JP2013250325A - Image display medium and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To broaden a color gamut to be displayed.SOLUTION: A display medium includes: a display substrate 18 having a display-side transparent electrode 16 and a surface layer 17 deposited on a transparent support substrate 14; a rear substrate 28 disposed to oppose to the display substrate 18 via a gap and having a rear-side electrode 22 and a surface layer 20 deposited on a support substrate 26; first particles 32Y colored into yellow that is one color in colors of cyan, magenta and yellow, which are sealed between the substrates and move in accordance with an electric field between the substrates; second particles 32R colored into red that is one color in colors of red, green and blue, which are sealed between the substrates and have a charging characteristic different from that of the first particles 32Y; suspended particles 32W colored into white, which are sealed between the substrates; and a color filter 30C colored into cyan that is different from the color of the first particles 32Y, in colors of cyan, magenta and yellow, which is disposed on the display substrate 18.

Description

  The present invention relates to an image display medium and an image display device.

  2. Description of the Related Art Conventionally, an image display medium using colored particles is known as an image display medium that has memory characteristics and can be rewritten repeatedly. Such an image display medium includes, for example, a pair of substrates and a plurality of types of particle groups that are sealed between the substrates so as to be movable between the substrates by an applied electric field and have different colors and charging characteristics. Is done.

  In such an image display medium, particles are moved by applying a voltage corresponding to the image between the pair of substrates, and an image is displayed as the contrast of particles of different colors. Further, even after the application of voltage is stopped after the image is displayed, the particles remain attached to the substrate by van der Waals force or mirror image force, and the image display is maintained.

  For example, in the technique described in Patent Document 1, two or three types of moving particles having different colors and charging characteristics, and a void that is colored in the same color as one of the two types of moving particles and in which the moving particles can move are formed. An image display medium provided with a coloring member and a color filter is disclosed.

  In addition, the technique described in Patent Document 2 uses a medium having a hue change range in which the hue is changed by at least modulation means, and configures pixels in a color display device including a color display element having a plurality of pixels. A plurality of sub-pixels that perform color display using a modulation region based on a hue change of the medium, and a color filter of any one of yellow, magenta, and cyan provided in at least one of the plurality of sub-pixels. In addition, a color display device using a hue change range of a medium when displaying three primary colors of red, green, and blue is disclosed.

  The technique described in Patent Document 3 uses a medium having a lightness change range in which the lightness is changed by the modulation means and a medium having a hue change range in which the hue is changed by the modulation means, and a plurality of pixels. In the color display device including the color display element, the pixel of the color display element is a first subpixel that performs color display using a modulation region based on a hue change of the medium, and one of red, green, and blue It is composed of two sub-pixels of the second sub-pixel in which two color filters are arranged, and an electrode for inputting a color output signal is provided to each of the two sub-pixels, and a color output signal from the modulation means is input to the electrodes. As a result, the first sub-pixel is modulated in the hue change range of the medium to display a chromatic color, and the second sub-pixel is modulated in the brightness change range of the medium to give a color shift. Color display device is disclosed for displaying a color filter.

  Furthermore, in the technique described in Patent Document 4, at least one of the cells is composed of a partition wall provided between two transparent substrates, or capsule particles are sandwiched between the substrates, Has a built-in dispersion system in which fine particles are dispersed. By applying an electric field or a magnetic field in a direction parallel to the substrate surface, the dispersion state of the fine particles is changed, and the state of accumulation and dispersion of the fine particles in the cell or capsule is changed. An optical modulation element configured to change the optical transparency perpendicular to the substrate by generating a state is disclosed.

JP 2008-089971 A JP 2006-053498 A JP 2006-053497 A JP 2007-304449 A

  An object of the present invention is to widen the color gamut to be displayed.

  The image display medium according to claim 1, wherein at least one of the pair of substrates has translucency, and charging characteristics that are enclosed between the pair of substrates and move according to an electric field generated between the pair of substrates. The first particles colored in one of cyan, magenta and yellow, and encapsulated between the pair of substrates and having different charging characteristics from the first particles, and red, green, And second particles colored in one color of blue, suspended particles sealed between the pair of substrates and colored in white, and provided on the substrate side corresponding to the display side of the pair of substrates. , A cyan color, a magenta color, and a yellow color filter that is colored in one color different from the first particles.

  The invention according to claim 2 is the invention according to claim 1, wherein the color of the first particles and the color of the second particles are complementary colors.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a second color filter having a color that is a complementary color of the color filter is further provided.

  According to a fourth aspect of the present invention, there is provided the image display medium according to any one of the first to third aspects, a voltage applying unit that applies a voltage between the pair of substrates, and the voltage application according to image information. Control means for controlling the means.

  According to the first aspect of the present invention, there is an effect that the color gamut can be made wider than that of an image display medium provided with three color filters of RGB.

  According to invention of Claim 2, compared with the case where the 2nd particle | grains of this structure are not included, there exists an effect that a black reflectance can be made low.

  According to the third aspect of the present invention, there is an effect that various chromaticity displays are possible as compared with the case where the color of the second color filter of this configuration is not provided.

  According to the fourth aspect of the present invention, there is an effect that the color gamut can be made wider than that of the image display medium including the RGB color filters.

1 is a diagram illustrating a schematic configuration of an image display apparatus according to a first embodiment of the present invention. It is a figure which shows an example of the charging characteristic of the 1st particle | grains and 2nd particle | grains enclosed with the image display medium concerning 1st Embodiment of this invention. (A) is a figure which shows the color pattern which can be displayed with the image display apparatus concerning 1st Embodiment, (B) is chromaticity which shows the hue and saturation which can be displayed with the image display apparatus concerning 1st Embodiment. FIG. (A) is a figure which shows schematic structure of a 1st comparative example, (B) is a figure which shows the color pattern which can be displayed by a 1st comparative example, (C) is the hue which can be displayed by a 1st comparative example. It is a figure which shows chromaticity which shows and saturation. (A) is a figure which shows schematic structure of a 2nd comparative example, (B) is a figure which shows the color pattern which can be displayed by a 2nd comparative example, (C) is the hue which can be displayed by a 2nd comparative example. It is a figure which shows chromaticity which shows and saturation. It is a table | surface which shows the comparison result of each color gamut width, the rewriting speed in 0 degreeC, and a black reflectance of the image display apparatus concerning Embodiment of this invention, a 1st comparative example, and a 2nd comparative example. (A) is a figure which shows schematic structure of the image display apparatus concerning 2nd Embodiment, (B) is a figure which shows the color pattern which can be displayed with the image display apparatus concerning 2nd Embodiment, (C) These are the figures which show the chromaticity which shows the hue and saturation which can be displayed with the image display apparatus concerning 2nd Embodiment. (A) is a figure which shows schematic structure of the image display apparatus concerning 3rd Embodiment, (B) is a figure which shows the color pattern which can be displayed with the image display apparatus concerning 3rd Embodiment, (C) These are the figures which show the chromaticity which shows the hue and saturation which can be displayed with the image display apparatus concerning 3rd Embodiment. (A) is a figure which shows schematic structure of the image display apparatus concerning 4th Embodiment, (B) is a figure which shows the color pattern which can be displayed with the image display apparatus concerning 4th Embodiment, (C) These are figures which show the hue which can be displayed with the image display apparatus concerning 4th Embodiment, and the chromaticity which shows saturation. (A) is a figure which shows schematic structure of the image display apparatus concerning 5th Embodiment, (B) is a figure which shows the color pattern which can be displayed with the image display apparatus concerning 5th Embodiment, (C) These are figures which show the chromaticity which shows the hue and saturation which can be displayed with the image display apparatus concerning 5th Embodiment.

Embodiments of the present invention will be described below with reference to the drawings. Members having the same functions and functions are given the same reference numbers throughout the drawings, and redundant descriptions may be omitted.
(First embodiment)
FIG. 1 is a diagram showing a schematic configuration of an image display apparatus according to the first embodiment of the present invention.

  As shown in FIG. 1, the image display device 10 includes an image display medium 12 and a drive device 11 that drives the image display medium 12. The driving device 11 includes a voltage application unit 40 that applies a voltage between the display-side electrode 16 and the back-side electrode 22 of the image display medium 12, and a voltage application unit 40 according to image information to be displayed on the image display medium 12. The control part 42 to control and the image storage part 44 which memorize | stores the image information showing the image which should be displayed on the image display apparatus 10 are comprised.

  The image display medium 12 is disposed so as to face a display substrate 18 formed by laminating a transparent display-side electrode 16 and a surface layer 17 on a transparent support substrate 14 with a gap from the display substrate 18. The side electrode 22 and the surface layer 20 have the image display medium 12 comprised by the back substrate 28 formed by laminating | stacking on the support substrate 26. FIG. In the present embodiment, an example in which the display-side electrode 16 is a common electrode and grounded and a plurality of back-side electrodes 22 are provided corresponding to the pixels will be described. However, the present invention is not limited to this. You may make it provide the display side electric power 16 corresponding to a pixel by making the side electrode 22 into a common electrode. In addition, the display-side electrode 16 and the back-side electrode 22 may be so-called simple matrix driving as a striped electrode group orthogonal to each other.

  Further, between the display substrate 18 and the back substrate 28, a dispersion medium 24 made of, for example, an insulating liquid and a plurality of types of particles 32 dispersed in the dispersion medium 24 are enclosed. The plurality of types of particles 32 are each colored in a predetermined color and made into a particle group including particles having charging characteristics, and a voltage applied between a pair of substrates of the display substrate 18 and the back substrate 28 is applied. By controlling, particles having charging characteristics migrate between the substrates.

  In the present embodiment, the plurality of types of particles 32 have charging characteristics that move according to the electric field between the pair of substrates, and one color among cyan (C), magenta (M), and yellow (Y). The first particles 32Y colored in yellow (Y) and the first particles 32Y have different charging characteristics and are red in one color among red (R), green (G), and blue (B) Between the pair of substrates, the second particles 32R colored in (R) and the floating particles 32W that are colored in white different from the first particles 32Y and the second particles 32R and float without having charging characteristics. It is enclosed.

  Further, on the display substrate 18, a color filter 30C colored in cyan (C) different from the first particles 32Y among the cyan (C), magenta (M), and yellow (Y) is laminated. ing. In the present embodiment, as shown in FIG. 1, there are pixels on which the color filter 32C is stacked and pixels on which the color filter 32C is not stacked, each being a sub-pixel, and one sub-pixel with two sub-pixels. Configure.

  On the other hand, the driving device 11 controls the voltage applied between the display-side electrode 16 and the back-side electrode 22 of the image display medium 12 according to the color to display, whereby the first particles 32Y and the second particles having charging characteristics are controlled. 32R is migrated and attracted to either the display substrate 18 or the back substrate 28 according to the respective charging polarities.

  The voltage application unit 40 is electrically connected to the display side electrode 16 and the back side electrode 22, respectively. The voltage application unit 40 is connected to the control unit 42 so as to exchange signals.

  An image storage unit 44 that stores image information representing an image to be displayed on the image display device 10 is connected to the control unit 42. Moreover, the control part 42 is comprised as a computer, for example. As an example, a computer has a configuration in which a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a nonvolatile memory, and an input / output interface (I / O) are connected via a bus. The voltage application unit 40 is connected to the I / O. In this case, a program for causing the computer to execute processing for instructing the voltage application unit 40 to apply a voltage necessary for displaying each color is written in, for example, a nonvolatile memory, and the CPU reads and executes the program. The program may be provided by a recording medium such as a CD-ROM. Further, an image to be displayed on the image display device 10 and a display image stored in the image storage unit 44 are acquired via various recording media such as a CD-ROM and a DVD and communication means such as a network and stored in the image storage unit 44. You may capture it.

  The voltage application unit 40 is a voltage application device for applying a voltage to the display-side electrode 16 and the back-side electrode 22, and applies a voltage according to the control of the control unit 42 to the display-side electrode 16 and the back-side electrode 22. .

  Details of each member constituting the image display medium 12 in the present embodiment can be generated by using a well-known technique. For example, each member is constituted by using a technique described in Japanese Patent Application Laid-Open No. 2001-31225. You may make it do.

  FIG. 2 is a diagram illustrating an example of charging characteristics of the first particles 32Y and the second particles 32R sealed in the image display medium 12 according to the present embodiment. FIG. 2 shows an example in which the display side electrode 16 is set to the ground (0 V) and the driving voltage is applied to the back side electrode 22. The first particles 32Y and the second particles 32R can set the adhesion force to the substrate by setting the charge amount and the particle diameter (volume average particle diameter).

  In the present embodiment, as described above, the first particles 32Y and the second particles 32R each have a positive charging characteristic. In the present embodiment, the absolute values of the voltages necessary for the first particles 32Y and the second particles 32R to move between the substrates are different from each other, and are set to be in a voltage range that does not overlap.

  Specifically, the first particle 32Y starts to move between the substrates when a voltage equal to or higher than the voltage | Va | is applied between the substrates, and any substrate at the voltage | Vb | (| Va | <| Vb |). It is set so that the first particles 32Y that have moved to adhere.

  On the other hand, the second particle 32R starts to move between the substrates when a voltage equal to or higher than the voltage | Vc | (| Vb | <| Vc |) is applied between the substrates, and the voltage | Vd | (| VC <| Vd |) The second particles 32R that have moved to any of the substrates are set to adhere. In the present embodiment, an example is described in which the first particle 32Y has a smaller voltage range required to move between the substrates than the second particle 32R, but the first particle 32Y may be larger. In the present embodiment, an example is shown in which both the first particles 32Y and the second particles 32R are positively charged. However, the present invention is not limited to this, and both the first particles 32Y and the second particles 32R may be negatively charged. May be charged negatively and the other negatively charged.

  Next, display of each color displayed on the image display apparatus 10 according to the first embodiment of the present invention will be described.

  In the image display device configured as described above, various colors are displayed by the control unit 42 controlling the voltage application unit 40.

  In the present embodiment, when attention is paid to two subpixels, ie, a subpixel without the color filter 30C and a subpixel with the color filter 30C, as shown in FIG. 3A, white / black, yellow / black, white / cyan. Five patterns of color, red / black and white / green are displayed.

  Specifically, when displaying a white color in a subpixel without the color filter 30C, the first particle 32Y and the second particle 32R are applied by applying a voltage of −Vd or less between the substrates of the subpixel. Since it moves to the back substrate 28 side, the white color of the suspended particles 32W is displayed.

  When displaying yellow in a subpixel without the color filter 30C, the voltage Vb is applied between the substrates in a state where white is displayed by applying a voltage of −Vd or less between the substrates of the subpixel. Accordingly, yellow is displayed because the first particles 32Y move to the display substrate 18 side. Note that yellow is displayed in grayscale by applying a voltage between the voltage Va and the voltage Vb in a state where white is displayed.

  When displaying red in the sub-pixel without the color filter 30C, the first particle 32Y and the second particle 32R are moved to the display substrate 18 side by applying a voltage equal to or higher than the voltage Vd between the substrates of the pixel. After that, by applying the voltage −Vb, the first particles 32Y move to the back substrate 28 side, so that the red color of the second particles 32R attached to the display substrate 18 side is displayed. At this time, by applying a voltage between −Vc and −Vd, red is displayed in grayscale.

  When displaying an arbitrary color mixture of the first particles 32Y and the second particles 32R, 1) a voltage of −Vd or less is applied to move the first particles 32Y and the second particles 32R to the back substrate 28 side. 2) Apply a voltage in the range of Vc to Vd to display the desired gradation of the second particle 32R. 3) Apply a voltage in the range of -Va to -Vb to apply the first particle 32Y. A series of voltage application is performed to display a desired gradation. In this way, following the reset, by sequentially driving the particles having the largest absolute value of the voltage necessary for moving between the substrates and the next largest particle, an arbitrary intermediate color is displayed in gradation.

  On the other hand, when displaying black in a subpixel having a color filter 30C, a voltage equal to or higher than the voltage Vd is applied between the substrates of the subpixel, whereby the first particles 32Y and the second particles 32R are placed on the display substrate 18 side. Since the first particles 3Y are moved to the back substrate 28 side by applying the voltage -Vb after moving to, the red color of the second particles 32R and the cyan color of the color filter 30C have a complementary relationship. Black color is displayed.

  When displaying a cyan color in a certain subpixel with the color filter 30C, the first particle 32Y and the second particle 32R are placed on the rear substrate 28 side by applying a voltage of −Vd or less between the substrates of the subpixel. Therefore, the white color of the suspended particles 32 </ b> W is observed from the display substrate 18 side. However, since there is the color filter 30 </ b> C, the cyan color of the color filter 30 </ b> C is displayed.

  In the case where the color filter 32C displays green in a subpixel, the first particle 32Y is applied by applying a voltage Vb between the substrates after applying a voltage of −Vd or less between the substrates of the subpixel. Since it moves to the display substrate 18 side, green is displayed by yellow of the first particles 32Y and cyan of the color filter 30C.

  Similarly to the case without the color filter 32C, the subpixels with the color filter 32C are sequentially driven with the particles having the largest absolute value of the voltage necessary for moving between the substrates following the reset, and the next largest particles. By doing so, an arbitrary intermediate color is displayed in gradation.

  As described above, in this embodiment, six colors are displayed in two pixels, ie, a sub-pixel without the color filter 30C and a sub-pixel with the color filter 30C. The chromaticity indicating the hue and saturation that can be displayed in the present embodiment is as shown in FIG. The gradation display of the six intermediate colors is ignored here for simplicity.

  Here, a comparative example for comparison with a color gamut that can be displayed by the image display apparatus 10 according to the present embodiment will be described.

  4A is a diagram illustrating a schematic configuration of the first comparative example, FIG. 4B is a diagram illustrating color patterns that can be displayed in the first comparative example, and FIG. 4C is a diagram illustrating the first comparison. It is a figure which shows the chromaticity which shows the hue and saturation which can be displayed in an example. 5A is a diagram showing a schematic configuration of the second comparative example, FIG. 5B is a diagram showing color patterns that can be displayed in the second comparative example, and FIG. It is a figure which shows the chromaticity which shows the hue and saturation which can be displayed in 2 comparative examples.

  In the first comparative example, white particles 32W and black particles 32K each having charging characteristics are sealed between substrates, a color filter 30 is provided from the display substrate 18 side, a sub-pixel having a red color filter 30R, and a green color An image display device in which a unit is a sub-pixel having a filter 30G, a sub-pixel having a blue color filter 30B, and a sub-pixel having no color filter 30 is shown.

  In the first comparative example, full color display is performed by the color filter 30 by the movement of the white particles 32W and the black particles 32K. As a color display pattern for each pixel, as shown in FIG. 4B, red / green / blue / white, red / black / black / black, black / black / blue / black, black / green / black. / Black, red / green / black / black, black / green / blue / black, red / black / blue / black, black / black / black / black, and eight colors that can be displayed in the first comparative example The chromaticity indicating the degree is as shown in FIG.

  On the other hand, in the second comparative example, colored particles 32C, 32M, and 32Y colored in cyan, magenta, and yellow, each having different charging characteristics, are sealed between the substrates, and white as in the first embodiment. An image display device in which 32 W of suspended particles are enclosed is shown.

  In the second comparative example, full color display is performed by the cyan, magenta, and yellow of the colored particles 32. As the color display pattern, as shown in FIG. 5B, eight colors of white, red, green, blue, yellow, magenta, cyan, and black are displayed, and hues that can be displayed in the second comparative example The chromaticity indicating the saturation is as shown in FIG.

  As in the first embodiment, following the reset, by sequentially driving the particles having the largest absolute value of the voltage necessary for moving between the substrates, the next largest particle, and the smallest particle, an arbitrary intermediate color can be obtained. Gradation display is possible. In the first embodiment, the driving is completed in three steps, but in the second comparative example, four steps are required, so that the rewriting speed is slower than in the first embodiment.

  FIG. 6 is a table showing comparison results of the color gamut width, the rewriting speed at 0 ° C., and the black reflectance of the image display device, the first comparative example, and the second comparative example according to the embodiment of the present invention. It is.

  As shown in FIG. 6, the second comparative example has the widest color gamut, but in the second comparative example, the number of colored particles 32 is large, so the number of steps for driving is large and the temperature is particularly low (for example, , 0 ° C.), as the viscosity of the dispersion medium increases, the time required for each step becomes longer, and thus the rewriting speed decreases significantly.

  In the first comparative example, since the number of the colored particles 32 is two and the number of steps for driving is small, the rewriting speed is fast. However, since one pixel is composed of four subpixels, the color becomes dark, and as a result The area becomes narrow.

On the other hand, in the first embodiment, the first particles 32Y colored in one color yellow (Y) among cyan (C), magenta (M), and yellow (Y), and the first The second particles 32R having different charging characteristics from the particles 32Y and colored in one color red (R) among red (R), green (G), and blue (B), the first particles 32Y and A color that is colored white that is different from the second particles 32R and that floats without having charging characteristics, and a cyan (C) color that is one of the CMY colors different from the first particles 32Y. With the configuration including the filter 30C, the color gamut is wider than that of the first comparative example. Although the color gamut is narrower than that of the second comparative example, the rewriting speed is higher than that of the second comparative example because the number of types of the colored particles 32 is small and the number of steps for driving is small. In other words, in order to reduce the types of the colored particles 32 in order to increase the rewriting speed, the color gamut is prevented by reducing the color gamut due to the decrease in the types of the colored particles 32 by configuring as in the first embodiment. Can be spread.
(Second Embodiment)
Next, an image display apparatus according to the second embodiment of the present invention will be described. FIG. 7A is a diagram showing a schematic configuration of the image display device according to the second embodiment, and FIG. 7B is a diagram showing color patterns that can be displayed by the image display device according to the second embodiment. FIG. 7C is a diagram showing chromaticity indicating hue and saturation that can be displayed by the image display apparatus according to the second embodiment.

  In the first embodiment, the first particles 32Y colored yellow of any one of cyan (C), magenta (M), and yellow (Y), and red (R) and green (G). The second particles 32R colored in one of the red colors of blue (B) are encapsulated. In this embodiment, the color of the first particles and the second particles are different from those of the first embodiment. Since a color having a complementary color relationship is selected and the other configurations are the same, detailed description thereof is omitted. Further, the driving method is basically the same as that of the first embodiment, and since it is common in that each color is displayed by sequentially moving from a particle having a large voltage range necessary for moving, detailed description is omitted. .

  Specifically, the image display apparatus according to the second embodiment includes first particles 32C colored in one cyan color among cyan (C), magenta (M), and yellow (Y), Second particles that have different charging characteristics from the first particles 32C and are colored red in a complementary color relationship with the color of the first particles 32C among red (R), green (G), and blue (B). 32R, the first particle 32C, and the second particle 32R are colored in a different color and suspended without having charging characteristics, and the first particle 32C is different in cyan (C), magenta ( M) and a color filter 30Y colored in yellow which is either yellow (Y).

  In the second embodiment configured as described above, when attention is paid to two subpixels, that is, a subpixel without the color filter 30Y and a subpixel with the color filter 30Y, as shown in FIG. Six patterns of cyan / black, black / yellow, red / black, black / green, and black / black are displayed. The chromaticity indicating the hue and saturation that can be displayed by the image display apparatus according to the present embodiment is as shown in FIG.

  When this embodiment is compared with the first comparative example and the second comparative example described above, the result shown in FIG. 6 is obtained. That is, as described above, the second comparative example has the widest color gamut, but the rewriting speed is slow in the second comparative example. In the first comparative example, since the number of the colored particles 32 is smaller than that in the second comparative example, the rewriting speed is fast, but the color gamut is narrow.

  On the other hand, in this embodiment, although the color gamut is narrower than that of the second comparative example, the color gamut is wider than that of the first comparative example. Therefore, in order to reduce the types of the colored particles 32 to be encapsulated in order to increase the rewriting speed, the color gamut is prevented from decreasing due to the decrease in the types of the colored particles 32 by configuring as in the second embodiment. The area can be expanded.

As for the black reflectance, the first comparative example has the lowest black reflectance and is good, but this embodiment has a lower black reflectance than the second comparative example, and has a better result than the first embodiment. can get. That is, by selecting a color that is complementary to the colors of the first particles 32Y and the second particles 32R, the black reflectance is lowered and a good black display is obtained.
(Third embodiment)
Next, an image display apparatus according to the third embodiment will be described. FIG. 8A is a diagram showing a schematic configuration of an image display device according to the third embodiment, and FIG. 8B is a diagram showing color patterns that can be displayed by the image display device according to the third embodiment. FIG. 8C is a diagram showing chromaticity indicating hue and saturation that can be displayed by the image display apparatus according to the third embodiment.

  The third embodiment is a modification of the second embodiment, and the color combinations of the first particles, the second particles, and the color filters are different from those of the second embodiment. Other configurations are the same as described above, and thus detailed description thereof is omitted. Further, the driving method is basically the same as that of the first embodiment, and since it is common in that each color is displayed by sequentially moving from a particle having a large voltage range necessary for moving, detailed description is omitted. .

  Specifically, the image display device according to the third embodiment includes first particles colored in one magenta color (M) of cyan (C), magenta (M), and yellow (Y). 32M and the first particles 32M have different charging characteristics and are colored green, which is complementary to the color of the first particles 32M among red (R), green (G), and blue (B). The second particles 32G, the first particles 32M, and the second particles 32G are colored white and are suspended in a floating particle 32W that does not have charging characteristics, and the first particles 32M have a cyan color (C), And a color filter 30 </ b> C colored in one of magenta (M) and yellow (Y) in cyan.

  In the third embodiment configured as described above, when attention is paid to two subpixels, that is, a subpixel without the color filter 30C and a subpixel with the color filter 30C, as shown in FIG. Six patterns of magenta / black, black / cyan, blue / black, black / green, and black / black are displayed. The chromaticity indicating the hue and saturation that can be displayed by the image display apparatus of the present embodiment is as shown in FIG.

  When this embodiment is compared with the first comparative example and the second comparative example described above, the result shown in FIG. 6 is obtained. That is, as described above, the second comparative example has the widest color gamut, but the rewriting speed is slow in the second comparative example. In the first comparative example, since the number of the colored particles 32 is smaller than that in the second comparative example, the rewriting speed is fast, but the color gamut is narrow.

  On the other hand, in the present embodiment, as in the second embodiment, although the color gamut is narrower than that of the second comparative example, the color gamut is wider than that of the first comparative example. Therefore, in order to reduce the types of the colored particles 32 in order to increase the rewriting speed, the configuration of the third embodiment prevents the color gamut from being reduced due to the reduction in the types of the colored particles 32. Can be spread.

As for the black reflectance, the black reflectance is higher than in the first comparative example, but the color of the first particle 32M and the second particle 32G is selected as a complementary color as in the second embodiment. Therefore, the black reflectance is lower than that of the second comparative example, and a better result than that of the first embodiment is obtained.
(Fourth embodiment)
Next, an image display apparatus according to the fourth embodiment will be described. FIG. 9A is a diagram showing a schematic configuration of an image display device according to the fourth embodiment, and FIG. 9B is a diagram showing color patterns that can be displayed by the image display device according to the fourth embodiment. FIG. 9C is a diagram showing chromaticity indicating hue and saturation that can be displayed by the image display apparatus according to the fourth embodiment.

  The fourth embodiment is also a modification of the second embodiment, and the color combinations of the first particles, the second particles, and the color filters are different from those of the second embodiment. Other configurations are the same as described above, and thus detailed description thereof is omitted. Further, the driving method is basically the same as that of the first embodiment, and since it is common in that each color is displayed by sequentially moving from a particle having a large voltage range necessary for moving, detailed description is omitted. .

  Specifically, the image display device according to the fourth embodiment includes the first particles 32Y colored in one color yellow (Y) among cyan (C), magenta (M), and yellow (Y). In addition, the first particle 32Y has a charging characteristic different from that of the first particle 32Y and is colored blue (B) that is complementary to the color of the first particle 32Y among red (R), green (G), and blue (B). The second particles 32B, the first particles 32Y, and the second particles 32B are colored differently in white and suspended in floating without having charging characteristics, and the first particles 32Y have a cyan color (C ), A color filter 30M colored in one of magenta color (M) and yellow (Y), magenta color (M).

  In the fourth embodiment configured as described above, when attention is paid to two subpixels, that is, a subpixel without the color filter 30M and a subpixel with the color filter 30M, as shown in FIG. 9B, white / black, Six patterns of blue / black, black / red, black / magenta, yellow / black, and black / black are displayed. The chromaticity indicating the hue and saturation that can be displayed by the image display apparatus according to the present embodiment is as shown in FIG.

  When this embodiment is compared with the first comparative example and the second comparative example described above, the result shown in FIG. 6 is obtained. That is, as described above, the second comparative example has the widest color gamut, but the rewriting speed is slow in the second comparative example. In the first comparative example, since the number of the colored particles 32 is smaller than that in the second comparative example, the rewriting speed is fast, but the color gamut is narrow.

  On the other hand, in the present embodiment, as in the second embodiment, although the color gamut is narrower than that of the second comparative example, the color gamut is wider than that of the first comparative example. Furthermore, the color gamut is wider than in the first to third embodiments. Therefore, in order to reduce the types of the colored particles 32 in order to increase the rewriting speed, the configuration of the fourth embodiment prevents the color gamut from being reduced due to the decrease in the types of the colored particles 32. Can be spread.

As for the black reflectance, the black reflectance is higher than in the first comparative example, but the color of the first particle 32Y and the second particle 32B is selected as a complementary color as in the second embodiment. Therefore, the black reflectance is lower than that of the second comparative example, and a better result than that of the first embodiment is obtained.
(Fifth embodiment)
Next, an image display apparatus according to the fifth embodiment will be described. FIG. 10A is a diagram showing a schematic configuration of an image display apparatus according to the fifth embodiment, and FIG. 10B is a diagram showing color patterns that can be displayed by the image display apparatus according to the fifth embodiment. FIG. 10C is a diagram showing chromaticity indicating hue and saturation that can be displayed by the image display apparatus according to the fifth embodiment.

  The fifth embodiment is also a modification of the second embodiment, and further includes a color filter with respect to the second embodiment. Since other configurations are the same as those of the second embodiment, detailed description thereof is omitted. Further, the driving method is basically the same as that of the first embodiment, and since it is common in that each color is displayed by sequentially moving from a particle having a large voltage range necessary for moving, detailed description is omitted. .

  Specifically, the image display apparatus according to the fifth embodiment is similar to the second embodiment in one cyan color (C) of cyan (C), magenta (M), and yellow (Y). ) And the first particles 32C, which have different charging characteristics from the first particles 32C and are complementary to the color of the first particles 32C among red (R), green (G), and blue (B). The second particles 32R colored in red (R) in relation to each other, the floating particles 32W colored in white different from the first particles 32C and the second particles 32R and floating without having charging characteristics, The color filter 30Y is different from the particles 32C, and is colored yellow of any one of cyan (C), magenta (M), and yellow (Y). In the present embodiment, a blue (B) color filter 30B is further laminated on the display substrate 18 as compared with the second embodiment. In the present embodiment, a color in which the two color filters 30Y and 30B have a complementary color relationship is selected.

  In the fifth embodiment configured as described above, when attention is paid to three subpixels, that is, a subpixel without the color filters 30Y and 30B and a subpixel with the color filters 30Y and 30B, as shown in FIG. White / yellow / blue, cyan / black / black, black / yellow / black, red / black / blue, black / black / blue, red / red / black, black / green / black, and black / black / black 8 patterns are displayed. And the chromaticity which shows the hue and saturation which can be displayed with the image display apparatus of this embodiment comes to show in FIG.10 (C).

  When this embodiment is compared with the first comparative example and the second comparative example described above, the result shown in FIG. 6 is obtained. That is, as described above, the second comparative example has the widest color gamut, but the rewriting speed is slow in the second comparative example. In the first comparative example, since the number of the colored particles 32 is smaller than that in the second comparative example, the rewriting speed is fast, but the color gamut is narrow.

  On the other hand, in this embodiment, although the color gamut is narrower than that of the second comparative example, the color gamut is wider than that of the first comparative example. Furthermore, in the present embodiment, the two color filters 30Y and 30B use colors that have a complementary relationship. As a result, as can be seen by comparing FIG. 3C and FIG. 10C, the area surrounded by the dotted line expands and approaches a circle, and various chromaticities and a wide color gamut are displayed.

  Moreover, about a black reflectance, although a 1st comparative example has the lowest black reflectance and it is favorable, it becomes a black reflectance lower than a 2nd comparative example and 1-4th embodiment, and is 1st-4th embodiment. Good results are obtained.

  In the fifth embodiment, a color filter is further provided to the second embodiment and the color of the two color filters is selected as a complementary color. However, the present invention is not limited to this. For example, The first embodiment may be provided with two color filters of complementary colors as in the fifth embodiment. As a result, various chromaticities are displayed.

DESCRIPTION OF SYMBOLS 10 Image display apparatus 11 Drive apparatus 12 Image display medium 14, 26 Support board 16 Display side electrode 18 Display board 22 Back side electrode 28 Back board 30C, 30M, 30Y Color filter 32C, 32M, 32Y First particle 32R, 32G, 32B Second particle 32W Airborne particle

Claims (4)

A pair of substrates, at least one of which is translucent,
A first particle that is sealed between the pair of substrates and has a charging characteristic that moves in response to an electric field generated between the pair of substrates, and is colored in one of cyan, magenta, and yellow; and
Second particles encapsulated between the pair of substrates and having different charging characteristics from the first particles, and colored in one of red, green, and blue, and
Suspended particles sealed between the pair of substrates and colored white;
A color filter provided on a substrate side corresponding to a display side of the pair of substrates and colored in one color different from the first particles among cyan, magenta, and yellow;
An image display medium comprising:   The image display medium according to claim 1, wherein the color of the first particles and the color of the second particles are complementary colors.   The image display medium according to claim 1, further comprising a second color filter of a color that is a complementary color of the color of the color filter. The image display medium according to any one of claims 1 to 3,
Voltage applying means for applying a voltage between the pair of substrates;
Control means for controlling the voltage application means according to image information;
An image display device comprising:

Images