JP2010204261A - Mask for arranging particle and particle arranging method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mask for arranging particles and a particle arranging method using the same, accurately arranging particles in a predetermined cell in utilizing the mask for arranging particles to arrange a particle group as a display medium. <P>SOLUTION: The display medium is arranged in a panel space formed by making two panel substrates opposite to each other. In manufacturing an information display panel displaying information by driving the display medium formed as the particle group including chargeable particles by an electric field formed between the opposite panel substrates, the mask for arranging particles including an opening and a mask part according to the respective display areas is used for arranging different kinds of display media in the respective display areas formed by dividing the whole display area. In the mask, the edge part 11-3 of the mask part 11-2 is made thicker than the other portions of the mask part like a frame, thereby preventing the edge part 11-3 of the mask part from being warped. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display medium arranged in a panel space formed by two panel substrates facing each other, wherein the display medium is configured as a group of particles containing chargeable particles by an electric field formed between the counter panel substrates. When displaying an information display panel that displays information such as images by driving the display, it is used to arrange different types of display media for each display area divided into the entire display area. The present invention relates to a particle arrangement mask having an opening and a mask portion, and a particle arrangement method using the same.

  2. Description of the Related Art Conventionally, at least two types of display media that are configured as a particle group including particles having at least optical reflectivity and chargeability and at least optical reflectivity and charge characteristics are different from each other are different in color and charge polarity. Enclose a combination of different types of display media (particle groups) in one cell, and enclose another combination of two types of display media (particle groups) with different colors and charged polarities in another cell. Then, cells in which combinations of display media (particle groups) different from each other are enclosed are collected as separate cell groups and arranged in display areas (areas) divided into a plurality of display screens to perform area color display. A system information display panel is known (see, for example, Patent Document 1).

  In addition, when producing an information display panel of a type in which a display screen (entire display area) is arranged in each divided display area (area) to perform color display by area, the panel substrate on which the cells are formed A method is also known in which a particle group serving as a display medium is dropped from above and filled in a cell. Further, at that time, it is also known that the particle group is filled by arranging a mask so that the mask portion is on the cell where the color particle group to be filled is not desired to be filled (for example, Patent Documents). 2).

  FIGS. 20A and 20B are diagrams for explaining an example of a particle arrangement method using a conventional mask. In the example shown in FIGS. 20A and 20B, 51 is a display surface side transparent substrate, 52 is a transparent electrode provided on the substrate 51, and 53 is a partition 53 for securing a gap between panel substrates provided on the electrode 52. -1, a partition composed of a cell formation dedicated partition 53-2 provided on the electrode 52, 54 is a first area-specific opening mask composed of an opening 54-1 and a mask portion 54-2, 55 is a second area-specific mask having an opening 55-1 and a mask 55-2, 56 is a black display medium, 56Ba is positively charged black particles, 57 is a red display medium, and 57Ra is positive. Chargeable red particles.

  In the example shown in FIGS. 20A and 20B, first, as shown in FIG. 20A, the black display medium (black particle group) 56 is dropped from above the first area-specific opening mask 54. It fills and arrange | positions in the cell 58 of the board | substrate 51 by a system. In this example, the first area-specific opening mask 54 provided with an opening 54-1 in an area where the black display medium 56 is to be arranged is formed on the substrate 51 with the partition wall 53 (53-1, 53-2). The black particle group 56 is spread on the mask 54 from above. On the other hand, since the area where the black display medium 56 is not desired to be arranged is masked by the mask portion 54-2, the black particle group 56 is not filled in the cell 58 under the mask, and the black display medium 56 is not arranged.

  Next, as shown in FIG. 20B, the red display medium (red particle group) 57 is filled and arranged in the cell 58 of the substrate 51 by dropping from above the second area-specific opening mask 55. To do. In this example, the partition area 53 (53-1, 53-2) formed on the substrate 51 is provided with a second area-specific opening mask 55 provided with an opening 55-1 in an area where the red particle group 57 is to be disposed. The red particle group 57 is distributed over the mask 55 from above. On the other hand, since the area where the red display medium 57 is not desired to be arranged is masked by the mask unit 55-2, the cell 58 under the mask is not filled with the red particle group 57 and the red display medium 57 is not arranged. Then, after filling the whole cell 58 with a third color, for example, a white particle group and arranging it as a white display medium, the substrate with the electrode on the back side is bonded onto the partition wall 53 with an adhesive, whereby white / An information display panel of an area-specific color display system comprising a black display area and a white / red display area has been obtained.

JP 2005-301030 A JP 2005-258240 A

  In conventional color display system information display panels by area, it is necessary to arrange display media (particle groups) of different colors for each area, and use masks with different mask portions and openings for each color of the display medium. Although the particle group as the display medium is arranged, the mask portion of the mask, which is the boundary between the mask portion and the opening portion, does not adhere to the top of the partition wall on the panel substrate on which the mask is placed, and a gap is easily formed. When the particle group is arranged in the cell on the panel substrate formed by being surrounded by the partition wall, this color is also applied to the cell in which it is not desired to arrange the particle group of this color under the mask portion from this gap. There was a problem that a particle group was arranged.

  In particular, the above problem tends to occur when an attempt is made to obtain another color display area in the center of the entire screen or in any of the four corners. If there is the above problem, the cells near the boundary of the different color display area may be insufficiently filled with the necessary color particles, or may be mixed with unnecessary color particles. In some cases, the display image near the boundary of the color display area is blurred and unclear.

  FIGS. 21A, 21B, 22A, and 22B are diagrams for explaining the conventional problems described above.

  The example shown in FIGS. 21A and 21B shows a case where another color display area is located in the lower right corner of the screen. FIG. 21A is formed by the partition 53 by the first mask 54. An example in which the first color particle group (for example, the black particle group 56) is filled and arranged in the formed cell 58 is shown, and FIG. 21B shows a cell 58 formed by the partition wall 53 by the second mask 55. In the example, the second color particle group (for example, the red particle group 57) is filled and arranged. As shown in FIGS. 21A and 21B, the adhesion between the mask portion of the mask near the opening of the mask including the area boundary and the top of the partition wall is poor, and the space between the top of the partition wall and the mask portion is poor. Since the gap is easily formed, the distributed particles may be arranged to wrap around from the gap between the mask portion of the mask and the partition to the cells below the mask portion.

  22A and 22B show a case where another color display area is located in the center of the screen, and FIG. 22A is formed by the partition wall 53 by the first mask 54. An example in which the first color particle group (for example, the black particle group 56) is filled and arranged in the cell 58 is shown, and FIG. 22B shows the inside of the cell 58 formed by the partition wall 53 by the second mask 55. In the example, the second color particle group (for example, the red particle group 57) is filled and arranged. Even in the examples shown in FIGS. 22A and 22B, the adhesion between the mask portion of the mask near the opening of the mask including the area boundary and the top of the partition wall is poor, and the space between the top of the partition wall and the mask portion is poor. Since the gap is easily formed, the distributed particles may be arranged to wrap around from the gap between the mask and the partition to the cells below the mask portion.

  An object of the present invention is to solve the above-described problems and to arrange a particle placement mask capable of accurately placing particles in a predetermined cell when placing a particle group as a display medium using the particle placement mask. It is intended to provide a particle arrangement method using

  The particle arrangement mask according to the present invention is a display medium arranged in a panel space formed by opposing two panel substrates, at least one of which is transparent, to each other, and charged particles by an electric field formed between the opposed panel substrates. When a display medium configured to display information such as an image is driven by driving a display medium configured as a particle group including particles, different types of display media are arranged for each display area obtained by dividing the entire display area. A particle placement mask having an opening and a mask portion adapted to each display region used at the time, wherein the mask portion is made thicker than other portions of the mask portion in a frame shape. It is characterized by the fact that the edge portion is not warped.

  In addition, as a preferred example of the particle arrangement mask of the present invention, the frame portion has a continuous frame-like thick portion for making the edge portion of the mask portion into a frame shape and thicker than other portions of the mask portion. It is either a thick part or an intermittent frame-like thick part, and the edge of the mask part has a frame-like shape to make it thicker than other parts of the mask part. The thick portion is formed of a member different from the mask, and the frame-shaped thick portion is fixed so that the edge portion of the mask portion is thicker than the other portions of the mask portion. The edge portion of the metal mask portion is made of a metal material, and the edge portion of the metal mask portion is made into a frame shape and thicker than the metal mask portion. The thick portion is formed as a member different from at least the mask, and the frame-shaped meat The portion is configured so that the edge of the metal mask portion is not warped by fixing the edge of the metal mask portion so as to be thicker than the other portions of the metal mask portion, A frame-shaped thick portion for making the edge of the mask portion thicker than the other portions of the mask portion is made of a metal member attracted to a magnet, and the edge of the mask portion is framed The mask part is made thicker than the other parts of the mask part so that the edge part of the mask part does not warp, the mask is made of a metal material that can be attracted to the magnet, and the metal mask part A frame-shaped thick portion for thickening the metal mask portion is formed as a member different from at least the mask, and the frame-shaped thick portion is formed of the metal mask portion. The edge of the metal By fixing to be thicker than the other portions of the click portion, the edge portion of the metal mask portion is configured not warped, there is.

  Furthermore, in the particle arrangement method of the present invention, (1) when arranging a particle group as a display medium in a cell surrounded by a partition on a panel substrate, the particle placement mask is placed on the partition, The particle arrangement is performed by dropping the particle group from above the particle arrangement mask, or (2) when arranging the particle group as the display medium in the cell surrounded by the partition on the panel substrate. A mask is placed on the partition wall, and the particle placement mask is brought into close contact with the partition wall by a magnet disposed on the back side of the panel substrate, and the particle group is dropped from above the particle placement mask to place the particle. Or (3) when disposing a particle group as a display medium in a cell surrounded by a partition wall on a panel substrate, placing the particle disposition mask on the partition wall, and at least the particle disposition mask Arranged at the mask edge Potential configuration portion with a conductive material with take ground so that zero, from said upper particle arrangement mask by dropping the particles performing particle arrangement, it is characterized in.

  According to the present invention, the edge part of the mask part including the boundary between the opening part of the particle arrangement mask and the mask part is made into a frame shape and thicker than the other part of the mask part, or the edge of the mask part. Since the frame is configured so that the edge of the mask part does not warp by fixing the frame-like member different from the mask as a thick part so as to be thicker than the other parts of the mask part. The edge portion can easily adhere to the partition wall on which the mask is placed, and there is no gap between the partition wall and the mask portion. Particles that fall from above the mask for placement in the cell are below the mask portion. It can be prevented that the particle group is arranged in a cell where the particle group is not desired to be arranged.

  In addition, by making the edge of the mask part of the particle placement mask into a frame shape and thicker than other parts of the mask part, the mask is attracted to the magnet when it is configured so that the edge of the mask part does not warp. A frame-shaped thick portion for making the edge portion of the metal mask portion thicker than the metal mask portion is formed of at least another member different from the mask, The frame-like thick part is fixed so that the edge of the metal mask part is thicker than the other parts of the metal mask part, or the edge part of the mask part is made frame-like, and the other parts of the mask part The frame-like thick part for making it thicker than the part is composed of at least a metal member that can be attracted to the magnet, and the edge of the mask part is made into a frame shape and thicker than the other parts of the mask part. Magnetic field on the back side of the panel substrate. When the particle group is filled so that the edge of the mask portion is more difficult to warp, the edge of the mask portion is attracted to the magnet and a gap is formed between the top of the partition wall and the mask portion. Therefore, it is possible to prevent a particle group that has been dropped from above the mask to be placed in the cell from being placed in a cell under the mask portion where the particle group is not desired to be placed.

(A), (b) is a figure for demonstrating an example of a structure of the information display panel used as the object of this invention, respectively. (A), (b) is a figure for demonstrating the other example of a structure of the information display panel used as the object of this invention, respectively. (A), (b) is a figure for demonstrating the further another example of a structure of the information display panel used as the object of this invention, respectively. (A), (b) is a figure for demonstrating the further another example of a structure of the information display panel used as the object of this invention, respectively. (A)-(d) is a figure for demonstrating the drive system and display system in the information display panel used as the object of this invention, respectively. (A), (b) is a figure for demonstrating an example of the information display panel of the color display system classified by area used as the object of this invention, respectively. (A), (b) is a figure for demonstrating the other example of the information display panel of the color display system classified by area which becomes the object of this invention, respectively. (A), (b) is a figure for demonstrating an example of 1st Example of the particle | grain arrangement | positioning method using the particle | grain arrangement | positioning mask of this invention, respectively. (A), (b) is a figure for demonstrating the other example of 1st Example of the particle | grain arrangement | positioning method using the particle | grain arrangement | positioning mask of this invention, respectively. (A), (b) is a figure for demonstrating the further another example of 1st Example of the particle | grain arrangement | positioning method using the particle | grain arrangement | positioning mask of this invention, respectively. (A), (b) is a figure for demonstrating an example of 2nd Example of the particle | grain arrangement | positioning method using the particle | grain arrangement | positioning mask of this invention, respectively. (A)-(c) is a figure for demonstrating an example of the shape of the mask edge part thick part in the mask for particle arrangement | positioning of this invention, respectively. (A)-(c) is a figure for demonstrating an example of the particle | grain arrangement | positioning method using the particle | grain arrangement | positioning mask of this invention, respectively. (A), (b) is a figure for demonstrating an example of the usage example of the information display panel manufactured according to this invention, respectively. It is a figure for demonstrating the other example of the usage example of the information display panel manufactured according to this invention. It is a figure for demonstrating an example of the mother panel board | substrate which applies the mask for particle arrangement | positioning of this invention. (A)-(c) is a figure for demonstrating an example of the mask for particle arrangement | positioning used in the Example of this invention, respectively. (A)-(c) is a figure for demonstrating the other example of the mask for particle arrangement | positioning used in the Example of this invention, respectively. (A), (b) is a figure for demonstrating the test image 1 and the test image 2 which were respectively used by evaluation of the Example. (A), (b) is a figure for demonstrating an example of the particle | grain arrangement | positioning method using the conventional mask, respectively. (A), (b) is a figure for demonstrating an example of the conventional problem, respectively. (A), (b) is a figure for demonstrating the other example of the conventional problem, respectively.

  First, the configuration of the information display panel that is the subject of the present invention will be described. In the information display panel which is an object of the present invention, an electric field is applied to a display medium configured as a particle group containing charged particles, which is sealed between two opposing substrates. Along with the applied electric field direction, the display medium is attracted by an electric field force or a Coulomb force, and the display medium is moved by a change in the electric field direction, whereby information such as an image is displayed. Therefore, it is necessary to design the information display panel so that the display medium can move uniformly and maintain the stability when the display information is rewritten or when the display information is continuously displayed. Here, as the force applied to the particles constituting the display medium, in addition to the force attracting each other by the Coulomb force between the particles, an electric mirror image force between the electrode and the substrate, an intermolecular force, a liquid cross-linking force, gravity and the like can be considered.

  An example of an information display panel that is an object of the present invention will be described with reference to FIGS. 1 (a) and (b) to FIGS. 4 (a) and 4 (b).

  In the example shown in FIGS. 1 (a) and 1 (b), at least two types of display media having different optical reflectivity and charging characteristics (here, configured as a particle group including particles having at least optical reflectivity and chargeability) The white display medium 3W configured as a particle group including the negatively charged white particles 3Wa and the black display medium 3B configured as a particle group including the positively charged black particles 3Ba are shown). In the cell, in response to an electric field generated by applying a voltage to a pixel electrode pair formed by facing an electrode 5 (pixel electrode with TFT) provided on the substrate 1 and an electrode 6 (common electrode) provided on the substrate 2. The substrate 1 and 2 are moved vertically. Here, the pixels and the cells correspond to each other on a one-to-one basis, but the pixels and the cells may not correspond to each other on a one-to-one basis. Then, the white display medium 3W is visually recognized by the observer as shown in FIG. 1A, or the black display medium 3B is visually recognized by the observer as shown in FIG. 1B. Are displayed in a matrix with black and white dots. In addition, in FIG. 1 (a), (b), the partition in front is abbreviate | omitted.

  In the example shown in FIGS. 2A and 2B, at least two types of display media having different optical reflectance and charging characteristics (here, configured as a particle group including particles having at least optical reflectance and charging properties (here) The white display medium 3W configured as a particle group including the negatively charged white particles 3Wa and the black display medium 3B configured as a particle group including the positively charged black particles 3Ba are illustrated). In the cell, the substrate 1, 2 corresponds to an electric field generated by applying a voltage to a pixel electrode pair formed by the line electrode 6 provided on the substrate 2 and the line electrode 5 provided on the substrate 1 facing each other. And move vertically. Here, the pixels and the cells correspond to each other on a one-to-one basis, but the pixels and the cells may not correspond to each other on a one-to-one basis. Then, the white display medium 3W is visually recognized by the observer as shown in FIG. 2A, or the white display is displayed by the observer, or the black display medium 3B is visually recognized by the observer as shown in FIG. 2B. Are displayed in a matrix with black and white dots. In addition, in FIG. 2 (a), (b), the partition in front is abbreviate | omitted.

  The examples shown in FIGS. 3A and 3B and FIGS. 4A and 4B show examples of charged particle driving type information display panels that perform display rewriting using an external electric field forming unit. . In the example shown in FIGS. 3A and 3B, as shown in FIG. 3A, an information display panel is inserted between the upper and lower opposing pixel electrode pairs 8 and 9 as external electric field forming means for display. Rewrite. At that time, an electric field is applied to the information display panel from the external electric field forming means configured as the counter pixel electrode pair 8 and 9, and the display media 3B and 3W are driven. In this example, information is written in black on a white background screen. In the example shown in FIGS. 4A and 4B, as shown in FIG. 4A, the writer electrode 10 (such as an electronic pen) having the information display panel as an external electric field forming means is provided on the observation side panel substrate. The display information is rewritten along with the cooperation with the back-side conductive film 5. At that time, an electric field is applied to the information display panel from the external electric field forming means constituted by the writing device electrode 10 and the back-side conductive film 5 to drive the display media 3B and 3W. This example also shows a state where information is written in black on a white background screen.

  In addition, as a driving method of the information display panel which is an object of the present invention, a passive driving method, an active driving method, or a driving method combined with an external electric field forming unit can be used. In the case of passive driving, pixels (dots) are formed by overlapping portions of two substrates on which line electrodes are formed so that the line electrodes cross each other, or two sheets on which segment electrodes are formed. The substrate constitutes a segment pixel opposed to the segment electrode. In the case of active driving, the shape of a pixel electrode formed with a TFT can be controlled to form a pixel-shaped electrode pair.

  FIGS. 5A to 5D are diagrams for explaining a display method by passive drive and a display method by active drive in the information display panel which is the subject of the present invention, respectively. In the example shown in FIG. 5A, an example of pixel (sometimes referred to as “dot” or “pixel”) arrangement in a matrix display panel by passive drive composed of orthogonal line electrodes 5 and 6 is shown. In the example shown in FIG. 5 (b), an example of color display according to area comprising a display area 1 for white-and-red dot matrix display and a display area 2 for example black-and-white dot matrix display in a matrix display system panel similarly driven passively. Is shown. In the example shown in FIG. 5C, an example of pixel (sometimes referred to as “dot” or “pixel”) arrangement in a matrix display type panel by active driving using each counter electrode of the common electrode 6 and the pixel electrode 5 with TFT. Is shown. In the example shown in FIG. 5 (d), similarly in the matrix display system panel by active driving, color display by area composed of, for example, a display area 1 of yellow-red dot matrix display and a display area 2 of yellow-black dot matrix display, for example. An example is shown.

  FIGS. 6A, 6B, 7A, and 7B are diagrams for explaining an example of an information display panel of an area-specific color display system that is an object of the present invention. 6 (a), (b) and the example shown in FIGS. 7 (a), (b), the same members as those shown in FIGS. 1 (a), (b) and FIGS. 2 (a), (b) Are denoted by the same reference numerals, and the description thereof is omitted. In the example shown in FIGS. 6A and 6B, the display screen is divided into two areas on the left and right sides to form a black / white display area and a red / white display area, and an example of dot matrix type passive drive. Is shown. In the example shown in FIGS. 7A and 7B, the display screen is divided into two areas, a corner area and other areas, and a black / white display area and a red / white display area are shown. An example of dot matrix type active drive is shown. In the example shown in FIGS. 6A, 6B, 7A, and 7B, the black display medium 3W includes a group of particles including the positively charged black particles 3Wa, and the red display medium 3R includes a positive group. A group of particles including the chargeable red particles 3Ra is used as a white display medium, and a group of particles including the negatively charged white particles is used.

  Next, the particle arrangement method using the particle arrangement mask of the present invention is shown in FIGS. 8 (a), 8 (b), 9 (a), 9 (b), 10 (a), 10 (b), and FIG. This will be described with reference to (a), (b), FIGS. 12 (a) to 12 (c) and FIGS. 13 (a) to 13 (c).

  FIGS. 8 (a), (b), FIGS. 9 (a), (b) and FIGS. 10 (a), (b) are respectively for explaining an example of a particle arrangement method using the particle arrangement mask of the present invention. FIG.

  8A and 8B, in the example shown as a cross-sectional view, in addition to the members shown in FIGS. 1A and 1B and FIGS. The cell-dedicated partition wall 4-2 provided on the second electrode 6 and the panel-substrate gap securing partition / area boundary partition wall 4-3 provided on the electrode 6 of the substrate 2 are provided. In addition, a partition for securing a gap between panel substrates can be appropriately provided in the display area. Further, the particle placement mask is composed of a first particle placement mask 11 composed of an opening 11-1 and a mask portion 11-2, an opening 12-1 and a mask portion 12-2. The second particle arrangement mask 12 is used. The above configuration is the same as the conventional mask. FIGS. 8A and 8B show an example in which a transparent common electrode (ITO film) is provided on a transparent panel substrate (glass substrate) 2 on the observation side. The electrode may be provided, or the electrode (conductive film) may not be provided on the panel substrate. Furthermore, this particle arrangement method can be performed on the rear panel substrate.

  The feature of the particle arrangement mask of the present invention is that the edge portion of the mask portion is not warped by making the edge portion of the mask portion into a frame shape and thicker than other portions of the mask portion. Specifically, in the example shown in FIGS. 8A and 8B, in the first particle arrangement mask 11, the mask edge portion of the mask portion 11-2 is made thicker than the other portions in a frame shape. The mask edge frame-like thick part 11-3 is provided so as to be configured, and the mask edge part of the mask part 12-2 is made thicker than other parts in the frame shape in the second particle arrangement mask 12. Thus, the mask edge frame-like thick part 12-3 is provided so that the edge of the mask part does not warp. The mask shown in FIGS. 8A and 8B has a configuration in which the edge of the mask part is integrated with a continuous frame-like thick part to increase the rigidity of the edge of the mask part. I try not to warp. In addition, although the example of the continuous frame-shaped thick part was shown here, it can also be set as the intermittent discontinuous frame-shaped thick part. Further, in order to prevent the edge of the mask portion from warping, the mask edge thick portion (11-3, 12-3) formed of a highly rigid material is separated from the mask at the mask edge. It is configured to be fixed to the mask edge as a frame-like member of the mask, or the mask edge of the mask is made of a material having a large rigidity different from the other parts of the mask and difficult to warp. A mask edge thick part formed of a material having a large rigidity different from the above part is used as a member separate from the mask, and is fixed to the mask edge as a frame-like member intermittent to the mask edge. You can also. If the mask is made of a material having high rigidity such as a metal material, the edge of the mask part is made of the same material as the mask part and is made thicker than the other parts of the mask part. You can also. Furthermore, the thick part fixed as a frame-shaped member different from a mask to the edge part of the mask part mentioned above can also be made into the frame-shaped member comprised so that it might be attracted to a magnet.

  In the example shown in FIGS. 8A and 8B, first, as shown in FIG. 8A, a black display medium (black particle group) 3W is dropped from above the first particle arrangement mask 11. Then, it is filled in the cell 7 of the substrate 2 and arranged. In this example, the first particle arrangement mask 11 provided with the opening 11-1 in the area where the black display medium 3W is to be arranged is formed on the partition 4 (4-2, 4-3) formed on the substrate 2. The black display medium 3W is distributed from above the mask 11. On the other hand, since the area where the black display medium 3W is not desired to be arranged is masked by the mask unit 11-2, the black display medium 3W is not filled and arranged in the cell 7 under the mask. Since the rigidity of the edge of the mask portion is enhanced by the thick portion 11-3, it does not warp and there is no gap between the partition wall 4-3 and the mask portion. It is possible to prevent the black particles that are not desired to be arranged even from the cells positioned around the cell.

  Next, as shown in FIG. 8B, the red display medium (red particle group) 3R is filled and arranged in the cell 7 of the substrate 2 by dropping from above the second particle arrangement mask 12. However, before placing the mask 12, the black particles placed on the partition walls under the mask portion 12-2 are removed. Next, a second particle arrangement mask 12 having an opening 12-1 in an area where the red display medium 3R is to be arranged is formed on the partition 4 (4-2, 4-3) formed on the substrate 2. Then, the red display medium 3R is distributed from above the mask 12. On the other hand, since the area where the red display medium 3R is not desired is masked by the mask portion 12-2, the red display medium 3R is not filled and arranged in the cell 7 under the mask. Since the rigidity of the edge of the mask part is enhanced by the thick part 12-3, it does not warp and there is no gap between the partition wall 4-3 and the mask part. It is possible to prevent red particles that are not desired to be arranged around the cell located around the cell. After that, for example, a white display medium of the third color is filled and arranged in the entire cell 7, and then the panel substrate on the back side is bonded onto the partition wall 4 with an adhesive so that the white / black display display area and the white display medium are white. / An information display panel capable of color display by area consisting of a red display area is obtained. The information display panel shown in FIGS. 8A and 8B has a conductive film on the panel substrate, but an information display panel without a conductive film can be obtained in the same manner.

  FIGS. 9A, 9B, 10A, and 10B are diagrams for explaining the effects of the example shown in FIGS. 8A and 8B, respectively.

  The examples shown in FIGS. 9A and 9B show a case where another color display area is located in the lower right corner of the screen. FIG. 7A shows the partition wall by the first particle arrangement mask 11. 9 shows an example in which the first color particle group (for example, the black display medium 3B) is filled and arranged in the cell 7 formed by 4, and FIG. In the example, the second cell group (for example, the red display medium 3R) is filled and arranged in the formed cell 7. In the example shown in FIGS. 9A and 9B, the first particle arrangement mask 11 having the mask edge thick part 11-3 of the mask part and the mask edge thick part 12-3 of the mask part are provided. By using the second particle arrangement mask 12 having the rigidity of the edge of the mask portion is increased by the thick portion 11-3 and the thick portion 12-3, the area boundary portion is not warped. In addition, the adhesion between the mask portion 11-2 of the mask and the top of the partition wall at the edge of the mask portion around the mask portion is improved, and a gap is hardly formed between the top of the partition wall and the mask portion 11-2. As a result, the dispersed particles are not disposed around the gap between the mask and the partition wall to the cells below the mask portion.

  The example shown in FIGS. 10A and 10B shows a case where another color display area is located at the center of the screen. FIG. 10A shows the partition 4 by the first particle arrangement mask 11. FIG. 10B shows an example in which the first color particle group (for example, the black display medium 3B) is filled and arranged in the cell 7 formed by the above method, and FIG. In this example, the second color particle group (for example, the red display medium 3R) is filled and arranged in the cell 7 formed. In the example shown in FIGS. 10A and 10B, the first particle arrangement mask 1 having the mask edge thick portion 11-3 and the second particle arrangement having the mask edge thick portion 12-3. By using the mask 12, the edge portion of the mask portion is enhanced in rigidity by the thick portion 11-3 and the thick portion 12-3, so that the mask around the area boundary portion and the mask portion does not warp. The adhesion between the mask portion 11-2 of the mask at the edge portion and the top of the partition wall is improved, and a gap is hardly formed between the top of the partition wall and the mask portion 11-2. As a result, the dispersed particles are not disposed around the gap between the mask and the partition wall to the cells below the mask portion.

  In the particle arrangement method using the particle arrangement mask of the present invention described above, the mask edge serving as a boundary between the opening of the particle arrangement mask, the mask portion, and the mask portion edge around the mask portion is used as the other portion of the mask portion. Because the thick part was formed so as to be thicker than the part and increase the rigidity of the mask part edge part, the edge part of the mask becomes difficult to warp, and there is no gap between the partition wall and the mask. It is possible to prevent particles falling from above the mask from being placed in a cell under the mask portion where the particles are not desired to be placed.

  FIGS. 11A and 11B are views (cross-sectional views) for explaining another example of the particle arrangement method using the particle arrangement mask of the present invention. Particle placement masks (11, 12) shown in FIGS. 11 (a) and 11 (b) and particle placement masks (11, 12) shown in FIGS. 6 (a), 6 (b) to 8 (a), 8 (b). ) Is the arrangement method and arrangement position of the thick portions (11-3, 12-3) formed at the edge of the mask portion (11-2, 12-2). 8 (a) and (b) to FIG. 10 (a) and FIG. 10 (b) are the same as the examples shown in FIG. 11 (a) and FIG. The same effect as the example shown in FIGS. 10A and 10B can be obtained. The configuration of the particle arrangement mask is not a configuration in which the edge portion of the mask portion shown in FIGS. 8A and 8B is integrally formed with a continuous frame-like thick portion and a mask portion. It was set as the structure which fixed the continuous frame-shaped member to the edge with the adhesive as a thick part. In the example shown in FIGS. 11A and 11B, the edge thick portions (11-3 and 12-3) of the mask portion are the openings (11-1 and 12-1) and the mask portion ( 11-2 and 12-2) are preferably arranged with a space S of a maximum of 1 mm from the boundary. Further, the width W of the edge thick part (11-3, 12-3) of the mask part is preferably 1 to 10 mm, and the edge thick part (11-3, 12-3) of the mask part is set. The thickness H is preferably 1 to 3 mm. By setting the interval S, width W, and thickness H in the edge thick part of the mask part described above to be preferable ranges, an appropriate weight and an appropriate rigidity are given to the edge of the mask part, and the edge of the mask part Becomes more difficult to warp, and it becomes difficult to form a gap between the top of the partition wall and the mask.

  FIGS. 12A to 12C are diagrams (frame-like shapes) for explaining an example of the shape of the edge thick portion (11-3, 12-3) of the mask portion in the particle arrangement mask of the present invention. It is sectional drawing of the part which has arrange | positioned the thick member. In the example shown in FIG. 12A, the cross-sectional shape of the edge thick portion (11-3, 12-3) of the mask portion is a quadrangle. Moreover, in the example shown in FIG.12 (b), the cross-sectional shape of the edge thick part (11-3, 12-3) of a mask part is made into the trapezoid. Furthermore, in the example shown in FIG. 12C, the cross-sectional shape of the edge thick portion (11-3, 12-3) of the mask portion is a triangle. In any shape, it is possible to increase the rigidity of the edge portion of the mask portion that becomes the boundary between the opening portions (11-1, 12-1) and the mask portions (11-2, 12-2), and to prevent warping.

  FIGS. 13A to 13C are diagrams for explaining an example of a particle arrangement method using the particle arrangement mask of the present invention. In the example shown in FIGS. 13A to 13C, the panel substrate 1 (2) in which cells are formed by the partition walls 4 is set on the stage 21, and the particle placement mask 11 (12) of the present invention is formed on the partition walls 4. In a state where the particles are set, the particle group 23 is distributed and dropped from the nozzles 22 provided above the particle arrangement mask 11 (12), and the particles are arranged and filled. When performing the above-described particle arrangement method, the potential of at least a portion made of a conductive material is zero among the mask surface of the particle arrangement mask 11 (12), the mask member, and the frame-like thick portion of the mask portion edge. In the example shown in FIG. 13 (b), the frame-like thick portion (frame-like member) at the edge of the mask portion is grounded. It is preferable to make the potential zero in the mask, the mask portion edge near the mask opening through which the chargeable particles pass, and if there is a conductive mask member in the mask portion edge, ground the mask member portion, If there is a conductive frame-like thick portion at the edge of the mask portion, ground is taken at the frame-like thick portion, and if there is a surface of the conductive mask portion at the edge of the mask portion, ground is taken at the surface of the mask portion. In the example shown in FIG. 13 (c), when executing the above-described particle arrangement method, a metal material (here, stainless steel SUS304 and the thick portion 11-3 (12-3) of the mask portion is attracted to the magnet). The edge portion thick portion 11-3 (12-3) of the mask portion is adsorbed by the magnet 24 arranged on the back side of the panel substrate 1 (2), whereby the particle placement mask 11 (12 ) Of the mask portion is closely attached to the partition wall 4. The mask member of the particle arrangement mask 11 (12) may be a metal material attracted by a magnet or may not be a metal material attracted by a magnet. In the example shown in FIG. 13C, an aluminum mask is used, and a mask having a frame-like thick member made of stainless steel (SUS304) is fixed to the edge of the mask portion with a conductive adhesive. In any example, by providing the thick portion of the edge of the mask portion, the edge of the mask portion is configured not to warp, and the gap between the particle arrangement mask and the partition wall can be eliminated. In the example shown in FIG. 13A, when the mask is a conductive metal mask (metal mask), the thick portion 11-3 (12-3) of the edge of the mask is not a conductive material. The same effect as the example shown in FIG. 13B can be obtained by grounding the mask. In the example shown in FIG. 13 (c), the mask portion edge portion of the mask is made thicker by increasing the rigidity of the mask portion edge portion of the mask by making the mask portion edge portion of the mask thicker than the other portions of the mask portion. When it is configured so as not to warp, and at least the edge of the mask portion is configured to be attracted to the magnet, the effect of eliminating the gap between the particle placement mask and the partition wall is great.

  FIGS. 14A, 14B, and 15 are diagrams for explaining an example of use of the information display panel manufactured according to the present invention. The example shown to Fig.14 (a), (b) has shown the example used as an electronic shelf label. In the example of the electronic shelf label shown in FIG. 14A, the upper display area is configured as the white / black display area 31 and the lower display area is the white / red display area in the display area divided into two vertically. 32. At the boundary between the white / black display area 31 and the white / red display area 32, a red thick line 33 is displayed in the white / red display area 32 by a red display medium. In the example of the electronic shelf label shown in FIG. 14B, in the display area divided into the lower right corner and other parts, the display area in the lower right corner is configured as a white / red display area 32 and other displays. The area is configured as a white / black display area 31. At the boundary between the white / black display area 31 and the white / red display area 32, a black thick line 34 is displayed by the black display medium in the white / black display area 31. In the example of the electronic POP shown in FIG. 15, in the display area divided into the center and its peripheral part, the central display area is configured as a white / red display area 32 and the peripheral display area is displayed in white / black. The area 32 is configured. At the boundary between the white / black display area 31 and the white / red display area 32, a red thick line 33 is displayed in the white / red display area 32 by a red display medium.

  Next, each structural member of the information display panel which is the subject of the present invention and each structural member of the particle arrangement mask of the present invention will be described.

  As the panel substrate, any of substrates made of materials conventionally used for display panels, such as a glass substrate and a plastic substrate, can be used. Moreover, as a material for the particle arrangement mask, a general metal material, a metal material attracted by a magnetic force from a magnet, a conductive metal material, a plastic material, or the like can be used. As a material provided as a thick portion at the mask portion edge of such a mask, a material having high rigidity is preferable, and a metal material or a ceramic material is preferable. A conductive metal material is preferable because it can be grounded, and a metal material that is attracted by the magnetic force from the magnet can provide the effect of the present invention more effectively in cooperation with the magnet disposed on the stage on which the panel substrate is placed. preferable. Stainless steel (such as SUS430 and SUS304), nickel, and the like that are attracted by the magnetic force from the magnet, are strong against rust, have moderate rigidity, and are excellent in strength are preferably used.

  It is preferable to set the potential to zero in the mask. If the potential at the edge of the mask near the mask opening through which the conductive particles pass is zero, the charged particles are electrostatically attached to the edge of the mask opening. This is because it is difficult to cause inconvenience that it is difficult to pass through the mask opening. If the mask is non-conductive, it is preferable to cover the surface with a conductive material. However, if the frame-like thick portion of the mask edge is conductive, the mask member may remain non-conductive. What is necessary is just to take earth | ground at a conductive frame-like thick part, and what is necessary is just to be able to take earth | ground at any of the mask member which comprises a mask part edge part, a mask part surface, and a frame-like thick part.

  The interface between the mask part and the edge thick part of the mask part may be electrically connected or electrically insulated. Further, it is preferable that the thick portion of the mask edge is provided with its position aligned with the boundary with the opening or with a gap S of 1 mm or less. When the gap S exceeding 1 mm is left, the edge of the mask part is warped and it is easy to separate from the partition wall on which the mask is placed, and the effect of the present invention may not be obtained.

  The width W of the edge thick part of the mask part is preferably 1 mm to 10 mm. When the width W is smaller than 1 mm, it is difficult to form the thick edge portion of the mask portion. When the width W is larger than 10 mm, the entire mask for particle placement becomes heavy due to the weight of the thick portion of the mask edge portion. is there.

  The thickness H of the edge thick part of the mask part is preferably 1 mm to 3 mm. When the thickness is less than 1 mm, the rigidity of the thick portion of the edge of the mask portion is insufficient, the edge of the mask portion is warped, and it is easy to separate from the partition on which the mask is placed, and the effect of the present invention may not be obtained. . If it is thicker than 3 mm, there is a disadvantage that the whole particle arrangement mask becomes heavy due to the weight of the edge thick portion of the mask portion.

  The cross-sectional shape of the thick edge portion of the mask portion is preferably a quadrangle, trapezoid, or triangle that can be easily formed with high accuracy at the boundary between the mask portion and the opening.

  The stage on which the panel substrate is placed when filling and arranging the particle group may be made of any material as long as it has a smooth surface. However, it is preferable to be grounded, and a metal such as aluminum or stainless steel. A material, a ceramic material coated with a conductive material, or the like can be used. In addition, a metal material that is partly composed of a magnet and is provided as a metal particle arrangement mask attracted to the magnet or an edge thick portion of the mask portion of the particle arrangement mask, which is attracted by the magnetic force from the magnet As a magnet to be arranged on the stage in order to obtain the effect of cooperation with the magnet, an electromagnet can be used in addition to a magnet such as ferritic steel.

  The shape of a cell in which different types of display media are combined is based on a square or rectangular shape. Two or more areas for collecting different colors and displaying different colors are based on a square shape. It becomes a shape area. The electrodes provided on the panel substrate are arranged in a matrix as line electrodes and dot matrix display is performed by passive driving, the electrodes provided on the panel substrate is arranged in matrix as dot electrodes and dot matrix display is performed by active driving, It is possible to perform dot matrix display by driving the electrode pairs in a matrix arrangement and using an external electric field forming means.

  The partition provided between the panel substrates includes a partition having a function of securing a gap between the panel substrates, a partition having a function of suppressing movement of particles as a display medium in a direction parallel to the panel substrate, and a partition having both functions. The width of the partition for securing the gap between the panel substrates is preferably in the range of 20 μm to 100 μm, and the width of the partition dedicated for cell formation is preferably as narrow as possible in the range of 5 μm to 30 μm. Further, the cell-dedicated partition walls may be lower than the height of the panel substrate gap securing partition, and the range that does not impair the function of suppressing the movement of particles as a display medium in a direction parallel to the panel substrate. To do. Furthermore, the cell formation dedicated partition wall may be formed at a position facing both panel substrates, and may be configured to face each other when the panel substrates are bonded together. In this case, the facing portions may or may not be joined. Also good.

  The shape of the cell is a shape based on a square (including a square with rounded corners) that matches the pixel shape and pixel arrangement, and forms a square (square or rectangular), stepped octagon, or stepped hexagonal cell. The ribs are formed so as to correspond to the pixels arranged in a matrix, or formed without considering the correspondence with the pixels. From the point that particles constituting the display medium can be easily moved, a cell shape having a curve is preferable, and a shape with rounded corners is preferably used.

  A dry film resist material is preferably used as a material for forming a partition provided for securing a gap between substrates, a partition provided at an area boundary for performing a display color different from securing a gap between substrates, and a partition dedicated for cell formation. As an example, Alfo NIT2 (manufactured by Nichigo Morton) or PDF300 (manufactured by Nippon Steel Chemical Co., Ltd.) can be used.

  A dry film resist material having a thickness corresponding to the height of the partition wall to be formed is laminated on the panel substrate, and patterned by a photolithography method using a photomask having a predetermined shape.

  The width of the partition wall portion for securing the gap between the panel substrates is in the range of 20 μm to 100 μm, the width of the partition wall portion dedicated for cell formation is in the range of 5 μm to 30 μm, and the width of the partition wall portion dedicated for cell formation is between the panel substrates. The width should be smaller than the width of the partition for securing the gap.

  At the boundary of each display area, a boundary partition is formed as a partition that performs both functions of cell formation and securing the gap between panel substrates. Inside each display area, both functions of forming cells and securing the gap between panel substrates are provided. And the partition wall for cell formation, and the relationship between the widths of the partition walls is such that the width of the partition wall serving both functions of cell formation and securing the gap between panel substrates is greater than the width of the cell formation partition wall. Is preferred. When the width of the area boundary partition wall is increased, the boundary of the display area becomes clear and the adhesive used for bonding to the panel substrate can be widely arranged and firmly bonded. In addition, the width of the partition walls for both the function of forming the cells arranged inside each display area and securing the gap between the panel substrates is set in a range of 20 μm to 100 μm, and the width of the partition walls for forming cells arranged inside each display area is It is also preferable to make it the range of 5 micrometers-30 micrometers. Since the partition wall is a non-display part, it is desired to make the partition wall as narrow as possible. However, in order to secure the gap between the panel substrates, the strength is sufficient to support the substrate, and the range that can be met is the above range. The cell forming partition does not need to have a function of supporting the substrate and can be made thin, and the range of the width that can be actually manufactured is the above range.

  When a conductive film is provided on the panel substrate and disposed as a counter electrode, the transparent conductive film provided in the display area on the transparent substrate side is made of indium tin oxide (ITO), indium oxide, zinc-doped indium oxide ( Transparent conductive metal oxides such as IZO), aluminum-doped zinc oxide (AZO), antimony tin oxide (ATO), conductive tin oxide, and conductive zinc oxide, and transparent conductive polymers such as polyaniline, polypyrrole, and polythiophene Is mentioned.

  Examples of the material of the conductive film provided outside the display area of the back side substrate and the transparent substrate include indium tin oxide (ITO), indium oxide, zinc doped indium oxide (IZO), aluminum doped zinc oxide (AZO), antimony tin oxide ( ATO), conductive metal oxides such as conductive tin oxide and conductive zinc oxide, conductive polymers such as polyaniline, polypyrrole and polythiophene, metals such as gold, silver, copper, aluminum, nickel and chromium, The alloy which has these metals as a main component is mentioned. The conductive film provided inside and outside the display area of the back side substrate and the conductive film provided outside the display area of the transparent substrate may be transparent or may not be transparent.

  As a method for forming a conductive film, a method of forming the above-described materials into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or a method of laminating metal foil (for example, rolled copper foil) A method of mixing a conductive agent with a solvent or a synthetic resin binder and applying the conductive agent is used. The above-mentioned material that can be patterned into an electrode shape and is conductive can be suitably used. In addition, the thickness of the conductive film provided in the display area of the observation-side transparent substrate is not particularly limited as long as the conductivity can be ensured and the light transmittance is not hindered, and is preferably 0.01 to 10 μm, and more preferably 0.05 to 5 μm. In addition, the thickness of the conductive film provided on the back substrate is only required to ensure conductivity, and is set in a range of 0.01 to 10 μm.

  Metal oxide transparent conductive materials such as ITO are less flexible than metal materials. When providing a conductive film in the display area of the observation-side substrate, it is preferable to use it together with a fine metal wire in order to prevent disconnection in the transparent conductive film. The width of the fine metal wire is preferably 1 μm to 10 μm because it does not hinder display visibility. In particular, when the conductive film is provided in a line shape, in addition to preventing disconnection, the electrical resistance of the line-shaped conductive film can also be reduced, so it is more preferable to use a thin metal wire in combination. In the case of the conductive film of the back side substrate, the metal material having a small electric resistance and excellent flexibility is preferably used since it is not necessary to consider light transmittance particularly in the case of a line shape.

  Hereinafter, an actual example will be described.

<Configuration of the produced information display panel>
An information display panel that can perform color display by area by changing the type of display medium to be arranged between the display area of 1/6 screen located at the lower right of the horizontally long A7 size display area (full screen) and other display areas A mother panel capable of obtaining four pieces was prepared, and the mother panel was divided into four to obtain an information display panel.

  The mother panel substrate on the observation side is a striped electrode formed by patterning a transparent indium tin oxide (ITO) film in the display area of the information display panel on one side of a polyethylene terephthalate (PET) film (thickness 125 μm). The mother panel substrate on the back side is transparent in the display area of the information display panel on one side of a polyethylene terephthalate (PET) film (thickness 125 μm). An indium tin oxide (ITO) film was patterned to form stripe electrodes (width 300 μm, space 50 μm).

  In the display area on the observation-side mother panel substrate, a partition wall having a width of 50 μm and a height of 50 μm is formed in a lattice shape, and a cell space of 300 μm □ (300 μm × 300 μm) is formed in a one-to-one correspondence with a pixel. After forming and filling the display medium in the cell, two mother panel substrates are bonded to each other so that the stripe electrodes cross each other at right angles, and the mother panel is divided into four. Four information display panels were produced.

  The display area cells corresponding to 1/6 screens of each display area are arranged by combining two types of display media, a white display medium and a red display medium, and the other display area cells include a white display medium. An information display panel having a configuration having two display areas, a white-red display area and a black-and-white display area, is provided by combining two types of display media, ie, a black display medium and a black display medium.

<Preparation of display medium>
・ Negatively charged white particles constituting white display medium 100 parts by weight of polymethylpentene polymer (TPX-R18: manufactured by Mitsui Chemicals) and 100 parts by weight of titanium dioxide (Taipaque CR-90: manufactured by Ishihara Sangyo Co., Ltd.) as a colorant And 5 parts by weight of a phenol-based condensate (Bontron E89: manufactured by Orient Chemical Co., Ltd.) as a negatively charged charge control agent are melt-kneaded with a twin-screw kneader, and a jet mill (Lab Jet Mill IDS-LJ type: Nippon Pneumatic ( Co., Ltd.), finely pulverized, classified using a classifier (MDS-2: Nihon Numatic Kogyo), melt spheronized using a melt spheronizer (MR-10: Nihon Numatic Kogyo), Negatively charged white particles having an average particle diameter of 9.5 μm were obtained. A white particle group was prepared using the white particles as a main component and used as a white display medium.

-Positively chargeable black particles constituting a black display medium 100 parts by weight of polymethylpentene polymer (TPX-R18: manufactured by Mitsui Chemicals) and 5 parts by weight of carbon black (special black 4: manufactured by Degussa) as a colorant And 3 parts by weight of a nigrosine compound (Bontron N07: manufactured by Orient Chemical Co., Ltd.) as a positively charged charge control agent are melt-kneaded with a twin-screw kneader, and a jet mill (Lab Jet Mill IDS-LJ type: Nippon Pneumatic Co., Ltd.) )), Finely pulverized using a classifier (MDS-2: Nihon Numatic Kogyo), melt spheronized using a melt spheronizer (MR-10: Nihon Numatic Kogyo), average Positively charged black particles having a particle diameter of 9.2 μm were obtained. A black particle group was prepared using the black particles as a main component and used as a black display medium.

-Positively charged red particles constituting the red display medium 100 parts by weight of polymethylpentene polymer (TPX-R18: manufactured by Mitsui Chemicals), 5 parts by weight of a red pigment (CI Pigment Red 2) as a colorant, 3 parts by weight of a nigrosine compound (Bontron N07: manufactured by Orient Chemical Co., Ltd.) as a positively charged charge control agent is melt-kneaded with a twin-screw kneader, and a jet mill (Lab Jet Mill IDS-LJ type: manufactured by Nippon Pneumatic Co., Ltd.) ), Finely pulverized using a classifier (MDS-2: Nihon Numatic Kogyo), melt spheroidized using a melt spheronizer (MR-10: Nihon Numatic Kogyo), and average particle size However, a positively charged red particle group of 9.0 μm was obtained. The red particles were prepared using the red particles as a main component and used as a red display medium.

<Examples and Comparative Examples>
A metal mask made of SUS304 having a thickness of 100 μm having an opening corresponding to the type of display medium to be arranged was used. The mask of each example was configured to provide a frame-like thick portion at the edge of the mask portion, and the mask of each comparative example was configured not to provide a frame-like thick portion at the edge of the mask portion. The structure in which the frame-like thick part is provided at the edge of the mask part is a structure in which the frame-like thick part and the mask part are integrally molded with SUS304, and the mask part edge of the SUS304 mask is a separate member from the mask. The SUS304-made frame-like member formed as was fixed with an epoxy adhesive. The particle group used as the display medium is filled and arranged in cells in a predetermined area of the mother panel substrate in sequence using a distribution method using a mask having an opening and a mask unit that match the type of the particle group. did. As the stage for placing the mother panel substrate used in the distribution method, two types of stages, an alumina plate stage and a magnet stage in which a ferrite magnet plate is arranged on the alumina plate, are prepared. In each example and each comparative example We carried out properly. In Examples and Comparative Examples, in order to make the potential at the edge of the mask portion zero, grounding was performed at either the frame-like thick portion made of SUS304 or the edge portion of the mask portion made of SUS304.

  First, as shown in FIG. 16, a mother panel substrate for preparing four information display panels each having a monochrome display area and a white-red display area at a time was prepared. As a specific particle arrangement mask, a particle arrangement mask shown in FIGS. 17 (a) to 17 (c), in which a mask edge thick portion is formed as a continuous frame-like thick portion, and FIG. 18 (a). The particle arrangement mask shown in (c) was arranged in a frame shape in which the mask edge thick part was intermittently arranged on the peripheral edge of the mask and fixed with an epoxy-based adhesive. In the examples shown in FIGS. 17A to 17C and FIGS. 18A to 18C, a mother panel substrate capable of obtaining four information display panels configured to perform color display by area. The particle arrangement mask is configured such that a different color display medium can be arranged for each area. Here, a black particle group as a black display medium, a red particle group as a red display medium, and a white as a white display medium 3 shows three masks used when filling and arranging particle groups.

  The actual particle placement operation is as follows. First, the red display medium placement mask shown in FIG. 17 (a) or FIG. 18 (a) is placed on the mother panel substrate to place a group of red particles, and on the partition wall in the mask opening. The red particles on the surface were removed. Next, the black display medium placement mask shown in FIG. 17B or FIG. 18B is placed on the mother panel substrate to place a group of black particles, and the black particles placed on the partition walls in the mask opening are removed. did. Thereafter, the white display medium placement mask shown in FIG. 17 (c) or FIG. 18 (c) is placed on the mother panel substrate to place white particle groups, and the white particles placed on the partition walls in the mask opening are removed. Then, it was bonded to the other mother panel substrate to obtain a mother panel.

  The information display panel for evaluation of each example and comparative example manufactured according to the method described above is composed of a white / red display region in the lower right corner and other white / black display regions, and information The performance evaluation as a display panel is performed by a black thick line test image 1 using a black display medium displayed in the white / black display area at the boundary between the white / black display area and the white / red display area (FIG. 19A). In the example shown in FIG. 19B, a red thick line test image 2 using a red display medium displayed in the white / red display area at the boundary between the white / black display area and the white / red display area (FIG. 19B). The display state of) is magnified 50 times and visually observed, so that the display state using cells arranged in the vicinity of the boundary of the area where the color mixture of particles as a display medium has conventionally occurred From this, the particle arrangement state was evaluated. For the test image 1, the display state is evaluated based on whether the black thick line image is an image having no red color mixture, and for the test image 2, the red thick line image is an image having no black color mixture. The display state was evaluated. The results are shown in Table 1 below.

  From the results shown in Table 1, the information display panels according to Examples 1 to 7 in which the particles are arranged using the particle arrangement mask of the present invention are arranged using the conventional particle arrangement mask. Compared to the information display panels according to Comparative Examples 1 and 2, it can be seen that the information display panel can obtain a good image free from problems due to color mixing of particles in the cells near the boundary of the display area.

  An information display panel manufactured by applying the present invention is used as an electronic POP (Point of Presence, Point of Purchase advertising) or an electronic shelf label, as well as a mobile device such as a notebook computer, a PDA, a mobile phone, and a handy terminal. Electronic paper such as display units, electronic books, electronic newspapers, electronic manuals (instruction manuals), billboards such as signboards, posters, blackboards, display units such as calculators, home appliances, and automobiles, point cards, cards such as IC cards Display unit, electronic advertisement, electronic price tag, electronic score, display unit of RF-ID device, display unit connected to external display rewriting means, display rewriting and display rewriting using external electric field forming means It is also suitably used as (so-called rewritable paper).

1, 2 Substrate 3W White display medium 3Wa Negatively charged white particle 3B Black display medium 3Ba Positively charged black particle 3R Red display medium 3Ra Positively charged red particle 4 Partition 4-2 Cell formation dedicated partition 4-3 Gap between panel substrates Securing partition and area boundary partition 5, 6 Conductive film (electrode)
7 cell 8, 9 counter pixel electrode (external electric field forming means)
DESCRIPTION OF SYMBOLS 10 Writer electrode 11 1st particle | grain arrangement | positioning mask 11-1, 12-1 Opening part 11-2, 12-2 Mask part 11-3, 12-3 Mask edge part thick part 12 For 2nd particle | grain arrangement | positioning Mask 21 Stage 22 Nozzle 23 Particle group 24 Magnet 31 White / black display area 32 White / red display area 33 Red thick line display 34 Black thick line display

Claims (9)

  A display medium arranged in a panel space formed by opposing two panel substrates, at least one of which is transparent, facing each other, and configured as a group of particles containing chargeable particles by an electric field formed between the opposing panel substrates Openings adapted to each display area used when disposing different types of display media in each display area when the information display panel for displaying information by driving the medium is manufactured. And a particle placement mask having a mask portion, wherein the edge portion of the mask portion is formed in a frame shape and thicker than other portions of the mask portion so that the edge portion of the mask portion does not warp. A particle placement mask characterized by comprising:   The frame-like thick part for making the edge of the mask part into a frame shape and thicker than the other parts of the mask part is a continuous frame-like thick part, or an intermittent frame-like thick part The particle arrangement mask according to claim 1, wherein the particle arrangement mask is any one of the following.   A frame-like thick portion for making the edge of the mask portion into a frame shape and thicker than other portions of the mask portion is formed of a member different from the mask, and the frame-like thick portion is The edge part of a mask part is comprised so that the edge part of a mask part may not warp by fixing so that the edge part of a mask part may become thicker than the other part of a mask part. Particle placement mask.   The mask is made of a metal material, and the frame-shaped thick portion for making the edge of the metal mask portion thicker than the metal mask portion is formed as a member at least different from the mask, The frame-shaped thick portion is fixed so that the edge of the metal mask portion is thicker than the other portions of the metal mask portion, so that the edge of the metal mask portion does not warp. 3. The particle arrangement mask according to claim 1, wherein the particle arrangement mask is configured.   A frame-shaped thick portion for making the edge of the mask portion thicker than the other portions of the mask portion is made of a metal member attracted to a magnet, and the edge of the mask portion is framed 3. The particle placement mask according to claim 1, wherein the mask is configured such that the edge of the mask portion does not warp by making it thicker than other portions of the mask portion.   The mask is made of a metal material that can be attracted to the magnet, and the frame-shaped thick portion for thickening the metal mask portion is at least a member different from the mask. The frame-shaped thick portion is fixed so that the edge portion of the metal mask portion is thicker than the other portions of the metal mask portion, whereby the edge portion of the metal mask portion is bent. The particle arrangement mask according to claim 1, wherein the particle arrangement mask is configured not to be formed.   When arranging a particle group as a display medium in a cell surrounded by a partition on a panel substrate, the particle placement mask according to any one of claims 1 to 6 is placed on the partition, and the particle A particle arrangement method used for manufacturing an information display panel, wherein particles are arranged by dropping a particle group from above an arrangement mask.   When disposing the particle group as the display medium in the cell surrounded by the partition on the panel substrate, the particle placement mask according to claim 5 or 6 is placed on the partition and disposed on the back side of the panel substrate. The particle placement mask is closely attached onto the partition wall by a magnet, and the particle placement is performed by dropping a particle group from above the particle placement mask. This is used for manufacturing an information display panel. Particle placement method.   When arranging a particle group as a display medium in a cell surrounded by a partition on a panel substrate, the particle placement mask according to any one of claims 1 to 6 is placed on the partition, and the particle The grounding is performed so that the potential of at least a portion made of the conductive material disposed on the edge portion of the mask for placement is zero, and the particles are dropped from above the particle placement mask to place the particles. The particle | grain arrangement | positioning method used for manufacture of the information display panel characterized by the above-mentioned.

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