JPS61193184A - Image display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] flaming bean■ The present invention relates to an image display device, particularly an image display device in which non-transparent fine particles are attached to the surface of an image carrier (display plate) to form and display an image. be.

jLL! L Week Conventional 1 An image that reproduces and displays as a visible image, for example, electrical image information that is calculated or read out from a computer or image reading device, or image information that is stored on magnetic tape or microfilm as a soft copy. Display devices, or image display devices attached to image forming equipment such as copying machines and office automension devices for image monitoring, include CRTs, liquid crystal display devices, plasma display devices, and other devices that do not have moving parts and are electrically operated. Mainly used are devices operated by However, all of these devices have low resolution and
Furthermore, is it not suitable for displaying documents with high image density?
Since there is no storage function in one display area except for special ones such as IJ stacking tubes, there is a drawback that if you want to continue displaying the same image, you must prepare a large capacity memory and read it out continuously. . Another disadvantage is that the eyes tend to get tired due to flickering of the image.

In order to eliminate the first drawback, there has been an attempt to use the means used for creating hard copies as an image display device. - For example, there is a method using a heat-sensitive coloring material that can be used repeatedly.

However, this has drawbacks such as slow recording speed, time required to display the entire screen, and difficulty in color display. Another example uses electrophotography. However, among these methods, methods using photoreceptors cannot avoid variations in polarity due to environmental changes such as temperature and humidity, and deterioration due to repeated use, resulting in poor image display stability. Furthermore, in order to perform color display, an image is formed for each color and the images are superimposed, which has the disadvantage of complicating the apparatus.

Foresight 11 An object of the present invention is to provide an electrostatic recording type image display device that displays images at high speed and always operates stably without being affected by the environment.

According to the present invention, an insulating display board, a recording electrode having a large number of recording electrode members disposed close to one side of the display board, and a structure in which the display board and the recording electrode are arranged relative to each other. (1) means for supplying non-light-transmitting fine particles to the other side of the display plate; and a means for attaching non-light-transparent fine particles in an image-like manner to the surface of the image display apparatus. be done.

Support 11 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of an image display device according to an embodiment of the present invention. A transparent protection plate 3 such as a glass plate is provided.

An endless belt 4, which is a display plate made of an insulating material, is provided inside the housing 1, and the display belt 4 is connected to the housing 1.
In this embodiment, the lower roller 5 is used as a driving roller and is rotationally driven in the direction of the arrow. do. The belt portion between the upper roller 8 and the lower roller 5 extends along the image display window 2, and the 1 display belt 4
As the image display window 2 is rotated, the image display window 2 is moved from the lower side to the north side in the figure.

At the bottom of the housing l, a toner container 9 is disposed and a conductive sleeve 11 is provided, and a rotatable rotating magnet 12 is provided inside the sleeve 11. The zero rotation magnet 12 has a large number of magnetic poles. When the zero-rotation magnet 12, in which toner is stored outside the sleeve 11 inside the toner container 9, rotates in the direction of the arrow, the toner is transported on the surface of the toner container 9 in a direction opposite to the direction of rotation of the rotating magnet 12. Ru.

A doctor blade 10 is provided on the toner outlet side of the toner container 9, and has the function of making the thickness of the toner layer conveyed on the surface of the sleeve 11 uniform. In this embodiment, the sleeve 11 is fixed.

Due to the rotation of the rotating magnet 12, the toner on the sleeve 11 reaches the image forming section where the sleeve 11 faces the surface of the display belt 4.

On the opposite side of the display belt 4, a recording electrode 18 is arranged facing the sleeve 11.

As best shown in FIG. 2, recording electrode 18 is connected to first electrode 13. It has a first dielectric 14 and a second electrode 15, and the first dielectric 14 is sandwiched between the first electrode 13 and the second electrode 15. A portion of the second electrode 15 corresponding to the first electrode 13 is formed as an opening. A second dielectric 16 and a third electrode 17 are provided in this order on the side of the second electrode 15 opposite to the first dielectric 14, and the second dielectric 16 and the third electrode 17 are provided in the opening of the second electrode 15. It has a corresponding opening. The recording electrode 18 extends over the entire width direction of the display belt 4, and therefore the first 'electrode 1
3. 1st. The J electric body 14 extends across the width direction of the display belt 4. The opening of the second electrode 15 corresponds to one dot of a pixel, and a large number of openings are provided across the width direction of the display belt 4. The second electrode 8i15 is made up of as many independent electrode groups as there are apertures, and a signal voltage corresponding to an image or a character is applied to each electrode from the image signal generator 23.

An alternating voltage is applied between the first dielectric 13 and the second electrode 15 by the alternating piezoelectric 1[22, and as a result, a creeping discharge occurs near the surface of the first dielectric 14 in the opening of the second electrode 15. , positive ions and negative ions are generated inside the opening. At this time, the bias power supply 24 (DC power supply in this embodiment) is controlled so that only ions of either polarity are directed toward the display belt 4, and only when a signal is applied from the image signal generator 23, Ions of one polarity flow towards the display belt 4 and adhere to it. The principle of this ion generation and movement mechanism is, for example, published in Japanese Patent Application Laid-Open No. 54-7
Since it is explained in detail in the specification of No. 8134, detailed explanation will be omitted here.

Here, the thickness of the fill electric body 14 is related to the output voltage of the alternating voltage power supply 22, and the thinner it is, the lower the applied voltage will be.In this embodiment, 40 colors of mica are used, and the alternating voltage TL
The output voltage of s22 was 2.0 KV (peak voltage) and a frequency of 800 KHz. The thickness of the second dielectric 16 is related to the diameter of the aperture, and when the ratio of the thickness of the dielectric 7 to the diameter of the aperture is approximately l21, the difference in signal voltage application from the image signal generator 15 can be kept low. 0 In this example, the thickness is 10
0 pots of ceramic material were used, and the opening was 100 IL. As this material, an insulator such as mica, glass, or a polymer resin such as polyimide can be used. 1st
Electrode 13. The second electrode 15 and the third electrode 17 are each 2o
It was formed from p-thick stainless steel foil.

The operation of the image display device of this embodiment will be described below.

As explained in FIG. 2, when a signal voltage corresponding to one image pattern is applied by the image signal generator 23, ions adhere to the inner surface of the display belt 4 in an image pattern. As a result, an electric charge with a polarity opposite to that of the ions is applied to the sleeve 11.
The electrostatic attraction between these charged particles causes the toner to be attracted to and adhere to the display belt 4, forming a visible toner image. During this time, the display belt 4 moves continuously, and the toner images sequentially formed on the surface of the display belt 4 reach the image display window 2, and move there from the bottom to the top until a predetermined image range is displayed on the image display window 2. When the display belt 4 moves until it appears, the movement of the display belt 4 is stopped automatically or by manual operation. Thereby, the image forming portion on the outer surface of the display belt 4 can be clearly observed from the image display window 2 as a transmission type image by the illumination light of the illumination means consisting of the plurality of illumination lamps 20 and the reflection plate 21.

Display belt 4 after a predetermined period of time or manually
The display belt 4 rotates again by the re-rotation command operation, and a display image of the tsuza formed in the same manner as above is displayed on the image display window 2.
When located at , the 1 display belt 4 stops again and an image is displayed. Thereafter, this cycle is repeated, and the amount of toner adhering to the outer surface of the 0 display belt 4, where images are displayed one after another, increases or decreases depending on the level of the voltage applied to the second electrode 15, so that images of intermediate density can also be faithfully reproduced. 6 After completion of the display, the toner image returns to the image forming section with the rotation of the display belt 4.
There, the toner is wiped out by contact with the toner on the sleeve 11, mixes with the toner sent over the sleeve 11 from the toner container 9, and is used for forming a new toner image, or is collected into the toner container 9. be done. Therefore, it will not appear as a ghost image in the previous displayed image or the next image.If necessary, for example, the image may be displayed by AC corona discharge or the like before the toner is returned to the storage container 9 from the side to which the toner is attached. The display belt 4 has moved once by eliminating the charge on the surface of the belt 4.
The erasure of the toner image on the surface becomes more complete.

As described above, the toner of the displayed image is mixed with the toner on the sleeve 11 and used for the next image formation, or it is returned to the toner storage container 9 so that the toner is repeatedly used for image formation. .

Therefore, the toner in the toner storage container 9 is not substantially consumed, and maintenance such as toner replenishment is not required.

In Example L, the distance between the third electrode 17 and the display belt 4 is 0.1 mm, and the display belt 4 has a thickness of 2 mm.
A 51L polyester film was used. As the toner, it is preferable to use a conductive magnetic toner having a resistance value of 19100 cm or less. In this example, a conductive toner manufactured by Tomegawa Paper Industries Co., Ltd. was used.

The display belt 4 was moved in the direction of the arrow at 100 mm/sec. 1 to the second electrode 15 by an image signal generator 23.
A voltage of 1,900 V was applied as an image signal, and a voltage of 1,700 V was applied when there was no image signal. A voltage of -800V is applied to the third electrode 17 by a bias voltage [24].
On the other hand, the sleeve 11 was grounded.

Next, other embodiments of the present invention will be described.

This embodiment is capable of displaying color images.
In this embodiment, as shown in FIG. 3, the display belt 4 has a single layer of multicolor filters in the form of narrow stripes extending in the circumferential direction of the belt. That is, in this embodiment, three red filter layers 4R14G and 4B, which are the three primary colors of the additive color method, red, green, and blue, are arranged densely in the width direction of the display belt 4 as a repeating unit. .

Such a multicolor filter layer 41 can be formed, for example, by a printing method using non-transparent color ink. The apertures of the second dielectric 16 and the third electrode 17 are arranged so as to correspond to the respective stripes of the multicolor filter layer 41.When viewed as a whole, the outer surface of the 0 display belt 4 is By mixing the three primary colors of the color system, it is perceived as white or grayish-white.

Then, for a certain part of the outer surface of the display belt 4, non-transparent fine particles (black) are selectively applied to a part of the filter of each color in that part.
1 When the part of the display belt 4 is attached, it is recognized as the color of the filter other than the part hidden by the toner, or the mixed color of the remaining two colors 6 For example, except for the red filter layer 4R, the other green filters If the first layer 4G and the blue filter first layer 4B are hidden by toner adhesion, those parts will be recognized as red, or the blue filter fi4B will be recognized as red.
When toner is applied only to the remaining red and green red filter layer 4R and green filter layer 4G, that portion is perceived as yellow due to the mixed color.

A voltage is selectively applied to the individual electrodes of the electrode group of the second electrode 15 in accordance with the time-series pixel signals of the color image to be displayed, and a portion of the unnecessary filter on the outer surface of the display belt 4 is selected. A translucent color image is formed on the surface of the display belt 4 by hiding it with toner adhesion, and is displayed and recognized through the image display window 2. In case of color display,
If the positional relationship between a part of each striped filter on the display belt 4 and the corresponding individual part shifts, a different color will appear, so the lower roller 5 and the like are designed to prevent the display belt 4 from shifting in the width direction. ing. For the same purpose, it is preferable that the display belt 4 and the support for the recording electrode 18 have similar coefficients of thermal expansion.

FIG. 4 shows another embodiment of the present invention, in which an illumination lamp 20 and a fourth electrode 26 are installed between the third electrode 17 and the display belt 4 as shown. Then, the fourth electrode 26 and the sleeve 1
By making the potentials of the electrodes 1 and 1 approximately the same, the electric field generated from the third electrode 17 can be canceled out, thereby preventing unnecessary toner from adhering to the display belt 4.

In the embodiment shown in FIGS. 3 and 4, the parts other than those described above are the same as the embodiment shown in FIG. 1, and detailed explanations thereof will be omitted.

In the above description, in order to simplify the explanation, the apertures of the recording electrodes 18 are set in one row, but in each embodiment, in order to improve the pixel density, two or more rows are arranged in a staggered or zigzag arrangement. The combined driving of the first electrode 13 and the second electrode 15 may be performed by time-series division. This method is described in detail in, for example, Japanese Patent Application Laid-open No. 54-53537, so a detailed explanation will be omitted. do.

Further, in the above description, the illumination is of a translucent type, but if color display is not intended, the display belt 4 may be white and reflective illumination may be used to display one image.

Furthermore, other variations of the image forming method are possible in addition to the exemplified method. 1. For example, an image display belt and a group of signal electrodes are provided in close proximity to the image display belt, and toner is further applied to the side opposite to the signal electrodes via the belt. Any method can be used as long as the toner is supplied and the signal voltage F is applied in an imagewise manner to cause the toner to adhere to the image display belt.

As described above, according to the embodiments of the present invention, since it is an electrostatic recording method, images can be displayed at high speed, and since a photoreceptor is not required, stable operation is always performed without being influenced by the environment, and color display is possible. is also possible.

In general, according to the embodiments of the present invention, an electrostatic recording type display device that does not use a photoreceptor is provided, so that it is excellent in stability. Furthermore, in the present invention, an image-shaped charge is attached to the side opposite to the display surface of the image display belt, so that the recording head is not contaminated, and the image display belt is made translucent to provide a transmission type display device. In some cases, this has the effect of facilitating optical contrast display and color display.

Furthermore, it has the advantage that the formed image can be easily erased, and there is no consumption of recording electrodes.

Furthermore, recording with gradation is also possible.

According to the present invention, there is provided an electrostatic recording type image display device that displays images at high speed and always operates stably without being affected by the environment.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an image display device according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing the configuration of a recording position. FIG. 3 is an enlarged view of an image display belt used in another embodiment of the present invention, and FIG. 4 is an enlarged sectional view showing the configuration of a recording head used in still another embodiment of the present invention. Explanation of symbols 2, image display window 4, display belt 5, lower roller 9, toner container No. 1 Fig. 2 Fig. 3 Top

Claims (1)

[Scope of Claims] An insulating display plate, a recording electrode having a large number of recording electrode members disposed close to one side of the display plate, and relatively moving the display plate and the recording electrode. means for supplying non-light-transmitting fine particles to the other side of the display plate; and means for applying a signal to the recording electrode corresponding to an image to be displayed to display the image on the other side of the display plate; An image display device comprising: means for attaching non-transparent fine particles in a shape.