JPS6068950A - Color recording display device - Google Patents

Abstract

PURPOSE:To form characters, graphics and pictures in color with ease only based on the recording of monochromatic image by overlaying image formation sheets with variable density images recorded on coloring source sheets to display a color image. CONSTITUTION:This apparatus uses a transmission type color filter layer 202 having fine filters R, G and B of three primary colors; i.e. red, green and blue, arranged in mosaic and a transparent sheet 200 on which color information is recorded in a black/white halftone image. The transparent sheet 200 is closely contacted with the color filter 202 and fixed without bad register. Then, the assembly is irradiated with a white light from a light source therebehind to color the halftone images, which is observed as color image.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color recording and display device for displaying or temporarily storing color still images.

Conventional configurations and their problems Traditionally, color image recording and display methods, as typified by color photography and color printing, reproduce the original color image by mixing pigments corresponding to the three primary colors. As is well known.

On the other hand, by electronically scanning and decomposing the object, three primary color signals are obtained for each pixel point, and these signals are sent to a light emitter that changes brightness or to a recording device that controls the amount of ink to reproduce the original image. It goes without saying that the principle of reproducing color images is in practical use in color televisions, color facsimiles, and inkjet printers.

Taking color television as an example, tiny three-color dots of red, green, and blue on the phosphor surface correspond to each pixel point, and each emits light relative to the three primary color components of the original image, resulting in so-called additive color mixture. Any density color can be expressed according to this principle. On the other hand, in color printing, the light and shade images of each color component formed on each color separation plate are overprinted using cyan, magenta, and yellow inks, respectively, and the original image is restored according to the so-called subtractive color mixing principle. All of these require power sources for at least three colors that can adjust the amount of light emitted or ink for each pixel point on the image forming surface in response to the three primary color signals.

Instead of adjusting the power supply for each of the three colors individually, a new opaque layer is provided on top of the power supply medium, and the exposure of the power supply layer is controlled by whether or not the opaque layer is removed, allowing color recording. There is a way to do it.

For example, Japanese Patent Application Laid-Open No. 55-49070 discloses a method for color drawing by exposing (coloring) a regularly arranged power base paper through discharge destruction.
, J: h, color difference i (2 papers have a mosaic colored layer similar to a shadow mask in color TVVC, as shown in FIG. 1).

In FIG. 1, a colored insulating layer 3 serving as a power source is provided on the surface of a base paper 2, and in this example, cyan C in color printing is used.
, magenta M, yellow Y, and black and yellow B are regularly arranged at minute intervals □On top of this is a conductive hiding layer 4 made of aluminum or carbon. A white semi-conductive cover 5 is further provided thereon by coating or the like. Concealment f46 is a livid membrane and at the same time forms the ground color of the part that is not colored. Color recording paper 1 with the above structure is colored
To do this, the hidden layers 4 and 5 on the colored insulating layer 3 can be removed to expose the power supplies C, M, Y, and B of the colored insulating layer 3. A fixed electrode 7 is provided on the semiconductive layer 5 that can be electrically conductive with the conductive layer 4 so that the layer 4 serves as one electrode, and the other power source position is set at any of C, M, 'l', and B. A movable electrode 8 is arranged between the fixed electrode 7 and the movable electrode 8, and a voltage is applied from a power source 6 between the fixed electrode 7 and the movable electrode 8. In this case, if a high-frequency AC source is included in the power source 6, the colored insulating layer 3 and the base paper 2 become AC-like current paths, and the semiconductive layer 5 and the conductive layer 4 directly under the movable electrode 8 discharge energy. destroyed and removed.

As a result, the power source of the discharge portion is exposed, so a color image can be formed by applying color signal voltages corresponding to each power source position while scanning the movable electrode 8.

The methods rejected above have the advantage that a color image can be formed using only a single recording stylus, and that the recording apparatus needs to be simple and capable of supplying monochromatic signals. However, on the other hand, the recording paper 1 itself has a complicated structure as shown in FIG. 1, so it is expensive. Furthermore, power supplies C, M, Y, H
Each primary color is a subtractive color mixture system, and since these are divided and arranged in a mosaic pattern, when viewing the formed image as a reflected image, the reflected light from each primary color has an area ratio of at most %, so the saturation is Alternatively, there are drawbacks such as an image with low brightness.

OBJECTS OF THE INVENTION The present invention aims to improve the above-mentioned drawbacks and provide a new display or recording means that can easily and economically form one color character, one figure, and one image by recording only black and white monochrome images. purpose.

Structure of the Invention The present invention comprises a coloring power supply unit 1-1 in which a plurality of primary colors are regularly arranged with a constant pitch, a transparent image forming sheet on which a gradation image is recorded, and a gradation image recording means,
This is a color image recording/displaying device in which a grayscale image is recorded and a color image is displayed by superimposing the image forming sort on a colored power supply sheet.

DESCRIPTION OF EMBODIMENTS FIG. 2a is an embodiment showing the principle of the present invention. This embodiment shows a case where it is applied to a transmissive color image display panel, and 200 shows a transparent sorted image display panel. Formed film-2
01 is black and white halftone image information formed on the soil of the image forming film 200; 202 is a transmissive color filter layer in which minute three primary color filters of red, green, and blue are arranged vertically and horizontally; 20
3 is a milky white diffuser plate-204 is an illumination light source.

In this embodiment, a transparent sheet 2oo on which color information is recorded as a black and white halftone image is fixed in close contact with a color filter 202 placed on the back side so as not to shift. When illuminated, the halftone image becomes colored and is observed as a color image.

FIG. 2 depicts the correspondence of picture elements between the color filter layer 202 and the image forming sheet 201 when the color filter layer 202 is configured in a dot-sequential manner. As shown in the figure, the color filter layer of this example has minute color separation filters for red, green, and blue (indicated by RlG and B in the drawing), just like the phosphor screen of a shadow mask type cathode ray tube in a television receiver. Arranged in a mosaic pattern. Therefore, each mosaic piece of the three color sets of red, green, and blue corresponds to a pixel forming an image. Picture elements 205 of the halftone image overlap at the same coordinate position. A three-color filter is, for example, a gelatin filter having spectral characteristics as shown in FIG. 3a, and is a uniform sheet having the same characteristics regardless of location over the entire filter layer.

On the other hand, the transmittance of each picture element of the image forming sheet 2o○ changes relative to the shading of the three primary color components of the original image.

For example, picture element 205 (l-1: (R, G,
Corresponding to B), the mosaic indicated by (rn, gn, bn) has a light attenuation characteristic as shown in FIG. In this case, picture element 2
As a result of overlapping 05 and 206, 3 of the picture elements observed
It is clear that the primary color components have characteristics such as C as the product of the transmission characteristics shown in FIG. 3a and b.

Therefore, if the mosaic of each picture element of the image forming sheet 200 and the color filter layer 202 in FIG. 2 is sufficiently small and each of the three primary color dots exceeds the spatial resolution of vision, the colors will be mixed by the integral action of the eye. Noy corresponding to the original picture
The image of Ra is less perceptible. Figure 3 shows the picture element 205 (
rn + qn , bn ) It shows the transmittance for white light, and it does not have to be a monochrome layer that simply changes the amount of light. In this case, the light quantity change is performed either by (r n , (Jn + b”)) each having intermediate shading, or by a black and white binary pattern in which the area ratio of transparent and opaque parts is modulated. It's okay.

According to the above basic principle, in the present invention, a monochrome image is formed only on the transparent sheet 2o1 shown in FIG. 2 as an image forming medium. FIG. 4 shows a specific embodiment of the image forming apparatus of the present invention.

In FIG. 4, a shows an example of a color filter layer having a different arrangement from that described above, but the arrangement of the three primary colors may be in the form of vertical or horizontal stripes as in this example. bH This is an image forming apparatus using this vertical stripe color filter, and shows an embodiment in which image recording is performed with a transparent sheet 400 superimposed on this color filter layer 402. transparent sea) 4
00 and color filter layer 402 are placed under suitable illumination from the back, and photosensor 410 and recording head 414 are configured to move on scanning lines 407 and 408 in conjunction with each other. The scanning lines 407 and 40B are in the X direction perpendicular to the direction y of the stripes of the color filter layer 402, the scanning line 40'7 is fixed at a fixed position on the upper side of the sheet, and the scanning line 40B is fixed every time a fixed scanning line is recorded. Move at a constant pitch in the y-axis direction. The scanning line 407 is used to detect the intex signal of the color stripe of the color filter layer 402. That is, the scanning line 407 is synchronized with the scanning line 408 for image recording, and the R,
By repeatedly scanning the G and B color stripes, the photo sensor 410 detects the change in the phase of R, G and B, that is, the pitch. Detection is done by capturing the difference in brightness of R, G, and B stripes, or by using a photo sensor 410.
This can be easily done by, for example, covering it with a G filter and extracting only the 0 color light. Photo Hinsa 41
The optical signal from 0 is processed by the timing generation circuit 411.
It is converted into an index signal that identifies which R, G, or B stripe the photosensor 410 is currently on. This index signal is used to identify which stripe the recording head 414, which moves in conjunction with the photosensor 410, is positioned on, and to print a color signal on the sheet in synchronization with this. That is, the color image signal for a certain number of scanning lines supplied from the terminal 412 is a three-color separation signal of R, G, and B for each pixel point, and is once stored in the line buffer 7 memory 413 and then sent to the timing generation circuit 411. R
, G, and B are sequentially applied to the recording head 414 in this order. For example, an inkjet head can be used as the recording head 414. In this case, the recording head 414 prints the color image signals in the order of R, G, and B supplied from the line buffer memory 413 on the transparent sheet 400 as a black and white gradation image at the corresponding color stripe position immediately below. The recording head 414 may be capable of printing only black ink, and in the principle diagram of FIG.
, bn). According to the configuration of this embodiment, even if there is a variation in the scanning speed, the index signal is accurately synchronized with the color stripe, so no color shift occurs. In addition, the color filter layer 402
Since the pitch is detected each time even if the image has various pitches, it is possible to handle image formation with different densities.

In the above embodiment, the image forming sheet 4oO is replaced every time one sheet is recorded, and the single color filter layer 402trJ-
Fixed and repeated use. That is, in the present invention, since the image forming sheet 400 and the color filter layer 402 are not integrated but separated, only the image forming sheet 400 is consumed 4'A when recording various images. However, it goes without saying that in order to display the recorded six-color image as the original horn image, it must be used by superimposing it on the gray filter layer 402. Therefore, the present invention! 1
2. The length is fixedly set up in the morning, for example in the form of a commercial advertising pile, as illustrated in Figure 2a above.
The advantage of this lighting panel, which has a single layer of color mosaic filters, is that the display content can be changed by replacing only the image forming sheet. Since the image forming sheet 400 is a black and white monochromatic image, it can be produced at a lower cost, more easily, and in a shorter time than the color printing or color photographic images used in general commercial advertising panels. An example is shown.

Reference numerals 500 and 502 are a transparent sheet for image formation and a color filter layer similar to those described above, and 514 is a recording head. FIG. 5A shows an example in which a gloss pen used in a plotter is used as the recording dot 514, and a grayscale image is recorded by printing dots whose density is modulated depending on the color signal. The figure shows an example in which a multi-stylus (multi-needle electrode) for electrostatic recording is used in the recording head 514, and color-sequential toner images are formed on a transparent sheet similarly to an electrostatic printer or an electrostatic facsimile. It is something to do.

In the above embodiments, the same color filter layer used for image display is used to obtain an index signal during image formation, but the color filter layer is not necessarily required for index signal generation. A black and white striped pattern having the same pitch as the color filter layer may be used, or an electrical lock signal corresponding to the pitch may be used if the precision of the scanning system is sufficiently high.

Further, in the above embodiment, the case where three primary colors of R, G, and B are used as a power source is exemplified, but the selection of these primary colors is free. For applications that do not require the display of natural color images, a combination of specific colors may be used, or the color gamut can be expanded by adding high-saturation special colors that are difficult to express with R, G, and B alone. D. Effects of the Invention As described above, the present invention has a colored power supply sheet in which a plurality of primary colors are arranged with a constant pitch and an image forming sheet, and this image forming sheet has a colored power sheet. A color recording/display device that records a monochromatic gradation image of an image signal and then superimposes it on a colored color difference sheet to display a color image.It is possible to record and display a color image by recording only a monochromatic gradation image. Compared to the color recording method in which the power source lit and the hiding layer are integrated, it is possible to obtain a recorded image at a lower cost and more easily. In particular, in the present invention, by separating the image recording sheet and the color filter layer, various color images can be displayed by replacing only the image recording sheet, which is suitable for commercial advertisements and displays where display contents are changed over a short period of time. It is. In the present invention, transparent R,
Since an image can be displayed by transparent additive color mixing using the G and B three primary colors, a color image with high brightness and saturation can be realized by back lighting.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional color image recording device that records a color image with a single recording stylus by discharge breakdown, and FIGS. 2a and 2b are perspective views showing an embodiment of the color image recording device according to the present invention. 3A to 3C are transmission characteristic diagrams for explaining the operation of FIG. 2, and FIGS. 4A and 4B are color filter layers in other embodiments of the color image recording device according to the present invention. Enlarged front view and perspective view of the device, Figure 5a
. b is a sectional view and a perspective view, respectively, showing still other embodiments of the color image recording apparatus according to the present invention. 200.400.500...Transparent image forming film, 2
010. ...image information, 202,402,502...
・Color filter layer, 203... Milky white diffuser plate, 20
4...Illumination light source, 205.206...Picture element, 407°408...Scanning line, 410...
...Photo sensor, 411...Tie ε blowfish generation circuit, 413...Line buffer 7 memory, 414,
614... Recording head O Name of agent Patent attorney Toshio Nakao and 1 other person 1st
Figure 4 CI2/n Figure 5

Claims (5)

[Claims] (1) A colored color source sheet in which a plurality of primary colors are regularly arranged with a certain pinch, a transparent image forming sheet, and a gradation image recording means are provided, and the colored color source is placed on the image forming sheet. 1. A color recording/display apparatus characterized in that a color image signal is recorded as a monochromatic gray image in synchronization with a pitch of , and then an image forming sheet is superimposed on the colored color source sheet to display a color image. (2) The color recording and display device according to claim (1), wherein the colored color source sheet is a transparent sheet consisting of three primary colors of red, green, and blue. (3) A color recording/displaying device according to claim (1), wherein the pale image recording means is an inkjet recording device. (4) The color recording/displaying device according to claim (1), wherein the grayscale image recorded on the image forming sheet is composed of minute black and white binary dots. (5) A color recording and display device according to claim (1), wherein a color image is displayed by illumination from the back.