JP4765418B2 - Display device - Google Patents

Description

  The present invention relates to a display device using electrophoresis.

  In recent years, electronic paper that combines the advantages of portable paper and the advantages of a display device capable of rewriting display contents has been widely used. For example, by applying an electric field to white charged particles in a dispersion medium colored black, the particles are moved by electrophoresis to display white or black.

Display devices that perform multicolor display using this electrophoresis have been developed. For example, for each microcapsule, a dispersion medium colored in different colors (Y, M, C or R, G, B) and electrophoretic particles having different electrophoretic mobility are enclosed, and electrophoresis in the microcapsule is performed. A display device that makes particles function as a shutter that blocks colors has been proposed (see, for example, Patent Document 1). This display device performs color display by changing the intensity, direction, and time of the electric field applied to the microcapsules and turning on / off the color for each microcapsule.
JP 2000-194020 A

  However, in the conventional color display using microcapsules, since one capsule displays one color, one pixel is formed by three microcapsules of Y, M, C or R, G, B, and the resolution is low. Depending on the capsule diameter, it was difficult to perform high-resolution color display. Further, the intermediate color becomes a pseudo expression by dither or the like, and there is a problem in color reproducibility.

  The present invention has been made in view of the above problems in the prior art, and an object thereof is to provide a display device capable of high-resolution color display. Another object of the present invention is to improve the expression of intermediate colors.

In order to solve the above-mentioned problem, the invention according to claim 1 is a display device comprising a pair of base materials on which a pair of electrodes are formed which are arranged to be opposed to each other at intervals. A base material at least one of which is transparent, a dispersion medium enclosed between the pair of base materials, electrophoretic particles of a plurality of colors mixed in the dispersion medium and having different mobility and charge amount for each color, only containing the electrophoretic particles, as the mobility is relatively high charge quantity is relatively small, a voltage is applied between the electrodes, most mobility large particles of the electrophoretic particles said transparent By turning off the voltage application between the electrodes while reaching the substrate, the display of the color of the particle with the highest mobility is obtained, and the voltage is applied between the electrodes to move the most of the electrophoretic particles. Large particles reach the transparent substrate After that, by applying voltage between the electrodes in a state where the second highest mobility particle enters the gap between the highest mobility particles, the color of the highest mobility particle and the second A recording display medium capable of displaying a mixed color with the color of particles having high mobility is provided.

  According to the first aspect of the present invention, since the color continuously changes due to the difference in the mobility and charge amount of the electrophoretic particles, high-resolution color display is possible, and the expression of intermediate colors can be improved. it can.

[First Embodiment]
First, the recording display medium 1 of the display device according to the first embodiment of the present invention will be described.
FIG. 1 is a schematic cross-sectional view showing the basic configuration of the recording display medium 1. As shown in FIG. 1, a recording display medium 1 is configured by arranging a plurality of microcapsules 4 between a pair of transparent base material 2 and base material 3 which are spaced from each other and opposed to each other. Yes. Transparent electrodes 5 and electrodes 6 are provided at positions corresponding to the respective microcapsules 4 on the opposite surface side (inner side) of the transparent base material 2 and the base material 3, and an electric field can be applied to each microcapsule 4. It is possible. By applying an electric field, the electrophoretic particles colored yellow, magenta, and cyan in the dispersion medium 7 in the microcapsule 4 are moved, and when the target color is obtained, the electric field is turned off to perform color display. As shown in FIG. 1, when the display surface is viewed from above, the upper transparent substrate 2 and the transparent electrode 5 need to be transparent.

  The microcapsules 4 are prepared by interfacial polymerization methods (JP-B-38-19574, JP-B-42-446, JP-B-42-771, etc.), and phase separation methods from aqueous solutions (US Pat. No. 2,800,547, US Pat. Etc.), monomer polymerization methods (JP-B 36-9168, JP-A 51-9079, etc.), and melt dispersion cooling methods (UK Patent 952807, UK Patent 965074, etc.). is there.

  FIG. 2 is a schematic diagram showing the configuration of the microcapsule 4. As shown in FIG. 2, a white dispersion medium 7 is enclosed in the microcapsule 4, and electrophoretic particles colored yellow (hereinafter referred to as yellow particles) Y and magenta are colored in the dispersion medium 7. Electrophoretic particles (hereinafter referred to as magenta particles) M, electrophoretic particles colored in cyan (hereinafter referred to as cyan particles) C, and electrophoretic particles colored in yellow having the largest charge amount (hereinafter referred to as yellow large particles). This is called charged particles.) Y is mixed.

  The dispersion medium 7 is colored in white with an existing oil-based ink dye or an existing pigment in highly insulating water, alcohol, various esters, various oils, and the like.

  For coloring the electrophoretic particles, existing oil-based ink dyes (azo dyes, anthraquinone dyes, indigo dyes, etc.) or existing pigments (benzidine yellow, benzidine orange, diamond black, etc.) can be used.

  Each electrophoretic particle has a difference in charge amount for each color in advance. Here, as shown in FIG. 3A, the charge amount of yellow particles Y = minimum, the charge amount of magenta particles M = small, the charge amount of cyan particles C = medium, and the charge amount of yellow large charged particles y = large. In order. Note that the difference in charge amount of each electrophoretic particle is relative.

  Each electrophoretic particle has a difference in mobility (electrophoretic mobility) for each color in advance. The mobility refers to the moving speed of the electrophoretic particles in the dispersion medium 7 with respect to a constant electric field. Here, as shown in FIG. 3B, the mobility of yellow particles Y = high, the mobility of magenta particles M = medium, the mobility of cyan particles C = low, and the mobility of yellow large charged particles y = polar. Keep in order of low. Note that the difference in mobility of each electrophoretic particle is relative. The difference in mobility of electrophoretic particles can be caused by the difference in particle material or surface treatment.

  Each electrophoretic particle is negatively charged, and in a steady state, each electrophoretic particle is dispersed in the dispersion medium 7 as shown in FIG. The charge amount of the electrophoretic particles is adjusted according to the type and amount of the charge control agent. A charge control agent is also used to stabilize the charge amount. As described in Japanese Patent Application Laid-Open No. 2003-344881, there are many types of control agents including plus and minus types, and those containing metals, resin types, quaternary ammonium salts, and the like are representative. It is. Further, as described in JP-A-2004-004987, a metal-containing azo compound, a salicylic acid-based metal complex, nigrosine, triphenylmethane, a quaternary ammonium salt, and the like can be used as the charge control agent.

  FIG. 4 shows a state in which the recording display medium 1 is initialized. As shown in FIG. 4, when a voltage is applied with the transparent electrode 5 being negative and the electrode 6 being positive, each electrophoretic particle is negatively charged, so that all electrophoretic particles are attracted to the electrode 6 side. In this state, when the microcapsule 4 is viewed from above, it looks white as the color of the dispersion medium 7.

  When a predetermined voltage is applied from the initialization state shown in FIG. 4 with the transparent electrode 5 being positive and the electrode 6 being negative, as shown in FIG. 5 (a), Y, M, C, The yellow particles Y moving in the order of y in the direction of the transparent electrode 5 and having a mobility of “high” first reach upward. When the voltage between the electrodes is cut in this state, each electrophoretic particle is fixed in the state shown in FIG. 5A, and appears yellow when the microcapsule 4 is viewed from above.

  When a predetermined voltage is applied with the transparent electrode 5 being positive and the electrode 6 being negative from the state shown in FIG. 5A, the magenta particles M having a small charge amount become transparent electrodes as shown in FIG. 5B. 5 is drawn into the gap between the yellow particles Y having the “minimum” charge amount. When the voltage between the electrodes is cut in this state, each electrophoretic particle is fixed in the state shown in FIG. 5B. When the microcapsule 4 is viewed from above, it appears as red, which is a mixed color of yellow and magenta.

  When a predetermined voltage is applied with the transparent electrode 5 being positive and the electrode 6 being negative from the state shown in FIG. 5 (b), the magenta particles M having a small charge amount become transparent electrodes as shown in FIG. 5 (c). 5, it passes through the gap between the yellow particles Y having the “minimum” charge amount and reaches the upper side. When the voltage between the electrodes is turned off in this state, each electrophoretic particle is fixed in the state shown in FIG. 5C, and looks magenta when the microcapsule 4 is viewed from above.

  When a predetermined voltage is applied with the transparent electrode 5 being positive and the electrode 6 being negative from the state shown in FIG. 5C, the cyan particles C having a charge amount of “medium” become transparent electrodes as shown in FIG. 5, it passes through the gap between the yellow particles Y having a smaller charge amount and enters the gap between the magenta particles M. When the voltage between the electrodes is cut in this state, each electrophoretic particle is fixed in the state shown in FIG. 5D, and when viewed from above, the microcapsule 4 looks blue, which is a mixed color of magenta and cyan.

  When a predetermined voltage is applied with the transparent electrode 5 being positive and the electrode 6 being negative from the state shown in FIG. 5 (d), the cyan particles C having a charge amount of “medium” become transparent electrodes as shown in FIG. 5, it passes upward through the gap between the magenta particles M having a small charge amount and reaches the upper side. When the voltage between the electrodes is cut in this state, each electrophoretic particle is fixed in the state shown in FIG. 6A, and appears cyan when the microcapsule 4 is viewed from above.

  When a predetermined voltage is applied with the transparent electrode 5 being positive and the electrode 6 being negative from the state shown in FIG. 6A, yellow large charged particles y having a large charge amount are obtained as shown in FIG. 6B. It is pulled by the transparent electrode 5 and passes through the gap between the yellow particles Y and the magenta particles M having a smaller charge amount and enters the gap between the cyan particles C. When the voltage between the electrodes is cut in this state, each electrophoretic particle is fixed in the state shown in FIG. 6B, and when viewed from above, the microcapsule 4 looks green, which is a mixed color of cyan and yellow.

  When the predetermined voltage is applied with the transparent electrode 5 being positive and the electrode 6 being negative from the state shown in FIG. 6B, yellow large charged particles y having a large charge amount are obtained as shown in FIG. 6C. It is pulled by the transparent electrode 5 and passes upward through the gap between the cyan particles C with the charge amount “medium”. When the voltage between the electrodes is cut in this state, each electrophoretic particle is fixed in the state shown in FIG. 6C, and appears yellow when the microcapsule 4 is viewed from above.

  When the voltage between the electrodes is cut in a state where each color is visible, the position of each electrophoretic particle is maintained by the viscosity of the dispersion medium 7.

  FIG. 7 shows the position of each electrophoretic particle with respect to the time for applying a predetermined voltage between the electrodes, that is, the time for applying a constant electric field to each electrophoretic particle. The electrophoretic particles move upward in descending order of mobility, and the electrophoretic particles having a large charge amount pass upward through the gap between the electrophoretic particles having a smaller charge amount. As shown in FIG. 7, by setting the time for applying a predetermined voltage as Ty, Tr, Tm, Tb, Tc, Tg, and Ty2, yellow, red, magenta, blue, cyan, green, and yellow are expressed, respectively. be able to.

  According to the first embodiment, in addition to yellow, magenta, and cyan, a mixed color of these can be displayed with one microcapsule. Compared to a technique for performing color display using microcapsules for each color. High-resolution color display is possible even with the same capsule diameter. Further, since the color continuously changes according to the time during which an electric field is applied to the electrophoretic particles due to the difference in mobility and charge amount of each electrophoretic particle, it is possible to improve the expression of intermediate colors.

[Second Embodiment]
Next, a second embodiment to which the present invention is applied will be described.
In the first embodiment, the color is changed according to the time during which a constant electric field is applied to the electrophoretic particles, but in the second embodiment, the color is changed according to the strength of the electric field applied to the electrophoretic particles.

  First, the basic principle of the recording display medium 10 of the display device according to the second embodiment will be described. In the recording display medium 10, the same components as those of the recording display medium 1 shown in the first embodiment are denoted by the same reference numerals, and the description of the configuration is omitted.

  FIG. 8 shows a state in which the recording display medium 10 is initialized. As shown in FIG. 8, when a voltage is applied with the transparent electrode 5 being negative and the electrode 6 being positive, each electrophoretic particle is negatively charged, so that all electrophoretic particles are attracted to the electrode 6 side. In this state, when the microcapsule 4 is viewed from above, it looks white as the color of the dispersion medium 7.

  When the transparent electrode 5 is positive and the electrode 6 is negative and the voltage Vy is applied for a predetermined time from the initialization state shown in FIG. 8, the difference in mobility causes Y as shown in FIG. 9 (a). , M, C, and y in the order of the transparent electrode 5, and stops in a state where the yellow particles Y whose mobility is “high” have reached the upper side. In this state, when the microcapsule 4 is viewed from above, it looks yellow.

  Further, when the voltage Vr (Vr> Vy) is applied for a certain time with the transparent electrode 5 being positive and the electrode 6 being negative from the initialization state shown in FIG. 8, the charge amount is reduced as shown in FIG. 9B. The “small” magenta particles M are attracted by the transparent electrode 5 and stop in a state where they enter the gaps between the “very small” yellow particles Y. When the microcapsule 4 is viewed from above in this state, it looks red, which is a mixed color of yellow and magenta.

  When the transparent electrode 5 is positive and the electrode 6 is negative and the voltage Vm (Vm> Vr) is applied for a certain time from the initialization state shown in FIG. 8, the charge amount is reduced as shown in FIG. 9C. The “small” magenta particles M are attracted by the transparent electrode 5 and stop in a state where they pass upward through the gap between the “very small” yellow particles Y having the charge amount. In this state, when the microcapsule 4 is viewed from above, it looks magenta.

  When the transparent electrode 5 is positive and the electrode 6 is negative and the voltage Vb (Vb> Vm) is applied for a certain time from the initialization state shown in FIG. 8, the charge amount is reduced as shown in FIG. 9D. The “medium” cyan particles C are attracted by the transparent electrode 5, pass through the gaps of the yellow particles Y having a smaller charge amount, and stop in a state of entering the gaps of the magenta particles M. In this state, when the microcapsule 4 is viewed from above, it looks blue, which is a mixed color of magenta and cyan.

  Further, when the transparent electrode 5 is positive and the electrode 6 is negative and the voltage Vc (Vc> Vb) is applied for a certain time from the initialization state shown in FIG. 8, the charge amount is reduced as shown in FIG. 10 (a). The “medium” cyan particles C are attracted by the transparent electrode 5 and stop in a state where they pass upward through the gaps of the “small” magenta particles M. In this state, when the microcapsule 4 is viewed from above, it looks cyan.

  Further, when the transparent electrode 5 is positive and the electrode 6 is negative and the voltage Vg (Vg> Vc) is applied for a certain time from the initialization state shown in FIG. 8, the charge amount is reduced as shown in FIG. 10B. The “large” yellow large charged particle y is attracted by the transparent electrode 5, passes through the gap between the yellow particle Y and the magenta particle M having a smaller charge amount, and stops in a state where it enters the gap between the cyan particles C. In this state, when the microcapsule 4 is viewed from above, it looks green, which is a mixed color of cyan and yellow.

  Further, when the voltage Vy2 (Vy2> Vg) is applied for a certain time with the transparent electrode 5 being positive and the electrode 6 being negative from the initialization state shown in FIG. 8, the charge amount is reduced as shown in FIG. “Large” yellow large charged particles y are attracted by the transparent electrode 5, and stop in a state where they pass upward through the gaps between the cyan particles C with the charge amount “medium”. In this state, when the microcapsule 4 is viewed from above, it looks yellow.

  FIG. 11 shows the position of each electrophoretic particle with respect to the magnitude of the voltage applied between the electrodes for a certain period of time. The electrophoretic particles existing above change depending on the magnitude of the voltage applied between the electrodes. That is, the electrophoretic particles present above change according to the strength of the electric field applied to each electrophoretic particle for a certain period of time. As shown in FIG. 11, the voltages applied between the electrodes are set to Vy, Vr, Vm, Vb, Vc, Vg, and Vy2, thereby expressing yellow, red, magenta, blue, cyan, green, and yellow, respectively. be able to.

  According to the second embodiment, in addition to yellow, magenta, and cyan, a mixed color of these can be displayed with one microcapsule. Compared to a technique for performing color display using microcapsules for each color. High-resolution color display is possible even with the same capsule diameter. Further, since the color continuously changes according to the strength of the electric field applied to the electrophoretic particles due to the difference in mobility and charge amount of each electrophoretic particle, it is possible to improve the expression of intermediate colors.

  In the first embodiment, since the voltage application time is used as a parameter, it seems that the color gradually changes when an image of the entire recording display medium is formed. In the embodiment, since the voltage value applied between the electrodes is used as a parameter, all colors appear to appear simultaneously.

[Third Embodiment]
Next, a third embodiment to which the present invention is applied will be described.
In the first embodiment and the second embodiment, the case where the dispersion medium 7 is encapsulated in the plurality of microcapsules 4 and subdivided into cells is described. Good.

  As shown in FIG. 12, the recording display medium 20 of the display device in the third embodiment eliminates the microcapsules 4 of the recording display medium 1 shown in the first embodiment, and the transparent electrodes 5 and 6 The dispersion medium 7 and the electrophoretic particles are directly enclosed between them. In the recording display medium 20, the same components as those of the recording display medium 1 shown in the first embodiment are denoted by the same reference numerals, and the description of the configuration is omitted.

  Further, the process of forming each color is the same as the method shown in the first embodiment (see FIGS. 4, 5, and 6), and thus the description thereof is omitted. Also in the recording display medium 20, as shown in FIG. 7, by setting the time for applying a predetermined voltage between the electrodes as Ty, Tr, Tm, Tb, Tc, Tg, Ty2, respectively, yellow, red, magenta, Blue, cyan, green and yellow can be expressed.

  According to the third embodiment, since the color continuously changes due to the difference in mobility and charge amount of each electrophoretic particle, high-resolution color display is possible, and the expression of intermediate colors can be improved. it can. In addition, since a microcapsule is not necessary, the structure of the device can be simplified. In this case, since the resolution depends on the density of the transparent electrode 5 and the electrode 6, it is not necessary to make fine microcapsules.

  In the third embodiment, the case where each color is expressed by controlling the time for applying an electric field to the electrophoretic particles as in the first embodiment has been described. However, as in the second embodiment. The strength of the electric field applied to the electrophoretic particles may be controlled.

[Fourth Embodiment]
Next, a fourth embodiment to which the present invention is applied will be described.
In the first embodiment, the second embodiment, and the third embodiment, the transparent electrode 5 and the electrode 6 for applying an electric field to each electrophoretic particle are opposed to the transparent substrate 2 and the substrate 3. Although the case where it exists in the side was demonstrated, the electrode may exist in the opposite surface side (outside) of the transparent base material 2 and the base material 3. FIG. Thereby, the structure can be simplified, the recording display medium and the electrode can be separated, and recording to the recording display medium can be performed from the outside.

  FIG. 13 shows the configuration of the recording display medium 30 of the display device according to the fourth embodiment. The recording display medium 30 is configured by arranging a plurality of microcapsules 4 between a transparent base material 2 and a base material 3 which are arranged to face each other with a space therebetween. In the recording display medium 30, the same components as those of the recording display medium 1 are denoted by the same reference numerals, and description thereof is omitted. At the time of image recording, a voltage is applied to each microcapsule 4 by the external electrodes 51a and 51b. Since the process of forming each color is the same as the method shown in the first embodiment (see FIGS. 4, 5, and 6), the description is omitted.

  FIG. 14 shows a schematic configuration of a recording device 40 for recording an image on the recording display medium 30. The recording device 40 includes a sensor 44 that detects the entry of the recording display medium 30, a conveyance roller 48 that conveys the recording display medium 30, and electrodes 51 a and 51 b that perform recording on the recording display medium 30. The electrodes 51a and 51b are formed in a line shape in a direction perpendicular to the conveyance direction of the recording display medium 30, and an image is formed when the recording display medium 30 passes between the electrodes 51a and 51b.

  FIG. 15 shows a functional configuration of the recording device 40. As shown in FIG. 15, the recording apparatus 40 includes a CPU (Central Processing Unit) 41, a recording display medium transport unit 42, a memory 43, a sensor 44, a voltage application unit 45, and a communication I / F (InterFace) 46.

  The CPU 41 controls the overall operation of the recording apparatus 40 by sending a control signal to each unit according to various control programs stored in a ROM (not shown) using a predetermined area of a RAM (not shown) as a work area.

  The recording display medium transport unit 42 includes a transport control unit 47 and a transport roller 48. The conveyance control unit 47 controls the conveyance roller 48 in accordance with a control signal from the CPU 41.

  The memory 43 stores recording data for recording on the recording display medium 30.

  The voltage application unit 45 includes an application time control unit 49, an electrode driving unit 50, and electrodes 51a and 51b. The application time control unit 49 controls the time for driving the electrodes 51 a and 51 b in accordance with a control signal from the CPU 41. The electrode driving unit 50 drives the electrodes 51a and 51b for a time corresponding to the recording data based on the control of the application time control unit 49, and applies a predetermined voltage between the electrodes 51a and 51b.

  The communication I / F 46 receives recording data from an external device. The received recording data is stored in the memory 43.

  When the entry of the recording display medium 30 is detected by the sensor 44, a control signal is output from the CPU 41 to the conveyance control unit 47 based on this detection signal, the conveyance roller 48 is driven, and the recording display medium 30 is conveyed. . When the recording display medium 30 reaches between the electrodes 51a and 51b, recording is started based on the recording data read from the memory 43. A control signal is output from the CPU 41 to the application time control unit 49. Based on the control of the application time control unit 49, a predetermined voltage is applied between the electrodes 51a and 51b by the electrode driving unit 50 for a time corresponding to the recording data. Is done.

  By setting the time for applying a predetermined voltage between the electrodes 51a and 51b at the position corresponding to each microcapsule 4 in the recording display medium 30 to the time corresponding to each color shown in FIG. Can be formed.

  As described above, according to the recording apparatus 40, since colors can be expressed continuously according to the time period during which an electric field is applied to the electrophoretic particles, high-resolution color display is possible and intermediate color expression is improved. Can do.

  Even when the intensity of an electric field applied to each electrophoretic particle is controlled to express a color, recording can be performed by an external electrode by adopting the same configuration as that of the recording display medium 30 shown in FIG. .

  FIG. 16 shows a functional configuration of a recording apparatus 60 for recording an image on such a recording display medium. As illustrated in FIG. 16, the recording apparatus 60 includes a CPU 41, a recording display medium transport unit 42, a memory 43, a sensor 44, a voltage application unit 45, and a communication I / F 46. In the recording apparatus 60, the same components as those of the recording apparatus 40 are denoted by the same reference numerals, and description thereof is omitted. Hereinafter, a characteristic configuration of the recording apparatus 60 will be described.

  The voltage application unit 45 includes an application voltage control unit 52, an electrode driving unit 50, and electrodes 51a and 51b. The applied voltage control unit 52 controls the magnitude of the voltage applied to the electrodes 51a and 51b in accordance with a control signal from the CPU 41. Based on the control of the applied voltage control unit 52, the electrode drive unit 50 applies a voltage having a magnitude corresponding to the recording data between the electrodes 51a and 51b for a certain period of time.

  When the sensor 44 detects the entry of the recording display medium, based on this detection signal, a control signal is output from the CPU 41 to the conveyance control unit 47, the conveyance roller 48 is driven, and the recording display medium is conveyed. When the recording display medium reaches between the electrodes 51a and 51b, recording is started based on the recording data read from the memory 43. A control signal is output from the CPU 41 to the applied voltage control unit 52. Based on the control of the applied voltage control unit 52, a voltage having a magnitude corresponding to the recording data is applied between the electrodes 51a and 51b by the electrode driving unit 50 for a certain period of time. Applied.

  By setting the magnitude of the voltage applied between the electrodes 51a and 51b at the position corresponding to each microcapsule 4 in the recording display medium to the voltage value corresponding to each color shown in FIG. Can be formed.

  As described above, according to the recording apparatus 60, since colors can be expressed continuously according to the magnitude of the electric field applied to the electrophoretic particles, high-resolution color display is possible, and the expression of intermediate colors is improved. be able to.

  The first, second, and third embodiments are suitable for a fixed installation type display device such as a display display device because the device has electrodes and a control mechanism. The fourth embodiment is suitable for a portable display device such as electronic paper because it has electrodes and a control mechanism outside the device. However, these utilization methods are examples and do not limit applications.

  Note that the description in each of the above embodiments is an example of a preferable display device according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of each part can be changed as appropriate without departing from the spirit of the present invention.

  For example, in each of the above embodiments, the case where each color is expressed by attracting the negatively charged electrophoretic particles to the positive electrode is described. However, the electrical characteristics of the electrode and the electrophoretic particles are positive and negative. The minus may be reversed.

  Moreover, although the case where the color of the electrophoretic particles is yellow, magenta, and cyan has been described, electrophoretic particles of red, green, and blue may be used. In addition, black electrophoretic particles may be added to use electrophoretic particles of a total of four colors. The dispersion medium may be black. At that time, white electrophoretic particles may be added to obtain a total of four colors.

It is a schematic diagram of the cross section of the recording display medium 1 of the display apparatus in 1st Embodiment. 3 is a schematic diagram showing a configuration of a microcapsule 4. FIG. (A) is a figure which shows distribution of the charge amount of each electrophoretic particle. (B) is a figure which shows distribution of the mobility of each electrophoretic particle. It is a figure which shows the state which initialized the recording display medium. 2 is a diagram illustrating a state in which yellow, red, magenta, and blue are formed on the recording display medium 1. FIG. 2 is a diagram showing a state in which cyan, green, and yellow are formed on a recording display medium 1. FIG. It is a figure which shows the position of each electrophoretic particle with respect to time to apply a predetermined voltage. It is a figure which shows the state which initialized the recording display medium 10 of the display apparatus in 2nd Embodiment. 2 is a diagram illustrating a state in which yellow, red, magenta, and blue are formed on the recording display medium 10. FIG. 2 is a diagram showing a state in which cyan, green, and yellow are formed on a recording display medium 10. FIG. It is a figure which shows the position of each electrophoretic particle with respect to the magnitude | size of the voltage applied between electrodes. It is a schematic diagram of the cross section of the recording display medium 20 of the display apparatus in 3rd Embodiment. It is a schematic diagram of the cross section of the recording display medium 30 of the display apparatus in 4th Embodiment. 1 is a schematic configuration diagram of a recording device 40 for recording an image on a recording display medium 30. FIG. 3 is a block diagram showing a functional configuration of a recording apparatus 40. FIG. 3 is a block diagram showing a functional configuration of a recording apparatus 60. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording display medium 2 Transparent base material 3 Base material 4 Microcapsule 5 Transparent electrode 6 Electrode 7 Dispersion medium 10 Recording display medium 20 Recording display medium 30 Recording display medium 40 Recording apparatus 41 CPU
42 Recording display medium transport unit 43 Memory 44 Sensor 45 Voltage application unit 46 Communication I / F
47 Conveying control unit 48 Conveying roller 49 Application time control unit 50 Electrode driving units 51a and 51b Electrode 52 Applied voltage control unit 60 Recording device Y Yellow particles M Magenta particles C Cyan particles y Yellow large charged particles

Claims (6)

A pair of base materials that are arranged opposite to each other at intervals and in which a pair of electrodes are formed , at least one of which is transparent, and
A dispersion medium enclosed between the pair of substrates;
A plurality of electrophoretic particles mixed in the dispersion medium and having different mobility and charge amount for each color;
Only including,
The electrophoretic particles have a relatively small charge amount as the mobility is relatively high,
By applying a voltage between the electrodes and cutting off the voltage application between the electrodes in a state where the particles having the highest mobility among the electrophoretic particles have reached the transparent substrate, the particles having the highest mobility can be obtained. A color display is obtained,
A voltage is applied between the electrodes, and after the particles having the highest mobility among the electrophoretic particles reach the transparent substrate, the particles having the second highest mobility move into the gap between the particles having the highest mobility. A recording display medium capable of displaying a mixed color display of the color of the particle having the highest mobility and the color of the second mobility particle by cutting off the voltage application between the electrodes in a state of entering. A display device characterized by that. The display device according to claim 1,
The display device, wherein the dispersion medium is enclosed in a plurality of microcapsules and is subdivided into cells. The display device according to claim 1 or 2,
A display device, wherein a pair of electrodes is formed on each of the opposing surfaces of the pair of base materials. The display device according to claim 1 or 2,
A display device, wherein a pair of electrodes is formed on each of the opposite surfaces of the pair of base materials. In the display device according to any one of claims 1 to 4,
A display device comprising control means for controlling a time for applying an electric field to the electrophoretic particles. In the display device according to any one of claims 1 to 4,
A display device comprising control means for controlling the strength of an electric field applied to the electrophoretic particles.

Images