JP2016152148A - Organic el panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL panel having a structure that can suppress occurrence of breaking of wire even when a protrusion portion of adhesive agent exists.SOLUTION: Adhesive agent protrudes from the bottom surface of a sealing member 13 constituting an organic EL panel although it protrudes just slightly. The protrusion length of the protrusion portion 11 of the adhesive agent is about 0.3 mm. When the length La of a site of an anode wire 12 which is overlapped with the protrusion portion 11 of the adhesive agent is long as shown in Fig.(a), a wire breaking trouble occurs. However, when the length Lb of the site of the anode wire 12 which is overlapped with the protrusion portion 11 of the adhesive agent is short as shown n Fig. (b), no wire breaking trouble occurs. Furthermore, when the length Lc of the site of the anode wire 12 which is overlapped with the protrusion portion 11 of the adhesive agent is further shortened as shown in Fig.(c), the breaking trouble never occurs.EFFECT: The organic EL panel can be configured in large scale because the wire breaking trouble can be avoided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an organic EL panel, and more particularly to improvement of the wiring structure thereof.

Emits light when a voltage is applied to certain organic compounds. A panel using such a light-emitting organic material as a light source is called an organic EL (Electro Luminescence) panel.
Various structures of organic EL panels have been proposed (see, for example, Patent Document 1 (FIGS. 1 and 4)).

FIGS. 4 and 1 of Patent Document 1 are shown again in FIGS. 8 and 9. The code was re-assigned.
As shown in FIG. 8 (corresponding to a sectional view taken along line 8-8 in FIG. 9 described later), the organic EL panel 100 includes a support substrate 101 and an organic layer including at least an organic light emitting layer provided on the support substrate 101. A light-emitting display portion 105 having a pair of electrodes 103 and 104 sandwiched between them, a sealing member 107 attached to the support substrate 101 with an adhesive layer 106 to cover the light-emitting display portion 105 and forming a sealed space, and a support substrate The main element is a circularly polarizing plate 108 attached to 101.

The electrodes 103 and 104 are each formed in a plurality of lines and are orthogonal to each other. The light-emitting display unit 105 is a so-called passive matrix light-emitting display unit including a plurality of light-emitting pixels (organic EL elements) having portions where the electrodes 103 and 104 are orthogonal and sandwich the organic layer 102.
When a voltage is applied between the electrodes 103 and 104, electrons and holes are combined in the organic layer 102, and the plurality of light emitting pixels emit light, pass through the support substrate 101 and the circularly polarizing plate 108, and display light. 109 is emitted.

  FIG. 9 is a perspective view of the sealing member 107 shown in FIG. 9-9, that is, a perspective view of the sealing member 107. The sealing member 107 and the driver IC 111 are attached to the rectangular support substrate 101. 105 is incorporated. A plurality of anode lines 112 and a plurality of cathode lines 113 extend from the driver IC 111 to the light emitting display unit 105.

When the sealing member 107 of FIG. 9 is made opaque, FIG. 10 is obtained.
As shown in FIG. 10, the anode wiring 112 and the cathode wiring 113 penetrate the adhesive layer (FIG. 8, reference numeral 106) and reach from the outside into the sealing member 107, and the anode (electrode 103) and cathode (electrode 104). Connected.

An enlarged view of part 11 of FIG. 10 is shown in FIG. 8 slightly protrudes from the bottom surface of the sealing member 107.
As shown in FIG. 11, an adhesive protruding portion 114 is formed. The length (width) L1 of the protruding portion of the adhesive is about 0.3 mm.
The adhesive protruding portion 114 covers the anode wiring 112. When viewed from the anode wiring 112, the anode wiring 112 penetrates the adhesive protruding portion 114.

  In the COG (Chip On Glass) type organic EL panel shown in FIG. 10, the IC output is wired at the shortest distance in a portion other than the center portion of the plurality of anodes (electrodes 103) formed. As a result, as shown in FIG. 11, the anode wiring 112 that connects the driver IC 111 and the anode is inclined substantially horizontally, and the length L2 that overlaps the protruding portion 114 of the adhesive also increases.

  When the panel length L3 shown in FIG. 9 is increased in accordance with the demand for an increase in size, a disconnection trouble may occur in the anode wiring 112. That is, the disconnection trouble is one of the factors hindering the increase in size, and it has become necessary to solve the disconnection trouble in response to the demand for increasing the size of the organic EL panel.

JP 2014-78611 A

  An object of the present invention is to provide an organic EL panel having a structure in which occurrence of disconnection is suppressed.

The present inventors created the test materials shown in FIGS.
That is, in FIG. 1A, the anode wiring 12 overlaps the adhesive protruding portion 11 by a sufficiently long La. The angle αa with the side of the sealing member 13 is sufficiently small.
In FIG. 1B, the angle αb with the side of the sealing member 13 is larger than the angle αa, and the anode wiring 12 overlaps the adhesive protruding portion 11 by the length Lb.
In FIG. 1C, the angle αc with the side of the sealing member 13 is 90 °, and the anode wiring 12 overlaps the adhesive protruding portion 11 by a length Lc. This length Lc is equal to the length of the adhesive protruding portion 11 (the length L1 of the adhesive protruding portion 114 shown in FIG. 11).

  In order to specify the size of the organic EL panel 100, the nearest distance from the driver IC 111 to the light emitting display unit 105 shown in FIG. 10 is L5, and the distance from the center of the driver IC 111 to the left end of the light emitting display unit 105 is L6. .

  Table 1 below shows the forms of the test materials (a), (b), and (c) and the test results of the thermal shock test applied to the test materials (a), (b), and (c).

  That is, the sample material (a) is a large organic EL panel having 256 horizontal dots, a distance L5 of 4 mm, and a distance L6 of 33 mm. In the test material (a), the length La (see FIG. 1A) of the anode wiring under the protruding portion of the adhesive was set to 3.0 mm.

  The specimen (a) was subjected to a thermal shock test for 1500 hours. In the thermal shock test, the test material (a) was held in an environment of −40 ° C. for 30 minutes, transferred to + 85 ° C. in 1 minute, and held in an environment of + 85 ° C. for 29 minutes as one cycle. Repeated for 1500 hours.

  When the test material (a) after 1500 hours was energized, an unlit part occurred. When the anode wiring connected to the unlit portion was observed with an electron microscope, disconnection was observed under the protruding portion of the adhesive. Therefore, the evaluation of the specimen (a) is x.

  Next, the test material (b) is a medium-sized organic EL panel having 128 horizontal dots, a distance L5 of 5.7 mm, and a distance L6 of 17 mm. In the test material (b), the length Lb (see FIG. 1B) of the anode wiring under the protruding portion of the adhesive was set to 1.4 mm.

  When such a test material (b) was subjected to a thermal shock test for 1500 hours and then subjected to a lighting test, no unlit portion was generated. Since no disconnection occurred, the evaluation is “good”.

  Next, the test material (c) is a large organic EL panel having 256 horizontal dots, a distance L5 of 4 mm, and a distance L6 of 74 mm. In the test material (c), the length Lc (see FIG. 1C) of the anode wiring under the protruding portion of the adhesive was set to 0.3 mm.

  When such a test material (c) was subjected to a thermal shock test for 1500 hours and then subjected to a lighting test, no unlit portion was generated. Since the disconnection did not occur, the evaluation is “good”.

  In FIG. 11, the thermal expansion coefficient of the adhesive protruding portion 114 and the thermal expansion coefficient of the anode wiring 112 are different. If the length L2 is 3.0 mm, disconnection occurs, and if it is 1.4 mm or 0.3 mm, disconnection does not occur. Therefore, if the length L2 is less than 3.0 mm, the disconnection is suppressed even if there is a difference in thermal expansion coefficient. It can be expected that, more preferably, if it is 1.4 mm or less, there is no fear of disconnection even if there is a difference in thermal expansion coefficient.

  The adhesive layer (FIG. 8, reference numeral 106) and the anode wiring 112 are also present under the sealing member 107, but the thermal expansion and contraction of the adhesive layer and the anode wiring 112 is suppressed by the sealing member 107 having a sufficiently high rigidity. Therefore, it is considered that no thermal expansion / contraction difference that leads to disconnection occurs between the adhesive layer and the anode wiring 12.

  Therefore, it turned out that a disconnection trouble can be avoided by paying attention to the adhesive protrusion 11 and length La-Lc shown in FIG. The invention completed based on the above knowledge is as follows.

According to a first aspect of the present invention, there is provided a support substrate, a light-emitting display unit provided on the support substrate and having at least a light-emitting organic layer sandwiched between a pair of electrodes, and the light-emitting element attached to the support substrate using an adhesive layer. A sealing member that covers the display unit and forms a sealed space; a driver IC provided on the support substrate outside the sealing member; and the electrode extending from the driver IC and penetrating the adhesive layer An organic EL panel comprising a plurality of anode wires and a plurality of cathode wires to be connected,
The plurality of anode wirings include at least two of a first group that crosses an adhesive protruding portion that protrudes from the bottom surface of the sealing member at a right angle, and a second group that exists on the left and right sides of the first group. Divided into groups,
The anode wiring belonging to the second group includes a bypass portion extending so as to bypass the adhesive protruding portion, and an anode side through portion that is bent from a tip of the bypass portion and at least part of which penetrates the adhesive protruding portion And an extension portion that is bent from the tip of the anode side through portion and is directed toward the electrode.

  In the invention which concerns on Claim 2, the length of the site | part where the anode side penetration part has overlapped with the adhesive protrusion part is less than 3.0 mm, It is characterized by the above-mentioned.

  In the invention which concerns on Claim 3, the length of the site | part where the anode side penetration part has overlapped with the adhesive protrusion part is 1.4 mm at the maximum, It is characterized by the above-mentioned.

  The invention according to claim 4 is characterized in that the bypass portion extends in parallel to one side of the sealing member, and the bypass portion and the anode side through portion are orthogonal to each other.

  In the invention according to claim 5, the cathode wiring has a cathode side penetration part that penetrates the adhesive protruding part, and the length of the portion where the cathode side penetration part overlaps with the adhesive protruding part is 3 Less than 0.0 mm.

  In the invention according to claim 6, the cathode wiring has a cathode side through portion that penetrates the adhesive protruding portion, and the length of the portion where the cathode side through portion overlaps the adhesive protruding portion is maximum. It is 1.4 mm.

  In the invention according to claim 1, the anode wiring has a detour portion, an anode side through portion, and an extension portion, and only the anode side through portion overlaps the adhesive protruding portion. The portion where the anode penetrating portion overlaps the adhesive protruding portion is much shorter than before. As a result, there is no need to worry about disconnection problems. Therefore, the organic EL panel can be increased in size.

  In the invention which concerns on Claim 2, the length of the site | part which the anode side penetration part has overlapped with the adhesive protrusion part is less than 3.0 mm, and if it is this length, the disconnection suppression in anode wiring can be anticipated.

  In the invention according to claim 3, the portion where the anode side through portion overlaps the adhesive protruding portion has a length of 1.4 mm or less, and there is a concern that a disconnection trouble may occur in the anode wiring with this length. Absent.

  In the invention which concerns on Claim 4, the detour part and the anode side penetration part are orthogonally crossed. The length of the anode side penetrating portion becomes the shortest, and the occurrence of disconnection trouble is more reliably avoided.

  In the invention which concerns on Claim 5, the length of the site | part which the cathode side penetration part has overlapped with the adhesive protrusion part is less than 3.0 mm, and if it is this length, the disconnection suppression in cathode wiring can be anticipated.

  In the invention according to claim 6, the portion where the cathode side through portion overlaps the adhesive protruding portion has a length of 1.4 mm or less, and there is a concern that a disconnection trouble may occur in the anode wiring with this length. Absent.

It is a figure which shows the principal part of the test material produced in order to establish this invention. It is a front view of the organic electroluminescent panel which concerns on this invention. FIG. 3 is a three-part enlarged view of FIG. 2. FIG. 4 is a view taken in the direction of arrow 4 in FIG. 2. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is an enlarged view of 6 parts in FIG. 3. It is a figure explaining the example of a change. It is principal part sectional drawing of the conventional organic electroluminescent panel. It is a 9-9 arrow line view (perspective view) of FIG. It is the figure which made the sealing material opaque. FIG. 11 is an enlarged view of part 11 in FIG. 10.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIG. 2, the organic EL panel 20 is a COG type organic EL panel, and includes a support substrate 21, a light emitting display unit 22 provided on the support substrate 21, and a light emitting display unit attached to the support substrate 21. A sealing member 13 covering 22, a driver IC 23 provided on the support substrate 21 outside the sealing member 13, a plurality of anode wirings 12 extending from the driver IC 23 to the light emitting display unit 22, and a plurality of wirings Cathode wiring 24.

The plurality of anode wirings 12 are wirings for connecting the anode electrode and the driver IC 23. For example, low resistance conductive materials such as ITO, chromium (Cr), aluminum (Al), or alloys thereof, which are the same material as the anode electrode. It consists of material or these laminated bodies.
The plurality of anode wirings 12 are bent in a staircase pattern with a central group 25C as a first group extending from the center of the driver IC 23 to the lower side of the sealing member 13 so as to be orthogonal to the side of the sealing member 13. However, it is divided into a left group 25L and a right group 25R as a second group heading under the sealing member 13. The plurality of cathode wirings 24 are also formed of the same material as that of the anode wiring 12. The second group may be at least one of the left group 25L and the right group 25.

  As shown in FIG. 3, the plurality of anode wires 12 belonging to the left and right groups 25L and 25R are, for example, first bundles 27L and 27R extending from the side of the central group 25C, and second bundles 28L extending from the sides. , 28R, and third bundles 29L, 29R extending from the sides thereof.

  The horizontal portions 31 and 31 as detour portions of the first bundles 27L and 27R are straight lines parallel to the sides of the sealing member 13, but the horizontal portions 32 and 32 as detour portions of the second bundles 28L and 28R are The step portions 30, 30 are provided in the middle, and in these step portions 30, 30, the horizontal portions 32, 32 of the second bundle 28L, 28R are left and right relative to the horizontal portions 31, 31 of the first bundle 27L, 27R. Aligned in the direction. Similarly, the horizontal portions 33 and 33 as detour portions of the third bundles 29L and 29R also have two stepped portions 30 and 30 in the middle, and the third bundles 29L and 29R are formed by these stepped portions 30 and 30. Horizontal portions 33, 33 are aligned with the horizontal portions 31, 31 of the first bundles 27L, 27R in the left-right direction. As a result, spaces S1 and S2 are generated below the horizontal portions 32 and 33, and effective use of the upper surface of the support substrate 21 is promoted.

  As shown in FIG. 4, the light emitting display unit 22 is placed on the support substrate 21, and the light emitting display unit 22 is covered with the sealing member 13. The driver IC 23 is mounted on the support substrate 21 outside the sealing member 13. A circularly polarizing plate 34 is attached under the support substrate 21.

  As shown in FIG. 5, the organic EL panel 20 includes a support substrate 21, a light-emitting display unit 22 provided on the support substrate 21 and sandwiching a light-emitting organic layer 35 between a pair of electrodes 36 and 37, and a support substrate. The main element is a sealing member 13 which is attached to 21 using an adhesive layer 38 and covers the light emitting display portion 22 to form a sealed space.

The support substrate 21 is an electrically insulating substrate made of rectangular transparent glass.
The light emitting display portion 22 is electrically connected to the anode electrode 36 through an anode electrode 36 formed in a plurality of lines and connected to the anode wiring 12, an insulating film 39, and an opening 41 provided in the insulating film 39. An organic layer 35 having at least an organic light-emitting layer connected to the cathode, and a cathode electrode 37 formed on the organic layer 35 in a plurality of lines orthogonal to the anode electrode 36 and connected to the cathode wiring 13 via dot contact holes 42; Consists of.

  The light-emitting display unit 22 is a passive matrix light-emitting display unit including a plurality of light-emitting pixels (organic EL elements) each having a portion in which the electrodes 36 and 37 are orthogonal and sandwich the organic layer 35. The anode electrode 36 is formed integrally with the anode wiring 12 at one end (the lower side in FIG. 2) or via the anode wiring 12 and a dot contact hole (not shown) formed separately. Connected.

  The organic layer 35 is formed by laminating a plurality of layers including at least an organic light emitting layer, and includes, for example, a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer. When a voltage is applied between the electrodes 36 and 37, electrons and holes are recombined in the organic layer 35, and the plurality of light emitting pixels emit light, pass through the support substrate 21 and the circularly polarizing plate 34, and display. Light 43 is emitted.

The sealing member 13 is made of a glass material molded into a concave shape in this example, but may be a flat plate.
The adhesive layer 38 is made of, for example, a glass epoxy resin adhesive. A sealing space is formed by attaching the sealing member 13 to the support substrate 21 with the adhesive layer 38, and the light emitting display unit 22 is accommodated in the sealing space. Since the luminescent organic layer 35 is sensitive to humidity, it is stored in a sealed space. It is preferable to provide a desiccant in this sealed space.

As shown in FIG. 6, the anode wiring 12 of the third bundle 29R belonging to the right group 25R is bent at a right angle from the tip of the horizontal portion 33 and the horizontal portion 33 so that at least a part thereof protrudes the adhesive protruding portion 11. It has an anode side through portion 45 that penetrates, and an extension portion 46 that is bent at a substantially right angle from the tip of the anode side through portion 45 and extends toward the anode electrode 36.
The length L7 of the portion overlapping the adhesive protruding portion 11 is about 0.3 mm, and the occurrence of disconnection trouble is avoided.

  Although the description is omitted, the horizontal portion 31, the first bundles 27L, 27R, the second bundles 28L, 28R, and the third bundle 29L belonging to the left and right groups 25L, 25R are also similarly described. 31, 32, 32, 33, an anode side penetrating portion bent at a right angle from the tip of the horizontal portions 31, 31, 32, 32, 33, and at least a part penetrating the adhesive protruding portion 11, and the anode side penetrating portion And an extension portion that is bent substantially at a right angle from the tip of the portion and extends toward the anode electrode 37.

  Or as shown in FIG. 7, the anode side penetration part 45 may be diagonal. However, in the case of slanting, the length L8 of the portion overlapping the adhesive protruding portion 11 is less than 3.0 mm, more preferably 1.4 mm or less, that is, 1.4 mm at the maximum. This is because disconnection trouble can be suppressed if it is less than 3.0 mm, and occurrence of disconnection trouble caused by the adhesive protruding portion 11 can be more reliably avoided if it is 1.4 mm or less.

Alternatively, the horizontal portions 31, 32, and 33 may be bypass portions that extend so as to bypass the adhesive protruding portion 11, and may be inclined with respect to one side of the sealing member 13.
In this embodiment, the plurality of anode wirings 12 are divided into three groups, that is, the central group 25C, the left group 25L, and the right group 25R. What is necessary is just to be divided into at least two groups of the first group that crosses the first group and the second group that exists on the left and right sides of the first group. It may be.

  The present invention can also be applied to the cathode wiring 24. That is, in the cathode wiring 24 shown in FIG. 2, the length of the portion overlapping the adhesive protruding portion 11 is less than 3.0 mm, more preferably 1.4 mm or less, so that disconnection of the cathode wiring 24 is avoided. In this embodiment, the cathode wiring 24 is orthogonal to the adhesive protruding portion 11, and the length of the portion overlapping the adhesive protruding portion 11 is about 0.3 mm as in the case of the anode wiring 12, so that a disconnection trouble is caused. Occurrence is avoided.

  In addition, although this invention is suitable for a large sized organic EL panel, it may be applied to a medium-sized organic EL panel.

  The present invention is suitable for a large organic EL panel.

  DESCRIPTION OF SYMBOLS 11 ... Adhesive protrusion part, 12 ... Anode wiring, 13 ... Sealing member, 20 ... Organic EL panel, 21 ... Support substrate, 22 ... Light emission display part, 23 ... Driver IC, 24 ... Cathode wiring, 25C ... 1st Group (center group), 25L ... second group (left group), 25R ... second group (right group), 31-33 ... detour part (horizontal part), 45 ... anode side through part, 46 ... Extension part, L7, L8 ... Length of the part which has overlapped with the adhesive protrusion part.

Claims (6)

A support substrate, a light-emitting display portion provided on the support substrate and having at least a light-emitting organic layer sandwiched between a pair of electrodes, and a sealed space attached to the support substrate using an adhesive layer and covering the light-emitting display portion A sealing member to be formed, a driver IC provided on the support substrate outside the sealing member, and a plurality of anode wirings extending from the driver IC and passing through the adhesive layer and connected to the electrodes And a plurality of cathode wirings, an organic EL panel comprising:
The plurality of anode wirings include at least two of a first group that crosses an adhesive protruding portion that protrudes from the bottom surface of the sealing member at a right angle, and a second group that exists on the left and right sides of the first group. Divided into groups,
The anode wiring belonging to the second group includes a bypass portion extending so as to bypass the adhesive protruding portion, and an anode side through portion that is bent from a tip of the bypass portion and at least part of which penetrates the adhesive protruding portion And an extended portion that is bent from the tip of the anode side penetrating portion and extends toward the electrode.   2. The organic EL panel according to claim 1, wherein a length of a portion where the anode side through portion overlaps the adhesive protruding portion is less than 3.0 mm.   2. The organic EL panel according to claim 1, wherein a length of a portion where the anode side through portion overlaps the adhesive protruding portion is 1.4 mm at the maximum.   3. The organic EL panel according to claim 1, wherein the bypass portion extends in parallel with one side of the sealing member, and the bypass portion and the anode side through portion are orthogonal to each other. . The cathode wiring has a cathode side penetrating portion that penetrates the adhesive protruding portion,
2. The organic EL panel according to claim 1, wherein a length of a portion where the cathode side through portion overlaps the adhesive protruding portion is less than 3.0 mm. The cathode wiring has a cathode side penetrating portion that penetrates the adhesive protruding portion,
2. The organic EL panel according to claim 1, wherein the length of the portion where the cathode side through portion overlaps the adhesive protruding portion is 1.4 mm at the maximum.

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