Display panel and display device

Abstract

The invention discloses a display panel and a display device. The display panel comprises an array substrate, a pixel definition layer located on one side of the array substrate, a plurality of light-emitting units and a plurality of light-emitting control lines. The light-emitting unit comprises a first electrode layer, a first light-emitting functional layer, a charge generation layer, a second light-emitting functional layer and a second electrode layer which are stacked in sequence; the pixel definition layer comprises a plurality of pixel openings and a plurality of grooves; the light emitting units are arranged in the pixel openings; one light-emitting control line is electrically connected with at least two light-emitting units, and at least one groove is formed between the pixel openings corresponding to the two adjacent light-emitting units electrically connected with the same light-emitting control line; the grooves are used for blocking connection of the charge generation layers in the two adjacent light-emitting units electrically connected with the same light-emitting control line. The invention provides a display panel and a display device. The problem of transverse crosstalk of the display panel can be solved.

Description

Technical Field

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

[0002] Organic Light-Emitting Diode (OLED) is a current-driven light-emitting element with the advantages of fast response, self-luminescence, wide viewing angle and wide operating temperature range, and is therefore widely used in the field of high-performance display. In particular, the demand for notebook computers and car screens is also growing, so the display panel has long life and high HDR (High Dynamic Range Imaging). The peak brightness of the display panel is required to be as high as 1000nit or more, and the normal temperature life T80>10000H.

[0003] In order to meet the above requirements, tandem light-emitting devices are becoming more and more popular in the market. The key technology of the tandem light-emitting device structure is the charge generation layer (CGL), which provides electrons and holes for a single electronic light-emitting element. However, because the CGL layer has strong conductivity, it is easy to cause lateral crosstalk in the light-emitting device under the action of the electric field, resulting in the display panel's taste at low grayscale brightness difficult to meet customer requirements. Summary of the invention

[0004] The invention provides a display panel and a display device, which can improve the problem of lateral crosstalk in the display panel.

[0005] According to one aspect of the present invention, a display panel is provided, the display panel comprising: an array substrate, a pixel definition layer located on one side of the array substrate, a plurality of light emitting units and a plurality of light emitting control lines;

[0006] The light-emitting unit comprises a first electrode layer, a first light-emitting functional layer, a charge generating layer, a second light-emitting functional layer and a second electrode layer which are stacked in sequence;

[0007] The pixel definition layer includes a plurality of pixel openings and a plurality of grooves;

[0008] The light emitting unit is disposed in the pixel opening;

[0009] A light-emitting control line is electrically connected to at least two of the light-emitting units, and at least one groove is arranged between the pixel openings corresponding to each of the two adjacent light-emitting units electrically connected to the same light-emitting control line, and the groove is used to block the connection between the charge generation layers in the two adjacent light-emitting units electrically connected to the same light-emitting control line.

[0010] Optionally, the display panel provided in this embodiment further includes an isolation barrier layer;

[0011] The isolation barrier layer is disposed in the groove;

[0012] The distance between the surface of the isolation barrier layer away from the array substrate and the surface of the charge generation layer on the side of the pixel definition layer away from the array substrate is less than or equal to a set value.

[0013] Optionally, a surface of the isolation barrier layer away from the array substrate is flush with a surface of the charge generating layer on a side of the pixel definition layer away from the array substrate.

[0014] Optionally, the thickness of the isolation barrier layer ranges from 0.9 μm to 1.1 μm.

[0015] Optionally, the first light-emitting functional layer includes a first hole transport layer, a first light-emitting layer and a first electron transport layer which are stacked in sequence;

[0016] The second light-emitting functional layer includes a second hole transport layer, a second light-emitting layer and a second electron transport layer which are stacked in sequence;

[0017] When the first electrode layer is an anode layer and the second electrode layer is a cathode layer, the first hole transport layer is adjacent to the first electrode layer, and the second electron transport layer is adjacent to the second electrode layer;

[0018] When the first electrode layer is a cathode layer and the second electrode layer is an anode layer, the first electron transport layer is adjacent to the first electrode layer, and the second hole transport layer is adjacent to the second electrode layer.

[0019] Optionally, along a direction from the array substrate to the pixel definition layer, the width of the groove gradually decreases, and the width of the pixel opening gradually increases.

[0020] Optionally, the depth of the groove is in the range of

[0021] The distance from the groove to the pixel opening is in the range of

[0022] Optionally, the display panel provided in this embodiment further includes an optical extraction layer;

[0023] The optical extraction layer is located on a side of the second electrode layer away from the first electrode layer.

[0024] Optionally, the material of the isolation barrier layer includes aromatic amine compounds or oxazine compounds.

[0025] According to another aspect of the present invention, a display device is provided. The display device includes the display panel provided by any embodiment of the present invention.

[0026] The present embodiment provides a display panel, which includes an array substrate, a pixel definition layer located on one side of the array substrate, a plurality of light-emitting units and a plurality of light-emitting control lines, wherein the pixel definition layer includes a plurality of pixel openings and a plurality of grooves, and the light-emitting units are located in the pixel openings. At least one groove is provided between the pixel openings corresponding to each of two adjacent light-emitting units electrically connected to the same light-emitting control line, and in the arrangement direction of the light-emitting units electrically connected to the same light-emitting control line, the groove can avoid the electrical connection of the charge generation layers in the two adjacent light-emitting units, thereby improving the problem of lateral crosstalk in the display panel.

[0027] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 is a schematic structural diagram of a display panel provided according to an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of a top view structure of a display panel provided according to an embodiment of the present invention;

[0031] Figure 3 is a schematic structural diagram of another display panel provided according to an embodiment of the present invention;

[0032] Figure 4 is a schematic structural diagram of another display panel provided according to an embodiment of the present invention;

[0033] Figure 5 is a schematic structural diagram of another display panel provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Figure 1 is a schematic structural diagram of a display panel provided according to an embodiment of the present invention, Figure 2 is a schematic diagram of a top view of a display panel provided according to an embodiment of the present invention, with reference to Figure 1 and Figure 2 The display panel provided in this embodiment includes: an array substrate 110, a pixel definition layer 120 located on one side of the array substrate 110, a plurality of light-emitting units 130 and a plurality of light-emitting control lines EM; the light-emitting unit 130 includes a first electrode layer 131, a first light-emitting functional layer 132, a charge generation layer 133, a second light-emitting functional layer 134 and a second electrode layer 135 which are stacked in sequence; the pixel definition layer 120 includes a plurality of pixel openings 121 and a plurality of grooves 122; the light-emitting unit 130 is arranged in the pixel opening 121; a light-emitting control line EM is electrically connected to at least two light-emitting units 130, and at least one groove 122 is arranged between the pixel openings 121 corresponding to each of the two adjacent light-emitting units 130 electrically connected to the same light-emitting control line EM, and the groove 122 is used to block the connection of the charge generation layer 133 in the two adjacent light-emitting units 130 electrically connected to the same light-emitting control line EM.

[0037] Specifically, the array substrate 110 includes a substrate 111 and a driving circuit layer 112 located between the substrate 111 and the pixel definition layer 120. The substrate 111 can be a flexible substrate or a rigid substrate, and the material of the substrate 111 can be polyimide or glass. A plurality of pixel driving circuits are arranged in the driving circuit layer 112, and the pixel driving circuit can be a 7T1C circuit or a 2T1C circuit. Each light-emitting unit 130 has its corresponding and electrically connected pixel driving circuit, and the pixel driving circuit is used to drive the light-emitting unit 130 to emit light. The pixel driving circuit includes a transistor TFT, and the transistor TFT is electrically connected to the first electrode layer 131 of the light-emitting unit 130.

[0038] The plurality of light-emitting units 130 in the display panel may be arranged in an array. In a first direction X (also understood as a lateral direction), at least two light-emitting units 130 are electrically connected to the same light-emitting control line EM. The light-emitting control line EM is electrically connected to the pixel driving circuit. The light-emitting control line EM is used to transmit a light-emitting control signal (also referred to as an EM signal). The light-emitting control signal may control the light-emitting state of the light-emitting unit 130. The light-emitting units 130 electrically connected to the same light-emitting control line EM may emit light at the same time. The first direction X is the arrangement direction of the light-emitting units 130 electrically connected to the same light-emitting control line.

[0039] The first electrode layer 131 may be an anode layer or a cathode layer, and the second electrode layer 135 may be an anode layer or a cathode layer. When the first electrode layer 131 is an anode layer, the second electrode layer 135 is a cathode layer, and when the first electrode layer 131 is a cathode layer, the second electrode layer 135 is an anode layer. The second electrode layer 135 is light-transmissive, and the light emitted by the light-emitting unit 130 may be emitted through the second electrode layer 135. The second electrode layers 135 of the plurality of light-emitting units 130 may be electrically connected as a whole.

[0040] The light emitting unit 130 may be an organic light emitting diode (OLED), and may emit red light, blue light, or green light. The plurality of light emitting units 130 include a red light emitting unit, a green light emitting unit, and a blue light emitting unit.

[0041] The charge generation layer 133 includes N-CGL and P-CGL, which are used to generate electrons and holes, respectively. The charge generation layer 133 has a low work function to achieve low operating voltage and less power consumption, and has a good LUMO and HUMO energy level match with the adjacent charge transport layer to prevent the charge accumulation in the charge generation layer 133 from causing a voltage drop at the PN interface. The charge generation layer 133 is specifically used to transmit electrons to the first light-emitting functional layer 132 and holes to the second light-emitting functional layer 134, or the charge generation layer 133 is used to transmit holes to the first light-emitting functional layer 132 and electrons to the second light-emitting functional layer 134.

[0042] The first light-emitting functional layer 132 and the second light-emitting functional layer 134 are both used for emitting light, and the first light-emitting functional layer 132 and the second light-emitting functional layer 134 in each light-emitting unit 130 are connected in series. The light-emitting color of the first light-emitting functional layer 132 and the light-emitting color of the second light-emitting functional layer 134 can be the same or different.

[0043] The pixel openings 121 may correspond to the light-emitting units 130 one by one, that is, one light-emitting unit 130 may be disposed in each pixel opening 121. Each pixel opening 121 has a corresponding groove 122. In the first direction X, one groove 122 may be disposed between two adjacent pixel openings 121, or two grooves 122 may be disposed. When manufacturing a display panel, the materials of the charge generation layer 133 in a plurality of light-emitting units 130 may be deposited simultaneously to improve the manufacturing efficiency of the display panel. The provision of the grooves 122 may allow the materials of the charge generation layer 133 between two adjacent light-emitting units 130 in the first direction X to fall into the bottom of the grooves 122, and the charge generation layer 133 between two adjacent light-emitting units 130 may be broken, thereby avoiding electrical connection of the charge generation layer 133 in the light-emitting unit 130 electrically connected to the same light-emitting control line, thereby improving the problem of lateral crosstalk in the display panel.

[0044] The present embodiment provides a display panel, which includes an array substrate, a pixel definition layer located on one side of the array substrate, a plurality of light-emitting units and a plurality of light-emitting control lines, wherein the pixel definition layer includes a plurality of pixel openings and a plurality of grooves, and the light-emitting units are located in the pixel openings. At least one groove is provided between the pixel openings corresponding to each of two adjacent light-emitting units electrically connected to the same light-emitting control line, and in the arrangement direction of the light-emitting units electrically connected to the same light-emitting control line, the groove can avoid the electrical connection of the charge generation layers in the two adjacent light-emitting units, thereby improving the problem of lateral crosstalk in the display panel.

[0045] Optional, Figure 3 is a schematic diagram of the structure of another display panel provided according to an embodiment of the present invention, referring to Figure 3The display panel provided in this embodiment also includes an isolation barrier layer 140, which is arranged in the groove 122; the distance between the surface of the isolation barrier layer 140 away from the array substrate 110 and the surface of the charge generation layer 133 on the side of the pixel definition layer 120 away from the array substrate 110 is less than or equal to a set value.

[0046] Specifically, an isolation barrier layer 140 may be disposed in each groove 122. Since two adjacent light-emitting units 130 may be manufactured simultaneously, a charge generation layer 133 may be deposited on the side of the pixel definition layer 120 away from the array substrate 110. The distance between the surface of the isolation barrier layer 140 away from the array substrate 110 and the surface of the charge generation layer 133 on the side of the pixel definition layer 120 away from the array substrate 110 may be equal to 0, that is, the surface of the isolation barrier layer 140 away from the array substrate 110 is flush with the surface of the charge generation layer 133 on the side of the pixel definition layer 120 away from the array substrate 110.

[0047] By setting the distance between the surface of the isolation barrier layer 140 away from the array substrate 110 and the surface of the charge generation layer 133 on the side of the pixel definition layer 120 away from the array substrate 110 to be less than or equal to a set value, the distance between the isolation barrier layer 140 and the charge generation layer 133 on the side of the pixel definition layer 120 away from the array substrate 110 can be made smaller, so that when the material of the second light-emitting functional layer 134 and the second electrode layer 135 is subsequently deposited, the second light-emitting functional layer 134 and the second electrode layer 135 in two adjacent light-emitting units 130 can be integrally connected. When the second light-emitting functional layer 134 and the second electrode layer 135 of multiple light-emitting units 130 in the display panel are integrally connected, the IR drop in the display panel will be reduced, thereby improving the electrical performance of the display panel, and further improving the display effect of the display panel.

[0048] It should be noted that, in this embodiment, the charge generation layer 133 on the side of the pixel definition layer 120 away from the array substrate 110 may not include the charge generation layer 133 in the pixel opening 121 .

[0049] Optional, continue to refer to Figure 3 The surface of the isolation barrier layer 140 away from the array substrate 110 is flush with the surface of the charge generation layer 133 on the side of the pixel definition layer 120 away from the array substrate 110. This arrangement can further ensure that the second light-emitting functional layer 134 and the second electrode layer 135 in two adjacent light-emitting units 130 are integrally connected, thereby improving the display effect of the display panel.

[0050] Optionally, the thickness of the isolation barrier layer ranges from 0.9 μm to 1.1 μm. This arrangement can ensure that the second electrode layers of two adjacent light-emitting units are not broken, thereby improving the display effect of the display panel.

[0051] Optional, Figure 4 is a schematic diagram of the structure of another display panel provided according to an embodiment of the present invention, referring to Figure 4 The first light-emitting functional layer 132 includes a first hole transport layer 10, a first light-emitting layer 20 and a first electron transport layer 30 which are stacked in sequence; the second light-emitting functional layer 134 includes a second hole transport layer 40, a second light-emitting layer 50 and a second electron transport layer 60 which are stacked in sequence; when the first electrode layer 131 is an anode layer and the second electrode layer 135 is a cathode layer, the first hole transport layer 10 is adjacent to the first electrode layer 131, and the second electron transport layer 60 is adjacent to the second electrode layer 135; when the first electrode layer 131 is a cathode layer and the second electrode layer 135 is an anode layer, the first electron transport layer 30 is adjacent to the first electrode layer 131, and the second hole transport layer 40 is adjacent to the second electrode layer 135.

[0052] Specifically, the first hole transport layer 10 and the second hole transport layer 40 are used to transport holes, the first electron transport layer 30 and the second electron transport layer 60 are used to transport electrons, and the first light-emitting layer 20 emits light after the electrons and holes enter the first light-emitting layer 20 and interact with each other, and the second light-emitting layer 50 emits light after the electrons and holes enter the second light-emitting layer 50 and interact with each other.

[0053] Optional, continue to refer to Figure 4 , along the direction from the array substrate 110 to the pixel definition layer 120 , the width of the groove 122 gradually decreases, and the width of the pixel opening 121 gradually increases.

[0054] Specifically, the cross section of the groove 122 may be a trapezoid, and the cross section of the pixel opening 121 may be an inverted trapezoid. In the direction from the array substrate 110 to the pixel definition layer 120, setting the width of the groove 122 to gradually decrease can prevent the charge generation layer 133 in the groove 122 from extending along the sidewall of the groove 122 and thus connecting with the charge generation layer 133 on the side of the pixel definition layer 120 away from the array substrate 110, thereby further ensuring that the charge generation layer 133 in two adjacent light-emitting units 130 can be broken at the groove 122. In the direction from the array substrate 110 to the pixel definition layer 120, setting the width of the pixel opening 121 to gradually increase can prevent part of the light from being unable to be emitted due to the large width above the pixel opening 121 and the small width below the pixel opening 121. Therefore, setting the width of the pixel opening 121 to gradually increase can improve the display effect of the display panel.

[0055] Optional, continue to refer to Figure 4 The depth H of the groove 122 is in the range of 1 μm to 1.2 μm, and the distance L from the side of the groove 122 adjacent to the pixel opening 121 to the side of the pixel opening 121 adjacent to the groove 122 is less than 1 μm.

[0056] Specifically, the depth of the groove 122 is set to be in the range of 1 μm to 1.2 μm, which can ensure that the groove 122 can disconnect the charge generation layer 133 in two adjacent light-emitting units 130. The distance L between the side of the groove 122 adjacent to the pixel opening 121 and the side of the pixel opening 121 adjacent to the groove 122 is set to be less than 1 μm, which can ensure that the groove 122 can block the connection of the charge generation layer 133 between two adjacent light-emitting units 130, and can also reduce the distance between two adjacent light-emitting units 130, thereby improving the PPI of the display panel.

[0057] Figure 5 is a schematic diagram of the structure of another display panel provided according to an embodiment of the present invention, referring to Figure 5 The display panel provided in this embodiment further includes an optical extraction layer 150 ; the optical extraction layer 150 is located on a side of the second electrode layer 135 away from the first electrode layer 131 .

[0058] Specifically, the refractive index of the material of the optical extraction layer 150 may be in the range of 1.8 to 2. The refractive index of the material of the optical extraction layer 150 may be greater than the refractive index of the material of the isolation barrier layer 140, the refractive index of the material of the first light-emitting functional layer 132, and the refractive index of the material of the second light-emitting functional layer 134. This arrangement allows light to be transmitted from a light-sparse medium to a light-dense medium, which can effectively reduce the total reflection effect in the display panel, improve the light extraction rate of the display panel, and also allow the light emitted by the light-emitting unit 130 to be emitted vertically along the surface of the display panel, thereby improving the display effect of the display panel.

[0059] Optionally, the material of the isolation barrier layer includes aromatic amine compounds or oxazine compounds.

[0060] Specifically, the refractive index range of the material of the isolation barrier layer may be 1.6 to 1.8. The oxazine compound may specifically be a triazine compound. Aromatic amine compounds and oxazine compounds are easy to obtain and relatively cheap, and aromatic amine compounds and oxazine compounds are easy to match with the material of the first light-emitting functional layer and the material of the second light-emitting functional layer, and are not easy to chemically react with the material of the first light-emitting functional layer and the material of the second light-emitting functional layer in the display panel. Setting the material of the isolation barrier layer to aromatic amine compounds or oxazine compounds can neither increase the production cost of the display panel too much nor affect the display effect of the display panel.

[0061] This embodiment further provides a display device, which includes the display panel provided by any embodiment of the present invention.

[0062] Specifically, the display device provided in this embodiment may be a device with a display function, such as a mobile phone, a tablet, a computer or a television.

[0063] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0064] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: An array substrate, a pixel definition layer located on one side of the array substrate, a plurality of light-emitting units and a plurality of light-emitting control lines; The light-emitting unit comprises a first electrode layer, a first light-emitting functional layer, a charge generating layer, a second light-emitting functional layer and a second electrode layer which are stacked in sequence; The pixel definition layer includes a plurality of pixel openings and a plurality of grooves; The light emitting unit is disposed in the pixel opening; A light-emitting control line is electrically connected to at least two of the light-emitting units, and at least one groove is provided between the pixel openings corresponding to each of the two adjacent light-emitting units electrically connected to the same light-emitting control line, and the groove is used to block the connection between the charge generation layers in the two adjacent light-emitting units electrically connected to the same light-emitting control line.

2. The display panel according to claim 1, characterized in that: Also included is an isolation barrier layer; The isolation barrier layer is disposed in the groove; The distance between the surface of the isolation barrier layer away from the array substrate and the surface of the charge generation layer on the side of the pixel definition layer away from the array substrate is less than or equal to a set value.

3. The display panel according to claim 2, characterized in that: A surface of the isolation barrier layer away from the array substrate is flush with a surface of the charge generation layer on a side of the pixel definition layer away from the array substrate.

4. The display panel according to claim 2, characterized in that: The thickness of the isolation barrier layer ranges from 0.9 μm to 1.1 μm.

5. The display panel according to claim 1, characterized in that: The first light-emitting functional layer includes a first hole transport layer, a first light-emitting layer and a first electron transport layer which are stacked in sequence; The second light-emitting functional layer includes a second hole transport layer, a second light-emitting layer and a second electron transport layer which are stacked in sequence; When the first electrode layer is an anode layer and the second electrode layer is a cathode layer, the first hole transport layer is adjacent to the first electrode layer, and the second electron transport layer is adjacent to the second electrode layer; When the first electrode layer is a cathode layer and the second electrode layer is an anode layer, the first electron transport layer is adjacent to the first electrode layer, and the second hole transport layer is adjacent to the second electrode layer.

6. The display panel according to claim 1, characterized in that: Along the direction from the array substrate to the pixel definition layer, the width of the groove gradually decreases, and the width of the pixel opening gradually increases.

7. The display panel according to claim 1, characterized in that: The depth of the groove ranges from 1 μm to 1.2 μm; A distance from a side of the groove adjacent to the pixel opening to a side of the pixel opening adjacent to the groove is less than 1 μm.

8. The display panel according to claim 1, characterized in that: Also included is an optical extraction layer; The optical extraction layer is located on a side of the second electrode layer away from the first electrode layer.

9. The display panel according to claim 2, characterized in that: The material of the isolation barrier layer includes aromatic amine compounds or oxazine compounds.

10. A display device, characterized in that: A display panel comprising any one of claims 1 to 9.

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