Display panel and display device

Abstract

The application provides a display panel and a display device, and solves the problem of crosstalk between adjacent OLED devices in a laminated OLED display panel in the prior art. The display panel comprises: a first light-emitting device layer; a second light-emitting device layer; and a charge generation layer between the first light-emitting device layer and the second light-emitting device layer. The display panel comprises a plurality of light-emitting areas and a spacing area between adjacent light-emitting areas; and the charge generation layer comprises a patterned structure layer, the patterned structure layer comprises at least one first electron generation unit and at least one first hole generation unit, and the at least one first electron generation unit and the at least one first hole generation unit are alternately arranged at least in the spacing area.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display panel and a display device. Background Technology

[0002] A stacked organic light-emitting diode (OLED) display panel comprises multiple stacked OLED devices, each consisting of multiple stacked OLED cells. Adjacent OLED cells are connected by a charge generation layer, which provides electrons to one OLED cell and holes to another. Typically, the charge generation layer is a single, shared structure among multiple stacked OLED devices. In this case, charge leakage may occur between adjacent OLED devices, leading to crosstalk and affecting light emission quality. Summary of the Invention

[0003] In view of this, embodiments of this application provide a display panel and a display device to solve the problem of crosstalk between adjacent OLED devices in a stacked OLED display panel in the prior art.

[0004] A first aspect of this application provides a display panel, comprising: a first light-emitting device layer; a second light-emitting device layer; and a charge-generating layer located between the first light-emitting device layer and the second light-emitting device layer. The display panel includes a plurality of light-emitting areas and a spacing region located between adjacent light-emitting areas; the charge-generating layer includes a patterned structure layer, the patterned structure layer including at least one first electron-generating unit and at least one first hole-generating unit, the at least one first electron-generating unit and the at least one first hole-generating unit being alternately arranged at least in the spacing region.

[0005] A second aspect of this application provides a display device, including the display panel provided in the embodiments of this application.

[0006] According to the display panel and display device provided in the embodiments of this application, the display panel is a stacked display panel, including a first light-emitting device layer, a second light-emitting device layer, and a charge-generating layer located between the first light-emitting device layer and the second light-emitting device layer. The display panel includes multiple light-emitting areas and intervals located between adjacent light-emitting areas. The charge-generating layer includes a patterned structure layer, which includes at least one first electron-generating unit and at least one first hole-generating unit, which are alternately arranged at least in the intervals. By providing at least one first electron-generating unit and at least one first hole-generating unit in the charge-generating layer, the electron-generating unit supplies and transmits electrons but blocks holes and does not transmit holes; the hole-generating unit supplies and transmits holes but blocks electrons and does not transmit electrons. By providing at least one first electron-generating unit and at least one first hole-generating unit alternately arranged at least in the intervals, where the intervals refer to the area between adjacent stacked OLED devices, the lateral transmission of electrons and holes between adjacent light-emitting areas, i.e., adjacent stacked OLED devices, is blocked, thereby avoiding crosstalk problems. At the same time, at least one first electron generating unit and at least one first hole generating unit form a contact surface with an uneven structure in the patterned structure layer, which increases the contact area compared to a planar contact surface, thereby improving the charge generation capability of the contact surface. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of a stacked OLED display panel in related technologies.

[0008] Figure 2 for Figure 1 The diagram shows the working principle of a single stacked OLED device in an OLED display panel.

[0009] Figure 3 This is a schematic diagram of the structure of the display panel provided in the first embodiment of this application.

[0010] Figure 4 This is a schematic diagram of the structure of the display panel provided in the second embodiment of this application.

[0011] Figure 5 This is a schematic diagram of the structure of the display panel provided in the third embodiment of this application.

[0012] Figure 6 This is a schematic diagram of the structure of the display panel provided in the fourth embodiment of this application.

[0013] Figure 7 This is a schematic diagram of the structure of the display panel provided in the fifth embodiment of this application.

[0014] Figure 8This is a schematic diagram of the structure of the display panel provided in the sixth embodiment of this application.

[0015] Figure 9 This is a schematic diagram of the structure of the display device provided in the embodiments of this application. Detailed Implementation

[0016] As mentioned in the background section, there is a crosstalk problem between adjacent OLED devices in a multilayer OLED display panel. Specifically, Figure 1 This is a schematic diagram of the structure of a stacked OLED display panel in related technologies. Figure 2 for Figure 1 The diagram shows the working principle of a single stacked OLED device in an OLED display panel. Please refer to [the relevant documentation / reference]. Figure 1 The stacked OLED display panel 10 includes multiple stacked OLED devices 11, each stacked OLED device 11 including multiple stacked OLED units, and a charge generation layer 111 is disposed between adjacent OLED units. The charge generation layer 111 is a whole layer structure and is shared by multiple stacked OLED devices 11.

[0017] Taking a single stacked OLED device 11 as an example, the working principle of the stacked OLED device 11 is as follows: Figure 2 As shown, the charge generation layer 111 includes a first surface S and a second surface D disposed opposite to each other. The first surface S is in contact with the hole functional layer of the first OLED unit 112, which can be any one of a hole injection layer, a hole transport layer, or an electron blocking layer. The charge generation layer 111 provides holes to the first OLED unit 112 for recombination with electrons injected from the cathode 113 to emit light. The second surface D is in contact with the electron functional layer of the second OLED unit 114, which can be any one of an electron injection layer, an electron transport layer, or a hole blocking layer. The charge generation layer 111 provides electrons to the second OLED unit 114 for recombination with holes injected from the anode 115 to emit light.

[0018] Combination Figure 1 and Figure 2 As shown, since the charge generation layer 111 is shared by multiple stacked OLED devices 11, and the charge generation layer 111 has high conductivity, the charge in the charge generation layer 111 can move from one stacked OLED device 11 to another, causing lateral crosstalk. Specifically, when the stacked OLED display panel 10 displays a monochrome image, such as a green image, the charge in the green stacked OLED device 11 can flow to the adjacent red or blue stacked OLED device, causing other color stacked OLED devices to emit light, thus affecting the monochrome image quality.

[0019] In view of this, embodiments of this application provide a display panel and a display device. The display panel includes a charge generation layer, which includes a patterned structure layer. The patterned structure layer includes at least one first electron generation unit and at least one first hole generation unit. The at least one first electron generation unit and at least one first hole generation unit are alternately arranged at least in a spacing region, which refers to the area between adjacent stacked OLED devices. The electron generation unit supplies and transmits electrons but blocks holes and does not transmit holes; the hole generation unit supplies and transmits holes but blocks electrons and does not transmit electrons. In this case, by setting at least one first electron generation unit and at least one first hole generation unit alternately arranged at least in the spacing region, the lateral transmission of electrons and holes between adjacent light-emitting areas, i.e., adjacent stacked OLED devices, is blocked, thereby avoiding crosstalk problems.

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Figure 3 This is a schematic diagram of the structure of a display panel provided in the first embodiment of this application. The display panel is a stacked OLED display panel. Figure 3 As shown, the display panel 30 includes a first light-emitting device layer 31, a second light-emitting device layer 32, and a charge-generating layer 33, with the charge-generating layer 33 located between the first light-emitting device layer 31 and the second light-emitting device layer 32. The first light-emitting device layer 31 includes multiple first light-emitting units. The second light-emitting device layer 32 includes multiple second light-emitting units, and the second light-emitting units and first light-emitting units are stacked in a one-to-one correspondence. The stacked first light-emitting units, second light-emitting units, and the charge-generating layer 33 between them constitute a stacked OLED device. It should be understood that this embodiment uses only two light-emitting units as an example; the stacked OLED device may also include more stacked light-emitting units.

[0022] like Figure 3As shown, the area where the stacked OLED devices are located forms the light-emitting region L, and the area between adjacent OLED devices forms the spacer region J. The charge generation layer 33 includes a patterned structure layer, which includes at least one first electron generation unit 3311 and at least one first hole generation unit 3312. The at least one first electron generation unit 3311 and at least one first hole generation unit 3312 are alternately arranged at least in the spacer region J, and the at least one first electron generation unit 3311 and at least one first hole generation unit 3312 form an interface with a concave-convex structure at least in the patterned structure layer. The phrase "alternating arrangement at least in the spacer region J" means that they can be alternately arranged only in the spacer region J, or alternately arranged simultaneously in the spacer region J and the light-emitting region L. The alternating arrangement can be alternating in a predetermined direction, such as alternating in the direction from one OLED device to another OLED device, that is, alternating in the direction from one light-emitting region L to another in adjacent light-emitting regions L. The alternating arrangement can also be alternating on the plane of the patterned structure layer 331, such as being arranged in an array on the plane of the patterned structure layer 331. The shape of either the first electron generating unit 3311 or the first hole generating unit 3312 can be any of the following: cylinder, triangular pyramid, or cube. This embodiment does not limit the specific structure of the patterned structure layer of the light-emitting region L; therefore... Figure 3 The patterned structure layer of the central luminescent region L is shown with dashed dot shadows. For the specific structure of the patterned structure layer of the luminescent region L, please refer to the following embodiment.

[0023] Patterned structural layers can be fabricated using a partitioned doping process. For example, hole generation regions and electron generation regions are selected on the patterned structural layer and spaced apart. P-type doping is performed on the hole generation regions to obtain first hole generation units 3312, and N-type doping is performed on the electron generation regions to obtain first electron generation units 3311. Patterned structural layers can also be fabricated using film layer processes. For example, multiple first hole generation units 3312 can be fabricated on a substrate using a mask vacuum deposition process, inkjet printing process, or flash evaporation process. Then, first electron generation units 3311 are fabricated between pairs of first hole generation units 3312 to obtain the patterned structural layer. The material of the hole generation units 3312 can be an inorganic hole injection material, such as molybdenum trioxide.

[0024] like Figure 3As shown, the display panel 30 may further include a first electrode 34 and a second electrode 35. If the first electrode 34 is a cathode, then the second electrode 35 is an anode; if the first electrode 34 is an anode, then the second electrode 35 is a cathode. The polarity of the first electrode 34 and the second electrode 35 depends on the orientation of the PN junction in the charge generation layer 33 of the light-emitting region L. For example, if the PN junction in the charge generation layer 33 of the light-emitting region L points from the first light-emitting device layer 31 to the second light-emitting device layer 32, then the first electrode 34 is a cathode and the second electrode 35 is an anode. As another example, if the PN junction in the charge generation layer 33 of the light-emitting region L points from the second light-emitting device layer 32 to the first light-emitting device layer 31, then the first electrode 34 is an anode and the second electrode 35 is a cathode. The display panel 30 may further include an array substrate (not shown in the figure), which may contact the second electrode 35 and also contact the first electrode 34.

[0025] The display panel provided in this embodiment includes a charge generation layer, which includes a patterned structure layer. The patterned structure layer includes at least one first electron generation unit 3311 and at least one first hole generation unit 3312. The at least one first electron generation unit 3311 and at least one first hole generation unit 3312 are alternately arranged at least in a spacing region J, where the spacing region J refers to the area between adjacent stacked OLED devices. The electron generation unit 3311 supplies and transmits electrons but blocks holes and does not transmit holes; the hole generation unit 3312 supplies and transmits holes but blocks electrons and does not transmit electrons. In this case, by setting at least one first electron generation unit 3311 and at least one first hole generation unit 3312 to be alternately arranged at least in the spacing region J, the lateral transmission of electrons and holes between adjacent light-emitting regions L, i.e., adjacent stacked OLED devices, is blocked, thereby avoiding crosstalk problems. At the same time, at least one first electron generating unit 3311 and at least one first hole generating unit 3312 form a contact surface with an uneven structure in the patterned structure layer, which increases the contact area compared to a planar contact surface, thereby improving the charge generation capability of the contact surface.

[0026] Figure 4 This is a schematic diagram of the structure of the display panel provided in the second embodiment of this application. Figure 4 As shown, display panel 40 and Figure 3The difference in the display panel 30 is that, in this embodiment, the charge generation layer includes a patterned structure layer, which includes at least one first electron generation unit 4311 and at least one first hole generation unit 4312, which are alternately arranged only in the spacing region J. The patterned structure layer also includes a second electron generation unit 4313 and a second hole generation unit 4314, which are stacked in the light-emitting region L. In the film thickness direction of the charge generation layer 43, the first electron generation unit 4311, the first hole generation unit 4312, the second electron generation unit 4313, and the second hole generation unit 4314 each include a first surface and a second surface disposed opposite to each other. The first surface of the first electron generation unit 4311, the first surface of the first hole generation unit 4312, and the first surface of the second hole generation unit 4314 are coplanar. The second surface of the first electron generation unit 4311, the second surface of the first hole generation unit 4312, and the second surface of the second electron generation unit 4313 are coplanar.

[0027] In one embodiment, the first electron generating unit 4311 and the second electron generating unit 4313 are made of the same material, and the first hole generating unit 4312 and the second hole generating unit 4314 are made of the same material.

[0028] like Figure 4 As shown, the display panel 40 also includes a first electrode 43 and a second electrode 44, where the first electrode 43 is a cathode and the second electrode 44 is an anode.

[0029] According to the display panel 40 provided in this embodiment, a second electron generating unit 4313 and a second hole generating unit 4314 are stacked in the light-emitting area L. The second hole generating unit 4314 generates holes to recombine with electrons injected into the first electrode 43 (cathode) to emit light. The second electron generating unit 4313 generates electrons to recombine with holes injected into the second electrode 44 (anode) to emit light.

[0030] Figure 5 This is a schematic diagram of the structure of a display panel provided in the third embodiment of this application. Figure 5 As shown, display panel 50 and Figure 3The difference in the display panel 30 is that at least one first electron generating unit 5311 and at least one first hole generating unit 5312 are alternately arranged in the spacing region J. The patterned structure layer also includes a third electron generating unit 5313, which is located in the light-emitting region L. In the thickness direction of the patterned structure layer 531, the first electron generating unit 5311, the first hole generating unit 5312, and the third electron generating unit 5313 each include a first surface and a second surface arranged opposite to each other. The first surfaces of the first electron generating unit 5311, the first hole generating unit 5312, and the third electron generating unit 5313 are coplanar, and the second surfaces of the first electron generating unit 5311, the first hole generating unit 5312, and the third electron generating unit 5313 are coplanar. The charge generation layer also includes a hole generating layer 532, which is stacked with the patterned structure layer 531. In one embodiment, the ratio of the height of the first hole generating unit 5311 to the thickness of the hole generating layer 532 is greater than or equal to 1 / 3 and less than or equal to 2 / 3. The height of the first hole-generating unit 5312 is the distance between the two end faces in the thickness direction of the hole-generating layer 532. In one embodiment, the first hole-generating unit 5312 and the hole-generating layer 532 are made of the same material. Figure 5 As shown, the display panel 50 also includes a first electrode 53 and a second electrode 54, where the first electrode 53 is a cathode and the second electrode 54 is an anode.

[0031] Figure 6 This is a schematic diagram of the structure of the display panel provided in the fourth embodiment of this application. Figure 6 As shown, display panel 60 and Figure 5 The difference in the display panel shown is that the charge generation layer further includes an electron generation layer 633, stacked on the side of the patterned structure layer 631 away from the hole generation layer 632. In one embodiment, the material of the electron generation layer 633 is the same as the material of the first electron generation unit 6311. In one embodiment, the ratio of the height of the first electron generation unit 6311 to the thickness of the electron generation layer 633 is greater than or equal to 1 / 3 and less than or equal to 2 / 3. The height of the first electron generation unit 6311 is the distance between the two end faces in the thickness direction of the electron generation layer 633. Figure 6 As shown, the display panel 60 also includes a first electrode 63 and a second electrode 64, where the first electrode 63 is a cathode and the second electrode 64 is an anode.

[0032] Figure 7 This is a schematic diagram of the structure of the display panel provided in the fifth embodiment of this application. Figure 7 As shown, display panel 70 and Figure 3The difference in the display panel 30 shown is that at least one first electron generating unit 7311 and at least one first hole generating unit 7312 are alternately arranged in the interval region J. The patterned structure layer 731 also includes a third hole generating unit 7314, which is located in the light-emitting region L. In the thickness direction of the charge generation layer, the first electron generating unit 7311, the first hole generating unit 7312, and the third hole generating unit 7314 each have a first surface and a second surface arranged opposite to each other. The first surfaces of the first electron generating unit 7311, the first hole generating unit 7312, and the third hole generating unit 7314 are flush, and the second surfaces of the first electron generating unit 7311, the first hole generating unit 7312, and the third hole generating unit 7314 are flush.

[0033] The charge generation layer also includes an electron generation layer 733, which is stacked on top of the patterned structure layer 731. In one example, the ratio of the height of the first electron generation unit 7311 to the thickness of the electron generation layer 733 is greater than or equal to 1 / 3 and less than or equal to 2 / 3. The height of the first electron generation unit 7311 refers to the distance between the two end faces in the thickness direction of the electron generation layer 733.

[0034] like Figure 7 As shown, the display panel 70 also includes a first electrode 73 and a second electrode 74, where the first electrode 73 is a cathode and the second electrode 74 is an anode.

[0035] Figure 8 This is a schematic diagram of the structure of the display panel provided in the sixth embodiment of this application. Figure 8 As shown, display panel 80 and Figure 3 The difference in the provided display panel 30 is that at least one first electron generating unit 8311 and at least one first hole generating unit 8312 are alternately arranged in the spacing region J and the light-emitting region L. The patterned structure layer 831 includes two sides disposed opposite to each other in the stacking direction of the first light-emitting device layer 81 and the second light-emitting device layer 85. The charge generation layer also includes a hole generating layer 832 and an electron generating layer 833, which are respectively stacked on both sides of the patterned structure layer 831. It should be noted that the charge generation layer may include only one of the hole generating layer 832 and the electron generating layer 833.

[0036] like Figure 8 As shown, the display panel 80 also includes a first electrode 83 and a second electrode 84, where the first electrode 83 is a cathode and the second electrode 84 is an anode.

[0037] According to the display panel provided in this embodiment, the structure of the graphic structure layer 831 is the same at all locations, which simplifies the preparation process.

[0038] This application also provides a display device. Figure 9 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 9 As shown, the display device 90 includes the display panel provided in any of the above embodiments. This display device 90 can be any smart terminal with display functionality, such as a laptop computer, mobile phone, handheld game console, e-reader, etc.

[0039] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A display panel, characterized in that, include: First light-emitting device layer; Second light-emitting device layer; as well as A charge generation layer is located between the first light-emitting device layer and the second light-emitting device layer; The display panel includes a plurality of light-emitting areas and a spacer area between adjacent light-emitting areas; the charge generation layer includes a patterned structure layer, the patterned structure layer including at least one first electron generation unit and at least one first hole generation unit, and the at least one first electron generation unit and the at least one first hole generation unit are alternately arranged at least in the spacer area in a direction from one of the adjacent light-emitting areas to another light-emitting area.

2. The display panel according to claim 1, characterized in that, The at least one first electron generating unit and the at least one first hole generating unit are alternately arranged in the interval region; the patterned structure layer further includes a second electron generating unit and a second hole generating unit, which are stacked in the light-emitting region.

3. The display panel according to claim 1, characterized in that, The at least one first electron generating unit and the at least one first hole generating unit are alternately arranged in the interval region; the patterned structure layer further includes a third electron generating unit located in the light-emitting region; the charge generating layer further includes a hole generating layer, which is stacked with the patterned structure layer.

4. The display panel according to claim 3, characterized in that, It also includes an electron-generating layer, stacked on the side of the patterned structure layer away from the hole-generating layer.

5. The display panel according to claim 3, characterized in that, The ratio of the height of the first hole-generating unit to the thickness of the hole-generating layer is greater than or equal to 1 / 3 and less than or equal to 2 / 3.

6. The display panel according to claim 1, characterized in that, The at least one first electron generating unit and the at least one first hole generating unit are alternately arranged in the interval region; the patterned structure layer further includes a third hole generating unit located in the light-emitting region; the charge generating layer further includes an electron generating layer, which is stacked with the patterned structure layer.

7. The display panel according to claim 1, characterized in that, The at least one first electron generating unit and the at least one first hole generating unit are alternately arranged in the interval region and the light-emitting region; the patterned structure layer includes two sides disposed opposite to each other in the stacking direction of the first light-emitting device layer and the second light-emitting device layer, and the charge generating layer further includes an electron generating layer and a hole generating layer, the electron generating layer and the hole generating layer being located on the two sides of the patterned structure layer respectively.

8. The display panel according to any one of claims 1-7, characterized in that, The patterned structure layer includes a plurality of first electron generating units, which are arranged in an array between adjacent light-emitting regions.

9. The display panel according to any one of claims 1-7, characterized in that, The patterned structure layer includes multiple first electron generating units, which are arranged alternately in a predetermined direction, wherein the predetermined direction is the direction from one light-emitting region to another adjacent light-emitting region.

10. A display device, characterized in that, The display panel includes any one of claims 1-9.

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