an electric charge to the display medium 103, and a toner adhering unit 1 that applies toner to the display medium 103 charged by the charge applying unit 107.
08 is provided.

The reading unit 105 is provided with a CCD 109 as a reading means for optically reading a displayed image, and a reading unit controller 110 that controls the reading unit 105.

Further, the drive unit 106. Charge applying section 107. The toner adhesion section 108 and the reading section controller 110 are connected to a display section control circuit 111 that controls each section of the apparatus, and this display section control circuit 111 is connected to an information processing device 112 such as a personal computer or a word processor.

When displaying an image in this image display device 100, first, the information processing device 112 sends an image to the display unit control circuit 11.
1, the display control circuit 111 operates the drive unit 106 to rotate the display medium 103, and controls charge application by the charge application unit 107 based on the input image information. As a result, a latent image is formed on the display medium 103 due to charging, and the toner adhesion portion 1 is attached to this latent image.
08, a toner charged with a polarity opposite to that of the latent image is attached to form a visually visible image on the display medium 103, and this image is displayed on the display section A. After the image is displayed, the display medium 103 is freed of electrical charge by a static eliminator 113 provided near the roller 101, and the remaining toner is removed by a toner removing unit 114, and the next image is displayed as described above. It is done in the same way.

When reading the displayed image, the reading unit 10
At step 5, the displayed image is optically read by the CCD 109, and the read image information is sent to the reading unit controller 110. After being sent to the information processing device via the display control circuit 111 or being combined with image information input from the information processing device 112 in the display control circuit 111,
The image is displayed on the display medium 103 again.

(Problem to be Solved by the Invention) However, in the case of the above-mentioned prior art, a reading means that optically reads an image such as a CCD is used to read the displayed image, but such a reading means is Its properties are different from that of an image forming section that forms images non-optically. Therefore, an image display device with a reading function has a complicated configuration, and there is a problem that manufacturing, maintenance, and management become complicated.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to provide an image display device that can read displayed images with a simple configuration.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides an image display device that visually displays an image by electrostatically depositing a developer on a display medium. , further comprising a reading means for reading the image by detecting the charge distribution on the display medium.

(Function) In the device of the present invention having the above configuration, an image can be read by detecting the charge distribution on the display medium using the reading means, so it is possible to read the image non-optically. can. Therefore, since the entire device can be configured non-optically, it can be configured simply.

(Example) The present invention will be explained below based on the illustrated example. 1st
The figure is a schematic configuration diagram showing the configuration of an image display device according to an embodiment of the present invention. In the figure, ■ is an image display device connected to an information processing device 2 such as a personal computer or a word processor, and a display medium 5 is wound between rollers 3 and 4, similar to the conventional example shown in FIG. , an image forming section 8 consisting of a charge applying section 6 and a toner adhering section 7 is located near the roller 3. A static eliminating section 9 and a toner removing section 10 are provided, and a driving section 11 that rotationally drives the roller 3 is provided. Charge application section 6 and toner adhesion section 7
is connected to the display control circuit 12, and the display control circuit 12
is connected to the information processing device 2.

In the image display device 1 of this embodiment, a potential detection means 14 is provided in the reading section 13 provided near the roller 4 as a reading means for reading a display image by detecting the charge distribution on the display medium 5. is installed.

In this potential detection means 14, as shown in FIG. The resulting potential distribution on the surface of the display medium 5 is output to the display unit control circuit 12 via the potential detection circuit 16 as charge distribution information.

Further, as shown in FIG. 2, the display medium 5 includes a ground electrode 19 made of a conductive material bonded to the inner surface of an endless strip-shaped dielectric sheet 18 made of a dielectric material.
9 is grounded. In the charge application section 6, the application electrode 20 is arranged without contacting the surface of the dielectric sheet 18, and the charge generated by the applied voltage generation circuit 21 is applied onto the dielectric sheet 18 via the application electrode 20. Ru. This applied voltage generation circuit 21 is connected to the display section control circuit 12. In the static eliminating section 9, a static eliminating electrode 22 is disposed in contact with the surface of the dielectric sheet 18, and this static eliminating electrode 22
is grounded.

The operation of displaying an image and reading the displayed image in the apparatus of this embodiment configured as described above will be described below.

First, image information is sent from the information processing device 2 to the display control circuit 12, and the display control circuit 12 operates the drive unit 11 to rotate the roller 3, thereby rotating the display medium 5 in the direction of arrow a. , move to the reference position. Along with that,
The display control circuit 12 controls the applied voltage generation circuit 21 according to the input image information, and the applied voltage generation circuit 21 generates an applied voltage based on the image information. This generated voltage is applied via the application electrode 20 to a point 1 perpendicular to the direction of the arrow a of the display medium 5.
By applying it on the line, an electric field is formed between the dielectric sheet 18 and the ground electrode 19, and the dielectric sheet 1
A charge distribution based on image information is formed on one line of the 8 surface.

In this way, a latent image is formed line by line on the display medium 5 by charging, and this latent image is transferred to the toner adhering portion 7.
Toner as a developer charged with a polarity opposite to that on the surface of the display medium 5 is attached. As a result, a toner image is formed on the surface of the display medium 5, and the image is visually displayed on the display section A.

When reading this display image, the reading unit 13 detects the potential difference between the potential detection electrode 15 and the ground electrode 19 line by line as the potential on the surface of the display medium 5. Thereby, the charge distribution on the display medium 5 is detected, and this charge distribution information is digitized by the potential detection circuit 16 and then output to the display section control circuit 12. Then, image information is read by reading this charge distribution information, and this read image information is sent from the display unit control circuit 12 to the information processing equipment 2, or is input from the information processing equipment 2 to the display unit control circuit. After being combined with the image information obtained, the image information is displayed on the display medium 5 again.

Image display 1 After image reading is performed, the display medium 5 is charged with electricity by a static elimination electrode 22 in a static elimination section 9, and residual toner is removed and collected in a toner removal section 10 in preparation for the next image display. .

In the image display device 1 of the embodiment described above, since the potential detection means 14 reads the displayed image non-optically, the entire device can be constructed non-optically. Therefore, the configuration of the device is simplified, making manufacturing, maintenance, and management easier.

FIG. 3 is a configuration diagram showing the configuration of an image display device according to another embodiment of the present invention. In the figures, the same parts as in the above embodiment are denoted by the same reference numerals, and explanations thereof will be omitted.

In the image display device 30 of this embodiment, in a reading section 31 provided near the roller 4, a static elimination current detection means 34 consisting of a first static elimination electrode 32 and a static elimination current detection circuit 33 is provided as a reading means.

The first static elimination electrode 32 is disposed in contact with the surface of the display medium 5, and is grounded through an appropriate impedance. As a result, part of the electric charge on the display medium 5 is removed. The static eliminating electrode 22 provided in the static eliminating section 9 is the first static eliminating electrode 32
serves as a second static elimination electrode that removes charges remaining on the display medium 5 during static elimination. First static elimination electrode 32
The reason why all the charges are not removed is to prevent the toner from scattering on the display medium 5 from the reading section 31 to the toner discharging section 10.

In this device as well, an image is displayed in the same way as in the above embodiment, but when reading the displayed image, in the reading unit 31, the charged charges on the display medium 5 are transferred to the first charge-eliminating electrode. 32. The static electricity is partially eliminated through the resistor R, and the static elimination current at this time is detected by the static elimination current detection circuit 33.
Detected by Thereby, the charge distribution on the display medium 5 is detected, and by reading this charge distribution, the display image can be read. Therefore, the charging information detected by the static eliminating current detection circuit 33 and sent to the display unit control circuit 12 is either sent from the display unit control circuit 12 to the information processing device 2 as read image information as in the above embodiment, or Image information is synthesized in the display unit control circuit 12.

In the image display device 3o of this embodiment as well, since the display image is read non-optically by the static elimination current detection means 34,
The entire device can be constructed non-optically.

In addition, in this embodiment, as shown in FIG.
The static elimination electrode 32 may be disposed close to the upstream side of the second static elimination electrode 22 in the display medium rotation direction.

In this case, the reading section 31 will be provided near the roller 3, and by giving a reading function to a part of the static eliminating electrode of the static eliminating section and adding a static eliminating current detection circuit, there will be no need to make major changes to the hardware. , the entire device is configured non-optically, and can read displayed images and detect charging characteristics.

Incidentally, in the above embodiments shown in FIGS. 3 and 4, the charge distribution was detected by detecting the neutralization current when static charges are removed, but it is also possible to detect the potential change on the surface of the display medium during static electricity removal. The charge distribution may be detected by doing so.

(Effects of the Invention) The present invention has the above-described structure and operation, and by providing a reading means for non-optically reading the displayed image, the entire device can be made into a non-optical structure, and the structure is simple. It is possible to read the displayed image.

Therefore, there is an effect that manufacturing, maintenance, and management of the device are facilitated.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing the configuration of an image display device according to an embodiment of the present invention, FIG. 2 is a detailed configuration diagram showing the detailed configuration of the same embodiment, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a configuration diagram showing another example of the arrangement position of the first static elimination electrode in the same embodiment, and FIG. 5 is a schematic diagram showing the configuration of a conventional image display device. FIG. Explanation of symbols 1... Image display device 2... Information processing equipment 5...
-Display medium 8...image forming section 12...display section control circuit 13...reading section 14...potential detection means (
Reading means) A...Display section! Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] An image display device that visually displays an image by electrostatically depositing a developer on a display medium, wherein the image is read by detecting the charge distribution on the display medium. An image display device characterized by comprising a reading means for reading images.