Display panel and display device

Abstract

The invention relates to the technical field of display panels, in particular to a display panel and a display device.The display panel comprises a substrate and a light-emitting layer, the light-emitting layer is arranged on one side of the substrate and comprises a light-emitting element, and the light-emitting element comprises a first electrode, a light-emitting material layer and a second electrode which are sequentially arranged in a stacked mode in the direction away from the substrate; the first electrode comprises a reflecting layer and a transmittance adjustable layer which are sequentially arranged in the direction away from the substrate, and the light transmittance of the transmittance adjustable layer is adjustable. The color cast problem of the display panel can be improved, and the display effect of the display panel is improved.

Description

Technical Field

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

[0002] Organic Light Emitting Display (OLED) and flat-panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] However, the quality of current OLED display products needs to be improved. Summary of the invention

[0004] In view of this, the main technical problem to be solved by the present application is to provide a display panel and a display device to improve the color cast problem of the display panel and enhance the display effect of the display panel.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a display panel, wherein the display panel includes a substrate and a light-emitting layer, wherein the light-emitting layer is arranged on one side of the substrate, and includes a light-emitting element, wherein the light-emitting element includes a first electrode, a light-emitting material layer and a second electrode stacked in sequence in a direction away from the substrate, wherein the first electrode includes a reflective layer and a transmittance adjustable layer arranged in sequence in a direction away from the substrate, wherein the light transmittance of the transmittance adjustable layer is adjustable.

[0006] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide a display device, comprising any one of the display panels mentioned above.

[0007] The beneficial effect is as follows: Different from the prior art, the present application provides a display panel, which includes a substrate, a light-emitting layer, the light-emitting layer is arranged on one side of the substrate, and includes a light-emitting element, the light-emitting element includes a first electrode, a light-emitting material layer and a second electrode stacked in sequence in a direction away from the substrate, wherein the first electrode includes a reflective layer and a transmittance-adjustable layer arranged in sequence in a direction away from the substrate, wherein the light transmittance of the transmittance-adjustable layer is adjustable. The present application adds a layer of transmittance-adjustable layer in the first electrode of the light-emitting element, and the light transmittance of the transmittance-adjustable layer is adjustable. When the display panel has a color cast problem, the light reflected by the reflective layer can be adjusted by adjusting the light transmittance of the transmittance-adjustable layer, thereby reducing the light color efficiency of the color cast, and finally improving the color cast problem of the display panel and improving the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0009] Figure 1 is a schematic cross-sectional structure diagram of an embodiment of a display panel of the present application;

[0010] Figure 2 In one embodiment Figure 1 A schematic diagram of the structure of the substrate and the light-emitting element;

[0011] Figure 3 In another embodiment Figure 1 A schematic diagram of the structure of the substrate and the light-emitting element;

[0012] Figure 4 In another embodiment Figure 1 A schematic diagram of the structure of the substrate and the light-emitting element;

[0013] Figure 5 In another embodiment Figure 1 A schematic diagram of the structure of the substrate and the light-emitting element;

[0014] Figure 6 In another embodiment Figure 1 A schematic diagram of the structure of the substrate and the light-emitting element;

[0015] Figure 7 In another embodiment Figure 1 A schematic diagram of the structure of the substrate and the light-emitting element;

[0016] Figure 8 In one embodiment Figure 6 A schematic diagram of the top view of the structure of the medium reflection layer and the transmittance adjustable layer;

[0017] Fig. 9 In another embodiment Figure 6 A schematic diagram of the top view of the structure of the medium reflection layer and the transmittance adjustable layer;

[0018] Fig.10 is a schematic cross-sectional structure diagram of another embodiment of the display panel of the present application;

[0019] Fig.11 It is a schematic cross-sectional structure diagram of another embodiment of the display panel of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] It should be noted that the terms "first" and "second" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0022] In one embodiment of the present application, Figure 1 and Figure 2 The display panel 10 includes a substrate 100 and a light emitting layer 200 .

[0023] The substrate 100 plays a supporting role in the display panel 10, and can be a flexible substrate or a rigid substrate. When the substrate 100 is a flexible substrate, its material can be polyimide (PI), and when the substrate 100 is a rigid substrate, its material can be glass or metal. The present application does not limit the structure of the substrate 100.

[0024] The light-emitting layer 200 is arranged on one side of the substrate 100, and the light-emitting layer 200 can emit light by itself. The light-emitting layer 200 includes a light-emitting element 210, which is a top-emitting device with a strong microcavity effect. Among them, the light-emitting element 210 includes a first electrode 211, a light-emitting material layer 212 and a second electrode 213 stacked in sequence in a direction away from the substrate 100, and the light-emitting material layer 212 is sandwiched between the first electrode 211 and the second electrode 213. The light-emitting material layer 212 includes an organic light-emitting material. After applying a voltage to the first electrode 211 and the second electrode 213, the light-emitting material layer 212 emits light. Among them, the number of light-emitting elements 210 can be one or more. When the number of light-emitting elements 210 is more than one, the light-emitting color of some light-emitting elements 210 is red, the light-emitting color of some light-emitting elements 210 is green, and the light-emitting color of some light-emitting elements 210 is blue. It should be noted that the color of the light emitted by the light-emitting element 210 is not limited to red, green, and blue, but can also be yellow or other colors, which are not limited here.

[0025] Among them, an array layer 300 is also arranged between the substrate 100 and the light-emitting layer 200, and the array layer 300 includes a pixel driving circuit 310, and the pixel driving circuit 310 includes a transistor 311 and a capacitor 312. The transistor 311 includes a semiconductor part, a gate, a source and a drain. The capacitor 312 includes a first plate and a second plate. The pixel driving circuit 310 can be, for example, a 2T1C circuit, a 7T1C circuit, a 7T2C circuit or a 9T1C circuit, and the present application does not limit its specific structure. Among them, the "2T1C circuit" refers to a pixel circuit including 2 thin film transistors (T) and 1 capacitor (C) in the pixel circuit, and other "7T1C circuits", "7T2C circuits", "9T1C circuits" and so on are deduced accordingly.

[0026] Among them, the light-emitting layer 200 further includes an encapsulation layer 400 on the side facing away from the substrate 100, and the encapsulation layer 400 is used to encapsulate the light-emitting layer 200, which is beneficial to prevent the external moisture and oxygen from affecting the light-emitting layer 200. The encapsulation layer 400 includes a plurality of inorganic encapsulation film layers and at least one organic encapsulation film layer stacked, and the at least one organic encapsulation film layer is arranged between the plurality of inorganic encapsulation film layers, and the plurality of inorganic encapsulation films form a closed space that seals the organic encapsulation film layer. It should be understood that the inorganic encapsulation film layer can minimize or completely prevent the penetration of moisture, oxygen and / or hydrogen into the array layer 300 and the light-emitting layer 200. Therefore, as an embodiment, the inorganic encapsulation film layer and the organic encapsulation film layer can be alternately stacked, and the inorganic encapsulation film layer can be set as the top and bottom layers of the encapsulation unit, and the outermost inorganic encapsulation film layer can completely cover the organic encapsulation film layer, thereby forming a barrier space that can block the entry of water and oxygen.

[0027] See also Figure 3In one embodiment, the first electrode 211 includes a reflective layer 2111 and a transmittance adjustable layer 2112 which are sequentially arranged in a direction away from the substrate 100 , wherein the light transmittance of the transmittance adjustable layer 2112 is adjustable.

[0028] Specifically, the reflective layer 2111 is made of a conductive material that can conduct electricity. At the same time, the reflective layer 2111 can reflect light while acting as an electrode. The light transmittance of the adjustable transmittance layer 2112 is adjustable. The lower the light transmittance of the adjustable transmittance layer 2112, the less light passes through the adjustable transmittance layer 2112. Therefore, by adjusting the light transmittance of the adjustable transmittance layer 2112, the light reflected by the reflective layer 2111 can be adjusted. Therefore, when the display panel 10 has a color cast problem, the light reflected by the reflective layer 2111 can be adjusted by adjusting the light transmittance of the adjustable transmittance layer 2112, thereby reducing the light color efficiency of the color cast, and ultimately improving the color cast problem of the display panel 10 and improving the display effect of the display panel 10.

[0029] In one embodiment of the present application, the light transmittance of the adjustable transmittance layer 2112 is related to the temperature of the light emitting element 210, that is, the light transmittance of the adjustable transmittance layer 2112 changes with the temperature of the light emitting element 210. Specifically, considering that the color shift problem of the display panel 10 is usually related to the temperature of the light emitting element 210, it is set that the light transmittance of the adjustable transmittance layer 2112 changes with the temperature of the light emitting element 210, so as to improve the color shift problem of the display panel 10 caused by temperature.

[0030] In one embodiment of the present application, taking into account that the display panel 10 usually has a color shift problem in a high temperature environment, and the higher the temperature, the more serious the color shift, the light transmittance of the adjustable transmittance layer 2112 is set to be negatively correlated with the temperature of the light-emitting element 210, that is, as the temperature of the light-emitting element 210 increases, the light transmittance of the adjustable transmittance layer 2112 decreases, thereby reducing the light reflected by the reflective layer 2111, thereby reducing the efficiency of the cast light color, and ultimately improving the color shift problem of the display panel 10.

[0031] It is understandable that if in other embodiments, the display panel 10 is more likely to have a color shift problem as the temperature decreases, and the lower the temperature, the more serious the color shift problem. In this case, the light transmittance of the adjustable transmittance layer 2112 can be set to be positively correlated with the temperature of the light-emitting element 210, that is, as the temperature of the light-emitting element 210 decreases, the light transmittance of the adjustable transmittance layer 2112 will decrease.

[0032] In another embodiment, when the temperature of the light emitting element 210 is greater than the temperature threshold, the light transmittance of the transmittance adjustable layer 2112 is negatively correlated with the temperature of the light emitting element 210, and when the temperature of the light emitting element 210 is less than or equal to the temperature threshold, the light transmittance of the transmittance adjustable layer 2112 remains unchanged. That is, only when the temperature is greater than a certain temperature threshold, the light transmittance of the transmittance adjustable layer 2112 will decrease with the increase of the temperature of the light emitting element 210. Specifically, this setting is mainly to take into account that the display panel 10 will have a color shift problem when the temperature threshold is exceeded, so it is set that when the temperature is greater than a certain temperature threshold, the light transmittance of the transmittance adjustable layer 2112 will decrease with the increase of the temperature of the light emitting element 210, and when the temperature is less than or equal to the temperature threshold, the light transmittance of the transmittance adjustable layer 2112 remains unchanged, that is, when the temperature of the light emitting element 210 is less than or equal to the temperature threshold, the light transmittance of the transmittance adjustable layer 2112 is independent of the temperature of the light emitting element 210.

[0033] The temperature threshold may be preset, for example, 30° C., 40° C. or 50° C., etc.

[0034] In one embodiment, when the temperature is greater than 30° C., the light transmittance of the transmittance-adjustable layer 2112 and the temperature of the light-emitting element 210 satisfy the following relationship:

[0035] Y=(-X+125) / 100, where Y is the light transmittance of the transmittance adjustable layer 2112, and X is the temperature of the light emitting element 210. For example, when the temperature of the light emitting element 210 is 40°C, the light transmittance of the transmittance adjustable layer 2112 is 85%; when the temperature of the light emitting element 210 is 50°C, the light transmittance of the transmittance adjustable layer 2112 is 75%; when the temperature of the light emitting element 210 is 60°C, the light transmittance of the transmittance adjustable layer 2112 is 65%.

[0036] In one embodiment, the light transmittance of the transmittance-adjustable layer 2112 varies in the range of 60%-90%, that is, the transmittance-adjustable layer 2112 varies within the range of 60%-90%.

[0037] In one embodiment, the material of the transmittance adjustable layer 2112 includes a thermochromic material, which is a material whose color changes with temperature, thereby changing the light transmittance. In this embodiment, as the temperature of the light emitting element 210 changes, the color of the transmittance adjustable layer 2112 automatically changes, that is, the light transmittance of the transmittance adjustable layer 2112 automatically changes, so that the light reflected by the reflective layer 2111 can be automatically adjusted, thereby improving the color deviation problem of the display panel 10.

[0038] In one embodiment, the thermochromic material includes at least one of spiro rings, polyaromatic rings containing CH=CH, and triphenylmethanes. It should be noted that the present application does not specifically limit the thermochromic material, as long as the color of the thermochromic material can change with temperature.

[0039] In one embodiment, the material of the transmittance adjustable layer 2112 includes an electrochromic material, which is a material whose color changes with the change of voltage, thereby changing the light transmittance. Figure 3 In this embodiment, the first electrode 211 further includes a first auxiliary electrode layer 2113 and a second auxiliary electrode layer 2114, wherein the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 are used to apply a voltage to the transmittance adjustable layer 2112, thereby changing the light transmittance of the transmittance adjustable layer 2112. Specifically, when the display panel 10 has no color shift problem, the potentials of the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 are equal, so that there will be no pressure difference on both sides of the adjustable transmittance layer 2112, and the color of the electrochromic material in the adjustable transmittance layer 2112 will not change, so that the light transmittance of the adjustable transmittance layer 2112 will not change. When the display panel 10 has a color shift problem, the potentials of the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 are not equal, so that there is a pressure difference on both sides of the adjustable transmittance layer 2112, the color of the electrochromic material in the adjustable transmittance layer 2112 changes, and the light transmittance of the adjustable transmittance layer 2112 changes, thereby improving the color shift problem of the display panel 10.

[0040] See also Figure 3 In one embodiment, in the direction away from the substrate 100, the first auxiliary electrode layer 2113, the transmittance adjustable layer 2112 and the second auxiliary electrode layer 2114 are stacked in sequence, that is, the transmittance adjustable layer 2112 is sandwiched between the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114, so that the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 can provide voltage to the transmittance adjustable layer 2112. In other embodiments, the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 can be spaced apart on both sides of the transmittance adjustable layer 2112 in a direction parallel to the substrate 100. In this case, the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 can also apply voltage to the transmittance adjustable layer 2112, so that a voltage difference is generated on both sides of the transmittance adjustable layer 2112.

[0041] Continue reading Figure 3In one embodiment, the display panel 10 further includes a first wiring 201 and a second wiring 202, the first wiring 201 is electrically connected to the first auxiliary electrode layer 2113, the second wiring 202 is electrically connected to the second auxiliary electrode layer 2114, the first wiring 201 and the second wiring 202 transmit voltage signals to the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 respectively, so that the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 apply voltage to the adjustable transmittance layer 2112. In other words, the light transmittance of the adjustable transmittance layer 2112 can be adjusted by the voltage signals transmitted by the first wiring 201 and the second wiring 202.

[0042] In one embodiment, the electrochromic material includes at least one of tungsten trioxide, molybdenum oxide, tetrathiafulvalene, nickel-based perovskite oxide, polythiophene and its derivatives, viologens, and metal phthalocyanine compounds. It should be noted that the present application does not specifically limit the electrochromic material, as long as the color of the electrochromic material can change with the change of voltage.

[0043] In one embodiment of the present application, the display panel 10 further includes a temperature sensor (not shown) and a control unit (not shown). The temperature sensor is used to detect the temperature of the light-emitting element 210; the control unit electrically connects the temperature sensor to the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114, and is used to adjust the voltage applied by the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 on the transmittance adjustable layer 2112 according to the temperature detected by the temperature sensor, so as to control the light transmittance of the electrochromic material. Specifically, when the temperature of the light-emitting element 210 changes, the temperature sensor can detect the temperature change in time, so that the control unit can adjust the voltage applied by the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 on the transmittance adjustable layer 2112 in time according to the problem detected by the temperature sensor, so as to control the light transmittance of the electrochromic material. In one embodiment, the first wiring 201, the second wiring 202, and the temperature sensor are all electrically connected to the control component. The control component adjusts the voltage signals on the first wiring 201 and the second wiring 202 according to the temperature detected by the temperature sensor, thereby adjusting the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 to apply voltage on the transmittance adjustable layer 2112.

[0044] In one embodiment, when the temperature sensor detects that the temperature of the light-emitting element 210 is less than or equal to a temperature threshold (for example, 30°C), the control unit controls the potentials of the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 to be equal; when the temperature sensor detects that the temperature of the light-emitting element 210 is greater than the temperature threshold, the control unit controls the potentials of the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 to be unequal. Specifically, when the temperature of the light-emitting element 210 is less than or equal to the temperature threshold, it is determined that the display panel 10 will not have a color deviation problem. At this time, there is no need to change the light transmittance of the adjustable transmittance layer 2112, and then the potentials applied to the adjustable transmittance layer 2112 by the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 are controlled to be equal, and no pressure difference is generated on both sides of the adjustable transmittance layer 2112, and the light transmittance of the adjustable transmittance layer 2112 remains unchanged; when the temperature of the light-emitting element 210 is greater than the temperature threshold, it is determined that the display panel 10 has a color deviation problem, and the light transmittance of the adjustable transmittance layer 2112 needs to be changed, and then the potentials applied to the adjustable transmittance layer 2112 by the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114 are controlled to be unequal, and a pressure difference is generated on both sides of the adjustable transmittance layer 2112, and finally the light transmittance of the adjustable transmittance layer 2112 changes.

[0045] In another embodiment, the control element may include a transistor and a driving chip. The transistor can control the opening and closing of the circuit. Therefore, the transistor can be used to control whether to apply voltage to the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114. Therefore, when the display panel 10 has no color temperature problem, the transistor can be turned off and no voltage is applied to the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114. When the display panel 10 has a color deviation problem, the transistor is turned on to apply voltage to the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114. At the same time, the driving chip can control the magnitude of the voltage applied to the first auxiliary electrode layer 2113 and the second auxiliary electrode layer 2114.

[0046] See also Figure 4 In one embodiment, the first electrode 211 further includes a first work function adjustment layer 2115 and a second work function adjustment layer 2116. In a direction away from the substrate 100, the first work function adjustment layer 2115, the reflective layer 2111, the transmittance adjustable layer 2112, and the second work function adjustment layer 2116 are sequentially stacked, and the first work function adjustment layer 2115 and the second work function adjustment layer 2116 can adjust the work function of the first electrode 211. The first work function adjustment layer 2115 and the second work function adjustment layer 2116 are both made of conductive materials.

[0047] Continue reading Figure 4In one embodiment of the present application, the reflective layer 2111 is reused as the first auxiliary electrode layer 2113, and the second work function adjustment layer 2116 is reused as the second auxiliary electrode layer 2114, that is, the reflective layer 2111 is the first auxiliary electrode layer 2113, and the second work function adjustment layer 2116 is the second auxiliary electrode layer 2114, so that a voltage is applied to the transmittance adjustable layer 2112 through the reflective layer 2111 and the second work function adjustment layer 2116. In this solution, the reflective layer 2111 is directly used as the first auxiliary electrode layer 2113, and the second work function adjustment layer 2116 is used as the second auxiliary electrode layer 2114, so that the thickness of the display panel 10 can be reduced, and the product can be made thinner and lighter. In this embodiment, the reflective layer 2111 is electrically connected to the first wiring 201, and the second work function adjustment layer 2116 is electrically connected to the second wiring 202, so that the first wiring 201 and the second wiring 202 transmit voltage signals to the reflective layer 2111 and the second work function adjustment layer 2116 respectively, thereby enabling the reflective layer 2111 and the second work function adjustment layer 2116 to apply voltage to the transmittance adjustable layer 2112.

[0048] Continue reading Figure 4 ,exist Figure 4 In the implementation manner, assuming that the first electrode 211 is an anode and the second electrode 213 is a cathode, when the display panel 10 has no color deviation problem, the potential of the second work function adjustment layer 2116, the potential of the reflective layer 2111, and the potential of the first work function adjustment layer 2115 are all equal (the potential range of the three can be 3V to 4V at this time), and are all greater than the potential of the second electrode 213 (the potential range of the second electrode 213 can be -3V to -2V at this time). At this time, a voltage difference is formed between the second work function adjustment layer 2116 and the second electrode 213, so that the light-emitting material layer 212 emits light, and there is no voltage difference between the potential of the second work function adjustment layer 2116 and the reflective layer 2111, and the light transmittance of the adjustable transmittance layer 2112 does not change;

[0049] When the display panel 10 has a color deviation problem, in order to allow the luminescent material layer 212 to emit light normally without being affected, the voltage difference on both sides of the luminescent material layer 212 is maintained unchanged, and the potential of the second electrode 213 and the second work function adjustment layer 2116 is maintained unchanged. In order to change the light transmittance of the adjustable transmittance layer 2112 to improve the color deviation problem, the potential of the reflective layer 2111 and the first work function adjustment layer 2115 is reduced (the potential of the reflective layer 2111 and the first work function adjustment layer 2115 can be reduced to 0V~4V, and of course, the potential of the reflective layer 2111 and the first work function adjustment layer 2115 can also be increased). At this time, a pressure difference is generated on both sides of the adjustable transmittance layer 2112, and the light transmittance of the adjustable transmittance layer 2112 changes. That is to say, when improving the color deviation problem, the potential of the reflective layer 2111 and the first work function adjustment layer 2115 is dynamically adjustable. In other embodiments, the reflective layer 2111 may not be reused as the first auxiliary electrode layer 2113, and the second work function adjustment layer 2116 may not be reused as the second auxiliary electrode layer 2114. That is to say, in other embodiments, the reflective layer 2111 and the first auxiliary electrode layer 2113 are two independent film layers, and the second work function adjustment layer 2116 and the second auxiliary electrode layer 2114 are also two independent film layers.

[0050] In one embodiment, the first work function adjustment layer 2115 and the second work function adjustment layer 2116 are made of the same material, both including indium tin oxide (ITO). Indium tin oxide helps to achieve effective injection of electrons from the transmittance adjustable layer 2112 to the first work function adjustment layer 2115 and the second work function adjustment layer 2116. In other embodiments, the materials of the first work function adjustment layer 2115 and the second work function adjustment layer 2116 may also be different.

[0051] See also Figure 5 In another embodiment, in the direction away from the substrate 100, the first work function adjustment layer 2115, the reflective layer 2111, the transmittance adjustable layer 2112, and the second work function adjustment layer 2116 are stacked in sequence. Figure 4 The difference between the embodiments is that the material of the transmittance adjustable layer 2112 includes a thermochromic material, and the light transmittance of the transmittance adjustable layer 2112 changes automatically with the temperature of the light emitting element 210 , so there is no need to set the first wiring 201 and the second wiring 202 .

[0052] like Figure 6 and Figure 7In one embodiment of the present application, the transmittance adjustable layer 2112 is a patterned structure and is provided with a hollow area 2117, that is, during the preparation process, the transmittance adjustable layer 2112 can be prepared by a patterned process, so that part of the transmittance adjustable layer 2112 is hollowed out. Specifically, the existence of the transmittance adjustable layer 2112 will also affect the light output of the display panel 10 to a certain extent. Therefore, compared with the transmittance adjustable layer 2112 being a whole-surface continuous model, the setting of the hollow area 2117 can improve the light transmittance performance of the display panel 10.

[0053] In order to take into account both the light transmittance of the display panel 10 and the adjustable light transmittance of the adjustable transmittance layer 2112, the hollow area of ​​the hollow region 2117 is set not to exceed 50% of the area of ​​the first surface of the adjustable transmittance layer 2112, wherein the first surface is the surface of the adjustable transmittance layer 2112 parallel to the substrate 100, that is, during the preparation process, after obtaining a continuous entire surface of the adjustable transmittance layer 2112, an area not exceeding 50% of the adjustable transmittance layer 2112 is hollowed out.

[0054] Continue reading Figure 6 as well as Figure 7 In order to ensure the flatness and overall strength of the display panel 10, the hollow area 2117 is also filled with an insulating material. In one embodiment, the insulating material includes an inorganic material. In one embodiment, the material filled in the hollow area 2117 includes silicon dioxide. Since silicon dioxide has a high transmittance, this setting can ensure the light transmission performance of the display panel 10.

[0055] like Figure 8 and Fig. 9 , the hollow area 2117 includes a plurality of hollow sub-areas 2118, wherein Figure 8 In the embodiment, multiple hollow sub-areas 2118 are connected, and in Fig. 9 In the figure, the multiple hollow sub-areas 2118 are not connected to each other.

[0056] In one embodiment, the light-emitting element 210 is a red light-emitting element, a green light-emitting element or a blue light-emitting element. Each light-emitting element 210 may also include a hole injection layer, a hole transport layer, an electron transport layer and an electron injection layer stacked in sequence from the first electrode 211 to the second electrode 213. In the display panel 10, the high-temperature stability of the blue light-emitting element is poorer than that of the red light-emitting element and the green light-emitting element, and the high-temperature life is short. In order to weaken the optical microcavity of the red light-emitting element and the green light-emitting element, reduce the output light of the red light-emitting element and the green light-emitting element, and improve the color shift problem of the display panel 10, it is necessary to set a transmittance adjustable layer 2112 in the red light-emitting element and the green light-emitting element. When the temperature is greater than 30°C, adjust the chromaticity of the output light of the red light-emitting element and the green light-emitting element, thereby improving the color shift problem of the display panel 10.

[0057] See also Fig.10 In one embodiment, the number of the light-emitting elements 210 is multiple, and among the multiple light-emitting elements 210, some of the light-emitting elements 210 include the transmittance adjustable layer 2112, while some of the light-emitting elements 210 do not include the transmittance adjustable layer 2112. For example, the multiple light-emitting elements 210 include a light-emitting element 20 with a blue light-emitting color, a light-emitting element 21 with a red light-emitting color, and a light-emitting element 22 with a green light-emitting color. The light-emitting element 20 with a blue light-emitting color does not include the transmittance adjustable layer 2112, and the light-emitting element 21 with a red light-emitting color and the light-emitting element 22 with a green light-emitting color both include the transmittance adjustable layer 2112. At the same time, Fig.10 In an embodiment, the material of the transmittance adjustable layer 2112 includes an electrochromic material. In the light emitting element 21 with a red luminous color and the light emitting element 22 with a green luminous color, the reflective layer 2111 is electrically connected to the first wiring 201, and the second work function adjustment layer 2116 is electrically connected to the second wiring 202, so that the first wiring 201 and the second wiring 202 transmit voltage signals to the reflective layer 2111 and the second work function adjustment layer 2116 respectively, so that the reflective layer 2111 and the second work function adjustment layer 2116 apply voltage to the transmittance adjustable layer 2112.

[0058] Continue reading Fig.10 In one embodiment, the display panel 10 further includes a planarization layer 500 and a pixel definition layer 600 which are sequentially stacked in a direction away from the substrate 100, the planarization layer 500 is provided with a groove, the first electrode 211 of the light-emitting element 200 is provided in the groove of the planarization layer 500, the pixel definition layer 600 is provided with a pixel opening, and the light-emitting material layer 212 and the second electrode 213 of the light-emitting element 200 are formed in the pixel opening. The orthographic projection of the groove on the planarization layer 500 on the substrate 100 covers the orthographic projection of the pixel opening on the substrate 100. It should be noted that, in other embodiments, the light-emitting elements 200 may all be formed on the planarization layer 500, for example, the first electrode 211 is formed between the planarization layer 500 and the pixel definition layer 600 and is partially exposed in the pixel opening of the pixel definition layer 600, and the light-emitting material layer 212 and the second electrode 213 are formed in the pixel opening.

[0059] See also Fig.11 ,and Fig.10 The difference between the implementation modes is that the material of the transmittance adjustable layer 2112 includes a thermochromic material, and the first wiring 201 and the second wiring 202 are not required.

[0060] In one embodiment, the first electrode 211 is an anode, and the second electrode 213 is a cathode. In other embodiments, the first electrode 211 may be a cathode, and the second electrode 213 may be an anode.

[0061] In one embodiment, the material of the reflective layer 2111 includes silver, which has strong chemical stability and extremely high light reflectivity. In other embodiments, the material of the reflective layer 2111 may also include aluminum or polyethylene.

[0062] The present application also protects a display device, including any of the above display panels 10. The display device includes a display panel 10, which has the same structure as the display panel 10 in any of the above embodiments, and the details can be found in the above related content, which will not be repeated here.

[0063] The display device can be any device with a display function, such as a notebook, a desktop computer, a tablet computer, a mobile phone, a smart watch, etc., and is not limited here.

[0064] The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that: The display panel comprises: substrate; The light-emitting layer is arranged on one side of the substrate, and includes a light-emitting element, wherein the light-emitting element includes a first electrode, a light-emitting material layer and a second electrode which are stacked in sequence in a direction away from the substrate, wherein the first electrode includes a reflective layer and a transmittance adjustable layer which are arranged in sequence in a direction away from the substrate, wherein the light transmittance of the transmittance adjustable layer is adjustable.

2. The display panel according to claim 1, characterized in that: The light transmittance of the transmittance-adjustable layer is related to the temperature of the light-emitting element; Preferably, when the temperature of the light-emitting element is greater than a temperature threshold, the light transmittance of the transmittance-adjustable layer is negatively correlated with the temperature of the light-emitting element; When the temperature of the light-emitting element is less than or equal to a temperature threshold, the light transmittance of the transmittance-adjustable layer remains unchanged; Preferably, when the temperature of the light-emitting element is greater than a temperature threshold, the light transmittance of the transmittance-adjustable layer and the temperature of the light-emitting element satisfy the following relationship: Y=(-X+125) / 100, wherein Y is the light transmittance of the transmittance adjustable layer, and X is the temperature of the light emitting element.

3. The display panel according to claim 1, characterized in that: The material of the transmittance adjustable layer includes a thermochromic material; Preferably, the thermochromic material comprises at least one of spirocyclic rings, polyaromatic rings containing CH=CH, and triphenylmethane.

4. The display panel according to claim 1, characterized in that: The material of the transmittance adjustable layer includes an electrochromic material, and the first electrode further includes a first auxiliary electrode layer and a second auxiliary electrode layer, wherein the first auxiliary electrode layer and the second auxiliary electrode layer are used to apply a voltage to the transmittance adjustable layer; Preferably, in a direction away from the substrate, the first auxiliary electrode layer, the transmittance adjustable layer and the second auxiliary electrode layer are stacked in sequence; Preferably, the display panel further comprises a first wiring electrically connected to the first auxiliary electrode layer and a second wiring electrically connected to the second auxiliary electrode layer, and the first wiring and the second wiring transmit voltage signals to the first auxiliary electrode layer and the second auxiliary electrode layer respectively; Preferably, the electrochromic material includes at least one of tungsten trioxide, molybdenum oxide, tetrathiafulvalene, nickel-based perovskite oxides, polythiophenes and their derivatives, viologens, and metal phthalocyanine compounds.

5. The display panel according to claim 4, characterized in that: The display panel further comprises: A temperature sensor, used to detect the temperature of the light emitting element; a control element, electrically connecting the temperature sensor with the first auxiliary electrode and the second auxiliary electrode, and used for adjusting the voltage applied by the first auxiliary electrode and the second auxiliary electrode on the transmittance adjustable layer according to the temperature detected by the temperature sensor, so as to control the light transmittance of the electrochromic material; Preferably, when the temperature sensor detects that the temperature of the light-emitting element is less than or equal to a temperature threshold, the control component controls the potentials of the first auxiliary electrode layer and the second auxiliary electrode layer to be equal; and when the temperature sensor detects that the temperature of the light-emitting element is greater than the temperature threshold, the control component controls the potentials of the first auxiliary electrode layer and the second auxiliary electrode layer to be unequal; Preferably, the control element includes a transistor and a driving chip.

6. The display panel according to claim 4, characterized in that: The first electrode further includes a first work function adjustment layer and a second work function adjustment layer, and in a direction away from the substrate, the first work function adjustment layer, the reflective layer, the transmittance adjustable layer, and the second work function adjustment layer are stacked in sequence; wherein the reflective layer is multiplexed as the first auxiliary electrode layer, and the second work function adjustment layer is multiplexed as the second auxiliary electrode layer; Preferably, when the temperature of the light-emitting element is less than or equal to a temperature threshold, the potentials of the reflective layer and the second work function adjustment layer are equal; and when the temperature of the light-emitting element is greater than the temperature threshold, the potentials of the reflective layer and the second work function adjustment layer are unequal; Preferably, the material of the first work function regulating layer / the second work function regulating layer includes indium tin oxide.

7. The display panel according to claim 1, characterized in that: The transmittance adjustable layer is in a patterned structure and is provided with a hollow area; preferably, the hollow area includes a plurality of hollow sub-areas, and the plurality of hollow sub-areas are connected, or the plurality of hollow sub-areas are not connected to each other; Preferably, the hollow area of ​​the hollow region does not exceed 50% of the area of ​​the first surface of the adjustable transmittance layer, wherein the first surface is a surface of the adjustable transmittance layer parallel to the substrate.

8. The display panel according to claim 7, characterized in that: The hollow area is filled with an insulating material; preferably, the insulating material comprises an inorganic material; Preferably, the insulating material comprises silicon dioxide.

9. The display panel according to claim 1, characterized in that: The first electrode is an anode, and the second electrode is a cathode; The material of the reflective layer includes silver.

10. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 9.

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