JP2005283789A - Display device and its display driving method, and method for manufacturing display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which is applicable to electronic paper and employs a reflection type display system capable of realizing bright color display while realizing relatively fast image display and to provide a display driving method and a manufacturing method for improving display characteristics of the display device. <P>SOLUTION: A display panel 10A has a two-dimensional array of display pixels, a plurality of pixel cells PEC of which are grouped; and each pixel cell PEC has an upper substrate 11 and a lower substrate 12 which are arranged opposite each other, charged particles PLc, PLy, and PLm which are charged in a space SC formed of partitions 13 and have specific color components, a lower electrode 15a formed on the lower substrate 12, a white thin film 17 covering the lower electrode 15a, and an upper electrode 14a which has smaller area than the lower electrode 15a and is formed on the upper substrate 11, an electric field being produced between the lower electrode 15a and upper electrode 14a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device, a display driving method thereof, and a display device manufacturing method. In particular, the present invention can be applied to electronic paper and can hold a display state in a fixed manner, and is thin, lightweight, and flexible. The present invention relates to a display device excellent in performance, a display driving method thereof, and a display device manufacturing method.

  In recent years, research and development of a display device called electronic paper has been actively performed as an information transmission medium replacing a paper medium such as a newspaper or a book. In such a display device, it is lightweight and thin, can display and display image information once displayed without the need for a power source or a backlight, is flexible, and bends the display panel. Various features that cannot be realized with existing display devices such as CRTs and liquid crystal display devices are attracting attention.

  Here, as a display device that is considered to be applied to electronic paper, for example, a charged particle as a display medium is contained in a solvent, and an electric field is applied according to display data so that the charged particle in the solvent is Electrophoretic type to be moved and toner (charged particles) as a display medium sealed in a space (unit cell) formed between substrates without using a solvent, and an electric field is applied according to display data. A toner type that moves the toner is known.

Hereinafter, a display device according to the related art will be briefly described.
FIG. 11 is a schematic configuration diagram illustrating an example of a display device to which an electrophoretic method in the prior art is applied, and FIG. 12 is a schematic configuration diagram illustrating an example of a display device to which a toner method in the prior art is applied.
As shown in FIG. 11, the display device 100 to which the electrophoresis method is applied is roughly composed of a transparent substrate 101 and a rear substrate 102 on the visual field side disposed opposite to each other, and the transparent substrate 101 and the rear surface side on the visual field side. A display layer in which microcapsules 110 in which a solvent 105 mixed with white and black charged particles 106 and 107 is encapsulated is arranged between electrodes 103 and 104 provided on each opposing surface side of the substrate 102 and transparent on the visual field side And a color filter 120 provided between the substrate 101 and the electrode 103 (may be on the visual field side of the transparent substrate 101). Here, the white and black charged particles 106 and 107 are charged with different polarities.

In such a display device 100, a white voltage in each microcapsule 110 is formed between the pair of substrates 101 and 102 by applying a DC voltage from a power supply 130 capable of switching a voltage application direction to form an electric field. In addition, the black charged particles 106 and 107 move and concentrate in the direction of the electrodes 103 and 104 to which voltages having opposite polarities are applied, respectively. Thereby, the light incident from the visual field side is reflected on the white or black charged particles 106 and 107 moved to the transparent substrate 101 (electrode 103) on the visual field side, and the color arranged corresponding to the microcapsule 110. By passing through the filter 120, color display (in the case of the microcapsule 110 in which the white charged particles 106 are concentrated on the electrode 103 side) or black display (in the microcapsule 110 in which the black charged particles 107 are concentrated on the electrode 103 side). In this case, the color is displayed.
A display device to which such an electrophoresis method is applied is described in detail in, for example, Patent Document 1 and the like.

  On the other hand, as shown in FIG. 12, the display device 200 to which the toner method is applied is roughly composed of a transparent substrate 201 and a rear substrate 202 on the visual field side, and a transparent substrate 201 and a rear surface on the visual field side, which are arranged to face each other. A pixel cell (unit cell) 210 in which white and black charged particles 206 and 207 are enclosed in a space formed by a side substrate 202 and a lattice-shaped partition wall (spacer) 203 provided between the substrates, and a pixel Each cell 210 has a configuration including electrodes 204 and 205 provided on the opposing surface sides of the transparent substrate 101 on the visual field side and the substrate 202 on the rear surface side. Here, the white and black charged particles 206 and 207 are charged with different polarities.

Also in such a display device 200, white and black charged particles 206 and 207 in each pixel cell 210 are formed by applying a DC voltage from the power source 220 between the pair of substrates 201 and 202 to form an electric field. , Each of the electrodes 204 and 205 to which a voltage of opposite polarity is applied moves and adheres, and the incident light from the view side is reflected on the white or black charged particles 206 and 207 attached to the view side electrode 204. As a result, white display (in the case of the pixel cell 210 with the white charged particles 206 attached to the electrode 204 side) or black display (in the case of the pixel cell 210 with the black charged particles 207 attached to the electrode 204 side) is visually recognized. Then, monochrome display is performed.
A display device to which such a toner method is applied is described in detail in, for example, Patent Document 2.

JP 2003-161822 A (page 3 to page 4, FIG. 1) JP 2002-196739 (pages 6-7, FIG. 2, FIG. 4)

However, the display device as described above has the following problems.
That is, in the display device to which the electrophoresis method as described above is applied, since the charged particles as the display medium are sealed in the solvent, an electric field is formed between the electrodes and any of the electrodes is formed. When the charged particles are moved to the side, the display state can be maintained relatively well, but the moving speed (response time) of the charged particles in the direction of each electrode is relatively slow. There was a problem that rewriting could not be performed.

  In contrast, toner-based display devices do not use a solvent, so that a relatively fast response time can be realized, but an effective configuration for achieving a good color display has not yet been developed. Only monochrome display as shown in FIG. 12 could be executed. Here, when realizing color display in a toner-type display device, for example, as shown in FIG. 13, on the transparent substrate 201 on the visual field side of the display panel 200 capable of monochrome display as shown in FIG. A configuration in which a color filter 230 in which colors are arranged corresponding to each pixel cell 210 is arranged can be considered. FIG. 13 is a schematic diagram showing a configuration in which a color filter is provided in a conventional toner display device.

  However, as described above, the display device applied to the electronic paper is required to display image information without using a power source or a backlight, so that a reflective display method is adopted. Yes. Therefore, when a color filter is disposed on the visual field side of the display panel, the intensity of reflected light is attenuated by the color filter, and there is a problem that the image display is visually recognized darkly.

  In addition, since the toner-type display device has a configuration in which charged particles are enclosed in a pixel cell constituting each display pixel without using a solvent, the charged particles are adsorbed (aggregated) and displayed. In order to prevent such adsorption, for example, it is necessary to perform special processing on charged particles, or to set a high voltage to be applied to each electrode during display operation. There is also a problem that complicated manufacturing methods and drive control methods must be used.

  Therefore, in view of the above problems, the present invention is applicable to electronic paper, and a display that adopts a reflective display method that can realize a bright color display while realizing a relatively high-speed image display. An object of the present invention is to provide a display driving method and a manufacturing method for improving the display characteristics of the display device.

  According to a first aspect of the present invention, there is provided a display panel in which pixel cells in which charged fine particles are sealed are two-dimensionally arranged in a space formed by a pair of opposing substrates and a partition formed between the substrates, and each pixel cell An electric field is formed between a pair of electrodes provided inside, and a desired display state is set by moving the fine particles to one side of the pair of electrodes according to the polarity of the electric field. In the display device for displaying image information, the pair of substrates includes a first substrate disposed on the visual field side and formed of a transparent substrate material, and a second substrate disposed on the back side. The pair of electrodes has a first electrode provided on the second substrate and a smaller area than the first electrode, and the pair of electrodes includes the first substrate and the second substrate. A second electrode provided on one of the substrates, and Particulates, for each pixel cell, and having any color.

According to a second aspect of the present invention, in the display device according to the first aspect, the second electrode is provided on the first substrate.
According to a third aspect of the present invention, in the display device according to the first aspect, the second electrode is provided on the second substrate so as to be electrically separated from the first electrode. It is characterized by that.
According to a fourth aspect of the present invention, in the display device according to any one of the first to third aspects, each of the pixel cells is provided on the second substrate so as to cover at least the first electrode. It has a white thin film, and the fine particles have a color other than white.

According to a fifth aspect of the present invention, in the display device according to the fourth aspect, the pixel cell includes the fine particles each having one of a red color, a blue color, and a yellow color. The display panel is individually enclosed and constitutes one display pixel of the display panel with the 3 system colors as a set.
According to a sixth aspect of the present invention, in the display device according to the fourth aspect, each of the pixel cells has any one of four colors of a red color, a blue color, a yellow color, and a black color. Fine particles are individually encapsulated, and one display pixel of the display panel is configured by using the four colors as a set.

According to a seventh aspect of the present invention, in the display device according to any one of the first to third aspects, each of the pixel cells includes a white fine particle having a first charge polarity and a polarity opposite to the first charge polarity. And a fine particle having a second charge polarity of a polarity and having a color other than white.
According to an eighth aspect of the present invention, in the display device according to the seventh aspect, each of the pixel cells is any one of the white fine particles and a red, blue, or yellow color. The fine particles having a color are individually encapsulated, and one display pixel of the display panel is configured with the three-system color as a set.
According to a ninth aspect of the present invention, in the display device according to the seventh aspect, each of the pixel cells includes any one of the white fine particles and four colors of a red color, a blue color, a yellow color, and a black color. The fine particles having the above colors are individually encapsulated, and one display pixel of the display panel is configured with the four colors as a set.

  According to a tenth aspect of the present invention, there is provided a display panel in which pixel cells in which charged fine particles are enclosed in a space formed by a pair of substrates arranged opposite to each other and a partition provided between the substrates are two-dimensionally arranged. A display driving method for a display device, wherein the pair of substrates are arranged on a visual field side and formed of a transparent substrate material; a second substrate arranged on the back side; The pixel cell has a first electrode provided on the second substrate and a smaller area than the first electrode, and the first substrate and the second substrate. Including a second electrode provided on any one of the substrates and a white thin film provided to cover at least the first electrode, and fine particles having a color other than white are enclosed. Between the first electrode and the second electrode. Is applied to form the first electric field to move and attach the fine particles to the second electrode side, and the white thin film on the second substrate side passes through the first substrate. The white display operation that is visible from the view side, and a voltage is applied between the first electrode and the second electrode to form a second electric field, thereby forming the fine particles into the first electrode. A color display operation for allowing the fine particles adhered to the surface of the white thin film on the second substrate side to be visually recognized from the view side through the first substrate; , Including.

  According to an eleventh aspect of the present invention, there is provided a display panel in which pixel cells in which charged fine particles are enclosed in a space formed by a pair of substrates arranged opposite to each other and a partition wall provided between the substrates are two-dimensionally arranged. A display driving method for a display device, wherein the pair of substrates are arranged on a visual field side and formed of a transparent substrate material; a second substrate arranged on the back side; The pixel cell has a first electrode provided on the second substrate and a smaller area than the first electrode, and the first substrate and the second substrate. And a second electrode provided on any one of the substrates, a white fine particle having a first charge polarity, and a fine particle having a second charge polarity and having a color other than white And the first electrode and the second electrode. By applying a voltage to the first electrode to form a first electric field, the white fine particles are moved and adhered to the first electrode side, and the fine particles having a color other than white are moved to the second electrode side. A white display operation for allowing the white fine particles attached to the surface of the first electrode on the second substrate to move and adhere to be visible from the view side through the first substrate; By applying a voltage between the second electrode and the second electrode to form a second electric field, fine particles having a color other than white are moved and adhered to the first electrode side, and the white The fine particles having a color other than white adhered to the surface of the first electrode on the second substrate are moved to and attached to the second electrode side, and the fine particles having a color other than white are viewed through the first substrate. And a color display operation that enables visual recognition from the point of view.

  A twelfth aspect of the present invention is the display driving method of the display device according to the tenth or eleventh aspect, wherein the fine particles having a color other than white are each of three colors of red, blue, and yellow. The pixel cell has one of the three colors and the fine particles having any one of the three colors are individually encapsulated, and the three colors are used as a set. A display pixel is configured, and a display color of the display pixel is set by subtractive color mixture of display colors in each pixel cell.

  A thirteenth aspect of the present invention is the display driving method of the display device according to the tenth or eleventh aspect, wherein the fine particles having a color other than white are four systems of red, blue, yellow and black, respectively. The display cell includes any one of the four colors, and the pixel cell individually encloses the fine particles having any one of the four colors, and sets the four colors as a set. One display pixel is configured, and the display color of the display pixel is set by subtractive color mixture of display colors in each pixel cell.

  According to a fourteenth aspect of the present invention, there is provided a display panel in which pixel cells in which charged fine particles are enclosed in a space formed by a pair of opposing substrates and a partition formed between the substrates are two-dimensionally arranged, and each pixel cell An electric field is formed between a pair of electrodes provided inside, and a desired display state is set by moving the fine particles to one side of the pair of electrodes according to the polarity of the electric field. In the method of manufacturing a display device that displays image information, after the fine particles are sealed in the space constituting the pixel cell, at least ultrasonic vibrations are applied to the fine particles, so that the fine particles are uniformly distributed on the electrodes. It is characterized by including the process to arrange.

  A display device and a display driving method thereof according to the present invention include a two-dimensional array of pixel cells in which charged fine particles (charged particles) are sealed in a space formed by a pair of opposing substrates and a partition formed between the substrates. Each pixel cell by forming an electric field between a pair of electrodes provided in each pixel cell, and moving and adhering charged particles in one of the electrode directions according to the polarity of the electric field. In a toner-type reflective display device (display device) that displays the desired image information by controlling the reflection state of external light incident on the pixel cell, each pixel cell is disposed at least on the visual field side and the back surface side, respectively. Of the transparent first substrate (upper substrate) and second substrate (lower substrate), a first electrode (lower electrode, main electrode) is provided on the second substrate, and the first electrode A second electrode paired with the first electrode The first electrode is configured to have an area smaller than the pole, and is provided on the first substrate or on the second substrate so as to be electrically separated from the first electrode. Is set to have an arbitrary color (for example, any one of three colors of cyan, yellow, and magenta capable of color expression by subtractive color mixing) for each pixel cell.

  Thereby, when an electric field is formed by applying a voltage between the electrodes, the charged particles move to and adhere to the electrode side having the opposite polarity. When the charged particles adhere to the first electrode side, the charged particles are dispersed and attached to the second substrate side in the pixel cell, and the charged particles pass through the transparent first substrate. The color of the charged particles is visually recognized, and color display can be realized.

  Further, by providing at least a white thin film layer (white thin film) on the first electrode, when the charged particles adhere to the second electrode side, the second electrode is more effective than the first electrode. Since it has a small area, the charged particles are hardly recognized from the visual field side. Instead, the white color of the white thin film provided on the first electrode is visually recognized and white display is realized. The

  Therefore, for example, one display pixel of a display panel is configured by combining three (three color) pixel cells each encapsulating the above three colored particles of cyan, yellow, and magenta, and the display color in each pixel cell. By controlling (color display and white display state), arbitrary color display (color display) can be realized based on subtractive color mixture.

Here, in the configuration in which the second electrode is provided on the first substrate, the first electrode and the second electrode can be disposed sufficiently apart from each other, and the display color in each pixel cell can be set. The area of the first electrode that is deeply involved can be set relatively large, and the direction of the electric field (the moving direction of the charged particles) can be set between the opposing substrates (that is, in the direction perpendicular to the substrate). Therefore, the charged particles can be favorably moved according to the electric field, and the display color can be expressed more clearly.
In the configuration in which the second electrode is provided on the second substrate together with the first electrode, the first electrode and the second electrode can be manufactured by applying the same manufacturing process, Since there is no need to provide an electrode on the first substrate, the display panel can be made thinner.

  Further, in the display device according to the present invention, black charged particles are used as charged particles sealed in each pixel cell constituting the display panel, in addition to the three colors of cyan, yellow, and magenta used for the subtractive color mixture. An encapsulated pixel cell may be provided to constitute one display pixel with four colors. According to this, in each pixel cell, a display color can be arbitrarily set by appropriately setting a white display state by a white thin film, a color display state by a single or mixed color of cyan, yellow, and magenta, and a true black display state by black. And a color display having vivid color development and contrast can be realized.

  Further, in the display device according to the present invention, instead of the configuration in which each pixel cell constituting the display panel is provided with a white thin film, the charged particles having the above three colors or four colors are mixed with white charged particles in the same pixel cell. You may make it enclose in. According to this, when an electric field is formed so that white charged particles adhere to the first electrode side, the color of the charged particles is visually recognized through the transparent first substrate, and white display is performed. Realized.

In the display device manufacturing method according to the present invention, in the display panel (pixel cell) having the above-described configuration, after the step of encapsulating the charged particles in the pixel cell, the charged particle is directly or indirectly applied. A step of applying ultrasonic vibration is executed.
According to this, charged particles adsorbed to each other at the time of encapsulation in the pixel cell can be dispersed and uniformly arranged on the surface of each electrode, so that the charged particles can be moved quickly and appropriately according to the electric field. In addition, the color of the charged particles adhering to the first electrode, which is deeply related to the setting of the display color in each pixel cell, can be seen well, the response time is fast, and good display quality can be obtained. A color display device can be realized by a relatively simple manufacturing method.

Hereinafter, a display device and a display driving method thereof according to the present invention will be described in detail with reference to embodiments.
<First Embodiment>
FIG. 1 is a schematic configuration diagram showing a first embodiment of a display device (display panel) according to the present invention.

  The display device according to the present embodiment includes a display panel 10A in which a plurality of display pixels are arranged two-dimensionally in an arbitrary arrangement form such as a matrix arrangement or a delta arrangement, and the plurality of display pixels include: For example, as shown in FIGS. 1A and 1B, the display pixels are arranged between an upper substrate (first substrate) 11 and a lower substrate (second substrate) 12 that are arranged to face each other. A plurality of pixel cells PEC having spaces SC (cell structures) separated from each other are provided by partition walls (corresponding to lattice-like partition walls in the figure) 13 provided according to the above.

  As shown in FIG. 1B, each pixel cell PEC is formed on the lower substrate 12, as shown in FIG. 1A, in a region corresponding to the planar extension of each pixel cell PEC (for example, pixel cell). A lower electrode (first electrode) 15a formed in a region having a spread equivalent to the planar shape of the PEC), and a white thin film layer formed on the surface of the lower substrate 12 so as to cover the lower electrode 15a ( A region (for example, a pixel cell PEC as shown in FIG. 1A) that avoids a planar overlap with the lower electrode 15a as much as possible on the upper substrate 11 (on the opposite side of the visual field; below the drawing) on the upper substrate 11. A region extending in the vicinity of the partition wall 13 and having an area smaller than that of the lower electrode 15a, or a region in the vicinity of the corner formed by the two partition walls 13 as shown in FIG. Formed on the upper electrode (second electric ) 14a, a protective film 16 formed on the surface of the upper substrate 11 so as to cover the upper electrode 14a, and the space SC of each pixel cell PEC formed by the upper substrate 11, the lower substrate 12, and the partition wall 13 And a charged particle group (group) PLc, PLy, PLm (chargeable fine particles; hereinafter collectively referred to as “charged particle PLx”) having a specific color component. doing.

  Here, the upper substrate 11 is configured using a transparent substrate material, and the protective film 16 is also configured using a transparent thin film material. The white thin film 17 formed on the lower electrode 15a is a metal oxide film having a high reflectance such as titanium oxide and having a white color. That is, it is configured such that the inside of the pixel cell PEC (particularly, the white thin film 17 on the lower substrate 12 side) can be satisfactorily seen through the upper substrate 11 and the protective film 16 from the view side (upper side of the drawing).

Further, the charged particles PLc, PLy, and PLm sealed in each pixel cell PEC are cyan (indigo system: blue system color), yellow (yellow system: yellow system color), and magenta (red system: red system color), respectively. The pixel cells PEC that are fine particles having three primary colors and in which the charged particles PLc, PLy, and PLm of the three colors are encapsulated are set, for example, so that different colors are adjacent to each other. . That is, one display pixel for performing color display is configured with a set of three pixel cells PEC in which charged particles PLc, PLy, and PLm of cyan, yellow, and magenta are encapsulated.
Further, the protective film 16 and the white thin film 17 formed so as to cover the upper electrode 14a and the lower electrode 15a provided for each pixel cell PEC are directly charged to the upper electrode 14a and the lower electrode 15a with charged particles PLx (PLc, PLy). , PLm) can be prevented from adhering to suppress deterioration of the electrode material, deterioration of the movement characteristics of the charged particles PLx, and the like.

  Although not shown, the upper electrode 14a and the lower electrode 15a are connected to a driver circuit provided outside the display panel 10A via individual signal lines (wiring layers) and displayed on the display panel 10A. In accordance with display data (color gradation signal) based on image information, an electric field having a predetermined polarity is applied to each of the pixel cells PEC constituting each display pixel. Accordingly, the charged particles PLx are converted into the upper electrode 14a according to the charging polarity of the charged particles PLx sealed in each pixel cell PEC and the polarity of the electric field applied between the upper electrode 14a and the lower electrode 15a of the pixel cell PEC. Or it moves so that it may be adsorbed by either of the lower electrodes 15a.

Next, a display driving operation (pixel cell driving method) of the display device having the above-described structure will be described with reference to the drawings.
FIG. 2 is a conceptual diagram illustrating a driving state of a pixel cell applied to the display device according to the present embodiment. FIG. 3 is a diagram for explaining display colors in the display device (display pixel) according to the present embodiment. It is a figure which shows subtractive color mixing. Here, for convenience of explanation, the case where the charged particles enclosed in each pixel cell are charged with positive (+) polarity for convenience, but when charged with negative (−) polarity, The display state opposite to the following explanation is shown.

  In the display panel 10A having the above-described configuration, as shown in FIG. 2A, a negative (-) voltage is applied to the upper electrode 14a from a driver circuit (not shown), and the lower electrode 15a is applied. When a positive (+) voltage is applied, the charged particles PLx (PLc, PLy, PLm) charged in the positive polarity are moved in the direction of the upper electrode 14a by the electric field generated in the pixel cell PEC, and the surface of the electrode 14 is moved. It adheres to (the surface of the protective film 16). As a result, the charged particles PLx adhere to the surface of the upper electrode 14a having a sufficiently small area compared to the planar extent of the pixel cell PEC (downward in the drawing) and become a blind spot from the field of view (not visible). From the view side, the white thin film 17 formed on the lower substrate 12 of the pixel cell PEC is visually recognized through the upper substrate 11 and the protective film 16, and the pixel cell PEC shows a white display state ( White display operation).

  On the other hand, as shown in FIG. 2B, when a positive (+) voltage is applied from the driver circuit to the upper electrode 14a and a negative (−) voltage is applied to the lower electrode 15a, the pixel cell PEC is applied. Due to the electric field generated inside, the charged particles PLx move toward the lower electrode 15a and adhere to the surface of the electrode 15 (the surface of the white thin film 17). As a result, the charged particles PLx adhere to the lower electrode 15a (upward in the drawing) having a sufficiently large area corresponding to the planar expansion of the pixel cell PEC, so that the upper substrate 11 and the protective film 16 are interposed from the view side. Thus, the charged particles PLx adhering on the white thin film 17 of the pixel cell PEC are visually recognized, and the pixel cell PEC displays the color (cyan, yellow, magenta) of the charged particle PLx (color display state) ) (Color display operation).

  By appropriately setting the white display and the color display state in each pixel cell as described above, the display color in each display pixel composed of a set of three colors (pixel cells) can be arbitrarily set. Here, as described above, in the display device according to the present embodiment, the color of the white thin film 17 in each pixel cell PEC constituting the display pixel or the charged particles PLx adhering to the upper surface of the white thin film 17 is directly set. Since it has a configuration for visual recognition (specifically, a reflective display configuration in which a color is recognized by visually recognizing reflected light incident on the pixel cell PEC from the outside), a known subtractive color mixture is used. As shown in FIG. 3, all display colors are realized by superimposing the colors of the pixel cells based on them (mixing of three colors) and the mixing ratio thereof. In FIG. 3, C is cyan, Y is yellow, M is magenta, CY is a dark green color that is a mixed color of cyan and yellow, YM is an orange color that is a mixed color of yellow and magenta, and CM is A deep purple color which is a mixed color of cyan and magenta, and BK is black which is a mixed color of cyan, yellow and magenta.

  Therefore, according to the display device and the display driving method thereof according to the present embodiment, any one of charged particles having a specific color is selected depending on the voltage applied to the upper electrode and the lower electrode of each pixel cell constituting the display pixel. By adsorbing to the electrode side, the display color to be set (white color of white thin film, or CYM single color or mixed color of charged particles) can be directly viewed through the transparent upper substrate. Each display color (especially white) can be recognized brightly and a color display device with high reflectivity can be realized compared to a configuration in which display pixels (pixel cells) are visually recognized through a color filter. it can. In addition, according to the verification performed by the present inventor, it was found that the display device according to the present embodiment can be expected to have a very high reflectance of 50% or more in the white display state.

Further, since color display can be realized without using a color filter, the display device (display panel) can be further reduced in thickness.
Furthermore, since the moving speed (display response time) of charged particles can be increased compared to the electrophoretic display device shown in the prior art, an electronic paper that can rewrite image display quickly is realized. be able to.

<Second Embodiment>
Next, a second embodiment of the display device according to the present invention will be described.
FIG. 4 is a schematic configuration diagram showing a second embodiment of a display device (display panel) according to the present invention. Here, about the structure equivalent to 1st Embodiment mentioned above, the same or same code | symbol is attached | subjected, and the description is simplified or abbreviate | omitted.

  In the first embodiment described above, the upper electrode 14a having a small area is provided on the upper substrate 11 side of each pixel cell PEC constituting the display panel 10A (display pixel), and the lower electrode 15a having a large area is provided on the lower substrate 12 side. In this configuration, the polarity of the electric field is controlled for each pixel cell PEC, and the charged particles PLx are adsorbed to any one of the electrodes to perform white display, CYM single color display, or a mixed color display thereof. However, the present embodiment has a configuration in which a pair of electrodes having different areas are provided on the lower substrate.

  As shown in FIGS. 4A and 4B, the display panel 10 </ b> B (display pixel) applied to the display device according to the present embodiment has an upper portion disposed opposite to the display panel 10 </ b> B as in the first embodiment. A pixel cell PEC having a space SC isolated from each other is provided by a partition wall 13 provided between the substrate 11 and the lower substrate 12. In particular, the pixel cell PEC is disposed on the lower substrate 12 in the plane of each pixel cell PEC. The main electrode 15b formed in a region occupying most of the general spread (for example, a region having a spread equivalent to the planar shape of the pixel cell PEC) is electrically separated from the main electrode 15b on the lower substrate 12. A region that occupies a small part of the planar spread of each pixel cell PEC (for example, as shown in FIG. 4A, a region extending in the vicinity of the partition wall 13 of the pixel cell PEC and from the main electrode 15b). Also has a small area 4B or a sub-electrode 14b formed in the vicinity of the corner formed by the two partition walls 13 as shown in FIG. 4C, and a lower portion so as to cover the main electrode 15b and the sub-electrode 14b. A configuration including a white thin film 17 formed on the substrate 12 and charged particles PLx (PLc, PLy, PLm) having specific color components sealed in the space SC of each pixel cell PEC. ing. Reference numeral 18 denotes a protective film provided on the surface of the upper substrate 11, but may be omitted.

Next, a display driving operation (pixel cell driving method) of the display device having the above-described structure will be described with reference to the drawings.
FIG. 5 is a conceptual diagram showing a driving state of a pixel cell applied to the display device according to the present embodiment. Here, as in the above-described embodiment, a case will be described in which charged particles enclosed in each pixel cell are charged with positive (+) polarity for convenience.

  In the display panel 10B having the above-described configuration, as shown in FIG. 5A, a negative (−) voltage is applied to the sub-electrode 14b, and a positive (+) voltage is applied to the main electrode 15b. Is applied, the charged particles PLx positively charged by the electric field generated in the pixel cell PEC adhere to the surface of the sub electrode 14b (the surface of the white thin film 17). As a result, the charged particles PLx adhere to the sub-electrode 14b having a sufficiently small area as compared with the planar extension of the pixel cell PEC, so that the pixel cell passes through the upper substrate 11 and the protective film 18 from the view side. The white thin film 17 formed on the PEC main electrode 15b is visually recognized, and the pixel cell PEC exhibits a white display state.

  Here, when the display color for each pixel cell PEC is examined, in the white display state, the charged particles PLx are concentrated and attached to a part of the pixel cell PEC (region where the sub electrode 14b is formed). For this reason, the color of the charged particles PLx is visually recognized from the visual field side. However, since human vision has a characteristic of capturing white as an expanded color, most regions of the pixel cell PEC (formation of the main electrode 15b). Due to the white region (white thin film 17) exposed in the region), a very small color region (each color of CYM adhering to the surface of the sub electrode 14b) is hardly visually recognized and is well recognized as a white display state. This is because, for example, when a small portion of white paper colored black is observed from a distance, the black colored region is hardly recognized, and the overall color depends on the ground color (white) that occupies most of the paper. It is easily estimated from the fact that it is visually recognized as white paper.

On the other hand, when a positive (+) voltage is applied to the sub-electrode 14b and a negative (-) voltage is applied to the main electrode 15b, as shown in FIG. Due to the generated electric field, the charged particles PLx adhere to the surface of the main electrode 15b (the surface of the white thin film 17). As a result, the charged particles PLx adhere to the main electrode 15b having a sufficiently large area corresponding to the planar expansion of the pixel cell PEC, so that the pixel cell PEC passes through the upper substrate 11 and the protective film 18 from the view side. The charged particles PLx adhering to the main electrode 15b (white thin film 17) are visually recognized, and the pixel cell PEC shows a color display state corresponding to the color of the charged particles PLx.
Then, by appropriately setting the white display and color display state in each pixel cell PEC, the display color in each display pixel composed of a set of three colors (pixel cells) is changed to the subtractive color mixture shown in FIG. Can be arbitrarily set based on the above.

  Therefore, according to the display device and the display driving method thereof according to the present embodiment, the voltage applied to the main electrode 15b and the sub electrode 14b of each pixel cell constituting the display pixel, as in the first embodiment described above. Correspondingly, the display color (white color of white thin film or CYM single color or mixed color of charged particles) set by adsorbing charged particles having a specific color on either electrode side is passed through the transparent upper substrate. Since it can be directly visually recognized, each display color can be recognized brighter and display characteristics are superior compared to a configuration in which a display pixel (pixel cell) is visually recognized through a color filter as shown in the prior art. A color display device can be realized.

  Further, it is not necessary to form a color filter or an electrode layer on the upper substrate side, and color display can be realized with a simple panel structure in which a pair of electrode layers is formed on the lower substrate. Therefore, a display device (display panel) Can be further reduced in thickness. Therefore, by configuring the substrate with a flexible thin film material, a flexible display panel can be realized, and convenience as electronic paper and a degree of freedom in handling can be increased.

<Third Embodiment>
Next, a third embodiment of the display device according to the present invention will be described.
FIG. 6 is a schematic configuration diagram showing a third embodiment of a display device (display panel) according to the present invention. Here, about the structure equivalent to 1st and 2nd embodiment mentioned above, the same or same code | symbol is attached | subjected, and the description is simplified or abbreviate | omitted.

  In the first and second embodiments described above, fine particles having each color of CYM are applied as the charged particles PLx sealed in the pixel cells PEC constituting the display panels (display pixels) 10A and 10B. Although a configuration in which various colors are realized by subtractive color mixing has been shown, in the present embodiment, in addition to the above three colors of CYM, a configuration including a pixel cell in which charged particles having black color are enclosed is provided. .

  As shown in FIG. 6A, a first example of a display panel 10C (display pixel) applied to the display device according to the present embodiment is between an upper substrate 11 and a lower substrate 12 arranged to face each other. The provided partition walls 13 provide pixel cells PEC having spaces SC that are isolated from each other, and in particular, charged particles PLc having the above-described three colors of cyan (C), yellow (Y), and magenta (M), In addition to the pixel cell PEC in which PLy and PLm are encapsulated, a pixel cell PEC in which charged particle (group) PLk having black (K) is encapsulated is provided. Here, as in the first embodiment, each pixel cell PEC has a configuration in which an upper electrode 14a having a small area is provided on the upper substrate 11 side and a lower electrode 15a having a large area is provided on the lower substrate 12 side. Have.

As shown in FIG. 6B, the second example of the display panel 10D (display pixel) applied to the display device according to the present embodiment is the above-described cyan (C), yellow (Y), magenta. In addition to the pixel cell PEC in which charged particles PLc, PLy, and PLm having three colors (M) are encapsulated, the pixel cell PEC in which charged particles PLk having black (K) are encapsulated is provided, Further, as in the second embodiment, each pixel cell PEC is provided with a sub-electrode 14b and a main electrode 15b having different areas only on the lower substrate 12 side, and a white thin film 17 covering the electrodes 14 and 15. It has a configuration.
That is, in this embodiment, each display pixel is configured by a set of four colors (pixel cells) composed of CYM and K, and a white display state by the white thin film 17 in each pixel cell PEC of the display pixel, a single color of CYM or By appropriately setting the color display state by the mixed color and the true black display state by the K single color, the display color can be arbitrarily set.

According to the display device having such a configuration, in addition to the respective colors (including black; color display state) realized by the subtractive color mixing shown in FIG. 3, the pixel cell PEC in which charged particles PLk having black are enclosed. Instead of black mixed with other colors, it is possible to realize “black black” (true black color; true black display state).
That is, in the above-described subtractive color mixture, when realizing a CYM mixed color, it is necessary to finely control the purity of each color of CYM in order to generate a desired display color. Even so, there is a possibility that a color shift peculiar to mixed colors such as reddish black or yellowish black occurs.

  Therefore, in the present embodiment, black (K) is added to the pixel cell PEC in which charged particles PLc, PLy, and PLm having three colors of cyan (C), yellow (Y), and magenta (M) are encapsulated. By providing the pixel cell PEC in which the charged particles PLk are encapsulated, it is possible to display vivid black (true black), which is difficult to express with mixed colors, and realize color display with vivid color and contrast. can do.

<Fourth Embodiment>
Next, a fourth embodiment of the display device according to the present invention will be described.
FIG. 7 is a schematic configuration diagram showing a fourth embodiment of a display device (display panel) according to the present invention. Here, about the structure equivalent to the 1st thru | or 3rd embodiment mentioned above, the same or same code | symbol is attached | subjected, and the description is simplified or abbreviate | omitted.

  In the first to third embodiments described above, the white thin film 17 is provided on the lower substrate 12 side of each pixel cell PEC constituting the display panels (display pixels) 10A to 10D to control the electric field in the pixel cell PEC. In this embodiment, the charged particles PLx are moved and adhered to realize the white display state and the color display state (including the black display state and the true black display state). In the present embodiment, CYM is provided in the pixel cell. Furthermore, it has a configuration in which charged particles having white are encapsulated together with charged particles having each color of (K).

  As shown in FIG. 7A, a display panel 10E (display pixel) applied to the display device according to the present embodiment includes a partition wall 13 provided between an upper substrate 11 and a lower substrate 12 arranged to face each other. Thus, a pixel cell PEC having a space SC isolated from each other is provided, and the pixel cell PEC has a charge having any one of the above-described three colors of cyan (C), yellow (Y), and magenta (M). Along with the particles PLc, PLy, and PLm, a charged particle PLw having a white color is enclosed.

  Here, as shown in FIG. 7A, each pixel cell PEC is provided with an upper electrode 14a having a small area on the upper substrate 11 side and an area on the lower substrate 12 side, as in the first embodiment. The lower substrate 15a having a large size may be provided, or, like the display panel 10F shown in FIG. 7B, the lower substrate 12 side as in the second embodiment. It may have a configuration in which only the sub electrode 14b and the main electrode 15b having different areas are provided. Further, on the surface of the lower substrate 12 of each pixel cell PEC, a protective film for suppressing deterioration of the electrode material due to adhesion of the charged particles PLx to the sub-electrode 14b and the main electrode 15b, deterioration of the movement characteristics of the charged particles PLx, and the like. 19 is provided.

Next, a display driving operation (pixel cell driving method) of the display device having the above-described structure will be described with reference to the drawings.
FIG. 8 is a conceptual diagram showing a driving state of a pixel cell applied to the display device according to the present embodiment. Here, for convenience, charged particles having any of CYM charged in each pixel cell are charged to positive (+) polarity (second charge polarity), and charged particles having white are negative (− ) A case of charging with polarity (first charge polarity) will be described.

  In the display panel 10E having the above-described configuration, as shown in FIG. 8A, a negative (−) voltage is applied to the upper electrode 14a, and a positive (+) voltage is applied to the lower electrode 15a. Is applied, the charged particles PLx, PLy, PLm charged in a positive polarity move in the direction of the upper electrode 14a due to the electric field generated in the pixel cell PEC and adhere to the surface of the electrode 14 (the surface of the protective film 16). The negatively charged charged particles PLw move in the direction of the lower electrode 15a and adhere to the surface of the electrode 15 (the surface of the protective film 19).

  As a result, the charged particles PLx, PLy, and PLm having any color of CYM are attached to the surface of the upper electrode 14a (lower side of the drawing) having a sufficiently small area compared to the planar extension of the pixel cell PEC. On the other hand, the charged particles PLw having white color adhere to the lower electrode 15a (upper side of the drawing) having a sufficiently large area corresponding to the planar spread of the pixel cell PEC. The white charged particles PLw attached on the lower substrate 12 of the pixel cell PEC are visually recognized through the upper substrate 11, and the pixel cell PEC shows a white display state.

  On the other hand, as shown in FIG. 8B, when a positive (+) voltage is applied to the upper electrode 14a and a negative (−) voltage is applied to the lower electrode 15a, it is generated in the pixel cell PEC. Due to the applied electric field, the charged particles PLx, PLy, PLm charged to the positive polarity move in the direction of the lower electrode 15a and adhere to the surface of the electrode 15 (the surface of the protective film 19), and the charged particles PLw charged to the negative polarity Then, it moves in the direction of the upper electrode 14a and is adsorbed on the surface of the electrode 14 (the surface of the protective film 16).

As a result, the charged particles PLx, PLy, and PLm having any color of CYM adhere to the lower electrode 15a (upward in the drawing) having a sufficiently large area corresponding to the planar expansion of the pixel cell PEC. The white charged particles PLw adhere to the surface of the upper electrode 14a (lower in the drawing) having a sufficiently small area as compared with the planar extension of the pixel cell PEC and become a blind spot from the view side. The charged particles PLx, PLy, and PLm having any color of CYM adhering on the lower substrate 12 of the pixel cell PEC are visually recognized through the upper substrate 11, and the pixel cell PEC is charged with charged particles. A state (color display state) in which colors (cyan, yellow, magenta) of PLx, PLy, and PLm are displayed is shown.
Then, by appropriately setting the white display and color display state in each pixel cell, the display color in each display pixel composed of a set of three colors (pixel cells) can be arbitrarily set based on the subtractive color mixture. Can be set.

  Therefore, according to the display device and the display driving method thereof according to the present embodiment, as in the above-described embodiments, the voltage applied between a pair of electrodes having different areas provided in each pixel cell constituting the display pixel. Accordingly, a specific color (white, or a single color or mixed color of CYM) is obtained by adsorbing charged particles having any color of CYM and charged particles having white color on either electrode side. Since it can be arbitrarily set and can be directly viewed through the transparent upper substrate, compared with a configuration in which the display pixel (pixel cell) is visually recognized through the color filter as shown in the prior art, Each display color can be recognized brightly, and a color display device having excellent display characteristics can be realized.

  In the present embodiment, a set of three colors of display pixels is described which includes pixel cells in which charged particles having a color of CYM and charged particles having white are encapsulated. However, the present invention is not limited to this. Instead, as shown in the third embodiment, a pixel cell in which charged particles having black color and charged particles having white color are encapsulated is further added to form a display pixel with a set of four colors. May be. According to this, in addition to each color (including black; color display state) realized by subtractive color mixture of CYM, “blackish black” (true black; true black display) by pixel cells in which charged particles having black are enclosed. State) can be realized, and color display having vivid color and contrast can be realized.

Next, the charged particles applicable to the display device (display panel) shown in each of the above-described embodiments and the arrangement method thereof will be briefly described.
The charged particles applicable to the display device shown in each of the embodiments described above are, for example, fine particles equivalent to known color toners used in color fax communication machines, color copiers, color laser printers, and the like, and their manufacture. The method can be applied, but it must have the following characteristics.

  That is, in a generally applied color toner, since toner particles need to be fixedly attached (bound) to an adherend such as paper, a colorant such as an organic pigment is added to the binder resin as its particle structure. In the present invention, the fine particles (charged particles) need to move quickly and accurately between a pair of electrodes in accordance with the electric field formed in the pixel cell as described above. Therefore, only the electrostatic force based on the electric field strength formed by the applied voltage for each electrode, or in addition to the electrostatic force, it adheres to the electrode surface with a relatively weak binding force that can be detached from the electrode. It is desirable to apply fine particles having such characteristics.

  Therefore, as the charged particles applicable to the present invention, in addition to the color toner composed of the above-described colored fine particles, those having fine particles themselves having a specific color can be applied as they are. For example, as the fine particles having black as shown in each of the embodiments described above, for example, carbon or graphite-based granular particles can be favorably applied, and as the fine particles having white, the white thin film can be applied. In addition, the applied titanium oxide-based granular particles can be satisfactorily applied. Further, as fine particles having cyan (C), yellow (Y), and magenta (M), which are the characteristics of the present invention, fine particles having colors similar to these can be naturally applied, for example, titanium oxide. It is also possible to apply fine particles colored with an organic pigment or the like to fine particles having white color.

Next, a method of arranging the charged particles when the charged particles as described above are sealed in the space of each pixel cell will be briefly described with reference to the drawings.
FIG. 9 is a conceptual diagram showing a process for equalizing the arrangement state of charged particles sealed in pixel cells applied to the display device according to the present invention, and FIG. 10 is applied to the display device according to the present invention. It is the schematic which shows the specific example of the process which equalizes the arrangement | sequence state of the charged particle enclosed with the pixel cell. Here, for the sake of convenience, a case will be described in which the display panel shown in the first and fourth embodiments is subjected to a uniformizing process, but the same processing is also performed in the display panels shown in the second and third embodiments. Is given.

  In the display device having the above-described configuration, when charged particles PLx made of fine particles are sealed in a space SC (inside the pixel cell PEC) formed by the pair of substrates 11 and 12 and the partition wall 13, FIG. As shown in (c), the charged particles may be adsorbed (aggregated) and not uniformly arranged on the surfaces of the electrodes 14 and 15. For this reason, when the display driving operation is performed in a state where the adsorption of the charged particles PLx occurs, the charged particles PLx do not move quickly and appropriately in accordance with the electric field formed in the pixel cell PEC, and display characteristics are displayed. (Response time and display quality) may be deteriorated. Such a phenomenon is shown not only in the case where charged particles PLx and PLw having different polarities are enclosed in a single pixel cell PEC as shown in FIG. 9A, but also in FIG. 9C. As described above, it has been proved by the inventor of the present application that it occurs even when charged particles PLx having a single polarity are encapsulated.

  Therefore, in the method for manufacturing a display device according to the present invention, after the process of encapsulating the charged particles PLx and PLw in the pixel cell PEC, the process of applying ultrasonic vibration to the charged particles PLx and PLw is executed. As a result, as shown in FIGS. 9B and 9D, the charged particles PLx and PLw adsorbed to each other are dispersed and uniformly arranged on the surfaces of the electrodes 14 and 15. Here, simultaneously with the process of applying ultrasonic vibration to the charged particles PLx and PLw, a predetermined voltage may be applied between the electrodes 14 and 15 provided in each pixel cell PEC to form an electric field.

  As a specific configuration for applying ultrasonic vibration to the charged particles, for example, as shown in FIG. 10A, on one side of a pair of substrates (lower substrate 12 in the figure) constituting the display panel, As shown in FIG. 10B, the ultrasonic generator (ultrasonic transducer) 300 is brought into close contact with the ultrasonic generator, and the display panel in which the pixel cells PEC are arranged as shown in FIG. A method of immersing in the liquid LQD in the treatment liquid tank 310 including the ultrasonic transducer 300 and applying ultrasonic vibration through the liquid LQD can be applied.

  Accordingly, the charged particles encapsulated in the pixel cell can be dispersed and uniformly arranged on the electrode surface by a simple manufacturing method, so that the electric field (that is, display data) formed in the pixel cell can be reduced. Accordingly, the charged particles can be moved quickly and appropriately, and the color of the charged particles adhering to the lower substrate 12 (lower electrode 15a) can be visually recognized through the upper substrate 11, and the response time can be improved. A color display device can be realized that is fast and can provide good display quality.

1 is a schematic configuration diagram showing a first embodiment of a display device (display panel) according to the present invention. It is a conceptual diagram which shows the drive state of the pixel cell applied to the display apparatus which concerns on this embodiment. It is a figure which shows the subtraction color mixture for demonstrating the display color in the display apparatus (display pixel) which concerns on this embodiment. It is a schematic block diagram which shows 2nd Embodiment of the display apparatus (display panel) which concerns on this invention. It is a conceptual diagram which shows the drive state of the pixel cell applied to the display apparatus which concerns on this embodiment. It is a schematic block diagram which shows 3rd Embodiment of the display apparatus (display panel) which concerns on this invention. It is a schematic block diagram which shows 4th Embodiment of the display apparatus (display panel) which concerns on this invention. It is a conceptual diagram which shows the drive state of the pixel cell applied to the display apparatus which concerns on this embodiment. It is a conceptual diagram which shows the process which equalizes the arrangement state of the charged particle enclosed with the pixel cell applied to the display apparatus which concerns on this invention. It is the schematic which shows the specific example of the process which equalizes the array state of the charged particle enclosed with the pixel cell applied to the display apparatus which concerns on this invention. It is a schematic block diagram which shows an example of the display device to which the electrophoresis system in a prior art is applied. It is a schematic block diagram which shows an example of the display device to which the toner system in a prior art is applied. It is the schematic which shows the structure which provided the color filter in the display device of the toner system in a prior art.

Explanation of symbols

10A to 10F Display panel 11 Upper substrate 12 Lower substrate 14a Upper electrode 15a Lower electrode 14b Subelectrode 15b Main electrode 17 White thin film PEC Pixel cell PLc, PLy, PLm, PLk, PLw Charged particle

Claims (14)

A pair of electrodes provided in each pixel cell is provided with a display panel in which pixel cells in which charged fine particles are sealed are two-dimensionally arranged in a space formed by a pair of opposing substrates and a partition formed between the substrates. A display device that forms an electric field between them, moves the fine particles to one of the pair of electrodes and either one of the pair of electrodes according to the polarity of the electric field, sets a desired display state, and displays image information In
The pair of substrates is arranged on the visual field side, and includes a first substrate formed of a transparent substrate material and a second substrate arranged on the back side,
The pair of electrodes has a first electrode provided on the second substrate and an area smaller than that of the first electrode, and any of the first substrate and the second substrate A second electrode provided on one of the substrates,
The display device, wherein the fine particles have an arbitrary color for each pixel cell. The display device according to claim 1, wherein the second electrode is provided on the first substrate. The display device according to claim 1, wherein the second electrode is provided on the second substrate so as to be electrically separated from the first electrode. Each pixel cell has a white thin film provided on the second substrate so as to cover at least the first electrode;
The display device according to claim 1, wherein the fine particles have a color other than white. Each of the pixel cells individually encloses the fine particles having any one of the three colors of red, blue, and yellow, and sets the three colors as a set of the display panel. The display device according to claim 4, comprising one display pixel. Each of the pixel cells individually encloses the fine particles having any one of four colors of red, blue, yellow, and black, and displays the four colors as a set. The display device according to claim 4, comprising one display pixel of the panel. Each pixel cell includes white fine particles having a first charge polarity and fine particles having a second charge polarity opposite to the first charge polarity and having a color other than white. The display device according to claim 1, wherein the display device is a display device. Each of the pixel cells includes the white fine particles and the fine particles having any one of three colors of red, blue, and yellow. The display device according to claim 7, wherein one display pixel of the display panel is configured as a set. In the pixel cell, the white fine particles and the fine particles having any one of four colors of red, blue, yellow and black are individually encapsulated, and the 4 The display device according to claim 7, wherein one display pixel of the display panel is configured with a system color as a set. A display driving method for a display device having a display panel in which pixel cells in which chargeable fine particles are sealed are two-dimensionally arranged in a space formed by a pair of substrates arranged opposite to each other and a partition provided between the substrates Because
The pair of substrates is arranged on the visual field side, and includes a first substrate formed of a transparent substrate material and a second substrate arranged on the back side,
The pixel cell has a first electrode provided on the second substrate and an area smaller than that of the first electrode, and the pixel cell is one of the first substrate and the second substrate. A configuration in which a second electrode provided on one substrate and a white thin film provided to cover at least the first electrode are provided, and fine particles having a color other than white are enclosed. Have
By applying a voltage between the first electrode and the second electrode to form a first electric field, the fine particles are moved and attached to the second electrode side, and the second substrate is formed. A white display operation for making the white thin film on the side visible from the view side through the first substrate;
By applying a voltage between the first electrode and the second electrode to form a second electric field, the fine particles are moved to the first electrode side to adhere to the white thin film, A color display operation for making the fine particles attached to the surface of the white thin film on the second substrate side visible from the view side through the first substrate;
A display driving method for a display device, comprising: A display driving method for a display device having a display panel in which pixel cells in which chargeable fine particles are sealed are two-dimensionally arranged in a space formed by a pair of substrates arranged opposite to each other and a partition provided between the substrates Because
The pair of substrates is arranged on the visual field side, and includes a first substrate formed of a transparent substrate material and a second substrate arranged on the back side,
The pixel cell has a first electrode provided on the second substrate and an area smaller than that of the first electrode, and the pixel cell is one of the first substrate and the second substrate. A second electrode provided on one substrate, and white fine particles having a first charge polarity, and fine particles having a second charge polarity and having a color other than white. Having an enclosed configuration,
By applying a voltage between the first electrode and the second electrode to form a first electric field, the white fine particles are moved and attached to the first electrode side, and the other than white The fine particles having color are moved and attached to the second electrode side, and the white fine particles attached to the surface of the first electrode on the second substrate are viewed from the view side through the first substrate. A white display operation to make it visible,
By applying a voltage between the first electrode and the second electrode to form a second electric field, the fine particles having a color other than white are moved and adhered to the first electrode side, The white fine particles are moved and attached to the second electrode side, and the fine particles having a color other than white attached to the surface of the first electrode on the second substrate are passed through the first substrate. Color display operation that is visible from the view side,
A display driving method for a display device, comprising: The fine particles having a color other than white have any one of the three colors of red, blue and yellow.
Each of the pixel cells is individually encapsulated with the fine particles having any one of the three colors.
12. The display pixel of the display panel is configured by using the three system colors as a set, and the display color of the display pixel is set by subtractive color mixture of display colors in the pixel cells. Display driving method of the display device. The fine particles having a color other than white each have any one of four colors of red, blue, yellow and black.
Each of the pixel cells is individually encapsulated with the fine particles having any one of the four colors.
12. The display pixel of the display panel is configured by using the four-color color as a set, and the display color of the display pixel is set by subtractive color mixture of display colors in the pixel cells. Display driving method of the display device. A pair of electrodes provided in each pixel cell is provided with a display panel in which pixel cells in which charged fine particles are sealed are two-dimensionally arranged in a space formed by a pair of opposing substrates and a partition formed between the substrates. A display device that forms an electric field between them, moves the fine particles to one of the pair of electrodes and either one of the pair of electrodes according to the polarity of the electric field, sets a desired display state, and displays image information In the manufacturing method of
A display device comprising: a process of encapsulating the fine particles in a space constituting the pixel cell, and at least applying ultrasonic vibration to the fine particles to uniformly arrange the fine particles on the electrode. Production method.

Images