CN109728178B - Organic electroluminescent element, array substrate, preparation method of array substrate and display panel - Google Patents
Organic electroluminescent element, array substrate, preparation method of array substrate and display panel Download PDFInfo
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Abstract
The invention provides an organic electroluminescent element, an array substrate, a preparation method of the array substrate and a display panel. The organic electroluminescence element comprises a first electrode, a light-emitting functional layer and a second electrode, wherein the light-emitting functional layer is clamped between the first electrode and the second electrode, and the light-emitting functional layer is of a curved plate structure. Compared with the organic electroluminescent element with the planar plate structure light-emitting function layer with the same large light-emitting area, the organic electroluminescent element can enlarge the light-emitting area of the organic electroluminescent element, so that the voltage loaded by the organic electroluminescent element with the curved plate structure light-emitting function layer is obviously lower than the voltage loaded by the organic electroluminescent element with the planar plate structure light-emitting function layer under the condition that the light-emitting brightness of the organic electroluminescent element is not changed, the heat radiation of the organic electroluminescent element is further reduced, the exciton quenching phenomenon caused by high temperature is improved, the aging rate of excitons is slowed down, and the service life of the organic electroluminescent element is finally prolonged.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic electroluminescent element, an array substrate, a preparation method of the array substrate and a display panel.
Background
OLED (Organic Light-Emitting Diode) display panels are increasingly applied to intelligent display terminals due to their advantages of high contrast, wide color gamut, fast response speed, flexibility, and the like, and become the next generation display technology.
The OLED display panel generally includes RGB (red, green, blue) three-color light emitting elements, and in the case where an equal amount of voltage is supplied, heat radiation of the blue light emitting element is high, and an exciton quenching phenomenon of the blue light emitting element when it is lit is severe, resulting in a short lifetime of the blue light emitting element, and thus, the OLED display panel has a short lifetime.
Disclosure of Invention
The invention provides an organic electroluminescent element, an array substrate, a preparation method of the array substrate and a display panel, aiming at the technical problems in the prior art. Compared with the organic electroluminescent element with the planar plate structure light-emitting function layer with the same large light-emitting area, the organic electroluminescent element can enlarge the light-emitting area of the organic electroluminescent element, so that the voltage loaded by the organic electroluminescent element with the curved plate structure light-emitting function layer is obviously lower than the voltage loaded by the organic electroluminescent element with the planar plate structure light-emitting function layer under the condition that the light-emitting brightness of the organic electroluminescent element is not changed, the heat radiation of the organic electroluminescent element is further reduced, the exciton quenching phenomenon caused by high temperature is improved, the aging rate of excitons is slowed down, and the service life of the organic electroluminescent element is finally prolonged.
The invention provides an organic electroluminescent element which comprises a first electrode, a luminous functional layer and a second electrode, wherein the luminous functional layer is clamped between the first electrode and the second electrode, and the luminous functional layer is of a curved plate structure.
Preferably, the light-emitting functional layer is an arc panel, the arc panel is recessed towards the side where the first electrode is located, and the first electrode and the second electrode are both arc panels matched with the light-emitting functional layer.
Preferably, the light-emitting functional layer is an arc panel, the arc panel is recessed towards the side where the second electrode is located, and the first electrode and the second electrode are both arc panels matched with the light-emitting functional layer.
Preferably, the light-emitting functional layer is a wave plate, the wave plate has the same shape and size of the wave crest and the wave trough, and the first electrode and the second electrode are both the wave plates matched with the light-emitting functional layer.
The invention also provides an array substrate, which comprises a substrate and organic electroluminescent elements with different colors arranged on the substrate, wherein the organic electroluminescent elements are arranged in an array manner, and the organic electroluminescent elements with at least the first color are the organic electroluminescent elements;
the organic electroluminescent element with the first color is the organic electroluminescent element, under the condition that the brightness of light emitted from the same light emitting surface is not changed, the reduction amplitude of the loading voltage of the organic electroluminescent element with the first color is larger than a preset value compared with the loading voltage of the organic electroluminescent element with the light emitting functional layer with the planar plate structure with the same color.
Preferably, the organic electroluminescent elements of different colors include red, green and blue organic electroluminescent elements;
the organic electroluminescent element of the first color is a blue organic electroluminescent element, and the light-emitting functional layers of the red and green organic electroluminescent elements are of a planar plate structure.
Preferably, the substrate is further provided with a resin layer, the organic electroluminescent element is arranged on the resin layer, and the surface of the resin layer, which is in contact with the organic electroluminescent element, is matched with the shape of the organic electroluminescent element.
Preferably, the array substrate is a top emission type or a bottom emission type array substrate.
The invention also provides a display panel comprising the array substrate.
The invention also provides a preparation method of the array substrate, which comprises the step of preparing and forming organic electroluminescent elements with different colors on the substrate.
Preferably, the preparation method comprises the steps of preparing and forming a resin layer on the substrate by adopting a nano-imprinting method or a half-tone mask method;
and then preparing and forming the organic electroluminescent element by adopting an evaporation method or a solution method.
The invention has the beneficial effects that: the organic electroluminescent element provided by the invention has the advantages that the light emitting function layer of the organic electroluminescent element is set to be of the curved plate structure, and compared with the organic electroluminescent element with the light emitting function layer of the flat plate structure with the same large light emitting area, the light emitting area of the organic electroluminescent element can be enlarged, so that the voltage loaded by the organic electroluminescent element with the light emitting function layer of the curved plate structure is obviously lower than the voltage loaded by the organic electroluminescent element with the light emitting function layer of the flat plate structure under the condition that the light emitting brightness of the organic electroluminescent element is not changed, the heat radiation of the organic electroluminescent element is further reduced, the exciton quenching phenomenon caused by high temperature is improved, the aging rate of excitons is slowed, and the service life of the organic electroluminescent element is finally prolonged.
According to the array substrate provided by the invention, the organic electroluminescent element with the first color and at least with shorter service life adopts the organic electroluminescent element, so that the loading voltage of the organic electroluminescent element with the first color can be at least reduced, the heat radiation of the organic electroluminescent element with the first color can be at least reduced, the exciton quenching phenomenon of the organic electroluminescent element with the first color caused by higher temperature can be improved, the exciton aging rate of the organic electroluminescent element with the first color can be reduced, the service life of the organic electroluminescent element with the first color can be further improved, and the service life of the array substrate can be finally improved under the condition that the light-emitting brightness of the array substrate is ensured to be unchanged.
The display panel provided by the invention can improve the service life of the display panel under the condition of ensuring that the display brightness of the display panel is not changed by adopting the array substrate.
Drawings
FIG. 1 is a schematic cross-sectional view illustrating a conventional OLED display panel;
FIG. 2 is a schematic sectional view showing the structure of an organic electroluminescent element in example 1 of the present invention;
FIG. 3 is a schematic cross-sectional view of a light-emitting functional layer having a curved plate structure with a larger light-emitting area than a light-emitting functional layer having a flat plate structure;
FIG. 4 is a schematic sectional view showing the structure of an organic electroluminescent element in example 2 of the present invention;
FIG. 5 is a schematic sectional view showing the structure of an organic electroluminescent element in example 3 of the present invention;
fig. 6 is a schematic cross-sectional view of a structure of a top-emission type array substrate in embodiment 4 of the present invention;
fig. 7 is a schematic cross-sectional view of a bottom emission type array substrate in embodiment 4 of the present invention.
Wherein the reference numbers indicate:
1. a first electrode; 2. a light-emitting functional layer; 3. a second electrode; 4. a substrate; 5. an organic electroluminescent element of a first color; 6. a resin layer; 7. a pixel defining layer; 8. an anode; 9. a cathode; 10. a blue light emitting element; 11. a light-emitting surface of the organic electroluminescent element; 12. and a pixel circuit layer.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes an organic electroluminescent element, an array substrate, a method for manufacturing the same, and a display panel provided by the present invention in further detail with reference to the accompanying drawings and the detailed description.
In the conventional OLED display panel, as shown in fig. 1, a pixel circuit layer 12 is provided on a substrate 4, a pixel defining layer 7 is provided on the pixel circuit layer 12, the pixel defining layer 7 is intersected in a longitudinal direction to define a plurality of pixel regions, and three-color RGB (red, green, and blue) light emitting elements are provided in each of the pixel regions. The anode 8, the light-emitting functional layer 2 and the cathode 9 of the RGB three-color light-emitting element are all of a flat plate structure. In the case where the same amount of voltage is supplied to the RGB three-color light emitting elements, the heat radiation of the blue light emitting element 10 is high, and the exciton quenching phenomenon of the blue light emitting element 10 at the time of lighting is severe, resulting in a short lifetime of the blue light emitting element 10, and thus a short lifetime of the OLED display panel.
Example 1:
the present embodiment provides an organic electroluminescent device, as shown in fig. 2, including a first electrode 1, a light-emitting functional layer 2 and a second electrode 3, where the light-emitting functional layer 2 is sandwiched between the first electrode 1 and the second electrode 3, and the light-emitting functional layer 2 is a curved plate structure.
The light-emitting functional layer 2 includes a hole transport layer, a hole injection layer, a light-emitting layer, an electron transport layer, and an electron injection layer. Each film layer forming the luminous functional layer 2 is a curved plate structure, and the curved plate structures of the film layers are matched, so that the luminous functional layer 2 of the curved plate structure is formed. Alternatively, the light-emitting functional layer 2 may include only a light-emitting layer. The first electrode 1 is an anode of the organic electroluminescent element, and the second electrode 3 is a cathode of the organic electroluminescent element.
In this embodiment, preferably, the light-emitting functional layer 2 is an arc panel, the arc panel is recessed toward the side where the first electrode 1 is located, and both the first electrode 1 and the second electrode 3 are arc panels matched with the light-emitting functional layer 2.
Note that the first electrode 1 and the second electrode 3 may be formed only on the surfaces in contact with the light-emitting function layer 2 so as to match the shape of the light-emitting function layer 2.
As shown in fig. 3, the light emitting surface 11 provided with the organic electroluminescent device is a plane, and when the forward projection areas on the light emitting surface 11 are equal (i.e. when the light emitting areas are equal), the light emitting area of the light emitting functional layer 2 with the curved plate structure is significantly higher than the light emitting area of the light emitting functional layer 2 with the planar plate structure.
The luminous function layer 2 of the organic electroluminescent element is arranged to be of a curved plate structure, and compared with the organic electroluminescent element with the luminous function layer of a flat plate structure with the same large light-emitting area, the luminous area of the organic electroluminescent element can be enlarged, so that the voltage loaded by the organic electroluminescent element with the luminous function layer 2 of the curved plate structure is obviously lower than the voltage loaded by the organic electroluminescent element with the luminous function layer of the flat plate structure under the condition that the luminous brightness of the organic electroluminescent element is not changed, the heat radiation of the organic electroluminescent element is further reduced, the exciton quenching phenomenon caused by high temperature is improved, the exciton aging rate is slowed, and the service life of the organic electroluminescent element is finally prolonged.
Example 2:
the present embodiment provides an organic electroluminescent device, which is different from embodiment 1 in that, as shown in fig. 4, the light-emitting functional layer 2 is an arc panel, the arc panel is recessed toward the side where the second electrode 3 is located, and both the first electrode 1 and the second electrode 3 are arc panels matched with the light-emitting functional layer 2.
The other structural arrangements and the principles of improving the lifetime of the organic electroluminescent element in this embodiment are the same as those in embodiment 1, and are not described herein again.
Example 3:
this embodiment provides an organic electroluminescent device, which is different from embodiments 1-2 in that, as shown in fig. 5, the luminescent functional layer 2 is a corrugated plate, the shape and size of the wave crest and the wave trough of the corrugated plate are the same, and the first electrode 1 and the second electrode 3 are both corrugated plates matched with the luminescent functional layer 2.
It should be noted that the wave crest and the wave trough of the wave plate can be the same in shape and different in size.
The other structural arrangements and the principles of improving the lifetime of the organic electroluminescent element in this embodiment are the same as those in embodiment 1, and are not described herein again.
Beneficial effects of examples 1-3: in the organic electroluminescent device provided in embodiments 1 to 3, the light emitting functional layer of the organic electroluminescent device is configured as a curved plate structure, and compared with the organic electroluminescent device having a light emitting functional layer with a flat plate structure with the same large light emitting area, the light emitting area of the organic electroluminescent device can be enlarged, so that under the condition that the light emitting luminance of the organic electroluminescent device is not changed, the voltage applied to the organic electroluminescent device having the light emitting functional layer with the curved plate structure is significantly lower than the voltage applied to the organic electroluminescent device having the light emitting functional layer with the flat plate structure, thereby reducing the heat radiation of the organic electroluminescent device, improving the exciton quenching phenomenon caused by a high temperature, slowing down the aging rate of excitons, and finally improving the lifetime of the organic electroluminescent device.
Example 4:
the present embodiment provides an array substrate, as shown in fig. 6, including a substrate 4 and organic electroluminescent elements of different colors disposed on the substrate 4, where the organic electroluminescent elements are arranged in an array, and at least the organic electroluminescent element 5 of the first color is the organic electroluminescent element in any one of embodiments 1 to 3; the organic electroluminescent element 5 of the first color is an organic electroluminescent element in which the magnitude of the load voltage drop of the organic electroluminescent element 5 of the first color is greater than a predetermined value compared with the load voltage drop of the organic electroluminescent element of the light-emitting functional layer of the planar plate structure of the same color under the condition that the brightness of the emitted light on the same light-emitting surface is not changed.
In this embodiment, the organic electroluminescent element 5 of the first color is the organic electroluminescent element in embodiment 1.
The substrate 4 is provided with pixel defining layers 7 which are criss-cross, the pixel defining layers 7 define a plurality of pixel regions, and organic electroluminescent elements with different colors are respectively arranged in each pixel region. The applied voltage is applied when the organic electroluminescent element emits light. The predetermined value range is: 2.5V-10V. The predetermined value range indicates that the organic electroluminescent element 5 of the first color is an organic electroluminescent element of a certain color that easily causes higher heat radiation at the same applied voltage in the array substrate, i.e., an organic electroluminescent element that has the shortest lifetime at the same applied voltage.
By using the organic electroluminescent element 5 of the first color having at least a shorter lifetime as the organic electroluminescent element in any one of embodiments 1 to 3, it is possible to reduce the applied voltage of the organic electroluminescent element 5 of the first color, thereby reducing the heat radiation of the organic electroluminescent element 5 of the first color, improving the exciton quenching phenomenon of the organic electroluminescent element 5 of the first color due to a higher temperature, slowing down the exciton aging rate of the organic electroluminescent element 5 of the first color, further improving the lifetime of the organic electroluminescent element 5 of the first color having a shorter lifetime, and finally improving the lifetime of the array substrate.
In this embodiment, the organic electroluminescent elements of different colors include red, green, and blue organic electroluminescent elements; the organic electroluminescent element 5 of the first color is a blue organic electroluminescent element, and the light emitting functional layers of the red and green organic electroluminescent elements are of a planar plate structure. Compared with red and green organic electroluminescent elements, the blue organic electroluminescent element is easier to cause higher heat radiation under the same loading voltage, and is easier to generate exciton quenching phenomenon under the action of higher heat radiation, namely, the aging rate of excitons of the blue organic electroluminescent element is higher, and the service life of the blue organic electroluminescent element is shorter, so that the service life of the blue organic electroluminescent element can be well improved as long as the light-emitting functional layer 2 of the blue organic electroluminescent element in the array substrate is set to be of a curved plate structure, and the service life of the array substrate is effectively improved.
In this embodiment, the substrate 4 is further provided with a resin layer 6, the organic electroluminescent element is provided on the resin layer 6, and the surface of the resin layer 6 in contact with the organic electroluminescent element is matched with the shape of the organic electroluminescent element. The shape of the resin layer 6 is set to be beneficial to preparing the organic electroluminescent element with the luminous functional layer 2 of a curved plate structure on the resin layer 6.
In this embodiment, the array substrate is a top emission type array substrate. The first electrode 1 of the organic electroluminescent element is closer to the substrate 4 than the second electrode 3, and the first electrode 1 is made of a light-tight material, so that a top emission type array substrate is realized.
It should be noted that the array substrate may also be a bottom emission type array substrate, as shown in fig. 7, the second electrode 3 of the organic electroluminescent element, which is far from the substrate 4 relative to the first electrode 1, is made of a light-impermeable material, so as to implement a bottom emission type array substrate.
In addition, the organic electroluminescent element structure in any one of embodiments 1 to 3 can be used for both the red and green organic electroluminescent elements in the array substrate, so that the lifetime of the red and green organic electroluminescent elements can be further improved, and the lifetime of the array substrate can be further improved.
In this embodiment, a pixel circuit layer 12 is further disposed on the substrate 4 on a side of the resin layer 6 away from the organic electroluminescent element, the pixel circuit layer 12 includes a TFT circuit and pixel driving circuits such as gate lines and data lines, and the pixel circuit layers are all in the existing arrangement, and details are not repeated.
Based on the above structure of the array substrate, this embodiment also provides a method for manufacturing the array substrate, which includes forming organic electroluminescent elements of different colors on the substrate.
The preparation method of the array substrate specifically comprises the steps of preparing and forming a resin layer on the substrate by adopting a nano-imprinting method or a half-tone mask method; then, an organic electroluminescent element is formed by an evaporation method or a solution method.
The resin layer is made of resin materials, the resin layer with the surface matched with the shape of the organic electroluminescent element can be directly formed by pressing through a nano-imprinting method, and the nano-imprinting method is a mature preparation process and is not repeated. The halftone mask method is a relatively mature preparation process and is not described herein any more, by performing halftone exposure on a resin layer base film formed by coating with a halftone mask plate, and preparing a resin layer having a surface matching the shape of the organic electroluminescent element by exposure and subsequent development processes.
The preparation and formation of the organic electroluminescent element by adopting the evaporation method or the solution method comprises the steps of preparing and forming the first electrode, the light-emitting functional layer and the second electrode in sequence by adopting the evaporation method or the solution method, and the evaporation method and the solution method are relatively mature preparation processes and are not repeated herein.
In addition, before the organic electroluminescent element is prepared and formed, a step of preparing and forming a pixel defining layer on the resin layer is also included, and the pixel defining layer is prepared and formed by adopting a relatively mature composition process, which is not described herein again.
Beneficial effects of example 4: the array substrate provided in embodiment 4, wherein the organic electroluminescent element of the first color with at least a shorter lifetime is the organic electroluminescent element in any one of embodiments 1 to 3, so that the loading voltage of the organic electroluminescent element of the first color can be at least reduced, the thermal radiation of the organic electroluminescent element of the first color can be at least reduced, the exciton quenching phenomenon of the organic electroluminescent element of the first color due to a higher temperature can be improved, the exciton aging rate of the organic electroluminescent element of the first color can be slowed down, the lifetime of the organic electroluminescent element of the first color can be further improved, and finally, the lifetime of the array substrate can be improved while the light emitting brightness of the array substrate is ensured to be unchanged.
Example 5:
the present embodiment provides a display panel including the array substrate in embodiment 4.
By adopting the array substrate in embodiment 4, the lifetime of the display panel can be improved while ensuring that the display brightness of the display panel is not changed.
The display panel provided by the invention can be any product or component with a display function, such as an OLED panel, an OLED television, a display, a mobile phone, a navigator and the like, and can also be a semi-finished product of the product or component with the display function.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. An array substrate comprises a substrate and organic electroluminescent elements with different colors arranged on the substrate, wherein the organic electroluminescent elements are arranged in an array manner, and the array substrate is characterized in that at least one organic electroluminescent element with a first color comprises a first electrode, a light-emitting functional layer and a second electrode, the light-emitting functional layer is clamped between the first electrode and the second electrode, and the light-emitting functional layer is of a curved plate structure;
the luminous functional layer is an arc panel, the arc panel is sunken towards the side where the first electrode is located, and the first electrode and the second electrode are arc panels matched with the luminous functional layer; or the luminous functional layer is an arc panel, the arc panel is sunken towards the side where the second electrode is located, and the first electrode and the second electrode are arc panels matched with the luminous functional layer;
or, the light-emitting functional layer is a wave plate, the wave plate has the same shape and size of wave crest and wave trough, and the first electrode and the second electrode are both the wave plates matched with the light-emitting functional layer;
the organic electroluminescent element with the first color is an organic electroluminescent element, under the condition that the brightness of light emitted from the same light emitting surface is not changed, the reduction of the loading voltage of the organic electroluminescent element with the first color is larger than a preset value relative to the loading voltage of the organic electroluminescent element with the light emitting functional layer with the same color and the planar plate structure;
the organic electroluminescent elements of different colors include red, green and blue organic electroluminescent elements;
the organic electroluminescent element of the first color is a blue organic electroluminescent element, and the light-emitting functional layers of the red and green organic electroluminescent elements are of a planar plate structure.
2. The array substrate of claim 1, wherein a resin layer is further disposed on the substrate, the organic electroluminescent element is disposed on the resin layer, and a surface of the resin layer in contact with the organic electroluminescent element matches a shape of the organic electroluminescent element.
3. The array substrate of claim 1, wherein the array substrate is a top-emission type or a bottom-emission type array substrate.
4. A display panel comprising the array substrate according to any one of claims 1 to 3.
5. A method for fabricating an array substrate according to any one of claims 1 to 3, comprising fabricating organic electroluminescent elements of different colors on the substrate.
6. The production method according to claim 5, wherein the array substrate is the array substrate according to claim 2, and the production method includes producing a resin layer on the substrate by a nano-imprint method or a half-tone mask method;
and then preparing and forming the organic electroluminescent element by adopting an evaporation method or a solution method.
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| CN102931360A (en) * | 2012-10-25 | 2013-02-13 | 四川虹视显示技术有限公司 | Organic light emitting diode |
| CN103022048B (en) * | 2012-12-12 | 2016-08-17 | 京东方科技集团股份有限公司 | Array base palte and preparation method thereof, organic LED display device |
| CN104779269B (en) * | 2015-04-13 | 2017-06-27 | 深圳市华星光电技术有限公司 | Oled display device |
| KR101802778B1 (en) * | 2015-10-30 | 2017-11-30 | 엘지디스플레이 주식회사 | Organic light emitting display device |
| CN105226080B (en) * | 2015-11-18 | 2018-09-25 | 上海天马有机发光显示技术有限公司 | A kind of display device and its manufacturing method |
| CN106299143B (en) * | 2016-09-05 | 2019-03-08 | 京东方科技集团股份有限公司 | A kind of collimated light source, its production method and display device |
| KR102661816B1 (en) * | 2016-12-20 | 2024-04-29 | 엘지디스플레이 주식회사 | Organic Light Emitting Diode And Device Including The Same |
| CN108511612B (en) * | 2017-02-27 | 2020-06-16 | 乐金显示有限公司 | Organic light emitting device |
| CN107403811A (en) * | 2017-09-07 | 2017-11-28 | 京东方科技集团股份有限公司 | Display base plate and its manufacture method and display device |
| CN107819079A (en) * | 2017-10-18 | 2018-03-20 | 武汉华星光电半导体显示技术有限公司 | Organic electroluminescence display panel and its manufacture method, organic light-emitting display device |
| CN107799662A (en) * | 2017-12-05 | 2018-03-13 | 京东方科技集团股份有限公司 | Organic light emitting diode device and preparation method thereof, display panel, display device |
| CN108364989B (en) * | 2018-02-26 | 2021-01-05 | 上海天马有机发光显示技术有限公司 | Organic light-emitting display panel, preparation method thereof and organic light-emitting display device |
| CN108538896A (en) * | 2018-04-26 | 2018-09-14 | 武汉华星光电半导体显示技术有限公司 | Oled pixel structure and oled display panel |
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