Display panel, manufacturing method thereof and display device

Abstract

The application discloses a display panel and a manufacturing method thereof, and a display device. The display panel comprises a first substrate, a plurality of electroluminescent units located on one side of the first substrate, each of the electroluminescent units emitting light of a first color, a light-transmitting encapsulation layer located on a side of the electroluminescent units away from the first substrate, a plurality of electrophotoluminescent units distributed at intervals, and a plurality of organic material layers. A vertical projection of the electrophotoluminescent unit on the first substrate and a vertical projection of the organic material layer on the first substrate overlap. A vertical projection of an organic material layer on the first substrate is included between vertical projections of two adjacent electrophotoluminescent units on the first substrate. The electrophotoluminescent unit emits light of a second color under excitation of light of the first color and a first voltage, and emits light of a third color under excitation of light of the first color and a second voltage. The application can improve the resolution of the display panel.

Description

TECHNICAL FIELD

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

[0002] With the development of information technology, display panel as an information display carrier is becoming more and more important. At present, mainstream display technology usually adopts RGB three primary color sub-pixel combination mode to realize multi-color function, that is, each pixel is composed of three or more sub-pixels, and each sub-pixel can only display a single color in the plane interval. Through different combinations of sub-pixels and color changes, single color or multi-color display function is achieved.

[0003] However, due to the planar arrangement of sub-pixels in the display panel and the occupation of independent space by each sub-pixel, the filling rate of the pixel is not high when displaying information, which limits the improvement of the resolution of the display panel. SUMMARY

[0004] The present application provides a display panel, a manufacturing method thereof and a display device, which can improve the resolution of the display panel.

[0005] According to an aspect of the present application, a display panel is provided, which comprises:

[0006] a first substrate;

[0007] a plurality of electroluminescent units located on one side of the first substrate, each of the electroluminescent units emits light of a first color, each of the electroluminescent units comprises an organic material layer, and a plurality of the organic material layers are distributed at intervals;

[0008] a light-transmitting encapsulation layer located on a side of the electroluminescent units away from the first substrate;

[0009] a plurality of electrophotoluminescent units distributed at intervals located on a side of the light-transmitting encapsulation layer away from the first substrate; the vertical projection of the electrophotoluminescent unit on the first substrate overlaps with the vertical projection of the organic material layer on the first substrate; the vertical projection of the electrophotoluminescent unit on the first substrate includes the vertical projection of the organic material layer on the first substrate between the vertical projections of two adjacent electrophotoluminescent units on the first substrate; the electrophotoluminescent unit emits light of a second color under excitation of light of the first color and a first voltage, and emits light of a third color under excitation of light of the first color and a second voltage; the first color, the second color and the third color are different from each other.

[0010] Optionally, the electrophotoluminescent unit comprises a first transparent conductive layer, an electrophotoluminescent layer and a second transparent conductive layer.

[0011] The first transparent conductive layer is located on a side of the light-transmitting encapsulation layer away from the first substrate.

[0012] The electrochromic layer is located on a side of the first transparent conductive layer away from the first substrate.

[0013] The second transparent conductive layer is located on a side of the electrochromic layer away from the first substrate.

[0014] Optionally, the material of the electrochromic layer comprises a first material, a second material, a third material and a fourth material.

[0015] The first material is 1-(4-(dimethylamino)phenyl) 3-(p-tolyl) urea; the second material is 3', 6'-bis(diethylamino)-3-oxopyrano[isoindol-1, 9'-xanthene]-2-acetate; the third material is p-benzoquinone; and the fourth material is fluorescein.

[0016] Optionally, the molar ratio of the first material, the second material, the third material and the fourth material is 2:2:2:1.

[0017] Optionally, the first color is blue; the second color is red; and the third color is green.

[0018] Optionally, the first voltage ranges from 0.5V to 1.2V.

[0019] The second voltage ranges from -1.2V to -0.5V.

[0020] Optionally, the electroluminescent unit further comprises a first electrode and a second electrode.

[0021] The first electrode is located on a side of the first substrate.

[0022] The organic material layer is located on a side of the first electrode away from the first substrate.

[0023] The second electrode is located on a side of the organic material layer away from the first substrate.

[0024] The second electrode in each of the electroluminescent units is integrally connected.

[0025] Optionally, the display panel further comprises a second substrate.

[0026] The second substrate is located on a side of the electrochromic electroluminescent unit away from the first substrate; and the second substrate has light-transmitting property.

[0027] According to another aspect of the present application, a manufacturing method of a display panel is provided, which comprises:

[0028] providing a first substrate;

[0029] forming a plurality of electroluminescent units, wherein the plurality of electroluminescent units are located on one side of the first substrate, each of the electroluminescent units emits light of a first color, each of the electroluminescent units comprises an organic material layer, and the plurality of organic material layers are distributed at intervals;

[0030] forming a light-transmitting encapsulation layer, wherein the light-transmitting encapsulation layer is located on a side of the electroluminescent units away from the first substrate;

[0031] forming a plurality of electrophotoluminescent units distributed at intervals, wherein the plurality of electrophotoluminescent units are located on a side of the light-transmitting encapsulation layer away from the first substrate, a vertical projection of the electrophotoluminescent units on the first substrate overlaps a vertical projection of the organic material layer on the first substrate, a vertical projection of two adjacent electrophotoluminescent units on the first substrate comprises a vertical projection of one organic material layer on the first substrate, the electrophotoluminescent units emit light of a second color under excitation of light of the first color and under a first voltage, and emit light of a third color under excitation of light of the first color and under a second voltage, and the first color, the second color and the third color are different from each other.

[0032] According to another aspect of the present application, there is provided a display device comprising the display panel provided by any of the embodiments of the present application.

[0033] The display panel provided by the present embodiment comprises electrophotoluminescent units which can emit light of a second color under excitation of light of a first color emitted by photoluminescent units and under a first voltage, and can emit light of a third color under excitation of light of the first color emitted by the photoluminescent units and under a second voltage, wherein the first color, the second color and the third color are different from each other. One photoluminescent unit is arranged between two adjacent electrophotoluminescent units. The electrophotoluminescent unit between the two adjacent electrophotoluminescent units and the electrophotoluminescent unit under excitation of light of the first color can constitute one pixel. In summary, the pixel provided by the present embodiment comprises two sub-pixels, and the area of the two sub-pixels on the first substrate is less than the area of three sub-pixels on the first substrate. Therefore, the display panel provided by the present embodiment can have a higher resolution.

[0034] It should be understood that the content described in this section is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to make the technical solution in the embodiments of the present application clearer, the drawings needed in the embodiment description will be briefly introduced as follows. 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 any creative effort on the basis of these drawings.

[0036] Figure 1 is a structural schematic diagram of a display panel according to an embodiment of the present application;

[0037] Figure 2 is a structural schematic diagram of another display panel according to an embodiment of the present application;

[0038] Figure 3 is a structural schematic diagram of another display panel according to an embodiment of the present application;

[0039] Figure 4 is a flowchart of a manufacturing method of a display panel according to the embodiment. DETAILED DESCRIPTION

[0040] In order to make the technical solution in the embodiments of the present application clearer, the drawings needed in the embodiment description will be briefly introduced as follows. 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 any creative effort on the basis of these drawings.

[0041] It should be noted that the terms "first", "second", and the like in the description of the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] Figure 1 is a structural schematic diagram of a display panel according to an embodiment of the present application, referring to Figure 1The display panel provided in the embodiment comprises a first substrate 110, a plurality of electroluminescent units 120, a light-transmitting encapsulation layer 130, and a plurality of spaced electrophosphorescent units 140. The plurality of electroluminescent units 120 are located on one side of the first substrate 110, each of the electroluminescent units 120 emits light of a first color, and each of the electroluminescent units 120 comprises an organic material layer 121, and the plurality of organic material layers 121 are spaced. The light-transmitting encapsulation layer 130 is located on a side of the electroluminescent units 120 away from the first substrate 110. The plurality of electrophosphorescent units 140 are located on a side of the light-transmitting encapsulation layer 130 away from the first substrate 110. The vertical projection of the electrophosphorescent unit 140 on the first substrate 110 overlaps the vertical projection of the organic material layer 121 on the first substrate 110. The vertical projection of the electrophosphorescent unit 140 on the first substrate 110 between the vertical projections of two adjacent electrophosphorescent units 140 on the first substrate 110 comprises the vertical projection of an organic material layer 121 on the first substrate 110. The electrophosphorescent unit 140 emits light of a second color under the excitation of light of the first color and a first voltage, and emits light of a third color under the excitation of light of the first color and a second voltage. The first color, the second color, and the third color are different from each other.

[0043] Specifically, each of the electroluminescent units 120 comprises an organic material layer 121. The organic material layer 121 comprises a hole layer, a light-emitting layer, and an electron layer. The display panel provided in the embodiment further comprises a pixel definition layer 150, and the pixel definition layer 150 is insulating. The pixel definition layer 150 is used to isolate two adjacent organic material layers 121 to prevent the carriers in the two adjacent organic material layers 121 from interacting.

[0044] The light-transmitting encapsulation layer 130 is light-transmitting, and the material of the light-transmitting encapsulation layer 130 can comprise resin or glass, etc. The light-transmitting encapsulation layer 130 is used to protect the electroluminescent units 120 from being polluted by external water vapor, dust, etc. The vertical projection of the light-transmitting encapsulation layer 130 on the first substrate 110 covers the vertical projection of each of the electroluminescent units 120 on the first substrate 110.

[0045] The electroluminescent unit 120 emits light of a first color under the action of an applied voltage. The light of the first color can be blue light. Under the excitation of the light of the first color, the electrophosphorescent unit 140 emits light of a second color when receiving a first voltage, and the second color can be red, and emits light of a third color when receiving a second voltage, and the third color can be green. Under the excitation of the light of the first color, the color of the light emitted by the electrophosphorescent unit 140 can be switched by changing the voltage on the electrophosphorescent unit 140.

[0046] The vertical projection of the electroluminescent unit 120 on the first substrate 110 can be overlapped with the vertical projection of the organic material layer 121 on the first substrate 110, which can make the light emitted by the organic material layer 121 be received by the electroluminescent unit 120, thereby improving the light emitting efficiency of the electroluminescent unit 120. There is a gap between two adjacent electroluminescent units 120, and the size of the gap can be the size of the area of the vertical projection of one electroluminescent unit 120 on the first substrate 110.

[0047] With reference to the foregoing description of the display panel, Figure 1 The display panel provided in the embodiment can regard two adjacent first sub-pixels and second sub-pixels as one pixel 160, the first sub-pixel includes the electroluminescent unit 120 and the electroluminescent unit 140, and the vertical projection of the electroluminescent unit 140 on the first substrate 110 is overlapped with the vertical projection of the organic material layer 121 on the first substrate 110. The second sub-pixel includes the electroluminescent unit 120, and does not include the electroluminescent unit 140. The pixel 160 in the embodiment can emit light of only the first color, light of only the second color, light of only the third color, light of the mixture of the first color and the second color, or light of the mixture of the first color and the third color. In summary, the pixel 160 in the display panel provided in the embodiment can emit light of multiple different colors, and one pixel 160 includes two sub-pixels. Compared with the pixel including three sub-pixels in the prior art, the number of sub-pixels in the pixel 160 provided in the embodiment is smaller, and the area of the pixel 160 on the first substrate 110 is smaller. It can be seen that the display panel provided in the embodiment can include a large number of pixels 160, thereby improving the resolution of the display panel.

[0048] The display panel provided in the embodiment includes the electroluminescent unit 140, which can emit light of the second color under the excitation of the light emitted by the electroluminescent unit 120 and the action of the first voltage, and can emit light of the third color under the excitation of the light emitted by the electroluminescent unit 120 and the action of the second voltage, wherein the first color, the second color and the third color are different from each other. One electroluminescent unit 120 is arranged between two adjacent electroluminescent units 140. The electroluminescent unit between the two adjacent electroluminescent units 140 and the electroluminescent unit 140 under the excitation of the light of the first color can constitute one pixel. In summary, the pixel provided in the embodiment includes two sub-pixels, and the area of the two sub-pixels on the first substrate is smaller than the area of three sub-pixels on the first substrate. Therefore, the display panel provided in the embodiment can have a higher resolution.

[0049] Optionally, Figure 2is a structural schematic diagram of yet another display panel provided according to an embodiment of the present application, referring to Figure 2 The electrophotoluminescent unit 140 comprises a first transparent conductive layer 141, an electrophotoluminescent layer 142, and a second transparent conductive layer 143. The first transparent conductive layer 141 is located on the side of the light-transmitting encapsulation layer 130 away from the first substrate 110. The electrophotoluminescent layer 142 is located on the side of the first transparent conductive layer 141 away from the first substrate 110. The second transparent conductive layer 143 is located on the side of the electrophotoluminescent layer 142 away from the first substrate 110.

[0050] Specifically, the first transparent conductive layer 141, the electrophotoluminescent layer 142, and the second transparent conductive layer 143 are sequentially stacked. The first transparent conductive layer 141 and the second transparent conductive layer 143 both have conductivity and light-transmitting property. Under the excitation of light of the first color, the electrophotoluminescent layer 142 emits light of the second color when the voltage difference between the first transparent conductive layer 141 and the second transparent conductive layer 143 is the first voltage, and emits light of the third color when the voltage difference between the first transparent conductive layer 141 and the second transparent conductive layer 143 is the second voltage. Therefore, under the excitation of light of the first color, the light-emitting color of the electrophotoluminescent layer 142 can be changed by changing the voltage difference between the first transparent conductive layer 141 and the second transparent conductive layer 143.

[0051] Optionally, the material of the electrophotoluminescent layer comprises a first material, a second material, a third material, and a fourth material. The first material is 1-(4-(dimethylamino)phenyl) 3-(p-tolyl) urea. The second material is 3', 6'-bis(diethylamino)-3-oxopyrano[isoindol-1, 9'-xanthene]-2-acetate. The third material is p-benzoquinone. The fourth material is fluorescein.

[0052] Specifically, the electrophotoluminescent layer comprising the first material, the second material, the third material, and the fourth material can emit light of two colors under the excitation of light of the first color and the action of voltage.

[0053] Optionally, the molar ratio of the first material, the second material, the third material, and the fourth material is 2:2:2:1.

[0054] Specifically, the first material, the second material, the third material, and the fourth material can be mixed and dissolved in an acetonitrile solution in a ratio of 2:2:2:1 to prepare the electrophotoluminescent layer provided in the embodiment.

[0055] Optionally, the first color is blue, the second color is red, and the third color is green.

[0056] Specifically, setting the first color, the second color, and the third color as blue, red, and green respectively can make the display panel emit light of multiple different colors.

[0057] Optionally, the first voltage ranges from 0.5V to 1.2V, and the second voltage ranges from -1.2V to -0.5V.

[0058] Specifically, under the excitation of the light of the first color, the electroluminescent unit emits the light of the second color with a higher purity when the first voltage is any voltage value in the range from 0.5V to 1.2V. Under the excitation of the light of the first color, the electroluminescent unit emits the light of the third color with a higher purity when the second voltage is any voltage value in the range from -1.2V to -0.5V. In addition, the voltage values of the first voltage and the second voltage are small, and thus the pixel in the display panel provided in the embodiment can work at a lower voltage, so that the display panel has a lower power consumption.

[0059] Optionally, continuing to refer to Figure 2 The electroluminescent unit 120 further includes a first electrode 122 and a second electrode 123. The first electrode 122 is located on one side of the first substrate 110. The organic material layer 121 is located on a side of the first electrode 122 away from the first substrate 110. The second electrode 123 is located on a side of the organic material layer 121 away from the first substrate 110. The second electrodes 123 in each electroluminescent unit 120 are integrally connected.

[0060] Specifically, the first electrode 122 can be an anode, and the second electrode 123 can be a cathode. The second electrode 123 has a light-transmitting property, so that the light of the first color emitted by the organic material layer 121 is transmitted into the electroluminescent unit 140. A pixel definition layer 150 is arranged between two adjacent first electrodes 122, and the pixel definition layer 150 can prevent the two adjacent first electrodes 122 from being electrically connected. When the first electrode 122 is an anode and the second electrode 123 is a cathode, the material of the first electrode 122 can be ITO and / or IZO, and the material of the second electrode 123 can be a magnesium-silver alloy.

[0061] Optionally, Figure 3 is a structural schematic diagram of still another display panel provided in an embodiment of the present application, and referring to Figure 3 The display panel provided in the embodiment further includes a second substrate 170. The second substrate 170 is located on a side of the electroluminescent unit 140 away from the first substrate 110. The second substrate 170 has a light-transmitting property.

[0062] Specifically, the vertical projection of the second substrate 170 on the first substrate 110 covers the vertical projection of all the electroluminescent units 140 on the first substrate 110. The light of the first color, the light of the second color, and the light of the third color can all be emitted through the second substrate 170.

[0063] Figure 4is a flowchart of a manufacturing method of a display panel according to the embodiment, referring to Figure 4 The manufacturing method of the display panel provided in the embodiment includes the following steps.

[0064] S110, providing a first substrate.

[0065] S120, forming a plurality of electroluminescent units, wherein the plurality of electroluminescent units are located on one side of the first substrate, each electroluminescent unit emits light of a first color, each electroluminescent unit includes an organic material layer, and the plurality of organic material layers are distributed at intervals.

[0066] S130, forming a light-transmitting encapsulation layer, wherein the light-transmitting encapsulation layer is located on the side of the electroluminescent units away from the first substrate.

[0067] S140, forming a plurality of spaced electrophotoluminescent units, wherein the plurality of electrophotoluminescent units are located on the side of the light-transmitting encapsulation layer away from the first substrate, the vertical projection of the electrophotoluminescent unit on the first substrate overlaps the vertical projection of the organic material layer on the first substrate, the vertical projection of the electrophotoluminescent unit on the first substrate includes the vertical projection of the organic material layer on the first substrate between the vertical projections of two adjacent electrophotoluminescent units on the first substrate, the electrophotoluminescent unit emits light of a second color under excitation of light of the first color and a first voltage, and emits light of a third color under excitation of light of the first color and a second voltage, and the first color, the second color and the third color are different from each other.

[0068] The manufacturing method of the display panel provided in the embodiment has corresponding beneficial effects of the display panel provided in any embodiment of the application, and the technical details are not described in detail in the embodiment. For details, see the display panel provided in any embodiment of the application.

[0069] The embodiment also provides a display device, which includes the display panel provided in any embodiment of the application.

[0070] Specifically, the display device provided in the embodiment can be a mobile phone, a tablet computer, a television, a notebook computer or the like, which is a product or component having a display function.

[0071] It should be understood that the various forms of flowcharts shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, and the present application does not limit this.

[0072] The above detailed description does not limit the scope of the application. Various modifications, combinations, sub-combinations and alternatives can be made to the detailed description. Any modification, equivalent replacement and improvement etc. made within the spirit and principle of the application shall be included in the scope of the application.

Claims

1. A display panel, characterized by, The application relates to an organic light-emitting device, which comprises the following parts: a first substrate; a plurality of electroluminescent units located on one side of the first substrate, each of the electroluminescent units emits light of a first color, each of the electroluminescent units comprises an organic material layer, and a plurality of the organic material layers are distributed at intervals; a light-transmitting encapsulation layer located on the side of the electroluminescent units away from the first substrate; a plurality of electrophotoluminescent units distributed at intervals on the side of the light-transmitting encapsulation layer away from the first substrate; the vertical projection of the electrophotoluminescent units on the first substrate overlaps with the vertical projection of the organic material layer on the first substrate; the vertical projection of two adjacent electrophotoluminescent units on the first substrate comprises the vertical projection of one organic material layer on the first substrate; the electrophotoluminescent units emit light of a second color under the excitation of light of the first color and a first voltage, and emit light of a third color under the excitation of light of the first color and a second voltage; the first color, the second color and the third color are different from each other.

2. The display panel of claim 1, wherein, The electrophotoluminescent unit comprises a first transparent conductive layer, an electrophotoluminescent layer and a second transparent conductive layer; The first transparent conductive layer is located on the side of the light-transmitting encapsulation layer away from the first substrate; The electrophotoluminescent layer is located on the side of the first transparent conductive layer away from the first substrate; The second transparent conductive layer is located on the side of the electrophotoluminescent layer away from the first substrate.

3. The display panel of claim 2, wherein, The material of the electrophotoluminescent layer comprises a first material, a second material, a third material and a fourth material; The first material is 1-(4-(dimethylamino)phenyl)3-(p-tolyl)urea; the second material is 3', 6'-bis(diethylamino)-3-oxopyran [isoindole-1, 9'-xanthene]-2-acetate; the third material is p-benzoquinone; and the fourth material is fluorescein.

4. The display panel of claim 3, wherein, The molar ratio of the first material, the second material, the third material and the fourth material is 2:2:2:

1.

5. The display panel of claim 1, wherein, The first color is blue; the second color is red; and the third color is green.

6. The display panel of claim 5, wherein, The first voltage ranges from 0.5V to 1.2V; The second voltage ranges from -1.2V to -0.5V.

7. The display panel of claim 5, wherein, The electroluminescent unit further comprises a first electrode and a second electrode; The first electrode is located on one side of the first substrate; The organic material layer is located on the side of the first electrode away from the first substrate; The second electrode is located on the side of the organic material layer away from the first substrate; The second electrode in each of the electroluminescent units is integrally connected.

8. The display panel of any of claims 1-7, wherein, The application further comprises a second substrate; The second substrate is located on the side of the electrophotoluminescent unit away from the first substrate; and the second substrate has light-transmitting property.

9. A manufacturing method of a display panel, comprising: The application relates to an organic light-emitting device, which comprises the following parts: providing a first substrate; forming a plurality of electroluminescent units, wherein the plurality of electroluminescent units are located on one side of the first substrate, each of the electroluminescent units emits light of a first color, each of the electroluminescent units comprises an organic material layer, and a plurality of the organic material layers are distributed at intervals; forming a light-transmissive encapsulation layer, wherein the light-transmissive encapsulation layer is located on a side of the electroluminescent unit away from the first substrate; forming a plurality of spaced-apart electroluminescent units, wherein the plurality of electroluminescent units are located on a side of the light-transmissive encapsulation layer away from the first substrate; a vertical projection of the electroluminescent unit on the first substrate and a vertical projection of the organic material layer on the first substrate overlap; a vertical projection of two adjacent electroluminescent units on the first substrate includes a vertical projection of the organic material layer on the first substrate; the electroluminescent unit emits a second color light under excitation of light of a first color and a first voltage, and emits a third color light under excitation of light of the first color and a second voltage; the first color, the second color and the third color are different from each other.

10. A display device, characterized by comprising: The display panel of any one of claims 1-8.

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