JP5821955B2 - Organic EL lighting equipment - Google Patents

Description

  The present invention relates to an organic EL lighting device, and particularly relates to an organic EL lighting device including a plurality of organic EL panels arranged in a planar shape.

  As disclosed in Japanese Patent Application Laid-Open No. 2009-164022 (Patent Document 1), a lighting fixture including a plurality of organic EL (Organic Electro Luminescence) panels as a light emitting element is known. In such a lighting fixture, a planar light-emitting portion is formed by arranging a plurality of organic EL panels in a planar shape (including a planar shape and a curved shape).

  The planar light emitting portion constitutes a so-called surface light source that emits light from the entire surface. Unlike surface light sources such as incandescent lamps and LEDs (Light Emitting Diodes), and linear light sources such as fluorescent lamps, surface light sources can produce soft illumination with reduced brightness, so high-quality applications Suitable for Moreover, since the lighting fixture provided with such a surface light source can comprise the light emission part thinly, it can also attain space saving.

JP 2009-164022 A

  An object of the present invention is to provide an organic EL lighting apparatus including a plurality of organic EL panels arranged in a planar shape, and capable of extending the life of each organic EL panel. And

  The organic EL lighting fixture based on this invention is equipped with the light emission part by which the some organic EL panel was arranged in planar shape, and the degree of the density | concentration of the said several organic EL panel in the said light emission part is on the outer peripheral side in the said light emission part. In comparison, the center side in the light emitting part is smaller.

The plurality of organic EL panels arranged on the outer peripheral side in the light emitting unit are arranged annularly at the same interval on the outer peripheral side in the light emitting unit, and the plurality of organic EL panels arranged on the center side in the light emitting unit Are arranged annularly at the same interval inside the plurality of organic EL panels arranged on the outer peripheral side in the light emitting part, and the two adjacent organic elements among the plurality arranged on the outer peripheral side in the light emitting part When the value of the interval between the EL panels is defined as the interval D1, and the value of the interval between the two adjacent organic EL panels among the plurality arranged on the center side in the light emitting unit is defined as the interval D2, the light emission The interval D2 between the plurality of organic EL panels arranged on the center side in the unit is wider than the interval D1 between the plurality of organic EL panels arranged on the outer peripheral side in the light emitting unit, and is within the light emitting unit. One organic EL panel arranged on the center side, and one of the plurality of organic EL panels arranged on the outer peripheral side in the light emitting unit located closest to the one organic EL panel The same interval as the interval D2 is provided between them .

Preferably, the degree of density of the plurality of organic EL panels in the light emitting unit is determined so that the temperature distribution is substantially uniform between the outer peripheral side in the light emitting unit and the central side in the light emitting unit .

Preferably, the light emitting unit is formed by attaching a plurality of the organic EL panels arranged in a planar shape to a casing, and the casing functions as a heat radiator of the plurality of organic EL panels .

  ADVANTAGE OF THE INVENTION According to this invention, it is an organic EL lighting fixture provided with the some organic EL panel arranged in planar shape, Comprising: Obtaining the organic EL lighting fixture which can aim at the lifetime improvement of each organic EL panel can be obtained. It becomes possible.

It is a top view which shows the organic EL lighting fixture in the comparative example regarding this invention. It is arrow sectional drawing along the II-II line | wire in FIG. It is a top view which shows the temperature distribution in the light emission part at the time of making the organic EL lighting fixture in the comparative example regarding this invention light continuously for a predetermined time. It is a figure which shows the correlation of the temperature of an organic EL panel at the time of operation | movement of an organic EL panel, and the lifetime (time) of an organic EL panel. 1 is a first plan view showing an organic EL lighting fixture in Embodiment 1. FIG. FIG. 3 is a second plan view showing the organic EL lighting device in the first embodiment. It is a top view which shows the temperature distribution in the light emission part at the time of making the organic EL lighting fixture in Embodiment 1 light continuously for a predetermined time. 6 is a plan view showing an organic EL lighting apparatus in Embodiment 2. FIG. It is a top view which shows the temperature distribution in the light emission part at the time of making the organic EL lighting fixture in Embodiment 2 light continuously for a predetermined time. FIG. 10 is a plan view showing an organic EL lighting device in a modification of the second embodiment.

[Comparative example]
Before describing each embodiment based on this invention, the comparative example regarding this invention is demonstrated referring drawings below. FIG. 1 is a plan view showing an organic EL lighting apparatus 100 in this comparative example. FIG. 2 is a cross-sectional view taken along line II-II in FIG.

  As shown in FIGS. 1 and 2, an organic EL lighting apparatus 100 includes a light emitting unit 10 configured by arranging a plurality of organic EL panels 1 in a plane and a plurality of organic EL panels 1 on a ceiling (see FIG. 1). A housing 20 for fixing to a wall surface (not shown) or the like, and a drive circuit (not shown) for supplying a current to each of the plurality of organic EL panels 1.

  A plurality of organic EL panels 1 having substantially the same area are arranged in a so-called matrix of 5 × 5. A space D1 is provided between adjacent organic EL panels 1 in both the row direction (left and right direction in FIG. 1) and the column direction (up and down direction in FIG. 1).

  The plurality of organic EL panels 1 are attached to the housing 20. When the plurality of organic EL panels 1 emit light, heat generated in the plurality of organic EL panels 1 is transmitted to the housing 20. The housing 20 functions as a heat radiator for the plurality of organic EL panels 1.

  In some cases, the area occupied by the light emitting unit 10 is relatively large with respect to the housing 20. The organic EL panel 1 disposed on the outer peripheral side in the light emitting unit 10 has a limited number of organic EL panels disposed on the periphery thereof, and thus is not easily heated due to the heat dissipation action of the housing 20.

  On the other hand, the periphery of the organic EL panel 1 disposed on the center side in the light emitting unit 10 is surrounded by other organic EL panels 1.

  The heat dissipation action by the housing 20 on the organic EL panel 1 is such that the organic EL panel 1 arranged on the center side in the light emitting unit 10 is compared with the organic EL panel 1 arranged on the outer peripheral side in the light emitting unit 10. Low. In the case where the interval D1 between the plurality of organic EL panels 1 is configured to be narrow, the heat dissipation efficiency in the organic EL panel 1 disposed on the center side in the light emitting unit 10 is further reduced.

  FIG. 3 is a plan view showing a temperature distribution in the light emitting unit 10 when the organic EL lighting apparatus 100 is continuously turned on for a predetermined time. With reference to FIG. 3, in the organic EL lighting apparatus 100, a difference in heat dissipation efficiency occurs between the plurality of organic EL panels 1. Due to this difference in heat dissipation efficiency, the vicinity of the boundary line Rc between the organic EL panel 1 (1c) located on the most central side in the light emitting unit 10 and the organic EL panel 1 (1b) located on the outer periphery thereof In the case, a temperature rise of, for example, + 15 ° C. occurs with respect to the ambient environmental temperature.

  In the vicinity of the boundary line Rb between the organic EL panel 1 (1b) and the organic EL panel 1 (1a) located on the outer peripheral side thereof, a temperature increase of, for example, + 10 ° C. occurs with respect to the ambient environmental temperature. In the vicinity of the boundary line Ra located outside the organic EL panel 1 (1a), a temperature increase of, for example, + 5 ° C. occurs with respect to the ambient environmental temperature.

  Thus, the heat dissipation efficiency near the organic EL panel 1 (1b) is lower than the heat dissipation efficiency of the organic EL panel 1 (1a), and the heat dissipation efficiency near the organic EL panel 1 (1c) is lower than the organic EL panel 1 (1b). As a result, the temperature on the center side of the light emitting unit 10 becomes higher than the temperature on the outer peripheral side of the light emitting unit 10.

  The organic EL panel is composed of an organic material, and the organic material is deteriorated due to various factors. In general, the following correlation exists between the temperature of the organic EL panel during the operation of the organic EL panel and the useful life (time) of the organic EL panel.

  FIG. 4 is a diagram showing a correlation L10 between the temperature of the organic EL panel during the operation of the organic EL panel and the useful life (time) of the organic EL panel. The lifetime (time) of the organic EL panel in FIG. 4 is reduced to a predetermined luminance (for example, 70% or 50%) as compared with the initial state when a constant current is applied to the organic EL panel. Means the time until.

  In FIG. 4, when the lifetime of the organic EL panel at the temperature T during the operation of the organic EL panel is L (T), L (T1) = L1, L (T2) = L2, and L (T3) = L3. Assuming that T1 + 5 ° C. = T2 and T2 + 5 ° C. = T3, for example, L1 × 0.8 = L2 and L2 × 0.8 = L3. In this case, when the temperature of the organic EL panel during the operation of the organic EL panel is increased by 5 ° C., the useful life is reduced by a factor of 0.8.

  As described above, in the organic EL lighting apparatus 100 shown in FIG. 3, the organic EL panel 1 (1 b) located on the inner side of the organic EL panel 1 (1 a) located on the outermost peripheral side is compared with the organic EL panel 1 (1 b) located on the innermost side. A temperature increase of + 5 ° C. occurs. As a result, the lifetime of the organic EL panel 1 (1b) positioned on the inner side of the organic EL panel 1 (1a) positioned on the outermost peripheral side is 0.8 times as long as the lifetime.

  Compared to the organic EL panel 1 (1a) located on the outermost peripheral side, the organic EL panel 1 (1c) located on the two inner sides (the central side as the light emitting unit 10) has a temperature increase of + 10 ° C. Arise. As a result, compared with the organic EL panel 1 (1a) located on the outermost peripheral side, the organic EL panel 1 (1c) located on the two inner sides has a lifetime of 0.64 times (= 0.8 times × 0.8 times). Thus, the lifetime of the organic EL panel arranged on the center side is shortened.

  The organic EL lighting apparatus 100 may be configured such that each organic EL panel 1 cannot be easily removed from the housing 20. In this case, although the organic EL panels 1 (1a) and 1 (1b) have not reached the end of their useful life, the overall useful life of the organic EL lighting apparatus 100 is rate-determined by the organic EL panel 1 (1c). As a result, the useful life of the organic EL lighting apparatus 100 is shortened. Even when the organic EL lighting apparatus 100 is configured such that each organic EL panel 1 can be removed from the housing 20, it is necessary to frequently replace only the organic EL panel 1 (1c).

[Embodiment]
Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the description of each embodiment, when referring to the number, amount, or the like, the scope of the present invention is not necessarily limited to the number, amount, or the like unless otherwise specified. In the description of each embodiment, the same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated. Unless there is a restriction | limiting in particular, it is planned from the beginning to use suitably combining the structure shown in each embodiment.

[Embodiment 1]
With reference to FIG. 5 and FIG. 6, the organic EL lighting fixture 101 in this Embodiment is demonstrated. FIG. 5 is a first plan view showing the organic EL lighting fixture 101. FIG. 6 is a second plan view showing the organic EL lighting fixture 101.

  As shown in FIG. 5, the organic EL lighting apparatus 101 includes a light emitting unit 10 configured by arranging a plurality of organic EL panels 1 in a planar shape, and a plurality of organic EL panels 1 on a ceiling (not shown). Or the housing | casing 20 for fixing to a wall surface (not shown) etc., and the drive circuit (not shown) which supplies an electric current to each of the some organic EL panel 1 are provided.

  In the organic EL lighting fixture 101 in the present embodiment, 20 organic EL panels 1 having substantially the same area are used. Specifically, 16 organic EL panels 1 (1 a) are arranged in a ring shape on the outer peripheral side in the light emitting unit 10. A space D1 is provided between the adjacent organic EL panels 1 (1a) in both the horizontal direction (left and right direction in FIG. 5) and the vertical direction (up and down direction in FIG. 5).

  The four organic EL panels 1 (1 b) are annularly arranged inside the organic EL panel 1 (1 a) in the light emitting unit 10. The four organic EL panels 1 (1 a) are located on the center side in the light emitting unit 10. A space D2 is provided between the adjacent organic EL panels 1 (1b) both in the horizontal direction (left and right direction in FIG. 5) and in the vertical direction (up and down direction in FIG. 5). Further, a distance D2 is also provided between the organic EL panel 1 (1b) and the organic EL panel 1 (1a) closest to the organic EL panel 1 (1b). The interval D2 is wider than the interval D1.

  The plurality of organic EL panels 1 are attached to the housing 20. When the plurality of organic EL panels 1 emit light, heat generated in the plurality of organic EL panels 1 is transmitted to the housing 20. The housing 20 functions as a heat radiator for the plurality of organic EL panels 1.

  Referring to FIG. 6, in organic EL lighting apparatus 101, each of the plurality of organic EL panels 1 is arranged as described above, whereby the degree of congestion of the plurality of organic EL panels 1 in light emitting unit 10 ( The density is smaller on the central side in the light emitting unit 10 than on the outer peripheral side in the light emitting unit 10.

  Specifically, it is assumed that the light emitting unit 10 is divided into an outer peripheral side light emitting unit 10a and a central side light emitting unit 10b. The area of one organic EL panel 1 is assumed to be (W1 × W1). If the area of the center side light emitting unit 10b is (Wb × Wb), the area of the outer peripheral side light emitting unit 10a is (Wa × Wa−Wb × Wb).

  In this case, the density of the outer peripheral side light emitting unit 10a is expressed by (W1 × W1) × 16 sheets / [(Wa × Wa−Wb × Wb)]. The density of the central light emitting unit 10b is represented by (W1 × W1) × 4 / (Wb × Wb). Each of the above dimensions is designed so that (the density in the outer peripheral side light emitting part 10a)> (the density in the central side light emitting part 10b) is established.

  In the present embodiment, for example, if W1 = 12 cm, Wa = 80 cm, and Wb = 40 cm, the density on the outer peripheral side light emitting unit 10a is 48% and the density on the central side light emitting unit 10b is 36 from the above formula. %. The relationship of (the density in the outer peripheral side light emitting part 10a)> (the density in the central light emitting part 10b) is satisfied. In this case, the distance D1 in FIG. 5 is about 3.5 cm, and the distance D2 in FIG. 5 is about 8.3 cm. FIG. 7 is a plan view showing a temperature distribution in the light emitting unit 10 when the organic EL lighting fixture 101 is continuously turned on for a predetermined time. As shown in FIG. 7, according to the organic EL lighting apparatus 101, the heat dissipation efficiency around each organic EL panel 1 (1 b) is improved on the center side in the light emitting unit 10. Since a local temperature rise on the center side in the light emitting unit 10 is suppressed, a substantially uniform temperature distribution is formed as a whole in the region Rd.

  Therefore, the variation in the service life of each organic EL panel 1 is alleviated, and it is possible to extend the life of each organic EL panel 1 as a whole. The lifetime of the organic EL lighting fixture 101 as a whole is not limited by the expiration of the lifetime of some of the organic EL panels 1, and it is not necessary to frequently replace only some of the organic EL panels 1. .

[Embodiment 2]
With reference to FIG. 8, the organic EL lighting fixture 102 in this Embodiment is demonstrated. FIG. 8 is a plan view showing the organic EL lighting fixture 102.

  As shown in FIG. 8, the organic EL lighting fixture 102 includes a light emitting unit 10 configured by arranging a plurality of organic EL panels 1 in a planar shape, and a plurality of organic EL panels 1 on a ceiling (not shown). Or the housing | casing 20 for fixing to a wall surface (not shown) etc., and the drive circuit (not shown) which supplies an electric current to each of the some organic EL panel 1 are provided.

  The light emitting unit 10 in the present embodiment includes an organic EL panel placement area A1 where the organic EL panel 1 is provided and an organic EL panel non-placement area A2 where the organic EL panel 1 is not provided. Each organic EL panel disposition area A1 and each organic EL panel non-disposition area A2 are arranged with a distance D1 between them and arranged side by side along the matrix direction as a whole (in a so-called matrix form). The Furthermore, in the center side in the light emission part 10 in this Embodiment, several organic EL panel arrangement | positioning area | region A1 and organic EL panel non-arrangement area | region A2 are arranged in zigzag form.

  Also in the organic EL lighting fixture 102, each of the plurality of organic EL panels 1 is arranged as described above, so that the degree of density (density) of the plurality of organic EL panels 1 in the light emitting unit 10 is increased. Compared to the outer peripheral side in 10, the center side in the light emitting unit 10 is smaller.

  FIG. 8 is a plan view showing a temperature distribution in the light emitting unit 10 when the organic EL lighting fixture 102 is continuously turned on for a predetermined time. As shown in FIG. 8, according to the organic EL lighting fixture 102, the heat dissipation efficiency around each organic EL panel 1 (1 b) is improved on the center side in the light emitting unit 10. Since a local temperature rise on the center side in the light emitting unit 10 is suppressed, a substantially uniform temperature distribution is formed as a whole in the region Rd.

  Therefore, the variation in the service life of each organic EL panel 1 is alleviated, and it is possible to extend the life of each organic EL panel 1 as a whole. Further, in the organic EL lighting fixture 102, each organic EL panel placement area A1 and each organic EL panel non-placement area A2 are arranged with a distance D1 from each other, and as a whole along the matrix direction. Arranged side by side. According to this configuration, it is possible to improve design and production efficiency, and manufacturing costs can be reduced.

  Moreover, you may provide organic electroluminescent panel non-arrangement area | region A2 only in the center of the light emission part 10 like the organic EL lighting fixture 102a shown in FIG. In this case, it is also possible to improve the light emission luminance as the lighting device.

  As mentioned above, although each embodiment based on this invention was described, each embodiment disclosed this time is an illustration and restrictive at no points. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1, 1a, 1b, 1c Organic EL panel, 10 Light emitting part, 10a Outer peripheral side light emitting part, 10b Central side light emitting part, 20 housing, 100, 101, 102, 102a Lighting fixture, A1 Organic EL panel installation area, A2 Organic EL panel non-arrangement area.

Claims (3)

A plurality of organic EL panels are provided with a light emitting unit arranged in a plane,
The degree of confluence of the plurality of the organic EL panel in the light emitting part, towards the center side of the outer peripheral side the inner light emitting portion than the inside the light emitting portion is rather small,
The plurality of organic EL panels arranged on the outer peripheral side in the light emitting part are annularly arranged at the same interval on the outer peripheral side in the light emitting part,
The plurality of organic EL panels arranged on the center side in the light emitting unit are annularly arranged at the same interval inside the plurality of organic EL panels arranged on the outer peripheral side in the light emitting unit,
A value of a distance between two adjacent organic EL panels among a plurality of the plurality of organic EL panels arranged on the outer peripheral side in the light emitting part is defined as a distance D1.
When the value of the interval between the two adjacent organic EL panels among the plurality of organic EL panels arranged on the center side in the light emitting unit is defined as the interval D2,
The interval D2 between the plurality of organic EL panels arranged on the center side in the light emitting unit is wider than the interval D1 between the plurality of organic EL panels arranged on the outer peripheral side in the light emitting unit,
One organic EL panel arranged on the center side in the light emitting part, and one of the plurality of organic EL panels arranged on the outer peripheral side in the light emitting part located closest to the one organic EL panel The same distance as the distance D2 is provided between the EL panel and the EL panel.
Organic EL lighting equipment. The degree of density of the plurality of organic EL panels in the light emitting part is determined so that the temperature distribution is substantially uniform between the outer peripheral side in the light emitting part and the central side in the light emitting part.
The organic EL lighting fixture according to claim 1. The light emitting unit is formed by attaching a plurality of the organic EL panels arranged in a planar shape to a housing,
The housing functions as a heat radiator of the plurality of organic EL panels.
The organic EL lighting fixture according to claim 1 or 2 .

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