CN110085762B - OLED display panel and display device - Google Patents
OLED display panel and display device Download PDFInfo
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- CN110085762B CN110085762B CN201910301271.3A CN201910301271A CN110085762B CN 110085762 B CN110085762 B CN 110085762B CN 201910301271 A CN201910301271 A CN 201910301271A CN 110085762 B CN110085762 B CN 110085762B
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- H10K50/00—Organic light-emitting devices
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- H10K50/805—Electrodes
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H10K59/12—Active-matrix OLED [AMOLED] displays
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Abstract
The invention provides an OLED display panel and a display device, belonging to the technical field of flexible display, wherein the OLED display panel comprises an array substrate, a plurality of light-emitting units positioned on the array substrate, a pixel definition layer for isolating the light-emitting units, a thin film packaging layer positioned on the pixel definition layer, and a filter layer positioned on the thin film packaging layer; the filter layer comprises a plurality of optical filters corresponding to the plurality of light-emitting units, the pixel definition layer comprises a plurality of pixel openings, the light-emitting units comprise first electrodes, second electrodes and light-emitting layers arranged between the first electrodes and the second electrodes, the light-emitting layers are positioned in the pixel openings, the first electrodes are positioned between the light-emitting layers and the array substrate, and the second electrodes are positioned on one sides of the light-emitting layers, which are deviated from the array substrate; the part of the first electrode, which is positioned in the pixel opening, is provided with a through hole. The OLED display panel and the display device provided by the invention can reduce the reflection area of the anode to the external environment light and improve the display effect of the display panel.
Description
Technical Field
The invention relates to the technical field of flexible display, in particular to an OLED display panel and a display device.
Background
In the current OLED display panel, in order to improve the contrast of the OLED display panel, a polarizer is often prepared on a display device, and although the polarizer can improve the contrast of the OLED display panel, the polarizer has large thickness and strong brittleness, so that the thickness of the whole OLED display panel is increased, and the polarizer is not suitable for the flexible OLED display panel.
At present, a filter layer containing an optical filter and a black matrix is often adopted to replace the polarizer and is used for solving the problems of larger thickness and poorer flexibility of the polarizer. The filter layer comprises a black matrix and a plurality of optical filters arranged between the black matrix, the optical filters correspond to the light-emitting units in the OLED display panel one by one, and the color of light allowed to penetrate through the optical filters is the same as the color of display light emitted by the corresponding light-emitting units. When the external environment light enters the OLED display panel, the external environment light with different colors is filtered, and the contrast of the OLED display panel is improved.
However, since the same ambient light as the optical filter can still enter the OLED display panel through the optical filter, the ambient light entering the OLED display panel through the optical filter irradiates the anode, and the ambient light reflected by the anode interferes with the display image.
Disclosure of Invention
The embodiment of the invention provides an OLED display panel and a display device, which can reduce the reflection intensity of an anode to external environment light, reduce the interference of the external environment light to a display picture and improve the display effect of the display panel.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in one aspect, an embodiment of the present invention provides an OLED display panel, including an array substrate, a plurality of light emitting units disposed on the array substrate, a pixel defining layer for isolating each of the light emitting units, a thin film encapsulation layer disposed on the pixel defining layer, and a filter layer disposed on the thin film encapsulation layer; the filter layer comprises a plurality of optical filters which correspond to the light-emitting units one by one, and the color of light allowed to penetrate through the optical filters is the same as the light-emitting color of the corresponding light-emitting units; the pixel defining layer comprises a plurality of pixel openings, the light emitting unit comprises a first electrode, a second electrode and a light emitting layer arranged between the first electrode and the second electrode, the light emitting layer is positioned in the pixel openings, the first electrode is positioned between the light emitting layer and the array substrate, and the second electrode is positioned on one side of the light emitting layer, which is far away from the array substrate; the part of the first electrode, which is positioned in the pixel opening, is provided with at least one through hole.
Furthermore, the number of the through holes is multiple, and the through hole arrays are distributed in the first electrode.
Furthermore, the number of the through holes is multiple, and the through holes are distributed in the first electrode in a honeycomb shape.
Further, the cross section of the through hole is circular or regular hexagonal along a cross section parallel to the array substrate.
Further, the through hole is filled with a light absorption material.
Further, the pixel defining layer is made of the light absorbing material, or a light absorbing layer made of a light absorbing material is arranged on the pixel defining layer.
Further, the light absorption material is black organic glue, or acrylate or polyimide doped with black pigment.
Further, the first electrode is an anode, and the second electrode is a cathode; the plurality of second electrodes form an integral plate-like structure.
Further, the first electrode is of a multi-film structure, and the first electrode comprises two indium tin oxide layers and an electrode layer located between the two indium tin oxide layers.
According to another aspect of the embodiments of the present invention, there is provided a display device including the OLED display panel.
Compared with the prior art, the OLED display panel and the display device provided by the embodiment of the invention have the following advantages;
compared with the prior art, the OLED display panel and the display device provided by the embodiment of the invention have the advantages that the through holes are formed in the parts of the first electrodes, which are positioned in the pixel openings, so that the area of the surfaces, facing the optical filter, of the first electrodes is reduced, and the quantity of reflected light of external environment light on the first electrodes is reduced.
In addition to the technical problems solved by the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems solved by the display panel and the display device provided by the present invention, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description of the embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly described below, it is obvious that the drawings in the following description are only a part of the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first schematic diagram illustrating an internal structure of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an internal structure of a display panel according to an embodiment of the present invention;
FIG. 3 is a first top view of a first electrode according to an embodiment of the present invention;
fig. 4 is a second top view of the first electrode according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of filling a light absorbing material in a via hole of a first electrode according to an embodiment of the present disclosure;
fig. 6 is a schematic view of a manufacturing process of an OLED display panel according to an embodiment of the present invention.
Description of reference numerals:
10: an array substrate;
11: a substrate;
12: a thin film transistor layer;
20: a planarization layer;
30: a light emitting unit;
31: an anode;
32: a light emitting layer;
33: a cathode;
34: a through hole;
40: a pixel defining layer;
50: a thin film encapsulation layer;
60: a filter layer;
61: an optical filter;
62: and a black matrix.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an OLED display panel according to an embodiment of the present invention includes an array substrate 10, a plurality of light emitting units 30 disposed on the array substrate 10, a pixel defining layer 40 for isolating the light emitting units 30, a thin film encapsulation layer 50 disposed on the pixel defining layer 40, and a filter layer 60 disposed on the thin film encapsulation layer 50; the filter layer 60 includes a plurality of filters 61 corresponding to the plurality of light-emitting units 30 one by one, and the color of light allowed to pass through by the filters 61 is the same as the light-emitting color of the corresponding light-emitting units 30; the pixel defining layer 40 includes a plurality of pixel openings, the light emitting unit 30 includes a first electrode, a second electrode and a light emitting layer 32 disposed between the first electrode and the second electrode, the light emitting layer 32 is located in the pixel openings, the first electrode is located between the light emitting layer 32 and the array substrate 10, and the second electrode is located on a side of the light emitting layer 32 away from the array substrate 10; the portion of the first electrode located within the pixel opening is provided with at least one via 34.
Specifically, the array substrate 10 generally includes a substrate 11 and a thin-film transistor layer 12 disposed on the substrate 11, where the substrate 11 is generally a rigid substrate, such as a glass substrate; alternatively, the substrate 11 is a flexible substrate, such as a PI substrate. A planarization layer 20 is disposed on a side of thin-film transistor layer 12 away from substrate 11, and planarization layer 20 provides a flat molding base for light-emitting unit 30 and pixel defining layer 40. A plurality of light-emitting units 30 are disposed on a side of the planarization layer 20 away from the thin-film transistor layer 12, each light-emitting unit 30 includes a first electrode, a second electrode, and a light-emitting layer 32 located between the first electrode and the second electrode, the thin-film transistor layer 12 is electrically connected to one of the first electrode and the second electrode, and the thin-film transistor layer 12 controls the light-emitting layer 32 to emit light; the light emitting units 30 may include a red light emitting unit, a green light emitting unit, and a blue light emitting unit according to the emission color of the light emitting layer 32.
The array substrate 10 is further provided with a pixel defining layer 40 for isolating the light-emitting units 30, the pixel defining layer 40 is provided with a plurality of pixel openings, the light-emitting layer 32 is located in the pixel openings, the first electrode is arranged between the light-emitting layer 32 and the array substrate 10, and the second electrode is arranged on one side of the light-emitting layer 32, which is far away from the array substrate 10; for example, referring to fig. 1, the present embodiment may configure the first electrode as an anode 31, and the second electrode as a cathode 33; wherein the anode 31 and the thin film transistor layer 12 can be electrically connected; the anode 31 is disposed on the planarization layer 20 on one side and on the bottom of the pixel defining layer 40 on the other side, and a portion of the anode 31 is disposed in the pixel opening; a through hole 34 or a plurality of through holes 34 are formed in a part of the anode 31 positioned in the pixel opening, so that the area of the surface of the anode facing the optical filter is reduced, and the quantity of reflected light of external environment light on the anode is reduced. The cathode 33 is disposed in the pixel opening, and the cathode 33 is disposed on the light-emitting layer 32, so that the cathode 33 is disposed in the pixel opening, thereby saving the installation space of the cathode 33 and effectively reducing the overall thickness of the OLED panel.
It is understood that a via 34 can be provided on the portion of the anode within the pixel opening, and that the via 34 can be provided at the center of the portion of the anode within the pixel opening, or offset from the center of the portion of the anode within the pixel opening; in this embodiment, the position of the through hole 34 formed in the anode 31 is not limited, and the through hole 34 only needs to be located on a part of the anode in the pixel opening.
As shown in fig. 3 and 4, a portion of the anode electrode located within the pixel opening may be provided with a plurality of through holes 34, and the plurality of through holes 34 may be arranged in an array in the anode electrode 31 or in a honeycomb shape in the anode electrode 31; in the present embodiment, the shape of the through hole 34 is not limited, and the cross section of the through hole 34 along the cross section parallel to the array substrate 10 is circular or regular hexagonal or other regular patterns. In this embodiment, the plurality of through holes are distributed on the anode 31 in an array manner, or the plurality of through holes are distributed on the anode 31 in a honeycomb manner, and the intervals between the adjacent through holes are equal, so that the whole anode is uniform in electrical property.
The thin film encapsulation layer 50 is disposed on the pixel defining layer 40 and the cathode 33, and is used for protecting the structure of the OLED display panel located below the thin film encapsulation layer and preventing water and oxygen from eroding the internal structure of the OLED display panel, and the thin film encapsulation layer 50 is usually made of inorganic substances such as silicon oxide, silicon nitride, methacrylate and the like. A filter layer 60 is arranged on one side of the thin film packaging layer 50 away from the pixel defining layer 40, and the filter layer 60 comprises a plurality of optical filters 61 and a black matrix 62 positioned between two adjacent optical filters 61; the plurality of filters 61 are a red filter, a green filter and a blue filter respectively; the red filter is opposite to the red light-emitting unit, the green filter is opposite to the red light-emitting unit, and the blue filter is opposite to the blue light-emitting unit.
The filter 61 is configured to, when the external environment light irradiates the red filter, the green filter, and the blue filter, allow red light, green light, and blue light in the external environment light to enter the OLED display panel through the red filter, the green filter, and the blue filter, and prevent light of other colors from entering the OLED display panel; and a filter 61 for transmitting the display light emitted from the light emitting unit 30, which has the same color as the filter 61, to the outside of the OLED display panel.
When external environment light enters the inside of the OLED display panel through the optical filter 61 and irradiates the inside of the pixel opening, part of the anode 31 in the pixel opening is provided with through holes, so that the area of the surface of the anode facing the optical filter is reduced, the quantity of the external environment light reflected by the anode 31 and transmitted out of the OLED display panel is reduced, the interference of the external environment light on a display picture is reduced, and the display effect is improved.
As shown in fig. 2, an embodiment of the invention provides another OLED display panel, in which a pixel defining layer 40 is formed on a planarization layer 20, the pixel defining layer 40 is provided with a plurality of pixel openings, each pixel opening is provided with a light emitting unit 30, and each light emitting unit 30 includes a first electrode, a light emitting layer 32, and a second electrode; the first electrode is disposed within the pixel opening and has a plurality of vias 34 disposed thereon. In this embodiment, the first electrode is an anode 31, the second electrode is a cathode 33, the anode 31 is electrically connected to the thin-film transistor layer 12, and the cathode 33 is disposed on the light-emitting layer 32. The cathodes 33 can be respectively disposed in each pixel opening, or the cathodes 33 can be formed into an integrated plate structure and disposed on the pixel defining layer 40 and the light emitting layer 32, in this embodiment, the cathodes 33 are formed into an integrated plate structure, which can simplify the manufacturing process of the OLED display panel and save the manufacturing cost and efficiency.
A thin film encapsulation layer 50 may be disposed on the cathode 33 for protecting the structure of the OLED display panel located therebelow, a filter layer 60 is disposed on a side of the thin film encapsulation layer 50 away from the pixel defining layer 40, and the filter layer 60 includes a plurality of filters 61 and a black matrix 62 located between two adjacent filters 61; the plurality of filters 61 are a red filter, a green filter and a blue filter respectively; the red filter is opposite to the red light-emitting unit, the green filter is opposite to the red light-emitting unit, and the blue filter is opposite to the blue light-emitting unit. The filter 61 allows ambient light having the same color as the ambient light to pass therethrough and enter the inside of the OLED display panel, and the filter 61 may also allow display light having the same color as the ambient light from the corresponding light emitting unit 30 to be emitted to the outside of the OLED display panel through the filter 61.
When external environment light passes through the inside that light filter 61 got into OLED display panel to shine in the pixel opening in, the positive pole that provides in this embodiment is located the pixel opening, and is provided with a plurality of through-holes 34 on the positive pole, has reduced the area of positive pole 31 towards the face of light filter 61, consequently, has reduced the quantity of the external environment light that passes through the OLED panel outside through positive pole 31 reflection, and then has reduced the interference of external environment light to the display screen, has promoted display effect.
As shown in fig. 5, in order to further reduce the reflection amount of the anode 31 to the external ambient light, the through hole 34 is filled with a light absorbing material in this embodiment. When the external ambient light is irradiated into the through holes 34, it can be absorbed by the light absorbing material. When the external ambient light is irradiated on the anode 31, a part of the external ambient light enters the through hole 34 and continues to propagate downward along the through hole 34; the array substrate 10 arranged below the anode 31 can reflect the external ambient light; therefore, when the external ambient light irradiates the array substrate 10, a small amount of external ambient light is still reflected by the array substrate 10 and transmitted out of the OLED display panel, which affects the display effect of the OLED. Therefore, in order to improve the display effect of the OLED display panel, in this embodiment, the through hole 34 is filled with a light absorbing material for absorbing the external ambient light, so that the influence of the reflection of the array substrate 10 on the external ambient light on the display effect of the OLED display panel can be avoided.
Further, the pixel defining layer 40 is made of a light absorbing material, or a light absorbing layer made of a light absorbing material is disposed on the pixel defining layer. Specifically, the pixel defining layer 40 includes a light emitting region and a non-light emitting region, the pixel opening is disposed in the light emitting region, and the light emitting region is opposite to the filter 61; the external ambient light enters the OLED display panel through the filter 61, and the light emitting region and the non-light emitting region are irradiated with the external ambient light entering the OLED display panel. Since the pixel defining layer 40 has a certain reflective capability to the external environment light, the external environment light irradiated on the pixel defining layer 40 can be reflected and transmitted out of the OLED display panel, thereby disturbing the display image of the OLED display panel. Therefore, in this embodiment, the pixel defining layer 40 is made of a light absorbing material, so that the non-display area has a light absorbing function, and the amount of light reflected out of the OLED display panel by the external ambient light irradiated on the pixel defining layer 40 can be reduced. It is understood that the present embodiment may also be provided with a light absorbing layer or a light shielding layer made of a light absorbing material in the non-display area of the pixel defining layer 40, and the light shielding layer or the light absorbing layer is formed in the non-light emitting area by using the processes of exposure, development, and the like.
The light absorbing material used in this embodiment may be an opaque organic material, including but not limited to black organic glue, acrylic resin doped with black pigment, or polyimide doped with black pigment, and may be made of black organic glue. The opaque organic material is cured and patterned to obtain the pixel defining layer 40 or the light absorbing layer disposed on the non-display region of the pixel defining layer 40.
In this embodiment, the first electrode is a multi-film structure, and the first electrode includes two ito layers and an electrode layer between the two ito layers. Specifically, the first electrode may be an anode 31, and the anode 31 includes a first ito layer, an electrode layer, and a second ito layer sequentially disposed thereon; the first indium tin oxide layer and the second indium tin oxide layer can be made of high-work-function materials, and cavity injection is facilitated; the electrode layer can be made of metal silver or other opaque metal materials, and the electrode layer can be preferably made of metal silver to improve the display light utilization rate of the display panel.
The embodiment of the invention also provides a display device which comprises the OLED display panel. With reference to fig. 1 and fig. 6, a method for manufacturing an OLED display panel according to an embodiment of the present invention is described; the method comprises the following specific steps:
step 100, providing an array substrate 10, specifically, forming a thin film transistor layer 12 on a substrate 11 and forming a planarization layer 20 on the thin film transistor layer 12; the planarization layer 20 is usually made of a common organic photoresist, such as polyimide, and is used to compensate the uneven surface of the thin-film transistor layer 12 and form a flat substrate for the pixel defining layer 40 and the anode 31.
In step S200, a light emitting unit 30 and a pixel defining layer 40 for isolating the light emitting unit 30 are formed on the array substrate 10. Specifically, a plurality of anodes 31 are formed on the planarization layer 20, and a pixel defining layer 40 is deposited on the surface of the anode 31 by using a black organic glue, a plurality of pixel openings are disposed on the pixel defining layer 40, and each pixel opening is opposite to the anode 31 below the pixel opening, that is, the anode 31 covers the pixel opening; a plurality of through holes 34 are formed in a portion of the anode 31 located in the pixel opening by a photolithography or wet etching process, a light emitting layer 32 is deposited over the anode 31 by an evaporation technique, and finally a cathode 33 is formed over the light emitting layer 32 by an evaporation process.
Step S300, forming a thin film encapsulation layer 50 on the cathode 33; specifically, a thin film encapsulation layer 50 made of a silicon oxide material or a silicon nitride material may be deposited on the cathode 33 by Chemical Vapor Deposition (CVD).
Step S400, preparing the filter layer 60 on the thin film encapsulation layer 50; specifically, a layer of organic adhesive layer is disposed on the thin film encapsulation layer 50 by coating, imprinting, and the like, the prepared optical filters 61 are attached to the organic adhesive layer, and black organic adhesive is filled between the optical filters 61.
According to the OLED display panel and the display device provided by the invention, the through hole 34 is formed in the anode positioned in the pixel opening, so that the area of the surface, facing the optical filter, of the anode 31 is reduced, the reflection quantity of the anode 31 to external environment light is further reduced, the interference of the external environment light to an OLED display picture is reduced, and the display effect of the OLED display panel is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An OLED display panel is characterized by comprising an array substrate, a plurality of light-emitting units arranged on the array substrate, a pixel definition layer for isolating the light-emitting units, a thin film packaging layer arranged on the pixel definition layer, and a filter layer arranged on the thin film packaging layer;
the filter layer comprises a plurality of optical filters which correspond to the light-emitting units one by one, and the color of light allowed to penetrate through the optical filters is the same as the light-emitting color of the corresponding light-emitting units;
the pixel defining layer comprises a plurality of pixel openings, the light emitting unit comprises a first electrode, a second electrode and a light emitting layer arranged between the first electrode and the second electrode, the light emitting layer is positioned in the pixel openings, the first electrode is positioned between the light emitting layer and the array substrate, and the second electrode is positioned on one side of the light emitting layer, which is far away from the array substrate;
at least one through hole is formed in the part, located in the pixel opening, of the first electrode, and light absorption materials are filled in the through hole;
the number of the through holes is multiple, and the through holes are distributed in the first electrode in a honeycomb shape.
2. The OLED display panel of claim 1, wherein the number of the through holes is plural, and the plurality of through holes are distributed in the first electrode.
3. The OLED display panel according to claim 1 or 2, wherein the through hole has a circular or regular hexagonal sectional shape along a section parallel to the array substrate.
4. The OLED display panel of claim 3, wherein the pixel defining layer is made of the light absorbing material, or a light absorbing layer made of a light absorbing material is disposed on the pixel defining layer.
5. The OLED display panel of claim 4, wherein the light absorbing material is a black organic glue or an acrylate, polyimide doped with a black pigment.
6. The OLED display panel of claim 1, wherein the first electrode is an anode and the second electrode is a cathode;
the plurality of second electrodes form an integral plate-like structure.
7. The OLED display panel of claim 6, wherein the first electrode is a multi-film structure and comprises two ITO layers and an electrode layer between the two ITO layers.
8. A display device comprising the OLED display panel according to any one of claims 1 to 7.
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