Light-emitting device, method for controlling light-emitting device, and display panel

Abstract

A light-emitting device, a method for controlling a light-emitting device, and a display panel proposed by the present invention. By providing a multi-color stacked light-emitting layer corresponding to the three primary colors, and providing a light-emitting electrode of a sub-electrode between different light-emitting organic layers, it is possible to adjust the voltage across the light-emitting organic layer by outputting a voltage to the sub-electrode, so as to control different light-emitting organic layers, thereby realizing multi-color display by a single light-emitting device. The effect of combining the original red, green, and blue devices is achieved by one light-emitting device. Therefore, the pixel density can be greatly improved. At the same time, since the stacked light-emitting layer is adopted, there is no charge cross-flow between different light-emitting layers, so that the light emission mixing between different colors can be avoided, and the light emission of a single color can be ensured.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a light-emitting device, a method for controlling a light-emitting device, and a display panel. Background Art

[0002] There are still many problems in the existing OLED manufacturing processes. The mainstream process methods include vacuum evaporation. In the prior art, due to the limitation of the FMM (Fine Metal Mask), it is difficult to achieve a high PPI (Pixels Per Inch) for the RGB pixels prepared by FMM vacuum evaporation, and there is a color mixing problem. Summary of the Invention

[0003] The main object of the present invention is to provide a light-emitting device, a method for controlling a light-emitting device, and a display panel, aiming to solve the problems that it is difficult to achieve a high PPI and there is color mixing in the existing OLED technology.

[0004] To achieve the above object, the present invention provides a light-emitting device, which includes:

[0005] A substrate;

[0006] A backplane circuit formed on the substrate;

[0007] A first electrode layer formed on the backplane circuit, wherein the first electrode layer includes three insulated sub-electrodes;

[0008] A multi-color stacked light-emitting layer formed on the first electrode layer, wherein the multi-color stacked light-emitting layer includes a plurality of light-emitting organic layers, the light-emitting organic layers respectively correspond to different primary colors, a light-extracting electrode is disposed between two adjacent light-emitting organic layers, and the light-extracting electrodes are respectively connected to the corresponding sub-electrodes;

[0009] A second electrode layer formed on the multi-color stacked light-emitting layer.

[0010] Optionally, a plurality of conductive terminals are disposed on the backplane circuit, and the conductive terminals include a first conductive terminal, a second conductive terminal, and a third conductive terminal; the light-emitting device further includes:

[0011] A planarization layer formed on the backplane circuit, wherein the planarization layer has an opening at the projection position of the conductive terminal;

[0012] The first electrode layer is formed on the planar layer. Among them, the sub-electrodes include a first sub-electrode, a second sub-electrode, and a third sub-electrode. The first sub-electrode is disposed at the projection position of the first conductive end, the second sub-electrode is disposed at the projection position of the second conductive end, and the third sub-electrode is disposed at the projection position of the third conductive end.

[0013] Optionally, the light-emitting electrode includes a first light-emitting electrode and a second light-emitting electrode, and the light-emitting organic layer includes a first light-emitting organic layer, a second light-emitting organic layer, and a third light-emitting organic layer; wherein:

[0014] The first light-emitting organic layer is formed on the first electrode layer;

[0015] The first light-emitting electrode is formed on the first light-emitting organic layer, and the first light-emitting electrode is connected to the second conductive end through the second sub-electrode;

[0016] The second light-emitting organic layer is formed on the first light-emitting electrode;

[0017] The second light-emitting electrode is formed on the second light-emitting organic layer, and the second light-emitting electrode is connected to the third conductive end through the third sub-electrode;

[0018] The third light-emitting organic layer is formed on the second light-emitting electrode.

[0019] Optionally, the light-emitting device further includes:

[0020] A pixel definition layer formed on the first electrode layer, wherein the pixel definition layer has openings at the projection positions of the sub-electrodes;

[0021] The first light-emitting organic layer is formed on the pixel definition layer.

[0022] Optionally, the first light-emitting electrode and the second light-emitting electrode have the same shape.

[0023] Optionally, the first light-emitting organic layer is a red light-emitting organic layer, the second light-emitting organic layer is a green light-emitting organic layer, and the third light-emitting organic layer is a blue light-emitting organic layer.

[0024] To achieve the above object, the present invention also provides a method for controlling a light-emitting device, characterized in that the method for controlling a light-emitting device is applied to the light-emitting device as described above; the method for controlling a light-emitting device includes:

[0025] Receiving target display data;

[0026] Determining target sub-data of each light-emitting organic layer according to the target display data;

[0027] Determine the electrical signals output to the three sub - electrodes of the backplane circuit according to each of the target sub - data.

[0028] Optionally, the determining the electrical signals output to the three sub - electrodes of the backplane circuit according to each of the target sub - data includes:

[0029] Determine the target pressure difference corresponding to each light - emitting organic layer according to each of the target sub - data;

[0030] Determine the voltage output to each of the sub - electrodes according to the target pressure difference.

[0031] Optionally, the determining the voltage output to each of the sub - electrodes according to the target pressure difference includes:

[0032] Calculate the sum of the target pressure differences to obtain the target total pressure difference;

[0033] Determine the first voltage output to the first sub - electrode according to the target total pressure difference;

[0034] Determine the second voltage output to the second sub - electrode according to the first voltage and the first target pressure difference, where the first target pressure difference is the target pressure difference corresponding to the first light - emitting organic layer;

[0035] Determine the third voltage output to the third sub - electrode according to the second voltage and the second target pressure difference, where the second target pressure difference is the target pressure difference corresponding to the second light - emitting organic layer.

[0036] To achieve the above object, the present invention further provides a display panel, characterized in that the display panel includes the light - emitting device as described above.

[0037] A light - emitting device, a light - emitting device control method and a display panel proposed by the present invention prepare a backplane circuit on a substrate; prepare a first electrode layer on the backplane circuit; prepare a multi - color stacked light - emitting layer on the first electrode layer, where the multi - color stacked light - emitting layer includes a plurality of light - emitting organic layers, the light - emitting organic layers respectively correspond to different primary colors, and each of the light - emitting organic layers is respectively connected to the backplane circuit through the first electrode layer; prepare a second electrode layer on the multi - color stacked light - emitting layer; prepare a packaging protection layer on the second electrode layer. By setting a multi - color stacked light - emitting layer corresponding to the primary colors, and different light - emitting organic layers are respectively connected to the backplane circuit, it is possible to control different light - emitting organic layers respectively, so as to realize multi - color display by a single light - emitting device. The effect of combining the original red, green, and blue three devices is achieved by one light - emitting device. Therefore, the pixel density PPI can be greatly improved; at the same time, since the stacked light - emitting layer method is adopted, there is no charge cross - flow between different light - emitting layers, so that the light emission color mixing between different colors can be avoided, and single - color light emission is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments in accordance with the present invention, and are used together with the specification to explain the principles of the present invention.

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0040] Figure 1 Schematic structural diagram of the light-emitting device of the present invention;

[0041] Figure 2 Schematic structural diagram of the first layer of the light-emitting device of the present invention;

[0042] Figure 3 Schematic structural diagram of the second layer of the light-emitting device of the present invention;

[0043] Figure 4 Schematic structural diagram of the third layer of the light-emitting device of the present invention;

[0044] Figure 5 Schematic structural diagram of the fourth layer of the light-emitting device of the present invention;

[0045] Figure 6 Schematic structural diagram of the fifth layer of the light-emitting device of the present invention;

[0046] Figure 7 Schematic structural diagram of the sixth layer of the light-emitting device of the present invention;

[0047] Figure 8 Schematic structural diagram of the seventh layer of the light-emitting device of the present invention;

[0048] Figure 9 Schematic structural diagram of the eighth layer of the light-emitting device of the present invention;

[0049] Figure 10 Schematic structural diagram of the ninth layer of the light-emitting device of the present invention;

[0050] Figure 11 Schematic structural diagram of the tenth layer of the light-emitting device of the present invention;

[0051] Figure 12 Schematic structural diagram of the eleventh layer of the light-emitting device of the present invention;

[0052] Figure 13 Schematic structural diagram of the twelfth layer of the light-emitting device of the present invention;

[0053] Figure 14 Schematic flow diagram of the control method of the light-emitting device of the present invention.

[0054] Explanation of the reference numerals in the drawings:

[0055] Label Name Label Name 1 Substrate 9 First light-emitting electrode 2 Backplane circuit 10 Second light-emitting organic layer 3 First conductive terminal 11 Third conductive terminal 4 Flat layer 12 Second light-emitting electrode 5 First electrode layer 13 Third light-emitting organic layer 6 Second conductive terminal 14 Second electrode layer 7 Pixel definition layer 15 Package protection layer 8 First light-emitting organic layer 40 Multi-color stacked light-emitting layer 51 First sub-electrode 53 Third sub-electrode 52 Second sub-electrode Detailed implementation manners

[0056] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0057] The present invention provides a light-emitting device. Referring to Figure 1 , the light-emitting device includes:

[0058] Substrate 1;

[0059] A backplane circuit 2 formed on the substrate 1;

[0060] A first electrode layer 5 formed on the backplane circuit 2, wherein the first electrode layer 5 includes three sub-electrodes insulated from each other;

[0061] A multi-color stacked light-emitting layer 40 formed on the first electrode layer 5, wherein the multi-color stacked light-emitting layer 40 includes a plurality of light-emitting organic layers, the light-emitting organic layers 40 respectively correspond to different primary colors, a light-extracting electrode is arranged between two adjacent light-emitting organic layers 40, and the light-extracting electrodes are respectively connected to the corresponding sub-electrodes;

[0062] A second electrode layer 14 formed on the multi-color stacked light-emitting layer 40.

[0063] The specific type and material of the substrate 1 can be set based on actual needs, including but not limited to glass and plastic. In the present application, the glass substrate 1 is taken as an example for illustration.

[0064] The backplane circuit 2 is used to control the light-emitting device. For example, the backplane circuit 2 is used to construct a TFT; the specific preparation method of the backplane circuit 2 can be set based on actual needs and will not be limited herein.

[0065] The first electrode layer 5 is connected to the backplane circuit 2 to receive the electrical signal output by the backplane circuit 2 and transmit the electrical signal to the multi-color stacked light-emitting layer 40. In this embodiment, the first electrode layer 5 is arranged to include three sub-electrodes, and the three sub-electrodes are insulated from each other and can transmit different electrical signals. Different light-emitting organic layers receive the voltage sent by the backplane circuit through different sub-electrodes, thereby realizing the control of different light-emitting organic layers.

[0066] The three primary colors include red, green, and blue. Different light-emitting organic layers are respectively connected to the backplane circuit 2 through different sub-electrodes, so that the backplane circuit 2 can respectively output electrical signals to different light-emitting organic layers, enabling different light-emitting organic layers to emit light based on different electrical signals. And the light-emitting organic layers respectively correspond to the three primary colors of red, green, and blue. Therefore, a minimum light-emitting unit of the light-emitting device in this embodiment can simultaneously achieve the display of red, green, and blue. By controlling the electrical signals output to different light-emitting organic layers, the display brightness of red, green, and blue can be controlled, and thus the display of different colors is realized. In the existing pixels, there are three minimum light-emitting units including red, green, and blue. That is, under the requirement of realizing the complete light-emitting function, the minimum light-emitting unit in this embodiment can achieve the display of multiple colors. Therefore, only one minimum light-emitting unit is required for one pixel, which reduces the pixel size compared with the three minimum light-emitting units in the prior art. That is, in the position of the original one pixel, three pixels can be set in the technical solution of this embodiment. Based on this feature, the PPI can be increased by three times.

[0067] It can be understood that in the prior art, when preparing the light-emitting organic layer, the FMM evaporation method can be adopted. In the prior art, the minimum light-emitting units are arranged in sequence based on red, green, and blue. That is, the colors between adjacent minimum light-emitting units are different, and the corresponding light-emitting materials are also different. Therefore, during the preparation, if the FMM is deformed, resulting in the overlap between different light-emitting materials, charge cross-current will occur during the use process, causing color mixing problems. In this embodiment, by setting the multi-color stacked light-emitting layer 40, the three primary colors of red, green, and blue are stacked in layers, and there is no overlap between different light-emitting layers, that is, the generation of charge cross-current is avoided, thereby avoiding the occurrence of color mixing problems, ensuring the accuracy of single-color light emission, and thus improving the display effect.

[0068] The second electrode layer 14, the multi-color stacked light-emitting layer 40, and the first electrode layer 5 form a current path.

[0069] It can be understood that an encapsulation protection layer 15 can also be prepared on the second electrode layer 14 to complete the preparation process of the light-emitting device.

[0070] The specific preparation methods of the second electrode layer 14 and the encapsulation protection layer 15 can be set based on actual needs and are not limited here.

[0071] In this embodiment, a multi-color stacked light-emitting layer 40 corresponding to the three primary colors is provided, and different light-emitting organic layers are respectively connected to the backplane circuit 2, so that different light-emitting organic layers can be controlled respectively, thereby realizing the display of multiple colors by a single light-emitting device. The effect of the combination of the original R, G, and B devices is achieved by one light-emitting device. Therefore, the PPI can be greatly improved. At the same time, since the stacked light-emitting layer is adopted, there is no charge cross-current between different light-emitting layers, so that the light mixing between different colors can be avoided, and the single-color light emission can be ensured.

[0072] Further, refer to Figures 2 to 13 together later. On the backplane circuit 2, a plurality of conductive terminals are provided, and the conductive terminals include a first conductive terminal 3, a second conductive terminal 6, and a third conductive terminal 11. The light-emitting device further includes:

[0073] A planarization layer 4 formed on the backplane circuit 2, wherein the planarization layer 4 has an opening at the projection position of the conductive terminal.

[0074] The first electrode layer 5 is formed on the planarization layer 4. The sub-electrodes include a first sub-electrode 51, a second sub-electrode 52, and a third sub-electrode 53. The first sub-electrode 51 is disposed at the projection position of the first conductive terminal 3, the second sub-electrode 52 is disposed at the projection position of the second conductive terminal 6, and the third sub-electrode 53 is disposed at the projection position of the third conductive terminal 11.

[0075] The conductive terminals on the backplane circuit 2 are used to output electrical signals, and the first conductive terminal 3, the second conductive terminal 6, and the third conductive terminal 11 respectively correspond to the output of three electrical signals.

[0076] The planarization layer 4 is used to fill the gaps on the backplane circuit 2 to ensure the flatness of the layer structure thereon. The specific preparation method of the planarization layer 4 can be set according to actual needs and is not limited herein.

[0077] It can be understood that the conductive terminal needs to be connected to the electrode. Therefore, when preparing the planarization layer 4, the position of the conductive terminal needs to be left so that the conductive terminal can be connected to the electrode in the layer structure on the planarization layer 4.

[0078] The first electrode layer 5 is used to receive an electrical signal from a conductive end. Since there are multiple controllable light-emitting organic layers in the multi-color stacked light-emitting layer 40, the first conductive end 3, the second conductive end 6, and the third conductive end 11 need to output different electrical signals to achieve the light emission control of the multiple light-emitting organic layers. Therefore, the first electrode layer 5 in this embodiment is set to include three sub-electrodes, which are insulated from each other and can transmit different electrical signals to achieve the control of different light-emitting organic layers. Since the flat layer 4 has an opening at the projection position of the conductive end, when preparing the first electrode layer 5, the three sub-electrodes can be connected to the corresponding conductive ends.

[0079] Specifically, the first sub-electrode 51 transmits the electrical signal of the first conductive end 3, the second sub-electrode 52 transmits the electrical signal of the second conductive end 6, and the third sub-electrode 53 transmits the electrical signal of the third conductive end 11.

[0080] Furthermore, the light-emitting electrode includes a first light-emitting electrode and a second light-emitting electrode, and the light-emitting organic layer includes a first light-emitting organic layer, a second light-emitting organic layer, and a third light-emitting organic layer; wherein:

[0081] The first light-emitting organic layer 8 is formed on the first electrode layer 5;

[0082] The first light-emitting electrode 9 is formed on the first light-emitting organic layer 8, and the first light-emitting electrode 9 is connected to the second conductive end 6 through the second sub-electrode 52;

[0083] The second light-emitting organic layer 10 is formed on the first light-emitting electrode 9;

[0084] The second light-emitting electrode 12 is formed on the second light-emitting organic layer 10, and the second light-emitting electrode 12 is connected to the third conductive end 11 through the third sub-electrode 53;

[0085] The third light-emitting organic layer 13 is formed on the second light-emitting electrode 12.

[0086] The stacking order of the light-emitting organic layers of different colors can be adjusted based on needs. In this embodiment, the first light-emitting organic layer 8 is taken as a red light-emitting organic layer, the second light-emitting organic layer 10 is taken as a green light-emitting organic layer, and the third light-emitting organic layer 13 is taken as a blue light-emitting organic layer for illustration.

[0087] It can be understood that each light-emitting organic layer further includes a multi-layer structure, such as an electron transport layer, a hole transport layer, an injection layer, a blocking layer, etc., and its specific structure and preparation means can be set based on actual needs.

[0088] The first light-emitting electrode 9 and the second light-emitting electrode 12 are used for electrical signal transmission.

[0089] A first light-emitting organic layer 8, a first light-extracting electrode 9, a second light-emitting organic layer 10, a second light-extracting electrode 12, and a third light-emitting organic layer 13 are sequentially disposed between the first electrode layer 5 and the second electrode layer 14;

[0090] Among them, the first electrode layer 5 transmits an electrical signal through the first conductive end 3, the first light-extracting electrode 9 transmits an electrical signal through the second conductive end 6, and the second light-extracting electrode 12 transmits an electrical signal through the third conductive end 11;

[0091] Therefore, the light-emitting state of the first light-emitting organic layer 8 depends on the voltage difference between the first sub-electrode 51 of the first electrode layer 5 and the first light-extracting electrode 9, the light-emitting state of the second light-emitting organic layer 10 depends on the voltage difference between the first light-extracting electrode 9 and the second light-extracting electrode 12, and the light-emitting state of the third light-emitting organic layer 13 depends on the voltage difference between the second light-extracting electrode 12 and the second electrode layer 14.

[0092] In practical applications, the electrical signals to be output to the first electrode layer 5, the first light-extracting electrode 9, and the second light-extracting electrode 12 can be determined by overall algorithm regulation based on the colors to be displayed by the three light-emitting organic layers.

[0093] It can be understood that the second sub-electrode 52 needs to be connected to the first light-extracting electrode 9. After the first light-emitting organic layer 8 is prepared, the first light-emitting organic layer 8 will cover the second sub-electrode 52. Therefore, it is necessary to remove the part of the first light-emitting organic layer 8 at the projection position of the second sub-electrode 52 so that the first light-extracting electrode 9 can establish an electrical connection with the second sub-electrode 52; the specific removal method can be set according to actual needs, such as laser ablation evaporation.

[0094] The preparation method of the first light-extracting electrode 9 can be set according to actual needs; in this embodiment, the patterned first light-extracting electrode 9 is prepared by FMM evaporation; the same applies to the second light-extracting electrode 12 and will not be elaborated further hereinafter.

[0095] Similarly, the third sub-electrode 53 needs to be connected to the second light-extracting electrode 12. After the second light-emitting organic layer 10 is prepared, the first light-emitting organic layer 8 and the second light-emitting organic layer 10 cover the second sub-electrode 52. Therefore, it is necessary to remove the parts of the first light-emitting organic layer 8 and the second light-emitting organic layer 10 at the projection position of the third sub-electrode 53 so that the second light-extracting electrode 12 can establish an electrical connection with the third sub-electrode 53; the specific removal method can be set according to actual needs, such as laser ablation evaporation.

[0096] Furthermore, the light-emitting device further includes:

[0097] A pixel definition layer 7 formed on the first electrode layer 5, wherein the pixel definition layer 7 has openings at the projection positions of the sub-electrodes;

[0098] The first light-emitting organic layer 8 is formed on the pixel definition layer 7.

[0099] The pixel definition layer 7 is used to define pixel regions, isolate pixels, and prevent optical and electrical crosstalk; the specific preparation method of the pixel definition layer 7 can be set based on actual needs.

[0100] It can be understood that the pixel definition layer 7 is prepared on the first electrode layer 5, and the first electrode layer 5, as an electrical signal transmission layer, needs to be electrically connected to the subsequent first light-emitting organic layer 8, first light-extracting electrode 9, and second light-extracting electrode 12. Therefore, an opening needs to be made at the projection position of the sub-electrode on the pixel definition layer 7, so that when the first light-emitting organic layer 8 is prepared, the first light-emitting organic layer 8 can be connected to the anode electron layer.

[0101] It should be noted that the opening of the pixel definition layer 7 may not exactly match the projection position of the sub-electrode during actual implementation, but it is necessary to ensure that the subsequent first light-emitting organic layer 8 can establish an electrical connection with the first sub-electrode 51, the first light-extracting electrode 9 can establish an electrical connection with the second sub-electrode 52, and the second light-extracting electrode 12 can establish an electrical connection with the third sub-electrode 53.

[0102] Furthermore, the first light-extracting electrode 9 and the second light-extracting electrode 12 have the same shape.

[0103] It can be understood that both the first light-extracting electrode 9 and the second light-extracting electrode 12 are prepared by FMM evaporation. During the preparation process, a pattern needs to be constructed through a mask template Mask; in this embodiment, by setting the shapes of the first light-extracting electrode 9 and the second light-extracting electrode 12 to be the same, the two can use the same specification Mask, reducing the Mask development cycle and quantity.

[0104] In addition, it should be noted that in the solution of the present application, only the FMM evaporation method needs to be used when preparing the first light-extracting electrode 9 and the second light-extracting electrode 12. Compared with the traditional RGB evaporation method, the usage amount of FMM is reduced, and the development cycle and cost can be reduced.

[0105] The following describes the overall preparation process of the light-emitting device of the present application:

[0106] See Figure 2 , where Figure 2 b is Figure 2 a cross-sectional view of a at A-A. First, a backplane circuit 2 is prepared on the glass substrate 1. There are multiple conductive terminals 3, 6, 11 on the backplane circuit for connecting electrodes. A planarization layer 4 is prepared, and the planarization layer 4 has an opening at the projection position of the conductive terminal;

[0107] See Figure 3 , whereFigure 3 b is Figure 3 The cross-sectional view of a along the line A-A. The first electrode layer 5 is prepared on the flat layer 4. The first electrode layer 5 includes three mutually insulated sub-electrodes;

[0108] See Figure 4 , wherein, Figure 4 b is Figure 4 The cross-sectional view of a along the line A-A. The pixel definition layer 7 is prepared on the first electrode layer. The pixel definition layer 7 has openings at the projection positions of the sub-electrodes;

[0109] See Figure 5 , wherein, Figure 5 b is Figure 5 The cross-sectional view of a along the line A-A. A whole-surface red (first) light-emitting organic layer 8 composed of multiple layers is vapor-deposited above the pixel definition layer 7;

[0110] See Figure 6 , wherein, Figure 6 b is Figure 6 The cross-sectional view of a along the line A-A. The projection position of the red light-emitting organic layer 8 at the second conductive end 6 is removed at a fixed point to expose the second conductive end 6;

[0111] See Figure 7 , wherein, Figure 7 b is Figure 7 The cross-sectional view of a along the line A-A. A patterned first light-emitting electrode 9 is prepared by vapor-depositing using a FMM above the red light-emitting organic layer 8. The first light-emitting electrode 9 is sequentially connected to the lower backplane circuit 2 through the second conductive end 6, realizing the control of the voltage of the first light-emitting electrode 9 by the backplane circuit 2;

[0112] See Figure 8 , wherein, Figure 8 b is Figure 8 The cross-sectional view of a along the line A-A. A whole-surface green (second) light-emitting organic layer 10 composed of multiple layers is vapor-deposited above the first light-emitting electrode 9;

[0113] See Figure 9 , the projection positions of the red light-emitting organic layer 8 and the green light-emitting organic layer 10 at the third conductive end 11 are removed at fixed points to expose the third conductive end 11;

[0114] See Figure 10 , wherein, Figure 10 b is Figure 10 The cross-sectional view of a along the line A-A. A patterned second light-emitting electrode 12 is prepared by vapor-depositing using a FMM above the green light-emitting organic layer 10. The second light-emitting electrode 12 is sequentially connected to the lower backplane circuit 2 through the third conductive end 11, realizing the control of the voltage of the second light-emitting electrode 12 by the backplane circuit 2;

[0115] See Figure 11 , wherein, Figure 11 b is Figure 11 The cross-sectional view of a along A-A, and a multi-layered overall blue (third) light-emitting organic layer 13 is deposited and prepared above the second light-emitting electrode 12;

[0116] See Figure 12 , wherein, Figure 12 b is Figure 12 The cross-sectional view of a along A-A, and a second electrode layer 14 is prepared above the blue light-emitting organic layer 13;

[0117] See Figure 13 , wherein, Figure 13 b is Figure 13 The cross-sectional view of a along A-A, and a packaging and protective layer 15 is prepared above the second electrode layer 14.

[0118] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be carried out in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0119] To achieve the above object, the present invention also provides a method for controlling a light-emitting device. The method for controlling a light-emitting device is applied to the light-emitting device as described above. See Figure 14 , and the method for controlling a light-emitting device includes the steps:

[0120] Step S10, receiving target display data;

[0121] Step S20, determining target sub-data of each light-emitting organic layer according to the target display data;

[0122] Step S30, determining electrical signals of three sub-electrodes output to the backplane circuit according to each of the target sub-data.

[0123] The target display data is data indicating the display of pixels; it can be understood that the light-emitting device applied in this embodiment includes light-emitting organic layers corresponding to red, green, and blue colors respectively. Therefore, the light-emitting device in this embodiment can be used as a pixel, and the target display data indicates the display state of the light-emitting device. Specifically, the target display data indicates the display states of each light-emitting organic layer, and the display states of each light-emitting organic layer are superimposed to achieve the display of the light-emitting device, that is, the pixel. Specifically, the target display data can indicate the gray levels of the red light-emitting organic layer, the green light-emitting organic layer, and the blue light-emitting organic layer.

[0124] The target sub-data indicates the display state of a single light-emitting organic layer; that is, one light-emitting organic layer corresponds to one target sub-data; specifically, the target sub-data indicates the gray scale corresponding to the light-emitting organic layer.

[0125] The sub-electrodes respectively transmit electrical signals to the first electrode layer and the light-emitting electrode; therefore, by controlling the electrical signals output to the sub-electrodes, the electrical states on the first electrode layer and the light-emitting electrode can be set. And the display of the light-emitting organic layer is controlled based on the electrodes on the upper and lower sides. Therefore, outputting electrical signals corresponding to the target sub-data to the three sub-electrodes can achieve the control of the display of each light-emitting organic layer, and thus achieve pixel display.

[0126] In this embodiment, by setting multi-color stacked light-emitting layers corresponding to the three primary colors, and different light-emitting organic layers are respectively connected to the backplane circuit, it is possible to control different light-emitting organic layers respectively, so as to realize the display of multiple colors by a single light-emitting device. The effect of combining the original red, green, and blue devices is achieved by one light-emitting device. Therefore, the pixel density PPI can be greatly improved; at the same time, due to the adoption of the stacked light-emitting layer method, there is no charge cross-current between different light-emitting layers, so that the light emission mixing between different colors can be avoided, and single-color light emission can be ensured.

[0127] Further, the step S30 includes:

[0128] Step S31, determining the target pressure difference corresponding to each light-emitting organic layer according to each of the target sub-data;

[0129] Step S32, determining the voltage output to each of the sub-electrodes according to the target pressure difference.

[0130] The target pressure difference is used to indicate the voltage difference required at both ends of the light-emitting organic layer when the light-emitting organic layer displays the target sub-data; it can be understood that the gray scale displayed by the light-emitting organic layer is determined based on the voltage difference between its upper and lower sides, and the multi-color stacked light-emitting layer is jointly controlled by multiple electrodes. Specifically, the gray scale of the first light-emitting organic layer depends on the voltage difference between the first electrode layer and the first light-emitting electrode, the gray scale of the second light-emitting organic layer depends on the voltage difference between the first light-emitting electrode and the second light-emitting electrode, and the gray scale of the third light-emitting organic layer depends on the voltage difference between the second light-emitting electrode and the second electrode layer. Therefore, after the voltages of each sub-electrode are determined, that is, after the first electrode layer, the first light-emitting electrode, and the second light-emitting electrode are determined, the light-emitting state of the multi-color stacked light-emitting layer is determined.

[0131] The target sub-data is embodied as an indication of the gray scale of the light-emitting organic layer; the corresponding relationship between the gray scale and the pressure difference can be set in advance. After receiving the target sub-data, the corresponding target pressure difference is matched according to the corresponding relationship; it can be understood that the corresponding relationships between the gray scales and the pressure differences of different light-emitting organic layers can be different and can be determined based on actual experiments.

[0132] Further, the step S32 includes:

[0133] Step S321, calculating the sum of the target pressure differences to obtain a target total pressure difference;

[0134] Step S322, determining a first voltage output to the first sub-electrode according to the target total pressure difference;

[0135] Step S323, determining a second voltage output to the second sub-electrode according to the first voltage and a first target pressure difference, where the first target pressure difference is the target pressure difference corresponding to the first light-emitting organic layer;

[0136] Step S324, determining a third voltage output to the third sub-electrode according to the second voltage and a second target pressure difference, where the second target pressure difference is the target pressure difference corresponding to the second light-emitting organic layer.

[0137] The first light-emitting electrode serves as the cathode of the first light-emitting organic layer and also serves as the anode of the second light-emitting organic layer; the second light-emitting electrode serves as the cathode of the second light-emitting organic layer and also serves as the anode of the third light-emitting organic layer; therefore, when determining the output voltage, it is necessary to determine based on the overall response of the multi-color light-emitting organic layer to the voltage.

[0138] The target pressure difference of the first light-emitting organic layer is the voltage difference between the first sub-electrode and the first light-emitting electrode; the target pressure difference of the second light-emitting organic layer is the voltage difference between the first light-emitting electrode and the second light-emitting electrode; the target pressure difference of the third light-emitting organic layer is the voltage difference between the second light-emitting electrode and the second electrode layer; that is, a continuous voltage control range is formed among the first sub-electrode, the first light-emitting electrode, the second light-emitting electrode, and the second electrode layer; therefore, the sum of the target pressure differences, that is, the target total pressure difference, is the voltage difference between the first sub-electrode and the second electrode layer, and the second electrode layer is the cathode electrode in the light-emitting device, and its voltage value is determined and is a common voltage. Therefore, the first voltage output to the first sub-electrode can be determined by the common voltage and the target total voltage; after the first voltage is determined, since the difference between the first light-emitting electrode and the first sub-electrode is the first target pressure difference, the second voltage output to the first light-emitting electrode, that is, the second sub-electrode, can be determined; after the second voltage is determined, since the difference between the second light-emitting electrode and the first light-emitting electrode is the second target pressure difference, the second voltage output to the second light-emitting electrode, that is, the third sub-electrode, can be determined; thus far, the voltages of the first sub-electrode, the first light-emitting electrode, the second light-emitting electrode, and the second electrode layer have all been determined, realizing the control of the display state of the light-emitting device.

[0139] To achieve the above object, the present invention further provides a display panel, and the display panel includes the light-emitting device as described above.

[0140] In the present invention, the terms "first", "second", "third", "fourth", and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0141] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0142] Although the embodiments of the present invention have been shown and described above, the scope of protection of the present invention is not limited thereto. It can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, and substitutions to the above embodiments within the scope of the present invention, and these changes, modifications, and substitutions should all be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be subject to the scope of protection of the claims.

Claims

1. A light-emitting device, characterized in that, The light-emitting device includes: a substrate; a backplane circuit formed on the substrate; a first electrode layer formed on the backplane circuit, wherein the first electrode layer includes three sub-electrodes insulated from each other; a multi-color stacked light-emitting layer formed on the first electrode layer, wherein the multi-color stacked light-emitting layer includes a plurality of light-emitting organic layers, the light-emitting organic layers respectively correspond to different primary colors, an out-coupling electrode is disposed between two adjacent light-emitting organic layers, and the out-coupling electrodes are respectively connected to the corresponding sub-electrodes; a second electrode layer formed on the multi-color stacked light-emitting layer; a plurality of conductive terminals are disposed on the backplane circuit, and the conductive terminals include a first conductive terminal, a second conductive terminal, and a third conductive terminal; the light-emitting device further includes: a planarization layer formed on the backplane circuit, wherein the planarization layer has an opening at a projected position of the conductive terminal; the first electrode layer is formed on the planarization layer, wherein the sub-electrodes include a first sub-electrode, a second sub-electrode, and a third sub-electrode, the first sub-electrode is disposed at a projected position of the first conductive terminal, the second sub-electrode is disposed at a projected position of the second conductive terminal, and the third sub-electrode is disposed at a projected position of the third conductive terminal; the out-coupling electrodes include a first out-coupling electrode and a second out-coupling electrode, the first out-coupling electrode and the second out-coupling electrode have the same shape, and the light-emitting organic layers include a first light-emitting organic layer, a second light-emitting organic layer, and a third light-emitting organic layer; wherein: the first light-emitting organic layer is formed on the first electrode layer; the first out-coupling electrode is formed on the first light-emitting organic layer, and the first out-coupling electrode is connected to the second conductive terminal through the second sub-electrode; the second light-emitting organic layer is formed on the first out-coupling electrode; the second out-coupling electrode is formed on the second light-emitting organic layer, and the second out-coupling electrode is connected to the third conductive terminal through the third sub-electrode; the third light-emitting organic layer is formed on the second out-coupling electrode.

2. The light-emitting device according to claim 1, characterized in that, The light-emitting device further includes: a pixel definition layer formed on the first electrode layer, wherein the pixel definition layer has an opening at a projected position of the sub-electrode; the first light-emitting organic layer is formed on the pixel definition layer.

3. The method for manufacturing a light-emitting device according to claim 1, characterized in that, The first light-emitting organic layer is a red light-emitting organic layer, the second light-emitting organic layer is a green light-emitting organic layer, and the third light-emitting organic layer is a blue light-emitting organic layer.

4. A method for controlling a light-emitting device, characterized in that, The method for controlling the light-emitting device is applied to the light-emitting device according to any one of claims 1 to 3; the method for controlling the light-emitting device includes: receiving target display data; determining target sub-data of each light-emitting organic layer according to the target display data; determining electrical signals output to the three sub-electrodes of the backplane circuit according to the target sub-data.

5. The method for controlling a light-emitting device according to claim 4, wherein The determining the electrical signals output to the three sub-electrodes of the backplane circuit according to the target sub-data includes: determining a target pressure difference corresponding to each light-emitting organic layer according to the target sub-data; determining the voltage output to each sub-electrode according to the target pressure difference.

6. The method for controlling a light-emitting device according to claim 5, wherein The determining the voltage output to each sub-electrode according to the target pressure difference includes: Calculate the sum of the target pressure differences to obtain the total target pressure difference; Determine the first voltage output to the first sub-electrode according to the total target pressure difference; Determine the second voltage output to the second sub-electrode according to the first voltage and the first target pressure difference, where the first target pressure difference is the target pressure difference corresponding to the first light-emitting organic layer; Determine the third voltage output to the third sub-electrode according to the second voltage and the second target pressure difference, where the second target pressure difference is the target pressure difference corresponding to the second light-emitting organic layer.

7. A display panel, characterized in that, The display panel includes the light-emitting device according to any one of claims 1 to 3.

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