OLED display panel and display device

Abstract

The utility model provides an OLED (Organic Light Emitting Diode) display panel and a display device. The OLED display panel comprises a substrate; a first electrode in the substrate; the pixel definition layer and the pixel units are arranged on the first electrode, through holes are formed in the pixel definition layer, the through holes are filled with the pixel units, the pixel units are electrically connected with the first electrode, the pixel definition layer comprises a black material layer, and rough patterns are arranged on the outer surface of the black material layer; and the second electrode is arranged on the pixel definition layer and the pixel unit and is electrically connected with the pixel unit. When the OLED display panel is used, external light enters the surface of the black material layer from the second electrode, the rough patterns can enhance the back-and-forth reflection of the light on the surface of the black material layer, the light absorption effect of the light by the black material layer is enhanced, and therefore the reflectivity of the OLED display panel is reduced.

Description

Technical Field

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

[0002] With the continuous development of science and technology, various display screens have been widely used in people's lives and work, bringing great convenience to people's daily lives. Among them, organic light-emitting diode (OLED)-based organic light-emitting display panels have many advantages such as low energy consumption, high resolution, high brightness, high luminous efficiency, fast response speed, wide viewing angle, no need for backlight, low cost and low driving voltage, which greatly meets people's various needs for display devices and has broad research and application prospects in the fields of display and light source.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Utility Model Content

[0004] In view of the problems in the prior art, the purpose of the present invention is to provide an OLED display panel and a display device, which overcome the technical problem of high cost of OLED display panels in the related art.

[0005] The present disclosure provides an OLED display panel, which includes:

[0006] substrate;

[0007] a first electrode disposed in the substrate;

[0008] A pixel definition layer and a pixel unit are disposed on the first electrode, wherein a through hole is formed in the pixel definition layer, the pixel unit is filled in the through hole and is electrically connected to the first electrode, the pixel definition layer comprises a black material layer, and an outer surface of the black material layer is configured as a rough pattern;

[0009] The second electrode is arranged on the pixel definition layer and the pixel unit, and is electrically connected to the pixel unit.

[0010] In some embodiments, the film thickness of the black material layer is 0.3-1.5 μm.

[0011] In some embodiments, the pixel definition layer further comprises:

[0012] The flat layer is coated on the outside of the black material layer, and the rough pattern is arranged on the outer surface where the black material layer contacts the flat layer.

[0013] In some embodiments, the planarization layer has a film thickness of 1-2 μm.

[0014] In some embodiments, an array of first electrodes is formed in a substrate, and a corresponding pixel unit is formed above each first electrode.

[0015] In some embodiments, the second electrode covers the pixel definition layer and all pixel units.

[0016] In some embodiments, the first electrode is an anode and the second electrode is a cathode.

[0017] In some embodiments, the anode is a reflective electrode and the cathode is a semi-transparent electrode.

[0018] In some embodiments, the OLED display panel further includes: an encapsulation layer covering the second electrode.

[0019] The embodiments of the present disclosure further provide an OLED display device, which includes the OLED display panel of any of the above embodiments.

[0020] The OLED display panel and display device of the present invention have the following advantages:

[0021] The OLED display panel includes: a substrate; a first electrode located in the substrate; a pixel definition layer and a pixel unit arranged on the first electrode, a through hole is formed in the pixel definition layer, the pixel unit is filled in the through hole and is electrically connected to the first electrode, the pixel definition layer includes a black material layer, and the outer surface of the black material layer is set to a rough pattern; a second electrode is arranged on the pixel definition layer and the pixel unit, and the second electrode is electrically connected to the pixel unit. External light is incident on the surface of the black material layer from the second electrode, and the rough pattern can enhance the back and forth reflection of light on the surface of the black material layer, enhance the light absorption effect of the black material layer, thereby reducing the reflectivity of the OLED display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0023] Figure 1 A schematic diagram showing the structure of an OLED display panel provided by an embodiment of the present disclosure;

[0024] Figure 2 A schematic diagram showing the structure of an OLED display panel provided by another embodiment of the present disclosure;

[0025] 10, substrate; 20, first electrode; 30, 30a, pixel definition layer; 31, 31a, black material layer; 33, planar layer; 40, 40a, pixel unit; 310, 311, rough pattern; 50, second electrode. DETAILED DESCRIPTION

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present invention will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0027] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0029] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0032] It should be understood that when a component is referred to as being “on another component,” “connected to another component,” “coupled to another component,” or “contacting another component,” it can be directly on, connected to, coupled to, or contacting the other component, or intervening components may be present. In contrast, when a component is referred to as being “directly on another component,” “directly connected to,” “directly coupled to,” or “directly contacting” another component, there are no intervening components present.

[0033] In addition, the accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted.

[0034] In the related art, in OLED display panels, the electrodes are made of high-reflectivity materials, so that the organic light-emitting display panel has a large amount of reflected light when exposed to external light. On the one hand, during the use of the screen, the reflected light can easily shine directly into the human eye, affecting people's experience of use. The use of polarizers can solve this problem, but it also increases power consumption; on the other hand, when the screen is off, it affects the integrated black effect of the screen. Therefore, the high reflectivity of the organic light-emitting display panel is one of the problems that technicians in the display field need to solve.

[0035] In a related technology, the pixel definition layer is made of black material, which can absorb reflected light to a certain extent and reduce the outward reflected light. The embodiment of the present disclosure is expected to further reduce the reflectivity of the OLED display panel.

[0036] Figure 1 A cross-sectional view of an OLED display panel provided by an embodiment of the present disclosure is shown, Figure 1 As shown, the OLED display panel may include:

[0037] Substrate 10;

[0038] A first electrode 20 is disposed in the substrate 10;

[0039] A pixel definition layer 30 and a pixel unit 40 are disposed on the first electrode 20, wherein a through hole (not numbered in the figure) is formed in the pixel definition layer 30, and the pixel unit 40 is filled in the through hole and electrically connected to the first electrode 20, and the pixel definition layer 30 includes a black material layer 31, and an outer surface of the black material layer 31 is provided with a rough pattern 310;

[0040] The second electrode 50 is disposed on the pixel definition layer 30 and the pixel unit 40 , and the second electrode 50 is electrically connected to the pixel unit 40 .

[0041] In the disclosed embodiment, external light is incident from the second electrode 50 to the surface of the black material layer 31, and the rough pattern 310 can enhance the back and forth reflection of light on the surface of the black material layer 31, and enhance the light absorption effect of the black material layer 31, thereby reducing the reflectivity of the OLED display panel. Specifically, in the light-emitting stage, the reflected light of the external light is absorbed by the black material layer 31 to avoid directly entering the eyes and affecting the visual experience. In the screen-off state, the reflected light of the external light is absorbed, which enhances the integrated black effect of the screen.

[0042] In one embodiment of the present disclosure, the substrate 10 may be a rigid substrate or a flexible substrate. The rigid substrate may be a glass substrate, and the flexible substrate may be a polyimide film.

[0043] In the embodiment of the present disclosure, the first electrode 20 is an anode and the second electrode 50 is a cathode. When the cathode and the anode are energized, the pixel unit 40 emits light.

[0044] An array of first electrodes 20 is formed in the substrate 10 , that is, the first electrodes 20 are distributed in the substrate 10 in an array manner, and a corresponding pixel unit 40 is formed above each first electrode 20 , and the pixel unit 40 serves as an OLED light-emitting layer.

[0045] In one embodiment, the second electrode 50 is a complete layer structure, covering the pixel definition layer 30 and all pixel units 40 .

[0046] In the embodiment of the present disclosure, the first electrode 20 is an anode, which is a reflective electrode, and the second electrode 50 is a cathode, which is a semi-transparent electrode. The reflective electrode is relative. Compared with the cathode, the anode is a reflective electrode and has a high reflectivity relative to the cathode. Therefore, the use of a black PDL layer can shield the anode of this part, thereby reducing the reflection interference of external light on this part and improving the luminous efficiency of the OLED display panel.

[0047] In one implementation, the anode may be indium tin oxide (ITO) or tin-doped indium oxide.

[0048] Compared with the anode, the cathode is a semi-transparent electrode. The semi-transparent electrode has both energy supply and light transmission properties. On the one hand, it needs to provide electrical signals, so it cannot be fully transparent. On the other hand, it allows the light emitted by the pixel unit 40 to be transmitted outward. Therefore, the cathode selects a semi-transparent electrode. At this time, the cathode can select a thinner metal design, such as silver or a silver-containing alloy.

[0049] In the embodiment of the present disclosure, the pixel units 40 are arranged in an array, for example, they can be pixels of three colors: red (R), green (G), and blue (B), and each pixel can include structures such as a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, and an electron transport layer.

[0050] In the disclosed embodiment, the film thickness of the black material layer 31 is 0.3-1.5 μm. Within this film thickness range, the black material layer 31 can achieve a good light absorption effect. The rough pattern 310 on the surface of the black material layer 31 can be produced by etching or laser processing technology.

[0051] The black material layer 31 may be made of black pigment or black dye.

[0052] The present disclosure also provides another OLED display panel. Figure 1 In comparison, Figure 2 In the OLED display panel shown, the pixel definition layer 30a further includes:

[0053] A planarization layer PNL (planarization layer) 33 is coated on the outside of the black material layer 31a, and a rough pattern 311 is provided on the outer surface of the black material layer 31a in contact with the planarization layer 33. The planarization layer 33 provides a planar surface condition above the black material layer 31a and also defines the position of the through hole for filling the pixel unit 40a. For example, the planarization layer 33 can be made of an organic layer such as acrylic resin, epoxy resin, phenolic resin, polyamide resin or polyimide resin.

[0054] In one embodiment of the present disclosure, the thickness of the planar layer 33 is 1-2 μm.

[0055] In one embodiment of the present disclosure, the OLED display panel may further include an encapsulation layer (not numbered in the figure) covering the second electrode 50 a .

[0056] The present disclosure also provides an OLED display device, which includes Figure 1 or Figure 2 OLED display panel shown.

[0057] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An OLED display panel, characterized in that: include: substrate; a first electrode disposed in the substrate; A pixel definition layer and a pixel unit are disposed on the first electrode, wherein a through hole is formed in the pixel definition layer, the pixel unit is filled in the through hole and is electrically connected to the first electrode, the pixel definition layer comprises a black material layer, and an outer surface of the black material layer is configured as a rough pattern; A second electrode is disposed on the pixel definition layer and the pixel unit, and the second electrode is electrically connected to the pixel unit.

2. The OLED display panel according to claim 1, characterized in that: The film thickness of the black material layer is 0.3-1.5 μm.

3. The OLED display panel according to claim 1, characterized in that: The pixel definition layer further comprises: A flat layer is coated on the outside of the black material layer, and the rough pattern is arranged on the outer surface of the black material layer in contact with the flat layer.

4. The OLED display panel according to claim 3, characterized in that: The thickness of the flat layer is 1-2 μm.

5. The OLED display panel according to claim 1, characterized in that: An array of the first electrodes is formed in the substrate, and a corresponding pixel unit is formed above each of the first electrodes.

6. The OLED display panel according to claim 5, characterized in that: The second electrode covers the pixel definition layer and all the pixel units.

7. The OLED display panel according to claim 1, characterized in that: The first electrode is an anode, and the second electrode is a cathode.

8. The OLED display panel according to claim 7, characterized in that: The anode is a reflective electrode, and the cathode is a semi-transparent electrode.

9. The OLED display panel according to claim 1, characterized in that: The OLED display panel further includes: an encapsulation layer covering the second electrode.

10. An OLED display device, characterized in that: Comprising the OLED display panel as described in any one of claims 1 to 9.

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