JPH11272199A - Color display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily display a color still image on a large display surface at low cost without requiring a large space. SOLUTION: Between a take-up roller 102a and a payoff roller 102b, a color filter 104 is arranged closely to and opposite the reverse surface viewed from the display surface of a transparent film 101, and between this color filter 104 and payoff roller 102b, a recording part 106 consisting of a multistylus electrode is arranged. Further, a developing unit 107 is arranged between the recording part 106 and color filter 104.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color display device for displaying a color still image.

[0002]

2. Description of the Related Art As a display device capable of displaying a still image with a large display area used for a presentation or the like,
A system using a liquid crystal projector is known. This liquid crystal projector is configured to project light from a light source via a liquid crystal panel. Then, the projected light image (image) is projected on a predetermined screen or the like, so that display is performed. Then, by supplying an image signal to the liquid crystal panel and forming an image thereon, an image corresponding to the image signal is displayed on the screen. On the other hand, based on the image signal, a soft fax that forms and displays an image on the display surface depending on the presence or absence of toner, and after a certain period of time, scrapes the toner that has formed the image, erases the image, and reuses the toner, is there. In this method, a latent image (development) of an image signal is formed on a medium serving as a display surface by an electrostatic method, a toner is attached to the portion to form a visible image, and the toner image is physically taken to form an image repeatedly. Has the features that can be.

[0003]

However, in the display using the liquid crystal projector, since the reflected light projected on the screen is viewed, an image projected on the screen is difficult to be identified if the surroundings are bright. There is a problem and the surroundings need to be as dark as possible. Also,
In this method, it is necessary to project the light image projected from the liquid crystal projector on a screen arranged at a certain distance, so that a certain space is required. On the other hand, in the case of soft faxing, when colorization is performed by this method, it is necessary to provide a developing device and a scraping mechanism (toner collecting mechanism) for each color, which is complicated and expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can display a color still image on a large display surface more easily and inexpensively without requiring a large space. The purpose is to be able to.

[0005]

According to the present invention, there is provided a color display apparatus comprising: a transparent film; film moving means for moving the transparent film in a predetermined direction; and a static film for forming a latent image by electrostatic charge on one surface of the transparent film. A charge recording unit, a developing unit disposed after the electrostatic charge recording unit in the moving direction of the transparent film, and a developing unit for attaching toner to a latent image due to an electrostatic charge formed on one surface of the transparent film; and a developing unit in the moving direction of the transparent film. And a color filter disposed on one surface side of the transparent film after the developing means. Therefore, a color display is performed by an image formed by one color toner.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a configuration of a color display device according to an embodiment of the present invention. In this color display device, first, the transparent film 101 is held in a state where a predetermined tension is applied between the take-up roller 102a and the feed roller 102b, and the take-up roller 102a is rotated by the driving unit 103. Thus, the transparent film 101 travels in the direction of arrow A in the figure. The transparent film 101 has a configuration in which, for example, a dielectric layer (insulating layer) having a thickness of about 20 μm and a grounding layer having a thickness of several μm including a transparent electrode or the like are formed on a PET (polyethylene terephthalate) film. I have. The ground layer is exposed at the end of the transparent film 101 and is grounded.
The charge storage capacity of the surface on which the dielectric layer is formed, which is the recording surface, is increased.

As shown in FIG. 1, a color filter 104 is disposed between the take-up roller 102a and the feed-out roller 102b so as to be close to the back surface of the transparent film 101 as viewed from the display surface and to face the same. Have been. The color filter 104 has a stripe shape extending in a direction perpendicular to the running direction of the transparent film 101. A filter that selectively transmits red (R), blue (B), and green (G) light has a predetermined stripe width,
The plurality is formed alternately. That is, one third of the size of the pixels constituting the still image displayed by the color display device may be set as the stripe width.

In this manner, one pixel is composed of R, G, and B in the stripe width direction. A backlight 105 is disposed on the surface of the color filter 104 opposite to the transparent film 101. The illumination light of the backlight 105 transmits through the color filter 104, and the transmitted light is reflected on the transparent film 101 and can be viewed from the display surface side. That is, the area of the color filter 104 becomes a display area of the color display device.

A recording section 106 composed of a multi-stylus electrode is disposed between the color filter 104 and the feed roller 102b. A developing device 107 is provided between the recording unit 106 and the color filter 104.
Is arranged. Then, the signal circuit 108 controls the recording unit 1
The main scanning is performed by controlling 06, and the sub-scanning is performed by controlling the driving unit 103 by the signal circuit 108. As a result, an electrostatic charge is applied to a predetermined area of the transparent film 101 based on an image signal provided from the signal circuit 108. The location where the electrostatic charge is applied is the developing device 10
After passing through the location 7, the toner 109 adheres there. After passing through the display area, the toner 109 is removed from the transparent film 101 by the toner removing unit 110.

In the above configuration, if the signal circuit 108 controls the recording unit 106 to form an image (latent image) by electrostatic charge on the transparent film 101 in accordance with the displayed image, the signal is adjusted in accordance with the latent image. Then, the toner 109 adheres by the developing device 107, and a toner image is formed by the toner 109. When the area of the transparent film 101 where the toner image is formed is arranged on the display area,
Of the illumination light of the backlight 105 that has passed through the color filter 104, a portion without a toner image is visualized. In addition, a portion where the toner image is present does not transmit light and appears black. At this time, if a latent image is formed in consideration of the configuration of the color filter 104, color display can be performed in the display area.

Hereinafter, the display in this embodiment will be described in more detail. First, the color filter 104, the recording unit 106, and the developing unit 107 will be described. As shown in the plan view of FIG.
G and B are regularly and repeatedly formed. If the width of the stripe is S, the resolution is (1 inch / 3S) dpi when the color filter 104 is used. On the other hand, the recording unit 106 is a multi-stylus electrode in which a plurality of needle-like dot electrodes 106 a are arranged in parallel to the stripe direction of the color filter 104. By the dot electrode 106a, an electrostatic charge is given on the transparent film 101 in a dot shape.

In this embodiment, the size of the surface of the dot electrode 106a to which positive charges are applied is smaller than half the stripe width S of the color filter 104. Then, the dot electrodes 106a were arranged at a pitch D which is half of S and parallel to the stripe direction of the color filter 104. Therefore, the formed toner image is composed of a plurality of minute dots. In this embodiment, if one pixel in the display is a square and the size of one side is a stripe width of three R, G, and B of the color filter 104,
One pixel has a size of 6 × 6 = 36 dots.

Here, since the size of the dot electrode 106a is set to half of S, as described below,
In one pixel including R, G, and B, it is possible to give each color expression a gradation. For example, as shown in FIG. 3A, at a certain position that is the position of R on the color filter 107 (FIG. 1), a distance S (= 2 ×
The main scanning for forming the toner image is performed twice while the sub-scanning is performed only for D). In other words, the main scanning for forming the toner image is performed twice at intervals of 3S in the sub-scanning direction and for the distance S in the sub-scanning direction. In addition, in a certain position serving as another R position, main scanning for forming a toner image is performed once while sub-scanning is performed by the distance S in the sub-scanning direction.

As a result, on the transparent film 101 (FIG. 1), stripe-shaped toner images having a width S extending above and below the display area are formed at intervals of 3S in the sub-scanning direction. Then, a portion where a stripe-shaped toner image formed in two main scans is formed and a portion where a stripe-shaped toner image formed in one main scan is formed are formed. That is, in this case, a striped toner image formed by the main scanning of R1 and R2 and a striped toner image formed by the main scanning of R1 are formed. Then, FIG.
When the transparent film 101 on which these toner images are formed is moved and arranged at a predetermined location on the color filter 107, light transmitted through the R filter is completely blocked at a certain location and half at a certain location, as shown in FIG. It will be used for display through transmission. As a result, a state in which red is mixed lightly in blue and green mixed colors is displayed.

For example, as shown in FIG.
On the color filter 107 (FIG. 1), while performing sub-scanning by a distance S in the sub-scanning direction at a certain position which is the position of R,
The main scanning for forming a toner image is performed once. As a result, on the transparent film 101, stripe-shaped toner images having a width S / 2 (= D) extending above and below the display area are formed at certain intervals in the sub-scanning direction. In this case, a stripe-shaped toner image is formed by the main scanning of R2 at a predetermined position that is the position of R. Then, as shown in FIG. 3D, by moving the transparent film 101 on which the toner images are formed and disposing the transparent film 101 at a predetermined location on the color filter 107, the light transmitted through the R filter can be transmitted to a certain location. In this case, half of the light is blocked, and in a certain place, all light is transmitted and used for display.
As a result, a mixed color state is displayed in which red adjusted to a predetermined gradation is added in addition to blue and green.

Therefore, according to the present embodiment, the recording section 10 corresponds to the image signal by the signal selection circuit 108.
6 and the toner image formed on the transparent film 101 by the developing device 107, the color light transmitted through the color filter 107 is selectively blocked. That is,
According to the color display device of this embodiment, the color image is visualized and displayed based on the relationship of the color light between the transmitting portion and the non-transmitting portion of the toner image. Therefore, according to this color display device, a color image can be displayed by one image recording of one color (black) toner. In addition, the dot diameter of the dot electrode is set to be equal to or less than half the width of one color region of the color filter in the sub-scanning direction, and main scanning is performed twice during sub-scanning of one color region of the color filter. So
For the expression of one color of the color filter, the transmission amount 0,
Three gradations of half transmission and full transmission can be provided.

In the above description, the multi-stylus electrode is used for the recording section, but the present invention is not limited to this. For example, an electrostatic recording method using so-called ion irradiation using an ion flow head may be used, and a latent image due to an electrostatic charge may be formed on a transparent film without contact. In the electrostatic recording method using the ion irradiation, the irradiation time of the ion current can be easily controlled, so that the recording density of one dot can be changed linearly, and the multi-gradation expression can be easily performed. In the above description, the transmissive display using the backlight is used. However, the present invention is not limited to this. The display may be of a reflection type in which a reflection plate is provided on the side opposite to the transparent film of the color filter. in this case,
What is necessary is just to use white as toner. Further, the configuration of the color filter may be a configuration of yellow, magenta, and cyan. Further, if black is inserted between the colors of the color filter to separate them, the contrast can be improved.

In the above description, two main scans are performed during the sub-scan of the horizontal width of each color constituting the color filter. However, the present invention is not limited to this.
It may be performed more than once. By doing this,
More gradation expression is possible. Further, in the above description, the color filters are configured by the R, G, and B stripe filters, but the present invention is not limited to this. A filter array in which each color is arranged in a dot shape may be used.

[0019]

As described above, according to the present invention, a transparent film, film moving means for moving the transparent film in a predetermined direction, and electrostatic charge recording for forming a latent image by electrostatic charge on one surface of the transparent film. Means, developing means arranged after the electrostatic charge recording means in the direction of movement of the transparent film, and for attaching toner to a latent image formed by electrostatic charge formed on one surface of the transparent film, and developing means in the direction of movement of the transparent film And a color filter disposed on one surface side of the transparent film after the color filter. Therefore, a color display is performed by an image formed by one color toner. As a result, there is an effect that it is not necessary to provide a developing device for each color, and a color display can be performed on a larger display surface without requiring a very large space.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of a color display device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a partial configuration of the color display device according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram for explaining color display according to the embodiment of the present invention.

[Explanation of symbols]

101: transparent film, 102a: take-up roller, 1
02b: delivery roller, 103: drive means, 104:
Color filter, 105 backlight, 106 recording unit, 106a dot electrode, 107 developing unit, 108
Signal circuit, 109: toner, 110: toner removing means.

Claims (11)

[Claims] A transparent film; a film moving means for moving the transparent film in a predetermined direction; an electrostatic charge recording means for forming a latent image due to an electrostatic charge on one surface of the transparent film; Developing means for adhering toner to a latent image due to electrostatic charge formed on one surface of the transparent film, disposed after the electrostatic charge recording means, and the developing means in the moving direction of the transparent film after the developing means. A color display device comprising: a color filter disposed on one surface side of a transparent film. 2. The color display device according to claim 1, wherein the toner is disposed on one surface side of the transparent film after the color filter in a moving direction of the transparent film and adheres to the transparent film. A color display device comprising a toner removing unit for removing toner. 3. The color display device according to claim 1, wherein a plurality of red, blue, and green portions of the color filter are alternately arranged. 4. The color display device according to claim 1, wherein a plurality of the color filters are arranged alternately in yellow, magenta, and cyan portions. 5. The color display device according to claim 3, further comprising a light blocking member disposed between the colors of the color filter. 6. The color display device according to claim 1, further comprising an illuminating unit disposed on a side of the color filter opposite to the transparent film, and illuminating the color filter. Color display device. 7. The color display device according to claim 1, wherein the color filter is disposed on a side of the color filter opposite to the transparent film, and reflects light incident from the transparent film side of the color filter. A color display device, comprising: a reflecting plate. 8. The color display device according to claim 1, wherein the toner is black. 9. The color display device according to claim 1, wherein the toner is white. 10. The color display device according to claim 1, wherein the electrostatic charge recording means forms dots on the transparent film in a main scanning direction perpendicular to a moving direction of the transparent film. A plurality of dot electrodes for applying a static charge in a shape, in addition, by controlling the electrostatic charge recording means and the film moving means, the main scanning by the charge recording means and the sub-scanning by the film moving means A control unit for forming a latent image based on an electrostatic charge composed of an image formed on the one surface of the transparent film. 11. The color display device according to claim 10, wherein a dot diameter of the dot electrode is equal to or less than half of a width of one color region of the color filter in the sub-scanning direction. A color display device, wherein the charge recording unit is controlled so that main scanning is performed twice or more during sub-scanning of one color region of a color filter.