Abstract:
A transflective electrophoretic display device is disclosed. The device is comprised of a transparent top substrate and both top and bottom substrates have an electrode structure. A plurality of separated walls and an electrophoretic display solution including a plurality of chromatic particles and a transparent liquid are imposed between the two substrates. A device with a display liquid or a filter plate is used to generate a variety of lights such as monochromatic, color-level or true color having a mixture of red, green and blue. The device of the present invention integrates the merits of the reflective and transmitted displayer, and can be used outdoors, indoors or in darkness. Otherwise, a back light module can compensate for the contrast of the displayer effectively.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   A transflective electrophoretic display device is disclosed, and more particularly, a device employing a plurality of color particles affected by an electric field is introduced to display monochrome or color images. 
   2. Description of Related Art 
   A electrophoretic display device, which comprises a plurality of charged particles controlled by a provided electric field, displays by changing reflectivity in a display region therein relative to a surrounding light. The display device has the following features: (1) it&#39;s flexible; (2) it incorporates the surrounding light to improve visibility; (3) it can be manufactured by roll-to-roll process, so it has a high yield and reduces the yielding cost; (4) since there is no limit to the viewing angle, the device can be seen from any point of view; (5) it&#39;s not sensitive to the distance variation between two panels; (6) the electrophoretic display device has bistability, which is one of the most important characteristic of a flexible display device. 
   The surface of particles can be charged by being ionized or absorbing other charged particles. When charged particles of an electrophoretic display device are activated by an external electric field, they will move to the opposite direction relative to the electrode with opposite charges. A plurality of factors such as particle type, particle diameter, particle concentration, and the intensity, distribution and direction of the external electric field, and the type of the display solvent of the particles mentioned above will cause different moving speeds of the particles and achieve different displaying purposes. 
   U.S. Pat. No. 6,750,844 discloses a pliable electrophoretic display device having a deformation-resistant memory characteristic provided by covering a plurality of partitioning walls defining display sections containing a dispersion liquid with electrophoretic particles dispersed therein with an expandable ceiling sheet. U.S. Pat. No. 6,751,007 and No. 6,750,844 further disclose that the partitioning walls with high strength are disposed between the display cells. Wherein, the shape, size and the aspect ratio of the partitioning walls cause the embodiment of the display device. The plurality of pigment particles are dispersed in the solvent, and microcup technology is introduced in these prior arts. The mentioned display device with microcup structure can ignore the boundary sealing of each display cell, and accomplishes a flexible feature. 
   U.S. Pat. No. 6,751,007 provides a transflective electrophoretic display of SiPix Imaging, Inc. Reference is made to  FIG. 1A , which shows one of a plurality of display cells  103  divided by the partitioning walls  109 , and forms a display device. The cell  103  includes a top substrate  101 , a bottom substrate  102  with electrodes, surrounding partitioning walls, and a plurality of pigment particles  104  in the display solvent  105  filled in a space isolated by the plurality of partitioning walls  109 , and the display cell  103  is sealed by a sealing layer  106 , and finally a backlight module  107  is disposed to compensate for the displaying of the electrophoretic display device. 
   An electric field is generated by the electrodes in the top or bottom substrate as shown in  FIG. 1A , and an electric field is used to affect the behavior of the pigment particles  104  in the display solvent  105 . The types of the electric field include an up/down switching mode, an in-plane switching mode and a dual switching mode. As shown in  FIG. 1A , the top substrate  101  can be a conducting glass such as Indium Tin Oxide (ITO), and the bottom substrate  102  includes in-plane electrodes  110   a  and  110   b  divided by the partitioning slabs  112  and the bottom electrode  111 . 
   Furthermore, U.S. Pat. No. 6,639,580 (Electrophoretic Display Device and Method for Addressing Display Device) discloses the technology of an in-plane electric field. Wherein the in-plane electrode generates an in-plane electric field to change the status of the charged particles in the display solvent and generate various display effects. 
     FIG. 1B  shows a display device of the prior art formed by a plurality of display cells  103  including a plurality of microcups arranged in a rectangular array. The display cell  103  of one of the embodiments includes primary colors such as red, green and blue for displaying color, namely, a three-monochromatic display cell forms a chromatic display cell. 
   The chromatic display cell  20  shown in  FIG. 2A  includes three separated primary color sub-display cells. A plurality of white charged pigment particles  24  in the colorless display solvent  25  scatters the light emitted from the backlight module. Another embodiment shows the filtering plates  21 ,  22  and  23  with red, green and blue disposed in these sub-display cells. 
   An electric field with a different status generated by the electrodes disposed in the bottom substrate is used to guide the behavior of the charged pigment particles  24 , and further results in the scattering effect mentioned above. The primary color filtering plates  21 ,  22  and  23  are used to display a variety of color effects. In yet another embodiment, a further displaying result occurs if the white pigment particles  24  are changed to light-absorbed black pigment particles. 
     FIG. 2B  shows a chromatic display device of the prior art. The display cell  20  includes three sub-display cells with red, green and blue colors. The colorless and transparent display solvent  25  includes color pigment particles  26 ,  27  and  28 , which are red pigment particles  26 , green pigment particles  27  and blue pigment particles  28  respectively. The electric field is changed by the electrode in the bottom substrate with black or white plates. Those color pigment particles  26 ,  27  and  28  in the display solvent  25  are then activated to display various effects. 
   The reflective-type electrophoretic displayer of the prior art doesn&#39;t function when the surrounding light is weak or nonexistent. Moreover, the transmissive-type electrophoretic displayer is not adaptable to portable devices since it consumes a lot of power. 
   Some drawbacks are associated with the technology having partitioning walls in the prior art provided by the SiPix Imaging, Inc. Since the partitioning walls  109  are used as the medium for the backlight, this allows the electrophoretic displayer to operate in the dark, but the partitioning walls may possibly cause light leakage. Moreover, the backlight doesn&#39;t go through the display solvent directly, so it doesn&#39;t provide a quality of high display. Meanwhile, the electrophoretic displayer includes both the reflective-type and the transmissive-type, so it has complicated design and is difficult to fabricate. 
   In view of the aforementioned drawbacks of the prior art, the present invention provides a transflective electrophoretic display device, which facilitates illumination effects since both the surrounding light and the backlight can go through the display solvent completely. Meanwhile, the backlight module can be adjusted based on the condition of surrounding light, and effectively enhances the contrast of the display and reduces power consumption. Furthermore, the present invention has a simplified design and higher manufacturing yield. 
   SUMMARY OF THE INVENTION 
   A transflective electrophoretic display device is provided for illuminating with or without surrounding light. A light emitted from a backlight module can be adjusted according to the condition of the surrounding light so as to reduce power consumption and enhance the quality of the display. 
   The transflective electrophoretic display device is composed of a plurality of display cells, the display device comprises a top substrate, which is a transparent substrate having a plurality of anisotropic reflective plates; a bottom substrate having a plurality of light plates and a plurality of electrodes so as to generate an electric field, and the bottom substrate is installed opposite to the top substrate; a plurality of partitioning walls, which are transparent materials are disposed between the top substrate and the bottom substrate so as to isolate the plurality of display cells; a display solution, which is composed of a plurality of pigment particles and transparent liquid to fill a space isolated by the top substrate, the bottom substrate and the partitioning walls. Wherein, the electric field in the display cell is changed to guide the behavior of the plurality of charged pigment particles in the display solution, a light emits to the anisotropic reflective plates of the top substrate through the partitioning walls, and the plates reflect the light to the display solution so as to radiate monochromatic or gray-scale effects. 
   The transflective electrophoretic display device is composed of a plurality of display cells, and each display cell is further composed of a plurality of sub-display cells having red, green and blue colors. The display device comprises a top substrate, which is a transparent substrate having a plurality of anisotropic reflective plates; a bottom substrate having a plurality of light plates and a plurality of electrodes so as to generate an electric field, and the bottom substrate is installed opposite to the top substrate; a plurality of partitioning walls, which are transparent materials and disposed between the top substrate and the bottom substrate so as to isolate the plurality of sub-display cells; a red display solution, a green display solution and a blue display solution which are composed of a plurality of pigment particles and transparent liquids so as to fill a space isolated by the top substrate, the bottom substrate and the partitioning walls. Wherein, the electric field in the display cell is changed to guide the behavior of the plurality of charged pigment particles in the red, green, and blue display solution, a light emits to the anisotropic reflective plates of the top substrate through the partitioning walls, and the reflective plates reflect the light to the red, green and blue display solution so as to radiate color effects. 
   Furthermore, the transflective electrophoretic display device of another embodiment is composed of a plurality of display cells, and the display cell is further composed of a plurality of sub-display cells having a red filter, a green filter and a blue filter with a transparent material installed on the top substrate or the bottom substrate. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will be readily understood by the following detailed description in conjunction with the accompanying drawings, in which: 
       FIG. 1A  is a schematic diagram of a display cell of a transflective electrophoretic display of the prior art; 
       FIG. 1B  is a schematic diagram of a transflective electrophoretic display of the prior art; 
       FIG. 2A  is a schematic diagram of the color display device of the prior art; 
       FIG. 2B  is a schematic diagram of the color display device of the prior art; 
       FIG. 3  is a schematic diagram of a transflective electrophoretic display device of the present invention; 
       FIG. 4A  is a lateral view of the first embodiment of the present invention in a WHITE-state; 
       FIG. 4B  is an overlooking viewing view of the first embodiment of the present invention in a WHITE-state; 
       FIG. 5A  is a lateral view of the first embodiment of the present invention in a BLACK-state; 
       FIG. 5B  is an overlooking view of the first embodiment of the present invention in a BLACK-state; 
       FIG. 6A  is a lateral view of the second embodiment of the present invention in a WHITE-state; 
       FIG. 6B  is a lateral view of the second embodiment of the present invention in a BLACK-state; 
       FIG. 7A  is a lateral view of the third embodiment of the present invention in a WHITE-state; 
       FIG. 7B  is a lateral view of the third embodiment of the present invention in a BLACK-state; 
       FIG. 7C  is a lateral view of the third embodiment of the present invention in a RED-state; 
       FIG. 8A  is a lateral view of the fourth embodiment of the present invention in a WHITE-state; 
       FIG. 8B  is a lateral view of the fourth embodiment of the present invention in a GREEN-state; 
       FIG. 9A  is a lateral view of the fifth embodiment of the present invention in a WHITE-state; 
       FIG. 9B  is a lateral view of the fifth embodiment of the present invention in a BLACK-state; 
       FIG. 10A  is a lateral view of the sixth embodiment of the present invention in a WHITE-state; 
       FIG. 10B  is a lateral view of the sixth embodiment of the present invention in a GREEN-state; 
       FIG. 11A  is a lateral view of the seventh embodiment of the present invention in a WHITE-state; 
       FIG. 11B  is a lateral view of the seventh embodiment of the present invention in a RED-state; 
       FIG. 12A  is a lateral view of the eighth embodiment of the transflective electrophoretic display device of the present invention; 
       FIG. 12B  is an overlooking view of the eighth embodiment of the transflective electrophoretic display device of the present invention; and 
       FIG. 12C  is an overlooking view of the eighth embodiment of the transflective electrophoretic display device of the present invention. 
   

   DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
   To allow the examiner to understand the technology, means and functions adopted in the present invention further, reference is made to the following detailed description and attached drawings. The examiner shall readily understand the invention deeply and concretely from the purpose, characteristics and specification of the present invention. Nevertheless, the present invention is not limited to the attached drawings and embodiments in following description. 
   A transflective electrophoretic display device of the present invention is introduced to integrate the advantages of the conventional reflective and transmissive electrophoretic displayer. The display device includes a transparent top substrate, and a top/bottom substrate having in-plane electrodes. A plurality of partitioning walls and a display solution having a plurality of pigment particles and a transparent liquid are disposed between the two substrates so as to generate monochromatic, or color-scale, or color effects. The display device of the present invention facilitates brightness since both the surrounding light and the backlight can go through the mentioned display solution completely. Moreover, the brightness of the backlight can be adjusted based on the condition of the surrounding light, and effectively enhance the contrast of the display and reduce the power consumption. 
     FIG. 3  is a schematic diagram of a transflective electrophoretic display device composed of a plurality of display cells  300 , which form a rectangular array, and other embodiments such as a hexagon, a circular form, a rhombus or the like, but not limited to these. The display device of the present invention can be implemented as a flexible device because of the microcup structure therein. The display cell  300  is isolated by the top substrate, the bottom substrate and the plurality of partitioning walls; a space therebetween can be filled with a transparent liquid having a plurality of pigment particles  301 . Wherein, the pigment particles  301  can be white, black, chromatic, or other transparent chromatic particles. An electric field generated in virtue of the electrodes in the substrates can be changed to change the dispersed behavior of the charged particles so as to change the displaying effect. 
     FIG. 4A  and  FIG. 4B  show the first embodiment of the present invention in a white state. The display cell  300  includes a top substrate  401  with a transparent material, a bottom substrate  402  having an electrode structure installed on the other side of the top substrate  401 , and a space isolated by the partitioning walls  405 . A plurality of anisotropic reflective plates  403  are installed along the top substrate  401  relative to the positions of the partitioning walls  405 . The electrodes with in-plane switching mode are disposed in the bottom substrate  402  or even the top substrate  401  so as to generate an in-plane electric field. A black absorbing plate  404  of the preferred embodiment is installed along the bottom substrate  402  excluding the area where the partitioning walls  405  contact the bottom substrate. The aforementioned partitioning walls  405  are transparent, and a light source (not shown in this diagram) is set below the display cell  300 . A backlight from the light source is emitted to the anisotropic reflective plates  403  of the top substrate  401  from a gap  407  of the absorbing plate and through the partitioning walls  405 . The incidental light is reflected to the space of the cell, but not the original direction from the light source due to the anisotropic reflective plates  403 . Additionally, the surrounding light also enters the display solution  408  and fills the space identical to the backlight so as to enhance the displaying effect efficiently. 
   The mentioned electrophoretic display solution  408  includes the charged white particles  406  and the transparent liquid of the preferred embodiment. The features of the display solution, such as its color and transparency, are used to generate various displaying modes, or even collocate the features, such as color, transparency and reflectivity, of the bottom substrate. 
   Nevertheless, the area of the anisotropic reflective plates of the top substrate is larger or equal to the area occupied by the partitioning walls. In this embodiment, the area of the anisotropic reflective plates occupy 1% to 99% of the total area of the display device, but 7% to 60% is preferred to produce better displaying effects. The open area of the space of the display cell is 10 2  to 10 6  μm 2 , but the preferred area is 10 3  to 10 5  μm 2 . The distance between the top substrate and the bottom substrate is 5 to 200 μm, but the preferred distance is 10 to 100 μm. 
   The first embodiment in white-state is shown in  FIG. 4A . The dash line shows the light path of the backlight emitted through the gap  407  from a backlight module below the bottom substrate  402  to the anisotropic reflective plates  403  of the top substrate  401  via the partitioning walls  405 . The backlight is reflected by the anisotropic reflective plates  403  to the display solution  408  of the cell, and the display cell displays a white state since the charged white particles  406  reflects or scatters the light out. The light source can also be surrounding light emitting to the display cell  300  through the top substrate  401 , and reflected or scattered by the white particles  406  so as to display a white state. In another embodiment, the color of pigment particles can be changed to another color or become transparent so as to radiate the various colors of the display device. 
     FIG. 4B  shows an overlooking view of the display device in a white state. Each display cell  300  thereof is isolated by the partitioning walls  405  between the top and bottom substrates. The white particles  406  with reflective features are dispersed on the bottom substrate  402 , the white particles  406  reflect the incidental light out to form white light. 
     FIG. 5A  is a lateral view of the first embodiment of the present invention in the black state. The backlight emits through the gap  407  of the absorbing plate  404  to the top substrate  401  via the transparent partitioning walls  405 . The anisotropic reflective plates  403  reflect the light to the display solution  408  of the display cell  300 . The white particles  406  are dispersed leaning against the partitioning walls  405  due to the effect of the electric field. Since the bottom of the display cell  300  is the black absorbing plate  404 , the reflected light is absorbed by the plate  404  so as to radiate in a black state. Similarly, the surrounding light enters the display solution  408  directly and becomes absorbed by the black absorbing plate  404  so as to radiate in a black state. If the anisotropic reflective plates  403  are chromatic plates in this embodiment, the display device  300  can display various effects. 
   Reference is made to  FIG. 5B , which shows an overlooking view of the first embodiment in a black state. The white particles  406  are dispersed leaning against the partitioning walls  405  due to the action of the electric field. The absorbing plate  404  of the bottom substrate  402  absorbs the incidental light so as to radiate in a black state. 
   The structure of the display cell of the second embodiment shown in  FIG. 6A  is similar to the structure in  FIG. 4A . Wherein a space of the display cell is isolated by the partitioning walls  405  between the top substrate  401  and the bottom substrate  402 . The space is filled with a display solution  608  having a plurality of black particles  606  and a transparent liquid. The plurality of anisotropic reflective plates  403  is disposed along the top substrate  401  excluding the area where the partitioning walls  405  contact the top substrate  401 . The electrodes can be installed on the top or bottom substrate, and thereby the electric field is generated accordingly. The absorbing or reflective plates, such as the reflective plate  604  shown in the diagram, are disposed along the bottom substrate  402  excluding the area where the partitioning walls  405  contact the bottom substrate  402 . A light source set below the display cell emits through the gap  407  of the reflective plate  604  and goes through the partitioning walls  405 . The anisotropic reflective plates  403  of the top substrate  401  reflect the light to the display solution  608  so as to radiate in a white state since the reflective plate  604  reflects the incidental light. 
   The charged black particles  606  are dispersed leaning against the partitioning walls  405  according to the action of the electrodes in the top substrate  401  or the bottom substrate  402 . The incidental light is reflected or scattered by the reflective plate  604  of the bottom substrate  402  so as to radiate in a white state. The color of the reflective plate  604  of another embodiment can be changed to display various effects. 
     FIG. 6B  shows the second embodiment of the present invention in a black state. The black particles  606  thereof are dispersed to the top substrate  401  according to the action of the electric field generated by the electrodes in the top or the bottom substrate. After that, the black particles  606  block the light reflected or scattered by the reflective plate  604  of the bottom substrate  402 . They also block the incidental surrounding light so as to radiate in a black state. Wherein, the display cell  300  shows different colors since the black particles  606  can be changed to other color particles. 
   The structure of the mentioned display cell includes the top substrate  401  having electrodes therein and the anisotropic reflective plates  403  are disposed along the area where the partitioning walls  405  contact the top substrate  401 . The display cell further includes the bottom substrate  402  having lateral electrodes and the reflective plate  403  therein. The display cell composed of the top substrate  401  and the bottom substrate  402  is a micro-structure, and the display solution  408  that fills the isolated space inside contains the plurality of black particles  606  and the transparent liquid. 
   The electric field generated by the electrodes in the bottom substrate  402  can be an in-plane switching mode. The electric field generated by the electrodes disposed in both the top substrate  401  and the bottom substrate  402  can be an up/down switching mode, an in-plane switching mode, or a dual switching mode. A backlight module is further disposed below the bottom substrate  402 . 
   The present invention also provides a display cell for displaying color effects. The display cell therein at least includes three sub-display cells with the three primary colors, and each cell is composed of a transparent top substrate, the top/bottom substrate having in-plane electrodes, the plurality of partitioning walls therebetween and the display solution having the plurality of charged pigment particles and the transparent liquid with three different colors or three color filters. Both the surrounding light and the backlight can go through the display solution completely so as to enhance the displaying effect. The backlight can be adjusted so that it appears to be brighter or darker based on the condition of the surrounding light. Thereby, the present invention can efficiently reduce power consumption and enhance the contrast and tint. 
     FIGS. 7A ,  7 B and  7 C are the lateral view of the third embodiment of the present invention. The color display cell  70  includes the top substrate  701  with a transparent material, the bottom substrate  702  with electrodes disposed along the bottom substrate  702  opposite to the top substrate  701 , a micro-structure space isolated by the partitioning walls  76 . The color display cell  70  displays color effects using the sub-display cells having the three primary colors, red, green and blue. Otherwise, the electrodes disposed in the top substrate  701  and the bottom substrate  702  can generate an up/down switching mode, an in-plane switching mode or the a dual switching mode. 
   An absorbing or reflecting plate, such as the black absorbing plate of this embodiment, is installed along the bottom substrate  702  excluding the area where the partitioning walls  76  contact the bottom substrate  702 . The partitioning walls  76  thereof are transparent, and the light source is disposed below the color display cell  70 . The light shown as the dash line in the diagram emits from the light source through the gap of the absorbing plate  712 , and enters the partitioning walls  76 , then hits the anisotropic reflective plate  711  of the top substrate  701 . The light is finally reflected by the anisotropic reflective plate  711  and enters the space of the color display cell  70 . The aforementioned light can completely pass through the display solutions  71 ,  73  and  75 , and the surrounding light can also enter the display cell  70  so as to radiate light efficiently. 
   Further, the color display cell  70  includes a transparent liquid such as a red display solution  71 , a green display solution  73  and a blue display solution  75 . Therein, the liquid contains charged pigment particles  72  including the white particles that can reflect or scatter light broadly. The light reflected by the anisotropic reflective plate  711  can radiate different color effects through the color display solution. 
     FIG. 7A  shows the third embodiment in the white state of the present invention. Wherein, the dash line presents the path of light, which emits from the backlight module below the bottom substrate  702  through the gap of the absorbing plate  712  thereof. After that, the light enters the partitioning walls  76 , and is reflected by the anisotropic reflective plates  711  disposed on the top substrate  701 . Then the reflected light goes into the spaces filled with the red, green and blue display solutions  71 ,  73  and  75  respectively. In the meantime, since the charged pigment particles  72  in the display solutions  71 ,  73  and  75  controlled by the electric field are dispersed on the bottom substrate  702 , the incidental light reflected by the anisotropic reflective plates  711  is reflected or scattered by the white particles  72 . Afterwards, the light reflected or scattered from each color solution radiates and is mixed into an even white light of this embodiment. Otherwise, both the backlight and the surrounding light pass through the display solutions  71 ,  73  and  75  completely and are reflected or scattered so as to become an efficient display cell. 
     FIG. 7B  is a lateral view of the third embodiment of the present invention in a black state. The color display cell  70  includes at least three primary color sub-display cells. The light emits through the gap of the absorbing plate  712  of the bottom substrate  702 , and enters the transparent partitioning walls  76 . Then the light hits the top substrate  701 , and the anisotropic reflective plates  711  thereof reflect the incidental light to the spaces filled with the display solutions  71 ,  73  and  75  respectively. In this embodiment, since the white particles  72  are dispersed leaning against the partitioning walls  76 , the bottom of the space shows the black absorbing plate  712 , which absorbs the incidental light so as to radiate in the black state of the color display cell  70 . 
     FIG. 7C  shows the red state of the third embodiment. The pigment particles  72  in the green display solution  73  and the blue display solution  75  are dispersed leaning against the partitioning walls  76  due to the action of the electric field, then the bottom substrate  702  allows the black absorbing plate  712  to be seen yet doesn&#39;t reflect or scatter any chromatic light. However, the pigment particles  72  in the red display solution  71  are dispersed on the bottom substrate  702  so as to reflect the incidental light reflected by the anisotropic reflective plates  11 . The reflected light passes through the red display solution  71  so as to radiate in a red state. 
   The aforementioned embodiments show the color display cell  72  can display a variety of states since the pigment particles  72  thereof vary based on the action of the electric field. 
     FIG. 8A  is a lateral view of the fourth embodiment of the present invention in a white state. These micro-structure spaces of the display cell isolated by the partitioning walls  86  between the top substrate  801  and the bottom substrate  802  are filled with transparent display solutions  81   a ,  81   b  and  81   c  having a plurality of white and reflective pigment particles  82 . The anisotropic reflective plates  811  are disposed along the top substrate  801  relative to the position of the partitioning walls  86 . Furthermore, red, green and blue filters  821 ,  823  and  825  with transparent material are disposed along the bottom substrate  802  relative to the position of the micro-structure space. The white state of the display cell is created by mixing the primary colors for each sub-display cell. The light emits from the backlight module installed on the one side of the bottom substrate  802  to the anisotropic reflective plates  811  of the top substrate  801  through the partitioning walls  86 . Then the reflected light goes through the display solutions  81   a ,  81   b  and  81   c  of the sub-display cells. Meanwhile, the charged pigment particles  82  therein are dispersed upon the substrate  802  due to the action of the electric field. After that, the incidental light reflects and passes through the red filter  821 , the green filter  823  and the blue filter  825 , finally forming white light. The surrounding light can be incorporated as the light source of the present embodiment; both the backlight and the surrounding light are used to enhance the displaying efficiency. 
     FIG. 8B  shows the green state of the display cell having the red filter  821 , the green filter  823  and the blue filter  825  on the top substrate  801 . The pigment particles  82  are changed due to the action of the electric field. The various states of the pigment particles  82  cause various displaying effects because of the mixture of the primary colors. As shown in the diagram, the pigment particles  82  in the display solutions  81   a  and  81   c  are dispersed leaning against the partitioning walls  86  due to the action of the electric field. When the light hits the black absorbing plates  812  on the bottom substrate  802  through the display solutions  81   a  and  81   c , no red or blue light is reflected from these sub-display cells. But the pigment particles  82  in the display solution  81   b  are dispersed upon the bottom substrate  802 . Finally, the incidental light reflected or scattered by the pigment particles  82  passes through the green filter  823  so as to radiate green light. 
   If the white particles are changed to pigment particles with absorbing material, the white state of the display cell will be shown as the fifth embodiment of the present invention. The micro-structure spaces filled with the red display solution  71 , the green display solution  73  and the blue display solution  75  respectively are isolated by the partitioning walls  76  between the top substrate  701  and the bottom substrate  702 . Bottom reflective plates  912  are disposed along the bottom substrate  702  relative to the position of the display solutions  71 ,  73  and  75 . The aforementioned bottom reflective plate  912  can be a scattering-type reflective plate. The pigment particles  92  with absorbing material are dispersed leaning against the partitioning walls  76  due to the action of the electric field. After that, the light reflected by the anisotropic reflective plates  711  is reflected by the bottom reflective plates  912  and passes through the display solutions  71 ,  73  and  75  with red, green and blue colors so as to radiate in a white state. 
   Reference is made to  FIG. 9B , which shows the fifth embodiment of the present invention in a black state. The charged pigment particles  92  are dispersed upon the top substrate  701 , so the light reflected by the bottom reflective plates  912  is blocked by the pigment particles  92  so as to display a black state. The states of the pigment particles can be changed to display various effects based on the action of the electric field. 
     FIG. 10A  is a lateral view of the sixth embodiment of the present invention in a white state. The micro-structure spaces are filled with the transparent display solutions  81   a ,  81   b  and  81   c . Wherein, a color display cell of the present embodiment includes red, green and blue sub-display cells having the plurality of pigment particles with absorbing material. The charged pigment particles  12  vary according to the action of the electric field. The pigment particles  10  are dispersed leaning against the partitioning walls  86  of the embodiment, and the light is reflected or scattered by the bottom reflective plates  12  as it passes through the filters  821 ,  823  and  825  and displays white light by mixing the primary colors. 
     FIG. 10B  is a lateral view of the sixth embodiment of the present invention in a green state. The pigment particles  10  in the display solutions  81   a ,  81   b  are dispersed upon the top substrate  801 , and used to block the light reflected or scattered by the bottom reflective plates  12 , so the reflected or scattered light won&#39;t pass through the red filter  821  and the green filter  823 . Nevertheless, the pigment particles  10  in the display solution  81   c  are dispersed leaning against the partitioning walls  86 , so the light reflected or scattered by the bottom reflective plate  12  will pass through the blue filter  825  so as to radiate in a blue state. 
     FIG. 11A  and  FIG. 11B  show the seventh embodiment of the present invention. The red filter  115 , the green filter  116 , the blue filter  117  and the bottom reflective plates  118  are disposed on the bottom substrate  702  of the sub-display cells. The light reflected or scattered by the bottom reflective plate  118  goes through the red, green and blue filters so as to show various colors. The bottom reflective plates  118  of the other embodiments can be the respective primary colors reflective plates for each sub-display cell. The light reflected or scattered by the mentioned bottom reflective plates can be used to show various effects. Otherwise, the light source can be a backlight, a surrounding light, or both. 
     FIG. 11A  shows the white state of this embodiment. The pigment particles  92  in the display solutions  81   a ,  81   b  and  81   c  are dispersed leaning against the partitioning walls  76 . The light reflected or scattered by the bottom reflective plates  118  passes through each filter  115 ,  116  and  117  respectively, and radiates white light by mixing the primary colors evenly. 
     FIG. 11B  shows the red state of the display device. The pigment particles  92  are dispersed to block the reflected or scattered light in the display solutions  81   b  and  81   c , so that no light is emitted. But the pigment particles  92  with absorbing material in the display solution  81   a  are dispersed leaning against the partitioning walls  76 , so the light reflected or scattered by the bottom reflective plate  118  passes through the red filter  115  so as to finally display a red state. 
   Furthermore, one or a plurality of light guides is installed in the aforementioned space isolated by the partitioning walls in the display device. Reference is made to  FIG. 12A , which is a lateral view of the eighth embodiment of the transflective electrophoretic display device. The light from the backlight module emits to the anisotropic reflective plates  403  of the top substrate  401  through the partitioning walls  405 , and is reflected to the display solution thereof. However, a light guide  120  connected with the top substrate  401  and the bottom substrate  402  is installed in the space. The backlight can be emitted to the top substrate  401  through the light guide  120 . After that, the light is reflected to the display solution by the anisotropic reflective plate  403 ′ disposed at a position relative to the light guides. Whereby, the light guide can enhance the brightness of the transflective electrophoretic display device and facilitate the displaying effect. 
     FIG. 12B  is an overlooking view of the display device with the light guide  120 .  FIG. 12C  is the overlooking view of the display device with a plurality of light guides  120  disposed between the top substrate and the bottom substrate of the present invention. 
   The invention may be embodied in other specific forms without departing from the sprit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.