CN111415966A - Organic light emitting diode device and display device - Google Patents
Organic light emitting diode device and display device Download PDFInfo
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- CN111415966A CN111415966A CN202010311413.7A CN202010311413A CN111415966A CN 111415966 A CN111415966 A CN 111415966A CN 202010311413 A CN202010311413 A CN 202010311413A CN 111415966 A CN111415966 A CN 111415966A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/856—Arrangements for extracting light from the devices comprising reflective means
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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Abstract
The invention provides an organic light-emitting diode device and a display device. The light-emitting diode device is added with the light-reflecting layer made of the nanoscale light-reflecting material and used for reflecting light rays transmitted by the light-emitting layer towards one side of the anode layer, so that the light rays of the light-emitting layer are all emitted from one side of the cathode layer, the light-emitting efficiency is improved, the display brightness is improved, the product thickness is reduced, the organic light-emitting diode device is further beneficial to being lower in energy consumption when being used in an outdoor strong light environment, and the service life of the organic light-emitting diode device is prolonged.
Description
Technical Field
The invention relates to the field of display, in particular to an organic light emitting diode device and a display device.
Background
An Organic light Emitting Diode (Organic L light Emitting Diode, O L ED) is also called as Organic electroluminescent display, Organic light Emitting semiconductor, O L ED display technology has advantages of self-luminescence, wide viewing angle, almost infinite contrast, low power consumption, extremely high response speed, etc. however, the technology is immature, resulting in low yield of products and high cost, and therefore, the technology cannot compete with a liquid crystal display panel effectively in price.
Referring to fig. 1, a basic structure of a conventional organic light emitting diode device is shown, in which an organic light emitting diode device 90 is formed by connecting a thin and transparent Indium Tin Oxide (ITO) with semiconductor characteristics as an anode 91 to an anode of a power supply 96, and further connecting another metal cathode 95 to a cathode of the power supply 96, so as to form a sandwich structure, the entire structure between the anode 91 and the metal cathode 95 includes a hole transport layer (HT L) 92, a light emitting layer (E L) 93 and an electron transport layer (ET L) 94, when the power supply 96 is supplied with a proper voltage, positive holes and cathode charges combine in the light emitting layer 93 to generate light, which generates three primary colors of red, green and blue depending on the material, so as to form a basic color of a display screen, and the propagation direction of the emitted light is indicated by arrows in fig. 1.
Since the organic light emitting diode device is self-luminous, unlike the liquid crystal display panel which requires a backlight, it has high visibility and brightness, low voltage requirement, high power saving efficiency, fast response, light weight, thin thickness, simple structure, low cost, etc., and is considered as one of the most promising products in the 21 st century.
However, when the organic light emitting diode device is used in an outdoor strong light environment, how to further improve the brightness, reduce the energy consumption, reduce the thickness and reduce the electron transmittance on the existing basis so as to achieve the purposes of prolonging the service life of the product and reducing the energy consumption in use becomes a research direction.
Disclosure of Invention
The invention aims to provide an organic light-emitting diode device and a display device, and the light-emitting efficiency is improved, the display brightness is improved, and the product thickness is reduced by adding a light-reflecting layer made of a nanoscale light-reflecting material, so that the organic light-emitting diode device is more favorable for being used in an outdoor strong light environment, the energy consumption is lower, and the service life of the organic light-emitting diode device is prolonged.
In order to solve the above problems, an embodiment of the present invention provides an organic light emitting diode device, which includes an anode layer, a light reflecting layer, a light emitting layer, and a cathode layer sequentially stacked from bottom to top. Specifically, the light emitting layer is arranged on the anode layer; the cathode layer is arranged on the light emitting layer; the light reflecting layer is arranged between the anode layer and the light emitting layer.
Furthermore, the light reflecting layer is provided with a plurality of light reflecting units, the light emitting layer is provided with a plurality of pixel units, and each light reflecting unit corresponds to one pixel unit.
Further, the material used for the light reflecting unit is a nanoscale light reflecting material.
Furthermore, the light reflecting layer comprises a substrate and a slot on the substrate, and the light reflecting unit is arranged in the slot.
Further, the shape and size of the pixel unit are matched with the shape and size of the light reflecting unit.
Furthermore, the pixel units are in an elliptical sphere shape, and concave mirror structures are arranged on one sides of the light reflecting units facing the pixel units.
Further, the focal point of the concave mirror structure coincides with the central point position of the pixel unit correspondingly arranged on the concave mirror structure.
Further, the pixel units comprise a red pixel unit, a green pixel unit and a blue pixel unit; the light reflecting layer is provided with a first light reflecting unit, a second light reflecting unit and a third light reflecting unit which respectively correspond to the red pixel unit, the green pixel unit and the blue pixel unit.
Further, the organic light emitting diode device further comprises a hole transport layer and an electron transport layer; the hole transport layer is arranged between the anode layer and the light reflecting layer; the electron transport layer is disposed between the light emitting layer and the cathode layer.
The invention also provides a display device comprising the organic light-emitting diode device.
The invention has the advantages that the light reflecting layer made of the nanoscale light reflecting material is added and is used for reflecting light rays of the light emitting layer which are transmitted towards one side of the anode layer, so that the light rays of the light emitting layer are all emitted from one side of the cathode layer, the light emitting efficiency is improved, the display brightness is improved, the product thickness is reduced, the organic light emitting diode device is more beneficial to being used in an outdoor strong light environment, the energy consumption is lower, and the service life of the organic light emitting diode device is prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a conventional organic light emitting diode device;
fig. 2 is a schematic structural diagram of an organic light emitting diode device according to a first embodiment of the present invention;
FIG. 3 is a schematic structural view of the light-reflecting layer and the light-emitting layer of FIG. 2 disposed opposite to each other;
fig. 4 is a schematic structural view of the light-reflecting layer and the light-emitting layer disposed opposite to each other in a second embodiment of the present invention;
fig. 5 is a schematic diagram of the light-reflecting layer reflecting the light of the light-emitting layer according to the second embodiment of the present invention.
The components in the figure are identified as follows:
1. an anode layer, 2, a hole transport layer, 3, a reflecting layer, 4, a light-emitting layer,
5. an electron transport layer, 6, a cathode layer, 10, an organic light emitting diode device,
20. a power supply, 30, a concave mirror structure, 31, a first light reflecting unit,
32. a second light reflecting unit 33, a third light reflecting unit 34, a substrate,
35. a slot 41, a red pixel unit, 42, a green pixel unit,
43. and a blue pixel unit.
Detailed Description
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. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Example 1
Referring to fig. 2, a first embodiment of the invention provides an organic light emitting diode device 10, which includes an anode layer 1, a reflective layer 3, a light emitting layer 4, and a cathode layer 6 stacked in sequence from bottom to top. Specifically, the light emitting layer 4 is disposed on the anode layer 1; the cathode layer 6 is arranged on the light-emitting layer 4; the light reflecting layer 3 is arranged between the anode layer 1 and the light emitting layer 4.
In this embodiment, the anode layer 1 is made of ito, has thin and transparent semiconductor characteristics, and is connected to the positive electrode of a power supply 20; the material of the cathode layer 6 comprises metal, and is a metal electrode connected to the negative electrode of the power supply 20. When the power source 20 supplies a suitable voltage, positive holes and cathode charges are combined in the light emitting layer 4, and light is emitted.
The propagation direction of the emitted light is indicated by arrows in fig. 2, and most of the light propagates in the direction of the thick arrows and exits from the cathode layer 6 side; another small part of the light travels in the direction of the thin arrows towards the anode layer 1 side and is reflected when it reaches the light-reflecting layer 3, thereby changing the direction of travel and exiting from the cathode layer 6 side. Like this, the light that the reflection of light layer 3 propagated through the orientation anode layer 1 one side of reflection luminescent layer 4 to make the light of luminescent layer 4 all from the outgoing of cathode layer 6 one side, promote product energy availability factor, thereby promoted luminous efficacy, promoted display luminance, reduced product thickness, and then more do benefit to organic light emitting diode device 10 energy consumption when using under outdoor highlight environment is lower, has improved organic light emitting diode device 10's life-span.
Referring to fig. 2, in the present embodiment, the organic light emitting diode device 10 further includes a hole transport layer 2 and an electron transport layer 5; the hole transport layer 2 is arranged between the anode layer 1 and the light reflecting layer 3; the electron transport layer 5 is provided between the light emitting layer 4 and the cathode layer 6. The hole transport layer 2 is used to transport positive holes, and the electron transport layer 5 is used to transport negative charges, so that transport efficiency can be improved.
In this embodiment, the light-reflecting layer has a plurality of light-reflecting units, and the light-emitting layer has a plurality of pixel units, each light-reflecting unit corresponding to a pixel unit. Specifically, the pixel units in the light-emitting layer 4 include a red pixel unit 41, a green pixel unit 42, and a blue pixel unit 43; the light reflecting layer 3 is provided with light reflecting units such as a first light reflecting unit 31, a second light reflecting unit 32, a third light reflecting unit 33, and the like, which correspond to the red pixel unit 41, the green pixel unit 42, and the blue pixel unit 43, respectively. The red pixel unit 41, the green pixel unit 42, and the blue pixel unit 43 generate three primary colors of red, green, and blue due to different materials, and form a basic color of a display screen. The first light reflecting unit 31, the second light reflecting unit 32, and the third light reflecting unit 33 correspond to the red pixel unit 41, the green pixel unit 42, and the blue pixel unit 43, respectively, so that light can be reflected better.
In this embodiment, the first light reflecting unit 31, the second light reflecting unit 32, and the third light reflecting unit 33 are made of a nano-scale light reflecting material, that is, the light reflecting unit is made of a nano-scale light reflecting material, and can reflect light more due to its compact structural characteristics.
Referring to fig. 3, in the present embodiment, the light reflecting layer 3 includes a substrate 34 and a slot 35 located on the substrate 34, and the light reflecting units are disposed in the slot 35, that is, the first light reflecting unit 31, the second light reflecting unit 32, and the third light reflecting unit 33 are disposed in the slot 35. The first light reflecting unit 31, the second light reflecting unit 32, and the third light reflecting unit 33 correspond to the red pixel unit 41, the green pixel unit 42, and the blue pixel unit 43, respectively, so that the manufacturing cost of the first light reflecting unit 31, the second light reflecting unit 32, and the third light reflecting unit 33 can be saved, and a good light reflecting effect can be achieved.
The shape and size of the slot 35 are the same as those of the projections of the red pixel unit 41, the green pixel unit 42, and the blue pixel unit 43. It is understood that the slots 35 are used for filling a nanoscale light-reflecting material to form the first light-reflecting units 31, the second light-reflecting units 32 and the third light-reflecting units 33, and the shapes and the sizes of the slots 35 determine the shapes and the sizes of the first light-reflecting units 31, the second light-reflecting units 32 and the third light-reflecting units 33, so that the first light-reflecting units 31, the second light-reflecting units 32 and the third light-reflecting units 33 are respectively arranged corresponding to the red pixel units 41, the green pixel units 42 and the blue pixel units 43.
Example 2
Referring to fig. 4, the second embodiment includes all the technical features of the first embodiment, and the difference is that concave mirror structures 30 are further disposed on the sides of the first light reflecting unit 31, the second light reflecting unit 32, and the third light reflecting unit 33 facing the red pixel unit 41, the green pixel unit 42, and the blue pixel unit 43 in the second embodiment.
As shown in fig. 4, the light reflecting unit has an oval spherical shape, that is, the red pixel unit 41, the green pixel unit 42, and the blue pixel unit 43 all have oval spherical shapes. The light reflecting units face towards one side of the pixel units, namely, concave mirror structures 30 are arranged on one sides of the first light reflecting units 31, the second light reflecting units 32 and the third light reflecting units 33, facing towards the red pixel units 41, the green pixel units 42 and the blue pixel units 43.
Referring to fig. 4 and 5, in the present embodiment, the shape and size of the pixel unit are matched with the shape and size of the light reflecting unit. The fitting means that when the outer surface of the shape of the pixel unit is in a first arc shape, the outer surfaces of the light reflecting unit corresponding to the pixel unit are also in a second arc shape, and the first arc shape and the second arc shape are arranged in parallel, namely, the distance between the first arc shape and the second arc shape is equal.
The arc-shaped spherical surfaces of the concave mirror structures 30 correspond to the arc-shaped spherical surfaces of the oval spheres of the red pixel units 41, the green pixel units 42 and the blue pixel units 43 one by one respectively. The concave mirror structure 30 is provided to avoid interference between the light beams reflected below the red pixel unit 41, the green pixel unit 42 and the blue pixel unit 43, and avoid the mirror reflection causing the transition between the front viewing angle luminance and the side viewing angle luminance to be too obvious.
Referring to fig. 4 and 5, in the present embodiment, a focal point of the concave mirror structure 30 coincides with a central point of the pixel unit correspondingly disposed thereon, that is, central points of the red pixel unit 41, the green pixel unit 42, and the blue pixel unit 43 all coincide with a focal point of the concave mirror structure 30 disposed thereon. Therefore, when the light rays emitted by the red pixel unit 41, the green pixel unit 42 and the blue pixel unit 43 in the elliptical spherical shape are respectively transmitted to the concave mirror structure 30 of the first light reflecting unit 31, the second light reflecting unit 32 and the third light reflecting unit 33, the reflected light rays can form parallel light rays perpendicular to the cathode layer 6, and then the reflected parallel light rays are emitted from one side of the cathode layer 6, so that interference among the reflected light rays below the red pixel unit 41, the green pixel unit 42 and the blue pixel unit 43 is avoided, and the transition between the display front view angle brightness and the side view angle brightness caused by mirror reflection is avoided being too obvious. The embodiment utilizes the concave mirror principle to disperse and reflect light, and the surrounding pixels do not reflect light to form interference, so that the visual angle of the product is increased. Therefore, light rays of the light emitting layer 4 are all emitted from one side of the cathode layer 6, the light emitting efficiency is improved, the display brightness is improved, the organic light emitting diode device 10 is more beneficial to lower energy consumption when being used in an outdoor strong light environment, and the service life of the organic light emitting diode device 10 is prolonged.
In addition, a multi-surface mirror surface is adopted, namely a plurality of concave mirror structures 30 are arranged, so that the light reflecting area is reduced, and the reflecting effect can be better realized. And the concave mirror structure 30 is arranged to fill the red pixel unit 41, the green pixel unit 42 and the blue pixel unit 43 in the elliptical spherical shape into the concave surface of the concave mirror structure 30, which is beneficial to reducing the overall thickness of the organic light emitting diode device 10.
The present invention also provides a display device comprising the above organic light emitting diode device 10.
The display device in this embodiment may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The working principle of the display device provided in this embodiment is the same as the working principle of the organic light emitting diode device 10 in the foregoing embodiment, and specific structural relationships and working principles refer to the foregoing embodiment of the organic light emitting diode device 10, which is not described herein again.
The invention has the advantages that the light reflecting layer 3 made of the nanoscale light reflecting material is added to reflect the light rays of the light emitting layer 4 which are transmitted towards one side of the anode layer 1, so that the light rays of the light emitting layer 4 are all emitted from one side of the cathode layer 6, the light emitting efficiency is improved, the display brightness is improved, the product thickness is reduced, the organic light emitting diode device 10 is more beneficial to being used in an outdoor strong light environment, the energy consumption is lower, and the service life of the organic light emitting diode device 10 is prolonged.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An organic light emitting diode device, comprising:
an anode layer;
a light emitting layer disposed on the anode layer;
a cathode layer disposed on the light emitting layer; and
and the light reflecting layer is arranged between the anode layer and the light emitting layer.
2. The organic light-emitting diode device according to claim 1,
the light-reflecting layer is provided with a plurality of light-reflecting units, the light-emitting layer is provided with a plurality of pixel units, and each light-reflecting unit corresponds to one pixel unit.
3. The organic light emitting diode device according to claim 2, wherein the material of the light reflecting unit is a nanoscale light reflecting material.
4. The organic light emitting diode device of claim 2, wherein the light reflecting layer comprises a substrate and a groove hole on the substrate, and the light reflecting unit is disposed in the groove hole.
5. The OLED device as claimed in claim 2, wherein the shape and size of the pixel unit are matched with those of the light-reflecting unit.
6. The organic light emitting diode device according to claim 2, wherein the pixel unit is in an elliptical sphere shape, and the light reflecting unit is provided with a concave mirror structure on a side facing the pixel unit.
7. The organic light-emitting diode device according to claim 6, wherein a focal point of the concave mirror structure coincides with a center point position of the pixel unit disposed corresponding thereto.
8. The organic light emitting diode device according to claim 2, wherein the pixel cells include a red pixel cell, a green pixel cell, and a blue pixel cell;
the light reflecting layer is provided with a first light reflecting unit, a second light reflecting unit and a third light reflecting unit which respectively correspond to the red pixel unit, the green pixel unit and the blue pixel unit.
9. The organic light-emitting diode device according to claim 1, further comprising:
a hole transport layer disposed between the anode layer and the light reflective layer; and
and an electron transport layer disposed between the light emitting layer and the cathode layer.
10. A display device comprising the organic light-emitting diode device according to any one of claims 1 to 9.
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| CN202010311413.7A CN111415966A (en) | 2020-04-20 | 2020-04-20 | Organic light emitting diode device and display device |
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| CN202010311413.7A CN111415966A (en) | 2020-04-20 | 2020-04-20 | Organic light emitting diode device and display device |
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