TWM493759U - Structure of organic light emitting diode - Google Patents

Abstract

A structure of organic light emitting diode is disclosed. The structure of organic light emitting diode comprises a first substrate; a first conductive layer disposed on the first substrate; an organic emitting layer disposed on the first conductive layer; a second conductive layer disposed on the organic emitting layer; a barrier film disposed on the second conductive layer; an anti-reflection layer disposed on the barrier film; and a second substrate disposed on the anti-reflection layer. The anti-reflection layer is disposed between the barrier film and the second substrate so as to prevent the light emitted by the organic emitting layer conducts the total reflection phenomenon between the barrier film and the second substrate.

Description

Organic light emitting diode structure 【0001】

The present invention relates to an organic light-emitting diode structure, and more particularly to an organic light-emitting diode structure in which an anti-reflection layer is disposed between a substrate and a barrier layer.

【0002】

In recent years, the development of flat panel display technology has been continuously updated. Among them, organic light emitting diode (OLED), also known as organic electroluminescence (OEL), is an advantage that is difficult to achieve with other flat panel display technologies. New generation technology, including power saving, ultra-thin thickness, light weight, self-illumination, no viewing angle limitation, fast response speed, high photoelectric efficiency, no backlight structure and color filter structure, high contrast, high luminance efficiency, high brightness Multi-color and color (RGB) components manufacturing capabilities, a wide range of operating temperatures, etc., is considered to be one of the most promising flat display technologies in the future.

[0003]

Generally, the cover glass is usually disposed on the organic light-emitting layer in the organic light-emitting diode structure to prevent moisture or impurities in the environment from entering the organic light-emitting diode structure, thereby affecting the organic light-emitting diode. The quality of the light. As shown in FIG. 1 , a conventional organic light-emitting diode generally includes an anode electrode, an organic light-emitting layer, and a cathode electrode provided on a metal dielectric layer. By applying a voltage difference between the cathode electrode and the anode electrode, The light is emitted by combining electrons and holes in the organic light-emitting layer. Moreover, as described above, in the conventional organic light-emitting diode structure, a cover glass may be included to prevent the moisture or impurities in the air or the environment from affecting the light-emitting quality of the organic light-emitting diode. In addition, when encapsulating the cover glass and the organic light emitting diode, a barrier film (for example, a colloid layer) is usually used to adhere the cover glass and the light emitting diode structure.

[0004]

However, as shown in Fig. 1, since the light emitted from the organic light-emitting layer does not have a specific direction, the light can be distinguished into a forward light emission (e.g., light L1') and a lateral light output (e.g., light L2'). Among them, the positive light output means that the light emitted by the organic light-emitting layer enters the cover glass at an angle of zero, so that the light that is emitted in the forward direction is not refracted. The lateral light exiting means that the light emitted by the organic light-emitting layer enters the cover glass at an angle other than zero. Therefore, as shown by the light L2' in FIG. 1, the laterally emitted light passes through the interface between the colloid and the cover glass. There are also phenomena of refraction and reflection. If the angle of incidence of the laterally emitted light from the colloidal incident cover glass is greater than a critical angle, total reflection occurs in the region B. In this way, the light does not penetrate the cover glass, but is totally reflected to the colloid or barrier film and the organic light-emitting layer, and the light reflected back to the organic light-emitting layer may be reflected and passed by the organic light-emitting layer. Cover the glass and shoot it (see light L3'). In addition, the lateral light emitted by the organic light-emitting layer may also be totally reflected and reflected to the adjacent organic light-emitting layer (see light L4').

[0005]

As a result, the above-mentioned light rays L3' and L4' may affect the brightness emitted by the adjacent organic light-emitting layer, causing light leakage (see area A in Fig. 2) or image blurring (see Figure 3). )Case.

[0006]

In view of the above-mentioned problems of the prior art, the purpose of the present invention is to provide an organic light-emitting diode structure to solve the problem of light leakage or image blur caused by the total reflection of the light emitted by the conventional organic light-emitting diode structure. problem.

【0007】

According to the foregoing objective, the present invention provides an organic light emitting diode structure comprising: a first substrate; a first conductive layer disposed on the first substrate; an organic light emitting layer disposed on the first conductive layer; and a second conductive layer, The barrier layer is disposed on the second conductive layer; the anti-reflective layer is disposed on the barrier film; and the second substrate is disposed on the anti-reflective layer. The anti-reflective layer is disposed between the barrier layer and the second substrate to prevent total light from being generated between the barrier layer and the second substrate by the light emitted by the organic light-emitting layer.

[0008]

The first substrate is an inter-metal dielectric layer.

【0009】

The organic light-emitting layer includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer which are sequentially arranged.

[0010]

The second substrate is a cover glass or a color filter.

[0011]

Wherein, the first conductive layer is an anode electrode and the second conductive layer is a cathode electrode, or the first conductive layer is a cathode electrode and the second conductive layer is an anode electrode.

[0012]

Wherein, the barrier layer is a colloid layer.

[0013]

Wherein, the colloid in the colloid layer is a photocurable adhesive or a thermosetting adhesive.

[0014]

Wherein, the refractive index of the antireflection layer is greater than 1.2.

[0015]

Wherein, the antireflection layer is selected from the group consisting of magnesium fluoride (MgF ₂ ), cerium oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), cerium fluoride (CeF ₃ ), zirconia (ZrO ₂ ) A material composed of a group consisting of titanium dioxide (TiO ₂ ), tantalum pentoxide (Ta ₂ O ₅ ), and zinc sulfide (ZnS).

[0016]

Wherein, the anti-reflection layer is a transparent layer.

[0017]

Wherein, the anti-reflection layer is directly disposed on the second substrate.

[0018]

Wherein, the anti-reflection layer is disposed on both sides of the second substrate at the same time.

[0019]

As described above, the organic light-emitting diode structure according to the present invention may have one or more of the following advantages:

[0020]

(1) The organic light-emitting diode structure of the present invention can effectively reduce the light emitted by the organic light-emitting layer between the colloid and the second substrate by the anti-reflection layer disposed between the barrier layer and the second substrate. reflection.

[0021]

(2) The organic light-emitting diode structure of the present invention can effectively solve the problem of light leakage or image blurring of the conventional organic light-emitting diode structure by disposing the anti-reflection layer between the barrier layer and the second substrate. .

[0035]

10‧‧‧First substrate

20‧‧‧First conductive layer

30‧‧‧Organic light-emitting layer

31‧‧‧ hole injection layer

32‧‧‧ hole transport layer

33‧‧‧Lighting layer

34‧‧‧Electronic transport layer

35‧‧‧Electronic injection layer

40‧‧‧Second conductive layer

50‧‧‧Barrier

60‧‧‧second substrate

70‧‧‧Anti-reflective layer

L1, L2, L3, L4, L1', L2', L3', L4'‧‧‧ rays

A, B‧‧‧ area

[0022]

Figure 1 is a schematic cross-sectional view of a conventional organic light-emitting diode.

[0023]

Fig. 2 is a photographic view showing light leakage in a conventional organic light-emitting diode.

[0024]

Fig. 3 is a photographic view showing image blurring in a conventional organic light-emitting diode.

[0025]

Fig. 4 is a schematic cross-sectional view showing the structure of the organic light-emitting diode of the present invention.

[0026]

Fig. 5 is a schematic cross-sectional view showing the organic light-emitting layer in the organic light-emitting diode structure of the present invention.

[0027]

Figure 6 is a photo photograph of the organic light-emitting diode structure of the present invention.

[0028]

Please refer to FIG. 4, which is a schematic cross-sectional view of the organic light emitting diode structure of the present invention. As shown in FIG. 4, the organic light emitting diode structure of the present invention comprises: a first substrate 10, a first conductive layer 20, an organic light emitting layer 30, a second conductive layer 40, a barrier layer 50, a second substrate 60, and an anti-resistance. Reflective layer 70. The first conductive layer 20 is disposed on the first substrate 10, the organic light emitting layer 30 is disposed on the first conductive layer 20, the second conductive layer 40 is disposed on the organic light emitting layer 30, and the barrier layer 50 is disposed on the second conductive layer 40. The anti-reflective layer 70 is disposed on the barrier layer 50, and the second substrate 60 is disposed on the anti-reflective layer 70. Moreover, the anti-reflective layer 70 is disposed between the barrier layer 50 and the second substrate 60 to prevent total light from being generated between the barrier layer 50 and the second substrate 60 by the light emitted by the organic light-emitting layer 30.

[0029]

The first substrate 20 can be, for example, an inter-metal dielectric layer (IMD). The organic light-emitting layer 30 may include a hole injection layer 31, a hole transport layer 32, a light-emitting layer 33, an electron transport layer 34, and an electron injection layer 35 which are sequentially arranged (see FIG. 5). The second substrate 60 can be, for example, a cover glass. The first conductive layer 20 can be, for example, an anode electrode and the second conductive layer 40 can be, for example, a cathode electrode, or the first conductive layer 20 can be, for example, a cathode electrode and the second conductive layer 40 can be, for example, an anode electrode. The barrier layer 50 can be, for example, a colloid layer. The colloid in the colloid layer may be, for example, a photocurable adhesive or a thermosetting adhesive. The types and properties of the layers, photocurable adhesives, or thermosetting adhesives included in the above organic light-emitting layer 30 are well known to those of ordinary skill in the art, and therefore will not be described herein.

[0030]

In the organic light-emitting diode structure of the present invention, since the anti-reflection layer 70 is disposed between the barrier layer 50 and the second substrate 60, the light emitted from the organic light-emitting layer 30 is incident on the second substrate 60 from the barrier layer 50. When the light rays L3 and L4 are not totally reflected, they are directly incident on the second substrate 60, so that the probability of total reflection of light is greatly reduced. Therefore, it is possible to effectively prevent the light from affecting the luminous efficiency of the adjacent organic light-emitting layer due to total reflection.

[0031]

The refractive index of the anti-reflective layer 70 can be, for example, greater than 1.2. Wherein, the anti-reflection layer 70 can be selected, for example, from magnesium fluoride (MgF ₂ ), cerium oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), cerium fluoride (CeF ₃ ), zirconia (ZrO). ₂ ) A material composed of a group consisting of titanium dioxide (TiO ₂ ), tantalum pentoxide (Ta ₂ O ₅ ), and zinc sulfide (ZnS). The refractive index and material of the anti-reflective layer 70 are merely examples and are not limited. Any refractive index and material of the anti-reflection layer which can reduce the total reflection of light are the technical contents claimed by the author.

[0032]

Further, the anti-reflective layer 70 may be, for example, a transparent layer to avoid the properties of the anti-reflective layer 70 itself from affecting the luminescent properties. Also, the anti-reflection layer 70 can be disposed directly on the second substrate 60, for example. In other words, in the encapsulation process of the organic light emitting diode structure, the second substrate 60 on which one side of the anti-reflection layer 70 is disposed may be provided, and the second substrate 60 and the light-emitting diode provided with the barrier layer 50 may be provided. The body is bonded, and the anti-reflective layer 70 is in direct contact with the barrier layer 50 to complete the packaging of the organic light emitting diode structure. In addition, the anti-reflection layer 70 can be simultaneously disposed on both sides of the second substrate 60 according to actual needs. In other words, the anti-reflection layer 70 may be disposed not only between the barrier layer 50 and the second substrate 60, but also on the other side of the second substrate 60 (ie, the light-emitting side of the organic light-emitting diode structure).

[0033]

Please refer to FIG. 3 and FIG. 6 together. As shown in FIG. 3, in the conventional organic light-emitting diode structure, since the total reflection phenomenon of light affects the luminous efficiency of the adjacent organic light-emitting layer, it is presented. The image is blurred; as shown in FIG. 6 , since the anti-reflection layer 70 is disposed in the organic light-emitting layer structure, the light emitted by the organic light-emitting layer 30 can be effectively avoided in the barrier layer 50 and the second substrate 60. The total reflection occurs between the adjacent organic light-emitting layers, so that the light leakage or image blurring of the conventional organic light-emitting diode structure does not occur, and the image is clear and the light-emitting quality is good.

[0034]

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of this creation shall be included in the scope of the appended patent application.

10‧‧‧First substrate

20‧‧‧First conductive layer

30‧‧‧Organic light-emitting layer

40‧‧‧Second conductive layer

50‧‧‧Barrier

60‧‧‧second substrate

70‧‧‧Anti-reflective layer

L1, L2, L3, L4‧‧‧ rays

Claims (13)

[Item 1] An organic light emitting diode structure comprising:
a first substrate;
a first conductive layer disposed on the first substrate;
An organic light emitting layer is disposed on the first conductive layer;
a second conductive layer disposed on the organic light emitting layer;
a barrier layer disposed on the second conductive layer;
An anti-reflection layer disposed on the barrier layer; and a second substrate disposed on the anti-reflection layer The anti-reflective layer is disposed between the barrier layer and the second substrate to prevent total light from being generated between the barrier layer and the second substrate by the light emitted by the organic light-emitting layer. [Item 2] The organic light emitting diode structure according to claim 1, wherein the first substrate is an intermetal dielectric layer. [Item 3] The organic light emitting diode structure according to claim 1, wherein the organic light emitting layer comprises a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron. Inject the layer. [Item 4] The organic light emitting diode structure of claim 1, wherein the second substrate is a cover glass or a color filter. [Item 5] The organic light emitting diode structure of claim 1, wherein the first conductive layer is an anode electrode and the second conductive layer is a cathode electrode, or the first conductive layer is a cathode electrode and the first conductive layer is a cathode electrode The second conductive layer is an anode electrode. [Item 6] The organic light-emitting diode structure according to claim 1, wherein the barrier layer is a colloid layer. [Item 7] The organic light emitting diode structure according to claim 6, wherein the colloid in the colloid layer is a photocurable adhesive or a thermosetting adhesive. [Item 8] The organic light emitting diode structure according to claim 1, wherein the antireflection layer has a refractive index greater than 1.2. [Item 9] The organic light emitting diode structure according to claim 1, wherein the antireflection layer is selected from the group consisting of magnesium fluoride (MgF ₂ ), cerium oxide (SiO ₂ ), and aluminum oxide (Al ₂ O). ₃ ) A material composed of a group consisting of cesium fluoride (CeF ₃ ), zirconium oxide (ZrO ₂ ), titanium dioxide (TiO ₂ ), tantalum pentoxide (Ta ₂ O ₅ ), and zinc sulfide (ZnS). [Item 10] The organic light emitting diode structure according to claim 1, wherein the antireflection layer is a transparent layer. [Item 11] The organic light emitting diode structure of claim 1, wherein the antireflection layer is directly disposed on the second substrate. [Item 12] The organic light emitting diode structure of claim 11, wherein the antireflection layer is disposed on both sides of the second substrate.