Pixel driving circuit, pixel driving method, and display apparatus

Abstract

A driving circuit (200), a display panel (100), and a display apparatus (500). The display panel (100) comprises: a driving substrate (1), which comprises a driving circuit layer (10); an anode electrode layer (2), which is arranged on one side of the driving circuit layer (10) and is electrically connected to the driving circuit layer (10); an organic light-emitting layer (3), which is arranged on the side of the anode electrode layer (2) away from the driving circuit layer (10) and comprises a plurality of light-emitting units (30); a cathode electrode layer (4), which is arranged on the side of the organic light-emitting layer (3) away from the driving circuit layer (200) and is electrically connected to the driving circuit layer (200); a phase change structure layer (5), which is arranged between the anode electrode layer (2) and the driving circuit layer (10) and comprises a plurality of phase change units (50) arranged corresponding to the plurality of light emitting units (30), wherein each phase change unit (50) comprises a phase change material (51) having a first state and a second state, and a driving element (52) electrically connected to the driving circuit layer (10) and configured to drive the phase change material (51) to be in the first state or the second state; and a first light absorption layer (6), which is arranged on the side of the phase change material (51) close to the driving circuit layer (10). The display panel (100) can effectively reduce the thickness thereof, reduce power consumption, and improve the light-emitting efficiency and contrast ratio of the display panel (100).

Description

Pixel driving circuit, driving method and display device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023106896341 filed on June 12, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of display technology, and in particular to a driving circuit, a display panel, and a display device. Background Art

[0004] OLED (Organic Light-Emitting Diode) devices have a self-luminous structure and have the advantages of high contrast, wide viewing angle, fast response speed, and are light, thin and foldable. They are currently one of the main research directions in the display field.

[0005] Because OLEDs rely on their own light, it's desirable to absorb as much ambient light as possible to prevent reflections that could interfere with normal colors and cause color mixing. Therefore, OLED displays typically utilize circular polarizers. These are composed of a polarizer and a quarter-wave plate, which absorb ambient light. However, due to their thickness, the thickness of the display panel cannot be reduced, necessitating the use of a new technology to replace these filters.

[0006] Summary of the Invention

[0007] The present application provides a driving circuit, a display panel, and a display device, which mainly solve the problem that the thickness of the display panel cannot be reduced.

[0008] In order to solve the above technical problems, a technical solution adopted in the present application is to provide a display panel, including a driving substrate, including a driving circuit layer;

[0009] an anode electrode layer, disposed on one side of the driving circuit layer and electrically connected to the driving circuit layer;

[0010] an organic light-emitting layer, disposed on a side of the anode electrode layer away from the driving circuit layer, and comprising a plurality of light-emitting units;

[0011] a cathode electrode layer, disposed on a side of the organic light-emitting layer away from the driving circuit layer and electrically connected to the driving circuit layer;

[0012] It also includes a phase change structure layer, which is arranged between the anode electrode layer and the driving circuit layer; the phase change structure layer includes a plurality of phase change units arranged corresponding to the plurality of light-emitting units, and the phase change units include:

[0013] a phase change material having a first state and a second state;

[0014] a driving element, electrically connected to the driving circuit layer, and configured to drive the phase change material to be in the first state or the second state;

[0015] a first light absorbing layer, disposed on a side of the phase change material close to the driving circuit layer;

[0016] The phase change material is light-transmissive in the first state, so that the first light-absorbing layer absorbs ambient light from the outside; and the phase change material is light-reflective in the second state, which is the same color as the light emitted by the corresponding light-emitting unit.

[0017] The phase change material is cholesteric liquid crystal; the driving element includes a first driving electrode and a second driving electrode; the first driving electrode and the second driving electrode are respectively arranged on opposite sides of the cholesteric liquid crystal for applying a driving voltage to the cholesteric liquid crystal.

[0018] The cholesteric liquid crystal is configured to be able to change from a first state to a second state under the driving voltage, and to be able to restore from the second state to the first state after the driving voltage disappears.

[0019] In which, the phase change unit also includes a packaging cavity, which has a accommodating cavity; the phase change material is arranged in the accommodating cavity; the first driving electrode is arranged on the side of the packaging cavity close to the driving circuit layer, and the second driving electrode is arranged on the side of the packaging cavity close to the anode electrode layer.

[0020] The multiple packaging cavities of the multiple phase change units are interconnected to form a packaging layer, the packaging layer has a plurality of first conductive through holes spaced apart from the accommodating cavities, and the anode electrode layer is electrically connected to the driving circuit layer through the first conductive through holes.

[0021] wherein the plurality of second driving electrodes of the plurality of phase change units are connected to each other and electrically connected to the cathode electrode layer; the plurality of first driving electrodes of the plurality of phase change units are respectively electrically connected to the driving circuit layer; or

[0022] The multiple first driving electrodes of the multiple phase change units are connected to each other and electrically connected to the cathode electrode layer; the multiple second driving electrodes of the multiple phase change units are respectively electrically connected to the driving circuit layer through the second conductive through-holes of the packaging layer.

[0023] The display panel further comprises a second light absorbing layer arranged on the phase change structure layer away from the driving circuit layer; the second light absorbing layer comprises a plurality of light absorbing units, and the light absorbing units are arranged at positions corresponding to positions between two adjacent phase change units.

[0024] Wherein, the anode electrode layer is a transparent electrode layer.

[0025] To solve the above technical problems, another technical solution adopted in the present application is to provide a driving circuit for driving any of the above-mentioned display panels, comprising:

[0026] A judging module, configured to judge the state of the display panel;

[0027] a driving module, configured to drive the phase change unit according to a determination result of the determination module;

[0028] In response to the display panel being in a non-display state, the driving module drives the phase change material to be in the first state through the driving element; in response to the display panel being in a display state, the driving module drives the phase change material to be in the second state through the driving element.

[0029] To solve the above technical problems, another technical solution adopted by the present application is to provide a display device, comprising:

[0030] A display panel, comprising any of the above-mentioned display panels;

[0031] The driving circuit includes the driving circuit mentioned above.

[0032] The present application provides a driving circuit, a display panel, and a display device. The display panel includes a driving substrate, an anode electrode layer, an organic light-emitting layer, a cathode electrode layer, and a phase change structure layer. The driving substrate includes a driving circuit layer; the anode electrode layer is disposed on one side of the driving circuit layer and is electrically connected to the driving circuit layer; the organic light-emitting layer is disposed on a side of the anode electrode layer away from the driving circuit layer and includes a plurality of light-emitting units; the cathode electrode layer is disposed on a side of the organic light-emitting layer away from the driving circuit layer and is electrically connected to the driving circuit layer; the phase change structure layer is disposed between the anode electrode layer and the driving circuit layer; the phase change structure layer includes a plurality of phase change units disposed corresponding to the plurality of light-emitting units, the phase change units including a phase change material having a first state and a second state, a first light-absorbing layer disposed on a side of the phase change material close to the driving circuit layer, and a driving element electrically connected to the driving circuit layer; the driving element is configured to drive the phase change material to the first state or the second state. The display panel is provided with a phase change structure layer including a phase change material and a driving element, so that the phase change material is light-transmissive in a first state, the first light-absorbing layer absorbs ambient light from the outside, and can reflect light of the same color as the emitted light of the corresponding light-emitting unit in a second state; such a setting not only reduces the influence of ambient light on the display panel, but also enhances the light emitted by the organic light-emitting layer, thereby improving the luminous efficiency and contrast of the display panel; at the same time, compared with the display panel of the prior art that absorbs ambient light from the outside through a polarizer, the display panel adopts a phase change structure layer with a smaller thickness and omits a thicker polarizer, thereby effectively reducing its own thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] FIG1 is a schematic structural diagram of a display panel provided in one embodiment of the present application;

[0035] FIG2 is a schematic diagram of a display panel provided by the present application absorbing ambient light in a first state;

[0036] FIG3 is a schematic diagram of a display panel provided by the present application reflecting ambient light in a second state;

[0037] FIG4 is a schematic diagram of a specific structure of a phase change structure layer provided in one embodiment of the present application;

[0038] FIG5 is a schematic diagram of a specific structure of a phase change structure layer provided in another embodiment of the present application;

[0039] FIG6 is a schematic structural diagram of a display panel provided in another embodiment of the present application;

[0040] FIG7 is a schematic diagram of electrode connection according to an embodiment of the present application;

[0041] FIG8 is a schematic diagram of electrode connection provided by another embodiment of the present application;

[0042] FIG9 is a schematic structural diagram of a driving circuit provided in one embodiment of the present application;

[0043] FIG10 is a schematic structural diagram of a display device provided in an embodiment of the present application.

[0044] Explanation of the accompanying drawings: 1-driving substrate; 10-driving circuit layer; 11-substrate; 2-anode electrode layer; 3-organic light-emitting layer; 30-light-emitting unit; 4-cathode electrode layer; 5-phase change structure layer; 50-phase change unit; 51-phase change material; 52-driving element; 52a-first driving electrode; 52b-second driving electrode; 53-packaging cavity; 53a-accommodating cavity; 6-first light-absorbing layer; 7-second light-absorbing layer; 70-light-absorbing unit; 100-display panel; 200-driving circuit; 300-judgment module; 400-driving module; 500-display device; A-first conductive through hole; B-packaging layer. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0047] The terms "first," "second," and "third" in this application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications also change accordingly. In addition, the terms "including" and "having," as well as any variations thereof, 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 may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0048] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] In the prior art, OLED (Organic Light-Emitting Diode) display devices are self-luminous structures. When the OLED self-luminesces, external natural light will also illuminate the OLED display panel. After penetrating the encapsulation layer, it will be reflected back from the metal cathode. Therefore, the reflected light from the cathode will cause significant imaging interference, reduce the display contrast, and cause interference to the user when reading. The dark state is not dark, so the OLED display device needs to use a circular polarizer to solve this problem. The circular polarizer is an assembly composed of a linear polarizer and a 1 / 4 wave plate. The external natural light passes through a linear polarizing film and a 1 / 4 phase delay plate, and is converted into linear polarized light and circular polarized light in turn; after being reflected by the OLED metal cathode, it becomes circularly polarized light with the opposite rotation direction; after passing through the 1 / 4 phase delay film, it becomes linear polarized light with a vibration direction perpendicular to the polarization direction of the linear polarizing film; the linear polarized light cannot pass through, thereby suppressing the reflection interference of external ambient light.

[0050] However, since the thickness of the circular polarizer is relatively large (usually around 100 μm), the thickness of the display panel cannot be reduced.

[0051] The present application provides a drive circuit, a display panel, and a display device. The display panel comprises a phase-change structure layer including a phase-change material, a drive element, and a first light-absorbing layer. The phase-change material is light-transmissive in a first state, allowing the first light-absorbing layer to absorb ambient light from the outside, thereby reducing the impact of ambient light on the display panel. In a second state, the phase-change material is light-reflective, allowing the first light-absorbing layer to absorb ambient light from the outside, thereby reducing the impact of ambient light on the display panel. In a second state, the phase-change material is light-reflective, reflecting light of the same color as the light emitted by the corresponding light-emitting unit. This configuration not only reduces the impact of ambient light on the display panel but also enhances the light emitted by the organic light-emitting layer, thereby improving the luminous efficiency and contrast of the display panel. Furthermore, compared to conventional display panels that absorb ambient light through polarizers, this display panel utilizes a thinner phase-change structure layer and eliminates the thicker polarizers, thereby effectively reducing the thickness of the display panel and the display device.

[0052] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0053] Please refer to Figure 1, which is a schematic diagram of the structure of a display panel provided in an embodiment of the present application. In this embodiment, the present application provides a display panel 100, which includes a drive substrate 1, an anode electrode layer 2, an organic light-emitting layer 3, a cathode electrode layer 4, and a phase change structure layer 5.

[0054] The drive substrate 1 includes a drive circuit layer 10. An anode electrode layer 2 is disposed on one side of the drive circuit layer 10 and is electrically connected to the drive circuit layer 10. The anode electrode layer 2 is disposed between the organic light-emitting layer 3 and the phase change structure layer 5, and is electrically connected to the drive circuit layer 10 via a first conductive via A. The drive substrate 1 also includes a substrate 11, such as a PI flexible substrate, on which the drive circuit layer 10 is disposed. The drive circuit layer 10 includes thin-film transistors (TFTs), data lines, power lines, and the like.

[0055] Specifically, the anode electrode layer 2 is a transparent or semi-transparent electrode layer, allowing light to at least partially pass through the anode electrode layer 2. Preferably, in a specific embodiment, the anode electrode layer 2 is an ITO (Indium Tin Oxide) layer or other transparent conductive material layer. Furthermore, since the anode electrode layer 2 of the present application can be made of a transparent conductive material layer and does not need to have a reflective function, conductive materials containing Ag can be omitted, effectively reducing production costs.

[0056] The organic light-emitting layer 3 is disposed on the side of the anode electrode layer 2 away from the driving circuit layer 10. The organic light-emitting layer 3 also includes a plurality of light-emitting units 30. In a specific embodiment, the plurality of light-emitting units 30 include red light-emitting units, green light-emitting units, and blue light-emitting units. In this embodiment, the organic light-emitting layer 3 includes a hole injection layer (HIL), a hole transport layer (HTL), a light-emitting material layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) stacked in sequence.

[0057] The cathode electrode layer 4 is disposed on a side of the organic light-emitting layer 3 away from the drive circuit layer 10 and is electrically connected to the drive circuit layer 10. Specifically, the cathode electrode layer 4 is electrically connected to the drive circuit layer 10 via the edge of the display panel 100. The cathode electrode layer 4 can be a single layer or can be disposed separately for each of the multiple light-emitting units 30.

[0058] Continuing with Figure 1 , the phase-change structure layer 5 is disposed between the anode electrode layer 2 and the drive circuit layer 10 . The phase-change structure layer 5 includes a plurality of phase-change units 50 corresponding to the plurality of light-emitting units 30 . The phase-change units 50 include a phase-change material 51 having a first state and a second state, a driving element 52 electrically connected to the drive circuit layer 10 , and a first light-absorbing layer 6 disposed on the side of the phase-change material 51 proximal to the drive circuit layer 10 . In a specific embodiment, the driving element 52 is used to drive the phase-change material 51 between the first state and the second state. The specific material of the phase-change material 51 is not limited, as long as it can switch between the first state and the second state. For example, it can be liquid crystal. The structure of the driving element 52 is not limited, as long as it can drive the phase-change material 51 to switch between the first state and the second state. The driving element 52 can drive the phase-change material 51 between the first state and the second state using an electric field, a magnetic field, heating, light, or other methods. In a specific embodiment, the first light-absorbing layer 6 is a black material.

[0059] Referring to Figures 1, 2, and 3, Figure 2 is a schematic diagram of the display panel provided by the present application absorbing ambient light in a first state. Figure 3 is a schematic diagram of the display panel provided by the present application reflecting ambient light in a second state. In the first state, the phase change material 51 is light-transmissive, allowing the first light-absorbing layer 6 to absorb ambient light from the outside, thereby reducing the impact of the ambient light on the display panel 100. In the second state, the phase change material 51 is capable of reflecting light of the same color as the light emitted by the corresponding light-emitting unit 30 (including ambient light from the outside and light emitted by the light-emitting unit 30 toward the phase change material 51), thereby further enhancing the light emitted by the multiple light-emitting units 30 of the organic light-emitting layer 3, thereby improving the luminous efficiency and contrast of the display panel 100. For example, if the phase change unit 50 corresponds to a light-emitting unit 30 that can emit red light, the phase change material 51 can reflect red light in the second state; if the phase change unit 50 corresponds to a light-emitting unit 30 that can emit green light, the phase change material 51 can reflect green light in the second state. Specifically, the multiple phase change units 50 include a phase change unit 50 for reflecting red light, a phase change unit 50 for reflecting green light, and a phase change unit 50 for reflecting blue light, which correspond to the red light emitting unit, the green light emitting unit, and the blue light emitting unit, respectively.

[0060] Please refer to Figure 4, which is a schematic diagram of the specific structure of the phase change structure layer provided in one embodiment of the present application. In this embodiment, the phase change material 51 is a cholesteric liquid crystal. The driving element 52 includes a first driving electrode 52a and a second driving electrode 52b. The first driving electrode 52a and the second driving electrode 52b are respectively disposed on opposite sides of the cholesteric liquid crystal and are used to apply a driving voltage to the cholesteric liquid crystal. The first driving electrode 52a is disposed on the side of the phase change material 51 closest to the driving circuit layer 10, and the second driving electrode 52b is disposed on the side of the phase change material 51 closest to the anode electrode layer 2. In other words, the first driving electrode 52a and the second driving electrode 52b are respectively disposed on two sides of the phase change material 51 perpendicular to the phase change structure layer 5. In specific embodiments, the cholesteric liquid crystal can be made of either a thermochromic material or a liquid crystal material. It is understood that in other embodiments, depending on the liquid crystal material used in the phase change material 51, the first driving electrode 52a and the second driving electrode 52b can also be disposed on two sides of the phase change material 51 parallel to the phase change structure layer 5. As shown in Figure 5, Figure 5 is a schematic diagram of the specific structure of the phase change structure layer provided in another embodiment of the present application. In this embodiment, the first drive electrode 52a and the second drive electrode 52b are spaced apart and arranged on the same side of the phase change material 51 away from the drive circuit layer 10, and are arranged away from the position corresponding to the phase change material 51. In this way, cholesteric liquid crystals emitting different light can share the same first drive electrode 52a or the same second drive electrode 52b. This arrangement simplifies the structure of the phase change structure layer 5. In addition, the drive element 52 arranged in this manner does not need to be made of transparent material, and can still avoid blocking the light emitted by the light-emitting unit 30.

[0061] Continuing to refer to FIG4 , the cholesteric liquid crystal is configured to be able to change from a first state to a second state under a driving voltage, and to be able to return to the first state from the second state after the driving voltage disappears. It can be understood that when the display panel 100 is not displaying color, the first driving electrode 52a and the second driving electrode 52b on both sides of the cholesteric liquid crystal do not provide voltage. At this time, the cholesteric liquid crystal is in the first state, and the ambient light reaching the cholesteric liquid crystal through the organic light-emitting layer 3 will pass through the cholesteric liquid crystal. The ambient light is further absorbed by the first light-absorbing layer 6, reducing the impact of external ambient light on the display panel 100, while making the display panel 100 have a better black state when not displaying. Furthermore, the display panel 100 generally stays in the non-display state for a longer time, and no voltage needs to be applied to the cholesteric liquid crystal when not displaying, which can save energy and electricity. When the display panel 100 needs to display color during use, the first driving electrode 52a and the second driving electrode 52b on both sides of the cholesteric liquid crystal provide voltage. At this time, the cholesteric liquid crystal is in the second state. The ambient light reaching the cholesteric liquid crystal through the organic light-emitting layer 3 or the light emitted by the organic light-emitting layer 3 to the side of the phase change material 51 will be reflected by the cholesteric liquid crystal. The reflected light will pass through the organic light-emitting layer 3, enhancing the light of the organic light-emitting layer 3, thereby improving the luminous efficiency and contrast of the display panel 100.

[0062] Referring further to Figure 4 , the phase change unit 50 of this embodiment further includes an encapsulation cavity 53. Encapsulation cavity 53 has a receiving chamber 53a; the cholesteric liquid crystal is disposed within receiving chamber 53a. Specifically, encapsulation cavity 53 is a microcup with a height of 20-50 μm. The area of ​​receiving chamber 53a is equal to or greater than the opening area of ​​the anode pixel (not shown), which helps ensure that the pixel opening is not affected.

[0063] Further referring to Figures 1 and 4, the first drive electrode 52a is disposed on the surface of the packaging cavity 53 on the side close to the drive circuit layer 10, and the second drive electrode 52b is disposed on the surface of the packaging cavity 53 on the side close to the anode electrode layer 2. An insulating layer (not shown) is provided between the second drive electrode 52b and the anode electrode layer 2 to ensure insulation between the second drive electrode 52b and the anode electrode layer 2. The multiple packaging cavities 53 of the multiple phase change units 50 are interconnected to form a packaging layer B. The packaging layer B has multiple first conductive vias A spaced apart from the accommodating cavities 53a. The anode electrode layer 2 mentioned above is electrically connected to the drive circuit layer 10 through the first conductive vias A to achieve electrical signal transmission. It will be understood that in specific embodiments, the specific positions and number of the first conductive vias A will be designed to meet the actual design requirements of the display panel 100 and are not limited here, as long as electrical connection is ensured.

[0064] Refer to Figure 6, which is a schematic diagram of the structure of a display panel provided in another embodiment of the present application. The display panel 100 provided in this embodiment has a structure that is basically the same as the display panel 100 provided in Figure 1, except that the display panel 100 in this embodiment further includes a second light-absorbing layer 7 disposed on the phase change structure layer 5 away from the drive circuit layer 10. The second light-absorbing layer 7 includes a plurality of light-absorbing units 70, and the light-absorbing units 70 are disposed at positions corresponding to positions between two adjacent phase change units 50, and are used to absorb light of different colors reflected from the phase change units 50 to avoid color mixing between the phase change units 50. Specifically, the second light-absorbing layer 7 can be located between the electrode layer where the second drive electrode 52b is located and the anode electrode layer 2, or can be disposed on the same layer as the second drive electrode 52b.

[0065] Please refer to Figures 6 and 7. Figure 7 is a schematic diagram of electrode connection provided in an embodiment of the present application. The multiple second drive electrodes 52b of the multiple phase change units 50 are interconnected. Specifically, the multiple second drive electrodes 52b can be connected in a mesh shape, or can be a continuous whole layer structure. As long as the multiple second drive electrodes 52b can be connected to each other, the present application does not impose any restrictions on this. In this embodiment, the multiple second drive electrodes 52b are mainly described as a continuous whole layer; the multiple second drive electrodes 52b have openings corresponding to the first conductive through holes A to avoid short circuit between the second drive electrodes 52b and the anode electrode layer 2. The second drive electrode 52b is electrically connected to the cathode electrode layer 4 at the edge of the display panel 100. The multiple first drive electrodes 52a of the multiple phase change units 50 are each electrically connected to the drive circuit unit in the drive circuit layer 10.

[0066] Please refer to Figures 6 and 8. Figure 8 is a schematic diagram of electrode connection provided in another embodiment of the present application. The multiple first drive electrodes 52a of the multiple phase change units 50 are interconnected. Specifically, the multiple first drive electrodes 52a can be connected in a mesh shape, or can be a continuous whole layer structure. As long as the multiple first drive electrodes 52a can be connected to each other, the present application does not impose any restrictions on this. In this embodiment, the first drive electrode 52a is mainly taken as a continuous whole layer as an example. The first drive electrode 52a is electrically connected to the cathode electrode layer 4 at the edge of the display panel 100. Among them, the encapsulation layer B also has a plurality of second conductive through holes (not marked in the figure) spaced apart from the accommodating cavity 53a, and the multiple second drive electrodes 52b of the multiple phase change units 50 are each electrically connected to the drive circuit layer 10 through the second conductive through holes of the encapsulation layer B.

[0067] Refer to Figure 9, which is a schematic diagram of the structure of the driving circuit provided in one embodiment of the present application. The present application also provides a driving circuit 200 for driving the display panel 100 involved in the above embodiment. The driving circuit 200 includes a judgment module 300 and a driving module 400. In combination with Figure 9 and Figure 6, the judgment module 300 is used to judge the state of the display panel 100; the driving module 400 is used to drive the phase change unit 50 of the display panel 100 according to the judgment result of the judgment module 300. In which, in response to the display panel 100 being in a non-display state, the driving module 400 drives the phase change material 51 to be in a first state through the driving element 52; in response to the display panel 100 being in a display state, the driving module 400 drives the phase change material 51 to be in a second state through the driving element 52. That is, when the display panel 100 is in the non-displaying state, ambient light reaching the phase change material 51 via the organic light-emitting layer 3 is absorbed by the phase change material 51, resulting in a better black state when the display panel 100 is not displaying. Furthermore, the display panel 100 generally remains in the non-displaying state for a longer period of time, and no voltage needs to be applied to the cholesteric liquid crystal during this non-displaying state, thereby saving energy and electricity. When the display panel 100 is in the displaying state, ambient light reaching the phase change material 51 via the organic light-emitting layer 3 is reflected by the phase change material 51. The reflected light passes through the organic light-emitting layer 3, enhancing the light from the organic light-emitting layer 3 and improving the luminous efficiency and contrast of the display panel 100.

[0068] Refer to Figure 10, which is a schematic diagram of the structure of a display device provided in one embodiment of the present application. The present application also provides a display device 500, including a display panel 100 and a drive circuit 200. The specific structure and function of the display panel 100 and the drive circuit 200 can be found in the description of the display panel 100 and the drive circuit 200 provided in the above embodiment, and will not be repeated here. The display device 500 can specifically be a self-luminous product, such as a laptop computer, mobile phone, television, etc. made of OLED or Mini-LED.

[0069] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present application is defined by the appended claims, not the foregoing description, and all variations within the meaning and scope of the appended claims are intended to be included herein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0070] The above description is only an implementation method 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 description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, comprising: A driving substrate, including a driving circuit layer; an anode electrode layer, disposed on one side of the driving circuit layer and electrically connected to the driving circuit layer; An organic light-emitting layer, arranged on a side of the anode electrode layer away from the driving circuit layer, comprising a plurality of light-emitting units; A cathode electrode layer, disposed on a side of the organic light emitting layer away from the driving circuit layer and electrically connected to the driving circuit layer; The invention is characterized in that it further comprises a phase change structure layer, which is arranged between the anode electrode layer and the driving circuit layer; the phase change structure layer comprises a plurality of phase change units arranged corresponding to the plurality of light-emitting units, and the phase change units comprise: A phase change material having a first state and a second state; a driving element, electrically connected to the driving circuit layer, and configured to drive the phase change material to be in the first state or the second state; A first light absorbing layer is disposed on a side of the phase change material close to the driving circuit layer; The phase change material is light-transmissive in the first state, so that the first light-absorbing layer absorbs ambient light from the outside; the phase change material is capable of reflecting light of the same color as the emitted light of the corresponding light-emitting unit in the second state.

2. The display panel according to claim 1, characterized in that: The phase change material is cholesteric liquid crystal.

3. The display panel according to claim 2, characterized in that: The driving element includes a first driving electrode and a second driving electrode.

4. The display panel according to claim 3, characterized in that: The first driving electrode and the second driving electrode are respectively disposed on opposite sides of the cholesteric liquid crystal, and are used to apply a driving voltage to the cholesteric liquid crystal.

5. The display panel according to claim 4, characterized in that: The cholesteric liquid crystal is configured to be able to change from a first state to a second state under the driving voltage, and to be able to restore from the second state to the first state after the driving voltage disappears.

6. The display panel according to claim 4, characterized in that: The phase change unit further includes a packaging cavity.

7. The display panel according to claim 6, characterized in that: The packaging cavity has a containing cavity; the phase change material is arranged in the containing cavity.

8. The display panel according to claim 7, characterized in that: The first driving electrode is disposed on a side of the packaging cavity close to the driving circuit layer, and the second driving electrode is disposed on a side of the packaging cavity close to the anode electrode layer.

9. The display panel according to claim 8, characterized in that: The multiple packaging cavities of the multiple phase change units are connected to each other to form a packaging layer, and the packaging layer has a plurality of first conductive through holes arranged at intervals from the accommodating cavities.

10. The display panel according to claim 9, characterized in that: The anode electrode layer is electrically connected to the driving circuit layer through the first conductive through hole.

11. The display panel according to claim 10, characterized in that: The plurality of second driving electrodes of the plurality of phase change units are connected to each other and electrically connected to the cathode electrode layer; the plurality of first driving electrodes of the plurality of phase change units are electrically connected to the driving circuit layer respectively; or The multiple first driving electrodes of the multiple phase change units are connected to each other and electrically connected to the cathode electrode layer; the multiple second driving electrodes of the multiple phase change units are respectively electrically connected to the driving circuit layer through the second conductive through holes of the packaging layer.

12. The display panel according to claim 10, characterized in that: The display panel further includes a second light absorption layer disposed on the phase change structure layer away from the driving circuit layer.

13. The display panel according to claim 12, characterized in that: The second light absorbing layer includes a plurality of light absorbing units, and the light absorbing units are arranged at positions corresponding to positions between two adjacent phase change units.

14. The display panel according to claim 1, characterized in that: The anode electrode layer is a transparent electrode layer.

15. A driving circuit for driving the display panel according to claim 1, comprising: A judging module, used for judging the state of the display panel; A driving module, used for driving the phase change unit according to the determination result of the determination module; In response to the display panel being in a non-display state, the driving module drives the phase change material to be in the first state through the driving element; in response to the display panel being in a display state, the driving module drives the phase change material to be in the second state through the driving element.

16. A display device, characterized in that: include: A display panel, comprising the display panel according to claim 1; A driving circuit comprising the driving circuit according to claim 15.

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