KR20180132899A - A subtractive color electrophoretic display device and a manufacturing method thereof - Google Patents

Abstract

The present invention relates to a subtractive color electrophoretic display device and a method of manufacturing the same. A pixel array including a plurality of pixel units, a first substrate and a second substrate which are relatively installed, at least three public electrodes formed on the lower surface of the first substrate, and a display electrode array formed on the upper surface of the second substrate, Wherein each of the pixel units includes a microcup layer provided between the display electrode and the common electrode, and the microcup layer is disposed between the display electrode and the common electrode. Wherein the microcup layer comprises at least one microcup structure, and in the case of a plurality of microcup structures, the plurality of microcup structures is formed of a microcup wall, an exhibition medium is installed in the microcup structure, The display medium includes electrophoretic fluid and charged particles distributed in the electrophoretic fluid. The present invention realizes high brightness color display of various colors, increases the update speed, and ensures display stability and high color intensity reproduction.

Description

A subtractive color electrophoretic display device and a manufacturing method thereof

The present invention relates to an electrophoretic display device, and more particularly, to a subtractive color electrophoretic display device and a manufacturing method thereof.

The principle of an electrophoretic display (EPD) is to display an image in such a way that the charged pigment particles are directed through a DC electric field. The basic structure of the electrophoretic display device is to fill an exhibition medium layer composed of a predetermined thickness and a predetermined amount of charged pigment particles and an electrophoretic solution between two electrodes. In order to prevent aggregation of charged particles, The microcup layer or the microcapsule layer is formed by dividing the microcups into a large amount of microcups or a subcategory of microcapsules. When a voltage is applied to two electrodes to form an electric field, the particles move in the direction of the electric field or in the opposite direction of the electric field, and stop moving when they reach the substrate electrode. Since the charged particles and the electrophoresis solution have similar densities, they can be stopped at any position for a long period of time, and this is the theoretical basis for the electrophoresis apparatus to have storability.

The electrophoretic display device is widely used in the field of transmitting static drawing character information, for example, an electronic book or an electronic newspaper publication, and the display function is the closest to the paper. The electrophoretic display device The display content is provided with storability, and the display content does not disappear without applying electricity. Particles of an electrophoretic display device have diffuse reflection characteristics, and particles of different colors are diffused or absorbed by ambient light when displaying an image, which is the same as the characteristics of a paper printing ink. A particle-type electrophoretic display device is one of display devices which can realize a high reflectance as compared with a reflection-type liquid crystal display device.

Although the electrophoretic display device has a dominance similar to that of the above-mentioned paper and a high reflectance, it has been difficult to realize a high-quality colored screen, thereby limiting the wide use of the electrophoretic display device. Among the existing technologies, a colored luminescent film is formed on an electrophoresis type display medium, and a colored luminescent film is fixed on an electrophoresis type display medium through an adhesive layer. At this time, After passing through the film, the white charged particles in the electrophoretic solution reflect the extraneous light and then transmit again through the colored luminescent film to reproduce the color. The method of realizing a colored screen by such a method has a problem in that the efficiency of color reproduction of the colored luminescent film is low, and is influenced by the light saturation of the electrophoretic display device and the implementation of brightness. In addition, although the use of multiple colored particles can exhibit color, there is a problem that it is difficult to control the movement characteristics of various kinds of charged pigment particles. The electrophoresis rate is difficult to control the motion trajectory of the particles due to different behaviors depending on factors such as type of charged particles, particle size and concentration, intensity of external applied electric field, distribution and direction, and kind of electrophoretic liquid, Is not easy to realize. Taken together, it is still necessary to overcome many technical problems in realizing electrophoretic color display with excellent color saturation and brightness.

The present invention provides a subtractive color electrophoretic display device and a method of manufacturing the same according to the above problems.

Technical means of the present invention are as follows.

A subtractive color electrophoretic display device comprising: a pixel array including a plurality of pixel units; a first substrate and a second substrate which are relatively installed; at least three public electrodes formed on a lower surface of the first substrate; Wherein the display electrode array includes a plurality of display electrodes, the display electrodes and the at least three common electrodes correspond to the driving electrodes of the pixel units,

Wherein each pixel unit includes a microcup layer provided between the display electrode and the common electrode, wherein the microcup layer includes at least one microcup structure, and when a plurality of microcup structures are provided, Wherein the display medium includes electrophoretic fluid and charged particles dispersed in the electrophoretic fluid, wherein the display electrode and the common electrode differ from each other And the charged particles move in the electrophoretic solution according to the electric field direction, and the charged particles include at least four kinds.

When four types of charged particles are included, one charged white particle and three charged pigment particles are included.

The three types of charged pigment particles include charged blue particles, charged magenta particles, and charged yellow particles. The microcup structure may have a volume smaller than 10 < ^{7 >} m < ³ >, the longitudinal direction of the microcup structure is perpendicular to the longitudinal direction of the hollow electrode, The car is smaller than 50 μm.

Further, between the display electrodes and the different common electrodes, electric fields having different directions and intensities are formed.

In addition, a plurality of TFT driving units, each of which is connected to each display electrode, are provided on the upper surface of the second substrate, and the axial direction of each of the common electrodes coincides with the direction of the gate electrode lead or the source electrode lead of the TFT driving unit And the microcup layer is in direct contact with the display electrode and the common electrode or isolated through the insulating film, and the length or width of the display electrode is smaller than the sum of the widths of the respective common electrodes of less than 50 mu m.

The irregular structure may include a plurality of internal concave portions and a plurality of external convex portions, and each of the plurality of common electrodes may include a plurality of convex portions, And transferred to the transfer electrode formed on the upper surface of the second substrate.

When the charged white particles in the microcup structure of any one of the pixel units cover all of the common electrodes, the corresponding pixel unit forms a white color, and the charged blue particles in the microcup structure of one of the pixel units When all of the electrodes are covered, the corresponding pixel unit forms a blue color. When the charged magenta particles in the microcup structure of one pixel unit cover all the common electrodes, the corresponding pixel unit forms magenta, When the charged yellow particles in the microcup structure of the pixel unit cover all the common electrodes, the corresponding pixel unit forms a yellow color.

In the case where the number of the public electrodes is three, the charged blue particles in each microcup structure of one of the pixel units is a first electrode, a second electrode, and a third electrode, And when the charged magenta particles and the charged yellow particles are coated with two different common electrodes, the corresponding pixel unit forms black, and the transmittance of the charged blue particles in each microcup structure and the area of the covered electrode covered therewith , The light transmittance of the charged magenta particles, the area of the area of the common electrode covered by the magenta particles, and the area of the area of the common electrode covered by the charged yellow particles are the same, When any two of the particles, the charged magenta particles and the charged yellow particles, are covered with the public electrodes different from the charged white particles, the corresponding pixel unit corresponds A magenta color, a green color or a blue color is formed, and any two or three of the charged white particles, the charged blue particles, the charged magenta particles and the charged yellow particles in each microcup structure of one pixel unit are coated with different public electrodes The corresponding pixel unit correspondingly forms a plurality of different colors, and for at least two pixel units, the charged blue particles included in the different pixel units, the charged magenta particles and the charged yellow particles, When each different common electrode is covered, the at least two pixel units correspondingly form red, green or indigo.

The present invention also provides a manufacturing method of the subtractive color electrophoretic display device, wherein the display electrode arrangement and the first positional correspondence mark corresponding to at least three public electrodes are formed on the upper surface of the second substrate, Forming at least three public electrodes on the lower surface of the first substrate and a second position corresponding mark corresponding to the display electrode arrangement on the lower surface of the first substrate; Filling the electrophoretic liquid and the charged particles in the microcup structure, wherein each microcup structure of each pixel unit has at least three common electrodes crossed to form a microcup layer; a first position corresponding marker and a second position The first position correspondence mark and the at least three public electrodes are made to correspond to each other and the second position correspondence mark and the display electrode arrangement are made to correspond to each other, And adhering and laminating the second substrate in positional correspondence.

In addition, in the above manufacturing method, a plurality of TFT driving units, each of which is connected to each display electrode, are formed on the upper surface of the second substrate after the display electrode array is formed on the upper surface of the second substrate, and at least three transfer electrodes are formed , At least three transfer electrode-based anisotropic conductive films or anisotropic conductive adhesives are printed.

The present invention provides a subtractive color electrophoretic display device and a method of manufacturing the same by using the above-described technology. The present invention provides a subtractive color electrophoretic display device and a method of manufacturing the same, wherein one display electrode is moved in correspondence with charged particles between three common electrodes, The particle concentration was reduced by allowing the minimum number of charged particles to be used in the space, and the updating speed was improved by realizing multi-colored high-light color display. The present invention ensures sufficient color mixing of at least four kinds of charged pigment particles on at least three common electrodes in a single pixel unit to ensure display stability and high color reproducibility.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a distribution diagram of the electrophoretic display device of the present invention; Fig.
2 is a side view of the electrophoretic display device of the present invention.
Figs. 3, 4 and 5 are sectional guide views of the microcup structure of the present invention. Fig.
Fig. 6 is a view showing an example of the edge structure of the public electrode of the present invention.

In the subtractive color electrophoretic display device shown in Figs. 1, 2, 3, 4, 5 and 6, a pixel array including a plurality of pixel units, a first substrate 1 and a second substrate 2, And a display electrode array formed on an upper surface of the second substrate (2), wherein the display electrode array includes a plurality of display electrodes (3), and each of the display electrodes (3) and the at least three public electrodes correspond to a driving electrode of each pixel unit, and each of the pixel units is provided between the display electrode (3) and the common electrode Wherein the microcup structure comprises at least one microcup structure and wherein when the microcup structure is a plurality of microcup structures, a plurality of microcup structures are arranged in the microcup wall 8, and in the microcup structure 7, Wherein the display medium includes electrophoretic fluid 9 and charged particles distributed in the electrophoretic liquid 9. The display electrode 3 and the different common electrodes can form an electric field, , The charged particles move in the electrophoretic liquid (9) along the electric field direction, and the charged particles include at least four kinds.

When four types of charged particles are included, one charged white particle and three charged pigment particles are included.

The three types of charged pigment particles include charged blue particles, charged magenta particles, and charged yellow particles.

The microcup structure 7 has a volume smaller than 10 ⁷ μm ³ and the longitudinal direction of the microcup structure 7 is perpendicular to the longitudinal direction of the hollow electrode. And the sum of the widths of the respective common electrodes is smaller than 50 mu m.

Further, between the display electrodes 3 and the different common electrodes, electric fields having different directions and intensities are formed.

A plurality of TFT driving units 13 connected to the respective display electrodes 3 are provided on the upper surface of the second substrate 2. The axial directions of the respective common electrodes are all connected to the TFT driving unit 13, The microcup layer is in direct contact with the display electrode 3 and the common electrode or is isolated through the insulating film 16 and the display electrode 3 and the common electrode are aligned with the direction of the gate electrode lead 14 or the source electrode lead 15 of the display electrode 3, Irregular structures are provided in which the length or width of the common electrode 3 is smaller than the sum of the widths of the respective common electrodes and the public electrodes are spherical or are symmetrical with each other at adjacent edges of the different public electrodes, The structure includes a plurality of internal concave portions and a plurality of external convex portions, and each of the public electrodes is transferred to a transfer electrode formed on the upper surface of the second substrate 2.

Further, when the charged white particles in the microcup structure 7 of any one pixel unit cover all the common electrodes, the corresponding pixel unit forms a white color, When the charged blue particles cover all the common electrodes, the corresponding pixel unit forms blue color, and when the charged magenta particles in the microcup structure 7 of one of the pixel units covers all the common electrodes, The unit forms magenta, and when the charged yellow particles in the microcup structure 7 of any one pixel unit cover all the common electrodes, the corresponding pixel unit forms a yellow color.

In the case where the number of the public electrodes is three, the first electrode 4, the second electrode 5, and the third electrode 6 are provided. In the microcup structure 7 of one pixel unit, When the blue particles cover one of the three public electrodes and the charged magenta particles and the charged yellow particles cover the other two common electrodes, the pixel unit forms black; The ratio of the transmittance of the charged blue particles in the microcup structure 7 to the area of the common electrode covered by the microcup structure 7, the ratio of the transmittance of the charged magenta particles to the area of the common electrode covered therewith and the transmittance of the charged yellow particles, The areas of the common electrodes are all the same, and the charged blue particles in each microcup structure 7 of one pixel unit, arbitrary two of the charged magenta particles and the charged yellow particles are coated with a different public electrode from the charged white particles, The corresponding pixel unit correspondingly forms red, green or indigo, and any one of the charged white particles, the charged blue particles, the charged magenta particles and the charged yellow particles in each microcup structure 7 of one pixel unit When two or three kinds of paper are covered with different public electrodes, the pixel unit correspondingly forms a plurality of different colors, and at least two pixel units , The at least two pixel units are correspondingly red, green or blue when they respectively cover different common electrodes through any two of the charged blue particles, the charged magenta particles and the charged yellow particles contained in the different pixel units It forms indigo blue.

The method of manufacturing the subtractive color electrophoretic display device according to claim 1, further comprising: forming a display electrode array on the upper surface of the second substrate (2) and a first positional correspondence mark corresponding to at least three public electrodes; 1, at least three public electrodes and a second position corresponding mark corresponding to the display electrode arrangement are formed on the lower surface of the microcup wall 8 and the microcup structure 7, Filling the electrophoretic liquid 9 and the charged particles in the microcup structure 7, each microcup structure 7 of each pixel unit skipping at least three common electrodes to form a microcup layer The first position correspondence mark and the second position correspondence mark are used to position correspondence between the first position correspondence mark and at least three public electrodes and position correspondence between the second position correspondence mark and the display electrode arrangement, 1) and the second substrate (2) And a step of laminating on the adhesive.

A plurality of TFT driving units connected to the display electrodes 3 are formed on the upper surface of the second substrate 2 after the display electrode array is formed on the upper surface of the second substrate 2. At least three transfer electrodes And an anisotropic conductive film or an anisotropic conductive adhesive is printed on at least three of the precautionary electrodes.

The space formed between the microcup structure 7 of the present invention and the first substrate 1 and the second substrate 2 can ensure that the charged particles do not aggregate and that the electrophoretic liquid 9 The microcup structure 7 in which the pixel unit is included in the microcup structure 7 is moved in a plurality of mutually parallel plural numbers when the pixel unit is oversized because the microcup structure moves freely in a space of 10 ⁷ 탆 ³ or more, The length of each microcup structure 7 should be perpendicular to the longitudinal direction of the common electrode and the length of the microcup structure 7 should be equal to the width of each of the common electrodes 7, Is less than 50 mu m, the migration of the charged particles is not affected and the occurrence of coagulation phenomenon can be prevented.

The display electrode 3 of the present invention forms an electric field having different directions and intensities from the different common electrodes, and when the number of the public electrodes of any one pixel unit is three, the display electrode 3 and the first electrode An electric field having different directions and intensities is formed between the display electrode 3 and the second electrode 5 and between the display electrode 3 and the third electrode 6 between the pair of electrodes 4, The electrophoretic display device of the present invention can be provided with various electric field environments to drive the movement of the particles because the electric field of each polarity can also have different electric field strengths And the brightness of the charged particles is inversely proportional to the area of the common electrode at the top of the microcup structure 6 in which it is located, thereby achieving a sufficient and balanced subtractive color mixture.

In the present invention, the sum of the area of the display electrode 3 and the area of each of the common electrodes in one pixel unit is equal or similar, and the areas of the different common electrodes may be the same or different. The shape of the common electrode may be spherical, and adjacent edges of the different public electrodes are provided with irregular structures that are symmetrical to each other. The irregular structure may include a plurality of internal concave portions and a plurality of external convex portions, and may be saw-toothed, semicircular or spherical apart from each other, and the like. The electrophoretic display device also includes a sealing agent 17 provided at the edge positions of the first substrate 1 and the second substrate 2. The encapsulant 17 is used to seal the first substrate 1 and the second substrate 2.

The public electrode is a transparent electrode, whereby the charged particles adhering on the public electrode are reflected to ambient light to realize image display. The higher the transmittance of the common electrode, the higher the reflectance of the display device. The common electrode may be made of ITO material, PEDOT material, graphene or nano-silver wire material. The display electrode 3 may be a transparent electrode or a non-transparent electrode. In connection with active devices, the use of metal electrodes can reduce cost, reduce the number of photoetching cycles, and reduce the complexity of the production process. Any one of the charged particles in each microcup structure 7 can freely move between the display electrodes 3 and the different public electrodes. More specifically, for example, between the display electrode 3 and the first electrode 4, between the display electrode 3 and the second electrode 5, and between the display electrode 3 and the third electrode 6 Lt; / RTI > Each of the common electrodes is transferred to each transfer electrode formed on the upper surface of the second substrate 2. Specifically, the first electrode 4 is electrically connected to the first transfer electrode 10 The second electrode 5 is transferred to the second transfer electrode 11 formed on the upper surface of the second substrate 2 and the third electrode 6 is transferred onto the upper surface of the second substrate 2, And transferred to the third transfer electrode 12 where the anisotropic conductive film, the anisotropic conductive adhesive or the metal spherical particles are added. In addition, the first substrate 1 and the second substrate 1, The movement between the first substrate 2 and the second substrate 2 can be realized. The first electrode 4 and the second transfer electrode 11 and the third transfer electrode 12 are isolated through at least one insulating film 16 and the second electrode 5 and the first transfer electrode 12, Between the third electrode 6 and the first transfer electrode 10 and between the second transfer electrode 11 and the third transfer electrode 10 is isolated through at least one insulating film 16, It is the most convenient transfer method that the public electrodes and the transfer electrodes which are isolated through at least one insulating film 16 and arranged in a repeated manner are mutually orthogonal. When all of the first transfer electrode 10, the second transfer electrode 11 and the third transfer electrode 12 are located on the display region side, the insulating film 16 is formed on the two pre- The two transfer electrodes and the non-corresponding common electrode should be isolated.

Specifically, the first electrode 4 may be extended outermost to realize a conductive connection through the first transfer electrode 10 and the anisotropic conductive film. The second transfer electrode 11, the third transfer electrode 12, and the third transfer electrode 12 are formed on the second transfer electrode 11 and the third transfer electrode 12. In order to avoid crossing points when the first electrode 4 skips over the second transfer electrode 11 and the third transfer electrode 12, An insulating film is formed on the transfer electrode 12. [ Likewise, the second electrode 5 is stretched between the first electrode 4 and the third electrode 6, and even when the second electrode 5 skips over the third transfer electrode 12, Similarly, isolation should be avoided. Thus, an insulating film is formed on the third transfer electrode 12.

When the first transfer electrode 10, the second transfer electrode 11 and the third transfer electrode 12 are located on both sides of the display area, an insulating film is formed on one transfer electrode, Non-compliant public electrodes should be isolated. Specifically, the first electrode 4 may be extended outermost to realize the conductive connection through the first transfer electrode 10 and the anisotropic conductive film. One intersection occurs when one side of the first electrode 4 skips over the second transfer electrode 11 and the third transfer electrode 12 and the second transfer electrode 11 and the second transfer electrode 12 are formed in order to isolate and avoid interference. An insulating film is formed on the third transfer electrode 12. On the other side, there is no intersection of the non-corresponding electrodes, so no intersection occurs.

When the first transfer electrode 10, the second transfer electrode 11 and the third transfer electrode 12 are located at three sides of the display area, the lines of the public electrodes forming the array are complicated, , And the effect is smaller than in the case of the one side or both sides. 1 shows a layered guide diagram of the electrophoretic display device of the present invention, wherein I represents a layer in which a public electrode is located, and includes, for example, a first electrode 4, a second electrode 5, And an electrode (6). II, III, IV and V denote a transfer electrode, a display electrode 3, a TFT drive unit 13, a source electrode lead (not shown) 15, and the gate electrode lead 14 are located,

IV denotes a display electrode 3, and V denotes a TFT drive unit 13, a source electrode lead 15, and a gate electrode lead 14, respectively. C and C in Figs. 3 and 4 indicate blue, M indicates magenta, Y indicates yellow, and W indicates white. The arrows shown in Fig. 5 indicate the electric field direction between the display electrodes 3 and the different common electrodes.

The electrophoretic velocity of the display medium of the present invention and the kind of the charged particles are related to the concentration and the particles can move between the display electrode 3 and the common electrode within a finite space and improve the contribution to the display reflection of the mediating particles And the concentration of the particles can be lowered to speed up the electrophoresis so that the updating speed of the electrophoretic display device can be further enhanced. When the plurality of pixel units are all black, the final decolorizing effect must be achieved by ensuring that the arrangement order of the charged pigment particles of each pixel unit is the same.

The ratio of the transmittance of the charged blue particles in the microcup structure 7 to the area of the common electrode covered by the microcup structure 7, the ratio of the transmittance of the charged magenta particles to the area of the common electrode covered therewith and the transmittance of the charged yellow particles, The areas of the common electrodes are all the same, and the optimal subtractive color mixing effect is formed, thereby achieving pure black display characteristics and enhancing the contrast of the display device.

When the charged white particles in each microcup structure 7 of any one of the pixel units covers all of the common electrodes, the corresponding pixel unit forms a white color, and each microcup structure 7 of one pixel unit, The corresponding pixel unit forms a blue color, and the charged magenta particles in each microcup structure 7 of one of the pixel units are all covered with respect to each of the common electrodes , The corresponding pixel unit forms magenta, and when the charged yellow particles in each microcup structure 7 of one of the pixel units covers all of the common electrodes, the corresponding pixel unit forms a yellow color, Can cover the entire pixel unit and realizes the optimization of the color saturation and the brightness of the color under the same resolution and the same resolution.

When any two of the charged blue particles, the charged magenta particles, and the charged yellow particles in each microcup structure 7 of one pixel unit are covered with the different public electrodes from the charged white particles, the corresponding pixel units are correspondingly red , Green or indigo, and the whiteness of the red, green, and blue colors is adjusted to achieve richer color reproduction. When any two or three of the charged white particles, the charged blue particles, the charged magenta particles, and the charged yellow particles in each microcup structure 7 of one pixel unit are covered with different public electrodes, It forms a number of different colors correspondingly and differs from the full color representation, but the kind of color is already very abundant.

When at least two pixel units are coated with different public electrodes through charged blue particles, charged magenta particles and charged yellow particles, respectively, which are included in different pixel units, at least two pixel units Green, or blue color correspondingly to form a color mixture between two or more pixel units. For example, CMCMCM, CYCYCY, or MYMYMY. Among them, C represents blue, M represents magenta, Y represents yellow, MY forms red, CY forms green, and CM forms indigo. Thus, higher color saturation and brightness can be realized. For example, in the situation of CMCMCM, the first electrode 4 and the fifth electrode 5 of each microcup structure 7 of one pixel unit are covered with charged blue particles, and the third electrode 6 ) Is covered by the charged magenta particles and the first electrode 4 and the third electrode 6 of each microcup structure 7 of the other pixel unit are covered with magenta particles and the second electrode 5 ) Is coated with the charged blue particles.

The display electrode 3 of the electrophoretic display device of the present invention and one display electrode 3 of the existing technique corresponds to one common electrode or a combination of two or more subpixels, By coping with the movement of the charged particles between the common electrodes, the minimum number of charged particles can be used in one pixel unit space, thereby lowering the particle concentration, achieving high color display of multiple colors and improving the update speed. Among them, one active electrode and two common electrodes are limited in the mixing method, three or two active electrodes correspond to one passive electrode, and the electrodes are shifted from the upper and lower substrates And the aperture ratio of the TFT severely affects the luminous intensity of the electrophoretic type, so that the beneficial effect of the present invention can not be achieved. In the present invention, at least three kinds of charged pigment particles are sufficiently mixed in at least three public electrodes in a single pixel unit to ensure display stability and high color reproducibility.

The display principle of the electrophoretic display device of the present invention will be described with reference to the following specific application examples. The structure and resolution of the subtractive color mixture will be further described by way of example. Many modifications and variations are apparent to those skilled in the art, including the size of the display, the type of substrate, and the installation of the storage capacitance. Specifically, in the subtractive color electrophoretic display device, the resolution is 200 ppi, the size of the pixel unit is 127 x 127 mu m, the height of the microcup layer is 80 mu m, and the aperture ratio of the TFT drive unit 13 is 72% 3) is about (67x67 + 60x120) μm, and the design for each public electrode such area is specifically size is Lx40μm ^2, that from the L is a public electrode length in the shape zone, 127 μm of the number of pixel units , The area of each pixel unit is 127x40 mu m ² ,

The number of the installed public electrodes is three, that is, the first electrode 4, the second electrode 5 and the third electrode 6, and the gap between the common electrodes is 2.3 μm. Specifically, the interval between the first electrode 4 and the third electrode 6, the distance between the third electrode 6 adjacent to the pixel unit and the first electrode 4 is 2.3 μm, which can be deduced in order. Each pixel unit is constituted by two microcup structures 7, the microcup structure 7 is in the shape of a date, the center size is 127 x 63.5 m, and between the adjacent pixel units the microcup wall 8 is used jointly , The display medium is sealed by the substrate on the microcup wall 8 and the resin insulating film and the mixed liquid of the electrophoretic fluid 9 and the charged particles and the common electrode come into direct contact with each other, and the first electrode 4, The axial direction of the electrode 5 and the third electrode 6 coincides with the direction of the gate electrode lead 14. Fig. 6 is an illustration of an edge structure of a public electrode. Specifically, irregular structures symmetrical to each other are provided on adjacent edges of different public electrodes. The irregular structure includes a plurality of internal concave portions and external convex portions, 6 < / RTI > The number of saw teeth of a single pixel unit can be freely designed and the first electrode 4 and the third electrode 6 can be provided with saw blades at the one side edge and the saw blade can be provided at both sides of the second electrode 5 have. The irregular structure of symmetry provided on the adjacent edge of the common electrode increases the number of the mixing zones and further improves the color mixing effect and provides the optimum subtractive color mixing effect.

The first electrode 4, the second electrode 5 and the third electrode 6 are made of an ITO electrode material and the display electrode 3 is made of an aluminum electrode. The transfer electrode is provided on both sides, 6, had an insulating layer of the insulating layer and the TFT driving unit 13 at one of the first electrode (4), may be a SiNx or SiO _2. The microcup layer contains microcup wall 8, electrophoresis liquid 9 and charged particles, and one kind of charged white particles, charged blue particles, charged magenta particles and charged yellow particles are contained in each microcup structure 7 have. The application example realizes subtractive color mixing of at least blue (C), magenta (M), and yellow (Y) color systems using one active driving electrode and three or more common electrodes and realizes color display like white charged particles . The present invention provides an electrophoretic display device having a low cost and high degree of saturation and high color saturation.

The above description is merely illustrative of preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. Those skilled in the art will readily appreciate that within the technical scope of the present invention, the same or similar modifications are to be included within the scope of the present invention in accordance with the technical idea of the present invention and the main idea of the present invention.

1. First substrate 2. Second substrate 3. Display electrode
4. First electrode 5. Second electrode 6. Third electrode
7. Microcup structure 8. Microcup wall 9. Electrophoretic solution
10. First transfer electrode 11. Second transfer electrode 12. Third transfer electrode
13. TFT drive unit 14. Gate electrode lead 15. Source electrode lead
16. Insulation film 17. Sealant

Claims (10)

In a subtractive color electrophoretic display device,
A pixel array including a plurality of pixel units,
The first substrate and the second substrate, which are relatively installed,
At least three public electrodes formed on the bottom surface of the first substrate, and
And a display electrode array formed on an upper surface of the second substrate,
The display electrode array includes a plurality of display electrodes, each of the display electrodes and the at least three common electrodes corresponding to each other constitute a driving electrode of each pixel unit,
Wherein each pixel unit includes a microcup layer disposed between the display electrode and the common electrode, wherein the microcup layer includes at least one microcup structure, and in the case of a plurality of microcup structures, A micro-cup wall,
Wherein the display medium includes electrophoretic fluid and charged particles dispersed in the electrophoretic fluid, electric fields can be formed between the display electrode and the different public electrodes, Wherein the charged particles move in the electrophoretic solution according to an electric field direction, and the charged particles include at least four kinds. The method according to claim 1,
Wherein when the charged particles are four kinds, the charged fine particles include one charged white particle and three charged pigment particles. 3. The method of claim 2,
Wherein the three types of charged pigment particles include charged blue particles, charged magenta particles, and charged yellow particles. The method according to claim 1,
Wherein the microcup structure has a volume smaller than 10 < ^{7 >} m < ³ >, a longitudinal direction of the microcup structure is perpendicular to a longitudinal direction of the hollow electrode, Of the electrophoresis type electrophoretic display device. The method according to claim 1,
Characterized in that an electric field having different directions and intensities is formed between the display electrodes and the different common electrodes. The method according to claim 1,
And a plurality of TFT driving units connected to the respective display electrodes are provided on the upper surface of the second substrate and the axial directions of the respective common electrodes are aligned with the direction of the gate electrode lead or the source electrode lead of the TFT driving unit,
The microcup layer is in direct contact with the display electrode and the common electrode or is isolated through the insulating film,
The length or the width of the display electrode is smaller than the sum of the widths of the respective common electrodes of less than 50 mu m,
Wherein the irregular structure includes a plurality of internal concave portions and a plurality of external convex portions, and each of the plurality of common electrodes has a plurality of convex portions, Is transferred to a transfer electrode formed on the upper surface of the second substrate. The method of claim 3,
When the charged white particles in the microcup structure of any one pixel unit cover all the common electrodes, the corresponding pixel unit forms a white color,
When the charged blue particles in the microcup structure of any one pixel unit covers all the common electrodes, the corresponding pixel unit forms blue color,
When the charged magenta particles in the microcup structure of any one pixel unit cover all the common electrodes, the corresponding pixel unit forms a magenta color,
Characterized in that when the charged yellow particles in the microcup structure of any one pixel unit covers all the common electrodes, the pixel unit forms a yellow color. The method of claim 3,
When the number of the public electrodes is three, the first electrode, the second electrode,
When the charged blue particles in each microcup structure of one pixel unit covers one of the three public electrodes and the charged magenta particles and the charged yellow particles cover two different public electrodes, Lt; / RTI >
The ratio of the transmittance of the charged blue particles in the microcup structure to the area of the common electrode covered by the microcup structure, the ratio of the transmittance of the charged magenta particles and the area of the common electrode covered therewith, the transmittance of the charged yellow particles, The areas are all the same
When any two of the charged blue particles, the charged magenta particles and the charged yellow particles in each microcup structure of one pixel unit are covered with the public electrodes different from the charged white particles, the corresponding pixel units are correspondingly red, green or blue Forming a blue color,
When any two or three of the charged white particles, the charged blue particles, the charged magenta particles, and the charged yellow particles in the respective microcup structures of any one of the pixel units are covered with the different public electrodes, the corresponding pixel units are correspondingly plural Of different colors,
When at least two pixel units are covered with different types of public electrodes via charged blue particles, charged magenta particles and charged yellow particles, which are included in different pixel units, the at least two pixel units correspond to each other Wherein the red, green or blue color is formed. The method of manufacturing a subtractive color electrophoretic display device according to any one of claims 1 to 8,
Forming a display electrode array on the upper surface of the second substrate and a first positional correspondence mark corresponding to at least three common electrodes,
Forming at least three public electrodes on the lower surface of the first substrate and a second position corresponding mark corresponding to the display electrode arrangement,
Forming a microcup wall and a microcup structure on the bottom surface of at least three of the common electrodes, filling the microcup structure with electrophoretic fluid and charged particles, and each microcup structure of each pixel unit skipping at least three of the common electrodes Forming a microcup layer,
By matching the first positional correspondence mark and the at least three public electrodes with the first positional correspondence mark and the second positional correspondence mark so that the second positional correspondence mark and the display electrode arrangement correspond to each other, 2 substrates are aligned and laminated in such a manner that the substrates are aligned with each other. 10. The method of claim 9,
A plurality of TFT driving units connected to the respective display electrodes are formed on the upper surface of the second substrate, and at least three transfer electrodes are formed, and at least three transfer electrodes are formed on the upper surface of the second substrate, Characterized in that a conductive film or an anisotropic conductive adhesive is printed.

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