CN100466328C - Organic Light Emitting Display Panel - Google Patents

Abstract

The invention relates to an organic light-emitting display panel, which comprises a substrate, at least one organic light-emitting region, at least one protective layer, at least one blocking layer and a sealing layer, wherein the organic light-emitting region is formed on the substrate and is provided with a plurality of pixels; the protective layer is formed on the substrate and the organic light-emitting region; the barrier layer is formed on the protective layer and/or the substrate; the sealing layer is formed on the substrate and at least covers the periphery of the barrier layer and/or the protective layer.

Description

Organic Light Emitting Display Panel

technical field

The invention relates to a display panel, in particular to an organic light emitting display panel.

Background technique

In recent years, flat panel displays are developing toward high brightness, planarization, thinness, and energy saving. In view of this, organic light emitting (OEL) display devices have become one of the most promising development directions in the optoelectronic industry. Organic light-emitting display devices are devices that use the self-luminous properties of organic functional materials to achieve display effects. According to the molecular weight of organic functional materials, they can be divided into small molecule organic light-emitting display devices. OLED, SM-OLED) and polymer light-emitting display (polymer light-emitting display, PLED) two categories.

Since the organic light-emitting element (organic functional material) is very sensitive to moisture and oxygen, it is easy to produce a dark spot (Dark Spot) after contact with the atmosphere. Therefore, in order to ensure the service life of the organic light-emitting element, as shown in Figure 1, the current The packaging method is to directly deposit the inorganic film 41 (such as _Six O _y ) on the organic light-emitting element 42 by means of sputtering, plasma-assisted chemical vapor deposition (PECVD) or electron beam.

In addition, as shown in FIG. 2, Vitex System Company of the United States also directly deposits an inorganic/organic multi-layer barrier layer structure 51 (Barix Coating) on the organic light-emitting element 52 to prevent moisture and oxygen from intruding into the organic light-emitting element 52. middle.

However, moisture and oxygen not only intrude into the organic light-emitting device from the front side (direction A), but also easily enter the device through the edge of the barrier layer (inorganic film) (direction B). However, the above two packaging methods can only prevent the intrusion of water vapor and oxygen from the front (direction A), but cannot prevent the intrusion of water vapor and oxygen from the side (direction B).

Contents of the invention

The object of the present invention is to overcome the deficiencies and defects of the prior art, and provide an organic light-emitting display panel that prevents moisture and oxygen from invading.

To achieve the above object, an organic light-emitting display panel according to the present invention includes a substrate, at least one organic light-emitting region, at least one protective layer, at least one barrier layer, and a sealing layer, wherein the organic light-emitting region is formed on the substrate , and the organic light-emitting region has several pixels; the protective layer is formed on the substrate and the organic light-emitting region; the barrier layer is formed on the protective layer and/or the substrate; the sealing layer is formed on the substrate, and at least covers The perimeter of the barrier and/or protective layer.

To achieve the above object, an organic light-emitting display panel according to the present invention includes a substrate, at least one organic light-emitting region, at least one protrusion, at least one protective layer, at least one barrier layer, and a sealing layer, wherein the organic light-emitting The region is formed on the substrate, and the organic light-emitting region has several pixels; the protrusion is formed on the substrate; the protection layer is formed on the substrate and the organic light-emitting region; the blocking layer is formed on the protection layer and/or the protrusion; The sealing layer is formed on the substrate and/or the protrusion, and at least covers the periphery of the barrier layer and/or the protection layer.

To achieve the above object, an organic light-emitting display panel according to the present invention includes a substrate, at least one organic light-emitting region, at least one protective layer, and at least one barrier layer, wherein the organic light-emitting region is formed on the substrate, and the organic light-emitting region The region has several pixels; the protection layer is formed on the substrate and the organic light emitting region; the barrier layer is formed on the protection layer and the substrate, and one of the protection layers and/or one of the barrier layers is formed by photochemical vapor deposition form.

Based on the above, the organic light emitting display panel of the present invention uses a barrier layer or a sealing layer to prevent moisture and oxygen from invading from the front and side of the device. Compared with the prior art, the barrier layer or sealing layer of the present invention is formed on the protective layer and the substrate, which can prevent moisture and oxygen from penetrating from the edge of the protective layer to the inside of the element. At the same time, the protective layer of the present invention can prevent discontinuity of the subsequently formed barrier layer or sealing layer, and further prevent moisture and oxygen from entering the element through pores. In addition, the protrusions of the present invention make the sealing layer present a wavy structure, which not only increases the contact area and adhesion between the sealing layer and other parts (protrusions, substrates), but also reduces the stress caused by thermal expansion and contraction , it can increase the path length of water vapor and oxygen penetration, thereby slowing down the rate of water vapor and oxygen intrusion. Furthermore, the multi-layer barrier layer of the present invention can stagger the positions of the pores between the barrier layers, effectively compensating for the defects of the film layer. Furthermore, the barrier layer in the present invention can be composed of barrier layers with different Young's modulus, and the barrier layer with lower Young's modulus is sandwiched between the barrier layers with higher Young's modulus to produce The buffer acts to reduce the stress between such barrier layers. In addition, the flat layer, barrier layer or sealing layer system can be formed by photochemical vapor deposition, which can not only provide sufficient film formation rate at low temperature (below about 300°C), but also, due to the formation of low temperature The film layer structure is relatively loose, which can reduce the internal stress of the film layer and reduce the possibility of peeling off the film layer.

Description of drawings

Fig. 1 is a schematic diagram of implementation of one of the existing packaging methods of organic light-emitting elements;

Fig. 2 is another implementation schematic diagram of the packaging method of the existing organic light-emitting element;

3, FIG. 4, FIG. 5 and FIG. 6 are schematic diagrams of a set of organic light-emitting display panels in the first embodiment of the present invention;

7, FIG. 8, FIG. 9 and FIG. 10 are a set of schematic diagrams of the organic light emitting display panel in the second embodiment of the present invention; and

FIG. 11 and FIG. 12 are schematic diagrams of a group of organic light emitting display panels in the third embodiment of the present invention.

Explanation of symbols in the figure:

1 organic light emitting display panel

11 Substrate

12 organic light-emitting area

121 pixels

1211 first electrode

1212 Organic functional layer

1213 Second electrode

13 protective layer

14, 141, 142, 143 barrier layer

15 sealing layer

2 organic light emitting display panel

21 Substrate

22 organic light-emitting area

221 pixels

2211 First electrode

2212 organic functional layer

2213 Second electrode

23 protrusion

24 layers of protection

25 barrier layer

26 sealing layer

3 organic light emitting display panel

31 Substrate

32 organic light-emitting area

321 pixels

3211 first electrode

3212 organic functional layer

3213 Second electrode

33 protective layer

34, 341, 342, 343 barrier layer

41 inorganic membrane

42 organic light-emitting elements

51 Multi-layer barrier structure

52 organic light emitting elements

Detailed ways

The organic light emitting display panel according to a preferred embodiment of the present invention will be described below with reference to related figures. For ease of description, the relevant figures are only shown in the following with a single pixel.

first embodiment

As shown in FIG. 3, FIG. 4, FIG. 5 and FIG. 6, the organic light emitting display panel 1 of the first embodiment of the present invention includes a substrate 11, at least one organic light emitting region 12, at least one protective layer 13, and at least one barrier layer 14 and a sealing layer 15, wherein the organic light emitting region 12 is formed on the substrate 11, and the organic light emitting region 12 has several pixels 121; the protective layer 13 is formed on the substrate 11 and the organic light emitting region 12; the barrier layer 14 formed on the protective layer 13 and/or the substrate 11 ; the sealing layer 15 is formed on the substrate 11 and covers at least the periphery of the barrier layer 14 and/or the protective layer 13 .

In this embodiment, the substrate 11 may be a flexible substrate or a rigid substrate. In addition, the substrate 11 can also be a plastic substrate or a glass substrate or the like. Among them, the flexible substrate and the plastic substrate can be polycarbonate (polycarbonate, PC) substrate, polyester (polyester, PET) substrate, cyclic olefin copolymer (cyclic olefin copolymer, COC) substrate or metal chromate substrate-cycloolefin copolymerization Material (metallocene-based cyclic olefin copolymer, mCOC) substrate. Certainly, the substrate 11 may also be a silicon substrate.

In addition, referring to FIG. 3 , the pixel 121 includes a first electrode 1211 , at least one organic functional layer 1212 and a second electrode 1213 in sequence, and the first electrode 1211 is located on the substrate 11 .

In this embodiment, the first electrode 1211 is formed on the substrate 11 by sputtering or ion plating. Here, the first electrode 1211 is usually used as an anode and its material is usually a transparent conductive metal oxide, such as indium tin oxide (ITO), aluminum zinc oxide (AlZnO) or indium zinc oxide (IZO).

In addition, the organic functional layer 1212 generally includes a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer (not shown in the figure). Wherein, the organic functional layer 1212 is formed on the first electrode 1211 by means of evaporation, spin coating, ink jet printing or printing. In addition, the light emitted by the organic functional layer 1212 may be blue light, green light, red light, white light, other monochromatic light or a color light formed by combining monochromatic light.

Referring to FIG. 3 again, the second electrode 1213 is located on the organic functional layer 1212 . Here, the second electrode 1213 is formed on the organic functional layer 1212 by using methods such as evaporation or sputtering. In addition, the material of the second electrode 1213 can be selected from but not limited to aluminum (Al), calcium (Ca), magnesium (Mg), indium (In), tin (Sn), manganese (Mn), silver (Ag), Gold (Au) and alloys containing magnesium (such as magnesium silver (Mg:Ag) alloy, magnesium indium (Mg:In) alloy, magnesium tin (Mg:Sn) alloy, magnesium antimony (Mg:Sb) alloy and magnesium tellurium ( Mg:Te) alloy), etc.

Next, please refer to FIG. 3 again, the protective layer 13 is formed on the substrate 11 and the organic light emitting region 12 . Here, the protective layer 13 can be formed on the substrate 11 and the organic light emitting region 12 by photochemical vapor deposition. Wherein, the photochemical vapor deposition method may be a vacuum ultraviolet (Vacuum Ultra-Violet, VUV) chemical vapor deposition method.

Since the photochemical vapor deposition method uses photons to decompose the excited reaction gas, the reaction can be carried out in a low temperature environment (below about 300° C.). In addition, in this embodiment, since the structure of the protection layer 13 formed by the photochemical vapor deposition method is relatively loose, the internal stress of the film layer can be reduced, so the protection layer 13 can be prevented from peeling off. Of course, the protection layer 13 can also be formed on the substrate 11 and the organic light emitting region 12 by sputtering.

Please refer to FIG. 3 again, the protective layer 13 in this embodiment has waterproof and oxygen-proof functions, and can protect the organic light-emitting region 12 from moisture and oxygen. Furthermore, the protective layer 13 is also used to cover the uneven organic light emitting region 12 for planarization, so that the subsequent film layer (barrier layer 14) formed on the protective layer 13 has a better uniformity, instead of Discontinuities occur. At the same time, the protection layer 13 can cover the fine particles existing in the process.

In addition, please refer to FIG. 3 again, the protection layer 13 of this embodiment can prevent the barrier layer 14 formed subsequently from being discontinuous, so that moisture and oxygen can enter through the pores.

In this embodiment, the protective layer 13 is made of an inorganic material, and the protective layer 13 is selected from silicon oxide (SiOx), diamond-like carbon film (Diamond Like Carbon, DLC), silicon nitride (SiNx), silicon oxynitride (SiOxNy) And at least one of aluminum oxide (Al2O3).

Referring to FIG. 3 again, the barrier layer 14 of this embodiment is formed on the protection layer 13 and the substrate 11 . Certainly, as shown in FIG. 4 , FIG. 5 and FIG. 6 , the barrier layer 14 can also be formed on the protection layer 13 .

Wherein, the barrier layer 14 can be formed by photochemical vapor deposition. Of course, the barrier layer 14 can also be formed by sputtering.

As mentioned above, the structure of the barrier layer 14 formed by the photochemical vapor deposition method is relatively loose, which can reduce the internal stress of the film layer, so that the barrier layer 14 can be prevented from peeling off.

In this embodiment, the barrier layer 14 is an inorganic material, wherein the barrier layer 14 is selected from silicon oxide, diamond-like film, silicon nitride, silicon oxynitride, aluminum oxide and metals (including but not limited to aluminum, copper, gold and silver) at least one of them. Here, the barrier layer 14 is waterproof, which can further improve the reliability of the organic light emitting display panel 1 .

In addition, as shown in FIG. 3, at least one of the plurality of barrier layers 14 may be formed by photochemical vapor deposition. Of course, at least one of the barrier layers 14 can also be formed by sputtering.

Here, the barrier layer 14 can also have waterproof and cushioning functions at the same time. For example: as shown in Figure 3, the barrier layers 141, 143 (materials such as silicon nitride, silicon oxynitride, diamond-like film, aluminum oxide and metals (such as aluminum, copper, gold and silver)) have extremely high Water resistance can effectively prevent the intrusion of water vapor and oxygen; and the barrier layer 142 (material such as silicon oxide) sandwiched between the barrier layers 141 and 143 has a small mechanical strength, so that it has a buffer function and can effectively Reduce the internal stress of the barrier layer 14 as much as possible. This kind of multi-layer structure can stagger the positions of the pores between the barrier layers 14, effectively compensate for the defects of the film layer, and also increase the penetration path of water vapor, further enhancing the waterproof effect.

In addition, referring to FIG. 3 and FIG. 4 again, the sealing layer 15 is formed on the substrate 11 and covers at least the periphery of the barrier layer 14 and/or the protection layer 13 . Of course, as shown in FIG. 5 and FIG. 6 , the sealing layer 15 can also completely cover the barrier layer 14 and the protective layer 13 .

In this embodiment, the sealing layer 15 can be formed by photochemical vapor deposition. Of course, the sealing layer 15 can also be formed by sputtering.

In this embodiment, the sealing layer 15 is an inorganic material, and is selected from silicon oxide, diamond-like film, silicon nitride, silicon oxynitride, aluminum oxide and metals (including but not limited to aluminum, copper, gold and silver ) at least one of them. Here, the sealing layer 15 is waterproof, which can further improve the reliability of the organic light emitting display panel 1 .

second embodiment

In addition, referring to FIG. 7, FIG. 8, FIG. 9 and FIG. 10, the organic light-emitting display panel 2 of the second embodiment of the present invention includes a substrate 21, at least one organic light-emitting region 22, at least one protrusion 23, at least one A protective layer 24, at least one barrier layer 25 and a sealing layer 26, wherein the organic light emitting region 22 is formed on the substrate 21, and the organic light emitting region 22 has several pixels 221; the protrusion 23 is formed on the substrate 21; The protection layer 24 is formed on the substrate 21 and the organic light emitting region 22; the barrier layer 25 is formed on the protection layer 24 and/or the protrusion 23; the sealing layer 26 is formed on the substrate 21 and/or the protrusion 23, and Cover at least the periphery of the barrier layer 25 and/or the protective layer 24 .

In this embodiment, the pixel 221 sequentially includes a first electrode 2211 , at least one organic functional layer 2212 and a second electrode 2213 , and the first electrode 2211 is located on the substrate 21 .

In this embodiment, the features and functions of the substrate 21, the organic light emitting region 22, the pixel 221, the first electrode 2211, the organic functional layer 2212, and the second electrode 2213 are the same as those in the first embodiment, and are not repeated here. repeat.

Referring again to FIG. 7 , FIG. 8 , FIG. 9 and FIG. 10 , the protective layer 24 can prevent the barrier layer 25 formed subsequently from being discontinuous, so that moisture and oxygen can enter through the pores. In addition, the features and functions of the protective layer 24 are the same as those of the protective layer 13 in the first embodiment, and will not be repeated here.

Next, referring to FIG. 7 , FIG. 8 and FIG. 9 , the barrier layer 25 is formed on the protection layer 24 . Referring to FIG. 10 again, of course, the barrier layer 25 can also be formed on the protective layer 24 and the protruding portion 23 . In this embodiment, other features and functions of the barrier layer 25 are the same as those of the barrier layer 14 in the first embodiment, and will not be repeated here.

Referring to FIG. 7 , FIG. 8 , FIG. 9 and FIG. 10 , the protruding portion 23 is formed on the substrate 21 . In this embodiment, the protrusions 23 are connected to each other (as shown in FIG. 8 ). Of course, the protruding portion 23 can also be provided independently (as shown in FIG. 7 , FIG. 9 and FIG. 10 ).

In addition, in this embodiment, the material of the protruding portion 23 is waterproof material, such as but not limited to photosensitive material (such as photoresist) or silicon dioxide.

Furthermore, the shape of the protruding portion 23 in this embodiment may be a block shape, a long block shape, or the like. In addition, in this embodiment, as shown in FIG. 7 , FIG. 8 , FIG. 9 and FIG. 10 , the protruding portion 23 can prevent the discontinuity of the subsequently formed sealing layer 26 , so that water vapor and oxygen can pass through the pores. Enter.

Referring to FIG. 7 and FIG. 10 again, the sealing layer 26 covers the periphery of the barrier layer 25 and/or the protection layer 24 . Certainly, as shown in FIG. 8 and FIG. 9 , the sealing layer 26 completely covers the barrier layer 25 , the protective layer 24 , the protruding portion 23 and the substrate 21 . Since part of the sealing layer 26 is formed on the protrusion 23, the sealing layer 26 presents a wave-like structure, which not only increases the gap between the sealing layer 26 and other parts (the protrusion 23, the substrate 21). contact area and adhesion, reduce the stress caused by heat expansion and contraction, and increase the path length of water vapor and oxygen penetration, thereby slowing down the rate of water vapor and oxygen intrusion.

third embodiment

As shown in FIG. 11 and FIG. 12, the organic light emitting display panel 3 according to the third embodiment of the present invention includes a substrate 31, at least one organic light emitting region 32, at least one protective layer 33 and at least one barrier layer 34, wherein the organic The light emitting region 32 is formed on the substrate 31, and the organic light emitting region 32 has a plurality of pixels 321; the protective layer 33 is formed on the substrate 31 and the organic light emitting region 32; the barrier layer 34 is formed on the protective layer 33 and the substrate 31, And one of the protection layers 33 and/or one of the barrier layers 34 ( 341 , 342 , 343 ) are formed by photochemical vapor deposition.

In this embodiment, the pixel 321 sequentially includes a first electrode 3211 , at least one organic functional layer 3212 and a second electrode 3213 , and the first electrode 3211 is located on the substrate 31 .

In this embodiment, the features and functions of the substrate 31, the organic light emitting region 32, the pixel 321, the first electrode 3211, the organic functional layer 3212, the second electrode 3213, the protective layer 33 and the barrier layers 34, 341, 342, 343 are all The same elements as those in the first embodiment will not be repeated here.

In this embodiment, a sealing layer (not shown in the figure) may be further included to cover the barrier layer 34 and the substrate 31 .

The organic light-emitting display panel of the present invention uses a barrier layer or a sealing layer to prevent moisture and oxygen from invading from the front and side of the device. Compared with the prior art, the barrier layer or sealing layer of the present invention is formed on the protective layer and the substrate, which can prevent moisture and oxygen from penetrating from the edge of the protective layer to the inside of the element. At the same time, the protective layer can prevent discontinuity of the subsequently formed barrier layer or sealing layer, and further prevent moisture and oxygen from entering the element through the pores. In addition, the protrusions of the present invention make the sealing layer present a wavy structure, which not only increases the contact area and adhesion between the sealing layer and other parts (protrusions, substrates), but also reduces the stress caused by thermal expansion and contraction , it can increase the path length of water vapor and oxygen penetration, so as to slow down the rate of water vapor and oxygen intrusion. Furthermore, the multi-layer barrier layer of the present invention can stagger the positions of the pores between the barrier layers, effectively compensating for the defects of the film layer. Furthermore, the barrier layer in the present invention can be composed of barrier layers with different Young's modulus, and the barrier layer with lower Young's modulus is sandwiched between the barrier layers with higher Young's modulus to produce The role of the buffer to reduce the stress between the barrier layers. In addition, the flat layer, barrier layer or sealing layer can be formed by photochemical vapor deposition, which can not only provide sufficient film formation rate at low temperature (below about 300 ° C), but also, due to the formation of low temperature The film structure is relatively loose, which can reduce the internal stress of the film layer and reduce the possibility of peeling off the film layer.

The above descriptions are illustrative only, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the appended patent application.

Claims (11)

1. An organic light-emitting display panel, characterized in that it comprises: a substrate; At least one organic light-emitting area is formed on the substrate, and the organic light-emitting area has several pixels; At least one protrusion is directly formed on the surface of the substrate where the organic light-emitting region is not formed; At least one protective layer is formed on the substrate and the organic light-emitting region; at least one barrier layer formed on the protective layer and/or the protrusion; and An encapsulation layer is formed on the substrate and the protruding part, and covers at least the periphery of the barrier layer and/or the protection layer. 2. The organic light emitting display panel as claimed in claim 1, wherein the pixel sequentially comprises a first electrode, at least one organic functional layer and a second electrode. 3. The organic light emitting display panel as claimed in claim 1, wherein a cross-section of the protruding portion is a trapezoid or a rectangle. 4. The organic light emitting display panel as claimed in claim 1, wherein a material of the protrusion is a waterproof material. 5. The organic light emitting display panel as claimed in claim 1, wherein the protective layer, the barrier layer and the sealing layer are made of inorganic materials. 6. The organic light emitting display panel as claimed in claim 5, wherein the protective layer is at least one selected from silicon oxide, diamond-like carbon film, silicon nitride, silicon oxynitride and aluminum oxide. 7. The organic light-emitting display panel according to claim 5, wherein the barrier layer and the sealing layer are respectively selected from at least one of silicon oxide, silicon nitride, diamond-like film, silicon oxynitride, aluminum oxide and metal . 8. The organic light emitting display panel as claimed in claim 1, wherein at least one layer of the protective layer is formed by photochemical vapor deposition or sputtering. 9. The organic light emitting display panel as claimed in claim 1, wherein the barrier layer and/or the sealing layer are waterproof. 10. The organic light emitting display panel as claimed in claim 1, wherein at least one of the barrier layers has buffer properties. 11. The organic light emitting display panel as claimed in claim 1, wherein at least one of the barrier layers is formed by photochemical vapor deposition or sputtering.

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