OLED display panel

Abstract

The present invention provides an OLED display panel, which comprises a substrate, a pixel definition layer located on the substrate, a light emitting device located in a pixel opening of the pixel definition layer, a light gain layer located on the light emitting device, a packaging layer located on the light gain layer, and a color filter layer located on the packaging layer; wherein the light emitting device comprises an anode layer, a light emitting functional layer located on the anode layer, and a cathode layer located on the light emitting functional layer; a black photoresist layer is arranged on the anode slopes at the ends of the anode layer; because the present invention covers the anode slopes with the black photoresist layer, dispersion of external light by the anode slopes is avoided, thereby improving the display quality of the OLED display panel.

Description

Technical Field

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

[0002] The pixel units of full-color OLED display panels currently on the market are composed of three primary colors: red, green, and blue. According to the principle of three primary colors, various colors can be generated by controlling the red, green, and blue monochrome gray levels of sub-pixel units, thereby displaying color images.

[0003] In order to prevent the reflection of the OLED display panel, a layer of polarizer needs to be set on the light-emitting side. The polarizer uses the principle of polarized light to effectively reduce the reflection intensity of the external ambient light on the screen. However, the transmittance of the polarizer is only about 40%. In order to achieve a higher light output brightness, more power consumption is required, and the price of the polarizer is relatively expensive. In addition, the attachment of the polarizer requires manual or automatic machine operation. At the same time, due to problems in the operation process, a certain number of defective films appear, and there are dust, bubbles in the film, crooked polarizers, etc. The process is difficult, the production yield and efficiency are insufficient, and the production cost of OLED display panels is further increased.

[0004] Based on the above reasons, panel manufacturers in the display industry are using color-blocking layers to replace non-polarized technology to reduce power consumption. Without the reflection suppression of polarizers, the reduction in the reflectivity of color filters is usually achieved through a black matrix. The RGB color film itself has a certain reflectivity, but it cannot completely prevent external light from entering the OLED display panel. After some external light enters the OLED display panel, it will be dispersed at the anode below the slope of the pixel opening (anode slope), which is particularly obvious when used outdoors and needs to be improved. Summary of the invention

[0005] Based on the problems of the prior art, the present application provides an OLED display panel, which can solve the problem of using a color resist layer and a black matrix to replace a polarizer made of polyvinyl alcohol in the prior art, thereby playing the role of thinning the polarizer. Since the RGB color film itself has a certain reflectivity, it cannot completely prevent external light from entering the OLED display panel. In an outdoor environment, after some external light enters the OLED display panel, it will be dispersed at the anode below the slope of the pixel opening (anode slope), affecting the display quality of the OLED display panel.

[0006] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0007] An embodiment of the present invention provides an OLED display panel, which includes a substrate, a pixel definition layer located on the substrate and a light-emitting device located in a pixel opening of the pixel definition layer, a light gain layer located on the light-emitting device, an encapsulation layer located on the light gain layer, and a color filter layer located on the encapsulation layer.

[0008] The light-emitting device at least includes an anode layer, a light-emitting functional layer located above the anode layer, and a cathode layer located above the light-emitting functional layer; wherein a black photoresist layer is arranged at the edge of the anode layer, and the black photoresist layer is arranged to avoid the pixel opening.

[0009] According to a preferred embodiment of the present invention, the black photoresist layer is located between the anode layer and the pixel definition layer, and the pixel definition layer covers the black photoresist layer.

[0010] According to a preferred embodiment of the present invention, the black photoresist layer is located on the pixel definition layer, and in the film thickness direction of the OLED display panel, the projection of the black photoresist layer is located within the pixel definition layer.

[0011] According to a preferred embodiment of the present invention, the black photoresist layer is in a closed ring structure.

[0012] According to a preferred embodiment of the present invention, the black photoresist layer includes a base film and at least one material of nano carbon black, graphene and carbon nanotubes uniformly doped in the base film; the base film is an epoxy resin glue layer or a silicone layer.

[0013] According to a preferred embodiment of the present invention, the light gain layer is an organic material layer with a refractive index of 1.8 to 2.1.

[0014] According to a preferred embodiment of the present invention, a hole injection layer and a hole transport layer are further provided between the anode layer and the light-emitting functional layer, and an electron injection layer and an electron transport layer are provided between the light-emitting functional layer and the cathode layer; wherein the material of the hole injection layer and the hole transport layer is copper phthalocyanine (CuPc) or diphenyl phthalocyanine (C 44 H 32 N2), the material of the electron injection layer and the electron transport layer is lithium fluoride (LiF); the material of the cathode layer is one or more combination materials of silver (Ag), gold (Au), aluminum (Al) and magnesium (Mg), and the material of the anode layer is transparent ITO.

[0015] According to a preferred embodiment of the present invention, a protective cover is further provided on a side of the color filter layer away from the encapsulation layer, and the protective cover includes a glass cover and a filling layer and a frame glue layer located on the glass cover, wherein the frame glue layer is arranged around the edge of the filling layer, and the frame glue layer is filled with a dry material, and the dry material is one or more of transparent silicon dioxide, zirconium dioxide, titanium dioxide, calcium oxide and calcium nitride.

[0016] According to a preferred embodiment of the present invention, the color filter layer includes a color resist layer arranged in alignment with the light-emitting device, and a light-shielding matrix located between the color resist layers.

[0017] According to a preferred embodiment of the present invention, the substrate includes TFT devices arranged in an array, the anode layer is electrically connected to the drain of the TFT device through a via, the source of the TFT device is electrically connected to the positive pole of an external power supply, and the cathode layer is electrically connected to the negative pole of the external power supply.

[0018] Beneficial effects of the present invention: An embodiment of the present invention provides an OLED display panel, which includes a substrate, a pixel definition layer located on the substrate and a light-emitting device located in a pixel opening of the pixel definition layer, a light gain layer located on the light-emitting device, a packaging layer located on the light gain layer, and a color filter layer located on the packaging layer; wherein the light-emitting device includes an anode layer, a light-emitting functional layer located on the anode layer, and a cathode layer located on the light-emitting functional layer; a black photoresist layer is provided on the anode slopes at the ends of the anode layer; because the present invention covers the anode slopes with the black photoresist layer, dispersion of external light by the anode slopes is avoided, thereby improving the display quality of the OLED display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A structural schematic diagram of an OLED display panel is provided for the present invention.

[0021] Figure 2 Another structural schematic diagram of an OLED display panel is provided for the present invention.

[0022] Figure 3 Another structural schematic diagram of an OLED display panel is provided for the present invention.

[0023] Figure 4 The present invention provides a schematic top view of the structure of a black photoresist layer of an OLED display panel.

[0024] Figure 5 A schematic diagram of a film layer structure of a protective cover plate of an OLED display panel is provided in the present invention.

[0025] Figure 6 A schematic top view of the structure of a protective cover plate of an OLED display panel is provided for the present invention. DETAILED DESCRIPTION

[0026] The following descriptions of the embodiments are made with reference to the attached diagrams to illustrate specific embodiments in which the present invention may be implemented. The directional terms mentioned in the present invention, such as [up], [down], [front], [back], [left], [right], [inside], [outside], [side], etc., are only with reference to the directions of the attached diagrams. Therefore, the directional terms used are used to illustrate and understand the present invention, rather than to limit the present invention. In the figures, units with similar structures are represented by the same reference numerals, and the dotted lines in the figures represent those that do not exist in the structure and only illustrate the shape and position of the structure.

[0027] The present invention aims at the problem that the polarizer made of polyvinyl alcohol is replaced by a color resist layer and a black matrix in the prior art, and plays the role of thinning the polarizer. Since the RGB color film itself has a certain reflectivity, it cannot completely prevent external light from entering the OLED display panel. In outdoor environments, after part of the external light enters the OLED display panel, it will be dispersed at the anode (anode slope) below the slope of the pixel opening, affecting the display quality of the OLED display panel. The present invention can solve the above technical defects.

[0028] In order to solve the above technical problems, an embodiment of the present invention provides an OLED display panel, which includes a substrate, a pixel definition layer located on the substrate and a light-emitting device located in a pixel opening of the pixel definition layer, a light gain layer located on the light-emitting device, a packaging layer located on the light gain layer, and a color filter layer located on the packaging layer; the light-emitting device at least includes an anode layer, a light-emitting functional layer located on the anode layer, and a cathode layer located on the light-emitting functional layer; wherein a black photoresist layer is arranged at an edge of the anode layer, and the black photoresist layer is arranged to avoid the pixel opening; since the edge portion of the anode layer is covered with the black photoresist layer, the dispersion of the anode edge to external light is avoided, thereby improving the display quality of the OLED display panel.

[0029] The pixel opening of the present embodiment has a top opening and a bottom opening, the bottom opening is formed in the top opening, each of the light-emitting devices has a slope formed from the top opening to the bottom opening, a black photoresist layer is arranged on the portion of the anode layer located in the slope, and the black photoresist layer is staggered with the pixel opening; the portion of the anode layer located in the slope is referred to as the anode slope. Since the present invention covers the anode portion located below the side slope of the pixel opening with a black photoresist layer, the dispersion of external light by the anode slope is avoided, thereby improving the display quality of the OLED display panel.

[0030] Specifically, Figure 1 As shown, the present invention provides a structural schematic diagram of an OLED display panel. The OLED display panel 10 includes a substrate 11, an anode layer located on the substrate 11, a functional film layer 18 located on the anode layer, a color filter layer 20 located on the functional film layer 18, an optical adhesive layer 24 located on the color filter layer 20, and a protective cover plate 25 located on the optical adhesive layer 24, the color filter layer 20 includes a color resist layer arranged in alignment with the light-emitting device, and a light-shielding matrix 23 located between the color resist layers, such as a color resist layer 21 and a color resist layer 22; the ends of the anode layer on both sides in this embodiment are referred to as anode slopes, and a black photoresist layer is arranged on the anode slope, and the black photoresist layer is preferably a black matrix, and the black photoresist layer is staggered with the pixel opening. For example, the anode slopes at both ends of the anode layer 12 are respectively provided with a black photoresist layer 13 and a black photoresist layer 14, and the anode slopes at both ends of the anode layer 15 are respectively provided with a black photoresist layer 16 and a black photoresist layer 17. The functional film layer 18 of this embodiment is described in detail in the figure. The functional film layer 18 includes a light-emitting device film layer, a light gain layer located on the surface of the light-emitting device film layer, and a packaging layer located on the light gain layer. The color filter layer 20 and the cover layer 25 are also provided with a touch layer. The substrate 11 of this embodiment includes an array of TFT devices, the anode layer is electrically connected to the drain of the TFT device through a via, the source of the TFT device is electrically connected to the positive electrode of the external power supply, and the cathode layer is electrically connected to the negative electrode of the external power supply. Figure 2 There is no optical adhesive layer between the color filter layer 20 and the protective cover plate 25, and the other structures are similar to Figure 1 Similar, no further description is given here.

[0031] like Figure 3As shown, the present invention provides another structural schematic diagram of an OLED display panel, the OLED display panel 100 includes a substrate 101, a pixel definition layer located on the substrate 101 and a light-emitting device located in a pixel opening of the pixel definition layer, a light gain layer 112 located on the light-emitting device, an encapsulation layer 113 located on the light gain layer 112, a color filter layer 114 located on the encapsulation layer 113, and a protective cover plate 115 located on the color filter layer 114. The encapsulation layer 113 is a film layer stacked with organic and inorganic film layers; the color filter layer 114 includes a color resist layer 1141 arranged in alignment with the light-emitting device, and a light shielding matrix 1142 located between the color resist layers 1141. The light-emitting device at least includes an anode layer 102, a light-emitting functional layer 107 located on the anode layer 102, and a cathode layer 111 located on the light-emitting functional layer 107.

[0032] The pixel definition layers are arranged at intervals to form a pixel opening, for example, the pixel definition layers 1041 and the pixel definition layers 1042 are arranged at intervals to form a pixel opening, the cross-sectional shape of the pixel opening is an inverted trapezoid, the pixel opening has a top opening and a bottom opening, the bottom opening is formed in the top opening, each of the light-emitting devices has a slope formed from the top opening to the bottom opening, the part of the anode layer located on the slope is referred to as the anode slope, and a black photoresist layer 103 is arranged on the anode slope at the end of the anode layer 102, and the black photoresist layer 103 is arranged in a staggered manner with the pixel opening. For example, there are anode slopes 1021 and anode slopes 1022 at both ends of the anode layer 102, a black photoresist layer 1031 is arranged on the anode slope 1021, and a black photoresist layer 1032 is arranged on the anode slope 10221. The black photoresist layer 103 in this embodiment is located between the anode layer 102 and the pixel definition layer, and the pixel definition layer covers the light shielding layer 103. The black photoresist layer 1031 is located between the anode slope 1021 and the pixel definition layer 1031, and the black photoresist layer 1032 is located between the anode slope 1022 and the pixel definition layer 1032, so that the black photoresist layer can fully cover the anode portion located below the side slope of the pixel opening to avoid the dispersion of external light by the anode slope, thereby improving the display quality of the OLED display panel.

[0033] Figure 4 Combination Figure 3In this embodiment, one side of the black photoresist layer 103 is attached to the slope of the anode layer, and the other side extends into the pixel definition layer. The black photoresist layer 103 is a closed ring structure. The cross-sectional width L1 of the black photoresist layer 103 is preferably 0.1 mm to 2 mm. The width of the anode slope at the end of the anode layer 102 is L2, and L1 is greater than L1. The material of the black photoresist layer 103 is preferably a black matrix photoresist material. In another embodiment, the black photoresist layer 103 includes a base film and at least one material of nano carbon black, graphene and carbon nanotubes uniformly doped in the base film; the base film is an epoxy resin glue layer or a silicone layer.

[0034] like Figure 3 As shown, in this embodiment, a hole injection layer 105 and a hole transport layer 106 are further provided between the anode layer 102 and the light-emitting functional layer 107, and an electron injection layer 108 and an electron transport layer 109 are provided between the light-emitting functional layer 107 and the cathode layer 111; wherein the material of the hole injection layer 105 and the hole transport layer 106 is copper phthalocyanine (CuPc) or diphenyl phthalocyanine (C 44 H 32 N2), the materials of the electron injection layer 109 and the electron transport layer 108 are lithium fluoride (LiF); the material of the cathode layer 111 is one or more combination materials of silver (Ag), gold (Au), aluminum (Al) and magnesium (Mg), the material of the anode layer 102 is transparent ITO; the light gain layer 112 is an organic material layer with a refractive index of 1.8 to 2.1.

[0035] The substrate 101 includes TFT devices arranged in an array, the anode layer 102 is electrically connected to the drain of the TFT device through a via, the source of the TFT device is electrically connected to the positive electrode of an external power supply, and the cathode layer 111 is electrically connected to the negative electrode of the external power supply, so as to realize normal light emission of the light-emitting device of the OLED display panel.

[0036] In another embodiment, the black photoresist layer 103 is located above the pixel definition layer. In the film thickness direction of the OLED display panel, the projection of the black photoresist layer 103 is located within the pixel definition layer, so that the black photoresist layer 103 covers the anode portion below the side slope of the pixel opening, avoiding the dispersion of external light by the anode slope, thereby improving the display quality of the OLED display panel.

[0037] like Figure 5 and Figure 6As shown, a protective cover plate 115 is further provided on the side of the color filter layer 114 away from the encapsulation layer 113, and the protective cover plate 115 includes a glass cover plate 1153 and a filling layer 1151 and a frame glue layer 1152 located on the glass cover plate 1153, and the filling layer 1151 and the frame glue layer 1152 are arranged near the light-emitting device. The frame glue layer 1152 is arranged around the edge of the filling layer 1151, and the frame glue layer 1152 is filled with a dry material, and the dry material is one or more materials selected from transparent silicon dioxide, zirconium dioxide, titanium dioxide, calcium oxide and calcium nitride.

[0038] According to the OLED display panel of the above embodiment, the present invention further provides a method for preparing an OLED display panel, the method comprising:

[0039] Step S1, providing a substrate, preparing an anode layer on the substrate, wherein the substrate includes TFT devices arranged in an array, the anode layer is electrically connected to the drain of the TFT device through a via, and the source of the TFT device is electrically connected to the positive electrode of an external power supply.

[0040] Step S2, preparing a black photoresist layer on the anode slope at the end of the anode layer, then preparing a pixel definition layer on the substrate, and preparing a light-emitting functional layer and a cathode layer in the opening of the pixel definition layer; wherein the cathode layer is electrically connected to the negative pole of the external power supply.

[0041] Step S3, preparing a light gain layer on the cathode layer, preparing an encapsulation layer on the light gain layer, preparing a color filter layer on the encapsulation layer, and preparing a protective cover plate on the color filter layer.

[0042] Preferably, step S3 further comprises: a touch layer is prepared between the color filter layer and the protective cover plate.

[0043] Preferably, the black photoresist layer in step S2 is a black matrix; or, the black photoresist layer includes a base film and at least one material of nano carbon black, graphene and carbon nanotubes uniformly doped in the base film; the base film is an epoxy resin glue layer or a silicone layer.

[0044] An embodiment of the present invention provides an OLED display panel, which includes a substrate, a pixel definition layer located on the substrate, a light-emitting device located in a pixel opening of the pixel definition layer, a light gain layer located on the light-emitting device, a packaging layer located on the light gain layer, and a color filter layer located on the packaging layer; wherein the light-emitting device includes an anode layer, a light-emitting functional layer located on the anode layer, and a cathode layer located on the light-emitting functional layer; a black photoresist layer is provided on the anode slopes at the ends of the anode layer; because the present invention covers the anode slopes with the black photoresist layer, dispersion of external light by the anode slopes is avoided, thereby improving the display quality of the OLED display panel.

[0045] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. An OLED display panel, characterized in that: The invention comprises a substrate, a pixel definition layer located on the substrate, a light emitting device located in a pixel opening of the pixel definition layer, a light gain layer located on the light emitting device, a packaging layer located on the light gain layer, and a color filter layer located on the packaging layer; The light emitting device at least comprises an anode layer, a light emitting functional layer located on the anode layer, and a cathode layer located on the light emitting functional layer; wherein a black photoresist layer is arranged at an edge of the anode layer, and the black photoresist layer is arranged to avoid a pixel opening; The black photoresist layer is located between the anode layer and the pixel definition layer, and the pixel definition layer covers the black photoresist layer, and the black photoresist layer is in a closed ring structure; The optical gain layer is partially located on the pixel definition layer and partially located in the pixel opening; The light gain layer is an organic material layer with a refractive index of 1.8 to 2.

1.

2. The OLED display panel according to claim 1, characterized in that: The black photoresist layer comprises a base film and at least one material of nano carbon black, graphene and carbon nanotubes uniformly doped in the base film; the base film is an epoxy resin glue layer or a silicone layer.

3. The OLED display panel according to claim 1, characterized in that: A hole injection layer and a hole transport layer are further provided between the anode layer and the light-emitting functional layer, and an electron injection layer and an electron transport layer are provided between the light-emitting functional layer and the cathode layer; wherein the material of the hole injection layer and the hole transport layer is copper phthalocyanine (CuPc) or diphenyl phthalocyanine (C 44 H 32 N2), the material of the electron injection layer and the electron transport layer is lithium fluoride (LiF); the material of the cathode layer is one or more combination materials of silver (Ag), gold (Au), aluminum (Al) and magnesium (Mg), and the material of the anode layer is transparent ITO.

4. The OLED display panel according to claim 1, characterized in that: A protective cover is also provided on the side of the color filter layer away from the encapsulation layer, and the protective cover includes a glass cover and a filling layer and a frame glue layer located on the glass cover, wherein the frame glue layer is arranged around the edge of the filling layer, and the frame glue layer is filled with a dry material, and the dry material is one or more materials selected from transparent silicon dioxide, zirconium dioxide, titanium dioxide, calcium oxide and calcium nitride.

5. The OLED display panel according to claim 1, characterized in that: The color filter layer includes a color resist layer arranged in alignment with the light emitting device, and a light shielding matrix located between the color resist layers.

6. The OLED display panel according to claim 1, characterized in that: The substrate includes TFT devices arranged in an array, the anode layer is electrically connected to the drain of the TFT device through a via, the source of the TFT device is electrically connected to the positive electrode of an external power supply, and the cathode layer is electrically connected to the negative electrode of the external power supply.

Images