JP2011180536A - Display sheet, display device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display sheet capable of performing color display, displaying a clear and bright white color and, thereby, demonstrating high contrast, and to provide a display device and an electronic apparatus using the display sheet. <P>SOLUTION: The display device 20 has a display layer 400 provided with a plurality of cells 410 in which a dispersion liquid 100 made by dispersing first particles 5 having white color and being charged positively or negatively and second particles 6 having a color different from the first particles 5 and being charged in the polarity opposite to the first particles 5 into a dispersant 7 having a color in relation of the complemental color with the second particles 6 is filled, wherein, by selecting an electric field pattern to be operated to the cells 410, the first particles 5 and the second particles 6 are moved, positions of the first particles 5 and the second particles 6 in the cells 410 are controlled and, thereby, the color in the cells 410 visually recognized from a display surface 121 disposed on the one side of the display layer 400 is changed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display sheet, a display device, and an electronic apparatus.

For example, an electrophoretic display using particle electrophoresis is known as an image display unit of electronic paper (see, for example, Patent Document 1). The electrophoretic display has excellent portability and power saving, and is particularly suitable as an image display unit for electronic paper.
Patent Document 1 discloses an electrophoretic display device that has a pair of electrodes (a common electrode and a plurality of pixel electrodes) arranged opposite to each other and a plurality of divided cells provided therebetween, and is capable of full color display. Are listed. In this electrophoretic display device, one pixel is composed of three divided cells adjacent to each other. Specifically, one divided cell is filled with a dispersion liquid in which red electrophoretic particles are dispersed in a cyan dispersion medium, and the other one divided cell is filled with green electrophoretic particles. Is dispersed in a magenta dispersion medium, and the remaining one divided cell is filled with a dispersion liquid in which blue electrophoretic particles are dispersed in a yellow dispersion medium. . In each divided cell in one pixel, the state of the electrophoretic particles (e.g., uneven distribution position) is controlled so that a desired color is expressed in the one pixel.

  In the electrophoretic display device described in Patent Document 1, white is displayed by a predetermined pixel as follows. That is, in one of the three divided cells constituting the predetermined pixel, the red electrophoretic particles are moved to the common electrode side to display red, and in the other one divided cell, green electricity is displayed. The electrophoretic particles are moved to the common electrode side to display green color, and in the remaining one divided cell, the blue electrophoretic particles are moved to the common electrode side to display blue color, and these red, green and blue are synthesized. To display white.

As described above, in the electrophoretic display device described in Patent Document 1, light is reflected by the red electrophoretic particles, the green electrophoretic particles, and the blue electrophoretic particles, thereby displaying white in a predetermined pixel. However, these three electrophoretic particles have a lower reflectance than white electrophoretic particles. Therefore, white brightness displayed by reflecting light by red electrophoretic particles, green electrophoretic particles, and blue electrophoretic particles is displayed by reflecting light by white electrophoretic particles. Low compared to white brightness.
Therefore, the electrophoretic display device described in Patent Document 1 can perform color display, but cannot display a clear and bright white color and cannot exhibit high contrast.

JP 2009-104215 A

  An object of the present invention is to provide a display sheet that can perform color display and can exhibit high contrast by enabling display of a clear and bright white color, and a display device and an electronic apparatus using the display sheet. It is in.

Such an object is achieved by the present invention described below.
The display sheet of the present invention includes first particles that are white and are charged positively or negatively, and second particles that are different in color from the first particles and are charged on the opposite pole of the first particles. A display layer having a plurality of filling parts filled with a dispersion liquid dispersed in a dispersion medium having a color complementary to the color of the second particles;
By selecting an electric field pattern to be applied to each of the plurality of filling parts, the first particles and the second particles are moved, and the first particles and the second particles in the filling part By controlling a position, it is comprised so that the color in these several filling parts visually recognized from the display surface provided in the one side of the said display layer may be changed.
As a result, it is possible to provide a display sheet that can perform color display and can exhibit high contrast by enabling display of a clear and bright white color.

In the display sheet of the present invention, by selecting the electric field pattern, the first particles are unevenly distributed on the display surface side of the filling portion to display the color of the first particles on the display surface. A color display state, a second color display state in which the second particles are unevenly distributed on the display surface side of the filling portion to display the color of the second particles on the display surface, and in the dispersion medium It is preferable that any one of the third color display states in which the second particles are dispersed to display the mixed color of the second particles and the dispersion medium on the display surface can be selected. .
Thereby, color display can be performed.

In the display sheet of the present invention, in the third color display state, it is preferable that the first particles are unevenly distributed on the side opposite to the display surface of the filling portion.
Thereby, it can be set as the clearer 3rd color display state (namely, the state where black with a lower reflectance was displayed).
In the display sheet of the present invention, the mobility of the first particles in the dispersion medium is preferably lower than the mobility of the second particles in the dispersion medium.
Thereby, in the third color display state, the first particles can be unevenly distributed on the side opposite to the display surface of the filling portion.

In the display sheet of the present invention, in the third color display state, the second particles are dispersed on the display surface side in the dispersion medium, and the first particles are in the dispersion medium. Are preferably dispersed on the side opposite to the display surface.
Thereby, it can be set as a clear 3rd color display state (namely, the state where black with a lower reflectance was displayed).

In the display sheet of the present invention, by selecting the electric field pattern, the first particles and the second particles are further unevenly distributed in a central portion of the filling portion or on the side opposite to the display surface. It is preferable that a fourth color display state for displaying the color of the dispersion medium can be selected.
Thereby, more colors can be displayed.

In the display sheet of the present invention, one pixel is constituted by at least three of the plurality of filling portions.
The first filling part included in the at least three filling parts is filled with the dispersion liquid obtained by dispersing the first particles and the red second particles in the cyan dispersion medium. The second filling part is filled with the dispersion liquid obtained by dispersing the first particles and the green second particles in the magenta dispersion medium, and the third filling part Is preferably filled with the dispersion obtained by dispersing the first particles and the blue second particles in the yellow dispersion medium.
Thereby, full color display can be performed and the outstanding display characteristic can be exhibited.

In the display sheet of the present invention, one pixel is constituted by at least three of the plurality of filling portions.
The first filling part included in the at least three filling parts is filled with the dispersion liquid in which the first particles and the cyan second particles are dispersed in the red dispersion medium. The second filling part is filled with the dispersion liquid in which the first particles and the magenta second particles are dispersed in the green dispersion medium, and the third filling part Is preferably filled with the dispersion liquid in which the first particles and the yellow second particles are dispersed in the blue dispersion medium.
Thereby, full color display can be performed and the outstanding display characteristic can be exhibited.

In the display sheet of the present invention, in the pixel, the color of the second particles present in any one of the first filling portion, the second filling portion, and the third filling portion. Is displayed, the filling unit that accommodates the second particles of the displayed color displays the color of the second particles, and the other filling unit displays the color of the first particles or It is preferable to display a mixed color of the color of the second particles and the color of the dispersion medium.
Thereby, the color of the second particle can be clearly displayed. Also, display the white color (first particle color) in the other two cells, or display white color on one side and black color (mixed color of the second particle color and dispersion medium color) on the other side. By selecting whether to display black or both, it is possible to display red with different brightness.

In the display sheet of the present invention, whether to display the color of the first particles or the mixed color of the color of the second particles and the color of the dispersion medium is displayed in the other filling portion. The selection is preferably based on the amount of light incident on the display layer via the display surface.
Thereby, an image suitable for the use environment, that is, an image that is easy for the user to visually recognize can be displayed.

In the display sheet of the present invention, in the pixel, the color of the second particles present in any one of the first filling portion, the second filling portion, and the third filling portion. Is displayed, the filling unit containing the second particles of the displayed color displays the color of the second particle, and the other filling unit displays the color of the dispersion medium. It is preferable.
Thereby, the color of the 2nd particle of the excellent hue can be displayed.

The display device of the present invention includes the display sheet of the present invention.
As a result, it is possible to provide a display device that can perform color display and can exhibit high contrast by enabling display of clear and bright white.
An electronic apparatus according to the present invention includes the display device according to the present invention.
Accordingly, it is possible to provide an electronic apparatus that can perform color display and can exhibit high contrast by enabling display of clear and bright white.

It is sectional drawing which shows 1st Embodiment of the display apparatus of this invention. It is a top view of the display apparatus shown in FIG. FIG. 2 is an enlarged cross-sectional view illustrating one pixel of the display device illustrated in FIG. 1. It is sectional drawing which shows the action | operation of the display apparatus shown in FIG. It is sectional drawing which shows the action | operation of the display apparatus shown in FIG. It is sectional drawing which shows the action | operation of the display apparatus shown in FIG. It is a figure which shows the waveform of the voltage applied when changing from the state of FIG. 5 to the state of FIG. It is sectional drawing which shows the action | operation of the display apparatus shown in FIG. It is sectional drawing which shows the action | operation of the display apparatus shown in FIG. It is sectional drawing which shows 2nd Embodiment of the display apparatus of this invention. It is a top view which shows 3rd Embodiment of the display apparatus of this invention. It is a perspective view which shows embodiment at the time of applying the electronic device of this invention to electronic paper. It is a figure which shows embodiment at the time of applying the electronic device of this invention to a display.

Hereinafter, a display sheet, a display device, and an electronic device of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
1. Display Device First, a display device incorporating the display sheet of the present invention will be described.
<First Embodiment>
1 is a cross-sectional view showing a first embodiment of the display device of the present invention, FIG. 2 is a plan view of the display device shown in FIG. 1, and FIG. 3 shows one pixel of the display device shown in FIG. FIG. 4, FIG. 5 and FIG. 6 are sectional views showing the operation of the display device shown in FIG. 1, and FIG. 7 is a voltage applied when changing from the state of FIG. 5 to the state of FIG. FIGS. 8 and 9 are sectional views showing the operation of the display device shown in FIG. In the following description, for convenience of explanation, the upper side in FIGS. 1, 2, 4, 5, 6, 8, and 9 will be described as “upper” and the lower side as “lower”.

A display device (electrophoretic display device) 20 shown in FIG. 1 includes a display sheet (front plane) 21 and a circuit board (back plane) 22.
As shown in FIG. 1, a display sheet 21 is provided on a substrate 12 having a flat base 2 and a second electrode 4 provided on the lower surface of the base 2, and filled with a dispersion 100. Display layer 400 having a plurality of cells (filling portions) 410 formed thereon.
On the other hand, the circuit board 22 includes a counter substrate 11 including a flat base 1 and a plurality of first electrodes 3 provided on the upper surface of the base 1, and the counter substrate 11 (base 1), for example, And a circuit (not shown) including a switching element such as a TFT.

Hereinafter, the structure of each part is demonstrated sequentially.
The base 1 and the base 2 are each composed of a sheet-like (flat plate) member, and have a function of supporting and protecting each member disposed therebetween. Each of the base portions 1 and 2 may be either flexible or hard, but is preferably flexible. By using the bases 1 and 2 having flexibility, it is possible to obtain a display device 20 having flexibility, that is, for example, a display device 20 useful in constructing electronic paper.

  When each base part (base material layer) 1 and 2 is flexible, the constituent materials thereof are, for example, polyesters such as PET (polyethylene terephthalate) and PEN (polyethylene naphthalate), polyethylene, etc. Polyolefins, modified polyolefins, polyamides, thermoplastic polyimides, polyethers, polyether ether ketones, various thermoplastic elastomers such as polyurethanes and chlorinated polyethylenes, or their main copolymers, blends, polymer alloys, etc. 1 type or 2 types or more of these can be mixed and used.

  The average thicknesses of the bases 1 and 2 are appropriately set depending on the constituent materials, applications, and the like, and are not particularly limited. However, when having flexibility, the average thickness is about 20 μm or more and 500 μm or less. Preferably, it is about 25 μm or more and 250 μm or less. Thereby, size reduction (especially thickness reduction) of the display apparatus 20 can be achieved, aiming at harmony with the softness | flexibility of the display apparatus 20, and intensity | strength.

  The first electrode 3 and the second electrode 4 that form a layer (film shape) are provided on the surfaces of the bases 1 and 2 on the display layer 400 side, that is, on the upper surface of the base 1 and the lower surface of the base 2, respectively. ing. In the present embodiment, the second electrode 4 is a common electrode, and the first electrode 3 is an individual electrode (pixel electrode connected to the switching element) divided in a matrix (matrix). Further, the first electrode 3 is provided corresponding to each cell 410 included in the display layer 400 (so that one first electrode 3 is positioned in one cell 410). Note that the second electrode 4 may also be divided into a plurality of parts in the same manner as the first electrode 3.

The constituent materials of the electrodes 3 and 4 are not particularly limited as long as they are substantially conductive, for example, metal materials such as gold, silver, copper, aluminum or alloys containing these, carbon black, etc. An ionic substance such as NaCl, Cu (CF ₃ SO ₃ ) _{2 in} a matrix resin such as a carbon-based material such as polyacetylene, polyfluorene or a derivative thereof, or a matrix resin such as polyvinyl alcohol or polycarbonate. Various conductive materials such as dispersed ion conductive polymer materials, conductive oxide materials such as indium oxide (IO), indium tin oxide (ITO), fluorine-doped tin oxide (FTO), etc. One or more of these can be used in combination.

The average thickness of the electrodes 3 and 4 is appropriately set depending on the constituent material and application, and is not particularly limited, but is preferably about 0.01 μm or more and 10 μm or less, preferably 0.02 μm or more and 5 μm. More preferably, it is about the following.
Here, among the bases 1 and 2 and the electrodes 3 and 4, the base and the electrode disposed on the display surface side are each transparent, that is, substantially transparent (colorless and transparent, colored and transparent). Or translucent). In the present embodiment, since the surface (upper surface) of the substrate 12 constitutes the display surface 121, at least the base 2 and the second electrode 4 are substantially transparent. Thereby, the state of the particles 5 and 6 in the dispersion liquid 100, that is, the information (image) displayed on the display device 20 can be easily recognized visually from the display surface 121 side.

  In the display sheet 21, a display layer 400 is provided in contact with the lower surface of the second electrode 4. The display layer 400 is configured by arranging a plurality of cells (filling portions) 410 filled (encapsulated) with the dispersion liquid (electrophoretic dispersion liquid) 100 in a matrix. The dispersion liquid 100 is formed by dispersing the first particles 5 and the second particles 6 charged to opposite poles in a dispersion medium (liquid phase dispersion medium) 7.

As shown in FIG. 1, the display layer 400 includes a base body 401 in which a plurality of concave portions 401a are formed in a matrix (matrix shape), and a lid body that is bonded to the base body 401 so as to cover (close) the openings of the concave portions 401a. 402, whereby a plurality of cells 410 are formed.
The substrate 401 has a relatively high insulating property and the impermeability of the dispersion liquid 100. The constituent material of the base 401 is not particularly limited. For example, various resin materials such as an epoxy resin, an acrylic resin, a urethane resin, a melamine resin, and a phenol resin, silica, alumina, titania, and the like. These ceramic materials can be used, and one or more of them can be used in combination.

  One lid 402 also has a relatively high insulating property and the impermeability of the dispersion liquid 100. Further, the lid body 402 is substantially colorless and transparent so that the inside of the cell 410 can be visually recognized from the outside of the cell 410. The constituent material of the lid 402 is not particularly limited. For example, polyolefin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, modified polyolefin, polyamide (eg, nylon 6, nylon 66), styrene Various thermoplastic elastomers such as polyvinyl chloride, polyurethane, polyester, fluororubber, chlorinated polyethylene, etc., or copolymers, blends, polymer alloys, etc. mainly composed of these. One or two or more of them can be used in combination.

As shown in FIG. 2, in the display device 20, one pixel Pix is configured by three adjacent cells 410, and a plurality of pixels Pix having such a configuration are arranged in a matrix.
Since each pixel Pix has the same configuration, for convenience of explanation, one pixel Pix will be representatively described below, and description of other pixels Pix will be omitted. In the following, the three cells 410 constituting the pixel Pix are referred to as a first cell 410A, a second cell 410B, and a third cell 410C, and the dispersion liquid 100 filled in the first cell 410A is used as the dispersion liquid. 100A, the dispersion 100 filled in the second cell 410B will be described as the dispersion 100B, and the dispersion 100 filled in the third cell 410C will be described as the dispersion 100C.

  As shown in FIG. 3, the dispersion liquid 100A filled in the first cell 410A is composed of white particles (first particles) 5A forming white and red particles (second particles) 6A forming red are cyan. It is dispersed (suspended) in the dispersion medium 7A. The white particles 5A and the red particles 6A are electrophoretic particles charged to opposite poles. That is, one of the white particles 5A and the red particles 6A is positively charged, and the other particle is negatively charged. The color (cyan) of the dispersion medium 7A in which the white particles 5A and the red particles 6A are dispersed has a complementary color relationship with the color (red) of the red particles 6A.

  Further, the dispersion liquid 100B filled in the second cell 410B is a dispersion medium 7B in which white particles (first particles) 5B forming white and green particles (second particles) 6B forming green are magenta. (Dispersed). The white particles 5B and the green particles 6B are electrophoretic particles charged to opposite poles. That is, one of the white particles 5B and the green particles 6B is positively charged, and the other particle is negatively charged. Further, the color (magenta) of the dispersion medium 7B in which the white particles 5B and the green particles 6B are dispersed has a complementary color relationship with the color (green) of the green particles 6B.

In addition, the dispersion liquid 100C filled in the third cell 410C is a dispersion medium 7C in which white particles (first particles) 5C forming white and blue particles (second particles) 6C forming blue are made yellow. (Dispersed). The white particles 5C and the blue particles 6C are electrophoretic particles charged to opposite poles. That is, one of the white particles 5C and the blue particles 6C is positively charged, and the other particle is negatively charged. The color (yellow color) of the dispersion medium 7C in which the white particles 5C and the blue particles 6C are dispersed has a complementary color relationship with the color (blue) of the blue particles 6C.
Dispersion of these electrophoretic particles (white particles 5A, 5B, 5C, red particles 6A, green particles 6B, and blue particles 6C; the same shall apply hereinafter) in the dispersion medium 7 (7A, 7B, and 7C) is, for example, a paint shaker method, One or two or more of ball mill method, media mill method, ultrasonic dispersion method, stirring dispersion method and the like can be used.

  As the dispersion medium 7 (7A, 7B and 7C), a material having low solubility in the base 401 and the lid 402 and having a relatively high insulating property is preferably used. Examples of the dispersion medium 7 include various types of water (for example, distilled water, pure water, etc.), alcohols such as methanol, cellosolves such as methyl cellosolve, esters such as methyl acetate, ketones such as acetone, pentane and the like. Aliphatic hydrocarbons (liquid paraffin), cyclohexane and other alicyclic hydrocarbons, benzene and other aromatic hydrocarbons, methylene chloride and other halogenated hydrocarbons, pyridine and other aromatic fluorinated rings, Nitriles such as acetonitrile, amides such as N, N-dimethylformamide, carboxylates or other various oils can be used, and these can be used alone or as a mixture.

  Among these, as the dispersion medium 7, an aliphatic hydrocarbon (liquid paraffin) or a material mainly composed of silicone oil is preferable. The dispersion medium 7 mainly composed of liquid paraffin or silicone oil is preferable because it has a high effect of suppressing aggregation of electrophoretic particles and has low affinity (low solubility) with the constituent material of the cell 410. Thereby, it can prevent or suppress more reliably that the display performance of the display apparatus 20 deteriorates with time. In addition, liquid paraffin or silicone oil is preferable from the viewpoint of excellent weather resistance and high safety because it does not have an unsaturated bond.

In the present embodiment, in order to color the dispersion media 7A, 7B, and 7C into cyan, magenta, and yellow, respectively, the dispersion media 7A, 7B, and 7C are, for example, anthraquinone dyes and azo dyes. Various dyes such as indigoid dyes are appropriately dissolved.
In addition, in the dispersion medium 7, for example, an electrolyte, a surfactant such as an alkenyl succinate (anionic or cationic), a metal soap, a resin material, a rubber material, an oil, a varnish, You may make it add various additives, such as charge control agents consisting of particles, such as a compound, dispersing agents, such as a silane coupling agent, a lubricant, and a stabilizer.

  The electrophoretic particles are particles that are charged and can be electrophoresed in the dispersion medium 7 by the action of an electric field. Any electrophoretic particles may be used as long as they have a charge. Although not particularly limited, at least one of pigment particles, resin particles, or composite particles thereof is preferably used. Is done. These particles have the advantage that they are easy to manufacture and the charge can be controlled relatively easily.

  Examples of the pigment constituting the pigment particles include black pigments such as aniline black, carbon black, titanium black and copper chromite, white pigments such as titanium oxide and antimony oxide, azo pigments such as monoazo, isoindolinone, Yellow pigments such as yellow lead, red pigments such as quinacridone red and chrome vermilion, blue pigments such as phthalocyanine blue and indanthrene blue, green pigments such as phthalocyanine green, etc. They can be used in combination.

Examples of the resin material constituting the resin particles include acrylic resin, urethane resin, urea resin, epoxy resin, polystyrene, polyester, and the like, and one or more of these are combined. Can be used.
The composite particles include, for example, those in which the surface of the pigment particles is coated with a resin material or other pigment, those in which the surface of the resin particles is coated with a pigment, or a mixture in which the pigment and the resin material are mixed at an appropriate composition ratio. The particle | grains comprised by are mentioned.
Examples of particles obtained by coating the surface of pigment particles with other pigments include those obtained by coating the surface of titanium oxide particles with silicon oxide or aluminum oxide. Such particles include white particles 5A, 5B, It is suitably used as 5C.

The shape of the electrophoretic particles is not particularly limited, but is preferably spherical.
In consideration of the dispersibility in the dispersion medium 7, the smaller electrophoretic particles are preferably used. Specifically, the average particle diameter is preferably about 10 nm or more and 500 nm or less. More preferably, it is about 20 nm or more and 300 nm or less. By setting the average particle diameter of the electrophoretic particles in the above range, aggregation of the electrophoretic particles and sedimentation in the dispersion medium 7 can be surely prevented and dispersed in the dispersion medium 7. Deterioration of display quality of the display device 20 can be suitably prevented.

  In the case of using two different types of particles as in the present embodiment, the average particle sizes of the two types of particles are made different. In particular, the average particle sizes of the white particles 5A, 5B, and 5C are changed to the red particles 6A and green. It is preferable to set larger than the average particle diameter of the particles 6B and the blue particles 6C. Thereby, the display contrast of the display device 20 can be further improved, and the holding characteristics can be improved. Specifically, the average particle diameter of the red particles 6A, the green particles 6B, and the blue particles 6C is about 20 nm to 100 nm, and the average particle diameter of the white particles 5A, 5B, and 5C is about 150 nm to 300 nm. preferable.

  Moreover, it is preferable that the specific gravity of the electrophoretic particles is set to be approximately equal to the specific gravity of the dispersion medium 7. Thereby, even after the application of the voltage between the electrodes 3 and 4 is stopped, the electrophoretic particles can stay in a certain position in the dispersion medium 7 for a long time. That is, a memory property can be given to the display device 20, and displayed information is held for a long time.

2. Method for Operating Display Device Such a display device 20 operates as follows.
When a voltage is applied between the first electrode 3 and the second electrode 4 of the display device 20, an electric field is generated between them. In accordance with this electric field, the electrophoretic particles (white particles 5A, 5B, 5C, red particles 6A, green particles 6B, blue particles 6C) move (electrophoresis) toward one of the electrodes 3 and 4. Hereinafter, the case where positively charged particles are used as the white particles 5A, 5B, and 5C, and negatively charged particles are used as the red particles 6A, the green particles 6B, and the blue particles 6C will be representatively described.

  First, electrophoresis of electrophoretic particles (white particles 5A, red particles 6A) will be described using the first cell 410A. The following “red particles 6A” and “dispersion medium 7A” are replaced with “green particles 6B” and “dispersion medium 7B”, respectively, to thereby electrophoretic particles (white particles 5B, green particles 6B) in the second cell 410B. The migration of the electrophoretic particles (white particles 5C, blue particles 6C) in the third cell 410C can be explained by replacing them with “blue particles 6C” and “dispersion medium 7C”. it can.

・ White display state (first color display state)
As shown in FIG. 4, when the first electrode 3 is set to a positive potential, the white particles 5A move to the second electrode 4 side and gather (is unevenly distributed) at the second electrode 4, and the red particles 6A are It moves to the first electrode 3 side and gathers at the first electrode 3 (is unevenly distributed). For this reason, when the first cell 410A is viewed from the display surface 121 side of the display device 20, the white color, which is the color of the white particles 5A, can be seen (this state is also referred to as “white display state”).
In the specification of the present application, “uneven distribution” means that a plurality of white particles 5A (red particles 6A) are brought into contact with the inner wall of the cell 410 or other particles, so that the movement in the immediately preceding movement direction is substantially performed. Says that they are gathering in an incapable state (the same applies below).

・ Red display state (second color display state)
As shown in FIG. 5, when the first electrode 3 is set to a negative potential, the red particles 6A move to the second electrode 4 side and gather (is unevenly distributed) at the second electrode 4, and the white particles 5A are It moves to the first electrode 3 side and gathers at the first electrode 3 (is unevenly distributed). For this reason, when the first cell 410A is viewed from the display surface 121 side of the display device 20, the red color, which is the color of the red particles 6A, can be seen (this state is also referred to as “red display state”).

・ Black display state (third color display state)
For example, in the red display state, the first electrode 3 is set to a positive potential, the white particles 5A are moved to the second electrode 4 side, and the red particles 6A are moved to the first electrode 3 side. Then, due to such movement of the particles, the red particles 6A are dispersed on the upper side (second electrode 4 side) in the first cell 410 as shown in FIG. 6, and the lower side (first electrode 3 side). ), The application of voltage to the first electrode 3 is stopped when the white particles 5A are dispersed. In this state, when the first cell 410A is viewed from the display surface 121 side of the display device 20, black, which is a mixed color of red, which is the color of the red particles 6A, and cyan, which is the color of the dispersion medium 7A, is visible. (This state is also referred to as “black display state”).
In the specification of the present application, “dispersion” means that the plurality of white particles 5A (red particles 6A) are substantially separated in the cell 410, that is, in a state where they can move in the immediately preceding movement direction. Says that it is scattered evenly.

Note that the voltage (potential) applied to the first electrode 3 to change from the red display state to the black display state is weaker than the voltage (potential) applied to set the white display state. Preferably, the application time is shortened or both. For example, as shown in FIG. 7, when the voltage applied to the first electrode 3 to make the white display state is V1, the voltage is applied to the first electrode 3 to make the black display state from the red display state. The voltage is preferably V2, V3 or V4.
By applying such a voltage, it is possible to prevent the white particles 5A from moving too much while preventing the red particles 6A from moving too much (that is, moving to the first electrode 3). The state of the first cell 410A can be more easily changed from the red display state to the black display state.

  Here, in the black display state, it is preferable to collect the white particles 5A on the first electrode 3 as shown in FIG. Thereby, the dispersion of the white particles 5A in the dispersion medium 7 is prevented, and the color of the white particles 5A is further mixed with black, which is a mixed color of the color of the red particles 6A and the color of the dispersion medium 7A. Can be prevented. Therefore, a clearer black (that is, a black with a lower reflectance) can be displayed in the black display state.

As a method of collecting the white particles 5A on the first electrode 3 in the black display state, for example, the mobility of the white particles 5A (the movement distance per unit time when a predetermined electric field is applied) is determined as the movement of the red particles 6A. A method of lowering the degree is preferable. According to this method, the above-described potential (potential for changing from the red display state to the black display state) is applied to the first electrode 3 in a simple and reliable manner, and the red particles 6A are applied to the second electrode 4. Even when the collected state is changed to the dispersed state in the dispersion medium 7, the white particles 5A having a mobility lower than that of the red particles 6A remain gathered on the first electrode 3 (or slightly the second In a state of moving to the electrode 4 side).
Note that the mobility of the white particles 5A and the red particles 6A depends on the amount of electric charge and the weight of the particles, respectively. Therefore, for the white particles 5A and the red particles 6A, the mobility of the white particles 5A can be easily made lower than the mobility of the red particles 6A by appropriately setting the amount of charge and the weight of the particles. it can.

  In particular, from the viewpoint of collecting the white particles 5A on the first electrode 3 in the black display state and displaying a clearer black color, the specific gravity of the red particles 6A is made equal to the specific gravity of the dispersion medium 7A. It is preferable to make the specific gravity heavier than the specific gravity of the dispersion medium 7A. Thereby, first, the mobility of the white particles 5A can be easily made lower than the mobility of the red particles 6A. Second, a potential for changing from the red display state to the black display state is applied to the first electrode 3, so that even when the white particles 5 </ b> A move to the second electrode 4 side, Since the white particles 5A move (sediment) to the lower side (first electrode 3 side) due to their own weight, the white particles 5A can be more reliably collected on the first electrode 3 in the black display state. . Thirdly, the state in which the red particles 6A are dispersed in the dispersion medium 7 can stay for a long time even after the application of the potential.

  The case where the red display state is changed to the black display state has been described above, but the white display state may be changed to the black display state. In this case, in the white display state, the first electrode 3 is set to a negative potential, the white particles 5A are moved to the first electrode 3 side, and the red particles 6A are moved to the second electrode 4 side. . Then, due to such movement of the particles, as shown in FIG. 6, the red particles 6A are dispersed on the upper side (second electrode 4 side) in the first cell 410, and the lower side (first electrode 3 side). ), The application of the voltage to the first electrode 3 may be stopped when the white particles 5A are dispersed.

-Cyan display state (fourth color display state)
For example, in the red display state, the first electrode 3 is set to a positive potential, the white particles 5A are moved to the second electrode 4 side, and the red particles 6A are moved to the first electrode 3 side. When the movement of the particles causes the red particles 6A and the white particles 5A to be dispersed in the central portion in the first cell 410 as shown in FIG. Stop application of voltage. In this state, when the first cell 410A is viewed from the display surface 121 side of the display device 20, the red particles 6A and the white particles 5A are hardly visually recognized, and the cyan color that is the color of the dispersion medium 7A can be seen ( This state is also referred to as “cyan display state”).
In the cyan display state, as described above, the specific gravity of the white particles 5A is set to be heavier than the specific gravity of the dispersion medium 7A, whereby the red particles 6A are dispersed in the central portion of the cell 410, and the white particles 5A are the first particles. They may be collected on the electrode 3.

  The electrophoretic particles (white particles 5A, red particles 6A) have been described using the first cell 410A. Similarly to the above description, in the second cell 410B, the white display state (first color display state), the green display state (second color display state), and the black display state (third color display state). And a magenta color display state (fourth color display state) can be selected. Also in the third cell 410C, a white display state (first color display state), a blue display state (second color display state), a black display state (third color display state), and a yellow color A display state (fourth color display state) can be selected.

  Next, color display of one pixel Pix composed of the first cell 410A, the second cell 410B, and the third cell 410C capable of such display will be described with reference to Table 1 below. In Table 1, “W” indicates a white display state, “BK” indicates a black display state, “R” indicates a red display state, “G” indicates a green display state, “B” represents a blue display state, “C” represents a cyan display state, “M” represents a magenta color display state, and “Y” represents a yellow color display state.

White Display As shown in Table 1, there are at least three patterns for displaying white on the pixel Pix. Specifically, the pattern (W1) in which each cell 410A, 410B, 410C is in a white display state, the first cell 410A is in a red display state, the second cell 410B is in a green display state, and the third cell A pattern (W2) in which 410C is in a blue display state, a pattern in which the first cell 410A is in a cyan display state, a second cell 410B is in a magenta display state, and a third cell 410C is in a yellow display state (W3).
Of these three patterns (W1) to (W3), the pattern (W1) is preferable in that it can display the clearest and bright white color (that is, the white color having the highest reflectance). That is, an image with high contrast can be displayed by displaying white in the pattern (W1).

-Red display As shown in Table 1, there are at least six patterns for displaying red on the pixel Pix. Specifically, the pattern (R1) in which the first cell 410A is in a red display state, the second cell 410B and the third cell 410C are in a white display state, and the first cell 410A is in a red display state. Patterns (R2) and (R3) in which one of the second cell 410B and the third cell 410C is in a white display state and the other is in a black display state, and the first cell 410A is in a red display state, The second cell 410B and the third cell 410C each have a black display state (R4), the first cell 410A has a red display state, the second cell 410B has a magenta display state, and the third cell The pattern (R5) in which 410C is in a yellow display state, the first cell 410A is in a white display state, the second cell 410B is in a magenta display state, and the third cell And a pattern (R6) to the Le 410C and yellow color display state.

Of the patterns (R1) to (R4), the pattern (R1) can display the brightest red, and the pattern (R4) can display the darkest red. The pattern (R2) and the pattern (R3) can display red having brightness intermediate between the pattern (R1) and the pattern (R4).
In addition, the pattern (R5) can display a red color having the best color (ie, the darkest) among the six patterns. Specifically, the mixed color of the magenta color displayed in the second cell 410B and the yellow color displayed in the third cell 410C is red. For this reason, the red color displayed in the first cell 410A and the red color displayed in the second and third cells 410B and 410C are combined to display a red color having a better color.

Green Display As shown in Table 1, there are at least six patterns for displaying green on the pixel Pix, similar to the red display pattern described above. Specifically, the pattern (G1) in which the second cell 410B is in a green display state, the first cell 410A and the third cell 410C are in a white display state, and the second cell 410B is in a green display state. Patterns (G2) and (G3) in which one of the first cell 410A and the third cell 410C is in a white display state and the other is in a black display state, and the second cell 410B is in a green display state, A pattern (G4) in which the first cell 410A and the third cell 410C are in a black display state, a second cell 410B in a green display state, a first cell 410A in a cyan display state, and a third cell A pattern (G5) in which 410C is in a yellow display state, a second cell 410B is in a white display state, a first cell 410A is in a cyan display state, and a third cell 10C and a pattern (G6) to yellow display state.

Of the patterns (G1) to (G4), the pattern (G1) can display the brightest green, and the pattern (G4) can display the darkest green. The pattern (G2) and the pattern (G3) can display green having brightness intermediate between the pattern (G1) and the pattern (G4).
In addition, the pattern (G6) can display a green color that is most excellent (that is, darkest) among the six patterns. Specifically, the mixed color of the cyan color displayed in the first cell 410A and the yellow color displayed in the third cell 410C is green. For this reason, the green color displayed in the second cell 410B and the green color displayed in the first and third cells 410A and 410C are combined to display a green color with better hue.

Blue Display As shown in Table 1, there are at least six patterns for displaying blue on the pixels Pix, similar to the red display pattern described above. Specifically, the pattern (B1) in which the third cell 410C is in a blue display state, the first cell 410A and the second cell 410B are in a white display state, and the third cell 410C is in a blue display state. Patterns (B2) and (B3) in which one of the first cell 410A and the second cell 410B is in a white display state and the other is in a black display state, and the third cell 410C is in a blue display state, The pattern (B4) in which the first cell 410A and the second cell 410B are in the black display state, the third cell 410C in the blue display state, the first cell 410A in the cyan display state, and the second cell The pattern (B5) in which 410B is set to the magenta color display state, the third cell 410C is set to the white color display state, the first cell 410A is set to the cyan color display state, and the second cell 10B and has a pattern (B6) to magenta display state.

Of the patterns (B1) to (B4), the pattern (B1) can display the brightest blue color, and the pattern (B4) can display the darkest blue color. The pattern (B2) and the pattern (B3) can display a blue color having intermediate brightness between the pattern (B1) and the pattern (B4).
The pattern (B6) can display blue having the best color (ie, the darkest) among the six patterns. Specifically, the mixed color of the cyan color displayed in the first cell 410A and the magenta color displayed in the second cell 410B is blue. Therefore, when the blue color displayed in the third cell 410C and the blue color displayed in the first and second cells 410A and 410B are combined, a blue color having a better color is displayed.

Black Display As shown in Table 1, there are at least one pattern for displaying black on the pixel Pix. Specifically, it has a pattern (BK1) in which each cell 410A, 410B, 410C is in a black display state.

Gray Display As shown in Table 1, there are at least six patterns for displaying gray on the pixel Pix. Specifically, a pattern (GR1), (GR2) in which any one of the first cell 410A, the second 410B, and the third 410C is in a black display state and the other two cells are in a white display state. ), (GR3), and a pattern (GR4) in which any one of the first cell 410A, the second 410B, and the third 410C is in a white display state, and the other two cells are in a black display state. (GR5) and (GR6).
Of the patterns (GR1) to (GR6), the patterns (GR1), (GR2), and (GR3) are gray near white, and the patterns (GR4), (GR5), and (GR6) are gray near black. .

-Display state of other colors Although not shown in Table 1, the pixels Pix can display colors other than those described above. For example, to display a mixed color of red and green, the first cell 410A is set in a red display state, the second cell 410B is set in a green display state, and the third cell 410C is set in a white display state or a black display state. In order to display a mixed color of green and blue, the second cell 410B is in a green display state, the third cell 410C is in a blue display state, and the first cell 410A is in a white display state or a black display state. In order to display a mixed color of blue and red, the third cell 410C is in a blue display state, the first cell 410A is in a red display state, and the second cell 410B is in a white display state or black. The display state may be set.

The color display of the pixel Pix has been described in detail above.
Thus, the display device 20 has a plurality of patterns for displaying each color for each color. In particular, each of the red display, the green display, and the blue display has at least six patterns, and these six patterns have different brightness and color. Therefore, by selecting which pattern to display each color according to the use environment (brightness of use space) and the purpose of use (content of the image to be displayed (for example, a clear image such as a photograph)). The most suitable image (color), that is, an image (color) that is easy for the user to visually recognize can be displayed. For example, regarding red display, if the space in which the display device 20 is used is bright (if the amount of light incident on the display surface 121 is relatively large), dark red is displayed by the pattern (R4), and if dark, It is preferable to display a bright red color by the pattern (R1), and when displaying an image such as a photograph, it is preferable to display a (dark) red color having an excellent hue by the pattern (R5). The same applies to green display and blue display.

  Here, the display device 20 has a light receiving sensor (not shown), and is configured to select a pattern for displaying red, green, blue, and the like based on the amount of light received by the light receiving sensor. Also good. Specifically, for example, two thresholds having different amounts of light (a larger light amount is set as a “first threshold” and a smaller amount is set as a “second threshold”), and the light amount received by the light receiving sensor is set. Is greater than or equal to the first threshold value, red, green and blue are displayed in the patterns (R4), (G4) and (B4), and when the value is greater than or equal to the second threshold value and less than the first threshold value, When the patterns (R2, R3), (G2, G3), (B2, B3) are displayed in red, green, and blue, and less than the first threshold, the patterns (R1), (G1), (B1) It may be configured to display red, green, and blue. The display device 20 is provided with a switch capable of switching the above-described pattern instead of the light receiving sensor so that the user can select the pattern for displaying red, green, blue, etc. by switching the switch with his / her own sense. It may be configured.

  In addition, the display device 20 includes a determination unit that determines the type of image, and is configured to select a pattern for displaying red, green, blue, and the like based on the determination result of the determination unit. May be. Specifically, when the determination unit determines that the displayed image is an image that requires a clear display such as a photograph, red, green in the patterns (R5), (G5), and (B5). , And may be configured to display blue.

  According to the display device 20 configured as described above, full-color display is possible, and clear white (high reflectance) white can be displayed and high contrast can be exhibited. Furthermore, since the display device 20 can display a plurality of types of chromatic colors such as red, green, and blue with different brightness and hue, it can exhibit excellent display characteristics.

Second Embodiment
Next, a second embodiment of the display device of the present invention will be described.
FIG. 10 is a cross-sectional view showing a second embodiment of the display device of the present invention.
Hereinafter, the display device according to the second embodiment will be described with a focus on differences from the above-described embodiments, and description of similar matters will be omitted.
The display device according to the second embodiment of the present invention is the same as the display device of the first embodiment except that the configuration of the dispersion liquid filled in the cells is different. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.

As shown in FIG. 10, the first cell 410A is filled with the dispersion liquid 100A ′, the second cell 410B is filled with the dispersion liquid 100B ′, and the third cell 410C is filled with the dispersion liquid 100A ′. The dispersion 100C ′ is filled.
The dispersion 100A ′ filled in the first cell 410A is a dispersion medium in which white particles (first particles) 5A forming white and cyan particles (second particles) 6A ′ forming cyan are red. Dispersed (suspended) in 7A ′. The white particles 5A and the cyan particles 6A ′ are electrophoretic particles charged to opposite poles. That is, one of the white particles 5A and the cyan particles 6A ′ is positively charged, and the other particle is negatively charged. The color of the dispersion medium 7A has a complementary color relationship with the color of the cyan particles 6A ′.

  Dispersion liquid 100B ′ filled in second cell 410B is a dispersion medium in which white particles (first particles) 5B forming white and magenta particles (second particles) 6B ′ forming magenta are green. It is dispersed (suspended) in 7B ′. The white particles 5B and the magenta color particles 6B 'are electrophoretic particles charged to opposite poles. That is, one of the white particles 5B and the magenta particles 6B 'is positively charged, and the other particle is negatively charged. Further, the color of the dispersion medium 7B 'has a complementary color relationship with the color of the magenta color particle 6B.

Dispersion liquid 100C ′ filled in third cell 410C is a dispersion medium in which white particles (first particles) 5C forming white and yellow particles (second particles) 6C ′ forming yellow are blue. 7C 'dispersed. The white particles 5C and the yellow color particles 6C ′ are electrophoretic particles charged to opposite poles. That is, one of the white particles 5C and the yellow particles 6C ′ is positively charged, and the other particle is negatively charged. Further, the color of the dispersion medium 7C ′ has a complementary color relationship with the color of the yellow color particles 6C ′.
Also by such 2nd Embodiment, the effect similar to 1st Embodiment can be exhibited.

<Third Embodiment>
Next, a third embodiment of the display device of the present invention will be described.
FIG. 11 is a plan view showing a third embodiment of the display device of the present invention.
Hereinafter, the display device according to the third embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.
The display device according to the third embodiment of the present invention is the same as the display device of the first embodiment except that the cell arrangement is different. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.

As shown in FIG. 11, in this embodiment, a plurality of cells 410 having a substantially regular hexagonal cross-sectional shape are arranged in a honeycomb shape. Also, a plurality of first cells 410A, a plurality of second cells 410B, and a plurality of third cells 410C are provided side by side in the vertical direction in FIG. One pixel Pix is configured by three adjacent cells 410A, 410B, 410B. According to such a configuration, since the cells 410 can be arranged densely, a clearer image can be displayed.
According to the third embodiment, the same effect as that of the first embodiment can be exhibited.

  Each of the display devices 20 described above can be incorporated into various electronic devices. As an electronic apparatus of the present invention provided with an electrophoretic display device, for example, an electronic paper, an electronic book, a television, a viewfinder type, a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, an electronic newspaper, Examples include a word processor, a personal computer, a workstation, a videophone, a POS terminal, and a device equipped with a touch panel.

Of these electronic devices, an electronic paper will be described as an example for specific description.
FIG. 12 is a perspective view showing an embodiment when the electronic apparatus of the present invention is applied to electronic paper.
An electronic paper 600 shown in FIG. 12 includes a main body 601 composed of a rewritable sheet having the same texture and flexibility as paper, and a display unit 602. In such electronic paper 600, the display unit 602 includes the display device 20 as described above.

Next, an embodiment when the electronic apparatus of the present invention is applied to a display will be described.
FIG. 13 is a diagram showing an embodiment when the electronic apparatus of the present invention is applied to a display. Among these, (a) in FIG. 13 is a sectional view and (b) is a plan view.
A display (display device) 800 illustrated in FIG. 13 includes a main body 801 and an electronic paper 600 that is detachably attached to the main body 801. The electronic paper 600 has the same configuration as described above, that is, the configuration shown in FIG.

  The main body 801 has an insertion port 805 into which the electronic paper 600 can be inserted on the side (right side in FIG. 13), and two pairs of conveying rollers 802a and 802b are provided inside. When the electronic paper 600 is inserted into the main body 801 through the insertion port 805, the electronic paper 600 is installed in the main body 801 in a state of being sandwiched between the pair of conveyance rollers 802a and 802b.

  A rectangular hole 803 is formed on the display surface side of the main body 801 (the front side in FIG. 13B), and a transparent glass plate 804 is fitted in the hole 803. . Thereby, the electronic paper 600 installed in the main body 801 can be viewed from the outside of the main body 801. That is, in the display 800, the display surface is configured by visually recognizing the electronic paper 600 installed in the main body 801 on the transparent glass plate 804.

In addition, a terminal portion 806 is provided at a leading end portion (left side in FIG. 13) of the electronic paper 600 in the insertion direction, and the terminal is provided inside the main body portion 801 with the electronic paper 600 installed on the main body portion 801. A socket 807 to which the unit 806 is connected is provided. A controller 808 and an operation unit 809 are electrically connected to the socket 807.
In such a display 800, the electronic paper 600 is detachably installed on the main body 801, and can be carried and used while being detached from the main body 801. This improves convenience.

As described above, the display sheet, the display device, and the electronic apparatus according to the present invention have been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each unit may be any arbitrary function having the same function. It can be replaced with that of the configuration. In addition, any other component may be added to the present invention.
In the above-described embodiment, the mode in which each pixel is configured by three cells has been described. However, the present invention is not limited to this. For example, each pixel may be configured by four or more cells. . When each pixel is composed of four or more cells, there are a plurality of at least one of the first cell, the second cell, and the third cell in one pixel. Become.

  DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Base 3 ... 1st electrode 4 ... 2nd electrode 5 ... 1st particle 5A, 5B, 5C ... White particle 6 ... 2nd particle 6A ... Red particle 6A '... Cyan particles 6B ... Green particles 6B' ... Magenta particles 6C ... Blue particles 6C '... Yellow particles 7, 7A, 7A', 7B, 7B ', 7C, 7C' ... Dispersion Medium 100, 100A, 100A ', 100B, 100B', 100C, 100C '... Dispersion 11 ... Counter substrate 12 ... Substrate 121 ... Display surface 20 ... Display device 21 ... Display sheet 22 ... Circuit board 400 ... Display layer 401 ... Base 401a ... Recess 402 ... Lid 410 ... Cell 410A ... First cell 410B ... Second cell 410C ... Third cell 600 ... Electronic paper 60 ... Main body 602 ... Display unit 800 ... Display 801 ... Main body 802a, 802b ... Conveying roller pair 803 ... Hole 804 ... Transparent glass plate 805 ... Insertion slot 806 ... Terminal 807 ... Socket 808 …… Controller 809 …… Operation unit

Claims (13)

The first particles that are white and are positively or negatively charged and the second particles that are different in color from the first particles and are charged to the opposite pole of the first particles are the colors of the second particles. And a display layer having a plurality of filling parts filled with a dispersion liquid dispersed in a dispersion medium of a color complementary to each other,
By selecting an electric field pattern to be applied to each of the plurality of filling parts, the first particles and the second particles are moved, and the first particles and the second particles in the filling part A display sheet configured to change a color in the plurality of filling parts visually recognized from a display surface provided on one side of the display layer by controlling a position.   By selecting the electric field pattern, a first color display state in which the first particles are unevenly distributed on the display surface side of the filling portion and the color of the first particles is displayed on the display surface; A second color display state in which the second particles are unevenly distributed on the display surface side of the filling portion to display the color of the second particles on the display surface, and the second particles are dispersed in the dispersion medium The display sheet according to claim 1, wherein any one of a third color display states in which a mixed color of the second particles and the dispersion medium is displayed on the display surface can be selected.   The display sheet according to claim 2, wherein in the third color display state, the first particles are unevenly distributed on a side opposite to the display surface of the filling portion.   The display sheet according to claim 3, wherein the mobility of the first particles in the dispersion medium is lower than the mobility of the second particles in the dispersion medium.   In the third color display state, the second particles are dispersed on the display surface side in the dispersion medium, and the first particles are on the side opposite to the display surface in the dispersion medium. The display sheet according to claim 2, wherein the display sheet is dispersed.   By selecting the electric field pattern, the first particles and the second particles are further unevenly distributed in the center of the filling portion or on the side opposite to the display surface, so that the color of the dispersion medium is displayed on the display surface. The display sheet according to any one of claims 2 to 5, wherein a fourth color display state to be displayed can be selected. Among the plurality of filling parts, one pixel is constituted by at least three filling parts,
The first filling part included in the at least three filling parts is filled with the dispersion liquid obtained by dispersing the first particles and the red second particles in the cyan dispersion medium. The second filling part is filled with the dispersion liquid obtained by dispersing the first particles and the green second particles in the magenta dispersion medium, and the third filling part 7. The display sheet according to claim 1, wherein the dispersion liquid is formed by dispersing the first particles and the blue second particles in the yellow dispersion medium. . Among the plurality of filling parts, one pixel is constituted by at least three filling parts,
The first filling part included in the at least three filling parts is filled with the dispersion liquid in which the first particles and the cyan second particles are dispersed in the red dispersion medium. The second filling part is filled with the dispersion liquid in which the first particles and the magenta second particles are dispersed in the green dispersion medium, and the third filling part 7. The display sheet according to claim 1, wherein the dispersion liquid is formed by dispersing the first particles and the yellow second particles in the blue dispersion medium. .   In the pixel, when displaying the color of the second particles present in any one of the first filling unit, the second filling unit, and the third filling unit, In the filling unit containing the second particles of the color to be displayed, the color of the second particles is displayed, and in the other filling unit, the color of the first particles or the color of the second particles. The display sheet according to claim 7, wherein a mixed color of the color of the dispersion medium and the color of the dispersion medium is displayed.   Whether to display the color of the first particle or the mixed color of the color of the second particle and the color of the dispersion medium in the other filling unit is displayed via the display surface. The display sheet according to claim 9, wherein the display sheet is selected based on an amount of light incident on the layer.   In the pixel, when displaying the color of the second particles present in any one of the first filling unit, the second filling unit, and the third filling unit, The said filling part which accommodates the said 2nd particle | grains of the said display color displays the color of the said 2nd particle, and displays the color of the said dispersion medium in another filling part. Display sheet.   A display device comprising the display sheet according to claim 1.   An electronic apparatus comprising the display device according to claim 12.

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