JP2006113398A - Particle movement type display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a particle movement type display element with low cost and high reflectance.
SOLUTION: Colored charged particles 5 together with a medium 4 in a gap surrounded by a pair of substrates 1 and 2 arranged with a predetermined gap and a partition member 3 arranged in the gap between the pair of substrates 1 and 2 are provided. And transparent particles 6A and 6B having a refractive index different from that of the medium 4 are filled. Further, the transparent particles 6A and 6B are charged so as to be distributed along the reflective layer (electrode 7) according to the voltage applied to the plurality of electrodes 7 and 8, and at least one of the charge amount and the particle size is charged. Are filled with two or more types of transparent particles 6A and 6B.
[Selection] Figure 1

Description

  The present invention relates to a particle movement type display element that performs display by moving particles.

  2. Description of the Related Art In recent years, research has been actively conducted on particle moving display devices that perform black and white or color display based on moving particles by applying a voltage.

  Here, the particle movement type display element used in such a particle movement type display device includes a pair of substrates arranged with a predetermined gap, particles arranged in a gap between these substrates, and a proximity to the gap. And a pair of electrodes arranged in such a manner that a display and a polarizing plate having a display contrast higher than that of a liquid crystal display element, a wide viewing angle, and a memory property for display are provided. It has various features such as unnecessary.

  By the way, among such particle movement type display elements, a reflection type particle movement type display element that displays by reflecting incident external light is used when the illuminance of external light is weak, for example, when used indoors or at night. Then, since there is little incident external light, there exists a fault that a display becomes dark and visibility falls. For this reason, in such a reflective particle movement type display element, it is necessary to increase the reflectivity so as to efficiently reflect incident external light.

  Here, such a reflective particle movement type display element is roughly classified into two types, one that moves particles in the vertical direction with respect to the surface and one that moves particles in the horizontal direction. In the particle movement type display element moved in the direction, as a method for increasing the reflectance, there is a method for increasing the reflectance of particles used for bright display.

  On the other hand, in a particle movement type display device that moves particles in the horizontal direction, it is common to achieve bright display by collecting colored particles around the pixel and reflecting incident light by a reflective layer. In general, there are a method of increasing the reflectance by changing the material of the reflective layer, and a method of increasing the reflectance by a method of changing the material, thickness, or shape of the scattering layer (see Patent Document 1).

JP-A-11-202804

  However, in such a conventional particle movement type display element that moves particles in the horizontal direction, it is possible to efficiently reflect light by providing a reflective layer. When the scattering layer is provided, the cost increases, and there is a problem that a high driving voltage is required depending on the material and thickness of the scattering layer.

  Therefore, the present invention has been made in view of such a current situation, and an object thereof is to provide a particle movement type display element having a low cost and a high reflectance.

  The present invention includes a substrate, a plurality of partition members disposed on the substrate, a medium and a plurality of particles filled in a space between the substrate and the partition member, and a reflective layer disposed on the substrate. In the particle movement type display device comprising a plurality of pixels formed by a plurality of electrodes arranged so as to be close to the space, the particles are colored charged particles and transparent having a refractive index different from that of the medium It is characterized by being a particle.

  Further, the present invention fills a pair of substrates arranged with a predetermined gap, a plurality of partition members arranged in the gap between the pair of substrates, and a gap surrounded by the pair of substrates and the partition member. And a plurality of pixels, a reflective layer disposed on one of the pair of substrates, and a plurality of pixels formed by a plurality of electrodes disposed in proximity to the gap. In the particle movement type display device, the particles are colored charged particles and transparent particles having a refractive index different from that of the medium.

  As in the present invention, the space between the substrate and the partition member, or the gap surrounded by the pair of substrates and the partition member, is filled with colored charged particles and transparent particles having a refractive index different from that of the medium. Thus, light can be efficiently reflected. As a result, it is possible to provide a particle movement type display element with high reflectance and low cost and improved light utilization efficiency.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of an electrophoretic display element which is an example of a particle movement type display element according to a first embodiment of the present invention, and the electrophoretic display element is in a state where a predetermined gap is provided. A first substrate 1 and a second substrate 2 which are a pair of substrates, a partition 3 which is a partition member disposed in a gap between the substrates 1 and 2, and a gap between the substrates 1 and 2 and the partition 3. In the present embodiment, the insulating liquid 4, which is a medium, a plurality of colored charged particles 5 and at least two kinds, in the present embodiment, two kinds of transparent charged particles 6A and 6B, and the second substrate 2 are arranged. The first electrode 7 also functions as a reflective layer, and the second electrode 8 formed on the partition wall 3 is provided.

  The substrates 1 and 2, the partition 3, the insulating liquid 4, the plurality of colored charged particles 5, the two types of transparent charged particles 6 </ b> A and 6 </ b> B, Pixels a and b are formed by the first electrode 7 and the second electrode 8. The second electrode 8 is formed as a part of the partition 3. The two types of transparent charged particles 6 </ b> A and 6 </ b> B are charged with the opposite polarity to the colored charged particles 5 and have a refractive index different from that of the insulating liquid 4.

  By the way, in the display of the electrophoretic display device configured as described above, a voltage is applied between the first electrode 7 and the second electrode 8 to move the colored charged particles 5 and the transparent charged particles 6A and 6B between the two electrodes. By doing.

  For example, in FIG. 1, the state of the pixel a is a state in which colored charged particles 5 are accumulated on the second electrode side and transparent charged particles 6A and 6B are accumulated on the first electrode side. Here, since the transparent charged particles 6A and 6B have a refractive index different from that of the insulating liquid 4, the incident light 9 that has reached the transparent charged particles 6A and 6B passes through the transparent charged particles 6A and 6B, and a part thereof. It diffuses due to the difference in refractive index between the transparent charged particles 6 </ b> A and 6 </ b> B and the insulating liquid 4, leaks from the gap between the particles, and travels toward the first electrode 7.

  At this time, the light diffused in the traveling direction and the light transmitted through the transparent charged particles 6A and 6B are reflected by the first electrode 7 which also functions as a reflective layer, and the light reflected by the first electrode 7 is Then, it is again diffused by the transparent charged particles 6A and 6B and emitted to the outside world, and a bright display is obtained. In this way, not only the transmitted light but also the incident light leaking from the gap between the particles is reflected by the first electrode 7 and then diffused by the transparent charged particles 6A and 6B. It can be reflected efficiently.

  On the other hand, in FIG. 1, since the colored charged particles 5 move to the first electrode side and the transparent charged particles 6A and 6B move to the second electrode side, the incident light is absorbed by the colored charged particles 5 in FIG. The display is dark.

  The materials and manufacturing methods of the constituent members of the electrophoretic display element according to the present embodiment are as follows.

  For the first substrate 1 and the second substrate 2, glass, quartz, or the like can be used in addition to a plastic film such as polyethylene terephthalate (PET), polycarbonate (PC), or polyethersulfone (PES). When the electrophoretic display element is of a reflective type as in this embodiment, a material that transmits light is used for the substrate (first substrate 1) and the base material arranged on the viewer side. However, a colored substrate such as polyimide (PI) may be used for the other substrate (second substrate 2).

  As the insulating liquid 4, it is preferable to use a nonpolar solvent such as isoparaffin, silicone oil, xylene, and toluene that is transparent.

  As the colored charged particles 5, a material that is colored and exhibits good positive or negative charge characteristics in an insulating liquid, for example, various inorganic pigments, organic pigments, carbon black, or resins containing them. Can be used. The particle size of the colored charged particles 5 can be generally about 0.01 μm to 50 μm, preferably about 0.1 to 10 μm.

  The transparent charged particles 6A and 6B, which are charged transparent particles, have a refractive index different from that of the insulating liquid 4, and exhibit positive charge characteristics or positive charge characteristics in the insulating liquid, such as polycarbonate and polystyrene. Alternatively, a transparent resin such as silica can be used. The particle diameter of the transparent charged particles 6A and 6B can be generally about 0.01 μm to 50 μm, preferably about 0.1 to 10 μm. Further, the refractive index may be different from that of the insulating liquid 4, but it is preferable that the relative refractive index with respect to the insulating liquid 4 is about 0.95 or less, or about 1.05 or more.

  In addition, it is preferable to add a charge control agent for controlling and stabilizing the charging of the colored charged particles 5 and the transparent charged particles 6A and 6B in the insulating liquid 4 and the colored charged particles described above. As such a charge control agent, a metal complex salt of a monoazo dye, salicylic acid, an organic quaternary ammonium salt, a nigrosine compound, or the like may be used.

  Further, a dispersing agent for preventing aggregation of charged particles and maintaining a dispersed state may be added to the insulating liquid. As such a dispersant, a polyvalent metal phosphate such as calcium phosphate or magnesium phosphate, a carbonate such as calcium carbonate, other inorganic salts, inorganic oxides, or organic polymer materials can be used.

  The second electrode 8 is preferably formed of a conductive material that can be patterned, for example, a metal such as titanium (Ti), aluminum (Al), copper (Cu), carbon, silver paste, or an organic conductive film. Further, the first electrode 7 may be used not only as a specular reflection layer as shown in FIG. 1 but also as a diffuse reflection layer or a directivity reflection layer as described later. In that case, the first electrode 7 is preferably formed of a highly light-reflective material such as silver or Al.

  Note that an insulating layer may be formed on the surfaces of the first electrode 7 and the second electrode 8 to prevent insulation between the electrodes and injection of charges from the electrodes to the charged particles. In FIG. 1, the second electrode 8 is disposed between the partition wall 3 and the second substrate 2, but even if it is formed inside the partition wall 3, the second electrode 8 is disposed between the partition wall 3 and the first substrate 1. The number of electrodes included in each pixel is not particularly limited as long as the first electrode and the second electrode are a pair or more. Furthermore, the arrangement positions of the first electrode and the second electrode are not particularly limited, and the shapes of the first electrode and the second electrode are not particularly limited.

  The partition 3 may be made of the same material as the substrates 1 and 2 or may be made of a photosensitive resin such as acrylic. Any method may be used for forming the partition wall, for example, a method of performing exposure and wet development after applying a photosensitive resin layer, a method of bonding a separately created barrier, a method of forming by a printing method, or the like. Can be used. The partition wall 3 and the first substrate 1 may be formed by integral molding.

  1 is arranged so as to partition the pixels one by one. However, the present invention is not limited to this. For example, the partition 3 may be arranged so as to further partition one pixel into a plurality of pixels. Furthermore, the partition 3 may be arranged so as to partition a plurality of pixels, that is, a plurality of pixels may be included between adjacent partitions.

  In order to perform black and white display using the particle movement type display element according to this embodiment, the colored charged particles 5 may be black and the colored charged particles 5 may be driven by a shutter. In order to perform color display, for example, black colored particles 5 are used, and a color filter layer is formed on the first substrate 1 to enable color display.

  Incidentally, FIG. 2 is a diagram showing the relationship between the particle size of scattering particles and the scattering angle (Technical Report of IBICE EID95-146, ED95-220, SDM95-260 (1996-02)).

  In FIG. 2, α represents the particle size of the scattering particles. As can be seen from FIG. 2, when α is sufficiently small, the light is scattered at the same rate in the forward and backward directions, but the scattered light is concentrated in the forward direction as α increases. That is, it can be seen that the larger the scattering particle size, the lower the scattering property (diffusibility), and the smaller the scattering particle size, the higher the scattering property.

  On the other hand, in FIG. 1, the particle diameter of the transparent charged particle 6A is smaller than the particle diameter of the transparent charged particle 6B. Therefore, the transparent charged particles 6A having a small particle size have high scattering properties, and the transparent charged particles 6B having a larger particle size than the transparent charged particles 6A have low scattering properties.

  Further, the transparent charged particles 6A having a small particle size are likely to gather at the center of the pixel because of the high moving speed when applying an electric field due to the difference in mass compared to the transparent charged particles 6B having a large particle size, and the transparent charged particles 6B. Tends to gather near the partition 3.

  For example, by making the surface charge amount, which is the charge amount of the transparent charged particles 6A, larger than the surface charge amount of the transparent charged particles 6B, the transparent charged particles with respect to the voltage applied between the first and second electrodes during bright display. If the distance that 6A moves onto the first electrode 7 is made larger than that of the transparent charged particle 6B, the transparent charged particle 6A having a large refractive index is located near the center of the pixel, and the transparent charged particle 6B having a small refractive index is disposed around the pixel. It can also be arranged in the vicinity.

  Then, at the time of bright display, like the pixel a in FIG. 1, the highly charged transparent charged particles 6A are gathered on the central portion side of the pixel, and the less charged scattered charged particles 6B are collected on the partition wall side. Thus, the incident light 9 that has reached the transparent charged particles 6A having high scattering property among the incident light 9 becomes scattered light 10A diffused in a wide range, and a wide viewing angle can be maintained. Further, the incident light 9 that has reached the transparent charged particles 6B having a low scattering property becomes scattered light 10B diffused in a narrow range, hardly propagates to the colored charged particles 5 collected in the vicinity of the partition walls 3, and is scattered by the colored charged particles 5. The absorption of the light 10B can be extremely reduced. As a result, incident light can be efficiently reflected, and the reflectance with respect to incident light is improved.

  In this way, the gap between the pair of substrates 1 and 2 and the partition 3 is filled with the insulating liquid 4, the colored charged particles 5, and the transparent charged particles 6 </ b> A and 6 </ b> B having a different refractive index from the insulating liquid 4. Further, the transparent charged particles 6A and 6B are charged so as to be distributed along the first electrode 7 (reflection layer) according to the voltage applied to the first and second electrodes 7 and 8, and By filling two types of transparent charged particles 6A and 6B having different particle diameters, light can be efficiently reflected. As a result, it is possible to obtain a particle movement type display device having a high reflectance during bright display and a good contrast. Furthermore, it is possible to obtain a particle movement type display element with high reflectivity that is low in cost and has improved light utilization efficiency.

  By the way, in the particle movement type display element shown in FIG. 1, by arranging two kinds of transparent charged particles 6A and 6B having different particle diameters at desired positions, two kinds of areas of a high scattering area and a low area can be obtained. However, the present invention is not limited to this, and using three or more kinds of transparent charged particles having different particle diameters, the transparent charged particles are directed toward the colored charged particle accumulation portion during bright display. By arranging the particle size so as to continuously increase and continuously changing the scattering property, incident light can be efficiently reflected.

  Next, a second embodiment of the present invention will be described.

  FIG. 3 is a diagram showing a schematic configuration of an electrophoretic display element which is an example of a particle movement type display element according to the present embodiment. In FIG. 3, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  In FIG. 3, 11A and 11B are transparent charged particles. In the present embodiment, these transparent charged particles 11A and 11B have different relative refractive indexes with respect to the insulating liquid 4.

  FIG. 4 is a diagram showing the relationship between the relative refractive index of the scattering particles and the scattering angle (Technical Report of IBICE EID95-146, ED95-220, SDM95-260 (1996-02)). In FIG. 4, m represents the relative refractive index of the scattering particles. From FIG. 4, it can be seen that the scattering angle characteristic increases as m increases. That is, it can be seen that the higher the relative refractive index of the scattering particles, the higher the scattering property.

  On the other hand, in FIG. 3, the relative refractive index of the transparent charged particles 11A is larger than the relative refractive index of the transparent charged particles 11B. Therefore, the transparent charged particle 11A has a high scattering property, and the transparent charged particle 11B has a low scattering property.

  Therefore, at the time of bright display, as shown in FIG. 3, the transparent charged particles 11 </ b> A having high scattering properties are collected in the center of the pixel, and the transparent charged particles 11 </ b> B having low scattering properties are collected in the vicinity of the partition walls 3. The incident light can be efficiently reflected, and the reflectance with respect to the incident light is improved.

  In order to move the transparent charged particles 11A and 11B to such a position, for example, the surface charge amount of the transparent charged particle 11A is made larger than the surface charge amount of the transparent charged particle 11B, and the voltage applied during bright display is set. By making the distance that the transparent charged particle 11A moves onto the first electrode 7 larger than that of the transparent charged particle 11B, the transparent charged particle 11A having a large refractive index is placed on the pixel central portion side, and the transparent charge having a small refractive index is set. The particles 11B can be arranged on the partition wall side.

  Similarly to the first embodiment described above, when the particle diameters of the transparent charged particles 11A and 11B are different, the movement of the transparent charged particles 11A and 11B can be made faster.

  As described above, the gap between the pair of substrates 1 and 2 and the partition 3 is filled with the insulating liquid 4, the colored charged particles 5, and the transparent charged particles 11 </ b> A and 11 </ b> B having a different refractive index from the insulating liquid 4. Further, the transparent charged particles 11A and 11B are charged so as to be distributed along the first electrode 7 (reflection layer) according to the voltage applied to the first and second electrodes 7 and 8, and By filling the two types of transparent charged particles 11A and 11B having different charge amounts, light can be efficiently reflected. As a result, a display element having a high reflectance at the time of bright display and a good contrast can be obtained. Furthermore, it is possible to obtain a particle movement type display element with high reflectivity that is low in cost and has improved light utilization efficiency.

  By the way, in the particle movement type display element shown in FIG. 3, two types of transparent charged particles 11A and 11B having different surface charge amounts and refractive indexes are arranged at desired positions, so that two regions of high scattering and low regions can be obtained. However, the present invention is not limited to this, and using three or more types of transparent charged particles having different surface charge amounts and refractive indexes, toward the colored charged particle accumulation portion at the time of bright display. By arranging the transparent charged particles so that the refractive index thereof continuously decreases and continuously changing the scattering property, incident light can be efficiently reflected.

  Further, in the present embodiment and the first embodiment described above, the characteristics of reflected light can be changed by controlling the voltage to be applied. For example, by changing the particle size distribution and refractive index distribution state of the transparent charged particles 6 and 11 in the pixel surface during bright display by changing the magnitude of the applied voltage and the application time, reflection during bright display is achieved. The directivity of light can be controlled.

  Next, a third embodiment of the present invention will be described.

  FIG. 5 is a diagram showing a schematic configuration of an electrophoretic display element which is an example of a particle movement type display element according to the present embodiment. In FIG. 5, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  In FIG. 5, 7A is a first electrode, and the first electrode 7A is provided at a position corresponding to the central portion of the pixel. Reference numeral 12 denotes a reflective layer, and the reflective layer 12 is provided at a location corresponding to the pixel of the second substrate 2 separately from the first electrode 7A. In addition, by arrange | positioning the reflection layer 12 in such a position, incident light can be reflected efficiently.

  Here, by providing the first electrode 7A at a position corresponding to the central portion of the pixel in this way, the electric field strength increases toward the center of the pixel at the time of bright display. As a result, at the time of bright display, FIG. As shown, the transparent charged particles 6 can be accumulated on the first electrode. And, by changing the thickness of the particle layer composed of the plurality of transparent charged particles 6 accumulated on the first electrode in this manner so as to become continuously thinner toward the colored charged particle accumulation portion, that is, the partition wall side, It is possible to prevent scattered light from proceeding to the colored charged particle accumulation portion.

  In the present embodiment, the first charged electrode 7A is arranged at a position corresponding to the pixel central portion so that the transparent charged particles 6 are accumulated around the pixel central portion. The thickness of the formed particle layer is not limited to this as long as it can be continuously changed toward the colored charged particle accumulation portion.

  By the way, as described above, the first electrode 7 having the function of the reflection layer shown in FIG. 1 or 3 is a mirror reflection layer, a diffuse reflection layer, a directional reflection layer, or a combination thereof. Also good.

  For example, as shown in FIG. 6 which is a diagram showing a schematic configuration of an electrophoretic display element which is an example of a particle movement type display element according to a fourth embodiment of the present invention, regular irregularities are used as the first electrode 7. By using the one that also functions as a directional reflective layer having a shape, and at the time of bright display, the transparent charged particles 6 are arranged on the first electrode 7 that also functions as the directional reflective layer. Further, the scattering property can be improved. In this case, the reflectance can be further improved by designing the directional reflective layer so that the reflected light does not proceed to the colored charged particle accumulation portion formed during bright display.

  Hereinafter, the present invention will be described in more detail with reference to examples.

  This example is an example according to the first embodiment shown in FIG. 1. In this example, the size of one pixel a and b is 100 μm × 100 μm. A glass substrate having a thickness of 1.1 mm is used as the second substrate 2, and a partition wall 3 is disposed at the boundary between the pixels a and b. The width of the partition 3 is 5 μm and the height is 18 μm. The first electrode 7 also serving as a specular reflection layer has a width of 90 μm and a thickness of 0.1 μm. Further, the second electrode 8 is disposed at a pixel boundary portion (between the partition wall 3 and the second substrate 2), and has a width of 5 μm and a thickness of 0.1 μm. A thin film transistor (TFT) (not shown) is formed in each pixel a and b, and a voltage application circuit (not shown) is connected to the pixel a and b to form a particle movement type display element.

  Each pixel is filled with an insulating liquid 4, colored charged particles 5, and transparent charged particles 6A and 6B. The insulating liquid 4 is made of isoparaffin (trade name: Isopar, manufactured by Exxon), and the colored charged particles 5 are made of polystyrene-polymethyl methacrylate copolymer resin containing carbon black having a particle diameter of about 1 to 2 μm. To do.

  As the transparent charged particles 6A and 6B, silica particles having a particle diameter of 1 to 2 μm and 4 to 5 μm and a relative refractive index of 1.1 with respect to isoparaffin are used. The zeta potentials on the surfaces of the transparent charged particles 6A and 6B are 50 mV and 15 mV, respectively. Isoparaffin contains succinimide (trade name: OLOA 1200, manufactured by Chevron) for charge control. Al is used for the first electrode 7 in order to obtain a high reflectance.

  A curable resin layer (sealing layer) is disposed on the first substrate 1 so as to be in contact with the insulating liquid 4. The material of the curable resin layer is a mixture mainly composed of polyethylene glycol methacrylate.

  By adopting the above configuration, it is possible to obtain a particle movement type display device having a high reflectance during bright display and a good contrast.

  This example is an example according to the third embodiment shown in FIG. 5. In this example, the first electrode 7A also serving as a specular reflection layer is arranged at the center of each pixel, and has a width of 20 μm and a thickness. The thickness is 0.1 μm. The specular reflection layer 12 different from the first electrode 7 has a width of 90 μm and a thickness of 0.1 μm.

  Each pixel is filled with an insulating liquid 4, colored charged particles 5 and transparent charged particles 6. Isoparaffin (trade name: Isopar, manufactured by Exxon) is used for the insulating liquid 4, and polystyrene-polymethyl methacrylate copolymer resin containing carbon black having a particle diameter of about 1 to 2 μm is used for the colored charged particles 5. As the transparent charged particles 6, silica particles having a relative refractive index of 1.1 with respect to isoparaffin having a particle diameter of 1 to 2 μm are used. The zeta potential on the surface of the transparent charged particles 6 is 50 mV. Except these, it produces on the conditions similar to Example 1. FIG.

  By adopting the above configuration, it is possible to obtain a particle movement type display device having a high reflectance during bright display and a good contrast.

  In the above description, the insulating liquid 4, the colored charged particles 5, and the transparent charged particles 6 having a refractive index different from that of the insulating liquid 4 are formed in a gap surrounded by the pair of substrates 1 and 2 and the partition wall member 3. However, the present invention is not limited to this. For example, an insulating liquid, colored charged particles, and transparent particles are microencapsulated, and the microcapsules are arranged in each pixel. This can also be applied to the above.

  And microencapsulated in this way, together with the insulating liquid, charged charged particles and transparent particles having a refractive index different from that of the insulating liquid are filled in the space between the substrate and the partition wall, Efficient light efficiency by charging two or more kinds of transparent particles that are charged so as to be distributed along the reflective layer according to the voltage applied to the plurality of electrodes, and at least one of the charge amount and the particle size is different. Can be reflected. As a result, it is possible to provide a particle movement type display element with high reflectance and low cost and improved light utilization efficiency.

1 is a diagram showing a schematic configuration of an electrophoretic display element which is an example of a particle movement type display element according to a first embodiment of the present invention. The figure which shows the relationship between the particle size of a scattering particle, and a scattering angle. The figure which shows schematic structure of the electrophoretic display element which is an example of the particle movement type display element which concerns on the 2nd Embodiment of this invention. The figure which shows the relationship between the relative refractive index of a scattering particle, and a scattering angle. The figure which shows schematic structure of the electrophoretic display element which is an example of the particle movement type display element which concerns on the 3rd Embodiment of this invention. The figure which shows schematic structure of the electrophoretic display element which is an example of the particle movement type display element which concerns on the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 2nd board | substrate 3 Partition 4 Insulating liquid 5 Colored charged particle 6A Transparent charged particle (particle with a small particle diameter)
6B Transparent charged particles (particles with large particle size)
7, 7A First electrode 8 Second electrode 9 Incident light 10A Scattered light 10B from transparent charged particle 6A Scattered light 11A from transparent charged particle 6B Transparent charged particle (particle having a large relative refractive index)
11B Transparent charged particles (particles with a small relative refractive index)
12 Reflective layer

Claims (9)

A substrate, a plurality of partition members disposed on the substrate, a medium and a plurality of particles filled in a space between the substrate and the partition member, a reflective layer disposed on the substrate, and the space In a particle movement type display device comprising a plurality of pixels formed by a plurality of electrodes arranged so as to be close to each other,
The particle moving display element, wherein the particles are colored charged particles and transparent particles having a refractive index different from that of the medium. A pair of substrates disposed with a predetermined gap, a plurality of partition members disposed in the gap between the pair of substrates, a medium filled in a gap surrounded by the pair of substrates and the partition member, and a plurality of partitions A particle movement type display device comprising a particle, a reflective layer disposed on one of the pair of substrates, and a plurality of pixels formed by a plurality of electrodes disposed to be close to the gap In
The particle moving display element, wherein the particles are colored charged particles and transparent particles having a refractive index different from that of the medium.   The transparent particles are charged with the opposite polarity to the colored charged particles, and at least one of the charge amount and the particle size is different so as to form a distribution along the reflective layer according to the voltage applied to the plurality of electrodes. The particle movement type display element according to claim 1, wherein the particle movement type display element is two or more kinds of transparent particles.   The transparent particles have a distribution such that scattering is reduced from a center side of the pixel toward a partition member side in accordance with a voltage applied to the plurality of electrodes during bright display. Item 4. A particle movement type display device according to Item 3.   The distribution in which the scattering property is reduced toward the partition member is a distribution in which transparent particles having a small particle size are positioned on the center side of the pixel and transparent particles having a large particle size are positioned on the partition member side. The particle movement type display element of Claim 4.   The distribution such that the scattering property decreases along the partition member is a distribution in which transparent particles having a large refractive index are located on the center side of the pixel and transparent particles having a small refractive index are located on the partition member side. The particle movement type display element of Claim 4.   4. The particle movement type display element according to claim 1, wherein the reflective layer is constituted by one of the plurality of electrodes. 5.   The transparent particles are charged with a polarity opposite to that of the colored charged particles, and the plurality of transparent particles formed in accordance with voltages applied to the plurality of electrodes are thinned toward the partition wall member. 3. The particle movement type display element according to claim 1, wherein an electrode arranged along the reflective layer is provided at a position corresponding to a central portion of the pixel. 3. The particle movement type display element according to claim 1, wherein the reflection layer is one of a specular reflection layer, a diffuse reflection layer, and a directional reflection layer, or a combination thereof.

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