Laminated OLED device and OLED panel
By introducing patterned P-type charge generation layer and partition gap into the stacked OLED device, the inter-pixel crosstalk problem during low-brightness and low-grey-grade display is solved, and the display quality and user experience are improved.
Patent Information
- Application Number
- CN202421255978.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-06-03
AI Technical Summary
The stacked OLED device has crosstalk between pixels when displaying low brightness and low grayscale, resulting in reduced color accuracy and color castration of white pictures, affecting the user experience.
By introducing a patterned P-type charge generation layer into the OLED device and forming a partition gap therebetween, lateral crosstalk between sub-pixels is blocked.
It effectively improves the display quality, reduces process steps, and improves the low grayscale display effect.
Smart Images
Figure CN222621544U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of OLED devices, in particular to a laminated OLED device and an OLED panel. Background Art
[0002] In recent years, OLED devices have been increasingly used in display fields such as wearables, mobile phones, tablets, cars, and televisions. Among them, stacked OLED devices have developed rapidly due to their advantages such as high brightness and long life. However, since stacked OLED devices have a high-conductivity charge generation layer, there is more serious crosstalk between pixels (or sub-pixels) when displaying low brightness and low grayscale, which is manifested as reduced color accuracy of low grayscale and color cast of white screens, which gives consumers a poor user experience.
[0003] In the prior art, isolation columns or isolation grooves are usually used to isolate the charge generation layer to block the current crosstalk between pixels (or sub-pixels). However, this method requires at least one additional photomask and one additional process in the panel process. And because the height of the isolation column or the depth of the isolation groove is at the um level, the cathode will be partially disconnected while the charge generation is blocked, which will cause the cathode conductivity to decrease and the operating voltage of the display panel to increase. In low-brightness and low-grayscale application scenarios, there is obvious display unevenness due to inconsistent cathode conductivity, which increases costs and seriously affects the low-grayscale display effect.
[0004] In view of the above-mentioned defects, the present invention proposes a stacked OLED device and an OLED panel. Utility Model Content
[0005] In response to the problems in the prior art, the purpose of the present invention is to provide a stacked OLED device and an OLED panel, which overcome the difficulties of the prior art and can block the lateral crosstalk between sub-pixels based on the charge generation layer by isolating gaps, thereby improving display quality and reducing the manufacturing process.
[0006] The embodiment of the utility model provides a stacked OLED device, comprising:
[0007] An anode layer, a hole layer, a first light-emitting layer, a first electron transport layer, an N-type charge generation layer, a second light-emitting layer, a second electron transport layer and a cathode are stacked;
[0008] The first light-emitting layer and the second light-emitting layer each include a plurality of mutually independent sub-pixel light-emitting layers, and each sub-pixel light-emitting layer in the first light-emitting layer and the sub-pixel light-emitting layer of the same color as the second light-emitting layer are stacked up and down in the same pixel opening of the pixel definition layer, and the second light-emitting layer also includes a P-type charge generation layer located between the N-type charge generation layer and the sub-pixel light-emitting layer, and the P-type charge generation layer is distributed in an island shape, and a first combination pattern of the sub-pixel light-emitting layer of the second light-emitting layer and a second combination pattern of the P-type charge generation layer overlap, and a number of anti-crosstalk isolation gaps are formed between adjacent P-type charge generation layers.
[0009] Preferably, the second light-emitting layer includes a second blue light-emitting layer, a second green light-emitting layer and a second red light-emitting layer and corresponding first P-type charge generation layer, second P-type charge generation layer and third P-type charge generation layer respectively, the thickness of the first P-type charge generation layer is less than the thickness of the second P-type charge generation layer, and the thickness of the second P-type charge generation layer is less than the thickness of the third P-type charge generation layer.
[0010] Preferably, the thickness of the first P-type charge generating layer is The thickness of the second P-type charge generation layer is The thickness of the third P-type charge generation layer is
[0011] Preferably, the projection pattern of the first P-type charge generation layer based on the substrate overlaps with the projection pattern of the second blue light-emitting layer based on the substrate, the projection pattern of the second P-type charge generation layer based on the substrate overlaps with the projection pattern of the second green light-emitting layer based on the substrate, and the projection pattern of the third P-type charge generation layer based on the substrate overlaps with the projection pattern of the second red light-emitting layer based on the substrate.
[0012] Preferably, the cavity layer comprises:
[0013] a hole transport layer formed on one side of the anode layer; and
[0014] The hole injection layer is formed on the side of the hole transport layer away from the anode layer.
[0015] Preferably, it also includes: an electron blocking layer located between the hole layer and the first light-emitting layer.
[0016] Preferably, the first light-emitting layer includes a first blue light-emitting layer, a first green light-emitting layer and a first red light-emitting layer.
[0017] Preferably, the projection pattern of the first P-type charge generation layer based on the substrate overlaps with the projection pattern of the first blue light-emitting layer based on the substrate, the projection pattern of the second P-type charge generation layer based on the substrate overlaps with the projection pattern of the first green light-emitting layer based on the substrate, and the projection pattern of the third P-type charge generation layer based on the substrate overlaps with the projection pattern of the first red light-emitting layer based on the substrate.
[0018] Preferably, it further comprises: a light extraction layer formed on a side of the cathode away from the second electron transport layer.
[0019] Preferably, the combined pattern of the partition gaps is included in the projection pattern of the pixel definition layer based on the substrate.
[0020] An embodiment of the utility model further provides an OLED panel, comprising: the stacked OLED device as described above.
[0021] The utility model can block the lateral crosstalk between sub-pixels based on the charge generation layer by separating the gaps, thereby improving the display quality and reducing the manufacturing process. Based on the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the utility model.
[0022] To further understand the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. However, the detailed description and drawings here are only used to illustrate the present application and do not impose any limitations on the scope of the claims of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.
[0024] Figure 1 It is a cross-sectional schematic diagram of a stacked OLED device according to an embodiment of the present utility model.
[0025] Reference numerals
[0026] 1 Anode layer
[0027] 2 Hole layer
[0028] 21. Hole transport layer
[0029] 22 Hole injection layer
[0030] 3 Electron blocking layer
[0031] 4. First light-emitting layer
[0032] 41. First blue light emitting layer
[0033] 42. First green light emitting layer
[0034] 43. First red light emitting layer
[0035] 5. First electron transport layer
[0036] 6 N-type charge generation layer
[0037] 71 First P-type charge generation layer
[0038] 72 Second P-type charge generation layer
[0039] 73 Third P-type charge generation layer
[0040] 8 Second light-emitting layer
[0041] 81 Second blue light emitting layer
[0042] 82 Second green light emitting layer
[0043] 83 Second red light emitting layer
[0044] 9 Second electron transport layer
[0045] 10 Cathode
[0046] 11 Light Extraction Layer
[0047] 12 Partition Gap DETAILED DESCRIPTION
[0048] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific implementation methods, and the details in the present application can also be modified or changed in various ways according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0049] The following is a detailed description of the embodiments of the present application with reference to the accompanying drawings so that those skilled in the art can easily implement the present application. The present application can be embodied in a variety of different forms and is not limited to the embodiments described herein.
[0050] In the representations of the present application, the representations with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the represented specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples, unless they contradict each other.
[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0052] In order to clearly describe the present application, components irrelevant to the description are omitted, and the same reference symbols are given to the same or similar components throughout the specification.
[0053] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.
[0054] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.
[0055] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.
[0056] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present application. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.
[0057] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which this application belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the relevant technical literature and the contents of the current disclosure, and unless defined, shall not be overly interpreted as ideal or very formal meanings.
[0058] Figure 1 FIG. 1 is a cross-sectional schematic diagram of a stacked OLED device according to an embodiment of the present utility model. Figure 1As shown, this embodiment provides a stacked OLED device, including: a stacked substrate (not shown in the figure), an anode layer 1, a hole layer 2, a first light-emitting layer 4, a first electron transport layer 5, an N-type charge generation layer 6, a second light-emitting layer 8, a second electron transport layer 9 and a cathode 10. The first light-emitting layer 4 and the second light-emitting layer 8 are each composed of a plurality of mutually independent sub-pixel light-emitting layers, each sub-pixel light-emitting layer in the first light-emitting layer 4 and a sub-pixel light-emitting layer of the same color of the second light-emitting layer 8 are stacked up and down in the same pixel opening of the pixel definition layer, and the second light-emitting layer 8 also includes a P-type charge generation layer located between the N-type charge generation layer 6 and the sub-pixel light-emitting layer, the P-type charge generation layer is distributed in an island shape, and the first combination pattern of the sub-pixel light-emitting layer of the second light-emitting layer 8 and the second combination pattern of the P-type charge generation layer overlap, and a plurality of anti-crosstalk partition gaps 12 are formed between adjacent P-type charge generation layers. The utility model can block the lateral crosstalk between sub-pixels based on the charge generation layer through the partition gap, thereby improving the display quality and reducing the manufacturing process.
[0059] In a preferred embodiment, the second light-emitting layer 8 includes a second blue light-emitting layer 81, a second green light-emitting layer 82, and a second red light-emitting layer 83 and corresponding first P-type charge generation layer 71, second P-type charge generation layer 72, and third P-type charge generation layer 73, respectively. The thickness of the first P-type charge generation layer 71 is less than the thickness of the second P-type charge generation layer 72, and the thickness of the second P-type charge generation layer 72 is less than the thickness of the third P-type charge generation layer 73, but is not limited to this.
[0060] In a preferred embodiment, the thickness of the first P-type charge generation layer 71 is The thickness of the second P-type charge generation layer 72 is The thickness of the third P-type charge generation layer 73 is But it is not limited to this.
[0061] In a preferred embodiment, the projection pattern of the first P-type charge generation layer 71 based on the substrate overlaps with the projection pattern of the second blue light-emitting layer 81 based on the substrate, the projection pattern of the second P-type charge generation layer 72 based on the substrate overlaps with the projection pattern of the second green light-emitting layer 82 based on the substrate, and the projection pattern of the third P-type charge generation layer 73 based on the substrate overlaps with the projection pattern of the second red light-emitting layer 83 based on the substrate, but is not limited to this.
[0062] In a preferred embodiment, the cavity layer 2 comprises:
[0063] The hole transport layer 21 is formed on one side of the anode layer 1. And
[0064] The hole injection layer 22 is formed on a side of the hole transport layer 21 away from the anode layer 1 , but the present invention is not limited thereto.
[0065] In a preferred embodiment, it further comprises: an electron blocking layer 3 located between the hole layer 2 and the first light-emitting layer 4, but the present invention is not limited thereto.
[0066] In a preferred embodiment, the first light-emitting layer 4 includes a first blue light-emitting layer 41 , a first green light-emitting layer 42 and a first red light-emitting layer 43 , but is not limited thereto.
[0067] In a preferred embodiment, the projection pattern of the first P-type charge generation layer 71 based on the substrate overlaps with the projection pattern of the first blue light-emitting layer 41 based on the substrate, the projection pattern of the second P-type charge generation layer 72 based on the substrate overlaps with the projection pattern of the first green light-emitting layer 42 based on the substrate, and the projection pattern of the third P-type charge generation layer 73 based on the substrate overlaps with the projection pattern of the first red light-emitting layer 43 based on the substrate, but is not limited to this.
[0068] In a preferred embodiment, it further includes: a light extraction layer 11 formed on a side of the cathode 10 away from the second electron transport layer 9, but not limited thereto.
[0069] See also Figure 1 In the present invention, a first P-type charge generation layer 71 of a first pattern is first formed by reusing a first FMM mask corresponding to a sub-pixel light-emitting layer of a first color, and then a second blue light-emitting layer 81 is formed on the first P-type charge generation layer 71, and then the second FMM mask corresponding to the sub-pixel light-emitting layer of the second color and the third FMM mask corresponding to the sub-pixel light-emitting layer of the third color are respectively reused to form a second P-type charge generation layer 72 and a second green light-emitting layer 82 in a stacked state with the second pattern, and a third P-type charge generation layer 73 and a second red light-emitting layer 83 in a stacked state with the third pattern. Among them, the partition gap 12 is formed by using sub-pixel light-emitting layers of different colors to form the gaps between the first pattern, the second pattern and the third pattern, respectively, without adding additional processes, it can prevent lateral crosstalk between different sub-pixels through the whole-piece P-type charge generation layer, improve the display quality of the OLED display device and reduce the process of the OLED display device.
[0070] The utility model replaces the traditional combination of P-CGL and TG, TR, TB with a patterned P-type charge generation layer. The patterned P-type charge generation layer has both the charge generation capability of P-CGL and the hole transmission capability. Moreover, it has the advantage that one less CMM film plate is required for evaporation. At the same time, since the P-type charge generation layers corresponding to the RGB pixels are respectively deposited by FMM (fine metal mask) evaporation, the crosstalk between RGB through CGL can be greatly reduced, thereby improving the display effect. The P-type charge generation layer can be a single film layer evaporated by one element, or a doped film layer evaporated by multiple elements. The composition ratio of the P-type charge generation layer can be adjusted individually according to the different photoelectric characteristics of the RGB devices, thereby improving the overall performance of the device.
[0071] In the first embodiment, a panel with a P-type charge generation layer is stacked in sequence by using an evaporation method, wherein the P-type charge generation layer is a hole transport material doped with 2% NPD-9, which can be used to adjust the microcavity. The thickness of the first P-type charge generation layer 71 is The thickness of the second P-type charge generation layer 72 is The thickness of the third P-type charge generation layer 73 is
[0072] In the second embodiment, a panel having a P-type charge generation layer is stacked in sequence by using an evaporation method, wherein the P-type charge generation layer is a hole transport material NPD-9. To adjust the operating voltage, the doping ratio of the hole transport material NPD-9 of the first P-type charge generation layer 71 corresponding to the second blue light-emitting layer 81 is 4%, the doping ratio of the hole transport material NPD-9 of the second P-type charge generation layer 72 corresponding to the second green light-emitting layer 82 is 2%, and the doping ratio of the hole transport material NPD-9 of the third P-type charge generation layer 73 corresponding to the second red light-emitting layer 83 is 2%. The thickness of the first P-type charge generation layer 71 is The thickness of the second P-type charge generation layer 72 is The thickness of the third P-type charge generation layer 73 is The RGB working voltage in the panel is reduced.
[0073] The following table compares the test results of the panel of the first embodiment and the panel of the second embodiment:
[0074]
[0075] Compared with a traditional panel, the stacked OLED device of the present invention has a lower panel operating cross-voltage and a larger DCI-P3 color gamut coverage percentage.
[0076] This embodiment also provides an OLED panel, including: the above-mentioned laminated OLED device. The OLED panel of the utility model includes the structural features, technology and effects of the above-mentioned laminated OLED device, which will not be described in detail here.
[0077] In summary, the utility model can block the lateral crosstalk between sub-pixels based on the charge generation layer by separating the gaps, thereby improving the display quality and reducing the manufacturing process.
[0078] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A stacked OLED device, characterized in that: include: An anode layer (1), a hole layer (2), a first light-emitting layer (4), a first electron transport layer (5), an N-type charge generation layer (6), a second light-emitting layer (8), a second electron transport layer (9) and a cathode (10) are stacked; The first light-emitting layer (4) and the second light-emitting layer (8) each include a plurality of mutually independent sub-pixel light-emitting layers, each of the sub-pixel light-emitting layers in the first light-emitting layer (4) and the sub-pixel light-emitting layer of the same color in the second light-emitting layer (8) are stacked up and down in the same pixel opening of the pixel definition layer, the second light-emitting layer (8) also includes a P-type charge generation layer located between the N-type charge generation layer (6) and the sub-pixel light-emitting layer, the P-type charge generation layer is distributed in an islanded manner, and a first combination pattern of the sub-pixel light-emitting layers of the second light-emitting layer (8) and a second combination pattern of the P-type charge generation layer overlap, and a plurality of crosstalk-preventing isolation gaps (12) are formed between adjacent P-type charge generation layers.
2. The OLED device according to claim 1, characterized in that The second light-emitting layer (8) comprises a second blue light-emitting layer (81), a second green light-emitting layer (82) and a second red light-emitting layer (83) and respectively corresponding to a first P-type charge generating layer (71), a second P-type charge generating layer (72) and a third P-type charge generating layer (73); the thickness of the first P-type charge generating layer (71) is smaller than the thickness of the second P-type charge generating layer (72), and the thickness of the second P-type charge generating layer (72) is smaller than the thickness of the third P-type charge generating layer (73).
3. The OLED device according to claim 2, characterized in that The thickness of the first P-type charge generation layer (71) is The thickness of the second P-type charge generation layer (72) is The thickness of the third P-type charge generation layer (73) is 4. The OLED device according to claim 2, characterized in that The projection pattern of the first P-type charge generating layer (71) based on the substrate overlaps with the projection pattern of the second blue light-emitting layer (81) based on the substrate, the projection pattern of the second P-type charge generating layer (72) based on the substrate overlaps with the projection pattern of the second green light-emitting layer (82) based on the substrate, and the projection pattern of the third P-type charge generating layer (73) based on the substrate overlaps with the projection pattern of the second red light-emitting layer (83) based on the substrate.
5. The OLED device according to claim 1, characterized in that The cavity layer (2) comprises: a hole transport layer (21) formed on one side of the anode layer (1); and A hole injection layer (22) is formed on a side of the hole transport layer (21) that is away from the anode layer (1).
6. The OLED device according to claim 1, characterized in that Also includes: The electron blocking layer (3) is located between the hole layer (2) and the first light-emitting layer (4).
7. The OLED device according to claim 2, characterized in that The first light-emitting layer (4) comprises a first blue light-emitting layer (41), a first green light-emitting layer (42) and a first red light-emitting layer (43).
8. The OLED device according to claim 7, characterized in that The projection pattern of the first P-type charge generating layer (71) based on the substrate overlaps with the projection pattern of the first blue light-emitting layer (41) based on the substrate, the projection pattern of the second P-type charge generating layer (72) based on the substrate overlaps with the projection pattern of the first green light-emitting layer (42) based on the substrate, and the projection pattern of the third P-type charge generating layer (73) based on the substrate overlaps with the projection pattern of the first red light-emitting layer (43) based on the substrate.
9. The OLED device according to claim 1, characterized in that Also includes: A light extraction layer (11) is formed on a side of the cathode (10) facing away from the second electron transport layer (9).
10. An OLED panel, characterized in that: include: The stacked OLED device as claimed in claim 1.