Display plate and display device

Abstract

Display plate, the display plate comprising: a substrate; a first electrode layer arranged on one side of the substrate; a first electron blocking layer arranged on a side of the first electrode layer facing away from the substrate; a first luminescent layer arranged on a side of the first electron blocking layer facing away from the substrate; a charge-generating layer arranged on a side of the first luminescent layer facing away from the substrate; a second luminescent layer arranged on a side of the charge-generating layer facing away from the substrate; and a second electrode layer arranged on a side of the second luminescent layer facing away from the substrate;wherein the first luminescent layer comprises a first blue luminescent unit, a first green luminescent unit and a first red luminescent unit, the first electron-blocking layer comprises a first electron-blocking section corresponding to the first blue luminescent unit, a second electron-blocking section corresponding to the first green luminescent unit and a third electron-blocking section corresponding to the first red luminescent unit; wherein in the first electron-blocking layer the first electron-blocking section, the second electron-blocking section and the third electron-blocking section are formed as a single-piece structure.

Description

Display panel and display device TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel and a display device. BACKGROUND

[0002] Compared with liquid crystal display, organic light-emitting diode (OLED) display panel has the advantages of lightness, good display effect, high resolution, wide color gamut, and flexible display, etc., so that it has rapidly developed in recent years, has become the preferred display panel type in small size application field, and gradually expands to medium and large size application field.

[0003] The stability requirement of medium and large size OLED display field to display is higher, which makes the application demand of tandem OLED device which has great advantage in the display life of the device increase, and major display manufacturers also invest resources for technology and product development.

[0004] The researchers of the present application found that in the related technology, the structure of the tandem OLED device is complex, the material cost is high, and the manufacturing process is complex, which leads to high manufacturing cost of the display panel. Therefore, how to simplify the structure of the tandem device and reduce the production cost of the display panel is a technical problem that needs to be solved by the technical personnel in the field. SUMMARY

[0005] The present application provides a display panel and a display device, which can effectively solve the technical problems of complex structure and high production cost of the display panel.

[0006] In a first aspect, the present application provides a display panel, comprising:

[0007] a substrate;

[0008] a first electrode layer disposed on one side of the substrate;

[0009] a first electron blocking layer disposed on a side of the first electrode layer away from the substrate;

[0010] a first light-emitting layer disposed on a side of the first electron blocking layer away from the substrate;

[0011] a charge generation layer disposed on a side of the first light-emitting layer away from the substrate;

[0012] a second light-emitting layer disposed on a side of the charge generation layer away from the substrate;

[0013] a second electrode layer disposed on a side of the second light-emitting layer away from the substrate;

[0014] The first light-emitting layer includes a first blue light unit, a first green light unit, and a first red light unit, and the first electron blocking layer includes a first electron blocking part corresponding to the first blue light unit, a second electron blocking part corresponding to the first green light unit, and a third electron blocking part corresponding to the first red light unit.

[0015] The first electron blocking part, the second electron blocking part, and the third electron blocking part in the first electron blocking layer are in an integrated structure.

[0016] In a second aspect, the present application provides a display device, which includes a housing and the display panel as described above, and the housing has a receiving space, and the display panel is arranged in the receiving space. Advantages

[0017] The display panel and the display device provided by the present application include a substrate, a first electrode layer, a first electron blocking layer, a first light-emitting layer, a charge generation layer, a second light-emitting layer, and a second electrode layer. The first electrode layer is arranged on one side of the substrate. The first electron blocking layer is arranged on a side of the first electrode layer away from the substrate. The first light-emitting layer is arranged on a side of the first electron blocking layer away from the substrate. The charge generation layer is arranged on a side of the first light-emitting layer away from the substrate. The second light-emitting layer is arranged on a side of the charge generation layer away from the substrate. The second electrode layer is arranged on a side of the second light-emitting layer away from the substrate. The first light-emitting layer includes a first blue light unit, a first green light unit, and a first red light unit. The first electron blocking layer includes a first electron blocking part, a second electron blocking part, and a third electron blocking part. The first electron blocking part corresponds to the first blue light unit. The second electron blocking part corresponds to the first green light unit. The third electron blocking part corresponds to the first red light unit. The first electron blocking part, the second electron blocking part, and the third electron blocking part in the first electron blocking layer are in an integrated structure. The display panel provided by the present application can effectively solve the technical problems of complex structure and high production cost of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0019] Fig. 1 is a structural schematic diagram of a display panel according to an embodiment of the present application.

[0020] Fig. 2 is a structural schematic diagram of a display panel according to another embodiment of the present application.

[0021] Legend of reference signs:

[0022] substrate, 10; first electrode layer, 20; first hole injection layer, 30; first hole transport layer, 40; first electron blocking layer, 50; first electron blocking part, 51; second electron blocking part, 52; third electron blocking part, 53; first light emitting layer, 60; first blue light unit, 61; first green light unit, 62; first red light unit, 63; first hole blocking layer, 70; first electron transport layer, 80; charge generation layer, 90; first type charge generation layer, 91; second type charge generation layer, 92; second hole transport layer, 100; second electron blocking layer, 110; fourth electron blocking part, 111; fifth electron blocking part, 112; sixth electron blocking part, 113; second light emitting layer, 120; second blue light unit, 121; second green light unit, 122; second red light unit, 123; second hole blocking layer, 130; second electron transport layer, 140; second electron injection layer, 150; second electrode layer, 160; cap layer, 170; third electron blocking layer, 180; seventh electron blocking part, 181; eighth electron blocking part, 182. Embodiments of the present application

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the outline of the device.

[0024] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the elements and arrangements of the particular examples are described in the following disclosure. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application can repeatedly refer to reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials. The following are described in detail, respectively, and it should be noted that the order of the following embodiments is not limited to the preferred order of the embodiments.

[0025] In a first aspect, the present application provides a display panel, comprising:

[0026] a substrate;

[0027] a first electrode layer disposed on one side of the substrate;

[0028] a first electron blocking layer disposed on a side of the first electrode layer away from the substrate;

[0029] a first light emitting layer disposed on a side of the first electron blocking layer away from the substrate;

[0030] a charge generation layer disposed on a side of the first light emitting layer away from the substrate;

[0031] a second light emitting layer disposed on a side of the charge generation layer away from the substrate;

[0032] a second electrode layer disposed on a side of the second light emitting layer away from the substrate;

[0033] wherein the first light emitting layer comprises a first blue light unit, a first green light unit and a first red light unit, and the first electron blocking layer comprises a first electron blocking part corresponding to the first blue light unit, a second electron blocking part corresponding to the first green light unit, and a third electron blocking part corresponding to the first red light unit.

[0034] wherein the first electron blocking part, the second electron blocking part and the third electron blocking part in the first electron blocking layer are of an integrated structure.

[0035] Optionally, the second light emitting layer comprises a second blue light unit, and the display panel further comprises a second electron blocking layer, the second electron blocking layer comprising a fourth electron blocking part corresponding to the second blue light unit, and the fourth electron blocking part being of the same material as the first electron blocking part.

[0036] Optionally, the first blue light unit and the second blue light unit each comprise a fluorescent material.

[0037] Optionally, the second light-emitting layer further comprises a second green light unit, wherein the second electron blocking layer comprises a fifth electron blocking part corresponding to the second green light unit, the HOMO energy level of the fifth electron blocking part is greater than the HOMO energy level of the second electron blocking part, and the LUMO energy level of the fifth electron blocking part is less than the LUMO energy level of the second electron blocking part.

[0038] Optionally, the thickness of the second electron blocking part is the same as the thickness of the first electron blocking part, and the thickness of the fifth electron blocking part is 5-7 times the thickness of the fourth electron blocking part.

[0039] Optionally, the second light-emitting layer further comprises a second red light unit, wherein the second electron blocking layer comprises a sixth electron blocking part corresponding to the second red light unit, the HOMO energy level of the sixth electron blocking part is greater than the HOMO energy level of the third electron blocking part, and the LUMO energy level of the sixth electron blocking part is less than the LUMO energy level of the third electron blocking part.

[0040] Optionally, the thickness of the third electron blocking part is the same as the thickness of the first electron blocking part, and the thickness of the sixth electron blocking part is 15-17 times the thickness of the fourth electron blocking part.

[0041] Optionally, the charge generation layer comprises a first type charge generation layer and a second type charge generation layer, the second type charge generation layer is arranged on the side of the first type charge generation layer away from the first light-emitting layer; wherein the first type charge generation layer comprises an electron mobility enhancement material, and the doping ratio of the electron mobility enhancement material is 5%-15%; the second type charge generation layer comprises a hole mobility enhancement material, and the doping ratio of the hole mobility enhancement material is 1%-10%.

[0042] Optionally, the fourth electron blocking part, the fifth electron blocking part, and the sixth electron blocking part are arranged at intervals.

[0043] Optionally, the second light-emitting layer further comprises a second green light unit and a second red light unit, the second electron blocking layer further comprises a fifth electron blocking part corresponding to the second green light unit and a sixth electron blocking part corresponding to the second red light unit, wherein the fourth electron blocking part, the fifth electron blocking part and the sixth electron blocking part in the second electron blocking layer are in an integrated structure; the display panel further comprises a third electron blocking layer arranged between the second light-emitting layer and the second electron blocking layer, the third electron blocking layer comprises a seventh electron blocking part corresponding to the second green light unit and an eighth electron blocking part corresponding to the second red light unit, and the seventh electron blocking part and the eighth electron blocking part are arranged in a spaced manner.

[0044] Optionally, a surface of the second blue light unit close to the substrate directly contacts a surface of the second electron blocking layer away from the substrate.

[0045] In a second aspect, the present application provides a display device, comprising a housing and the display panel as any one of the above.

[0046] The technical solutions of the present application are described below in combination with specific embodiments.

[0047] Embodiment one

[0048] FIG. 1 is a structural schematic diagram of a display panel according to an embodiment of the present application. Referring to FIG. 1, in a first aspect, the present application provides a display panel, which comprises a substrate 10, a first electrode layer 20, a first electron blocking layer 50, a first light-emitting layer 60, a charge generation layer 90, a second light-emitting layer 120, and a second electrode layer 160. The first electrode layer 20 is disposed on one side of the substrate 10. The first electron blocking layer 50 is disposed on a side of the first electrode layer 20 away from the substrate 10. The first light-emitting layer 60 is disposed on a side of the first electron blocking layer 50 away from the substrate 10. The charge generation layer 90 is disposed on a side of the first light-emitting layer 60 away from the substrate 10. The second light-emitting layer 120 is disposed on a side of the charge generation layer 90 away from the substrate 10. The second electrode layer 160 is disposed on a side of the second light-emitting layer 120 away from the substrate 10. The first light-emitting layer 60 comprises a first blue light unit 61, a first green light unit 62, and a first red light unit 63. The first electron blocking layer 50 comprises a first electron blocking part 51, a second electron blocking part 52, and a third electron blocking part 53. The first electron blocking part 51 corresponds to the first blue light unit 61. The second electron blocking part 52 corresponds to the first green light unit 62. The third electron blocking part 53 corresponds to the first red light unit 63. The first electron blocking part 51, the second electron blocking part 52, and the third electron blocking part 53 are in an integrated structure.

[0049] In the display panel provided by the present application, the first light-emitting layer 60 disposed between the first electrode layer 20 and the charge generation layer 90 and the second light-emitting layer 120 disposed between the charge generation layer 90 and the second electrode layer 160 both have light-emitting functions and can serve as two light-emitting layers in a stacked OLED device to jointly realize a display function.

[0050] In the display panel provided by the present application, the first electron blocking layer 50 can block electrons from entering the first electrode layer 20, so that more electrons are left in the first light-emitting layer 60, thereby increasing the probability of recombination of electrons and holes and improving the light-emitting efficiency of the display panel and prolonging the service life of the display panel. Specifically, the first electron blocking part 51 corresponding to the first blue light unit 61 can leave more electrons in the first blue light unit 61. The second electron blocking part 52 corresponding to the first green light unit 62 can leave more electrons in the first green light unit 62. The third electron blocking part 53 corresponding to the first red light unit 63 can leave more electrons in the first red light unit 63.

[0051] The display panel provided in the embodiment of the present application, because the first, second and third electron blocking parts 51, 52 and 53 in the first electron blocking layer 50 are of an integrated structure, the first electron blocking layer 50 including the first, second and third electron blocking parts 51, 52 and 53 has a full-surface planar structure, compared with the patterned electron blocking layer in the related art, two mask plates are saved, two photomasks are saved, the process steps are simplified, and the production manufacturing cost is reduced. Moreover, because the first, second and third electron blocking parts 51, 52 and 53 are of an integrated structure, the first, second and third electron blocking parts 51, 52 and 53 are prepared by using the same process to form the same material, thereby reducing the types of materials and reducing the material cost.

[0052] In some embodiments of the present application, the second light-emitting layer 120 includes a second blue light unit 121 corresponding to the first blue light unit 61, and the display panel further includes a second electron blocking layer 110 including a fourth electron blocking part 111 corresponding to the second blue light unit 121, the fourth electron blocking part 111 being of the same material as the first electron blocking part 51.

[0053] In the display panel provided in the embodiment of the present application, the second electron blocking layer 110 has a similar function to the first electron blocking layer 50, and the difference is that the second electron blocking layer 110 can block electrons from entering the second electrode layer 160, so that more electrons are left in the second light-emitting layer 120, thereby increasing the probability of recombination of electrons and holes, and further improving the light-emitting efficiency and service life of the display panel. Specifically, the fourth electron blocking part 111 corresponding to the second blue light unit 121 can make more electrons remain in the second blue light unit 121, so as to improve the light-emitting efficiency of the second blue light unit 121 and prolong the service life of the second blue light unit 121.

[0054] The display panel provided in the embodiments of the present application has the same material for the fourth electron blocking part 111 and the first electron blocking part 51, that is, the first electron blocking layer 50 can be prepared by using the material for forming the fourth electron blocking part 111, so that the material cost can be further reduced. More importantly, the blue light emitting unit (including the first blue light unit 61 and the second blue light unit 121) is more sensitive to the performance of the electron blocking part among the light emitting units of different colors. Since the fourth electron blocking part 111 corresponds to the second blue light unit 121 with blue light emitting color, the first electron blocking part 51, the second electron blocking part 52 and the third electron blocking part 53 in the first electron blocking layer 50 are formed by using the material of the fourth electron blocking part 111, so that the light emitting efficiency and service life of the first blue light unit 61 in the first light emitting layer 60 can be maximized on the basis of simplifying the process and reducing the material cost, and the display quality of the display panel is improved.

[0055] In some embodiments of the present application, the first blue light unit 61 and the second blue light unit 121 each include a fluorescent material.

[0056] In the display panel provided in the embodiments of the present application, since the first blue light unit 61 and the second blue light unit 121 each include a fluorescent material, the fluorescent material has higher performance requirement for the electron blocking part than other light emitting materials such as phosphorescent material, so that the blue light emitting unit has greater sensitivity to the electron blocking layer, and the material of the first electron blocking part 51, the second electron blocking part 52 and the third electron blocking part 53 in the first electron blocking layer 50 needs to be the same as that of the fourth electron blocking part 111.

[0057] In some embodiments of the present application, the second light emitting layer 120 further includes a second green light unit 122, and the second electron blocking layer 110 includes a fifth electron blocking part 112 corresponding to the second green light unit 122.

[0058] In the display panel provided in the embodiments of the present application, the fifth electron blocking part 112 corresponding to the second green light unit 122 can keep more electrons in the second green light unit 122.

[0059] In some embodiments of the present application, the HOMO energy level of the second electron blocking part 52 is greater than the HOMO energy level of the fifth electron blocking part 112, and the LUMO energy level of the second electron blocking part 52 is less than the LUMO energy level of the fifth electron blocking part 112.

[0060] The HOMO energy level refers to the energy level of the highest occupied molecular orbital, and the LUMO energy level refers to the energy level of the lowest unoccupied molecular orbital.

[0061] In the display panel provided in the embodiment of the present application, because the HOMO energy level of the second electron blocking part 52 is greater than the HOMO energy level of the fifth electron blocking part 112, and the LUMO energy level of the second electron blocking part 52 is less than the LUMO energy level of the fifth electron blocking part 112, the electron blocking performance of the second electron blocking part 52 is stronger than that of the fifth electron blocking part 112, so that more electrons can be kept in the first green light unit 62.

[0062] In some embodiments of the present application, the thickness of the second electron blocking part 52 is the same as the thickness of the first electron blocking part 51, and the thickness of the fifth electron blocking part 112 is 5-7 times the thickness of the fourth electron blocking part 111.

[0063] In the display panel provided in the embodiment of the present application, the material and forming process of the second electron blocking part 52 and the first electron blocking part 51 are the same, and accordingly, the thickness of the second electron blocking part 52 can be the same as the thickness of the first electron blocking part 51 through the same process conditions.

[0064] In the display panel provided in the embodiment of the present application, the luminous efficiency of the second green light unit 122 is greater than the luminous efficiency of the first green light unit 62, which has a greater impact on the display effect of the display panel, and the relative position of the microcavity of the second green light unit 122 directly affects the luminous efficiency of the second green light unit 122. In the related art, the thickness of the second electron blocking part 52 corresponding to the first green light unit 62 is different from the thickness of the first electron blocking part 51 corresponding to the first blue light unit 61, for example, the thickness of the second electron blocking part 52 is greater than the thickness of the first electron blocking part 51. Therefore, when the thickness of the second electron blocking part 52 is the same as the thickness of the first electron blocking part 51, it is equivalent to thinning the second electron blocking part 52, which further affects the relative position of the microcavity of the second green light unit 122, so that the microcavity of the second green light unit 122 sinks by a certain distance, and the light output of the second green light unit 122 cannot be maintained in the microcavity enhancement state, thereby reducing the display effect of the display panel. In the related art, the thickness of the fifth electron blocking part 112 is 2-4 times the thickness of the fourth electron blocking part 111.

[0065] The display panel provided in the embodiment of the present application has the thickness of the fifth electron blocking part 112 being 5-7 times of the thickness of the fourth electron blocking part 111, so that the thickness of the fifth electron blocking part 112 is thickened, and the relative position of the microcavity of the second green light unit 122 is adjusted by the increase of the thickness of the fifth electron blocking part 112, so that the light emission of the second green light unit 122 is maintained in the microcavity enhancement state when the thickness of the second electron blocking part 52 is the same as the thickness of the first electron blocking part 51, and the display effect of the display panel is improved.

[0066] In some embodiments of the present application, the second light-emitting layer 120 further includes a second red light unit 123, and the second electron blocking layer 110 includes a sixth electron blocking part 113 corresponding to the second red light unit 123.

[0067] In the display panel provided in the embodiment of the present application, the sixth electron blocking part 113 corresponding to the second red light unit 123 can keep more electrons in the second red light unit 123.

[0068] In some embodiments of the present application, the HOMO energy level of the third electron blocking part 53 is greater than the HOMO energy level of the sixth electron blocking part 113, and the LUMO energy level of the third electron blocking part 53 is less than the LUMO energy level of the sixth electron blocking part 113.

[0069] In the display panel provided in the embodiment of the present application, because the HOMO energy level of the third electron blocking part 53 is greater than the HOMO energy level of the sixth electron blocking part 113, and the LUMO energy level of the third electron blocking part 53 is less than the LUMO energy level of the sixth electron blocking part 113, the electron blocking performance of the third electron blocking part 53 is stronger than that of the sixth electron blocking part 113, so that more electrons can be kept in the first red light unit 63.

[0070] In some embodiments of the present application, the thickness of the third electron blocking part 53 is the same as the thickness of the first electron blocking part 51, and the sixth electron blocking part 113 is 15-17 times of the thickness of the fourth electron blocking part 111.

[0071] In the display panel provided in the embodiment of the present application, the material and forming process of the third electron blocking part 53 and the first electron blocking part 51 are the same, and correspondingly, the thickness of the third electron blocking part 53 can be the same as the thickness of the first electron blocking part 51 by the same process condition.

[0072] The display panel provided in the embodiment of the present application has the advantages that the light-emitting efficiency of the second red light unit 123 is greater than that of the first red light unit 63, the second red light unit 123 has a greater influence on the display effect of the display panel, and the relative position of the microcavity of the second red light unit 123 directly affects the light-emitting efficiency of the second red light unit 123. In the related art, the thickness of the third electron blocking part 53 corresponding to the first red light unit 63 is different from the thickness of the first electron blocking part 51 corresponding to the first blue light unit 61, for example, the thickness of the third electron blocking part 53 is greater than the thickness of the first electron blocking part 51. Therefore, when the thickness of the third electron blocking part 53 is the same as the thickness of the first electron blocking part 51, the third electron blocking part 53 is thinned, which affects the relative position of the microcavity of the second red light unit 123, so that the microcavity of the second red light unit 123 is sunken by a certain distance, and the light emission of the second red light unit 123 cannot be maintained in the microcavity enhancement state, thereby reducing the display effect of the display panel. In the related art, the thickness of the sixth electron blocking part 113 is 10-12 times the thickness of the fourth electron blocking part 111.

[0073] The display panel provided in the embodiment of the present application has the advantages that the light-emitting efficiency of the second red light unit 123 is greater than that of the first red light unit 63, the second red light unit 123 has a greater influence on the display effect of the display panel, and the relative position of the microcavity of the second red light unit 123 directly affects the light-emitting efficiency of the second red light unit 123. In the related art, the thickness of the third electron blocking part 53 corresponding to the first red light unit 63 is different from the thickness of the first electron blocking part 51 corresponding to the first blue light unit 61, for example, the thickness of the third electron blocking part 53 is greater than the thickness of the first electron blocking part 51. Therefore, when the thickness of the third electron blocking part 53 is the same as the thickness of the first electron blocking part 51, the third electron blocking part 53 is thinned, which affects the relative position of the microcavity of the second red light unit 123, so that the microcavity of the second red light unit 123 is sunken by a certain distance, and the light emission of the second red light unit 123 cannot be maintained in the microcavity enhancement state, thereby reducing the display effect of the display panel. In the related art, the thickness of the sixth electron blocking part 113 is 10-12 times the thickness of the fourth electron blocking part 111.

[0074] In some embodiments of the present application, the charge generation layer 90 includes a first type charge generation layer 91 and a second type charge generation layer 92, and the second type charge generation layer 92 is arranged on the side of the first type charge generation layer 91 away from the first light-emitting layer 60; wherein the first type charge generation layer 91 includes an electron mobility enhancement material, and the doping ratio of the electron mobility enhancement material is 5%-15%; and the second type charge generation layer 92 includes a hole mobility enhancement material, and the doping ratio of the hole mobility enhancement material is 1%-10%.

[0075] The display panel provided by the embodiment of the present application, when the thicknesses of the first, second and third electron blocking parts 51, 52 and 53 are the same, the thicknesses of the second and third electron blocking parts 52 and 53 are equivalent to being thinned, which shortens the path of holes entering the first green light unit 62 and the first red light unit 63, and further affects the balance state of the carriers (including electrons and holes) of the first green light unit 62 and the balance state of the carriers (including electrons and holes) of the first red light unit 63, reduces the light-emitting efficiency of the first green light unit 62 and the first red light unit 63, and shortens the service life of the first green light unit 62 and the first red light unit 63.

[0076] The embodiment of the present application can increase the electron migration rate of the first green light unit 62 and the first red light unit 63 by making the doping proportion of the electron migration rate enhancement material in the first type charge generation layer 91 be 5%-15%, and further improve the balance state of the carriers of the first green light unit 62 and the balance state of the carriers of the first red light unit 63, and further improve the light-emitting efficiency of the first green light unit 62 and the first red light unit 63, prolong the service life of the first green light unit 62 and the first red light unit 63, and can improve the ghosting problem of the display panel in the low gray scale state.

[0077] Specifically, the first type charge generation layer 91 is an N-type charge generation layer 90.

[0078] In some embodiments of the present application, the electron mobility of the first type charge generation layer 91 is greater than or equal to 10 -3 cm 2 Vs, and the electron migration rate enhancement material includes a metal such as Yb, Li, Cs, Mg, etc.

[0079] The display panel provided by the embodiment of the present application, when the thickness of the fifth electron blocking part 112 is 5-7 times the thickness of the fourth electron blocking part 111, and the sixth electron blocking part 113 is 15-17 times the thickness of the fourth electron blocking part 111, the thicknesses of the fifth and sixth electron blocking parts 112 and 113 are equivalent to being thickened, which lengthens the path of holes entering the second green light unit 122 and the second red light unit 123, and further affects the balance state of the carriers (including electrons and holes) of the second green light unit 122 and the balance state of the carriers (including electrons and holes) of the second red light unit 123, reduces the light-emitting efficiency of the second green light unit 122 and the second red light unit 123, and shortens the service life of the second green light unit 122 and the second red light unit 123.

[0080] The application can reduce the electron migration rate of the first green light unit 62 and the first red light unit 63 by setting the doping ratio of the hole migration rate enhancement material in the second type charge generation layer 92 to 1%-10%, thereby improving the balance of carriers of the first green light unit 62 and the balance of carriers of the first red light unit 63, improving the light-emitting efficiency of the first green light unit 62 and the first red light unit 63, prolonging the service life of the first green light unit 62 and the first red light unit 63, and improving the ghosting problem of the display panel in a low gray scale state.

[0081] Specifically, the second type charge generation layer 92 is a P-type charge generation layer 90.

[0082] In some embodiments of the application, the hole migration rate of the second type charge generation layer 92 is greater than or equal to 10 -2 cm 2 Vs, and the hole migration rate enhancement material includes a metal or a metal dopant.

[0083] In some embodiments of the application, the display panel further comprises at least one of a first hole injection layer 30, a first hole transport layer 40, a first hole blocking layer 70, a first electron transport layer 80, a second hole transport layer 100, a second hole blocking layer 130, a second electron transport layer 140, a second electron injection layer 150, and a cap layer 170, wherein the first hole injection layer 30 is disposed on the side of the first electrode layer 20 away from the substrate 10, the first hole transport layer 40 is disposed on the side of the first hole injection layer 30 away from the substrate 10, the first hole blocking layer 70 is disposed on the side of the first light-emitting layer 60 away from the substrate 10, the first electron transport layer 80 is disposed on the side of the first hole blocking layer 70 away from the substrate 10, the second hole transport layer 100 is disposed on the side of the charge generation layer 90 away from the substrate 10, the second hole blocking layer 130 is disposed on the side of the second light-emitting layer 120 away from the substrate 10, the second electron transport layer 140 is disposed on the side of the second hole blocking layer 130 away from the substrate 10, the second electron injection layer 150 is disposed on the side of the second electron transport layer 140 away from the substrate 10, and the cap layer 170 is disposed on the side of the second electrode layer 160 away from the substrate 10.

[0084] In some embodiments of the application, the fourth electron blocking portion 111, the fifth electron blocking portion 112, and the sixth electron blocking portion 113 are arranged at intervals.

[0085] In a second aspect, the embodiment of the present application provides a display device, the display device comprising a housing and the display panel according to any one of the display panels described above, wherein the housing has a receiving space, and the display panel is arranged in the receiving space.

[0086] Embodiment two

[0087] FIG. 2 is a structural schematic diagram of a display panel according to the embodiment two of the present application. Referring to FIG. 2, in a first aspect, the embodiment two of the present application provides a display panel, the display panel comprising a substrate 10, a first electrode layer 20, a first electron blocking layer 50, a first light emitting layer 60, a charge generation layer 90, a second light emitting layer 120, and a second electrode layer 160, wherein the first electrode layer 20 is arranged on one side of the substrate 10, the first electron blocking layer 50 is arranged on a side of the first electrode layer 20 away from the substrate 10, the first light emitting layer 60 is arranged on a side of the first electron blocking layer 50 away from the substrate 10, the charge generation layer 90 is arranged on a side of the first light emitting layer 60 away from the substrate 10, the second light emitting layer 120 is arranged on a side of the charge generation layer 90 away from the substrate 10, and the second electrode layer 160 is arranged on a side of the second light emitting layer 120 away from the substrate 10, wherein the first light emitting layer 60 comprises a first blue light unit 61, a first green light unit 62, and a first red light unit 63, the first electron blocking layer 50 comprises a first electron blocking part 51, a second electron blocking part 52, and a third electron blocking part 53, the first electron blocking part 51 corresponds to the first blue light unit 61, the second electron blocking part 52 corresponds to the first green light unit 62, and the third electron blocking part 53 corresponds to the first red light unit 63, and in the first electron blocking layer 50, the first electron blocking part 51, the second electron blocking part 52, and the third electron blocking part 53 are in an integrated structure.

[0088] It should be noted that the structure of the display panel according to the embodiment two of the present application is similar to the structure of the display panel according to the embodiment one of the present application, and the same parts will not be described herein.

[0089] In some embodiments of the present application, the second light-emitting layer 120 further comprises a second green light unit 122 and a second red light unit 123, and the second electron blocking layer 110 further comprises a fifth electron blocking part 112 corresponding to the second green light unit 122 and a sixth electron blocking part 113 corresponding to the second red light unit 123, wherein the fourth electron blocking part 111, the fifth electron blocking part 112 and the sixth electron blocking part 113 in the second electron blocking layer 110 are of an integrated structure; and the display panel further comprises a third electron blocking layer 180 disposed between the second light-emitting layer 120 and the second electron blocking layer 110, wherein the third electron blocking layer 180 comprises a seventh electron blocking part 181 corresponding to the second green light unit 122 and an eighth electron blocking part 182 corresponding to the second red light unit 123, and the seventh electron blocking part 181 and the eighth electron blocking part 182 are disposed apart from each other.

[0090] In the display panel provided by the embodiments of the present application, because the fourth electron blocking part 111, the fifth electron blocking part 112 and the sixth electron blocking part 113 in the second electron blocking layer 110 are of an integrated structure, and the third electron blocking layer 180 is disposed between the second light-emitting layer 120 and the second electron blocking layer 110, the second electron blocking layer 110 including the fourth electron blocking part 111, the fifth electron blocking part 112 and the sixth electron blocking part 113 can be used as a bearing layer, and the seventh electron blocking part 181 and the eighth electron blocking part 182 can be respectively prepared on the bearing layer, so that the thickness of the seventh electron blocking part 181 and the eighth electron blocking part 182 can be as thin as possible in the case of reducing the thickness of the second electron blocking part 52 and the third electron blocking part 53, thereby reducing the production cost.

[0091] In some embodiments of the present application, the surface of the second blue light unit 121 close to the substrate 10 is in direct contact with the surface of the second electron blocking layer 110 away from the substrate 10.

[0092] In the second aspect, the embodiments of the present application provide a display device, comprising a housing and the display panel according to any one of the above embodiments, wherein the housing has a receiving space, and the display panel is arranged in the receiving space.

[0093] In summary, the application provides a display panel and a display device. The display panel comprises a substrate, a first electrode layer, a first electron blocking layer, a first light-emitting layer, a charge generation layer, a second light-emitting layer, and a second electrode layer. The first electrode layer is arranged on one side of the substrate. The first electron blocking layer is arranged on the side of the first electrode layer away from the substrate. The first light-emitting layer is arranged on the side of the first electron blocking layer away from the substrate. The charge generation layer is arranged on the side of the first light-emitting layer away from the substrate. The second light-emitting layer is arranged on the side of the charge generation layer away from the substrate. The second electrode layer is arranged on the side of the second light-emitting layer away from the substrate. The first light-emitting layer comprises a first blue light unit, a first green light unit, and a first red light unit. The first electron blocking layer comprises a first electron blocking part, a second electron blocking part, and a third electron blocking part. The first electron blocking part corresponds to the first blue light unit. The second electron blocking part corresponds to the first green light unit. The third electron blocking part corresponds to the first red light unit. The first electron blocking part, the second electron blocking part, and the third electron blocking part are in an integrated structure. The display panel can effectively solve the technical problems of complex structure and high production cost of the display panel.

[0094] The above describes the display panel and the display device provided by the embodiments of the application in detail. The principles and implementation manners of the application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the application and the core idea thereof. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the application. In summary, the content of the specification should not be understood as a limitation of the application.

Claims

1. A display panel, wherein, The display panel comprises: a substrate; a first electrode layer arranged on one side of the substrate; a first electron blocking layer arranged on a side of the first electrode layer away from the substrate; a first light-emitting layer arranged on a side of the first electron blocking layer away from the substrate; a charge generation layer arranged on a side of the first light-emitting layer away from the substrate; a second light-emitting layer arranged on a side of the charge generation layer away from the substrate; a second electrode layer arranged on a side of the second light-emitting layer away from the substrate; wherein the first light-emitting layer comprises a first blue light unit, a first green light unit and a first red light unit, and the first electron blocking layer comprises a first electron blocking part corresponding to the first blue light unit, a second electron blocking part corresponding to the first green light unit, and a third electron blocking part corresponding to the first red light unit; wherein the first electron blocking part, the second electron blocking part and the third electron blocking part in the first electron blocking layer are of an integrated structure.

2. The display panel of claim 1, wherein, The second light-emitting layer comprises a second blue light unit, and the display panel further comprises a second electron blocking layer comprising a fourth electron blocking part corresponding to the second blue light unit, the fourth electron blocking part being of the same material as the first electron blocking part.

3. The display panel of claim 2, wherein, The first blue light unit and the second blue light unit each comprise a fluorescent material.

4. The display panel of claim 2, wherein, The second light-emitting layer further comprises a second green light unit, and the second electron blocking layer comprises a fifth electron blocking part corresponding to the second green light unit, the HOMO energy level of the second electron blocking part being higher than the HOMO energy level of the fifth electron blocking part, and the LUMO energy level of the second electron blocking part being lower than the LUMO energy level of the fifth electron blocking part.

5. The display panel of claim 4, wherein, The thickness of the second electron blocking part is the same as the thickness of the first electron blocking part, and the thickness of the fifth electron blocking part is 5-7 times the thickness of the fourth electron blocking part.

6. The display panel of claim 5, wherein, The second light-emitting layer further comprises a second red light unit, and the second electron blocking layer comprises a sixth electron blocking part corresponding to the second red light unit, the HOMO energy level of the third electron blocking part being higher than the HOMO energy level of the sixth electron blocking part, and the LUMO energy level of the third electron blocking part being lower than the LUMO energy level of the sixth electron blocking part.

7. The display panel of claim 6, wherein, The thickness of the third electron blocking part is the same as the thickness of the first electron blocking part, and the sixth electron blocking part is 15-17 times the thickness of the fourth electron blocking part.

8. The display panel of claim 7, wherein, The charge generation layer comprises a first type of charge generation layer and a second type of charge generation layer, and the second type of charge generation layer is arranged on a side of the first type of charge generation layer away from the first light-emitting layer; wherein the first type of charge generation layer comprises an electron mobility enhancement material, and the doping ratio of the electron mobility enhancement material is 5%-15%; and the second type of charge generation layer comprises a hole mobility enhancement material, and the doping ratio of the hole mobility enhancement material is 1%-10%.

9. The display panel of claim 6, wherein, The fourth electron blocking part, the fifth electron blocking part and the sixth electron blocking part are arranged at intervals.

10. The display panel of claim 2, wherein, The second light-emitting layer further comprises a second green light unit and a second red light unit, and the second electron blocking layer further comprises a fifth electron blocking part corresponding to the second green light unit and a sixth electron blocking part corresponding to the second red light unit, wherein the fourth, fifth and sixth electron blocking parts are in an integrated structure in the second electron blocking layer. The display panel further comprises a third electron blocking layer arranged between the second light-emitting layer and the second electron blocking layer, and the third electron blocking layer comprises a seventh electron blocking part corresponding to the second green light unit and an eighth electron blocking part corresponding to the second red light unit, and the seventh and eighth electron blocking parts are arranged in a spaced manner.

11. The display panel of claim 10, wherein, The surface of the second blue light unit close to the substrate directly contacts the surface of the second electron blocking layer away from the substrate.

12. A display device, wherein, The display device comprises a housing and a display panel, the housing has a receiving space, and the display panel is arranged in the receiving space, and the display panel comprises: a substrate; a first electrode layer arranged on one side of the substrate; a first electron blocking layer arranged on a side of the first electrode layer away from the substrate; a first light-emitting layer arranged on a side of the first electron blocking layer away from the substrate; a charge generation layer arranged on a side of the first light-emitting layer away from the substrate; a second light-emitting layer arranged on a side of the charge generation layer away from the substrate; a second electrode layer arranged on a side of the second light-emitting layer away from the substrate; wherein the first light-emitting layer comprises a first blue light unit, a first green light unit and a first red light unit, the first electron blocking layer comprises a first electron blocking part corresponding to the first blue light unit, a second electron blocking part corresponding to the first green light unit and a third electron blocking part corresponding to the first red light unit, and the first, second and third electron blocking parts are in an integrated structure in the first electron blocking layer.

13. The display device of claim 12, wherein, The second light-emitting layer comprises a second blue light unit, and the display panel further comprises a second electron blocking layer comprising a fourth electron blocking part corresponding to the second blue light unit, and the fourth electron blocking part has the same material as the first electron blocking part.

14. The display device of claim 13, wherein, The first and second blue light units each comprise a fluorescent material.

15. The display device of claim 13, wherein, The second light-emitting layer further comprises a second green light unit, and the second electron blocking layer comprises a fifth electron blocking part corresponding to the second green light unit, the HOMO energy level of the second electron blocking part is higher than that of the fifth electron blocking part, and the LUMO energy level of the second electron blocking part is lower than that of the fifth electron blocking part.

16. The display device of claim 15, wherein, The thickness of the second electron blocking part is the same as that of the first electron blocking part, and the thickness of the fifth electron blocking part is 5-7 times the thickness of the fourth electron blocking part.

17. The display device of claim 16, wherein, The second light-emitting layer further comprises a second red light unit, wherein the second electron blocking layer comprises a sixth electron blocking part corresponding to the second red light unit, the HOMO energy level of the third electron blocking part is greater than the HOMO energy level of the sixth electron blocking part, and the LUMO energy level of the third electron blocking part is less than the LUMO energy level of the sixth electron blocking part.

18. The display device of claim 17, wherein, The thickness of the third electron blocking part is the same as the thickness of the first electron blocking part, and the sixth electron blocking part is 15-17 times the thickness of the fourth electron blocking part.

19. The display device of claim 18, wherein, The charge generation layer comprises a first type charge generation layer and a second type charge generation layer, and the second type charge generation layer is arranged on the side of the first type charge generation layer away from the first light-emitting layer. The first type charge generation layer comprises an electron mobility enhancement material, and the doping ratio of the electron mobility enhancement material is 5%-15%; and the second type charge generation layer comprises a hole mobility enhancement material, and the doping ratio of the hole mobility enhancement material is 1%-10%.

20. The display device of claim 13, wherein, The second light-emitting layer further comprises a second green light unit and a second red light unit, and the second electron blocking layer further comprises a fifth electron blocking part corresponding to the second green light unit and a sixth electron blocking part corresponding to the second red light unit, wherein the fourth electron blocking part, the fifth electron blocking part and the sixth electron blocking part in the second electron blocking layer are of an integrated structure. The display panel further comprises a third electron blocking layer arranged between the second light-emitting layer and the second electron blocking layer, and the third electron blocking layer comprises a seventh electron blocking part corresponding to the second green light unit and an eighth electron blocking part corresponding to the second red light unit, and the seventh electron blocking part and the eighth electron blocking part are arranged at intervals.