JP2005071944A - Organic EL display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL display device having a good appearance using a plurality of organic EL panels.
A case body 40 includes a first window 41A corresponding to a first organic EL panel 21A and a second window 41B corresponding to a second organic EL panel 21B. The EL panel 21A and the second organic EL panel 21B are accommodated. A circularly polarizing member 44 is provided so as to cover the first window portion 41A and the second window portion 41B. A reflective member 45 is provided around at least the first window portion 41A and the second window portion 41b on the rear side of the circularly polarizing member 44.
[Selection] Figure 1

Description

  The present invention relates to an organic EL display device including an organic EL panel in which a laminate in which an organic layer having at least a light emitting layer is sandwiched between a first electrode and a second electrode is formed on a substrate.

  Conventionally, various organic EL panels have been proposed, and disclosed in, for example, Patent Document 1 and Patent Document 2. The organic EL panel 1 is obtained by forming a laminated body 3 on a glass substrate 2, and this laminated body 3 has a transparent electrode 4, an insulating layer 5, an organic layer 6, and a back electrode 7 (see FIG. 5). The organic layer 6 includes a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer, and is sandwiched between the transparent electrode 4 and the back electrode 7. The laminate 3 is covered with a sealing glass 8, and the sealing glass 8 is bonded to the glass substrate 2 with an adhesive 9.

The transparent electrode 4 has an anode part 4a and a cathode terminal part 4b. The back electrode 7 is electrically connected to the cathode terminal portion 4b. In the organic EL panel 1, the light emitting portion P shines by connecting a power source to the anode portion 4a and the cathode terminal portion 4b.
JP 2001-267066 A Japanese Patent Laid-Open No. 9-127858

A circularly polarizing plate 12 including a linearly polarizing plate 10 and a birefringent plate 11 is attached to the front surface of the organic EL panel 1. The circularly polarizing plate 12 is provided to improve the contrast ratio of the display light of the organic EL panel 1 (see, for example, Patent Document 2).
The circularly polarizing plate 12 will be described in detail with reference to FIGS. The circularly polarizing plate 12 is composed of a linearly polarizing plate 10 having a polarizing axis 10A and a birefringent plate 11 having a slow axis 11A.

  The outside light a1 passes through the linearly polarizing plate 10 to become linearly polarized light a2, and further passes through the birefringent plate 12 to become right circularly polarized light a3. Then, it is reflected forward by the back electrode 7 of the organic EL panel 1 to become left circularly polarized light a4, passes through the birefringent plate 11 and becomes linearly polarized light a5. Since the linearly polarized light a5 is orthogonal to the polarization axis 10A, it cannot pass through the linearly polarizing plate 10. Therefore, even if the external light a1 enters the organic EL panel 1 and is reflected by the back electrode 7, it is blocked by the linear polarizing plate 10 (see FIG. 4). The display light passes through the linear polarizing plate 10 and becomes linearly polarized light a6 (see FIG. 5). Thus, the display light can pass through the linear polarizing plate 10, but the external light reflected by the back electrode 7 of the organic EL panel 1 does not pass through the linear polarizing plate 10, so that the display contrast ratio of the organic EL panel 1 is high. Become good. The birefringent plate 11 may be referred to as a quarter wavelength plate.

  8 and 9 show an organic EL display device in which a plurality of organic EL panels 1A to 1E are accommodated in a case body 14. FIG. The case body 14 houses five organic EL panels 1A to 1E, a drive circuit board 16 on which a driver circuit 15 for driving these organic EL panels 1A to 1E is mounted, and a main circuit board 17. Yes. Window portions 18A to 18E corresponding to the organic EL panels 1A to 1E are formed in the case body 14, respectively.

However, there is a step D between the circularly polarizing plate 12 attached to each of the organic EL panels 1A to 1E and the front surface 14a of the case body 14, and the color tone of the circularly polarizing plate 12 and the front surface 14a is different. The appearance of the organic EL display device as viewed from the front is not always preferable. In order to solve this problem, it is conceivable to use one large organic EL panel. However, since such a large organic EL panel is expensive, there is a problem that an organic EL device cannot be provided at a low cost. It was.
The present invention provides an organic EL display device that uses a plurality of organic EL panels and has a good appearance.

  As described in claim 1, the present invention is provided so as to cover the first organic EL panel, the second organic EL panel, the first organic EL panel, and the second organic EL panel. And a circularly polarizing member.

  Further, according to the present invention, as described in claim 2, a reflective member is provided around at least the first organic EL panel and the second organic EL panel on the rear side of the circularly polarizing member.

  Further, according to the present invention, the first organic EL panel, the second organic EL panel, the first window portion corresponding to the first organic EL panel, and the second organic EL panel are provided. A case body having a second window portion corresponding to the organic EL panel and accommodating the first organic EL panel and the second organic EL panel, and at least the first window portion and the second window And a circularly polarizing member provided so as to cover the part.

  According to a fourth aspect of the present invention, a reflecting member is provided around at least the first window portion and the second window portion on the rear side of the circularly polarizing member.

  Moreover, this invention provides the translucent board | substrate with which the said circularly-polarizing member is stuck on the front surface, and the said reflection member is stuck on the rear surface, as described in Claim 5.

  Although a plurality of organic EL panels are used, the display by each organic EL panel has a sense of unity, and the appearance of the organic EL display device is improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

Reference numerals 21 </ b> A to 21 </ b> E denote organic EL panels in which a laminate 23 is formed on a translucent substrate 22. The laminate 23 has a first electrode 24, an organic layer 25, and a second electrode 26 (see FIG. 2). The transparent electrode 24 is made of ITO (Indium) which is a mixture of indium oxide (In ₂ O ₃ ) and tin oxide (SnO ₂ ).
Tin Oxide) and is formed by means such as sputtering or vapor deposition.

  The organic layer 25 includes a hole injection layer 25a, a hole transport layer 25b, a light emitting layer 25c, and an electron transport layer 25d (see FIG. 3). The organic layer 25 only needs to have at least the light emitting layer 25c, but the emission luminance can be improved by providing the hole injection layer 25a, the hole transport layer 25b, and the electron transport layer 25d as in this embodiment. Can do. The second electrode 26 is made of aluminum (Al), and is formed on the organic layer 25 by means such as vapor deposition. Reference numeral 27 denotes a sealing glass, and the sealing glass 27 is bonded to the translucent substrate 22 so as to cover at least the organic layer 25 and the second electrode 26.

Reference numeral 28 denotes a flexible wiring board. One end of the flexible wiring board 28 is electrically connected to the organic EL panels 21A to 21E, and the other end is electrically connected to a drive circuit board described later. The flexible wiring board 28 has a flexible substrate 29 made of polyimide and a conductive portion 30 made of copper foil formed on the flexible substrate 29.
Reference numeral 32 denotes a drive circuit board, and a driver circuit 33 for driving the organic EL panel 21 is mounted on the drive circuit board 32. The drive circuit board 32 is obtained by forming a wiring pattern 35 made of copper foil on a hard board 34 made of glass epoxy resin.

  Reference numeral 37 denotes a main circuit board, and the main circuit board 37 is electrically connected to the drive circuit board 32 by a wiring cord 38. Reference numeral 40 denotes a case body, in which the organic EL panels 21A to 21E, the drive circuit board 32, and the main circuit board 37 are accommodated. On the front side of the case body 40, rectangular window portions 41A to 41E respectively corresponding to the organic EL panels 21A to 21E are formed.

  Reference numeral 43 denotes a translucent substrate made of a translucent resin such as polycarbonate, and the translucent substrate 43 is attached to the front surface of the case body 40 via a reflection plate described later. Reference numeral 44 denotes a circularly polarizing plate, and the circularly polarizing plate 44 is attached to the front surface of the translucent substrate 43. The circularly polarizing plate 44 has a linearly polarizing plate and a birefringent plate. Reference numeral 45 denotes a reflecting plate, and the reflecting plate 45 is attached to the rear surface of the translucent substrate 43. The reflection plate 45 is formed with a rectangular opening 45 that is slightly smaller than the windows 41A to 41E.

  According to this embodiment, the front surface side of the case body 40 is covered with the circularly polarizing plate 44, the color tone in the front view of the organic EL display device is uniform, and the front surface of the case body 40 and the organic EL panel The level difference with 21A-21E is not conspicuous. Although the reflection plate 45 may not be provided, when the reflection plate 45 is provided, when the external light is incident, the reflection plate 45 causes the external light to be emitted similarly to the second electrode 26 of the organic EL panels 21A to 21E. Since it reflects, the appearance improves further. Moreover, although the reflective member of this embodiment was the reflective plate 45, the reflective layer formed by vapor deposition on the rear surface of the translucent board | substrate 43, for example may be sufficient.

Sectional drawing which shows embodiment of this invention. The principal part expanded sectional view which shows embodiment same as the above. The expanded sectional view of the organic layer which shows embodiment same as the above. The front view which shows embodiment same as the above. Sectional drawing of the organic electroluminescent panel which shows a prior art example. Explanatory drawing of the circularly-polarizing plate which shows a prior art example same as the above. Explanatory drawing of the circularly-polarizing plate which shows a prior art example same as the above. Sectional drawing which shows another prior art example. The front view which shows another prior art example same as the above.

Explanation of symbols

21A-21E Organic EL panel
40 Case body 41A-41E Window part
43 Translucent substrate
44 Circularly polarizing plates (circularly polarizing members)
45 Reflector (reflective member)

Claims (5)

  A first organic EL panel, a second organic EL panel, and a circularly polarizing member provided so as to cover the first organic EL panel and the second organic EL panel Organic EL display device.   The organic EL display device according to claim 1, wherein a reflective member is provided around at least the first organic EL panel and the second organic EL panel on the rear side of the circularly polarizing member.   A first organic EL panel, a second organic EL panel, a first window corresponding to the first organic EL panel, and a second window corresponding to the second organic EL panel A case body that accommodates the first organic EL panel and the second organic EL panel, and a circularly polarizing member that is provided so as to cover at least the first window portion and the second window portion. An organic EL display device characterized by that.   The organic EL display device according to claim 3, wherein a reflective member is provided around at least the first window portion and the second window portion on the rear side of the circularly polarizing member.   5. The organic EL display device according to claim 2, further comprising a translucent substrate on which the circularly polarizing member is attached to the front surface and the reflective member is attached to the rear surface.

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