JP2014157206A - Large display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mechanical strength of a large display system formed by aligning a plurality of display units formed by aligning a plurality of organic EL panels in flat plane.SOLUTION: A display unit 4 is formed by aligning slender rectangular organic EL panels 5 in a direction parallel to a longer direction of the panels. Transparent protective films 11a to 11d are attached on the display unit in a direction orthogonal to the longer direction of the organic EL panels 5. In this arrangement, a joint between the transparent protective films 11 attached on regions adjacent to one another is arranged on an inter-pixel gap which is a non-luminous portion between pixels, thereby making the joint inconspicuous and suppressing influences on image quality.

Description

  The present invention relates to a large-sized display device that includes a display unit in which a plurality of flat display panels are arranged in a plane, and in which a display unit is configured by arranging the plurality of display units in a plane.

  In recent years, light-emitting diodes (LEDs) have become mainstream as display elements for large-sized display devices. By arbitrarily designing the arrangement and arrangement pitch of three primary color LEDs, large-scale displays with various resolutions and brightness can be used depending on the application. The device is configured. Recently, an LED called “3in1” has been introduced, in which LED chips of three colors of R, G, and B are built in one LED lamp, compared to a system in which three LEDs of R, G, and B are arranged. Therefore, the three colors can be mixed easily, so that it can be applied even when the viewing distance is short.

  On the other hand, when LEDs are arranged at a high pixel density in order to increase the resolution, the number of elements per unit area increases and the cost increases rapidly. For this reason, a high-resolution large-sized display device uses a high-pixel-density flat display panel such as an organic electroluminescence panel (hereinafter referred to as an organic EL panel) as a display element, and has a plurality of flat display panels. And a method of arranging a plurality of display units has been studied.

  A flat display panel such as an organic EL panel has a non-light-emitting portion such as an electrode lead-out portion or a sealing portion in its peripheral portion. For this reason, when the flat display panel is arranged in a plane, there is a problem that a non-light emitting portion which is a joint is easily noticeable, and this is particularly remarkable in a high-resolution large display device. In order to solve such a problem, in Patent Document 1, when a plurality of organic EL panels are supported by a support, a portion of the non-light-emitting portions of the organic EL panel is overlapped and arranged so that the seam is conspicuous. A difficult structure is realized.

  Further, as a flat display without overlapping the flat display panel, the technical document 1 discloses that the organic EL panel can be reduced by reducing the width of the electrode lead-out portion and the peripheral sealing portion to the limit. A large display device in which panels are arranged without joints is presented.

  Further, Patent Document 2 discloses an EL that has a sufficient size and a sufficient mechanical strength by attaching a large substrate to the light emission side of a plurality of small panels having EL elements via an adhesive layer. A display device is presented. In this example, as a large substrate, a support film having a strength increased by setting the thickness of an antireflection film having a thickness of 200 μm or less to 500 μm or more is used.

Japanese Patent No. 4913323 JP 2001-1000066 A

Z. Hara et al. “The High Performance Scalable Display with Passive OLEDs”, SID 10 DIGEST, pp357-360 (2010)

  In the method of arranging a part of the flat display panel as shown in the above-mentioned Patent Document 1 in an overlapping manner, the generation of a large number of fine steps on the display surface cannot be avoided in terms of structure, and in terms of display quality. It is desirable that there is no step on the display surface. In addition, it is necessary to devise a structure of the support for holding a part of the panel in an overlapping manner, and it is easier in terms of structure to arrange in a plane.

  However, as presented in Technical Document 1, in order to arrange the organic EL panels in a plane, it is necessary to reduce the width of the sealing portion to the limit so that the non-light emitting portion of the joint is not conspicuous. The organic EL panel is formed of a front glass on which a light emitting part is formed and a back glass that covers the light emitting part, and these are bonded together by a sealing part around the panel. For this reason, when the width | variety of the sealing part was narrowed, there existed a problem that the mechanical strength of an organic electroluminescent panel fell. Large display devices are often installed in public places, and ensuring the mechanical strength of the panel is an important issue as a safety measure when an impact is applied to the panel.

  On the other hand, in the EL display device presented in Patent Document 2, since a plurality of small panels are attached to one large substrate to increase the size and have sufficient mechanical strength, the large substrate itself is sufficient. Rigidity and mechanical strength are required. By using such a large substrate, there arises a problem of an increase in thickness and weight and an increase in cost of an EL display device characterized by thin and light weight. Furthermore, there is a problem in that the manufacturing process becomes complicated because a process of uniformly applying an adhesive to the entire attachment surface of the large substrate or the small substrate and the end surface of the small panel and bonding them with high accuracy is required.

  The present invention has been made to solve the above-described problems, and is a large-sized display device configured by arranging a plurality of display units in which a plurality of flat display panels are arranged in a plane. An object of the present invention is to improve the mechanical strength while suppressing an increase in cost and complication of the manufacturing process.

  A large-sized display device according to the present invention has a plurality of flat display panels provided with sealing portions around a pixel portion having a plurality of pixels, and has a common support for a surface opposite to the light emitting side. A large-sized display device comprising a display unit fixed by a member and having a display unit configured by arranging a plurality of display units in a plane, and each display unit is disposed on the surface of the light emission side of the display unit. It has a transparent protective film stuck so as to straddle a plurality of flat display panels included.

  According to the large-sized display device according to the present invention, by adhering a transparent protective film on the light emission side surface of each display unit so as to straddle a plurality of flat display panels included in the display unit, Since the display panels are held together via the transparent protective film, even if the sealing portion of one flat display panel is damaged due to an external impact, the panel can be prevented from peeling off. Moreover, since the transparent protective film is affixed for each display unit, it is not necessary to be a film having a large area corresponding to the display portion of the large display device, and can be obtained at a low cost. Furthermore, since the pasting operation can be easily performed manually, it is possible to improve the mechanical strength while suppressing an increase in cost and complication of the manufacturing process.

It is a figure explaining the large sized display device concerning Embodiment 1 of this invention. It is a perspective view which shows the display unit which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the structure of the display unit which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the structure of the display unit which concerns on Embodiment 2 of this invention. It is a top view which shows the display unit which concerns on Embodiment 2 of this invention. It is a disassembled perspective view which shows the structure of the display unit which concerns on Embodiment 3 of this invention. It is a top view which shows the display unit which concerns on Embodiment 3 of this invention.

Embodiment 1 FIG.
Hereinafter, a large display device according to Embodiment 1 of the present invention will be described with reference to the drawings. 1A and 1B are diagrams for explaining a large display device according to the first embodiment, where FIG. 1A is a perspective view showing the whole, FIG. 1B is a plan view showing a display unit constituting the large display device, and FIG. ) Is a plan view showing a flat display panel constituting the display unit. In the drawing, the same and corresponding parts are denoted by the same reference numerals.

  As shown in FIG. 1A, the large display device 1 includes a display unit 2 and a frame 3, and the display unit 2 includes a plurality of display units 4 arranged in a lattice pattern. Each display unit 4 includes a plurality of organic EL panels 5 which are flat display panels as display elements. As shown in FIG. 1B, the display unit 4 according to the first embodiment is an array of four elongated organic EL panels 5 such that the long sides of the rectangle face each other.

  As shown in FIG. 1C, the organic EL panel 5 having an organic electroluminescence element has a plurality of pixels 6 including at least three primary colors of R, G, and B arranged in a grid pattern to display a full color image. The pixel portion (organic EL light emitting layer) is provided, and a sealing portion 7 is provided around the pixel portion. The front glass on which the light emitting layer of the organic EL panel 5 is formed and the back glass covering the light emitting layer are bonded together by a sealing portion 7 around the panel.

  Next, the display unit 4 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 2, the display unit 4 includes four organic EL panels 5a, 5b, 5c, and 5d (collectively, organic EL panels 5) arranged in a plane. The organic EL panel 5 is provided with a flexible printed circuit board (FPC) 8 which is a film-like member for drawing out the electrode of each panel.

  As shown in FIG. 3, the display unit 4 has a surface opposite to the light emitting side fixed by a plate 9 that is a support member common to the four organic EL panels 5a, 5b, 5c, and 5d. ing. An adhesive or a double-sided tape is used for fixing each organic EL panel 5 and the plate material 9. A drive circuit board 10 on which a drive circuit of the organic EL panel 5 is mounted is provided on the back side of the plate material 9, and each organic EL panel 5 and the drive circuit board 10 are connected via the FPC 8.

  A transparent protective film 11 straddling a plurality of organic EL panels 5 included in the display unit 4 is affixed to the surface on the light emission side of the display unit 4. In the first embodiment, one transparent protective film 11 is attached to the entire area of the light emission side surface of the display unit 4. That is, the transparent protective film 11 straddles all the organic EL panels 5 included in the display unit 4.

  The transparent protective film 11 has an adhesive layer (adhesive layer) on one surface thereof, and the adjacent organic EL panels 5 are held together via the transparent protective film 11. As described above, even if a single organic EL panel 5 is subjected to an impact from the outside by applying the common transparent protective film 11 to the plurality of organic EL panels 5, the sealing portion 7 is damaged. Since the front glass of the panel is held by the transparent protective film 11, it does not peel off. In addition, since the back glass is held by a common plate material 9, even if the sealing portion 7 is damaged, it does not peel off.

  As a main constituent material of the transparent protective film 11, for example, polyethylene terephthalate (PET) is used. A commercially available PET film (for example, Realoc series manufactured by NOF Corporation) can be used. The transparent protective film 11 may have a plurality of layers such as a release film / adhesive layer / PET film / protective film. The thickness is not particularly limited, but a practical thickness of, for example, about 100 μm is used.

  In addition, the transparent protective film 11 needs to have optical characteristics, physical characteristics, and durability that are necessary as members constituting the display unit 2 of the large display device 1. As the optical characteristics, those having a low visibility reflectance and a high total light transmittance are preferable. In addition, physical properties such as adhesion, surface hardness, and adhesive strength, and durability such as heat resistance, moist heat resistance, cold resistance, and the like must satisfy predetermined standards.

  Further, when the large display device 1 is used in a bright environment such as outdoors, a component of specular reflection is generated in the reflection of external light, which affects the image quality. In order to prevent this, it is effective to use the transparent protective film 11 that also serves as an antireflection film. As the antireflection film, an AG (Anti-Glare) film, an AR (Anti-Reflection) film, an AGAR film, or the like is applied. In particular, in a system in which flat display panels such as the organic EL panel 5 are arranged, the individual panels are slightly inclined, and an antireflection film is effective in order to reduce the influence of variations in reflection due to the inclination.

  Moreover, the transparent protective film 11 may have a function of a polarizing plate or a diffusion plate in addition to the function of the antireflection film. One of these functions may be provided, or a plurality of functions may be provided. Specifically, a polarizing plate mainly composed of polyvinyl alcohol and adsorbed and oriented with iodine compound molecules can be employed as the transparent protective film 11. Further, by using a diffusion plate such as a ceramic thin plate, the transparent protective film 11 can have a function of preventing the reflection of the mirror image of the reflection electrode of each organic EL panel 5 from the outside by a light diffusion action.

  When the transparent protective film 11 is attached to the display unit 4, the foreign matter on the light emitting side surface of the display unit 4 is removed and cleaned, and then the display unit 4 is directed from one end to the opposite end. While stretching the transparent protective film 11, it is pasted so that bubbles do not enter.

  Since the size of the organic EL panel 5 in the longitudinal direction is, for example, about 10 cm, and the display unit 4 as a whole is not so large, the transparent protective film 11 can be attached manually (using a squeegee). Is also good). Since the sealing unit 7 having a predetermined width is provided at the end of the display unit 4, the tolerance when the transparent protective film 11 is attached may be within the width of the sealing unit 7.

  As described above, according to the first embodiment, the display unit 4 including the plurality of organic EL panels 5 arranged in a plane is provided, and the display unit 2 is configured by arranging the plurality of display units 4 in a plane. In the large-sized display device 1, a single transparent protective film 11 across all the organic EL panels 5 included in the display unit 4 is attached to the light emission side surface of each display unit 4, and adjacent organic EL panels. Since 5 are held together via the transparent protective film 11, the mechanical strength of the organic EL panel 5 and the display unit 4 can be improved.

  In particular, in the high-resolution large-sized display device 1, since the organic EL panel 5 in which the width of the sealing portion 7 is narrowed so that the non-light-emitting portion that is a joint is not conspicuous, ensuring the safety has been a problem. However, according to this Embodiment 1, even when the sealing part 7 is damaged by the impact from the outside, peeling of a front glass can be prevented with the transparent protective film 11, and safety | security is ensured.

  Moreover, since the transparent protective film 11 is affixed by each display unit 4 unit, it does not need to be a film of a large area corresponding to the display part 2 of the large sized display apparatus 1, and can be obtained cheaply. Furthermore, the pasting operation can be easily performed manually, and the mechanical strength can be improved while suppressing an increase in cost and complication of the manufacturing process.

Embodiment 2. FIG.
FIG. 4 shows a display unit constituting the large display device according to Embodiment 2 of the present invention. 4, the same reference numerals are assigned to the same and corresponding parts as in FIG. In the first embodiment, one transparent protective film 11 straddling all the organic EL panels 5 included in the display unit 4 is attached to the light emission side surface of each display unit 4. In the second aspect, the transparent protective film 11a,... 11d (generally referred to as the transparent protective film 11) having the same width as the width of each region obtained by dividing the light emitting side surface of the display unit 4 into a plurality of regions. ) Is pasted. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

  As shown in FIG. 5, the display unit 4 according to the second embodiment has a plurality of elongated organic EL panels 5 arranged so that the long sides of the rectangles face each other, and the transparent protective films 11 a and 11 b. , 11c and 11d are attached in a direction perpendicular to the longitudinal direction of the organic EL panel 5. At that time, by arranging the joint of the transparent protective film 11 attached to the adjacent region in the non-light emitting portion between the pixels (the inter-pixel gap indicated by A in FIG. 5), the joint is inconspicuous and affects the image quality. Is suppressed. The inter-pixel gap is secured at least twice the width of the sealing portion 7.

  Further, as in the first embodiment, when a single transparent protective film 11 is pasted on the plurality of organic EL panels 5, the transparent protective film is caused by slight inclinations or steps of the individual organic EL panels 5. 11 and the organic EL panel 5 easily enter air bubbles. Therefore, as in the second embodiment, four transparent protective films 11a,... 11d are attached to the four organic EL panels 5 in a direction perpendicular to the longitudinal direction of the organic EL panel 5. By doing so, the invasion of bubbles at the stage of applying the individual transparent protective films 11 is suppressed.

  Also in the second embodiment, since the transparent protective film 11 is pasted so as to straddle all four organic EL panels 5, the machine of the organic EL panel 5 and the display unit 4 is the same as in the first embodiment. The mechanical strength is improved. Furthermore, since the transparent protective film 11 having a smaller width than that of the first embodiment is used, the cost is low and the pasting operation is easy.

Embodiment 3 FIG.
FIG. 6 shows a display unit constituting the large display device according to Embodiment 3 of the present invention. In FIG. 6, the same reference numerals are assigned to the same or corresponding parts as in FIG. In the first embodiment and the second embodiment, one transparent protective film 11 or four transparent protective films 11a,... 11d are pasted over all the organic EL panels 5 included in the display unit 4. Although attached, it does not necessarily need to straddle all the organic EL panels 5, and if it straddles a some panel, there can exist the effect of this invention.

  In the second embodiment, the transparent protective film 11a,... 11d having the same width as the width of the region is attached to each region obtained by dividing the light emitting side surface of the display unit 4 into a plurality of regions. Although the entire area of the light emitting surface is covered, it is possible to improve the mechanical strength without necessarily covering the entire area. In the third embodiment, three transparent protective films 11e, 11f, and 11g are attached to the four organic EL panels 5a, 5b, 5c, and 5d so as to cover the joints at the three locations. is there.

  As shown in FIG. 7, the display unit 4 according to the third embodiment is configured by arranging long and thin rectangular organic EL panels 5 such that the long sides of the rectangle face each other, and the transparent protective films 11e, 11f, 11g is affixed in the direction parallel to the longitudinal direction of the organic EL panel 5 so that it may straddle two adjacent organic EL panels 5 and may cover those seams.

  In the case where a plurality of transparent protective films 11 are attached in a direction parallel to the longitudinal direction of the organic EL panel 5 as in the third embodiment, the entire area of the light emission side surface of the display unit 4 is covered. You may make it cover with the transparent protective film 11. FIG. At that time, as in the second embodiment, by arranging the joint of the transparent protective film 11 attached to the adjacent region in the non-light emitting portion between the pixels, the joint is not conspicuous and the influence on the image quality is suppressed. The

  Also in Embodiment 3, the mechanical strength of the organic EL panel 5 and the display unit 4 can be improved by attaching the transparent protective film 11 so as to cover the adjacent organic EL panels 5 and cover their joints. . Moreover, since it is not necessary to face | match the end surfaces of the adjacent transparent protective film 11, affixing operation | work is easier than the said Embodiment 2. FIG.

  As described above, in the first to third embodiments, the organic EL panel 5 is used as the flat display panel, and the display unit 4 is configured from the four organic EL panels 5, but the present invention is limited to this. is not. As the flat display panel, an organic EL panel, a liquid crystal display panel, and other display devices may be used. Further, the number of flat display panels constituting the display unit 4 is not particularly limited, and the arrangement method can be arbitrarily arranged in the vertical direction, the horizontal direction, or in a lattice shape. Within the scope of the present invention, the present invention can be freely combined with each other, or can be appropriately modified or omitted.

  The present invention can be used in a large display device including a display unit in which a plurality of organic EL panels are arranged in a plane.

1. Large display device, 2 display unit, 3 frame, 4 display unit,
5, 5a, 5b, 5c, 5d organic EL panel (flat display panel),
6 pixels, 7 sealing part, 8 FPC, 9 plate material, 10 drive circuit board,
11, 11a, 11b, 11c, 11d, 11e, 11f, 11g Transparent protective film.

Claims (12)

A plurality of flat display panels provided with sealing portions around a pixel portion having a plurality of pixels are arranged in a plane, and includes a display unit in which a surface opposite to the light emission side is fixed with a common support member, A large display device in which a plurality of display units are arranged in a plane to form a display unit,
Each of the display units has a transparent protective film attached to a surface on the light emission side thereof so as to straddle the plurality of flat display panels included in the display unit.   The large-sized display device according to claim 1, wherein the transparent protective film is attached so as to straddle all the flat display panels included in the display unit.   The large-sized display device according to claim 2, wherein one transparent protective film is attached to all regions on the light emission side surface of the display unit.   3. The transparent protective film having the same width as the width of each of the regions obtained by dividing the light emission side surface of the display unit into a plurality of regions. A large display device as described in 1.   The large-sized display device according to claim 4, wherein a seam of the transparent protective film attached to the adjacent regions is disposed in a non-light emitting portion between the pixels.   The display unit includes a plurality of flat display panels each having an elongated rectangular shape so that the long sides of the rectangles face each other, and the transparent protective film is attached in a direction perpendicular to the longitudinal direction of the flat display panel. The large display device according to claim 1, wherein the large display device is provided.   The display unit includes a plurality of flat display panels each having a long and narrow rectangular shape so that the long sides of the rectangles face each other, and the transparent protective film extends over the adjacent flat display panels and covers their joints. The large display device according to claim 1, wherein the large display device is attached in a direction parallel to a longitudinal direction of the flat display panel.   The large-sized display device according to any one of claims 1 to 7, wherein the transparent protective film has an adhesive layer on one surface thereof.   The large-sized display device according to any one of claims 1 to 8, wherein the transparent protective film has a function of an antireflection film.   The large-sized display device according to claim 1, wherein the transparent protective film has a function of a polarizing plate.   The large-sized display device according to any one of claims 1 to 10, wherein the transparent protective film has a function of a diffusion plate.   The large-sized display device according to any one of claims 1 to 11, wherein the flat display panel includes an organic electroluminescence element.