Display panel

Abstract

The utility model discloses a display panel which comprises a substrate, a pixel definition layer and a plurality of first electrodes are arranged on the substrate at intervals, and the pixel definition layer and the first electrodes are arranged on the same side of the substrate. The pixel definition layer is provided with a plurality of pixel openings, and the first electrodes are exposed out of the pixel definition layer through the pixel openings; a plurality of isolation columns are arranged on the pixel definition layer; the display panel further comprises combined light-emitting layers which are deposited on the sides, away from the substrate, of the pixel definition layers layer by layer. The combined light-emitting layer comprises a first combined area and a second combined area, the first combined area is arranged on the upper surface of the pixel definition layer and in the pixel opening and is connected with the first electrode, and the second combined area is arranged on the upper surface of the isolation column; a fault exists between the second combination area and the first combination area in the thickness direction of the display panel. According to the display panel, the combined light-emitting layer is disconnected by the isolation columns to form the first combined area and the second combined area, transverse current crosstalk is effectively reduced, and the display effect of the display panel is improved.

Description

Technical Field

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

[0002] OLED (Organic Light Emitting Diode) is a current-driven light-emitting element with the advantages of fast response, autonomous light emission, wide viewing angle and wide operating temperature range, and is therefore widely used in the field of high-performance displays. At present, the demand for notebook computers and car-mounted AMOLED screens is growing, so OLED screens are required to have long life and high HDR. In order to meet the above requirements, tandem OLED devices are becoming more and more popular in the market.

[0003] The key part of the tandem OLED device is the charge generation layer, which provides electrons and holes for a single electronic light-emitting element. The CGL layer generally includes N-CGL and P-CGL, which are used to generate electrons and holes, respectively. Therefore, the CGL must have a low work function to achieve low operating voltage and less power consumption, and have a good LUMO and HUMO energy level match with the adjacent charge transport layer to prevent the accumulation of charges in the CGL from causing a voltage drop at the PN interface. However, because the CGL has a strong conductivity, it is easy for the device to have lateral crosstalk under the action of the electric field. As a result, the taste of AMOLED at low grayscale brightness is difficult to meet customer requirements.

[0004] In view of the above defects, the present invention proposes a new display panel. Utility Model Content

[0005] The utility model aims to provide a display panel, which reduces the lateral crosstalk of stacked OLED devices and improves low grayscale display effects.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] The utility model provides a display panel, comprising a substrate, on which a pixel definition layer and a plurality of first electrodes are arranged at intervals, and the pixel definition layer and the first electrodes are arranged on the same side of the substrate;

[0008] The pixel definition layer is provided with a plurality of pixel openings, and each of the first electrodes is exposed outside the pixel definition layer through the pixel openings; the pixel definition layer is also provided with a plurality of isolation columns for separating each of the pixel openings;

[0009] The display panel also includes a combined light-emitting layer, which is deposited layer by layer on a side of the pixel definition layer away from the substrate; the combined light-emitting layer includes a first combined area and a second combined area, the first combined area is arranged on the upper surface of the pixel definition layer and in the pixel opening and is connected to the first electrode, and the second combined area is arranged on the upper surface of the isolation column; there is a fault between the second combined area and the first combined area in the thickness direction of the display panel.

[0010] In the present technical solution, the combined light-emitting layer is disconnected by the isolation column to form a first combined area and a second combined area, so that the electrical connection between the combined light-emitting layers at each pixel opening is greatly reduced, and the lateral current crosstalk between each pixel opening is effectively reduced, thereby improving the control effect of the display panel and improving the display effect of the display panel.

[0011] Preferably, the height of the isolation column in the thickness direction of the display panel is greater than the thickness of the combined light-emitting layer.

[0012] In this technical solution, the first combination area and the second combination area are completely out of contact in the thickness direction of the display panel, which greatly reduces the electrical connection between adjacent first combination area patterns, thereby reducing the lateral crosstalk of the combined light-emitting layer.

[0013] Preferably, at least one isolation column is provided between adjacent pixel openings.

[0014] In the technical solution, the isolation column blocks the current, further improving the effect of resisting lateral interference and improving the display effect of the display panel.

[0015] Preferably, the combined light-emitting layer comprises a light-emitting layer, the light-emitting layer comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, and a plurality of the isolation columns are arranged around the periphery of the blue sub-pixel.

[0016] In this technical solution, the periphery of the blue sub-pixel is effectively isolated by the isolation column, thereby reducing lateral crosstalk.

[0017] Preferably, the number of the isolation columns is two and both are in the shape of square brackets.

[0018] In this technical solution, the two isolation columns are easy to process and avoid excessive power consumption and current voltage drop of the display panel, reduce the electrode fracture area, thereby reducing the resistance of the device and reducing the lateral crosstalk of the display panel.

[0019] Preferably, a linear isolation column is provided between the red sub-pixel and the green sub-pixel.

[0020] In this technical solution, the isolation column has a simple shape, is easy to process, and reduces costs.

[0021] Preferably, the blue sub-pixel has a thickness smaller than that of the red sub-pixel and the green sub-pixel.

[0022] In this technical solution, the blue sub-pixel has a stronger conduction capability, and after being thinned, it maintains normal display capability and reduces material costs.

[0023] Preferably, the cross-section of the isolation column along the thickness direction of the display panel is an inverted trapezoid, the height of the isolation column is 1-2μm, the angle between the side of the cross-section of the isolation column along the thickness direction of the display panel and the upper surface of the pixel definition layer is 100°-130°, and the upper edge of the cross-section is 3.4-4μm long and longer than the lower edge of the cross-section.

[0024] In this technical solution, the isolation column maintains an appropriate height and side tilt angle, so that the combined light-emitting layer forms an obvious fault at the isolation column, thereby greatly reducing the lateral interference between the pixel openings, while the isolation column and the second combination area thereon will not be broken due to being too high.

[0025] Preferably, an insulating gap is formed between a side of a cross section of the isolation column along the thickness direction of the display panel and a side of a cross section of the first combination area along the thickness direction of the display panel, and the cross section of the insulating gap along the thickness direction of the display panel is triangular.

[0026] In the technical solution, the insulating gap further effectively separates the first combination area and the second combination area, thereby improving the effect of isolating lateral crosstalk.

[0027] Preferably, the light-emitting layer includes a first light-emitting layer below and a second light-emitting layer above, a charge generation layer is provided between the first light-emitting layer and the second light-emitting layer, and there is a fault in the thickness direction of the display panel between the charge generation layer in the first combination area and the charge generation layer in the second combination area.

[0028] In the present technical solution, the lateral crosstalk in the light-emitting layer mainly comes from the charge generation layer. The effective isolation of the charge generation layer greatly reduces the lateral crosstalk and improves the display effect.

[0029] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0030] The positive and progressive effects of the utility model are:

[0031] In the display panel of the present invention, the combined light-emitting layer is disconnected by the isolation column to form a first combined area and a second combined area, so that the electrical connection between the combined light-emitting layers at each pixel opening is greatly reduced, and the lateral current crosstalk between each pixel opening is effectively reduced, thereby improving the control effect of the display panel and improving the display effect of the display panel.

[0032] To further understand the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. However, the detailed description and drawings here are only used to illustrate the present application and do not impose any limitations on the scope of the claims of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0034] Figure 1 FIG. 1 is a partial cross-sectional schematic diagram of a display panel according to an embodiment of the present invention.

[0035] Figure 2 FIG. 1 is a partial top view of a display panel according to an embodiment of the present invention.

[0036] Reference numerals

[0037] 1. First electrode

[0038] 2 pixel definition layer

[0039] 3 pixel opening

[0040] 4 Isolation columns

[0041] 5 Combination of light-emitting layers

[0042] 51 First Combination Area

[0043] 52 Second combination area

[0044] 53 First hole transport layer

[0045] 54 Second hole transport layer

[0046] 55 First electron transport layer

[0047] 56 Second electron transport layer

[0048] 57 Charge generation layer

[0049] 58 second electrode

[0050] 61 First light emitting layer

[0051] 62 Second light-emitting layer

[0052] 7 Insulation clearance

[0053] R Red sub-pixel

[0054] G Green sub-pixel

[0055] B Blue sub-pixel DETAILED DESCRIPTION

[0056] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific implementation methods, and the details in the present application can also be modified or changed in various ways according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0057] The following is a detailed description of the embodiments of the present application with reference to the accompanying drawings so that those skilled in the art can easily implement the present application. The present application can be embodied in a variety of different forms and is not limited to the embodiments described herein.

[0058] In the representations of the present application, the representations with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the represented specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples, unless they contradict each other.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] In order to clearly describe the present application, components irrelevant to the description are omitted, and the same reference symbols are given to the same or similar components throughout the specification.

[0061] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0062] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.

[0063] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0064] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present application. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0065] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which this application belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the relevant technical literature and the contents of the current disclosure, and unless defined, shall not be overly interpreted as ideal or very formal meanings.

[0066] like Figure 1 and Figure 2 As shown, the display panel of the utility model includes a substrate, on which a pixel definition layer 2 and a plurality of first electrodes 1 are arranged at intervals, and the pixel definition layer 2 and each first electrode 1 are arranged on the same side of the substrate; a plurality of pixel openings 3 are arranged on the pixel definition layer 2, and each first electrode 1 is exposed to the outside of the pixel definition layer 2 through the pixel opening 3; a plurality of isolation columns 4 are also arranged on the pixel definition layer 2 for separating each pixel opening 3; the display panel also includes a combined light-emitting layer 5, which is deposited layer by layer on a side of the pixel definition layer 2 away from the substrate; the combined light-emitting layer 5 includes a first combination area 51 and a second combination area 52, the first combination area 51 is arranged on the upper surface of the pixel definition layer 2 and in the pixel opening 3 and is connected to the first electrode 1, and the second combination area 52 is arranged on the upper surface of the isolation column 4; there is a fault between the second combination area 52 and the first combination area 51 in the thickness direction of the display panel. The combined light-emitting layer 5 is disconnected by the isolation column 4 to form a first combined area 51 and a second combined area 52, so that the electrical connection between the combined light-emitting layers 5 at each pixel opening 3 is greatly reduced, and the lateral current crosstalk between each pixel opening 3 is effectively reduced, thereby improving the control effect of the display panel and improving the display effect of the display panel.

[0067] The height of the isolation column 4 in the thickness direction of the display panel is greater than the thickness of the combined light-emitting layer 5. The first combined area 51 and the second combined area 52 are completely out of contact in the thickness direction of the display panel, which greatly reduces the electrical connection between adjacent first combined area 51 patterns, thereby reducing the lateral crosstalk of the combined light-emitting layer 5.

[0068] At least one isolation column 4 is disposed between adjacent pixel openings 3. The isolation column 4 blocks the current, further improving the effect of resisting lateral interference and improving the display effect of the display panel.

[0069] The combined light-emitting layer 5 includes a light-emitting layer, which includes a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B. A plurality of isolation columns 4 are arranged around the periphery of the blue sub-pixel B. The periphery of the blue sub-pixel B is effectively isolated by the isolation columns 4, thereby reducing lateral crosstalk.

[0070] There are two spacer columns 4, both of which are in the shape of square brackets. The two spacer columns 4 are easy to process and avoid excessive power consumption and current voltage drop of the display panel, reduce the electrode fracture area, thereby reducing the resistance of the device and reducing the lateral crosstalk of the display panel.

[0071] A linear isolation column 4 is provided between the red sub-pixel R and the green sub-pixel G. The isolation column 4 has a simple shape, is easy to process, and reduces costs.

[0072] The thickness of the blue sub-pixel B is smaller than that of the red sub-pixel R and the green sub-pixel G. The blue sub-pixel B has a strong conduction capability, and after being thinned, normal display capability is maintained while reducing material costs.

[0073] The cross section of the spacer 4 along the thickness direction of the display panel is an inverted trapezoid, the height of the spacer 4 is 1.7 μm, the angle between the side of the cross section of the spacer 4 along the thickness direction of the display panel and the upper surface of the pixel definition layer 2 is 120°, and the upper edge of the cross section is 3.6 μm long and longer than the lower edge of the cross section. The spacer 4 maintains an appropriate height and side tilt angle, so that the combined light-emitting layer 5 forms a clear fault at the spacer 4, thereby greatly reducing the lateral interference between the pixel openings 3, and at the same time, the spacer 4 and the second combined area 52 thereon will not be broken due to being too high.

[0074] In other embodiments, the height of the isolation column 4 may also be other values ​​within the range of 1-2 μm, the angle between the side of the cross section of the isolation column 4 along the thickness direction of the display panel and the upper surface of the pixel definition layer 2 may also be other values ​​within the range of 100°-130°, and the length of the upper edge of the cross section may also be other values ​​within the range of 3.4-4 μm.

[0075] In this embodiment, an insulating gap 7 is formed between the side edge of the cross section of the isolation column 4 along the thickness direction of the display panel and the side edge of the cross section of the first combination area 51 along the thickness direction of the display panel, and the cross section of the insulating gap 7 along the thickness direction of the display panel is triangular. The insulating gap 7 further effectively separates the first combination area 51 and the second combination area 52, thereby improving the effect of isolating lateral crosstalk.

[0076] The light-emitting layer includes a first light-emitting layer 61 at the bottom and a second light-emitting layer 62 at the top, a charge generation layer 57 is arranged between the first light-emitting layer 61 and the second light-emitting layer 62, and there is a fault in the thickness direction of the display panel between the charge generation layer 57 in the first combination area 51 and the charge generation layer 57 in the second combination area 52. The lateral crosstalk in the light-emitting layer mainly comes from the charge generation layer 57, and the effective isolation of the charge generation layer 57 greatly reduces the lateral crosstalk and improves the display effect.

[0077] The display panel comprises, from bottom to top, a first electrode 1, a first hole transport layer 53, a first light-emitting layer 61, a first electron transport layer 55, a charge generation layer 57, a second hole transport layer 54, a second light-emitting layer 62, a second electron transport layer 56, and a second electrode 58 at the pixel opening.

[0078] The display panel in this embodiment is manufactured by a manufacturing method comprising the following steps:

[0079] S1. Setting a substrate;

[0080] S2, a plurality of first electrodes 1 are arranged at intervals on one side of the substrate;

[0081] S3, on the side of the first electrode 1 away from the substrate, coating a negative organic photoresist between each first electrode 1 to prepare a pixel definition layer 2;

[0082] S4, a plurality of pixel openings 3 are provided on the pixel definition layer 2, and each first electrode 1 is exposed outside the pixel definition layer 2 through the pixel openings 3; a mask is used to expose the pixel definition layer 2 on a side of the pixel definition layer 2 away from the substrate, and then a developer is used to wash away the exposed area of ​​the pixel definition layer 2, and the exposed area is cured to obtain a plurality of isolation columns 4 for separating each pixel opening 3;

[0083] S5. On the side of the pixel definition layer 2 away from the first electrode 1, a combined light-emitting layer 5 is arranged. The combined light-emitting layer 5 is deposited layer by layer on the side of the pixel definition layer 2 away from the substrate; the combined light-emitting layer 5 includes a first combined area 51 and a second combined area 52. The first combined area 51 is arranged on the upper surface of the pixel definition layer 2 and in the pixel opening 3 and connected to the first electrode 1. The second combined area 52 is arranged on the upper surface of the isolation column 4. There is a fault between the second combined area 52 and the first combined area 51 in the thickness direction of the display panel. By making structural improvements on the conventional display panel substrate, the lateral crosstalk of the display panel is greatly reduced.

[0084] In step S4, the pixel opening 3 and the spacer 4 are obtained by using the same mask plate. Using the same mask plate to form the pixel opening 3 and the spacer 4 simplifies the process and also reduces the cost of production equipment.

[0085] In summary, the purpose of the present invention is to provide a display panel that reduces the lateral crosstalk of stacked OLED devices and improves low grayscale display effects.

[0086] 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. A display panel, characterized in that: It comprises a substrate, on which a pixel definition layer (2) and a plurality of first electrodes (1) are arranged at intervals, and the pixel definition layer (2) and each of the first electrodes (1) are arranged on the same side of the substrate; The pixel definition layer (2) is provided with a plurality of pixel openings (3), and each of the first electrodes (1) is exposed outside the pixel definition layer (2) through the pixel openings (3); the pixel definition layer (2) is also provided with a plurality of isolation columns (4) for separating each of the pixel openings (3); The display panel further comprises a combined light-emitting layer (5), wherein the combined light-emitting layer (5) is deposited layer by layer on a side of the pixel definition layer away from the substrate; the combined light-emitting layer (5) comprises a first combined area (51) and a second combined area (52), wherein the first combined area (51) is arranged on the upper surface of the pixel definition layer (2) and in the pixel opening (3) and is connected to the first electrode (1), and the second combined area (52) is arranged on the upper surface of the isolation column (4); and there is a fault between the second combined area (52) and the first combined area (51) in the thickness direction of the display panel.

2. The display panel according to claim 1, wherein: The height of the isolation column (4) in the thickness direction of the display panel is greater than the thickness of the combined light-emitting layer (5).

3. The display panel according to claim 1, wherein: At least one isolation column (4) is provided between adjacent pixel openings (3).

4. The display panel according to claim 1, wherein: The combined light-emitting layer comprises a light-emitting layer, the light-emitting layer comprises a red sub-pixel (R), a green sub-pixel (G) and a blue sub-pixel (B), and a plurality of isolation columns (4) are arranged around the periphery of the blue sub-pixel (B).

5. The display panel according to claim 4, wherein: The number of the isolation columns (4) is two and both are in the shape of square brackets.

6. The display panel according to claim 4, wherein: A straight-line isolation column (4) is provided between the red sub-pixel (R) and the green sub-pixel (G).

7. The display panel according to claim 4, wherein: The blue sub-pixel (B) has a thickness smaller than that of the red sub-pixel (R) and the green sub-pixel (G).

8. The display panel according to claim 1, wherein: The cross section of the isolation column (4) along the thickness direction of the display panel is an inverted trapezoid, the height of the isolation column (4) is 1-2 μm, the angle between the side of the cross section of the isolation column (4) along the thickness direction of the display panel and the upper surface of the pixel definition layer (2) is 100°-130°, and the upper edge of the cross section is 3.4-4 μm long and longer than the lower edge of the cross section.

9. The display panel according to claim 8, wherein: An insulating gap (7) is formed between the side edge of the cross section of the isolation column (4) along the thickness direction of the display panel and the side edge of the cross section of the first combination area (51) along the thickness direction of the display panel, and the cross section of the insulating gap (7) along the thickness direction of the display panel is triangular.

10. The display panel according to claim 1, wherein: The light-emitting layer comprises a first light-emitting layer (61) at the bottom and a second light-emitting layer (62) at the top, a charge generation layer (57) is provided between the first light-emitting layer (61) and the second light-emitting layer (62), and a fault exists between the charge generation layer (57) in the first combination area (51) and the charge generation layer (57) in the second combination area (52) in the thickness direction of the display panel.

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