JP2004184684A - Picture display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a picture display device with which multicolor display is carried out while maintaining display quality of a picture. <P>SOLUTION: The picture display device performs multicolor display by attaching a coloring substrate 22 with a coloring layer 18 thereto so as to be laminated on a display substrate 24 and a rear surface substrate 30 of a picture display medium 12 and transferring colored particles (white particles 36 and black particles 38) enclosed inside to the surrounding area so as to make the coloring layer 18 of the coloring substrate 22 be visually recognizable from the display substrate side X. Also by exchanging and moving the coloring substrate 22, the multicolor display is carried out while maintaining display quality of the picture and a change of the display is made to be simply feasible. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image display device that displays colored images on an image display medium by driving colored particles with an electric field.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an image display device that has excellent display image retention and can be rewritten repeatedly, an image display device that displays an image using particles that move by an electric field is known. Such an image display device includes an image display medium having a configuration in which conductive black particles and insulating white particles are sealed between a transparent display substrate and a back substrate facing the transparent display substrate with a minute gap. (For example, refer nonpatent literature 1.). According to this technique, when a voltage is applied between these substrates, the black particles are positively charged, and move between the substrates while separating the white particles according to the electric field formed between the substrates. When the black particles are moved to the display substrate side, black display is performed, and when the black particles are moved to the rear substrate side, white display by white particles is performed.
[0003]
In addition, there is known a technology including an image display medium in which a highly insulating non-colored dispersion medium and at least two types of electrophoretic fine particles having different electrophoretic properties are sealed between a pair of substrates at least on the display surface side. (For example, refer to Patent Document 1). According to this technology, two types of electrophoretic fine particles, one of which is white particles and the other consists of colored particles having a color tone different from that of the white particles, are charged to opposite polarities, and a voltage is applied between the substrates. Then, each moves to a separate substrate side. In this way, an image is displayed by applying a voltage according to the image information between the substrates and attaching any one colored particle to the display substrate.
[0004]
These image display media display an image by attaching any one of two kinds of colored particles according to image information on a transparent display substrate surface, and are colored with high light hiding properties. By using particles, it is possible to display a clear image with high contrast by using two types of particles having different colors.
[0005]
Further, in order to perform multicolor display on an image display medium using two kinds of colored particles having different colors, the display substrate and the back substrate are separated by a gap member to form a cell structure, and colored particles having different colors in each cell. And a method of expressing one color in several adjacent cells. For example, a combination of three types of particles, black particles and red particles, black particles and green particles, and black particles and blue particles, is regularly encapsulated in each cell, and at least one adjacent red, green, and blue cell has one color. It represents a pixel. An arbitrary color can be displayed by moving the black particles and the red, green, and blue color particles in accordance with the image signal and controlling the reflection of the RGB light.
[0006]
[Non-Patent Document 1]
Japan Hardcopy, 1999 Proceedings, p. 249-252
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-242482 (first page, FIG. 1)
[0007]
[Problems to be solved by the invention]
However, in these methods, since an arbitrary color is expressed by a plurality of pixels formed by particles of Red, Green, and Blue, the resolution of the display image is lowered. In addition, when an arbitrary color area is regular, an arbitrary color is displayed in the regular color area, so that similar control is repeatedly requested, and unnecessary control is necessary.
[0008]
In view of the above facts, an object of the present invention is to provide an image display apparatus capable of performing multicolor display while maintaining image display quality.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an image display device of the present invention includes a display substrate having at least translucency, a back substrate having at least translucency facing the display substrate with a gap, and the display substrate and the back substrate. An image display medium comprising: at least one type of colored particles encapsulated movably between the substrates according to an electric field formed by a voltage applied between the substrates; and on the back substrate side, At least a part of a colored substrate including a colored region having a color different from the color of the colored particle group is attached to the display substrate and the back substrate, and the image display medium. And voltage applying means for applying a voltage for generating an electric field for moving the particle group between the substrates.
[0010]
The image display device of the present invention includes an image display medium. In the image display medium, a group of colored particles is enclosed between a display substrate having at least translucency and a back substrate having at least translucency facing the display substrate with a gap. The colored substrate includes a colored region having a color different from the color of the colored particle group enclosed between the display substrate and the back substrate. The attachment means is attached so that at least a part of the colored substrate is laminated on the display substrate and the back substrate. The voltage applying means applies a voltage to the image display medium, and the colored particles move between the substrates by applying the voltage. Thereby, an image is displayed on the image display medium. Since the laminated colored substrate includes the colored region, the colored region can be presented by dropping the image display medium.
[0011]
Accordingly, it is possible to present a combined color by displaying an image on the image display medium and presenting the colored region of the colored substrate.
[0012]
Moreover, in an attachment means, it can replace | exchange for the colored substrate containing the coloring area | region of arbitrary colors. For example, if a plurality of colored substrates having different colors in the colored region are prepared in advance and replaced at any time, the displayed color can be easily changed. In addition, since different colors can be displayed in the colored region by exchanging the colored substrate, it is possible to present a typical colored region and prevent a reduction in image resolution due to multicolor display.
[0013]
An example of displaying an image on an image display medium will be described. In this case, the voltage applying means applies a DC voltage or an alternating voltage to a predetermined position so that a DC electric field or an AC electric field of a first predetermined cycle (several cycles) is formed. Thereby, each color particle group moves to the display substrate side or the back substrate side. Therefore, particle color display, for example, white or black display can be performed at a predetermined position. Further, the voltage application means has more cycles (second cycle) than the first cycle for moving each color particle group in a direction parallel to the display substrate surface between the display substrate at a predetermined position of the rear substrate and the rear substrate. An alternating voltage is applied so that an alternating electric field is formed. Thereby, the colored particle group moves around the position where the voltage is applied, and the color of the colored region of the colored substrate can be displayed via the transparent display substrate and the transparent back substrate.
[0014]
In this way, multicolor display is performed by moving the particles so that the color of the colored region of the colored substrate can be viewed from the display substrate side, so that multicolor display can be performed while maintaining the display quality of the image.
[0015]
The attachment means can attach the colored substrate so that the colored region is movable with respect to the rear substrate. For this reason, the colored substrate can be attached so as to be movable in a direction in which the colored substrate is brought into contact with or separated from the rear substrate. For example, when the contact is made, the color of the colored region of the colored substrate can be displayed more clearly, and when the contact is made, the colored region can have a sense of distance. Further, when the colored substrate is moved in a direction parallel to the rear substrate, the display color can be easily changed. In this case, the colored region can be adjusted in the parallel direction, or the colored substrate itself can be easily replaced.
[0016]
The colored substrate is formed in a sheet shape, and the attachment means stores storage means for storing the colored substrate in a roll shape, and at least a part of the sheet-like colored substrate stored in the storage means and the display substrate. It can be comprised from the holding means hold | maintained so that it may be laminated | stacked on a back substrate.
[0017]
The storage means constituting the attachment means stores the colored substrate formed in a sheet shape in a roll shape. The colored substrate accommodated in the accommodating means is held by the holding means in a state where at least a part of the colored substrate is sent out so as to be laminated on the display substrate and the back substrate. For this reason, since the colored substrate can be automatically or manually sent out from the storage means as necessary, the position and color of the colored region of the colored substrate visually recognized from the display substrate side through the display substrate and the back substrate can be easily changed. The display can be changed.
[0018]
The attachment means may be composed of an assembling means for rotatably attaching the colored substrate in a direction along the colored substrate surface and a rotating means for rotating the colored substrate. The colored substrate is rotated in a direction along the colored substrate surface by the assembling unit, and the colored region of the colored substrate is visually recognized from the display substrate side through the display substrate and the back substrate as the colored substrate is rotated by the rotating unit. Can be changed. For this reason, a display can be changed easily.
[0019]
The colored substrate may include a light emitting element. By emitting or blinking the light emitting element included in the colored substrate, the colored substrate that has been emitted and blinked is visually recognized, so that it is possible to display an image with rich expressive power.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
A first embodiment according to an image display device of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 shows a schematic configuration of the image display apparatus 10. The image display device 10 includes an image display medium 12, a driving device 14, a mounting member 16, and a colored substrate 22. The image display medium 12 is for displaying an image on the viewing side X so as to be visible, and is connected to the driving device 14. The drive device 14 is for selectively applying a DC voltage or an AC voltage to the image display medium 12 according to image information. The colored substrate 22 is for performing multicolor display. The attachment member 16 is for attaching the colored substrate 22 so as to be laminated on the image display medium 12.
[0022]
The image display medium 12 includes a transparent display substrate 24 provided on the viewing side X, a transparent back substrate 30 facing the display substrate 24 with a slight gap, a gap member 32 that holds the substrates at a predetermined interval, and these The white particles 36 and the black particles 38 having different charging characteristics enclosed between the substrates.
[0023]
The display substrate 24 has a configuration in which a glass substrate 25, a line electrode 26, and an insulating layer 28 are laminated. In this embodiment, a glass substrate having a thickness of 1.1 mm (# 1737 manufactured by Corning) is used as the glass substrate 25. A plurality of line electrodes 26 are formed on the glass substrate 24 by an ITO conductive film. The insulating layer 28 is formed by applying a polycarbonate resin to the line electrode 26.
[0024]
Similar to the display substrate 24, the back substrate 30 has a configuration in which a glass substrate 40, line electrodes 42, and an insulating layer 44 are laminated. The line electrode 42 is provided in a direction orthogonal to the line electrode 26.
[0025]
The gap member 32 is formed so as not to impair the transparency of the display medium 12. In the present embodiment, the gap member 32 is formed by photoetching of a dry film type photoresist and has a height of 200 μm. The gap member 32 can be integrally formed with the back substrate 30 or the display substrate 24.
[0026]
In this embodiment, the white particles 36 are spherical white particles of titanium oxide-containing crosslinked polymethylmethacrylate having a volume average particle size of 20 μm mixed with fine powder of titania treated with isopropyltrimethoxysilane at a weight ratio of 100 to 0.1. Particles (Techpolymer MBX-20-White manufactured by Sekisui Plastics Co., Ltd.) were used. The black particles 38 are spherical black particles of carbon-containing crosslinked polymethylmethacrylate having a volume average particle size of 20 μm, which is a mixture of aminopropyltrimethoxysilane-treated Aerosil A130 fine powder at a weight ratio of 100 to 0.2. Seiko Kogyo Co., Ltd. Techpolymer MBX-20-Black) was used.
[0027]
The white particles 36 and the black particles 38 were mixed at a weight ratio of 2: 1. At this time, the white particles 36 were negatively charged and the black particles 38 were positively charged. Further, the total volume ratio of the mixed particles of the white particles 36 and the black particles 38 to the void volume between the display substrate 24 and the back substrate 30 was about 12%. In the present embodiment, the white particles 36 and the black particles 38 are used. However, any colored particles other than the combination of white and black can be used as long as the colored particles have different charging characteristics. It is also possible to use only one kind of particles that are positively or negatively charged and colored.
[0028]
The colored substrate 22 has a configuration in which the colored layer 18 is laminated on the background plate 20. As the background plate 20, various films including a glass substrate and a resin substrate such as acrylic can be used. In this embodiment, an acrylic resin substrate having a thickness of 1.0 mm is used. The colored layer 18 is obtained by coloring a colorant in an arbitrary pattern on the background plate 20. In the present embodiment, after the entire surface is printed with white printing ink on the background plate 20 to form a white reflective layer, the red, green, and blue color filter inks are striped (as shown in FIG. A colored substrate 22 on which a colored layer 18 (18R, 18G, 18B) is formed by arranging and printing regularly in a rectangular shape is prepared. In the present embodiment, in order to simplify the description, the width and pitch of each color stripe will be described as being substantially the same width and pitch as the line electrode 26 and the line electrode 42.
[0029]
A plurality of colored substrates on which a colored layer having a different colored pattern from the colored layer 18 is formed are prepared. In this embodiment, it is assumed that one colored substrate 23 for forming a colored layer 19 (19M, 19Y, 19C) having a different colored pattern from the colored layer 18 (18R, 18G, 18B) shown in FIG. 3 is prepared. explain.
[0030]
In addition, the coloring pattern of the colored layer 18 and the colored layer 19 is not limited to a stripe shape, and it is possible to form a colored pattern including an arbitrary character or pattern. Further, the white reflective layer may not be formed on the background substrate 20 and only the colored layer may be used. Moreover, the colored layer 18 does not need to have a light transmittance.
[0031]
The attachment member 16 is attached to the image display medium 12 and is for attaching the colored substrate 22 so as to be laminated on the display substrate 24 and the back substrate 30. Various materials such as glass, plastic, and acrylic resin can be used as the attachment member 16. The colored substrate 22 is laminated on the back substrate 30 with a small gap by the mounting member 16. The minute gap may be a gap that allows the color of the colored layer 18 of the colored substrate 22 to be visually recognized from the viewing side X through the display plate 24 and the back substrate 30.
[0032]
Note that the attachment member 16 may be disposed with the colored substrate 22 in contact with the back substrate 30. In this case, the attachment member 16 may be made of a fragile adhesive resin that can be removed from the colored substrate 22. Specifically, a resin layer having fragile adhesiveness may be coated on both or any one of the colored substrate 22 and the back substrate 30.
[0033]
The display substrate 24 corresponds to the display substrate of the present invention, the back substrate 30 corresponds to the back substrate of the present invention, and the white particles 36 and the black particles 38 correspond to the colored particle group of the present invention. The image display medium 12 corresponds to the image display medium of the present invention, and the mounting member 16 corresponds to the mounting means of the present invention. The line electrode 26 and the line electrode 42 correspond to the voltage applying means of the present invention.
[0034]
FIG. 4 is a block diagram showing an electrical configuration of the image display apparatus 10 according to the present embodiment.
[0035]
The image display medium 12 has a configuration of a simple matrix driving system in which the line electrodes 26 formed on the display substrate 24 and the line electrodes 42 formed on the back substrate 30 are arranged so as to intersect each other. . Although not shown, the line-shaped electrode 26 and the line-shaped electrode 42 are formed on each substrate with the number of electrodes corresponding to the number of vertical and horizontal pixels necessary for image display.
[0036]
The driving device 14 includes a column electrode driving circuit 50, a row electrode driving circuit 52, a sequencer 54, an external power source 56, and an image input device 58. The line electrode 26 and the line electrode 42 are connected to a column electrode drive circuit 50 and a row electrode drive circuit 52, respectively. The column electrode drive circuit 50 and the row electrode drive circuit 52 are connected to a sequencer 54 and an external power source 56. The sequencer 54 is connected to the image input device 58, and outputs signals to the column electrode drive circuit 50 and the row electrode drive circuit 52 in accordance with image information input from the image input device 58.
[0037]
In such an image display device 10, an image writing signal (scanning signal) for each line-shaped electrode 42 is sent from the sequencer 54 to the row electrode driving circuit 52, and the image writing is performed from the row electrode driving circuit 52 to the line-shaped electrode 42. A voltage (hereinafter referred to as a scanning voltage) is sequentially applied. At the same time, in synchronization with the application of the scanning voltage, an image writing voltage (hereinafter referred to as an image signal voltage) corresponding to the image information is applied to the line electrode 26 via the column electrode drive circuit 50. The scanning direction of the scanning voltage applied to the line electrode 42 is the arrow Z direction. Thereby, a desired image is displayed on the display medium 12.
[0038]
Here, for example, when displaying a pixel at the intersection 59 between the line electrode 42a on the back substrate 30 and the line electrode 26b on the display substrate 24, the pixel at the intersection 59 has Vcon (image signal voltage) −Vron (scanning). Voltage) is applied, and an image is displayed. At this time, since the voltage Vcon is simultaneously applied to the pixel column along the line electrode 42a in addition to the pixel at the intersection 59, the particles may not move and the image may not be displayed at the voltage Vcon or −Vron. This is a prerequisite for performing simple matrix driving.
[0039]
FIG. 7 shows the relationship between the applied voltage and the display density of the image display medium 12 used in the present embodiment. This is a result of the image display density when all the line electrodes 42 are grounded and a pulse voltage is applied to all the line electrodes 26. The image display density (reflection density) was measured with X-Rite 404 (manufactured by X-Rite). As is clear from FIG. 7, when the image display medium 12 performs black display from the white display state, display is not performed until the voltage becomes about −60V or more. Further, when white display is performed from the black display state, the display is not performed until about + 60V or more. Therefore, in this embodiment, ± 60 V is used as the applied voltage.
[0040]
Next, an image display method of the image display medium 12 of the present embodiment will be described.
[0041]
In the present embodiment, a case will be described in which colored display is performed on the pixel at the intersection 59 between the line electrode 42a and the line electrode 26b shown in FIG. In the following description, it is assumed that all electrodes on which no image is written are set to 0V or installed.
[0042]
In FIG. 5, the movement of the white particles 36 and the black particles 38 of the image display medium 12 is shown using the AA cross-sectional view of the image display medium 12 of FIG. 4. Further, FIG. 6 shows display transition of the image display medium 12.
[0043]
When performing monochrome display, a pulse voltage of −60 V is applied to the line electrode 42 as the scanning voltage Vron, and a +60 V pulse voltage is applied as the line electrode 26 image signal voltage Vcon. As a result, as shown in FIG. 5A, in the voltage-applied region, the negatively charged white particles 36 move to the display substrate 24 side, and the positively charged black particles 38 move to the back substrate 30 side. Thus, good white display can be performed. Similarly, a pulse voltage of +60 V is applied to the line electrode 42 as the scanning voltage Vron, and a pulse voltage of −60 V is applied as the line electrode 26 image signal voltage Vcon. As a result, the positively charged black particles 38 move to the display substrate 24 side and the negatively charged white particles 36 move to the back substrate 30 side in the region where the voltage is applied, thereby performing a good black display. Can do. Thereby, a black and white display image by the white particles 36 and the black particles 38 can be obtained.
[0044]
Next, a case where multicolor display is performed will be described. As shown in FIG. 6B from the white display shown in FIG. 6A, when the colored display is performed at the intersection 59, first, the scanning voltage Vron is applied to the line electrode 42a of the back substrate 30 as ± 60V and the frequency 200Hz. The alternating pulse voltage of 20 cycles is applied. At the same time, an alternating pulse voltage having an image signal voltage Vcon of ± 60 V, a frequency of 200 Hz and a phase different from the scanning voltage Vron by 180 degrees is applied to the line electrode 26 b for 20 cycles. As a result, as shown in FIG. 5B, the white particles 36 and the black particles 38 hardly exist in the region corresponding to the intersection 59 between the line electrode 26b and the line electrode 42a. That is, as shown in FIG. 6B, the 18G color of the colored layer 18 formed on the colored substrate 22 from the viewing side X through the display substrate 24 and the back substrate 30, in this case, the green color can be seen well. can do.
[0045]
Next, a method for changing the display color will be described. As shown in FIG. 5C, the colored substrate 22 is removed from the attachment member 16, and the colored substrate 23 having the different color layers 19 (19M, 19Y, 19C) shown in FIG. 3 is attached to the attachment member 16. Then, the colored layer 19 </ b> Y of the colored substrate 23 is visually recognized from the viewing side X through the display substrate 24 and the back substrate 30. That is, as shown in FIG. 6C, the 19Y color of the colored layer 19 formed on the colored substrate 23 from the viewing side X, in this case, the Yellow color can be seen well.
[0046]
It should be noted that the white particles 36 and the black particles 38 can be arbitrarily selected according to the image information by applying an alternating pulse voltage in the same manner in the pixels at the intersections between the line electrodes 26 and the line electrodes 42 other than the intersection points 59. It is possible to display the color of the colored layer of the colored substrate.
[0047]
For this reason, since the multicolor display is performed by moving the white particles 36 and the black particles 38 according to the image information so that the color of the colored layer 18 of the colored substrate 22 is visible, the quality of the display image is improved. Multicolor display can be performed while maintaining.
[0048]
Further, since the display color of the multicolor display is changed by exchanging the colored substrate, the display color can be easily changed and the multicolor display can be performed while maintaining the quality of the display image.
[0049]
Further, by combining the monochrome display and the multicolor display, a good multicolor display can be realized with a small number of types of particle groups.
[0050]
In the present embodiment, the image display medium 12 has been described as having a matrix driving method. However, the present invention is not limited to this method, and a plurality of isolated electrodes to which a voltage can be applied independently are regularly arranged. You may use the structure of the active drive system which displays an image by using the arrange | positioned electrode head and applying an electric field for every display pixel. Note that the voltage applied at this time may be a voltage that can move the black particles 38 and the white particles 36 by the potential difference generated between the substrates by the application of the voltage.
[0051]
In the present embodiment, the line electrode 26 and the line electrode 42 as the ITO electrode film have been described as being laminated in the opposite directions of the glass substrate 25 and the glass substrate 40, respectively. It is also possible to adopt a configuration that does not include. In this case, an electric field may be applied from the outside of the image display medium 12 using an application head for applying a voltage.
[0052]
[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the first embodiment, the display color in the multicolor display is changed by replacing the colored substrate 22 attached by the attachment member 16 with a colored substrate 23 having a different colored pattern of the colored layer. The case where the color is changed has been described. In the present embodiment, a case where the colored substrate 62 is attached so as to be rotatable in the direction along the plate surface of the colored substrate 62 and the display color is changed by the rotation of the colored substrate 62 will be described.
[0053]
Since the present embodiment has the same configuration as that of the above embodiment, the same portions are denoted by the same reference numerals and detailed description thereof is omitted.
[0054]
As shown in FIG. 8, the image writing device 20 of the present embodiment includes an image display medium 12, a driving device 64, a colored substrate 62, a motor 66, and a motor driving unit 68. The image display medium 12 is connected to the driving device 64. The drive device 64 is for selectively applying a DC voltage or an AC voltage to the image display medium 12 in accordance with image information, and for controlling the rotation of the colored substrate 62. The colored substrate 62 is for performing multicolor display, and is laminated on the rear substrate 30 with a minute gap. The minute gap may be a gap that allows the colored layer 60 of the colored substrate 62 to be visually recognized from the viewing side X through the image display medium 12. The colored substrate 62 is attached by a support shaft 70 and is attached so as to be rotatable in a direction along the plate surface of the colored substrate 62 with the support shaft 70 as a central axis. The motor 66 is for rotating the colored substrate 62 via the support shaft 70, and operates under the control of the drive device 64 via the motor drive device 68.
[0055]
The colored substrate 62 has a configuration in which a colored layer 60 is laminated on the background plate 20. The colored layer 60 is obtained by coloring a colorant in an arbitrary pattern on the background substrate 20. In this embodiment, as shown in FIG. 9A, after the white reflective layer is formed on the background plate 20 by printing the entire surface with white printing ink, the red and green color filter inks are linearly formed. A colored substrate 62 on which a colored layer 60 (60R, 60G) printed on is formed is prepared. The colored substrate 62 can be shaped according to the rotational form.
[0056]
The motor 66 and the motor drive unit 68 correspond to the rotating means of the present invention, and the support shaft 70 corresponds to the assembling means of the present invention.
[0057]
The drive device 64 is substantially the same as the electrical configuration of the drive device 14 of the image display device 10 although the electrical configuration diagram is omitted. The motor drive unit 68 is driven by the control of the image input device 58 included in the drive device 64.
[0058]
Next, the multicolor image display method of this embodiment will be described.
[0059]
In the present embodiment, the image display method of the image display medium 12 is colored as shown in FIG. 4 for the pixel at the intersection 59 between the line electrode 42a and the line electrode 26b, as in the first embodiment. The case where it performs is demonstrated. In the following description, it is assumed that all electrodes on which no image is written are set to 0V or installed.
[0060]
FIG. 10 shows the movement of the white particles 36 and the black particles 38 of the image display medium 12 by using the AA cross-sectional view of the image display medium 12 of FIG. 4 and the rotation of the colored substrate 62. FIG. 11 shows a display transition of the image display medium 12 accompanying the transition of FIG.
[0061]
First, when performing multicolor display, as in the first embodiment, white particles 36 are displayed on the display substrate 24 side as shown in FIG. 10A in a white display state (see FIG. 11A). Adhering to
[0062]
By applying the alternating pulse voltage, as shown in FIG. 10 (B), the white particles 36 and the black particles 38 almost disappear, and as shown in FIG. 11 (B), 60R of the colored layer 60. And 60G colors, that is, two colors of Red and Green can be presented well.
[0063]
Next, as illustrated in FIG. 10C, the colored substrate 62 is rotated in the Y direction via the motor 66 under the control of the driving device 64. In the present embodiment, a case where the image is rotated 180 degrees, that is, reversed is described. As shown in FIG. 11C, the colored layer 60 of the colored substrate 62 viewed from the viewing side X through the display substrate 24 and the back substrate 30 is displayed with the colors 60R and 60G reversed.
[0064]
It should be noted that the white particles 36 and the black particles 38 can be arbitrarily selected according to the image information by applying an alternating pulse voltage in the same manner in the pixels at the intersections between the line electrodes 26 and the line electrodes 42 other than the intersection points 59. The display color can be changed by moving the colored substrate 62 from the location to the periphery and rotating the colored substrate 62.
[0065]
For this reason, since the display color can be easily changed by rotating the colored substrate 62, it is possible to easily change the display color displayed in multiple colors while maintaining the quality of the display image.
[0066]
In the present embodiment, the case where the colored substrate 62 is rotated by 180 degrees has been described. However, the colored substrate 62 can be stopped at a predetermined rotational frequency.
[0067]
Alternatively, the coloring pattern of the coloring layer 60 may be stored in the image input device 58 in advance, and the rotation of the motor 66 may be controlled so that the rotation according to the image information is performed.
[0068]
Further, since the colored substrate 62 only needs to be rotatable in the direction along the colored plate surface, the colored substrate 62 may be manually rotated while being attached by the attachment means 16 described in the first embodiment. .
[0069]
[Third Embodiment]
Next, a third embodiment of the present invention will be described. In the second embodiment, the case where the colored substrate 62 is rotatably attached in the direction along the plate surface of the colored substrate 62 and the display color is changed by the rotation of the colored substrate 62 has been described. A sheet-like colored substrate is stored in a roll shape, and at least a part of the colored substrate is held so as to be stacked on the display substrate and the back substrate, and the display color is changed by sending the colored substrate in a direction along the plate surface. The case where it does is demonstrated.
[0070]
Since the present embodiment has the same configuration as that of the first embodiment, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0071]
As shown in FIG. 12, the image writing device 30 of the present embodiment includes an image display medium 12, a driving device 74, a roll holder 76, a roll holder 78, a colored substrate 72, a motor 82, a motor 84, and a motor driving unit. It is comprised from 88. The image display medium 12 is connected to the driving device 74. The drive device 74 is for selectively applying a DC voltage or an AC voltage to the image display medium 12 in accordance with image information and for controlling the rotation of the motor 82 and the motor 84. The colored substrate 72 is formed in a sheet shape for performing multicolor display. Both ends of the colored substrate 72 are fixed to a roll holder 76 and a roll holder 78. The roll holder 76 and the roll holder 78 are substantially cylindrical, and are used for winding the sheet-like colored substrate 72 along the outer periphery, and are provided rotatably about the axis. The colored substrate 72 is held in such a manner that both ends are wound around the roll holder 76 and the roll holder 78, so that the colored substrate 72 is laminated on the back substrate 30 with a minute gap. The minute gap may be a gap that allows the colored layer 92 of the colored substrate 72 to be visually recognized from the viewing side X through the display substrate 24 and the back substrate 30.
[0072]
The motor 82 and the motor 84 are for rotating the roll holder 76 and the roll holder 78, respectively. The motor driving device 88 is for driving the motor 82 and the motor 84 under the control of the driving device 74. For this reason, the colored substrate 72 is fed in the feeding direction Y by the rotation of the roll holder 76 and the roll holder 78. The colored substrate 72 can also be sent in the reverse direction by the rotation of the roll holder 76 and the roll holder 78.
[0073]
The colored substrate 72 is configured by laminating a colored layer 92 on a sheet-like background sheet 90. The background sheet 90 is composed of, for example, a paper medium or a PET film. In the present embodiment, a PET film having a thickness of 0.3 mm is used as the background sheet 90. The colored layer 92 is obtained by coloring a colorant in an arbitrary pattern on the background sheet 90. In the present embodiment, a white reflective layer is formed by printing the entire surface of the background sheet 90 with white printing ink, and then red, green, and blue color filter inks are printed, and the colored layer 92 (92R, 92G, 92B). Note that the coloring pattern of the coloring layer 92 is not limited to the above pattern, and it is possible to form an arbitrary character or pattern and a coloring pattern of a color other than Red, Green, and Blue.
[0074]
The roll holder 76 and the roll holder 78 correspond to the storage means of the present invention, and the motor 82, the motor 84, and the motor drive unit 88 correspond to the holding means of the present invention.
[0075]
In addition, the drive device 74 is substantially the same as the electrical configuration of the drive device 14 of the image display device 10, although the electrical configuration diagram is omitted. The motor drive unit 88 is driven by the control of the image input device 58 included in the drive device 74.
[0076]
Next, the multicolor image display method of this embodiment will be described.
[0077]
In the following description, it is assumed that all electrodes on which no image is written are set to 0V or installed.
[0078]
FIG. 12 shows a schematic configuration diagram of the image display apparatus 10. FIG. 10 shows the transition of display on the image display medium 12 as the colored substrate 72 is driven.
[0079]
In the case of performing multicolor display, as in the first embodiment, by applying an alternating pulse voltage, as shown in FIG. The color of the colored layer 92 formed on the substrate 72 can be seen well. For example, the 92R color (Red) of the colored layer 92 shown in FIG.
[0080]
Next, the roll holder 76 and the roll holder 78 are rotated in the Y direction via the motor 82 and the motor 84 under the control of the driving device 74. The colored substrate 72 is fed in the feed direction Y by the rotation of the roll holder 76 and the roll holder 78. Then, the range of the colored layer 92 of the colored substrate 72 visually recognized from the viewing side X through the display substrate 24 and the back substrate 30 is changed. For example, on the viewing side X, as shown in FIG. 13B, when the colored substrate 72 is sent in the feed direction Y, different colored areas can be seen and the display color is changed. In the present embodiment, the green color made visible by sending the colored substrate 72 together with the 92R color (Red) of the colored layer 92 formed on the colored substrate 78 can be presented well.
As described above, the sheet-like colored substrate 72 is accommodated in a roll shape, the colored substrate 72 is held so as to be stacked on the display substrate 24 and the back substrate 30, and the colored substrate 72 is sent in the feeding direction Y. The display color of the multicolor display can be changed.
[0081]
Note that the rotation of the roll holder 76 and the roll holder 78 under the control of the driving device 74 stores the colored pattern of the colored layer 92 in the image input device 58 in advance, and the display color of the multicolor display corresponding to the image information is changed. In this way, the colored substrate 92 may be controlled to be sent.
[0082]
[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. In this embodiment, the case where a colored substrate provided with a light-emitting element is used as the colored substrate is described.
[0083]
Since the present embodiment has the same configuration as that of the first embodiment, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0084]
As shown in FIG. 14, the image writing device 40 according to the present embodiment includes an image display medium 12, a driving device 100, a switch 102, a mounting member 16, and a colored substrate 98. The colored substrate 98 is configured by laminating a colored portion 96 on a background plate 20 such as a glass substrate or acrylic. As shown in FIG. 15A, the coloring portion 96 includes a light emitting portion 96A and a coloring layer 96C. The light emitting unit 96 </ b> A is provided with a plurality of light emitting elements (not shown) such as LEDs and ELs, and each light emitting element is connected to the driving apparatus 100 via the switch 102. The light emitting element is provided to be able to emit light and blink through the switch 102 under the control of the driving device 100. In the present embodiment, the colored layer 96C is printed on the background plate 20 with a white printing ink to form a white reflective layer, and then red, green, and blue color filter inks are striped (rectangular). ) Are regularly arranged and printed to form a colored layer 96C (96R, 96G, 96B). Note that colors or characters other than the Red, Green, and Blue colors may be irregularly colored. Further, the colored portion 96 may be configured by only the light emitting portion 96A without forming the colored layer 96C.
[0085]
The driving device 100 is for selectively applying a DC voltage or an AC voltage to the image display medium 12 according to image information, and for controlling light emission and blinking of the light emitting unit 96A. Although the electrical configuration diagram of the drive device 100 is omitted, the configuration is substantially the same as the electrical configuration of the drive device 14 of the image display device 10. The switch 102 is switched on / off under the control of the image input device 58 included in the driving device 100. Although not shown, the switch 102 includes a plurality of switches and capacitors for switching on / off each of the plurality of light emitting elements.
[0086]
Since the other configuration of the image display device 40 is the same as that of the image display device 10, detailed description thereof is omitted.
[0087]
Next, the multicolor image display method of this embodiment will be described.
[0088]
In the following description, it is assumed that all electrodes on which no image is written are set to 0V or installed.
[0089]
When performing black and white display, as in the first embodiment, black and white display is performed by applying a scanning voltage to the line electrode 42 and applying an image signal voltage to the line electrode 26 according to image information. Do. Thereby, for example, the black and white display shown in FIG.
[0090]
In the case of performing multicolor display, as in the first embodiment, by applying an alternating pulse voltage, the white particles 36 and the black particles 38 hardly exist as shown in FIG. Further, according to the image information, the light emitting element at a predetermined position of the light emitting unit 96A blinks or emits light through the switch 102 under the control of the driving device 100. Thereby, for example, from the black and white display shown in FIG. 16A, the multicolor display portion emits light, blinks, or is colored as shown in FIG. 16B.
[0091]
As described above, by using a colored substrate provided with a light-emitting element as a colored substrate, a more expressive multicolor display can be realized.
[0092]
As in the first embodiment, the colored substrate 98 can be changed to a colored substrate having a different colored pattern and light emitting element arrangement, for example, a colored substrate 98 as shown in FIG.
[0093]
Therefore, the display color in the multicolor display can be easily changed, and an image display rich in expressiveness can be performed.
[0094]
【The invention's effect】
As described above, according to the image display device of the present invention, the colored substrate having the colored layer is attached so as to be laminated on the display substrate and the back substrate of the image display medium, and the colored layer of the colored substrate is on the display substrate side. As a result, the colored particles encapsulated inside are moved to the surroundings by applying voltage so that the colored region of the colored substrate can be moved relative to the back substrate. Therefore, it is possible to provide an image display device that can perform multicolor display while maintaining the display quality of the image and can easily change the display.
[Brief description of the drawings]
FIG. 1 shows a schematic configuration of an image display apparatus according to a first embodiment.
FIG. 2 shows an example of a coloring pattern of a colored layer of the colored substrate according to the first embodiment.
FIG. 3 shows an example of a coloring pattern of a colored layer of the colored substrate according to the first embodiment.
FIG. 4 is a block diagram showing an electrical configuration of the image display apparatus according to the first embodiment.
FIGS. 5A and 5B show an example of movement of particles and replacement of a colored substrate of the image display medium according to the first embodiment, in which FIG. 5A shows a state where no electric field is applied, and FIG. A state where an electric field is applied, (C) shows a state where the colored substrate is replaced.
6A and 6B show an example of display transition of the image display medium according to the first embodiment. FIG. 6A shows a state where no electric field is applied, and FIG. 6B shows a state where an alternating electric field is applied. (C) shows an example of a display in a state where the colored substrate is replaced.
FIG. 7 is a diagram showing the relationship between the voltage applied to the display medium and the reflection density according to the embodiment of the present invention.
FIG. 8 is a schematic configuration diagram of an image display apparatus according to a second embodiment.
FIGS. 9A and 9B show an example of a coloring pattern of a colored layer of a colored substrate according to the second embodiment. FIG. 9A shows a state where the colored substrate is not rotated, and FIG. It shows a state rotated by a degree.
FIGS. 10A and 10B show an example of movement of particles and replacement of a colored substrate of an image display medium according to the second embodiment, where FIG. 10A shows a state where no electric field is applied, and FIG. A state where an electric field is applied, (C) shows a state where the colored substrate is rotated.
FIGS. 11A and 11B show an example of display transition of the image display medium according to the second embodiment, where FIG. 11A shows a state where no electric field is applied, and FIG. 11B shows a state where an alternating electric field is applied. (C) shows an example of display in a state where the colored substrate is rotated 180 degrees.
FIG. 12 shows a schematic configuration of an image display apparatus according to a third embodiment.
FIGS. 13A and 13B show an example of display transition of the image display medium according to the third embodiment, in which FIG. 13A shows a state where an alternating electric field is applied and rolls are not fed, and FIG. 13B shows a colored substrate; Is an example of the display of the state in which the roll is fed.
FIG. 14 is a schematic configuration diagram of an image display apparatus according to a fourth embodiment.
FIG. 15 shows an example of a light emitting portion and a colored layer of a colored substrate according to a fourth embodiment.
FIGS. 16A and 16B show an example of display transition of an image display medium according to the fourth embodiment, where FIG. 16A shows an example of black and white display, and FIG. 16B shows an example of a colored display.
[Explanation of symbols]
10 Image display device
12 Image display media
16 Mounting member
24 Display board
26 Line-shaped electrode
30 Back substrate
36 white particles
38 black particles
42 Line-shaped electrode

Claims (5)

A display substrate having at least translucency, an at least translucent back substrate facing the display substrate with a gap, and an electric field formed by a voltage applied between the display substrate and the back substrate. And at least one colored particle group encapsulated movably between the substrates, and an image display medium comprising:
At least a part of a colored substrate including a colored region of a color different from the color of the colored particle group on the back substrate side, and attachment means that can be attached to the display substrate and the back substrate,
Voltage applying means for applying a voltage for generating an electric field for moving the colored particle group between the substrates with respect to the image display medium;
An image display device comprising: The image display apparatus according to claim 1, wherein the attachment unit is capable of attaching the colored substrate so that the colored region is movable with respect to the rear substrate. The colored substrate is formed in a sheet shape, and the attachment means stores storage means for storing the colored substrate in a roll shape, and at least a part of the sheet-like colored substrate stored in the storage means and the display substrate. The image display device according to claim 1, wherein the image display device comprises a holding unit that holds the back substrate so as to be laminated. The said attaching means is comprised from the assembling means which attaches the said colored substrate rotatably in the direction along a colored substrate surface, and the rotating means which rotates the said colored substrate, The Claim 1 or Claim 2 comprised. Image display device. The image display apparatus according to claim 1, wherein the colored substrate includes a light emitting element.

Images