JP2018180212A - Display panel and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display panel capable of shortening a distance between a display part of unit electronic paper and a display part of different unit electronic paper adjacent thereto, to a width of a non-display part of each unit electronic paper and a shared seal part therebetween, and as a result, making a joint portion between pieces of unit electronic paper sufficiently inconspicuous, and making a frame-like joint portion narrower.SOLUTION: A display panel includes composite electronic paper having plural pieces of unit electronic paper arranged adjacent to each other, the unit electronic paper interposed between a front barrier film and a rear barrier film while having a seal part on a periphery. Seal parts of adjacent pieces of electronic paper serve as a shared seal part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display panel, and more particularly, to a display panel suitable for displaying on a large screen formed of a plurality of composite electronic papers in which unit electronic papers are arranged adjacent to each other, and a method of manufacturing the same. About.

  As such a display panel, the size of the single panel is limited due to the restrictions of the manufacturing surface, etc., and a plurality of liquid crystal display panels are vertically adjacent and composited to form a large screen.

  Electronic paper is classified into an electrophoresis method, a twist ball method, a liquid crystal display panel method using a liquid crystal display element, and the like according to the difference in display method. The electrophoresis method is a method of moving charged particles in a liquid. The twisting ball method is a method of rotating charged particles which are divided into two colors. A liquid crystal display element is a non-self light emitting display element having a structure in which a liquid crystal layer is sandwiched between a pixel electrode and a counter electrode. Among these various methods, liquid crystal displays are currently widely used in various applications because they are thin and can be miniaturized. Electrophoresis is being developed as another display method aiming to further reduce the thickness and ultra-low power consumption of such liquid crystal displays.

  Furthermore, it is expected that electronic paper, which can hold display images even without power supply and can electrically rewrite the display content, will rapidly spread in the future. Electronic paper is to realize ultra-low power consumption that can display memory even when the power is turned off, a reflective display that is gentle on the eyes, and a flexible, thin display with flexibility like paper. Research is in progress for From such a point of view, an electrophoresis method is preferable as the electronic paper.

  Electronic paper is considered to be applied to display units such as electronic books, electronic newspapers, and electronic shelf labels. Particularly in the case of electronic shelf labels, the display unit is particularly large in width, and the frame is required to be narrow.

JP, 2013-156452, A

  By the way, on the shelf label display panel made of electronic paper, as shown in FIG. 7 and FIG. 8, the non-display portion 3 where the display electrode is not present or the non-display is not provided outside the display portion 1 where the display electrode is formed. A seal portion 6 and a terminal portion 9 for bonding the front barrier film 4 and the rear barrier film 5 provided on the outer side of the portion 3 exist.

  Therefore, as shown in FIGS. 9 and 10 as a large display panel for shelf labels using a plurality of electronic papers, in the case of a large display panel in which two electronic papers 20 are adjacent to each other, one electronic paper 20 is adjacent to it. The joint portion 12 with the other electronic paper 20 is noticeable, and since there are two seal portions between the display portion and the adjacent display portion, the space between the display portion and the adjacent display portion is widened. There was a problem that the visibility and appearance of the large display would be deteriorated.

  The present invention has been made in view of such problems, and it is possible to make the distance between the display parts of each electronic paper adjacent to each other close, and it comprises a non-display part and a seal part in which the electronic papers are collected. An object of the present invention is to provide a display panel which has a narrow frame portion and can realize good display with a large screen.

  In order to achieve the above object, the display panel according to claim 1 of the present invention is characterized in that unit electronic papers sandwiched between the front barrier film and the back barrier film and having a seal portion in the periphery are adjacent to each other In a display panel made of a plurality of arranged composite electronic papers, the seal between adjacent unit electronic papers is a common seal.

  A feature of the display panel according to claim 2 is that the back barrier film is a single back barrier film over the entire display panel.

  A feature of the display panel according to claim 3 is that the entire display panel is a single front barrier film.

  The display panel according to claim 4 is characterized in that the display panel is composed of a plurality of composite electronic paper in which a plurality of unit electronic paper sheets sandwiched between a unit front barrier film and a unit back barrier film are adjacent to each other. The end of the film and the end of the unit back barrier film are offset in plan view in the portion between the unit electronic paper, and the unit front barrier film of one unit electronic paper and the unit electronic adjacent to one unit electronic paper At least a part of the unit back barrier film of paper has an overlap in plan view.

  A feature of the display panel according to claim 5 is that it is an electrophoretic electronic paper panel.

  A feature of the method of manufacturing a display panel according to claim 6 is the step of forming the seal portion in a state where the unit electronic paper is sandwiched between the front barrier film and the back barrier film, and adjacent units of the seal portion. The step of forming the seal portion between the electronic papers comprises a step of wetting and spreading the sealing material by capillary action and a step of curing the sealing material.

  By adopting the configuration as in claim 1, the distance between the display unit of the unit electronic paper and the display unit of another unit electronic paper adjacent thereto is determined by the non-display unit of each unit electronic paper Therefore, it is possible to reduce the width of the common sealing portion between them, and as a result, it is possible to make the joint between unit electronic papers sufficiently inconspicuous and to narrow the frame-like joint.

  By adopting the configuration according to claim 2, the width of the seal portion filling the gap between the unit electronic paper is narrowed, and the strength of the joint portion is increased by the integration of the back barrier film, thereby having high reliability. be able to.

  By adopting the configuration according to claim 3, the width of the seal portion filling the gaps between the unit electronic paper is further narrowed, and the strength of the joint portion is further increased by the integration of the front barrier film, thereby further enhancing the reliability. Can have sex.

  By adopting the configuration as claimed in claim 4, the adhesion area by the sealing material between unit electronic papers is increased, and the strength of the joint portion is increased, whereby high reliability can be provided.

  By adopting the configuration according to claim 5, it is possible to make a very bright large display with ultra low power consumption, and conventionally, it takes time and labor to stick hand-painted or printed paper etc. It is possible to easily change or update the display content of the display panel made of composite electronic paper in which a plurality of unit electronic papers are arranged adjacent to each other.

  By adopting the manufacturing method as claimed in claim 6, the sealing material can be prevented from protruding from the upper and lower sides of the sealing portion. That is, it is possible to reduce the thickness of a large display panel made of composite electronic paper in which a plurality of unit electronic papers are disposed adjacent to each other.

It is a schematic plan view showing an example of an embodiment of a display panel concerning the present invention. FIG. 2 is a schematic broken side view of a cross section C-C ′ of the display panel shown in FIG. It is an outline top view showing an example of individual electronic paper concerning the present invention. FIG. 4 is a schematic cutaway side view of the D-D ′ cross section of the individual electronic paper shown in FIG. 3. FIG. 9 is a schematic broken side view showing an embodiment of a display panel showing another embodiment different from FIG. 2; FIG. 10 is a schematic broken side view showing an embodiment of a display panel showing another embodiment different from FIGS. 2 and 5; It is a schematic plan view which shows an example of the conventional electronic paper. It is a schematic broken side view of the A-A 'cross section of the conventional electronic paper shown in FIG. It is a schematic plan view which shows the conventional display panel. FIG. 10 is a schematic broken side view of the B-B ′ cross section of the conventional display panel shown in FIG. 9.

  Hereinafter, embodiments of a display panel according to the present invention will be described with reference to FIGS. 1 to 6.

  The same or similar parts as in the prior art and the basic configuration will be described using the same reference numerals.

  The following description is based on a display panel composed of composite electronic paper in which two unit electronic papers are horizontally adjacent in order to simplify the description, but actually, a display panel in which a large number of sheets are connected and a display panel connected vertically and horizontally It is often the case.

  The display panel 30 in the present embodiment is a display panel 30 formed of composite electronic paper in which two unit electronic papers 10 are horizontally adjacent to each other as shown in FIG. It is arranged as

  Then, in the present embodiment, at least one side of the seal portion of each unit electronic paper 10 overlaps with one side of the seal portion of another adjacent unit electronic paper 10.

  That is, as shown in FIG. 2, with respect to two unit electronic papers 10 adjacent to each other in the lateral direction, the left end 10a of the unit electronic paper 10 located on the right is the right end of the unit electronic paper 10 located on the left It is stacked under 10b.

  This facilitates butt-matching of the unit electronic papers 10 adjacent to each other, and facilitates formation of the seal portion 6, and the distance between the display portions 1 of the unit electronic papers 10 adjacent to each other is unit electronic The width can be shortened to only the width constituted by the left end 10a of the paper 10, the right end 10b of the unit electronic paper 10, the non-display portion 3 and the seal portion 6, and as a result, the joint portion 12 of each electronic paper panel 10 Can be made sufficiently inconspicuous. Moreover, the sealing part between front barrier film 4 and back barrier film 5 can be made into minimum width by this.

  In the present embodiment, as shown in FIG. 3 and FIG. 4, the display panel 30 in the present embodiment can be obtained by shifting the front barrier film 4 and the rear barrier film 5 on the electronic paper panel 10 in different directions. Are arranged as shown in FIG. The shift amount of the front barrier film 4 and the back barrier film 5 on the electronic paper panel 10 can be arbitrarily determined by the width of the seal portion 6 of the display panel 30.

  Thereby, the distance between the display portions 1 adjacent to each other can be shortened by providing the left end portion 10a of the unit electronic paper 10 and the right end portion 10b of the unit electronic paper 10 with an overlapping portion. The width of the seal portion 6 of 30 can be narrowed, and the frame can be narrowed.

  Furthermore, in the present embodiment, as shown in FIG. 2, each electronic paper panel 10 is disposed in the state of the sealing portion 6 by being sealed by the wetting and spreading of the sealing material due to the capillary phenomenon.

  As a result, the electronic paper panels 10 adjacent to each other are overlapped, and sealing is performed by wetting and spreading of the sealing material due to capillary phenomenon, so that the sealing material does not protrude from the top and bottom of the sealing portion of each electronic paper panel. The thickness can be reduced.

  Furthermore, the present invention is not limited to the configuration shown in FIGS. 1 and 2, and may be configured as shown in FIGS. That is, in FIG. 5, the unit electronic paper 10 is not used, and a plurality of display units 1 on which display electrodes are formed and a non-display unit 3 on which no display electrodes are formed It is set as the structure bonded together by the film 8. FIG. In this case, the seal portion 6 between the display portions 1 adjacent to each other can be further shortened than the configuration shown in FIGS. 1 and 2, and the distance between the display portions 1 adjacent to each other can be shortened. , It is possible to make the joint portion 12 less noticeable.

  In FIG. 6, the unit electronic paper 10 is not used, and a plurality of the display unit 1 on which the display electrodes are formed and the non-display unit 3 on which the display electrodes are not The back barrier film 8 is configured to be bonded. In this case, the seal portion 6 between the display portions 1 adjacent to each other can be further shortened than the configuration shown in FIG. 5, and the distance between the display portions 1 adjacent to each other can be shortened. It is possible to make 12 less noticeable even better. Then, the sealing material can also be prevented from protruding to the upper and lower sides of the large display panel 30.

  Further, in the present embodiment, it is particularly preferable to use a display panel of electrophoretic electronic paper in which charged particles are moved in a liquid. Since a display panel of this type of electrophoretic electronic paper is a so-called memory reflective device, it can provide extremely bright display with very low power consumption.

  By making the structure of the present invention the structure of the present invention, for example, as shown in FIG. 2, the width of the seal portion of the display panel is 1 mm that is half that of the conventional large display panel, which is 2 mm. Realize, the seams become less noticeable.

As a manufacturing method, the front barrier film 4 and the back barrier film 5 are shifted in different directions as shown in FIG. 3 and FIG. 4 on the top and bottom of the display 1 where the display electrodes are formed and the non-display 3 where no display electrodes are present. Paste together. At that time, as the back barrier film, only the protruding portion 10c in FIG. 3 (dotted line portion: a portion cut off at the time of completion of the large panel) is adhered with a 2 mm larger than the front barrier film outer shape. Next, a plurality of the electronic paper 10 of FIGS. 3 and 4 is overlapped at the end of the electronic paper 10 as shown in FIGS. 1 and 2. Then, a seal material is applied on the back barrier film whose outer shape is made larger than the front barrier film by a dispenser, and the seal material is wetted and spread on the seal portion by capillary action.

  Finally, the sealing material is cured, and the protruding portion 10c of the back barrier film and the sealing material thereon are cut according to the external size of the front barrier film, and the desired size is obtained. To make a display panel. In addition, the display panel of FIG. 5 of the structure of the present invention is manufactured by the same manufacturing method as the manufacturing method of FIG. 2 except that the back barrier film is integrated.

  Further, by making the display panel as shown in FIG. 6 of the structure of the present invention, the width of the seal portion of the display panel is 1 mm or less, realizing further narrowing of the frame, and the joint portion becomes less noticeable.

  As a manufacturing method, as shown in FIG. 6, a front barrier film 7 as a whole and a back one as a whole on the display 1 and the non-display 3 where no display electrodes are formed. The barrier film 8 is laminated. At that time, the back barrier film 8 of one sheet as a whole is pasted together by the whole of which the outer shape is 2 mm larger than the front barrier film 7 of one sheet. Then, the seal material is applied on the back barrier film 8 of one sheet by a dispenser which is 2 mm larger than the front barrier film 7 of the whole sheet, and the seal material is spread on the seal portion by capillary action. Finally, the sealing material is cured to conform to the outer size of the front barrier film as a whole, and the entire back barrier film and the seal on the entire surface project out larger than the front barrier film as a whole. The material is cut to make a display panel of the desired size.

DESCRIPTION OF SYMBOLS 1 display part 3 non-display part 4 front barrier film 5 back barrier film 6 seal part 7 whole front barrier film 8 whole back barrier film 9 terminal part 10, 20 unit electronic paper 10a left end part 10b right end Part 10c Overhang part 12 Joint part 30 Display panel

Claims (6)

  Seal between adjacent unit electronic papers in a display panel composed of a plurality of composite electronic papers arranged so that unit electronic papers sandwiched between the front barrier film and the back barrier film and having a seal part are adjacent to each other A display panel characterized in that the part is a shared seal part.   The display panel according to claim 1, wherein the back barrier film is one back barrier film in the entire display panel.   The display panel according to claim 1 or 2, wherein the front barrier film is one front barrier film in the entire display panel.   In a display panel comprising a plurality of composite electronic paper in which a unit electronic barrier film and a unit electronic barrier sandwiched between unit electronic papers are disposed adjacent to each other, an end portion of the unit external barrier film and an end of the unit rear barrier film The parts are offset in plan view in the part between unit electronic papers, and at least a part of the unit front barrier film of one unit electronic paper and the unit back barrier film of the unit electronic paper adjacent to one unit electronic paper The display panel according to claim 1, wherein the display panel has an overlap in a plan view.   The display panel according to any one of claims 1 to 4, wherein all the unit electronic papers are of electrophoresis type.   The method for manufacturing a display panel according to any one of claims 1 to 5, further comprising the step of forming a seal portion in a state in which the unit electronic paper is sandwiched between the front barrier film and the back barrier film. A method of manufacturing a display panel comprising the steps of forming a seal portion between adjacent unit electronic papers of the seal portion by a step of wetting and spreading the seal material by capillary action and a step of curing the seal material.

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