OLED panel

Abstract

The utility model relates to an OLED panel, which comprises a substrate and a composite anode structure arranged on the substrate, and the composite anode structure comprises a first molybdenum metal layer, a graphene layer, a second molybdenum metal layer, an Mg-Ag co-evaporation film layer and an ITO layer which are sequentially laminated on the substrate. The composite anode structure provided by the utility model has high conductivity, can significantly reduce the square resistance of an anode circuit, reduces the voltage drop, and improves the brightness display uniformity of an OLED. The specific laminated structure of the first molybdenum metal layer, the graphene layer and the second molybdenum metal layer can quickly conduct heat of an OLED display area to the outside in the process of continuously releasing heat when the OLED is lightened, so that the service life of the OLED is prolonged; the graphene layer has a low thermal expansion coefficient, so that the composite anode structure can maintain good stability in a high-temperature working environment or a high-temperature process flow, and poor display caused by stripping of the composite anode structure is prevented.

Description

Technical Field

[0001] The utility model relates to the field of display technology, in particular to an OLED panel. Background Art

[0002] The OLED panel is an advanced display technology that uses organic light-emitting diodes to generate images. The basic components of an OLED usually include a substrate, an anode, a hole transport layer, a light-emitting layer, an electron transport layer, and a cathode. Among them, the substrate is the foundation, usually made of transparent plastic, glass, or metal foil, which is used to support the entire OLED structure and helps with the transmission of electrons and holes; the anode is the first electrode of the OLED, usually transparent so that light can pass through; when current flows through the device, the role of the anode is to eliminate electrons, thereby increasing the "holes" of electrons. In the OLED anode circuit, the material and structure of the anode have an important impact on the stability of the OLED device and the brightness uniformity of the OLED.

[0003] The current anode structure has problems such as poor conductivity, large sheet resistance, and significant OLED display brightness non-uniformity caused by the circuit voltage drop. In addition, the anode has poor thermal conductivity, the device heat dissipation is not fast enough, and the thermal stability requirements for the device materials are also relatively high. Moreover, the thermal expansion coefficient of the anode material is relatively large, and in a high-temperature environment or high-temperature process flow, it is easy to cause film layer peeling, resulting in poor device display and reducing the product yield. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an OLED panel with uniform display brightness, fast heat dissipation, and stable structure in view of the current situation of the prior art.

[0005] The technical solution adopted by the utility model to solve the above technical problem is: an OLED panel, including a substrate and a composite anode structure disposed on the substrate, the composite anode structure includes a first molybdenum metal layer, a graphene layer, a second molybdenum metal layer, a Mg-Ag co-evaporated film layer, and an ITO layer sequentially stacked on the substrate.

[0006] In order to prevent ions on the substrate from interfering with the OLED device, a SiC film layer is provided between the substrate and the composite anode structure. The SiC film layer can separate the residual ions inside the substrate from the composite anode structure, preventing the ions on the substrate from interfering with the OLED device; at the same time, SiC has good wear resistance and low thermal expansion coefficient, which is beneficial to the deposition preparation of subsequent film layers and prevents film layer peeling.

[0007] Preferably, the thickness of the SiC film layer is 3-10 μm.

[0008] Preferably, a pixel defining layer is further included. The pixel defining layer (4) vertically penetrates the composite anode structure and its upper end protrudes above the ITO layer (25). With the above structure, the display effect of the OLED panel is improved.

[0009] Preferably, the lateral thickness of the pixel defining layer is 6 - 15 μm.

[0010] In order to further improve the display effect of the OLED panel, the pixel defining layer includes a light-absorbing black insulating glue layer and a first transparent insulating glue layer and a second transparent insulating glue layer respectively arranged on the left and right sides of the light-absorbing black insulating glue layer.

[0011] Preferably, both the first transparent insulating glue layer and the second transparent insulating glue layer contain scattering particles. In the pixel defining layer with a sandwich structure, the scattering particles added in the transparent insulating glue layer can scatter most of the light to the pixel opening for light emission, reducing the total internal reflection of light inside the device; the light-absorbing black insulating glue layer can absorb a small amount of light leaking laterally, preventing crosstalk between pixels from causing poor OLED display.

[0012] The scattering particles of the present utility model include one or more of TiO2 nanoparticles, SiO2 nanoparticles, and Ag nanoparticles. The doping volume percentage of the scattering particles is 3% - 5%.

[0013] Preferably, the thicknesses of both the first molybdenum metal layer and the second molybdenum metal layer are 50 - 100 nm; the thickness of the graphene layer is 50 - 150 nm; the thickness of the Mg-Ag co-evaporated film layer is 100 - 200 nm; the thickness of the ITO layer is 5 - 50 nm.

[0014] The substrate of the present utility model is selected from a silicon plate, a glass plate, a sapphire plate, a PI plate, a PET plate, or a PVC plate.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] The composite anode structure composed of the first molybdenum metal layer, the graphene layer, the second molybdenum metal layer, the Mg-Ag co-evaporated film layer, and the ITO layer can greatly improve the conductivity, significantly reduce the sheet resistance of the anode circuit, reduce the voltage drop, and improve the OLED brightness display uniformity;

[0017] Meanwhile, the first molybdenum metal layer, the graphene layer, and the second molybdenum metal layer all have very good thermal conductivity. The three are arranged in a specific laminated manner, and during the process of continuously releasing heat when the OLED is lit, the heat in the OLED display area can be quickly conducted to the outside, improving the service life of the OLED;

[0018] Moreover, the graphene layer has a low coefficient of thermal expansion. In a high-temperature working environment or high-temperature process flow, the composite anode structure can also maintain good stability, preventing the composite anode structure from peeling off and causing poor display. Brief Description of the Drawings

[0019] Figure 1 It is a partial structural schematic diagram of the OLED panel in the embodiment of the present invention. Detailed Embodiment

[0020] The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

[0021] As Figure 1 shown is a preferred embodiment of the OLED panel of the present invention. The OLED panel includes a substrate 1, a SiC film layer 3, a composite anode structure, and a pixel defining layer 4.

[0022] The substrate 1 can be made of flexible material or rigid material, and can specifically be selected from a silicon plate, a glass plate, a sapphire plate, a PI plate, a PET plate, or a PVC plate, etc.

[0023] A SiC film layer 3 with a thickness of 3 - 10 μm is provided on the substrate 1, and a composite anode structure is provided on the SiC film layer 3. The SiC film layer can separate the residual ions inside the substrate 1 from the composite anode structure, preventing the ions on the substrate from interfering with the OLED device; at the same time, SiC has good wear resistance and a low coefficient of thermal expansion, which is beneficial to the deposition preparation of subsequent film layers and prevents the film layers from peeling off.

[0024] The composite anode structure of the present application includes a first molybdenum metal layer 21, a graphene layer 22, a second molybdenum metal layer 23, a Mg - Ag co-evaporated film layer 24, and an ITO layer 25 that are sequentially stacked on the SiC film layer 3; specifically, the thicknesses of the first molybdenum metal layer 21 and the second molybdenum metal layer 23 are both 50 - 100 nm; the thickness of the graphene layer 22 is 50 - 150 nm; the thickness of the Mg - Ag co-evaporated film layer 24 is 100 - 200 nm; the thickness of the ITO layer 25 is 5 - 50 nm. The composite anode structure composed of the first molybdenum metal layer 21, the graphene layer 22, the second molybdenum metal layer 23, the Mg - Ag co-evaporated film layer 24, and the ITO layer 25 can significantly reduce the sheet resistance of the anode circuit, reduce the voltage drop, and improve the brightness display uniformity of the OLED by utilizing the high electrical conductivity of each layer of material; at the same time, the first molybdenum metal layer 21, the graphene layer 22, and the second molybdenum metal layer 23 all have very good thermal conductivity. During the process of continuous heat release when the OLED is lit, the heat in the OLED display area can be quickly conducted to the outside, improving the service life of the OLED; moreover, the graphene layer 22 has a low coefficient of thermal expansion. In a high-temperature working environment or high-temperature process flow, the composite anode structure can also maintain good stability, preventing anode peeling and causing poor display.

[0025] After the composite anode structure is formed, an anode circuit is prepared on the composite anode structure through processes such as cleaning, coating with glue, baking, exposure, development, and etching. Then, a pixel definition layer 4 is prepared on the anode circuit through processes such as coating with glue, baking, exposure, and development. The pixel definition layer 4 vertically penetrates the composite anode structure and its upper end protrudes above the ITO layer 25. The lateral thickness of the pixel definition layer 4 is 6 - 15 μm.

[0026] To improve the display effect of the OLED panel, the pixel definition layer 4 includes a light-absorbing black insulating glue layer 41, a first transparent insulating glue layer 42, and a second transparent insulating glue layer 43 respectively arranged on the left and right sides of the light-absorbing black insulating glue layer 41. Among them, both the first transparent insulating glue layer 42 and the second transparent insulating glue layer 43 contain scattering particles 44 with a doping volume percentage of 3% - 5%. The scattering particles 44 include one or more of TiO2 nanoparticles, SiO2 nanoparticles, and Ag nanoparticles. In the pixel definition layer 4 with a sandwich structure, the scattering particles added in the transparent insulating glue layer can scatter most of the light to the pixel opening for light emission, reducing total internal reflection of light inside the device; the light-absorbing black insulating glue layer 41 can absorb a small amount of light leaking laterally, preventing crosstalk between pixels from causing poor OLED display.

Claims

1. An OLED panel, comprising a substrate (1) and a composite anode structure arranged on the substrate (1), characterized in that: The composite anode structure comprises a first molybdenum metal layer (21), a graphene layer (22), a second molybdenum metal layer (23), a Mg-Ag co-evaporated film layer (24) and an ITO layer (25) which are sequentially stacked on the substrate (1).

2. The OLED panel according to claim 1, characterized in that: A SiC film layer (3) is provided between the substrate (1) and the composite anode structure.

3. The OLED panel according to claim 2, characterized in that: The thickness of the SiC film layer (3) is 3 to 10 μm.

4. The OLED panel according to claim 1, characterized in that: It also comprises a pixel defining layer (4), wherein the pixel defining layer (4) vertically passes through the composite anode structure and the upper end thereof protrudes above the ITO layer (25).

5. The OLED panel according to claim 4, characterized in that: The pixel defining layer (4) has a lateral thickness of 6 to 15 μm.

6. The OLED panel according to claim 5, characterized in that: The pixel defining layer (4) comprises a light-absorbing black insulating adhesive layer (41) and a first transparent insulating adhesive layer (42) and a second transparent insulating adhesive layer (43) respectively arranged on the left and right sides of the light-absorbing black insulating adhesive layer (41).

7. The OLED panel according to claim 6, characterized in that: The first transparent insulating adhesive layer (42) and the second transparent insulating adhesive layer (43) both contain scattering particles (44).

8. The OLED panel according to any one of claims 1 to 7, characterized in that: The thickness of the first molybdenum metal layer (21) and the second molybdenum metal layer (23) are both 50 to 100 nm; the thickness of the graphene layer (22) is 50 to 150 nm; the thickness of the Mg-Ag co-evaporated film layer (24) is 100 to 200 nm; and the thickness of the ITO layer (25) is 5 to 50 nm.

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