Display panel and display device

Abstract

The utility model discloses a display panel and a display device, and belongs to the technical field of display. The display panel comprises a driving backboard, a plurality of light emitting devices and a plurality of light reflecting parts. The plurality of light-emitting devices include a plurality of first-type light-emitting devices and a plurality of second-type light-emitting devices. The light reflecting part corresponding to the first type of light-emitting devices is a first light reflecting part, and the light reflecting part corresponding to the second type of light-emitting devices is a second light reflecting part. According to the display panel, the effect of reflecting the light rays transmitted in the direction towards the driving backboard in the light rays emitted by the first type of light-emitting devices by the first light reflecting part is good, the effect of reflecting the light rays transmitted in the direction towards the driving backboard in the light rays emitted by the second type of light-emitting devices by the second light reflecting part is good, and the light emitting efficiency of the display panel is improved. In the wavelength range of the reflected light of each light reflecting part, the phase change of the reflected light reflected by the light reflecting parts is continuous and gentle and does not suddenly change, so that the spectrum of the emergent light of the display panel is prevented from generating miscellaneous peaks, and the display effect of the display panel is relatively good.

Description

TECHNICAL FIELD

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

[0002] Organic light emitting diode (OLED) display panel has the advantages of self-illumination, high efficiency, bright color, thinness, power saving and curling, and is known as the next generation of display devices, and has attracted more and more attention in recent years.

[0003] However, the light extraction efficiency of the current OLED display panel is low, and in order to improve the brightness, the current can only be increased, resulting in high power consumption and low service life of the display device. Utility model content

[0004] The present application provides a display panel and a display device. The technical scheme can solve the problem of low light extraction efficiency of the OLED display panel in the prior art, and is as follows:

[0005] In one aspect, a display panel is provided, comprising: a driving backplate, a plurality of light emitting devices, and a plurality of light reflecting parts.

[0006] The plurality of light emitting devices are distributed on one side of the driving backplate and electrically connected to the driving backplate, and the plurality of light emitting devices include a plurality of first type light emitting devices and a plurality of second type light emitting devices.

[0007] The plurality of light reflecting parts correspond one-to-one to the plurality of light emitting devices, the light reflecting part is located between the corresponding light emitting device and the driving backplate, and the light reflecting part includes a plurality of layers of first inorganic layers and a plurality of layers of second inorganic layers arranged in layers, and the plurality of layers of first inorganic layers and the plurality of layers of second inorganic layers are arranged alternately.

[0008] Among them, the light reflecting part corresponding to the first type light emitting device is a first light reflecting part, and the light reflecting part corresponding to the second type light emitting device is a second light reflecting part; the thickness of the first inorganic layer in the first light reflecting part is different from the thickness of the first inorganic layer in the second light reflecting part, and the thickness of the second inorganic layer in the first light reflecting part is different from the thickness of the second inorganic layer in the second light reflecting part.

[0009] Optionally, the first light reflecting part contacts one side of the driving backplate facing the first type light emitting device, and the second light reflecting part contacts one side of the driving backplate facing the second type light emitting device.

[0010] Optionally, the first reflective part is in contact with a side of the driving back plate facing the first light emitting device; the display panel further comprises a first auxiliary reflective part, the first auxiliary reflective part is located between the second reflective part and the driving back plate, and the first auxiliary reflective part is in contact with a side of the driving back plate facing the second light emitting device.

[0011] Optionally, the first auxiliary reflective part is arranged in the same layer as the first reflective part and is made of the same material.

[0012] Optionally, the plurality of second light emitting devices comprise a plurality of light emitting devices for emitting first color light and a plurality of light emitting devices for emitting second color light.

[0013] The second reflective part corresponding to the light emitting device for emitting the first color light is a first color light reflective part, and the second reflective part corresponding to the light emitting device for emitting the second color light is a second color light reflective part.

[0014] The first color light reflective part and the second color light reflective part are arranged in the same layer and are made of the same material; or the first color light reflective part and the second color light reflective part are arranged in different layers.

[0015] Optionally, when the first color light reflective part and the second color light reflective part are arranged in different layers, the display panel further comprises a second auxiliary reflective part, the second auxiliary reflective part is located between the second color light reflective part and the driving back plate.

[0016] The second auxiliary reflective part is arranged in the same layer as the first color light reflective part and is made of the same material.

[0017] Optionally, the thickness of the first inorganic layer in the first color light reflective part is different from the thickness of the first inorganic layer in the second color light reflective part, and the thickness of the second inorganic layer in the first color light reflective part is different from the thickness of the second inorganic layer in the second color light reflective part.

[0018] Optionally, the first light emitting device is used for emitting red light, the first color light is green light, and the second color light is blue light.

[0019] Optionally, the side of the reflective part away from the driving back plate has a first light coupling-out structure, and the first light coupling-out structure has a plurality of first linear grooves arranged in parallel.

[0020] The structure parameters of the first light coupling-out structure in the first reflective part are different from the structure parameters of the first light coupling-out structure in the second reflective part.

[0021] Optionally, the structure parameters of the first light out-coupling structure include at least one of a center distance between two adjacent first linear grooves, a depth of the first linear grooves, and a duty cycle of the first light out-coupling structure.

[0022] Optionally, the light emitting device includes a first electrode, a light emitting layer, and a second electrode arranged in a stack; the first electrode is electrically connected to the driving backplane.

[0023] Optionally, the first electrode is a light-transmitting electrode, and the second electrode is a semi-transparent and semi-reflective electrode.

[0024] Optionally, the light emitting layer includes at least two sub-light emitting layers and a charge generating layer between two adjacent sub-light emitting layers.

[0025] Optionally, in the same light emitting device, the light emitted by each sub-light emitting layer has the same color.

[0026] Optionally, the sub-light emitting layer includes a hole transport layer, and the sum of the thicknesses of at least two hole transport layers in the light emitting layer is less than 100 nanometers.

[0027] In another aspect, a display panel is provided, including a driving backplane and a plurality of light emitting devices.

[0028] The plurality of light emitting devices are distributed on one side of the driving backplane, and the plurality of light emitting devices include a plurality of first type light emitting devices and a plurality of second type light emitting devices.

[0029] The light emitting device includes a first electrode, a light emitting layer, and a second electrode arranged in a stack; the first electrode is electrically connected to the driving backplane; the first electrode is a light-reflecting electrode, and the second electrode is a light-transmitting electrode; and the light-reflecting electrode has a second light out-coupling structure on the side away from the driving backplane, and the second light out-coupling structure has a plurality of second linear grooves arranged in parallel.

[0030] Optionally, the structure parameters of the second light out-coupling structure in the first type light emitting device are different from the structure parameters of the second light out-coupling structure in the second type light emitting device.

[0031] In yet another aspect, a display device is provided, including a display panel and a driving chip, the display panel being any of the above display panels, and the driving chip being configured to apply a driving signal to the display panel.

[0032] The technical solutions provided by the embodiments of the present application have at least the following beneficial effects:

[0033] The multiple light-emitting devices in this application embodiment may include multiple first-type light-emitting devices and multiple second-type light-emitting devices. The reflective portion corresponding to the first-type light-emitting device is called the first reflective portion, and the reflective portion corresponding to the second-type light-emitting device is called the second reflective portion. The first reflective portion effectively reflects the light emitted from the first-type light-emitting device that travels in the direction toward the driving backplane, while the second reflective portion effectively reflects the light emitted from the second-type light-emitting device that travels in the direction toward the driving backplane, thereby improving the light emission efficiency of the display panel. Furthermore, within the reflected light wavelength range of each reflective portion, the phase change of the reflected light is continuous and gradual, and the phase of the reflected light does not undergo abrupt changes, avoiding spectral clutter in the emitted light of the display panel and resulting in a better display effect. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 It is a graph of the light absorption rate of the first electrode provided by the related technology;

[0036] Figure 2 It is a graph of the reflectivity of the first electrode provided by related technologies;

[0037] Figure 3 This is a schematic diagram of the film layer structure of a display panel provided in an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the film structure of a single reflective part provided in an embodiment of this application;

[0039] Figure 5 This is a graph showing the reflectivity of the second reflective part provided in the embodiments of this application;

[0040] Figure 6 This is a graph showing the phase change of the reflected light from the second reflective part provided in the embodiments of this application;

[0041] Figure 7 This is a schematic diagram of the film structure of a light-emitting device provided in an embodiment of this application;

[0042] Figure 8 This is a schematic diagram of the film layer structure of another display panel provided in an embodiment of this application;

[0043] Figure 9is a schematic diagram of a film layer structure of a display panel provided by another embodiment of the present application;

[0044] Figure 10 is a schematic diagram of a film layer structure of a display panel provided by another embodiment of the present application;

[0045] Figure 11 is a schematic diagram of a film layer structure of a display panel provided by another embodiment of the present application;

[0046] Figure 12 is a schematic diagram of a light path of an optical waveguide in a first electrode of a light-emitting device provided by an embodiment of the present application;

[0047] Figure 13 is a schematic diagram of a structure of a single light-reflecting part provided by an embodiment of the present application;

[0048] Figure 14 is a schematic diagram of a film layer structure of a display panel provided by another embodiment of the present application;

[0049] Figure 15 is Figure 14 a schematic diagram of a structure of a first electrode in a light-emitting device. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0051] In the related art, an OLED display panel can include a driving backplane and a plurality of light-emitting devices on the driving backplane. Each light-emitting device includes a first electrode, a light-emitting layer and a second electrode. The first electrode is electrically connected to the driving backplane. In order to increase the light-emitting efficiency of the display panel, the first electrode can be a metal reflective electrode with light-reflecting property, and the second electrode can use a transparent electrode with light-transmitting property. In this way, the first electrode can reflect light rays emitted by the light-emitting layer in a direction towards the driving backplane, and the reflected light rays can be emitted in a direction away from the driving backplane.

[0052] However, in the case where the first electrode is a metal reflective electrode, the metal reflective electrode will have a certain absorption effect on light rays of a short wavelength band, resulting in poor reflection effect of the metal reflective electrode on light rays of the short wavelength band. For example, please refer to Figure 1 and Figure 2 , Figure 1 is a curve diagram of light absorption rate of the first electrode provided by the related art, Figure 2 is a curve diagram of reflectivity of the first electrode provided by the related art. In the diagram, Figure 1 the abscissa represents the wavelength of light rays emitted by the light-emitting device, and the ordinate represents the light absorption rate of the first electrode, Figure 2The abscissa in the graph represents the wavelength of the light emitted by the light-emitting device, and the ordinate represents the reflectivity of the first electrode. In the wavelength range of 430 nm to 550 nm, the absorption of the metal reflective electrode to the light in this wavelength range is large, for example, when the wavelength of the light emitted by the light-emitting device is in the wavelength range of 430 nm to 550 nm, the absorption of the metal reflective electrode to the light emitted by the light-emitting device is 4% to 10%, resulting in that the reflectivity of the metal reflective electrode to the light emitted by the light-emitting device is small.

[0053] Please refer to Figure 3 , Figure 3 is a film layer structure schematic diagram of a display panel provided by an embodiment of the present application. The display panel 000 includes a driving backboard 100, a plurality of light-emitting devices 200, and a plurality of light-reflecting parts 300.

[0054] The plurality of light-emitting devices 200 in the display panel 000 are distributed on one side of the driving backboard 100 and are electrically connected to the driving backboard 100. The driving backboard 100 can drive the plurality of light-emitting devices 200 to emit light, so that the display panel 000 can display a corresponding picture.

[0055] The plurality of light-emitting devices 200 can include a plurality of first-type light-emitting devices 210 and a plurality of second-type light-emitting devices 220. The wavelengths of the light emitted by the plurality of first-type light-emitting devices 210 are different from the wavelengths of the light emitted by the plurality of second-type light-emitting devices 220. For example, the plurality of first-type light-emitting devices 210 can all be used to emit red light; some of the plurality of second-type light-emitting devices 220 are used to emit green light, and the other second-type light-emitting devices 220 are used to emit blue light.

[0056] The plurality of light-reflecting parts 300 in the display panel 000 correspond to the plurality of light-emitting devices 200 one by one, and the light-reflecting part 300 is located between the corresponding light-emitting device 200 and the driving backboard 100. The plurality of light-reflecting parts 300 are used to reflect the light emitted by the corresponding light-emitting device 200 and transmitted in the direction towards the driving backboard 100, so that the reflected light can be emitted in the direction away from the driving backboard 100, thereby improving the light-emitting efficiency of the display panel 000. In the present application, the light-reflecting part 300 corresponding to the first-type light-emitting device 210 is a first light-reflecting part 310, and the light-reflecting part 300 corresponding to the second-type light-emitting device 220 is a second light-reflecting part 320.

[0057] As shown in Figure 4 , the first light-reflecting part 310 is a metal reflective electrode, and the second light-reflecting part 320 is a dielectric reflective electrode. Figure 4is a schematic diagram of a film layer structure of a single light-reflecting part provided by an embodiment of the present application. The light-reflecting part 300 comprises a plurality of layers of first inorganic layers 301 and a plurality of layers of second inorganic layers 302 arranged in a stack, and the plurality of layers of first inorganic layers 301 and the plurality of layers of second inorganic layers 302 are arranged alternately. That is, one layer of second inorganic layers 302 is distributed between two adjacent layers of first inorganic layers 301, and one layer of first inorganic layers 301 is distributed between two adjacent layers of second inorganic layers 302. In the light-reflecting part 300, one layer of first inorganic layers 301 and one layer of second inorganic layers 302 distributed adjacently together form a light-reflecting layer group 300a. In the same light-reflecting layer group 300a, the first inorganic layers 301 are closer to the driving back plate 100 than the second inorganic layers 302. That is, the light-reflecting part 300 in the display panel 000 can be a distributed Bragg reflector.

[0058] In a possible implementation, the refractive index of the first inorganic layers 301 is smaller than the refractive index of the second inorganic layers 302, and the thickness of the first inorganic layers 301 is greater than the thickness of the second inorganic layers 302. For example, the first inorganic layers 301 in the light-reflecting part 300 can be made of silicon dioxide, and the second inorganic layers 302 in the light-reflecting part 300 can be made of niobium pentoxide.

[0059] It should be noted that, in order to enable the light-reflecting part 300 to have a better reflection effect on specific light, the thickness of the first inorganic layers 301 and the second inorganic layers 302 in the light-reflecting part 300 can be adjusted separately according to the different wavelengths of the light.

[0060] In addition, the wavelengths of the light emitted by the first light-emitting devices 210 are different from the wavelengths of the light emitted by the second light-emitting devices 220. Therefore, the thickness of the first inorganic layers 301 in the first light-reflecting part 310 corresponding to the first light-emitting devices 210 and the thickness of the first inorganic layers 301 in the second light-reflecting part 320 corresponding to the second light-emitting devices 220 need to be set to be different, and the thickness of the second inorganic layers 302 in the first light-reflecting part 310 and the thickness of the second inorganic layers 302 in the second light-reflecting part 320 need to be set to be different.

[0061] It should be noted that the product of the thickness of a single inorganic layer in a distributed Bragg reflector and the refractive index of the inorganic layer is equal to one fourth of the central wavelength.

[0062] For example, the thickness of the single inorganic layer in the first light reflecting part 310 can be calculated by the center wavelength of 590 nm. For example, the thickness of the first inorganic layer 301 in the first light reflecting part 310 can be 100.97 nm, and the thickness of the second inorganic layer 302 in the first light reflecting part 310 can be 64.08 nm, so that the first light reflecting part 310 can reflect the red light emitted by the first light emitting device 210.

[0063] The thickness of the single inorganic layer in the second light reflecting part 320 can be calculated by the center wavelength of 490 nm. For example, the thickness of the first inorganic layer 301 in the second light reflecting part 320 can be 83.49 nm, and the thickness of the second inorganic layer 302 in the second light reflecting part 320 can be 51.82 nm, so that the second light reflecting part 320 can reflect the green light or blue light emitted by the second light emitting device 220.

[0064] In this way, the first light reflecting part 310 can reflect the light emitted by the first light emitting device 210 in the direction of the driving backboard 100, and the second light reflecting part 320 can reflect the light emitted by the second light emitting device 220 in the direction of the driving backboard 100.

[0065] For example, please refer to Figure 5 , Figure 5 is a curve diagram of the reflectivity of the second light reflecting part provided by the embodiment of the present application. Wherein, the abscissa represents the wavelength of the light emitted by the light emitting device 200, and the ordinate represents the reflectivity of the second light reflecting part 320. The second light reflecting part 320 reflects the green light and blue light in the wavelength range of 430 nm to 550 nm, and in this wavelength range, the reflectivity of the second light reflecting part 320 is 100%, and the second light reflecting part 320 reflects the light emitted by the second light emitting device 220 in the direction of the driving backboard 100.

[0066] In this way, the light emitting efficiency of the display panel 000 can be effectively improved, and the brightness of the display panel 000 can be improved without increasing the current, so that the power consumption of the display panel 000 can be reduced, and the service life of the display panel 000 can be improved.

[0067] In addition, since the thickness of the multi-layer first inorganic layer 310 in each light reflecting part 300 is the same and the thickness of the multi-layer second inorganic layer 320 is the same, the phase change of the reflected light reflected by each light reflecting part 300 is continuous and gentle in the reflected light wavelength range of each light reflecting part 300, and the phase of the reflected light does not change suddenly, avoiding the emergence of the spectrum of the display panel 000. The display effect of the display panel 000 is good.

[0068] For example, please refer to Figure 6 , Figure 6 This is a graph showing the phase change of the reflected light from the second reflective part provided in this embodiment. The horizontal axis represents the wavelength of the reflected light, and the vertical axis represents the phase of the reflected light. The second reflective part 320 reflects green and blue light in the 430 nm to 550 nm wavelength range. Within this wavelength range, the phase change of the reflected light is continuous and gradual; the phase of the reflected light does not undergo abrupt changes. That is, within this wavelength range, the phase of the reflected light does not undergo abrupt changes, such as those occurring at a wavelength of 580 nm.

[0069] In summary, the display panel provided in this application includes: a driving backplate, multiple light-emitting devices, and multiple reflective portions. The multiple light-emitting devices may include multiple first-type light-emitting devices and multiple second-type light-emitting devices. The reflective portion corresponding to the first-type light-emitting devices is a first reflective portion, and the reflective portion corresponding to the second-type light-emitting devices is a second reflective portion. The first reflective portion effectively reflects light emitted from the first-type light-emitting devices that travels towards the driving backplate, while the second reflective portion effectively reflects light emitted from the second-type light-emitting devices that travels towards the driving backplate, thereby improving the light extraction efficiency of the display panel. Furthermore, within the wavelength range of the reflected light from each reflective portion, the phase change of the reflected light is continuous and gradual, without abrupt phase changes, avoiding spectral clutter in the emitted light of the display panel and resulting in a better display effect.

[0070] In the embodiments of this application, please refer to Figure 7 , Figure 7 This is a schematic diagram of the film structure of a light-emitting device provided in an embodiment of this application. The light-emitting device 200 in the display panel 000 includes a first electrode 201, a light-emitting layer 202, and a second electrode 203 stacked together, and the first electrode 201 is electrically connected to the driving backplate 100.

[0071] The light emitting device 200 in the display panel 000 and the corresponding light reflecting part 300 can constitute a microcavity structure. In this case, the first electrode 201 is a light-transmitting electrode, and the second electrode 203 is a semi-transparent and semi-reflective electrode. For example, the first electrode 201 can be made of indium tin oxide, and the second electrode 203 can be made of a magnesium-silver alloy. Some of the light emitted by the light emitting layer 202 in the light emitting device 200 and directed towards the second electrode 203 can be transmitted through the second electrode 203 and then emitted, and the other part of the light can be reflected by the second electrode 203. The light reflected by the second electrode 203 and the light emitted by the light emitting layer 202 in the light emitting device 200 and directed towards the first electrode 201 can be transmitted through the first electrode 201 and then directed towards the light reflecting part 300, which can reflect the light towards the second electrode 203. In this way, the light reflected by the reflecting part 300 and the light emitted by the light emitting layer 202 in the light emitting device 200 and directed towards the second electrode 203 can produce a coherent enhanced microcavity effect, thereby improving the light emitting efficiency of the light emitting device 200 and the display effect of the display panel 000. Moreover, since the phase of the reflected light reflected by the light reflecting part 300 is continuous and smooth, the condition for microcavity enhancement can be better matched, thereby further increasing the light emitting efficiency.

[0072] In the embodiments of the present application, the light emitting layer 202 in the light emitting device 200 can include at least two sub-light emitting layers 202a, and the light emitted by each sub-light emitting layer 202a in the same light emitting device 200 has the same color. Through the superposition of the multiple sub-light emitting layers 202a, the charge transport and recombination processes are optimized, and the light emitting efficiency and service life are significantly improved. Each sub-light emitting layer 202a can include a hole injection layer HIL, a hole transport layer HTL, an emitting material layer EML, an electron transport layer ETL, and an electron injection layer EIL.

[0073] In this case, the light emitting layer 202 in the display panel 000 can further include a charge generation layer CGL between two adjacent sub-light emitting layers, for connecting the two adjacent sub-light emitting layers 202a in series, thereby further improving the stability and service life of the light emitting device 200.

[0074] In the case where the light emitting layer 202 in the light emitting device 200 includes one sub-light emitting layer 202a, the thickness of the hole transport layer HTL in the light emitting layer 202 is greater than 100 nanometers. In the case where the light emitting layer 202 in the light emitting device 200 includes multiple sub-light emitting layers 202a, the sum of the thicknesses of the hole transport layers HTL in the sub-light emitting layers 202a is less than 100 nanometers. In the case where the thickness of the hole transport layer HTL is small, the light absorption loss in the hole transport layer HTL can be effectively reduced, thereby further improving the light emitting efficiency of the display panel 000.

[0075] In the embodiment of the present application, the cavity length of the microcavity structure formed by the light emitting device 200 and the corresponding light reflecting part 300 in the display panel 000 is the distance between the second electrode 203 in the light emitting device 200 and the light reflecting part 300 corresponding to the light emitting device 200. Since the cavity length of the microcavity structure is affected by the wavelength of the light emitted by the light emitting device 200, the microcavity structure formed by the light emitting device 200 and the corresponding light reflecting part 300 can produce a coherent enhancement microcavity effect for the light of a specific wavelength emitted by the light emitting device 200 by adjusting the cavity length of the microcavity structure.

[0076] In the case where the wavelength of the light emitted by the first type of light emitting device 210 is different from the wavelength of the light emitted by the second type of light emitting device 210, the cavity lengths of the first type of light emitting device 210 and the second type of light emitting device 220 can be set to be different, so that the cavity length of the microcavity structure is better matched with the wavelength of the light emitted by the light emitting device 200.

[0077] It should be noted that the thickness of the light reflecting layer group 300a in the light reflecting part 300 that contacts the light emitting device 200 can be different from the thickness of the other light reflecting layer groups 300a in the light reflecting part 300, so that the thickness of the light reflecting layer group 300a in the light reflecting part 300 that contacts the light emitting device 200 is adjusted appropriately, and the cavity length of the microcavity structure is better matched.

[0078] In order to make the thickness of the microcavity structure of the first type of light emitting device 210 and the thickness of the microcavity structure of the second type of light emitting device 220 different, so that the cavity length of the microcavity structure of each type of light emitting device 200 is better matched with the wavelength of the light emitted by the light emitting device 200. The plurality of light reflecting parts 300 in the display panel 000 have a plurality of possible design modes to adjust the cavity length of the microcavity structure of each type of light emitting device 200, and the following two possible design modes are taken as examples in the present application:

[0079] In the first possible design mode, as shown in Figure 3 The first light reflecting part 310 in the display panel 000 contacts the side of the driving back plate 100 facing the first type of light emitting device 210, and the second light reflecting part 320 in the display panel 000 contacts the side of the driving back plate 100 facing the second type of light emitting device 220.

[0080] In this case, the cavity length of the microcavity structure of the light emitting device 200 corresponding to the light reflecting part 300 can be adjusted by controlling the number of the light reflecting layer groups 300a in the light reflecting part 300. For example, in the case where the wavelength of the light emitted by the first light emitting device 210 is greater than the wavelength of the light emitted by the second light emitting device 220, the number of the light reflecting layer groups 300a in the first light reflecting part 310 corresponding to the first light emitting device 210 is less than the number of the light reflecting layer groups 300a in the second light reflecting part 320 corresponding to the second light emitting device 220. In this way, the thickness of the first light reflecting part 310 can be less than the thickness of the second light reflecting part 320, so that the thickness of the microcavity structure of the first light emitting device 210 is greater, which can better match the light with longer wavelength emitted by the first light emitting device 210, and the thickness of the microcavity structure of the second light emitting device 220 is smaller, which can better match the light with shorter wavelength emitted by the second light emitting device 220, thereby enhancing the microcavity effect of the display panel 000 and improving the light emitting efficiency of the display panel 000.

[0081] In addition, the number of the light reflecting layer groups 300a in the second light reflecting part 320 is greater, which can effectively improve the reflectivity of the second light reflecting part 320 and further improve the light emitting efficiency of the display panel 000. In this way, the utilization amount of blue light can be increased when displaying the same white screen, thereby reducing the power consumption of the blue light and improving the service life of the device.

[0082] In the second possible design, please refer to Figure 8 , Figure 8 is another film layer structure diagram of a display panel provided by the embodiments of the present application. The first light reflecting part 310 in the display panel 000 is in contact with the side of the driving back plate 100 facing the first light emitting device 210. The display panel 000 further includes a first auxiliary light reflecting part 330, and the first auxiliary light reflecting part 330 is located between the second light reflecting part 320 and the driving back plate 100, and the first auxiliary light reflecting part 330 is in contact with the side of the driving back plate 100 facing the second light emitting device 220.

[0083] In this case, the first auxiliary light-reflecting part 330 in the display panel 000 can be used to adjust the cavity length of the microcavity structure. In the case that the wavelength of the light emitted by the first light-emitting device 210 is greater than the wavelength of the light emitted by the second light-emitting device 220, since the first auxiliary light-reflecting part 330 is located between the second light-reflecting part 320 and the driving backplane 100, the thickness of the microcavity structure of the second light-emitting device 220 is less than the thickness of the microcavity structure of the first light-emitting device 210, and thus the microcavity structure of the second light-emitting device 220 can better match the light of shorter wavelength emitted by the second light-emitting device 220, and the microcavity structure of the first light-emitting device 210 can better match the light of longer wavelength emitted by the first light-emitting device 210, thereby enhancing the microcavity effect of the display panel 000 and improving the light-emitting efficiency of the display panel 000.

[0084] In this application, the first auxiliary light-reflecting part 330 in the display panel 000 can be provided in the same layer as the first light-reflecting part 310 and be made of the same material. That is, the first auxiliary light-reflecting part 330 includes a plurality of layers of first inorganic layers 301 and a plurality of layers of second inorganic layers 302 which are provided in a stack, and the plurality of layers of first inorganic layers 301 and the plurality of layers of second inorganic layers 302 are arranged alternately. The thickness of the first inorganic layer 301 in the first auxiliary light-reflecting part 330 can be the same as the thickness of the first inorganic layer 301 in the first light-reflecting part 310, and the thickness of the second inorganic layer 302 in the first auxiliary light-reflecting part 330 can be the same as the thickness of the second inorganic layer 302 in the first light-reflecting part 310.

[0085] It should be noted that the same layer and the same material of the two structures in this application means that the film layers of the two structures are the same film layer and can be formed at the same time by the same patterning process. For example, each layer of the first inorganic layer 301 in the first auxiliary light-reflecting part 330 and the corresponding layer of the first inorganic layer 301 in the first light-reflecting part 310 are the same inorganic layer, and each layer of the first inorganic layer 301 in the first auxiliary light-reflecting part 330 and the corresponding layer of the first inorganic layer 301 in the first light-reflecting part 310 can be formed at the same time. Similarly, each layer of the second inorganic layer 302 in the first auxiliary light-reflecting part 330 and the corresponding layer of the second inorganic layer 302 in the first light-reflecting part 310 are the same inorganic layer, and each layer of the second inorganic layer 302 in the first auxiliary light-reflecting part 330 and the corresponding layer of the second inorganic layer 302 in the first light-reflecting part 310 can be formed at the same time. In this way, the first auxiliary light-reflecting part 330 and the first light-reflecting part 310 are formed synchronously in the preparation process of the display panel 000.

[0086] In the present application, in the case that the display panel 000 comprises the first auxiliary light-reflecting part 330, since the first auxiliary light-reflecting part 330 and the first light-reflecting part 310 are formed simultaneously, in the process of preparing the first light-reflecting part 310, the first auxiliary light-reflecting part 330 disposed towards the side of the driving back plate of the second light-emitting device 220 can be normally reserved, without using a separate patterning process to make the first auxiliary light-reflecting part 330. Only the patterning process is needed to make the second light-reflecting part 320, so that the preparation process of the display panel 000 can be simplified.

[0087] In the present application, as shown in Figure 9 In the case that the plurality of second light-emitting devices 220 in the display panel 000 can comprise a plurality of light-emitting devices 221 for emitting first color light and a plurality of light-emitting devices 222 for emitting second color light, the second light-reflecting part 320 corresponding to the light-emitting device 221 for emitting first color light is a first color light-reflecting part 321, and the second light-reflecting part 320 corresponding to the light-emitting device 222 for emitting second color light is a second color light-reflecting part 322.

[0088] It should be noted that the first light-emitting device 210 in the display panel 000 can be used to emit red light, the first color light emitted by the light-emitting device 221 can be green light, and the second color light emitted by the light-emitting device 222 can be blue light. Here, the display panel 000 can display corresponding color pictures by controlling the three types of light-emitting devices.

[0089] In this case, the first color light-reflecting part 321 and the second color light-reflecting part 322 in the display panel 000 have a plurality of possible implementation manners, and the present application takes the following two possible implementation manners as examples for illustration:

[0090] The first possible implementation manner, please refer to Figure 9 and Figure 10 , Figure 9 is a schematic diagram of a film layer structure of another display panel provided by an embodiment of the present application, Figure 10 is a schematic diagram of a film layer structure of still another display panel provided by an embodiment of the present application. The first color light-reflecting part 321 and the second color light-reflecting part 322 in the display panel 000 are disposed in the same layer and have the same material. Therefore, in the preparation process of the display panel 000, the first color light-reflecting part 321 and the second color light-reflecting part 322 are formed synchronously, which simplifies the preparation process of the display panel 000.

[0091] Since the refractive index of the first inorganic layer 301 and the refractive index of the second inorganic layer 302 affect the range of the reflected wave band of the light reflecting part 300, in the case where the first color light reflecting part 321 and the second color light reflecting part 322 are arranged in the same layer and are made of the same material in the display panel 000, the first inorganic layer 301 and the second inorganic layer 302 with appropriate refractive indexes need to be selected so that the reflected wave band of the second light reflecting part 320 can cover the wavelength range of the first color light and the second color light.

[0092] For example, the first inorganic layer 301 in the light reflecting part 300 can be made of silicon dioxide, and the second inorganic layer 302 in the light reflecting part 300 can be made of niobium pentoxide. The thickness of the single inorganic layer in the first light reflecting part 310 can be calculated by the center wavelength of 590 nanometers. For example, the thickness of the first inorganic layer 301 in the first light reflecting part 310 can be 100.97 nanometers, and the thickness of the second inorganic layer 302 in the first light reflecting part 310 can be 64.08 nanometers, so that the first light reflecting part 310 can reflect the red light emitted by the first light emitting device 210.

[0093] The thickness of the single inorganic layer in the second light reflecting part 320 can be calculated by the center wavelength of 490 nanometers. For example, the thickness of the first inorganic layer 301 in the second light reflecting part 320 can be 83.49 nanometers, and the thickness of the second inorganic layer 302 in the second light reflecting part 320 can be 51.82 nanometers, so that the second light reflecting part 310 can reflect the green light or the blue light emitted by the second light emitting device 220.

[0094] Here, as shown in FIG. 3, the first color light reflecting part 321 and the second color light reflecting part 322 can be in contact with one side of the driving backboard 100. Alternatively, as shown in FIG. 4, the first color light reflecting part 321 and the second color light reflecting part 322 can be arranged on the side of the first auxiliary light reflecting part 330 away from the driving backboard 100. Figure 9 Figure 10

[0095] The second possible implementation, please refer to FIG. 5, Figure 11 Figure 11 is a film layer structure schematic diagram of a display panel provided by another embodiment of the present application. The first color light reflecting part 321 and the second color light reflecting part 322 in the display panel 000 are arranged in different layers.

[0096] It should be noted that the arrangement of the two structures in different layers in the present application means that the film layers where the two structures are arranged are not the same film layer. For example, the first inorganic layer 301 in the first color light reflecting part 321 and the first inorganic layer 301 in the second color light reflecting part 322 are not the same film layer, and the second inorganic layer 302 in the first color light reflecting part 321 and the second inorganic layer 302 in the second color light reflecting part 322 are not the same film layer.​​​

[0097] It should be further noted that, as shown in FIG. 3, in the case where the first color light reflecting part 321 and the second color light reflecting part 322 in the display panel 000 are arranged in different layers, the display panel 000 can further include a second auxiliary light reflecting part 340. The second auxiliary light reflecting part 340 is located between the second color light reflecting part 322 and the driving back plate 100. Figure 11

[0098] In this case, the second auxiliary light reflecting part 340 in the display panel 000 can be arranged in the same layer and made of the same material as the first color light reflecting part 321. That is, each layer of the first inorganic layer 301 in the second auxiliary light reflecting part 340 is the same inorganic layer as the corresponding layer of the first inorganic layer 301 in the first color light reflecting part 321, and each layer of the first inorganic layer 301 in the second auxiliary light reflecting part 340 and the corresponding layer of the first inorganic layer 301 in the first color light reflecting part 321 can be formed simultaneously. Similarly, each layer of the second inorganic layer 302 in the second auxiliary light reflecting part 340 is the same inorganic layer as the corresponding layer of the second inorganic layer 302 in the first color light reflecting part 321, and each layer of the second inorganic layer 302 in the second auxiliary light reflecting part 340 and the corresponding layer of the second inorganic layer 302 in the first color light reflecting part 321 can be formed simultaneously.

[0099] In this way, in the preparation process of the display panel 000, the second auxiliary light reflecting part 340 and the first color light reflecting part 321 are formed synchronously, so that, in the process of preparing the first color light reflecting part 321, the second auxiliary light reflecting part 340, which is arranged on the side of the driving back plate 100 and through which the second color light is emitted, can be normally reserved, and a separate patterning process is not required to manufacture the second auxiliary light reflecting part 340. Only the second color light reflecting part 322 needs to be manufactured by using the patterning process, so that the preparation process of the display panel 000 can be simplified.

[0100] In the present application, in the case where the first color light reflecting part 321 and the second color light reflecting part 322 in the display panel 000 are arranged in different layers, the thickness of the first inorganic layer 301 in the first color light reflecting part 321 is different from the thickness of the first inorganic layer 301 in the second color light reflecting part 322, and the thickness of the second inorganic layer 302 in the first color light reflecting part 321 is different from the thickness of the second inorganic layer 302 in the second color light reflecting part 322. In this way, the reflection wave band of the first color light reflecting part 321 is different from the reflection wave band of the second color light reflecting part 322.

[0101] ​For example, in the case that the first inorganic layer 301 in the light reflecting part 300 is made of silicon dioxide and the second inorganic layer 302 in the light reflecting part 300 is made of niobium pentoxide, the thickness of the single inorganic layer in the first color light reflecting part 321 can be calculated by the center wavelength of 550 nanometers. For example, the thickness of the first inorganic layer 301 in the first color light reflecting part 321 can be 93.95 nanometers and the thickness of the second inorganic layer 302 in the first color light reflecting part 321 can be 59.23 nanometers, so that the first color light reflecting part 321 can reflect the green light emitted by the second type of light emitting device 221 emitting green light.

[0102] The thickness of the single inorganic layer in the second color light reflecting part 322 can be calculated by the center wavelength of 450 nanometers. For example, the thickness of the first inorganic layer 301 in the second color light reflecting part 322 can be 76.49 nanometers and the thickness of the second inorganic layer 302 in the second color light reflecting part 322 can be 46.72 nanometers, so that the second color light reflecting part 322 can reflect the blue light emitted by the second type of light emitting device 222 emitting blue light.

[0103] In addition, compared with the first color light reflecting part 321 and the second color light reflecting part 322 which are arranged in the same layer and made of the same material, the first color light reflecting part 321 and the second color light reflecting part 322 are arranged in different layers, so that the reflectivity of the first color light reflecting part 321 to the first color light is higher while the reflection wavelength range of the first color light reflecting part 321 covers the wavelength range of the first color light, and the reflectivity of the second color light reflecting part 322 to the second color light is higher while the reflection wavelength range of the second color light reflecting part 322 covers the wavelength range of the second color light, which effectively improves the light emitting efficiency of the display panel 000, and further can improve the brightness of the display panel 000 without increasing the current, so as to reduce the power consumption of the display panel 000 and improve the service life of the display panel 000.

[0104] It should be noted that the second auxiliary light reflecting part 340 in the display panel 000 can be used to adjust the cavity length of the microcavity structure. In the case that the wavelength of the light emitted by the light emitting device 221 emitting the first color light is greater than the wavelength of the light emitted by the light emitting device 222 emitting the second color light, since the second auxiliary light reflecting part 340 is located between the first auxiliary light reflecting part 330 and the second color light reflecting part 322, the cavity length of the microcavity structure of the light emitting device 222 emitting the second color light is smaller than the cavity length of the microcavity structure of the light emitting device 221 emitting the first color light, and further the microcavity structure of the light emitting device 222 emitting the second color light can be better matched with the second color light with shorter wavelength, and the microcavity structure of the light emitting device 221 emitting the first color light can be better matched with the first color light with longer wavelength, which enhances the microcavity effect of the display panel 000 and improves the light emitting efficiency of the display panel 000.

[0105] In the embodiments of the present application, in the display panel 000 shown in Figure 3 , Figure 8 to Figure 11 In the display panel 000 shown in FIG. 1, the first electrode 201 in the light-emitting device 200 is a transparent electrode, and thus light waveguide phenomenon is likely to occur in the first electrode 201, which further causes light loss and reduces the light extraction efficiency of the display panel 000.

[0106] For example, refer to FIG. 2, Figure 12 , Figure 12 FIG. 2 is a schematic diagram of a light path of light waveguide in the first electrode of the light-emitting device provided in the embodiments of the present application. After the light emitted by the light-emitting device 200 enters the first electrode 201, total reflection occurs continuously in the first electrode 201 to form a light waveguide. It should be noted that the condition for forming the light waveguide is that the film layer in which the light waveguide occurs has two optical surfaces, and when the light conducts in the interior of the film layer and satisfies the total reflection condition, total reflection occurs at the two optical surfaces. The total reflection effect of the two optical surfaces causes the light to be confined in the interior of the film layer and to conduct in a certain direction.

[0107] In the present application, refer to FIG. 3, Figure 13 , Figure 13 FIG. 3 is a schematic diagram of the structure of a single light-reflecting part provided in the embodiments of the present application. Here, the first inorganic layer 301 and the second inorganic layer 302 in the light-reflecting part 300 are not drawn in the drawing for better viewing of the drawing. The light-reflecting part 300 in the display panel 000 has a first light out-coupling structure 400 on the side away from the driving backplane 100, and the first light out-coupling structure 400 has a plurality of first linear grooves 401 arranged in parallel.

[0108] Because the light-reflecting part 300 has the first light out-coupling structure 400 on the side away from the driving backplane 100, the surface properties of the contact surface between the first electrode 201 and the light-reflecting layer 300 are destroyed, the light does not form a light waveguide by multiple total reflections in the first electrode 201, and the propagation direction of the light changes. That is, when the light passes through the first electrode 201 and irradiates the contact surface between the first electrode 201 and the light-reflecting layer 300, the light is reflected to the surface on the side of the first electrode 201 away from the driving backplane 100, and the light originally reflected on the surface on the side of the first electrode 201 away from the driving backplane 100 is not reflected but exits from the surface on the side of the first electrode 201 away from the driving backplane 100.

[0109] It should be noted that the first linear grooves 401 in the first light out-coupling structure 400 are periodically arranged on the side of the light-reflecting part 300 away from the driving backboard 100. The first light out-coupling structure 400 can reflect the light emitted by the light-emitting device 200 and transmitted in the direction towards the driving backboard 100, so that the reflected light can be emitted in the direction away from the driving backboard 100, effectively increasing the reflectivity of the light-reflecting part 300, improving the light-emitting efficiency of the display panel 000, and thus improving the brightness of the display panel 000 without increasing the current, thereby reducing the power consumption of the display panel 000 and improving the service life of the display panel 000.

[0110] It should be further noted that the first light out-coupling structure 400 in the light-reflecting part 300 can be a grating. The grating can change the propagation direction of light of different wavelengths according to the grating diffraction principle, so as to reflect light of a specific wavelength. The polarization degree of the light reflected by the grating is high, so that the light transmittance of the display panel 000 is high.

[0111] In this case, since the wavelengths of the light emitted by the first light-emitting device 210 and the second light-emitting device 220 are different, in order to ensure that the reflectivity of the first light out-coupling structure 400 in the first light-reflecting part 310 for reflecting the light emitted by the first light-emitting device 210 is high, and the reflectivity of the first light out-coupling structure 400 in the second light-reflecting part 320 for reflecting the light emitted by the second light-emitting device 220 is high, the structural parameters of the first light out-coupling structure 400 in the first light-reflecting part 310 are different from the structural parameters of the first light out-coupling structure 400 in the second light-reflecting part 320.

[0112] Here, the structural parameters of the first light out-coupling structure 400 can include at least one of the center distance Λ between two adjacent first linear grooves 401, the depth H of the first linear groove 401, and the duty cycle of the first light out-coupling structure 400. It should be noted that at least one of the structural parameters of the first light out-coupling structure 400 can be adjusted to improve the polarization degree of the light emitted by the display panel 000, so that the light transmittance of the display panel 000 is high.

[0113] Here, the center distance Λ refers to the distance between the central axes of two adjacent first linear grooves 401, and the duty cycle refers to the ratio of the width N of the first linear groove 401 to the center distance Λ between two adjacent first linear grooves 401.

[0114] Since the center distance Λ between two adjacent first linear grooves 401 is positively correlated with the wavelength of the light, the reflectivity of the first light out-coupling structure 400 to light of different wavelengths can be controlled by adjusting the center distance Λ between two adjacent first linear grooves 401, so that the first light coupling structure 400 in the first light-reflecting part 310 has a higher reflectivity to the light emitted by the first light-emitting device 210, and the first light coupling structure 400 in the second light-reflecting part 320 has a higher reflectivity to the light emitted by the second light-emitting device 220, thereby improving the light extraction efficiency of the display panel 000.

[0115] In addition, for the first light out-coupling structure 400 to light of different wavelengths, the phase change of the reflected light reflected by each light-reflecting part 300 is continuous and gentle in the wavelength range of the reflected light, and the phase of the reflected light does not change abruptly, avoiding the appearance of spurious peaks in the spectrum of the emitted light of the display panel 000, so that the display effect of the display panel 000 is better. Moreover, in the case of continuous and gentle phase change of the reflected light, the reflected light can better match the conditions of microcavity enhancement, effectively improving the light extraction efficiency of the display panel 000.

[0116] It should be noted that when the plurality of second light-emitting devices 220 include a plurality of light-emitting devices 221 for emitting first color light and a plurality of light-emitting devices 222 for emitting second color light, and the second light-reflecting part 320 corresponding to the light-emitting device 221 emitting the first color light is a first color light-reflecting part 321, and the second light-reflecting part 320 corresponding to the light-emitting device 222 emitting the second color light is a second color light-reflecting part 322, the structure parameters of the first light out-coupling structure 400 in the first color light-reflecting part 321 are different from those of the first light out-coupling structure 400 in the second color light-reflecting part 322. In this way, in the case that the wavelengths of the first color light and the second color light are different, the first light out-coupling structure 400 in the first color light-reflecting part 321 and the first light out-coupling structure 400 in the second color light-reflecting part 322 can reflect light in different wavelength ranges, further improving the light extraction efficiency of the display panel 000.

[0117] In summary, the display panel provided in this application includes: a driving backplate, multiple light-emitting devices, and multiple reflective portions. The multiple light-emitting devices may include multiple first-type light-emitting devices and multiple second-type light-emitting devices. The reflective portion corresponding to the first-type light-emitting devices is a first reflective portion, and the reflective portion corresponding to the second-type light-emitting devices is a second reflective portion. The first reflective portion effectively reflects light emitted from the first-type light-emitting devices that travels towards the driving backplate, while the second reflective portion effectively reflects light emitted from the second-type light-emitting devices that travels towards the driving backplate, thereby improving the light extraction efficiency of the display panel. Furthermore, within the wavelength range of the reflected light from each reflective portion, the phase change of the reflected light is continuous and gradual, without abrupt phase changes, avoiding spectral clutter in the emitted light of the display panel and resulting in a better display effect.

[0118] In the embodiments of this application, please refer to Figure 14 and Figure 15 , Figure 14 This is a schematic diagram of the film layer structure of another display panel provided in another embodiment of this application. Figure 15 yes Figure 14 A schematic diagram of the structure of the first electrode in the light-emitting device. The display panel 000 includes: a driving backplate 100 and multiple light-emitting devices 200.

[0119] The multiple light-emitting devices 200 in the display panel 000 are distributed on one side of the driving back plate 100. The multiple light-emitting devices 200 may include multiple first-type light-emitting devices 210 and multiple second-type light-emitting devices 220.

[0120] The light-emitting device 200 in the display panel 000 may include a first electrode 201, a light-emitting layer 202, and a second electrode 203 stacked together. The first electrode 201 is electrically connected to the driving backplate 100. The first electrode 201 is a reflective electrode, and the second electrode 203 is a light-transmitting electrode. The side of the reflective electrode facing away from the driving backplate 100 has a second light coupling structure 500, and the second light coupling structure 500 has multiple parallel arranged second linear grooves 501.

[0121] It should be noted that the display panel 000 may also include a third electrode 204, and the third electrode 204 is located on the side of the first electrode 201 away from the driving backplate 100. The third electrode 204 may be made of a light-transmitting material. For example, the main material of the third electrode 204 may be indium tin oxide. The third electrode 204 made of indium tin oxide can improve the work function of the first electrode 201 with reflective properties, which is beneficial to improving the electrical performance of the first electrode 201.

[0122] It should be noted that, in the case that the first electrode 201 does not include the second light out-coupling structure 500, the surface of the side of the first electrode 201 facing the third electrode 204 can generate surface plasmon polariton (SPP), and the first electrode 201 can have a light waveguide, and the SPP and the light waveguide can cause light loss and reduce the light out-coupling efficiency of the display panel 000.

[0123] Here, the SPP refers to the interaction between light and free electrons on the surface of a metal due to the high electron content of the metal, which generates electromagnetic waves propagating along the surface of the metal. The SPP can cause loss of light energy, and thus when the light emitted by the light-emitting device 200 is transmitted to the surface of the side of the first electrode 201 facing the third electrode 204, the surface of the first electrode 201 can have SPP, which in turn reduces the light out-coupling efficiency of the display panel.

[0124] Further, after the light emitted by the light-emitting device 200 enters the third electrode 204, the light can continuously undergo total reflection in the third electrode 204 to form a light waveguide. It should be noted that the condition for forming a light waveguide is that the film layer in which the light waveguide is formed has two optical surfaces, and when the light propagates in the film layer and satisfies the total reflection condition, total reflection can occur at the two optical surfaces. The total reflection effect of the two optical surfaces can confine the light in the film layer and propagate in a certain direction.

[0125] In the case that the first electrode 201 includes the second light out-coupling structure 500, the second light out-coupling structure 500 in the first electrode 201 destroys the surface properties of the contact surface of the first electrode 201 and the third electrode 204. When the light emitted by the light-emitting device 200 is incident on the second light out-coupling structure 500, the light can diffract due to scattering and interference, and the diffracted light of a specific wavelength can interact with the SPP to couple energy, retrieve the light energy lost by the interaction between the light emitted by the light-emitting device 200 and the free electrons in the metal, and convert the light energy into light energy.

[0126] Further, since the surface properties of the contact surface of the first electrode 201 and the third electrode 204 are destroyed, the light does not undergo multiple total reflections in the third electrode 204 to form a light waveguide, and the propagation direction of the light changes. That is, when the light passes through the third electrode 204 and is incident on the contact surface of the first electrode 201 and the third electrode 204, the light is reflected to the surface of the third electrode 204 facing away from the driving backplane 100. The light originally reflected on the surface of the third electrode 204 facing away from the driving backplane 100 is not reflected, but is emitted from the surface of the third electrode 204 facing away from the driving backplane 100.

[0127] It should be noted that the second linear grooves 501 in the second light out-coupling structure 500 are periodically arranged on the side of the first electrode 201 away from the driving back plate 100. The second light out-coupling structure 500 can reflect the light emitted by the light emitting device 200 and transmitted in the direction towards the driving back plate 100, so that the reflected light can be emitted in the direction away from the driving back plate 100, effectively increasing the reflectivity of the second light out-coupling structure 500, improving the light out-coupling efficiency of the display panel 000, and thus improving the brightness of the display panel 000 without increasing the current, thereby reducing the power consumption of the display panel 000 and improving the service life of the display panel 000.

[0128] It should be further noted that the second light out-coupling structure 500 in the light emitting device 200 can be a grating. The grating can change the propagation direction of light of different wavelengths according to the grating diffraction principle, so as to reflect light of a specific wavelength. The polarization degree of the light reflected by the grating is high, so that the light transmittance of the display panel 000 is high.

[0129] In this case, since the wavelengths of the light emitted by the first light emitting device 210 and the second light emitting device 220 are different, in order to make the reflectivity of the second light out-coupling structure 500 in the first light emitting device 210 high for reflecting the light emitted by the first light emitting device 210, and the reflectivity of the second light out-coupling structure 500 in the second light emitting device 220 high for reflecting the light emitted by the second light emitting device 220, the structural parameters of the second light out-coupling structure 500 in the first light emitting device 210 are different from those of the second light out-coupling structure 500 in the second light emitting device 220.

[0130] Here, the structural parameters of the second light out-coupling structure 500 can include at least one of the center distance Λ between two adjacent second linear grooves 501, the depth H of the second linear grooves 501, and the duty cycle of the second light out-coupling structure 500. It should be noted that the light polarization degree of the display panel 000 can be improved by adjusting at least one of the structural parameters of the first light out-coupling structure 400, so that the light transmittance of the display panel 000 is high.

[0131] Since the center distance Λ between two adjacent second linear grooves 501 is positively correlated with the wavelength of the light, the reflectivity of the second light out-coupling structure 500 to light of different wavelengths can be controlled by adjusting the center distance Λ between two adjacent second linear grooves 501, so that the second light out-coupling structure 500 in the first light emitting device 210 has a higher reflectivity to the light emitted by the first light emitting device 210, and the second light out-coupling structure 500 in the second light emitting device 220 has a higher reflectivity to the light emitted by the second light emitting device 220, thereby improving the light out-coupling efficiency of the display panel 000.

[0132] In addition, for the second light out-coupling structure 500 for light of different wavelengths, the phase change of the reflected light reflected by each first electrode 201 is continuous and gentle within the wavelength range of the reflected light, and the phase of the reflected light does not change abruptly, avoiding the emergence of a spur in the spectrum of the emitted light of the display panel 000, so that the display effect of the display panel 000 is better.

[0133] It should be noted that in the case where the plurality of second light emitting devices 220 include a plurality of light emitting devices 221 for emitting first color light and a plurality of light emitting devices 222 for emitting second color light, the structural parameters of the second light out-coupling structure 500 in the light emitting device 221 for emitting first color light are different from those of the second light out-coupling structure 500 in the light emitting device 222 for emitting second color light. In this way, in the case where the wavelengths of the first color light and the second color light are different, the second light out-coupling structure 500 in the light emitting device 221 for emitting first color light and the second light out-coupling structure 500 in the light emitting device 222 for emitting second color light can reflect light within different wavelength ranges, further improving the light out-coupling efficiency of the display panel 000.

[0134] In summary, the display panel provided in this application embodiment includes: a driving backplate and multiple light-emitting devices. The multiple light-emitting devices may include multiple first-type light-emitting devices and multiple second-type light-emitting devices. Each light-emitting device may include a first electrode, a light-emitting layer, and a second electrode stacked together. The side of the first electrode facing away from the driving backplate has a second light-coupled structure, and the second light-coupled structure has multiple parallel-arranged second linear grooves. The second light-coupled structure can reduce the SPP generated in the first electrode and can improve the reflectivity of the first electrode, thereby increasing the light extraction efficiency of the display panel. Furthermore, the wavelengths of light emitted by the first type of light-emitting device and the multiple second type of light-emitting devices are different. The structural parameters of the second optical coupling structure in the first type of light-emitting device and the second optical coupling structure in the second type of light-emitting device are different. This results in the second optical coupling structure in the first type of light-emitting device having a higher reflectivity for the light emitted by the first type of light-emitting device, and the second optical coupling structure in the second type of light-emitting device having a higher reflectivity for the light emitted by the second type of light-emitting device. Moreover, for the second optical coupling structure for different wavelengths of light, the phase change of the reflected light reflected by each first electrode is continuous and smooth within the wavelength range of the reflected light. The phase of the reflected light will not change abruptly, thus avoiding the appearance of spurious peaks in the spectrum of the emitted light of the display panel, resulting in a better display effect of the display panel.

[0135] This application also provides a display device, which may include a display panel and a driver chip. The display panel is the aforementioned display panel, and the driver chip is used to apply a driving signal to the display panel. The display device can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0136] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0137] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0138] The above merely provides the optional embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that, include: Drive backplate, multiple light-emitting devices and multiple reflectors; The plurality of light-emitting devices are distributed on one side of the driving backplate and electrically connected to the driving backplate. The plurality of light-emitting devices include a plurality of first-type light-emitting devices and a plurality of second-type light-emitting devices. Each of the multiple reflective portions corresponds one-to-one with a multiple of the multiple light-emitting devices. The reflective portion is located between the corresponding light-emitting device and the driving backplate. The reflective portion includes multiple layers of first inorganic layer and multiple layers of second inorganic layer stacked together. The multiple layers of first inorganic layer and multiple layers of second inorganic layer are arranged alternately. Wherein, the reflective part corresponding to the first type of light-emitting device is the first reflective part, and the reflective part corresponding to the second type of light-emitting device is the second reflective part; the thickness of the first inorganic layer in the first reflective part is different from the thickness of the first inorganic layer in the second reflective part, and the thickness of the second inorganic layer in the first reflective part is different from the thickness of the second inorganic layer in the second reflective part.

2. The display panel according to claim 1, characterized in that, The first reflective part contacts the side of the driving back plate facing the first type of light-emitting device, and the second reflective part contacts the side of the driving back plate facing the second type of light-emitting device.

3. The display panel according to claim 1, characterized in that, The first reflective part contacts the side of the driving back plate facing the first type of light-emitting device; the display panel further includes: a first auxiliary reflective part, the first auxiliary reflective part being located between the second reflective part and the driving back plate, and the first auxiliary reflective part contacting the side of the driving back plate facing the second type of light-emitting device.

4. The display panel according to claim 3, characterized in that, The first auxiliary reflective part is disposed in the same layer as the first reflective part and is made of the same material.

5. The display panel according to any one of claims 1-4, characterized in that, The plurality of second-type light-emitting devices include: a plurality of light-emitting devices for emitting first-color light, and a plurality of light-emitting devices for emitting second-color light; Wherein, the second reflective part corresponding to the light-emitting device for emitting the first color light is the first color light reflective part, and the second reflective part corresponding to the light-emitting device for emitting the second color light is the second color light reflective part; The first color light reflective part and the second color light reflective part are disposed in the same layer and are made of the same material; or, the first color light reflective part and the second color light reflective part are disposed in different layers.

6. The display panel according to claim 5, characterized in that, When the first color light reflector and the second color light reflector are disposed in different layers, the display panel further includes: a second auxiliary reflector, which is located between the second color light reflector and the driving back plate; The second auxiliary reflective part is disposed in the same layer as the first color light reflective part and is made of the same material.

7. The display panel according to claim 6, characterized in that, The thickness of the first inorganic layer in the first color light reflective part is different from the thickness of the first inorganic layer in the second color light reflective part, and the thickness of the second inorganic layer in the first color light reflective part is different from the thickness of the second inorganic layer in the second color light reflective part.

8. The display panel according to claim 6 or 7, characterized in that, The first type of light-emitting device is used to emit red light, the first color light is green light, and the second color light is blue light.

9. The display panel according to any one of claims 1-4 and 6-7, characterized in that, The reflective part has a first light coupling structure on the side away from the drive back plate, and the first light coupling structure has multiple parallel first linear grooves. The structural parameters of the first light-coupled structure in the first reflective part are different from those of the first light-coupled structure in the second reflective part.

10. The display panel according to claim 9, characterized in that, The structural parameters of the first optical coupling structure include at least one of the following: the center distance between two adjacent first linear grooves, the depth of the first linear groove, and the duty cycle of the first optical coupling structure.

11. The display panel according to any one of claims 1-4, 6-7, and 10, characterized in that, The light-emitting device includes a first electrode, a light-emitting layer, and a second electrode stacked together; the first electrode is electrically connected to the driving backplate. The first electrode is a light-transmitting electrode, and the second electrode is a semi-transmitting and semi-reflective electrode.

12. The display panel according to claim 11, characterized in that, The light-emitting layer includes at least two sub-light-emitting layers and a charge-generating layer located between two adjacent sub-light-emitting layers; In the same light-emitting device, the light emitted by each of the sub-light-emitting layers is of the same color.

13. The display panel according to claim 12, characterized in that, The sub-light-emitting layer includes a hole transport layer, and the sum of the thicknesses of at least two hole transport layers in the light-emitting layer is less than 100 nanometers.

14. A display panel, characterized in that, include: Driven backplane and multiple light-emitting devices; The plurality of light-emitting devices are distributed on one side of the driving backplate, and the plurality of light-emitting devices include a plurality of first-type light-emitting devices and a plurality of second-type light-emitting devices; The light-emitting device includes a first electrode, a light-emitting layer, and a second electrode stacked together; the first electrode is electrically connected to the driving backplate. The first electrode is a reflective electrode, and the second electrode is a light-transmitting electrode; and the side of the reflective electrode facing away from the driving back plate has a second light coupling structure, and the second light coupling structure has multiple parallel arranged second linear grooves; The structural parameters of the second optical coupling structure in the first type of light-emitting device are different from those of the second optical coupling structure in the second type of light-emitting device.

15. A display device, characterized in that, include: The display panel is the display panel according to any one of claims 1 to 14, and the driving chip is used to apply a driving signal to the display panel.

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