Light-emitting device, display panel and display device

Abstract

The invention provides a light-emitting device, a display panel and a display device.The light-emitting device comprises a light-emitting device layer, the light-emitting device layer comprises a first light-emitting layer, a second light-emitting layer, a third light-emitting layer and a half-pass and half-resistance layer which are arranged in a stacked mode, and any two adjacent light-emitting layers in the first light-emitting layer, the second light-emitting layer and the third light-emitting layer are different in light-emitting color; the half-pass and half-resistance layers are arranged between the first light-emitting layer and the second light-emitting layer and between the second light-emitting layer and the third light-emitting layer; the common electrode layer is arranged on one side, deviating from the second light-emitting layer, of the first light-emitting layer; the first electrode comprises a first sub-electrode, a second sub-electrode and a third sub-electrode, the first sub-electrode is conductively connected with the first light-emitting layer, the second sub-electrode is conductively connected with the second light-emitting layer, and the third sub-electrode is conductively connected with the third light-emitting layer; the half-pass and half-resistance layer allows the first particles to pass through and blocks the second particles. The light-emitting device provided by the invention can reduce color cast and realize colorful display, and when the light-emitting device is used for the display panel, the pixel density of the display panel can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a light-emitting device, a display panel and a display apparatus. Background Art

[0002] Display panels are widely used in electronic devices such as mobile phones, tablets, monitors and TVs due to their advantages of flatness, low power consumption, no electromagnetic radiation, high resolution, high contrast, easy integration and light weight. With the development of display technology, display panels are no longer just a carrier for conveying text information. They can be used to realize traffic positioning, mobile payment, video chat, email sending and receiving and other functions, bringing people rich personal experience and communication anytime and anywhere. As a result, users have higher and higher performance requirements for display panels.

[0003] However, the performance of display panels needs to be improved. Summary of the invention

[0004] The present application provides a light-emitting device, a display panel and a display apparatus, which are beneficial to improving the performance of the display panel.

[0005] In the first aspect, the light-emitting device provided according to the embodiment of the present application includes a light-emitting device layer, a common electrode layer and a first electrode; the light-emitting device layer includes a semi-transmissive and semi-blocking layer and a first light-emitting layer, a second light-emitting layer and a third light-emitting layer stacked in sequence, the light-emitting colors of any two adjacent ones of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer are different, and the semi-transmissive and semi-transmissive layer is arranged between the first light-emitting layer and the second light-emitting layer and between the second light-emitting layer and the third light-emitting layer; the common electrode layer is arranged on the side of the first light-emitting layer away from the second light-emitting layer, and the common electrode layer provides first particles to the light-emitting device layer; the first electrode has opposite polarities to the common electrode, and the first electrode provides second particles to the light-emitting device layer, and the first electrode includes a first sub-electrode, a second sub-electrode and a third sub-electrode insulated from each other, the first sub-electrode is conductively connected to the first light-emitting layer, the second sub-electrode is conductively connected to the second light-emitting layer, and the third sub-electrode is conductively connected to the third light-emitting layer; wherein the semi-transmissive and semi-blocking layers are configured to allow the first particles to pass through and to block the second particles.

[0006] In some embodiments, the light-emitting device layer includes a first through hole and a second through hole, the first through hole passes through the third light-emitting layer and the second light-emitting layer, and the second through hole passes through the three light-emitting layers; the first sub-electrode is passed through the first through hole and is insulated from the third light-emitting layer and the second light-emitting layer, respectively, and the second sub-electrode is passed through the second through hole and is insulated from the third light-emitting layer.

[0007] In some embodiments, the light emitting device layer further includes an insulating layer, and the insulating layer is disposed between an inner wall of the first through hole and the first sub-electrode, and between an inner wall of the second through hole and the second sub-electrode.

[0008] In some embodiments, the insulating layer is further disposed on a side of the light emitting device layer away from the common electrode layer, and is located between any two of the first sub-electrode, the second sub-electrode and the third sub-electrode.

[0009] In some embodiments, the common electrode layer is an anode and the first electrode is a cathode.

[0010] In some embodiments, the material of the half-through and half-resistance layer includes P-type doped aluminum gallium nitride; and / or, the material of the half-through and half-resistance layer includes undoped gallium nitride.

[0011] In some embodiments, the light emitting device further comprises a particle injection layer, which is disposed between the common electrode layer and the first light emitting layer, and the particle injection layer injects the first particles into the light emitting device layer.

[0012] In some embodiments, the common electrode layer is an anode, and the material of the particle injection layer includes P-type doped gallium nitride.

[0013] In some embodiments, the light-emitting device layer also includes a particle transport layer, which is arranged between the half-pass and half-resistance layer and the first light-emitting layer, between the half-pass and half-resistance layer and the second light-emitting layer, and on the side of the third light-emitting layer away from the second light-emitting layer, and the first sub-electrode, the second sub-electrode and the third sub-electrode are respectively conductively connected to the particle transport layer.

[0014] In some embodiments, the first electrode is a cathode, and the material of the particle transport layer includes n-type gallium nitride.

[0015] In some embodiments, the thickness h of the particle transport layer satisfies: 5 nm≤h≤50 nm.

[0016] In some embodiments, the common electrode layer is transparent.

[0017] In some embodiments, the material of the common electrode layer includes fumed tin oxide.

[0018] In some embodiments, the wavelength of light emitted by the first light-emitting layer is shorter than the wavelength of light emitted by the second light-emitting layer, and the wavelength of light emitted by the second light-emitting layer is shorter than the wavelength of light emitted by the third light-emitting layer.

[0019] In some embodiments, the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer are configured to emit one of red light, blue light, and green light, respectively.

[0020] In some embodiments, the first light-emitting layer is configured to emit blue light, the second light-emitting layer is configured to emit green light, and the third light-emitting layer is configured to emit red light.

[0021] In a second aspect, an embodiment of the present application provides a display panel including an array substrate and a plurality of light-emitting devices as provided in any of the above embodiments, wherein the plurality of light-emitting devices are arranged at intervals on the array substrate, and the array substrate is electrically connected to the first electrode to drive the light-emitting devices to emit light.

[0022] In some embodiments, at least two light emitting devices share a common electrode layer.

[0023] In a third aspect, an embodiment of the present application provides a display device, comprising a display panel provided by any of the above embodiments.

[0024] The light-emitting device, display panel and display device provided in the embodiments of the present application, the light-emitting device layer includes a first light-emitting layer, a second light-emitting layer and a third light-emitting layer, and the light-emitting colors of any two adjacent ones of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer are different, and the first light-emitting layer, the second light-emitting layer and the third light-emitting layer are driven by the first sub-electrode, the second sub-electrode and the third sub-electrode to emit light independently, and under the premise of realizing the colorful display of the light-emitting device, the second particles are prevented from migrating between any two adjacent ones of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer by the half-pass and half-blocking layers, so as to reduce the risk of interference between the first light-emitting layer, the second light-emitting layer and the third light-emitting layer, which is conducive to reducing the risk of color deviation of the light-emitting device. When the light-emitting device is applied to the display panel, the light-emitting device occupies a small area and can realize colorful display, which is conducive to increasing the effective light-emitting area and pixel arrangement density of the display panel, and is conducive to reducing the risk of color deviation of the display panel, thereby improving the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the accompanying drawings, the same components are marked with the same reference numerals. The accompanying drawings are not drawn to scale.

[0026] Figure 1 A top view of a light emitting device provided in an embodiment of the present application;

[0027] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along AA;

[0028] Figure 3 A top view of another light emitting device provided in an embodiment of the present application;

[0029] Figure 4 for Figure 3 A schematic diagram of a cross-sectional structure along BB;

[0030] Figure 5 for Figure 3 Another schematic diagram of the cross-sectional structure along BB;

[0031] Figure 6 for Figure 3 Another schematic cross-sectional view along BB;

[0032] Figure 7 A top view of a display panel provided in an embodiment of the present application;

[0033] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along CC;

[0034] Fig. 9 A top view of a display device provided in an embodiment of the present application.

[0035] In the drawings, the figures are not necessarily drawn to scale.

[0036] Description of reference numerals:

[0037] 100. Display panel;

[0038] 110. Array substrate;

[0039] 20. Light-emitting device;

[0040] 21, light-emitting device layer; 21a, first through hole; 21b, second through hole; 211, first light-emitting layer; 212, second light-emitting layer; 213, third light-emitting layer; 214, half-pass and half-blocking layer; 215, particle transport layer;

[0041] 22. Common electrode layer;

[0042] 23, first electrode; 231, first sub-electrode; 232, second sub-electrode; 233, third sub-electrode;

[0043] 24. Insulation layer;

[0044] 25. Particle injection layer;

[0045] 10. Display device. DETAILED DESCRIPTION

[0046] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0047] In addition, for the sake of understanding and ease of description, the size and thickness of each configuration shown in the figures are arbitrarily shown, but the present application is not limited thereto. In the figures, for the sake of clarity, the thickness of layers, films, panels, regions, etc. are exaggerated. In the figures, for better understanding and ease of description, the thickness of some layers and regions is exaggerated.

[0048] It is understood that when an element such as a layer, film, region, or substrate is described as being "on" another element, the element may be directly on the other element, or intervening elements may also be present. In contrast, when an element is described as being "directly on" another element, there are no intervening elements. Furthermore, throughout the specification, the term "on" a target element means being positioned above or below the target element, and does not necessarily mean being positioned "at the upper side" based on the direction of gravity.

[0049] In addition, unless explicitly described to the contrary, the word “comprise” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0050] Display panels are widely used in electronic devices such as mobile phones and tablet computers. In order to realize the display function of display panels, such as OLED (Organic Light Emitting Diode) or Micro-LED (Micro Light Emitting Diode) display panels, light-emitting devices are usually arranged inside the display panels. The larger the effective light-emitting area of ​​the light-emitting devices in the display panel and the denser the arrangement of the light-emitting devices, the more conducive it is to improve the PPI (Pixels Per Inch, pixel density) of the display panel.

[0051] However, in the related art, in order to increase the PPI of the display panel, light-emitting structures in the display panel for emitting different colors may interfere with each other, which may easily cause color deviation of the display panel and seriously affect the display effect of the display panel.

[0052] In view of this, embodiments of the present application provide a light emitting device, a display panel, and a display device. Embodiments of the display panel and the display device will be described below in conjunction with the accompanying drawings.

[0053] like Figure 1 and Figure 2 As shown, the light-emitting device 20 provided according to the embodiment of the present application includes a light-emitting device layer 21, a common electrode layer 22 and a first electrode 23. The light-emitting device layer 21 includes a half-pass half-resistance layer 214 and a first light-emitting layer 211, a second light-emitting layer 212 and a third light-emitting layer 213 stacked in sequence, and the light-emitting colors of any two adjacent ones of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are different, and the half-pass half-resistance layer 214 is arranged between the first light-emitting layer 211 and the second light-emitting layer 212 and between the second light-emitting layer 212 and the third light-emitting layer 213. The common electrode layer 22 is arranged on the side of the first light-emitting layer 211 away from the second light-emitting layer 212, and the common electrode layer 22 provides the first particles to the light-emitting device layer 21. The first electrode 23 has a polarity opposite to that of the common electrode layer 22. The first electrode 23 provides second particles to the light-emitting device layer 21. The first electrode 23 includes a first sub-electrode 231, a second sub-electrode 232, and a third sub-electrode 233 that are insulated from each other. The first sub-electrode 231 is conductively connected to the first light-emitting layer 211, the second sub-electrode 232 is conductively connected to the second light-emitting layer 212, and the third sub-electrode 233 is conductively connected to the third light-emitting layer 213. The half-pass and half-blocking layer 214 is configured to allow the first particles to pass through and to block the second particles.

[0054] If the light-emitting colors of any two adjacent ones of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are different, then the light-emitting colors of the first light-emitting layer 211 and the second light-emitting layer 212 are different, and the light-emitting colors of the second light-emitting layer 212 and the third light-emitting layer 213 are different. The light-emitting colors of the first light-emitting layer 211 and the third light-emitting layer 213 may be the same or different.

[0055] Exemplarily, the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can be arranged to emit light of different colors, respectively, and the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are stacked, so that the three can emit light simultaneously or separately along the same side of the stacking direction of the three, and by controlling whether one or more of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 emit light and the brightness of the light, one or more of the three can emit light in the same direction along the stacking direction and mix, so that the light-emitting device 20 emits more diverse colors.

[0056] Optionally, the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can be used to emit one of red light, green light and blue light, respectively. By controlling whether the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 emit light and the brightness of the light, the light-emitting device 20 can emit red light, blue light, green light or a mixture of at least two of red light, blue light and green light at any brightness, thereby realizing the multi-color light emission of the light-emitting device 20.

[0057] That is, the light emitting device 20 can emit more colorful colors by controlling the parameters such as whether the first light emitting layer 211, the second light emitting layer 212 and the third light emitting layer 213 emit light and the light emitting brightness. Figure 7 After the display panel 100 shown, the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 of the light-emitting device 20 can be arranged to be stacked along the thickness direction of the display panel 100. In this way, a single light-emitting device 20 occupies a smaller area of ​​the display panel 100, and can display more colorful colors, which is beneficial to improving the PPI of the display panel 100.

[0058] The common electrode layer 22 and the first electrode 23 have opposite polarities, so the common electrode layer 22 can be set as an anode and the first electrode 23 can be set as a cathode, or the common electrode layer 22 can be set as a cathode and the first electrode 23 can be set as an anode. The first particles generated by the common electrode layer 22 can migrate to the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, and the second particles generated by the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 of the first electrode 23 can migrate to the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 respectively, so that the first particles and the second particles are respectively combined in the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, so that the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can emit light independently.

[0059] Exemplarily, when the common electrode layer 22 is an anode and the first electrode 23 is a cathode, the first particles are holes and the second particles are electrons. The holes generated by the common electrode layer 22 are combined with the electrons generated by the first sub-electrode 231 in the first light-emitting layer 211 to realize the light emission of the first light-emitting layer 211. Similarly, the electrons generated by the second sub-electrode 232 and the holes generated by the common electrode layer 22 are combined in the second light-emitting layer 212 to realize the light emission of the second light-emitting layer 212. The electrons generated by the third sub-electrode 233 and the holes generated by the common electrode layer 22 are combined in the third light-emitting layer 213 to realize the light emission of the third light-emitting layer 213.

[0060] The first sub-electrode 231 is conductively connected to the first light-emitting layer 211, so the second particles generated by the first sub-electrode 231 can migrate to the first light-emitting layer 211. Similarly, the second particles generated by the second sub-electrode 232 and the third sub-electrode 233 can migrate to the second light-emitting layer 212 and the third light-emitting layer 213 respectively.

[0061] It can be understood that the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can be controlled to emit light independently and the brightness of their light by controlling whether the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 are powered on and the voltage or current.

[0062] Since the half-pass half-resistance layer 214 allows the first particles to pass through, but blocks the second particles from passing through, the first particles generated when the common electrode layer 22 is powered can migrate to the first light-emitting layer 211, migrate to the second light-emitting layer 212 through the first light-emitting layer 211 and the half-pass half-resistance layer 214, and then migrate to the third light-emitting layer 213 through the second light-emitting layer 212 and the half-pass half-resistance layer 214. In other words, the common electrode layer 22 provides the first particles for the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213.

[0063] The first sub-electrode 231 can be arranged through the third light-emitting layer 213 and the second light-emitting layer 212 and insulated therefrom, and a half-pass and half-blocking layer 214 is respectively provided between the first light-emitting layer 211 and the second light-emitting layer 212 and between the second light-emitting layer 212 and the third light-emitting layer 213, and the half-pass and half-blocking layer 214 can prevent the second particles from passing through, so the second particles generated by the first sub-electrode 231 will not migrate to the third light-emitting layer 213 and the second light-emitting layer 212, and similarly, the second particles generated by the second sub-electrode 232 will not migrate to the first light-emitting layer 211 and the third light-emitting layer 213, and the second particles generated by the third sub-electrode 233 will not migrate to the second light-emitting layer 212 and the first light-emitting layer 211. In this way, the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can emit light independently, reducing the risk of mutual interference among the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213.

[0064] The first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 are insulated from each other and are electrically connected to relevant driving devices on the side of the light-emitting device layer 21 away from the common electrode layer 22, so as to drive the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 of the light-emitting device 20 to emit light independently.

[0065] Optionally, the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 can extend along the stacking direction respectively and be electrically connected to the driving device of the display panel 100, or the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 respectively form corresponding patterns on the side of the light-emitting device layer 21 away from the common electrode layer 22 to connect with the connecting wires in the driving device.

[0066] It can be understood that the light-emitting device 20 provided in the embodiment of the present application can be applied to an OLED display panel or a Micro-LED display panel.

[0067] When the light-emitting device 20 is applied to the display panel 100, a single light-emitting device 20 can realize a colorful display. Therefore, there is no need to arrange sub-pixels that emit light of different colors in the display panel 100, and a single light-emitting device 20 occupies a smaller area to realize a colorful display. This is beneficial to improving the pixel density of the display panel 100.

[0068] The light-emitting device 20 provided in the embodiment of the present application is provided with a light-emitting device layer 21 including a first light-emitting layer 211, a second light-emitting layer 212 and a third light-emitting layer 213, and the light-emitting colors of any two adjacent ones of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are different, and the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are driven to emit light independently by the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 respectively. On the premise of realizing the multi-colored display of the light-emitting device 20, the second particles are prevented from migrating between any two adjacent ones of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 by the half-pass and half-blocking layer 214, so as to reduce the risk of interference in the light emission of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, which is beneficial to improving the accuracy of the light-emitting color of the light-emitting device 20. When the light-emitting device 20 is applied to the display panel 100, the light-emitting device 20 occupies a small area and can realize colorful display, which is beneficial to increase the effective light-emitting area and pixel arrangement density of the display panel 100, and is beneficial to reduce the risk of color deviation of the display panel 100, thereby improving the display effect of the display panel 100.

[0069] Please continue reading Figure 1 and Figure 2In some embodiments, the light-emitting device layer 21 includes a first through hole 21a and a second through hole 21b, the first through hole 21a penetrates the third light-emitting layer 213 and the second light-emitting layer 212, and the second through hole 21b penetrates the third light-emitting layer 213; the first sub-electrode 231 is arranged in the first through hole 21a, and is insulated from the third light-emitting layer 213 and the second light-emitting layer 212 respectively, and the second sub-electrode 232 is arranged in the second through hole 21b, and is insulated from the third light-emitting layer 213.

[0070] The first through hole 21a penetrates the third light-emitting layer 213 and the second light-emitting layer 212. Of course, the first through hole 21a also penetrates the semi-through and semi-resistive layer 214 between the third light-emitting layer 213 and the second light-emitting layer 212, that is, the first through hole 21a penetrates the second light-emitting layer 212 and the film layer of the second light-emitting layer 212 away from the first light-emitting layer 211, so that the first sub-electrode 231 can be conductively connected to the first light-emitting layer 211 after passing through the first through hole 21a.

[0071] The first sub-electrode 231 is insulated from the third light-emitting layer 213 and the second light-emitting layer 212, so the second particles generated by the first sub-electrode 231 when powered on will not be transmitted to the third light-emitting layer 213 and the second light-emitting layer 212. The second sub-electrode 232 is insulated from the third light-emitting layer 213, so the second particles generated by the second sub-electrode 232 when powered on will not be transmitted to the third light-emitting layer 213.

[0072] The first sub-electrode 231 can be directly connected to the first light-emitting layer 211, or the first sub-electrode 231 can be connected through an intermediate transmission layer, so as to realize the first sub-electrode 231 to transmit the second particles to the first light-emitting layer 211. Similarly, the second sub-electrode 232 can be directly connected to the second light-emitting layer 212, or the two can be connected through an intermediate transmission layer.

[0073] Optionally, the cross-sections of the first through hole 21a and the second through hole 21b may be square, circular or other shapes respectively, which can be selected according to actual needs.

[0074] The first through hole 21a and the second through hole 21b can be formed by an etching process using a mask after the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 are prepared, and then the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 are formed by a deposition process.

[0075] Therefore, the light-emitting device layer 21 is provided with a first through hole 21a and a second through hole 21b, so as to realize conductive connection between the first sub-electrode 231 and the first light-emitting layer 211, and between the second sub-electrode 232 and the second light-emitting layer 212, so as to realize that the first sub-electrode 231 provides the second particles to the first light-emitting layer 211, and the second sub-electrode 232 provides the second light-emitting layer 212, and the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 can all be led out from the side of the light-emitting device layer 21 away from the common electrode layer 22, so as to facilitate electrical connection between the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 and the relevant driving devices of the light-emitting device 20.

[0076] like Figures 1 to 4 As shown, in some embodiments, the light emitting device layer 21 further includes an insulating layer 24 , which is disposed between the inner wall of the first through hole 21 a and the first sub-electrode 231 , and between the inner wall of the second through hole 21 b and the second sub-electrode 232 .

[0077] After the first through hole 21 a and the second through hole 21 b are etched, the insulating layer 24 can be deposited on the inner walls of the first through hole 21 a and the second through hole 21 b through a mask.

[0078] Optionally, the material of the insulating layer 24 may include one or more of silicon oxide, silicon nitride and aluminum oxide to achieve insulating isolation between the first sub-electrode 231 and the second light-emitting layer 212 and the third light-emitting layer 213, and between the second sub-electrode 232 and the third light-emitting layer 213, thereby reducing the risk of mutual interference among the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213.

[0079] like Figure 3 and Figure 4 As shown, in some embodiments, the insulating layer 24 is also disposed on a side of the light emitting device layer 21 away from the common electrode layer 22 , and is located between any two of the first sub-electrode 231 , the second sub-electrode 232 and the third sub-electrode 233 .

[0080] In this way, the insulation isolation of the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 is achieved through the insulating layer 24, thereby reducing the risk of short circuit between different first electrodes 23, and by setting the insulating layer 24, the patterning of the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 can be achieved, which facilitates the connection of the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 to the driving device respectively.

[0081] In some embodiments, the common electrode layer 22 is an anode, and the first electrode 23 is a cathode.

[0082] In this way, the first particle is a hole and the second particle is an electron. The common electrode layer 22 can always be in an electrically connected state, that is, the common electrode layer 22 can continuously generate holes, while the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 of the first electrode 23 will only generate electrons when current passes through, which makes it easier to control the light emission of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 through the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 respectively.

[0083] In some embodiments, the material of the half-pass and half-resistance layer 214 includes P-type doped aluminum gallium nitride.

[0084] P-type doped aluminum gallium nitride has good electron blocking performance and can allow holes to pass smoothly. Therefore, the material of the half-pass and half-blocking layer 214 includes P-type doped aluminum gallium nitride. On the premise of achieving normal light emission of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, it is beneficial to further reduce the risk of mutual interference among the light emission of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213.

[0085] In some embodiments, the material of the half-pass and half-resistance layer 214 includes undoped gallium nitride.

[0086] Undoped gallium nitride has good electron blocking properties and can allow holes to pass smoothly. Therefore, the material of the half-pass and half-blocking layer 214 includes P-type doped aluminum gallium nitride. On the premise of achieving normal light emission of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, it is beneficial to further reduce the risk of mutual interference among the light emission of the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213.

[0087] It is understandable that the material of the half-pass and half-blocking layer 214 may include both P-type doped aluminum gallium nitride and undoped gallium nitride.

[0088] like Figure 3 and Figure 5 As shown, in some embodiments, the light emitting device 20 further includes a particle injection layer 25 , which is disposed between the common electrode layer 22 and the first light emitting layer 211 , and the particle injection layer 25 injects first particles into the light emitting device layer 21 .

[0089] When the common electrode layer 22 is an anode, the particle injection layer 25 is a hole injection layer and can improve the uniformity of hole injection into the first light emitting layer 211 .

[0090] The particle injection layer 25 can be arranged to cover the first light-emitting layer 211. In this way, the particle injection layer 25 can achieve more uniform injection of the first particles into the first light-emitting layer 211 in various regions of the first light-emitting layer 211, and then achieve more uniform injection of the first particles into the second light-emitting layer 212 and the third light-emitting layer 213, so that the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can respectively emit light normally and have the expected light-emitting brightness. When the light-emitting device 20 is applied to the display panel 100, it is beneficial to improve the display effect of the display panel 100.

[0091] In some embodiments, the common electrode layer 22 is an anode, and the material of the particle injection layer 25 includes P-type doped gallium nitride.

[0092] The common electrode layer 22 is an anode, and thus the common electrode layer 22 can generate holes when powered, and the particle injection layer 25 is a hole injection layer.

[0093] The material of the particle injection layer 25 includes P-type doped gallium nitride, which has a higher hole mobility. Therefore, the material of the particle injection layer 25 includes P-type doped gallium nitride, which is beneficial to improving the conductivity of the particle injection layer 25, thereby improving the efficiency of the particle injection layer 25 in injecting holes into the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213.

[0094] like Figure 3 and Figure 6 As shown, in some embodiments, the light-emitting device layer 21 also includes a particle transport layer 215, and the particle transport layer 215 is arranged between the half-pass and half-resistance layer 214 and the first light-emitting layer 211, between the half-pass and half-resistance layer 214 and the second light-emitting layer 212, and on the side of the third light-emitting layer 213 away from the second light-emitting layer 212, and the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 are respectively conductively connected to the particle transport layer 215.

[0095] The particle transport layer 215 allows the first particles and the second particles to pass through, so that the first particles generated by the common electrode layer and the second particles generated by the first electrode can both pass through the particle transport layer 215 .

[0096] The first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 are respectively conductively connected to the particle transport layer 215, so that the second particles generated by the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 can migrate to the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 through the particle transport layer 215.

[0097] In order to reduce the area occupied by the first electrode 23 and increase the light-emitting area of ​​the light-emitting device 20, the projection area of ​​the first electrode 23 on the first light-emitting layer 211 is as small as possible. By setting the particle transport layer 215, when the contact area between the first electrode 23 and the particle transport layer 215 is small, the second particles generated by the first electrode 23 can be quickly diffused into the particle transport layer 215, and migrate to the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 respectively through the corresponding particle transport layer 215.

[0098] The particle transport layer 215 can transport the first particles and the second particles, so the first particles generated by the common electrode layer 22 can pass through the particle transport layer 215 and migrate to the second light-emitting layer 212 and the third light-emitting layer 213 .

[0099] By setting up a particle transfer layer 215, and setting up a first sub-electrode 231, a second sub-electrode 232 and a third sub-electrode 233 to be conductively connected to the particle transfer layer 215 respectively, it is convenient for the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 to transfer second particles to the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 respectively through the particle transfer layer 215, so that there are enough second particles in the first light-emitting layer 211, the second light-emitting layer 212 or the third light-emitting layer 213, so that the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213 can each independently emit light normally.

[0100] In some embodiments, the first electrode 23 is a cathode, and the material of the particle transport layer 215 includes n-type gallium nitride.

[0101] The first electrode 23 is a cathode, and the second particle is an electron. The material of the particle transport layer 215 includes n-type gallium nitride, which can achieve a higher electron mobility of the particle transport layer 215 and allow the holes generated by the common electrode layer 22 to pass normally. This is conducive to achieving the display reliability of the light-emitting device 20.

[0102] like Figure 6 As shown, in some embodiments, the thickness h of the particle transport layer 215 satisfies: 5 nm ≤ h ≤ 50 nm.

[0103] Optionally, h may be 5 nm, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm or 50 nm, etc.

[0104] Optionally, the thickness h of each particle transport layer 215 may be set to satisfy: 5 nm ≤ h ≤ 50 nm.

[0105] In this way, the thickness of the particle transport layer 215 is relatively thin, and the concentration of the n-type doping material in the particle transport layer 215 is relatively low. The holes generated by the common electrode layer 22 will not recombine in large quantities in the particle transport layer 215 during the process of passing through the particle transport layer 215. A sufficient number of holes can pass through the particle transport layer 215 to enter the second light-emitting layer 212 and the second light-emitting layer 213, which is beneficial to the normal light emission of the second light-emitting layer 212 and the third light-emitting layer 213, and further beneficial to the normal light emission of the light-emitting device 20.

[0106] In some embodiments, the common electrode layer 22 is transparent.

[0107] The common electrode layer 22 is transparent, so the light emitted by the light emitting device layer 21 can pass through the common electrode layer 22 and radiate out.

[0108] In this way, the light emitting device layer 21 can emit light from the side close to the common electrode layer 22 , which is beneficial to increase the light emitting area of ​​the light emitting device 20 .

[0109] In some embodiments, the material of the common electrode layer 22 includes fumed tin oxide.

[0110] Smoked tin oxide has good electrical conductivity and high light transmittance, which is beneficial to improving the luminous efficiency of the light-emitting device 20 while achieving the light emission of the light-emitting device 20. It can also achieve the purpose of uniformly injecting holes from the common electrode layer 22 into the light-emitting device layer 21, reduce the risk of uneven distribution of holes in the light-emitting device layer 21, and help improve the display effect of the light-emitting device 20.

[0111] In some embodiments, the wavelength of light emitted by the first light emitting layer 211 is shorter than the wavelength of light emitted by the second light emitting layer 212 , and the wavelength of light emitted by the second light emitting layer 212 is shorter than the wavelength of light emitted by the third light emitting layer 213 .

[0112] In this way, when the light-emitting device 20 emits light from the light-emitting device layer 21 toward the common electrode layer 22, the risk of the shorter wavelength light emitted by the third light-emitting layer 213 exciting the second light-emitting layer 212 and the first light-emitting layer 211 to cause the second light-emitting layer 212 or the third light-emitting layer 213 to emit light is reduced, and the risk of the longer wavelength light emitted by the second light-emitting layer 212 exciting the first light-emitting layer 211 to emit light is reduced, which is beneficial to further reduce the risk of mutual interference among the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213, thereby improving the light-emitting reliability of the light-emitting device 20.

[0113] In some embodiments, the first light-emitting layer 211 , the second light-emitting layer 212 , and the third light-emitting layer 213 are configured to emit one of red light, blue light, and green light, respectively.

[0114] Thus, the first light-emitting layer 211 , the second light-emitting layer 212 , and the third light-emitting layer 213 respectively emit one of red light, blue light, and green light, and the three light-emitting colors are different from each other.

[0115] Red light, blue light and green light are the three primary optical colors, and various colors of light can be produced by mixing the three in different proportions. Therefore, such a configuration is beneficial to improving the diversity of light emission of the light emitting device 20 .

[0116] In some embodiments, the first light-emitting layer 211 is used to emit blue light, the second light-emitting layer 212 is used to emit green light, and the third light-emitting layer 213 is used to emit red light.

[0117] It can be understood that the wavelength of red light is greater than that of green light, and the wavelength of green light is greater than that of blue light. With such a configuration, when the light-emitting device 20 emits light from the side close to the common electrode layer 22, the risk of red light emitted by the third light-emitting layer 213 exciting the second light-emitting layer 212 and the first light-emitting layer 211 to emit light can be reduced, and the risk of green light emitted by the second light-emitting layer 212 exciting the first light-emitting layer 211 to emit light can be reduced, which is beneficial to further reduce the risk of mutual interference among the first light-emitting layer 211, the second light-emitting layer 212 and the third light-emitting layer 213.

[0118] like Figure 7 and Figure 8 As shown, the display panel 100 provided according to the embodiment of the present application includes an array substrate 110 and a plurality of light-emitting devices 20 provided as in any of the above embodiments, the plurality of light-emitting devices 20 are arranged at intervals on the array substrate 110, and the array substrate 110 is electrically connected to the first electrode 23 to drive the light-emitting devices 20 to emit light.

[0119] Optionally, the display panel 100 may be an OLED display panel, or the display panel 100 may be a Micro-LED display panel.

[0120] A pixel driving circuit may be provided inside the array substrate 110. The pixel driving circuit may include thin film transistors. Different thin film transistors are electrically connected to the first sub-electrode 231, the second sub-electrode 232 and the third sub-electrode 233 of the first electrode 23 of the light-emitting device 20 respectively to drive the light-emitting device 20 to emit light.

[0121] Since the light emitting device 20 can emit light through any one or more of the first light emitting layer 211, the second light emitting layer 212 and the third light emitting layer 213, the color of the light emitted by the light emitting device 20 can be adjusted by adjusting the ratio of different color lights, so as to realize multi-color light emission of a single light emitting device 20. In other words, a single light emitting device 20 can realize multi-colorization without arranging monochrome sub-pixels in the display panel 100, which is beneficial to improve the pixel density of the display panel 100, and by arranging the half-pass and half-blocking layer 214 between the first light emitting layer 211 and the second light emitting layer 212 and between the second light emitting layer 212 and the third light emitting layer 213, the risk of mutual interference between the first light emitting layer 211, the second light emitting layer 212 and the third light emitting layer 213 can be reduced, and the risk of display distortion of the display panel 100 can be reduced.

[0122] Optionally, each light emitting device 20 in the display panel 100 may be provided with a common electrode layer 22 alone. Of course, at least two of the plurality of light emitting devices 20 may also share a common electrode layer 22 .

[0123] In some embodiments, at least two light emitting devices 20 share a common electrode layer 22 .

[0124] In this way, the first particles generated by the same common electrode layer 22 when conducting can migrate to a plurality of light-emitting devices 20 .

[0125] Optionally, all light-emitting devices 20 of a display panel 100 may share the same common electrode layer 22. The common electrode layer 22 needs to be electrically connected to the driving components inside the display panel 100. Arranging at least two light-emitting devices 20 to share the common electrode layer 22 is conducive to reducing the number of lines electrically connecting the common electrode layer 22 to the driving components inside the display panel 100, thereby simplifying the line arrangement inside the display panel 100.

[0126] like Fig. 9 As shown, the display device 10 provided according to an embodiment of the present application includes the display panel 100 provided by any of the above embodiments.

[0127] The display device 10 in the embodiment of the present application includes but is not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles and other devices with display functions.

[0128] The display device 10 provided in the embodiment of the present application has the same technical effect as the display panel 100 provided in any of the above embodiments, and thus will not be described in detail herein.

[0129] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A light emitting device, characterized in that: include: A light-emitting device layer, comprising a semi-transmissive and semi-blocking layer and a first light-emitting layer, a second light-emitting layer and a third light-emitting layer stacked in sequence, wherein any two adjacent ones of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer have different light-emitting colors, and the semi-transmissive and semi-blocking layer is arranged between the first light-emitting layer and the second light-emitting layer and between the second light-emitting layer and the third light-emitting layer; A common electrode layer, disposed on a side of the first light-emitting layer away from the second light-emitting layer, the common electrode layer providing first particles to the light-emitting device layer; A first electrode, having a polarity opposite to that of the common electrode, the first electrode providing second particles to the light-emitting device layer, the first electrode comprising a first sub-electrode, a second sub-electrode and a third sub-electrode insulated from each other, the first sub-electrode being conductively connected to the first light-emitting layer, the second sub-electrode being conductively connected to the second light-emitting layer, and the third sub-electrode being conductively connected to the third light-emitting layer; The half-pass and half-blocking layer is configured to allow the first particles to pass through and to block the second particles.

2. The light emitting device according to claim 1, characterized in that: The light-emitting device layer includes a first through hole and a second through hole, the first through hole penetrates the third light-emitting layer and the second light-emitting layer, and the second through hole penetrates the three light-emitting layers; the first sub-electrode is provided in the first through hole and is insulated from the third light-emitting layer and the second light-emitting layer respectively, and the second sub-electrode is provided in the second through hole and is insulated from the third light-emitting layer; Preferably, the light emitting device layer further comprises an insulating layer, wherein the insulating layer is disposed between the inner wall of the first through hole and the first sub-electrode, and between the inner wall of the second through hole and the second sub-electrode; Preferably, the insulating layer is also provided on a side of the light emitting device layer away from the common electrode layer, and is located between any two of the first sub-electrode, the second sub-electrode and the third sub-electrode.

3. The light emitting device according to claim 1, characterized in that: The common electrode layer is an anode, and the first electrode is a cathode; Preferably, the material of the half-through and half-resistance layer includes P-type doped aluminum gallium nitride; and / or the material of the half-through and half-resistance layer includes undoped gallium nitride.

4. The light emitting device according to claim 1, characterized in that: The light emitting device further comprises a particle injection layer, the particle injection layer is arranged between the common electrode layer and the first light emitting layer, and the particle injection layer injects the first particles into the light emitting device layer; Preferably, the common electrode layer is an anode, and the material of the particle injection layer includes P-type doped gallium nitride.

5. The light emitting device according to claim 1, characterized in that: The light-emitting device layer further includes a particle transport layer, which is arranged between the half-pass half-resistance layer and the first light-emitting layer, between the half-pass half-resistance layer and the second light-emitting layer, and on the side of the third light-emitting layer away from the second light-emitting layer, and the first sub-electrode, the second sub-electrode, and the third sub-electrode are respectively conductively connected to the particle transport layer; Preferably, the first electrode is a cathode, and the material of the particle transport layer includes n-type gallium nitride; Preferably, the thickness h of the particle transport layer satisfies: 5nm≤h≤50nm.

6. The light emitting device according to claim 1, characterized in that: The common electrode layer is transparent; Preferably, the material of the common electrode layer includes tin oxide.

7. The light emitting device according to any one of claims 1 to 6, characterized in that: The wavelength of light emitted by the first light-emitting layer is shorter than the wavelength of light emitted by the second light-emitting layer, and the wavelength of light emitted by the second light-emitting layer is shorter than the wavelength of light emitted by the third light-emitting layer; and / or, The first light-emitting layer, the second light-emitting layer and the third light-emitting layer are respectively used to emit one of red light, blue light and green light; Preferably, the first light-emitting layer is used to emit blue light, the second light-emitting layer is used to emit green light, and the third light-emitting layer is used to emit red light.

8. A display panel, characterized in that: include: An array substrate; A plurality of light-emitting devices according to any one of claims 1 to 8 are arranged at intervals on the array substrate, and the array substrate is electrically connected to the first electrode to drive the light-emitting devices to emit light.

9. The display panel according to claim 1, characterized in that: At least two of the light emitting devices share one common electrode layer.

10. A display device, characterized in that: Comprising the display panel as claimed in claim 8 or 9.

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