Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method of the display panel and a display device. The display panel comprises a substrate, a packaging structure, an electrochromic structure and a plurality of light-emitting devices, wherein the packaging structure, the electrochromic structure and the light-emitting devices are located on the substrate. The packaging structure is located on the side, away from the substrate, of the light-emitting device, the electrochromic structure is located between the packaging structure and the substrate, and the orthographic projection of the electrochromic structure on the substrate is located in the orthographic projection of the gap of the light-emitting device on the substrate. According to the display panel, the electrochromic structure is arranged below the packaging structure, the distance between the electrochromic structure and the light-emitting device can be reduced, the shielding effect of the electrochromic structure on light emitted by the light-emitting device after the electrochromic structure is switched into the shading state is improved, and therefore the peep-proof function of the display panel is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular, to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) is an organic thin film electroluminescent device. It has attracted great attention and is widely used in electronic display products due to its advantages such as simple preparation process, low cost, low power consumption, high brightness, wide viewing angle, high contrast and flexible display.

[0003] However, current electronic display products are limited by their own structural design, and it is difficult to ensure a lightweight design while ensuring anti-peeping functions. Summary of the invention

[0004] In a first aspect, the present disclosure provides a display panel, comprising a substrate, a packaging structure, an electrochromic structure, and a plurality of light-emitting devices on the substrate. The packaging structure is located on a side of the light-emitting device away from the substrate, the electrochromic structure is located between the packaging structure and the substrate, and the orthographic projection of the electrochromic structure on the substrate is located within the orthographic projection of the gap of the light-emitting device on the substrate.

[0005] In the above scheme, the electrochromic structure is arranged below the packaging structure, which can reduce the distance between the electrochromic structure and the light-emitting device, so as to increase the shielding effect of the electrochromic structure on the light emitted by the light-emitting device after switching to the shading state, thereby improving the anti-peeping function of the display panel.

[0006] In a specific embodiment of the first aspect of the present disclosure, the display panel may further include an isolation structure located on the substrate, the isolation structure defining a plurality of isolation openings that respectively define the light-emitting devices, the encapsulation structure being located on a side of the isolation structure facing away from the substrate, the electrochromic structure being located between the encapsulation structure and the isolation structure, and the orthographic projection of the electrochromic structure on the substrate being located within the orthographic projection of the isolation structure on the substrate.

[0007] In the above scheme, the setting of the isolation structure can increase the height of the electrochromic structure to further improve the anti-peeping function of the display panel; in addition, the light-emitting devices are prepared in batches based on the isolation structure, so that the preparation of some film layers in the light-emitting devices is not limited by the accuracy of the mask plate, and the position of the film layer in the light-emitting device is strictly controlled, thereby accurately controlling the position and light-emitting area of ​​the light-emitting device, and allowing a smaller gap to be set between the light-emitting devices to increase the pixel density PPI of the display panel; in addition, the scheme can independently prepare the light-emitting devices to control the thickness of the film layer in each light-emitting device, thereby improving the microcavity effect of the light-emitting device to improve the luminous efficiency of the light-emitting device.

[0008] In a specific embodiment of the first aspect of the present disclosure, the light-emitting device includes a first electrode, a light-emitting functional layer and a second electrode stacked in sequence on a substrate, and the light-emitting functional layer and the second electrode of the light-emitting device are located within corresponding isolation openings.

[0009] In a specific embodiment of the first aspect of the present disclosure, the electrochromic structure includes a third electrode and an electrochromic layer that are stacked. Thus, an electric field is applied through the third electrode, and the magnitude of the electric field strength is controlled to switch the electrochromic layer between a transparent state and a light-shielding state.

[0010] In a specific embodiment of the first aspect of the present disclosure, the third electrode is located between the electrochromic layer and the isolation structure, and the third electrode is in the same layer and the same material as the second electrode in at least one light-emitting device. In this way, the third electrode can be prepared simultaneously in the process of preparing the light-emitting device using the isolation structure, thereby reducing the process flow of the display panel to control costs; in addition, this method can accurately control the formation position of the third electrode to ensure that the third electrode is formed in the gap between the light-emitting devices to ensure the display effect of the display panel; in addition, the third electrode is prepared simultaneously in the process of preparing the second electrode based on the isolation structure, so that the edge of the third electrode can be extended to the edge of the display area of ​​the display panel, and then connected to the external circuit, and its setting will not affect the circuit structure below.

[0011] Optionally, the light emitting devices are classified into a plurality of types with different light emitting colors, and the third electrode is in the same layer and made of the same material as the second electrode in the light emitting device with one light emitting color.

[0012] Optionally, the display panel includes a display area, a non-display area, and a first signal line and a second signal line arranged in the non-display area, the light-emitting device is located in the display area, the first signal line is electrically connected to the isolation structure, and the second signal line is electrically connected to the third electrode.

[0013] Optionally, the first signal line and the second signal line are in the same layer and made of the same material, the display panel includes a switching line located in the non-display area, the switching line and the third electrode are in the same layer and made of the same material, and the second signal line is electrically connected to the third electrode through the switching line.

[0014] In a specific embodiment of the first aspect of the present disclosure, the display panel further includes a first filling layer, the first filling layer is located between the third electrode and the isolation structure, and the first filling layer is in the same layer and made of the same material as at least part of the light-emitting functional layer. In this way, the provision of the first filling layer does not increase the process flow of the display panel, and the first filling layer can also increase the provision height of the electrochromic structure to further enhance the shading effect of the electrochromic structure in the shading state, thereby further improving the anti-peeping function of the display panel.

[0015] In a specific embodiment of the first aspect of the present disclosure, the light-emitting devices are classified to emit light of multiple colors, and at least part of the light-emitting functional layer of the light-emitting devices emitting light of different colors is made of different materials, and the light-emitting functional layer in the same layer as the first filling layer has the same light-emitting color. In this way, in the process of preparing light-emitting devices in batches based on the isolation structure, the third electrode can be prepared simultaneously when preparing one batch of light-emitting devices, and the first filling layer can also be prepared simultaneously during this process, thereby reducing the process flow of the display panel to control costs.

[0016] In a specific embodiment of the first aspect of the present disclosure, the electrochromic structure further includes a fourth electrode, and the electrochromic layer is located between the fourth electrode and the third electrode. By providing the third electrode and the fourth electrode, a high-intensity electric field can be easily formed between the third electrode and the fourth electrode, so that a relatively small voltage intensity can be applied to the third electrode while ensuring the electric field intensity.

[0017] In a specific embodiment of the first aspect of the present disclosure, the fourth electrode covers the isolation structure and the light-emitting device, and the fourth electrode is a transparent electrode.

[0018] In another specific embodiment of the first aspect of the present disclosure, the fourth electrode is a grid-shaped electrode, and the orthographic projection of the fourth electrode on the substrate is located within the orthographic projection of the isolation structure on the substrate.

[0019] In a specific embodiment of the first aspect of the present disclosure, the encapsulation structure includes a first encapsulation layer covering the light-emitting device, the first encapsulation layer includes a plurality of encapsulation units corresponding to the light-emitting devices, and the encapsulation units cover the isolation openings. In the process of preparing light-emitting devices in batches based on the isolation structure, the encapsulation units are formed synchronously with the corresponding light-emitting devices. After each batch of light-emitting devices is prepared, the encapsulation units can encapsulate and protect the prepared light-emitting devices in the process of preparing the next batch of light-emitting devices to ensure the light-emitting effect of the light-emitting devices.

[0020] Optionally, the packaging unit extends to a side of the isolation structure away from the substrate, and at least a portion of an edge portion of the packaging unit is spaced from the isolation structure on the side of the isolation structure away from the substrate to form a suspended portion.

[0021] Optionally, in one embodiment, adjacent packaging units are spaced apart from each other, and the electrochromic structure is located in the gap between adjacent packaging units.

[0022] Optionally, in another embodiment, the packaging unit corresponding to some light-emitting devices covers at least a portion of the surface of the adjacent isolation structure facing away from the substrate, and on the side of the isolation structure facing away from the substrate, the electrochromic structure is located on the surface of the packaging unit facing away from the substrate.

[0023] Optionally, the display panel includes a second encapsulation layer and a third encapsulation layer covering the first encapsulation layer, the second encapsulation layer is located between the first encapsulation layer and the third encapsulation layer, and the electrochromic structure is located between the second encapsulation layer and the isolation structure.

[0024] Optionally, the second encapsulation layer is an organic film layer, and the first encapsulation layer and the third encapsulation layer are inorganic film layers.

[0025] In the above scheme, the second encapsulation layer can improve the flatness of the display panel surface, so as to facilitate the arrangement of other components on the encapsulation layer; in addition, the second encapsulation layer can have a certain flexibility to relieve the stress of the first encapsulation layer and the third encapsulation layer, thereby improving the reliability of the display panel, which is more conducive to the application of the display panel in the field of flexible display; in addition, the third encapsulation layer has high density and has a high barrier effect against water, oxygen, etc., and the third encapsulation layer has higher strength, so as to facilitate the preparation of other components thereon (such as structures related to touch functions, optical film layers, etc.).

[0026] In a specific embodiment of the first aspect of the present disclosure, a portion of the first encapsulation layer covering the isolation opening forms a groove, and the display panel further includes a second filling layer, which fills the groove, and the refractive index of the second filling layer is greater than that of the first encapsulation layer.

[0027] In the above scheme, the second filling layer can improve the extraction efficiency of the light emitted by the light-emitting device, and can guide the obliquely emitted light to be emitted in the direction of the normal viewing angle to reduce the probability of being blocked by the isolation structure and the electrochromic structure (which is in the light-blocking state at this time), thereby improving the light output rate of the display panel at the normal viewing angle and the brightness of the displayed image.

[0028] In a specific implementation of the first aspect of the present disclosure, the second filling layer includes filling units corresponding to the isolation openings respectively, and the filling units fill the grooves.

[0029] Optionally, the surface of the filling unit facing away from the substrate is flush with the surface of the electrochromic layer facing away from the substrate, or the distance from the surface of the filling unit facing away from the substrate to the surface of the substrate is smaller than the distance from the surface of the electrochromic layer facing away from the substrate to the surface of the substrate.

[0030] In a specific embodiment of the first aspect of the present disclosure, the isolation structure includes a support portion and a crown portion, the support portion is located between the crown portion and the substrate, and the orthographic projection of the support portion on the substrate is located within the orthographic projection of the crown portion on the substrate. In this way, the isolation structure can improve the isolation effect of a part of the film layer in the light-emitting device (such as the light-emitting functional layer described below or a part of the film layer included therein).

[0031] Optionally, the second electrode is electrically connected to the side wall of the support portion, and at least a portion of the support portion is a conductive structure. In this way, the second electrodes can be connected through the isolation structure to reduce the voltage drop when the second electrodes are driven. In addition, the current (crosstalk current) escaping from the light-emitting device will preferentially enter the isolation structure and be conducted out, thereby reducing the risk of the current entering other adjacent light-emitting devices to alleviate the current crosstalk problem.

[0032] In a specific embodiment of the first aspect of the present disclosure, the isolation structure includes a bottom portion, the bottom portion is a conductive structure and is located between the substrate and the support portion, the orthographic projection of the support portion on the substrate is located within the orthographic projection of the bottom portion on the substrate, and the second electrode is electrically connected to a portion of the surface of the bottom portion that is away from the substrate and is not covered by the support portion. The second electrode is more easily deposited on the surface of the bottom portion that is away from the substrate relative to the side wall of the support portion, so that by providing the bottom portion, the impedance at the connection between the isolation structure and the second electrode can be reduced.

[0033] Optionally, the orthographic projection of the bottom on the substrate is located within the orthographic projection of the crown on the substrate. In this way, the isolation effect of the isolation structure (crown) on part of the film layer in the light-emitting device can be ensured.

[0034] In a specific embodiment of the first aspect of the present disclosure, the display panel includes a pixel defining layer located between the substrate and the isolation structure, the pixel defining layer defines a plurality of pixel openings corresponding to the isolation openings respectively, and the pixel openings are connected to the corresponding isolation openings to limit the light-emitting device.

[0035] Optionally, the pixel defining layer is an inorganic layer.

[0036] The second aspect of the present disclosure provides a display panel, which includes a substrate, an isolation structure, an electrochromic structure, and a plurality of light-emitting devices located on the substrate. Each light-emitting device includes a first electrode, a light-emitting functional layer, and a second electrode stacked in sequence on the substrate, the isolation structure is located on the substrate and defines a plurality of isolation openings corresponding to the light-emitting devices, respectively, the light-emitting functional layer and the second electrode of the light-emitting device are located in the corresponding isolation openings, the electrochromic structure is located on the side of the isolation structure away from the substrate, and includes a third electrode and an electrochromic layer, the orthographic projection of the electrochromic structure on the substrate is located within the orthographic projection of the isolation structure on the substrate, and the third electrode is in the same layer and the same material as the second electrode.

[0037] In the above scheme, the third electrode can be prepared simultaneously in the process of preparing the light-emitting device using the isolation structure, thereby reducing the process flow of the display panel to control costs; in addition, this method can accurately control the formation position of the third electrode to ensure that the third electrode is formed in the gap of the light-emitting device to ensure the display effect of the display panel.

[0038] In a specific implementation of the second aspect of the present disclosure, the display panel may further include a first filling layer, the first filling layer is located between the third electrode and the isolation structure, and the first filling layer is in the same layer and made of the same material as the light-emitting functional layer.

[0039] Optionally, the light emitting devices are classified to emit light of multiple colors, and at least part of the light emitting functional layers of the light emitting devices emitting light of different colors are made of different materials, and the light emitting functional layers in the same layer as the first filling layer have the same light emitting color.

[0040] Optionally, the electrochromic structure further includes a fourth electrode, and the electrochromic layer is located between the fourth electrode and the third electrode.

[0041] Optionally, the fourth electrode covers the isolation structure and the light-emitting device, and the fourth electrode is a transparent electrode; or, the fourth electrode is a grid-shaped electrode, and the orthographic projection of the fourth electrode on the substrate is located within the orthographic projection of the isolation structure on the substrate.

[0042] In a specific embodiment of the second aspect of the present disclosure, the display panel may further include a packaging structure, the packaging structure is located on a side of the light-emitting device and the isolation structure away from the substrate, and the electrochromic structure is located between the packaging structure and the isolation structure.

[0043] Optionally, the encapsulation structure includes a first encapsulation layer covering the light-emitting device, the first encapsulation layer includes a plurality of encapsulation units corresponding to the light-emitting devices respectively, and the encapsulation units cover the isolation openings.

[0044] Optionally, a portion of the first encapsulation layer covering the isolation opening forms a groove, and the display panel further includes a second filling layer, which fills the groove, and a refractive index of the second filling layer is greater than that of the first encapsulation layer.

[0045] A third aspect of the present disclosure provides a display device, which includes the display panel in the first aspect and the second aspect.

[0046] The fourth aspect of the present disclosure provides a method for preparing a display panel, the method comprising: providing a substrate and forming a plurality of first electrodes on the substrate; forming an isolation structure on the substrate on which the first electrodes are formed, wherein the isolation structure defines a plurality of isolation openings corresponding to the first electrodes respectively; sequentially depositing a light-emitting functional material layer and a conductive material layer to cover the isolation structure and the isolation openings; sequentially forming an encapsulation material layer on a side of the conductive material layer away from the substrate; performing a patterning process on the light-emitting functional material layer, the conductive material layer, and the encapsulation material layer to remove the light-emitting functional material layer, the conductive material layer, and the encapsulation material layer corresponding to a portion of the isolation openings, wherein the remaining light-emitting functional material layer forms a light-emitting functional layer, the remaining conductive material layer forms a second electrode, and the remaining encapsulation material layer forms a The light-emitting functional layer and the second electrode form a packaging unit, and the first electrode corresponding to the isolation opening constitutes a light-emitting device; the above-mentioned process of preparing the light-emitting functional layer, the second electrode and the packaging unit is repeated in batches at the isolation opening where the light-emitting functional layer is not formed, until a light-emitting device and a packaging unit are formed at each isolation opening, wherein, in the process of forming any batch of light-emitting devices, the portion of the conductive material layer overlapping with the isolation structure is retained to form a third electrode; an electrochromic material layer is deposited, and the electrochromic material layer is patterned to form an electrochromic layer corresponding to the third electrode, wherein the third electrode and the electrochromic layer constitute an electrochromic structure, and the orthographic projection of the electrochromic structure on the substrate is located within the orthographic projection of the isolation structure on the substrate.

[0047] In the above-mentioned preparation method, the third electrode can be prepared simultaneously during the process of preparing the light-emitting device using the isolation structure, thereby reducing the process flow of the display panel to control costs; in addition, this method can accurately control the formation position of the third electrode to ensure that the third electrode is formed in the gap of the light-emitting device to ensure the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of a planar structure of a display panel provided in one embodiment of the present disclosure.

[0049] Figure 2 for Figure 1 An enlarged view of area S1 of the display panel is shown.

[0050] Figure 3 for Figure 2 The shown diagram is a cross-sectional view of a display panel along line MN in one design.

[0051] Figure 4A for Figure 2 The cross-section view of the display panel along line MN under another design is shown.

[0052] Figure 4B for Figure 2The cross-section view of the display panel along line MN under another design is shown.

[0053] Figure 5 for Figure 2 The cross-section view of the display panel along line MN under another design is shown.

[0054] Fig. 6A for Figure 2 The cross-section view of the display panel along line MN under another design is shown.

[0055] Figure 6B for Figure 2 The cross-section view of the display panel along line MN under another design is shown.

[0056] Figure 7 for Figure 2 The cross-section view of the display panel along line MN under another design is shown.

[0057] Figure 8 A flow chart of a method for preparing a display panel provided in one embodiment of the present disclosure.

[0058] FIG. 9A to FIG. 9J For forming a method according to an embodiment of the present disclosure Fig. 6A A process diagram of a method for preparing a display panel is shown.

[0059] FIG. 10A to FIG. 10D For forming a method according to an embodiment of the present disclosure Figure 6B A process diagram of a method for preparing a display panel is shown.

[0060] Fig.11 A schematic diagram of the positional relationship between a partial film layer of a display panel and an evaporation source during evaporation provided by an embodiment of the present disclosure.

[0061] Description of reference numerals:

[0062] 11-display area; 12-frame area; 100-substrate; 200-light-emitting device; 210-first electrode; 220-light-emitting functional layer; 221-first functional layer; 222-light-emitting layer; 223-second functional layer; 230-second electrode; 300-isolation structure; 301-isolation opening; 302-pixel opening; 303-groove; 310-support portion; 320-crown portion; 330-pixel defining layer; 330a-pixel defining material layer; 340-bottom; 400-packaging structure; 410-first packaging layer; 410a-first packaging film; 411-packaging unit; 420-second packaging layer; 430-third packaging layer; 500-electrochromic structure; 510-third electrode; 520-electrochromic layer; 530-fourth electrode; 610-first filling layer; 620-second filling layer; 700-photoresist pattern. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0064] In some application scenarios of display panels, there is a need for anti-peeping. Currently, the structure with anti-peeping function is mainly set on the packaging structure, which will make it difficult to further reduce the design thickness of the display panel, which is not conducive to the lightweight design of the display panel; in addition, this design will also cause a certain distance between the structure with anti-peeping function and the display function layer of the display panel (for example, including the light-emitting device described below), which makes it difficult to completely block the obliquely emitted light, resulting in limited anti-peeping effect.

[0065] The embodiments of the present disclosure provide a display panel, a method for preparing the same, and a display device to at least solve the above-mentioned technical problems. The display panel includes a substrate, and a packaging structure, an electrochromic structure, and a plurality of light-emitting devices located on the substrate. The packaging structure is located on the side of the light-emitting device that is away from the substrate, the electrochromic structure is located between the packaging structure and the substrate, and the orthographic projection of the electrochromic structure on the substrate is located within the orthographic projection of the gap of the light-emitting device on the substrate. In the display panel, the electrochromic structure is disposed below the packaging structure, which can reduce the distance between the electrochromic structure and the light-emitting device, so as to increase the shielding effect of the electrochromic structure on the light emitted by the light-emitting device after switching to the shading state, thereby improving the anti-peeping function of the display panel.

[0066] The structure of the display panel in at least one embodiment of the present disclosure is described in detail below with reference to the accompanying drawings. In addition, in these drawings, a spatial rectangular coordinate system is established with the substrate as a reference to more intuitively present the positional relationship of the relevant structures in the display panel, and in the spatial rectangular coordinate system, the X-axis and the Y-axis are parallel to the surface where the substrate is located, and the Z-axis is perpendicular to the surface where the substrate is located.

[0067] like Figures 1 to 3As shown, the plane area of ​​the display panel 10 can be divided into a display area 11 and a border area 12 surrounding the display area 11 (which may include a non-display area or referred to as a non-display area), and sub-pixels (which may be referred to as sub-pixels, etc.) may be arranged in the display area 11, such as R, G, and B sub-pixels, and the physical structure of the sub-pixel may be a light-emitting device, and adjacent sub-pixels with different colors of emitted light constitute a pixel (which may be referred to as a pixel unit, a large pixel, etc.), and the arrangement density of the pixel in the display area 11 represents the pixel density PPI. It should be noted that in some embodiments of the present disclosure, part of the wiring in the border area 12 may be arranged in the display area 11, so that the border area 12 may be designed as a single-sided border.

[0068] The physical structure of the display panel 10 may include a substrate 100, and an encapsulation structure 400, an electrochromic structure 500, and a plurality of light-emitting devices 200 located on the substrate 100. The encapsulation structure 400 is located on the side of the light-emitting device 200 that is away from the substrate 100, the electrochromic structure 500 is located between the encapsulation structure 400 and the substrate 100, and the orthographic projection of the electrochromic structure 500 on the substrate 100 is located within the orthographic projection of the gap between the light-emitting devices 200 on the substrate 100. In this way, the electrochromic structure 500 is located below the encapsulation structure 400, so that there is a small spacing distance between the electrochromic structure 500 and the light-emitting device 200 in a direction perpendicular to the surface of the substrate 100, or there is no spacing between the two, thereby improving the anti-peeping effect of the electrochromic structure 500.

[0069] For example, the electrochromic structure 500 can switch between a transparent state and a light-shielding state. When the electrochromic structure 500 is in the transparent state, the electrochromic structure 500 will not block the light emitted by the light-emitting device 200. After the electrochromic structure 500 switches to the light-shielding state, the large-angle light emitted by the light-emitting device 200 will be blocked and absorbed by the electrochromic structure 500, thereby limiting the viewing angle of the display panel to achieve an anti-peeping effect.

[0070] In some application scenarios of display panels, some functional film layers in the light-emitting devices are formed by evaporation, and there are multiple functional film layers in each light-emitting device, and the materials of some functional film layers (such as light-emitting layers) in the light-emitting devices that emit different light are different. Therefore, when evaporating these functional film layers through a mask plate (such as a fine mask plate), multiple alignments are required. In order to solve the position offset problem caused by alignment accuracy errors, sufficient space (and safety margin related to alignment errors) needs to be reserved between different light-emitting devices to ensure that the position of the actual light-emitting area of ​​the light-emitting device can have a certain overlap rate with the designed position (design area), which is equivalent to compressing the design area of ​​the light-emitting area of ​​the light-emitting device, which not only limits the light-emitting area of ​​the light-emitting device, but also prevents the arrangement density of the light-emitting device from being further increased, making it difficult to further improve the PPI (pixel density) of the display panel.

[0071] In at least one embodiment of the present disclosure, an isolation structure can be provided at the gap between the light-emitting devices to isolate the functional film layers of adjacent light-emitting devices. In this way, in the evaporation process of the functional film layer, it is only necessary to perform evaporation on the entire surface of the display panel without using a mask plate to prepare the functional film layer of each light-emitting device separately. The process does not need to consider the alignment accuracy during evaporation, so that the gap between the light-emitting devices can be designed to be smaller in size to increase the PPI (the principle can be referred to in the following and FIG. 9A to FIG. 9J (See also the relevant description in the relevant embodiments).

[0072] The isolation structure is located in the gap between the light-emitting devices and will block the high-angle light emitted by the light-emitting devices. In this way, the isolation structure and the electrochromic structure can be set together to increase the height of the electrochromic structure through the isolation structure, thereby improving the shielding effect of the electrochromic structure on the high-angle light emitted by the light-emitting devices.

[0073] Next, the specific structure of the display panel with the isolation structure is described, wherein the arrangement relationship between the electrochromic structure and the isolation structure is introduced.

[0074] In at least one embodiment of the present disclosure, Figures 1 to 3 As shown, the display panel may further include an isolation structure 300 located on the substrate 100, the isolation structure 300 defines a plurality of isolation openings 301 that respectively define the light-emitting devices 200, that is, the plane shape of the isolation structure 300 presents a grid pattern, and the isolation openings 301 are meshes of the grid pattern. At least part of the film layer in the light-emitting device 200 is formed by the isolation structure 300, so the isolation openings 301 limit the light-emitting device 200, that is, the light-emitting area of ​​the light-emitting device 200 is located in the isolation openings 301.

[0075] It should be noted that the composition, preparation and other contents of the isolation structure 300 can also be referred to the relevant descriptions in patents PCT / CN2023 / 134518, 202310759370.2, 202310740412.8, 202310707209.0, and 202311346196.5, which will not be repeated here.

[0076] like Figures 1 to 3 As shown, the packaging structure 400 is located on the side of the isolation structure 300 facing away from the substrate 100 , the electrochromic structure 500 is located between the packaging structure 400 and the isolation structure 300 , and the orthographic projection of the electrochromic structure 500 on the substrate 100 is located within the orthographic projection of the isolation structure 300 on the substrate 100 . In this way, the setting of the isolation structure 300 can increase the height of the electrochromic structure 500 to further improve the anti-peeping function of the display panel; in addition, the light-emitting devices 200 are prepared in batches based on the isolation structure 300, so that the preparation of some film layers in the light-emitting device 200 is not limited by the accuracy of the mask plate, and the position of the film layer in the light-emitting device 200 is strictly controlled, so as to accurately control the position and light-emitting area of ​​the light-emitting device 200, and allow a smaller gap to be set between the light-emitting devices 200 to increase the pixel density PPI of the display panel; in addition, the scheme can independently prepare the light-emitting devices 200 to control the thickness of the film layer in each light-emitting device 200, thereby improving the microcavity effect of the light-emitting device 200 to improve the luminous efficiency of the light-emitting device 200.

[0077] In a specific embodiment of the first aspect of the present disclosure, the light-emitting device 200 includes a first electrode 210, a light-emitting functional layer 220, and a second electrode 230 sequentially stacked on a substrate 100, and the light-emitting functional layer 220 and the second electrode 230 of the light-emitting device 200 are located within the corresponding isolation opening 301. The light-emitting device 200 is formed in each isolation opening 301 based on the isolation structure 300, so that the light-emitting devices 200 emitting light of different colors can also be prepared in batches, so that the thickness of each film layer of the light-emitting functional layer 220 of each light-emitting device 200 can be individually controlled, that is, the thickness of each film layer in the light-emitting functional layer 220 of the light-emitting device 200 emitting light of different colors can also be different, so that the microcavity effect of the light-emitting device 200 can be enhanced to improve the luminous efficiency of the light-emitting device 200.

[0078] For example, in at least one embodiment of the present disclosure, the first electrode 210 may be provided as an anode, and the second electrode 230 may be provided as a cathode.

[0079] For example, the light-emitting functional layer 220 may further include a first functional layer 221, a light-emitting layer 222, and a second functional layer 223, which are sequentially stacked on the first electrode 210. The first functional layer 221 may include a hole injection layer, a hole transport layer, an electron blocking layer, etc. The second functional layer 223 may include an electron injection layer, an electron transport layer, a hole blocking layer, etc. It should be noted that since carriers (holes, electrons) mainly crosstalk between adjacent light-emitting devices 200 through the first functional layer 221, the isolation structure 300 needs to be set so that the first functional layers 221 of each light-emitting device 200 are electrically disconnected from each other.

[0080] For example, when the light-emitting devices 200 are prepared in batches based on the isolation structure 300, the thickness of the first functional layer 221 of the light-emitting devices 200 emitting light of different colors may be different, and / or the thickness of the second functional layer 223 of the light-emitting devices 200 emitting light of different colors may be different. In this way, the film thickness of the light-emitting device 200 of each color of light can be set independently, so that the microcavity effect of each light-emitting device 200 can reach the maximum extent, so as to improve the luminous efficiency of the light-emitting device 200.

[0081] In at least one embodiment of the present disclosure, Figure 3 As shown, the electrochromic structure 500 includes a stacked third electrode 510 and an electrochromic layer 520. Thus, an electric field is applied through the third electrode 510, and the magnitude of the electric field strength is controlled to switch the electrochromic layer 520 between a transparent state and a light shielding state.

[0082] In at least one embodiment of the present disclosure, the third electrode 510 is located between the electrochromic layer 520 and the isolation structure 300, and the third electrode 510 is in the same layer and the same material as the second electrode 230 in at least one light-emitting device 200 (for example, a light-emitting device 200 that emits light of one color). In this way, the third electrode 510 can be simultaneously prepared in the process of preparing the light-emitting device 200 using the isolation structure 300, thereby reducing the process flow of the display panel to control the cost; in addition, this method can accurately control the formation position of the third electrode 510 to ensure that the third electrode 510 is formed at the gap between the light-emitting devices 200 to ensure the display effect of the display panel; in addition, the third electrode 510 is simultaneously prepared in the process of preparing the second electrode based on the isolation structure, so that the edge of the third electrode 510 can be extended to the edge of the display area of ​​the display panel (for example, further extended to the bonding area 13 in the frame area), and then connected to the external circuit (for example, the main board circuit of the display panel), and its setting will not affect the circuit structure below (for example, the circuit in the substrate 100). The process for realizing the third electrode 510 and the second electrode 230 in the same layer and with the same material can be referred to below. FIG. 9A to FIG. 9J The relevant descriptions in the manufacturing process of the display panel shown are not repeated here.

[0083] In at least one embodiment of the present disclosure, the light emitting devices 200 are classified into multiple types with different light emission colors, and the third electrode 510 is in the same layer and made of the same material as the second electrode 230 in the light emitting device 200 with one light emission color. FIG. 9A to FIG. 9J In the illustrated embodiment, the method for manufacturing the display panel is described in detail, wherein the third electrode 510 is in the same layer and made of the same material as the second electrode 230 in the light emitting device 200 that emits green light G or blue light B.

[0084] In at least one embodiment of the present disclosure, it is possible to refer to Figure 1 The display panel includes a non-display area (for example, a frame area 12) and a first signal line 231 and a second signal line 511 arranged in the non-display area. The light-emitting device 200 is located in the display area. The first signal line 231 is electrically connected to the isolation structure 300, and the second signal line 511 is electrically connected to the third electrode 510.

[0085] In at least one embodiment of the present disclosure, Figure 1 and Figure 3 As shown, the first signal line 231 and the second signal line 511 are in the same layer and made of the same material. The display panel includes a switching line 512 located in the non-display area. The switching line 512 and the third electrode 510 are in the same layer and made of the same material. The second signal line 511 is electrically connected to the third electrode 510 through the switching line 512.

[0086] In at least one embodiment of the present disclosure, Figure 1 As shown, the non-display area may include a bonding area 13 , and the first signal line 231 and the second signal line 511 extend to the bonding area 13 to be connected to a bonding terminal (which may be called a pad) or a chip in the bonding area 13 .

[0087] In at least one embodiment of the present disclosure, Figure 3 As shown, the display panel may further include a first filling layer 610, the first filling layer 610 is located between the third electrode 510 and the isolation structure 300, and the first filling layer 610 is in the same layer and made of the same material as at least part of the light-emitting functional layer 220 (for example, the light-emitting functional layer 220 of the light-emitting device 200 that emits light of one color). For specific principles, see FIG. 9A to FIG. 9JThe following is a description of the method for preparing the display panel in the embodiment shown. In this way, the provision of the first filling layer 610 does not increase the process flow of the display panel, and the first filling layer 610 can also increase the setting height of the electrochromic structure 500 to further enhance the light shielding effect of the electrochromic structure 500 in the light shielding state, thereby further improving the anti-peeping function of the display panel. In the case where the third electrode 510 and the second electrode 230 are in the same layer and made of the same material, the reason for the formation of the first filling layer 610 can be seen in the following description of FIG. 9A to FIG. 9J The relevant descriptions in the manufacturing process of the display panel shown are not repeated here.

[0088] In at least one embodiment of the present disclosure, Figures 1 to 3 As shown, the light-emitting device 200 is classified into a plurality of color light-emitting devices. At least part of the light-emitting functional layer 220 of the light-emitting device 200 emitting light of different colors is made of different materials, and the light-emitting functional layer 220 of the same layer as the first filling layer 610 has the same light-emitting color. In this way, in the process of preparing the light-emitting devices 200 in batches based on the isolation structure 300, the third electrode 510 can be prepared simultaneously when preparing one batch of light-emitting devices 200. In this process, the first filling layer 610 is also prepared simultaneously, thereby reducing the process flow of the display panel to control the cost. The formation principle of the first filling layer 610 in this embodiment can be referred to the following about FIG. 9A to FIG. 9J The relevant descriptions in the manufacturing process of the display panel shown are not repeated here.

[0089] In at least one embodiment of the present disclosure, Figure 3 As shown, the encapsulation structure 400 includes a first encapsulation layer 410 covering the light-emitting device 200, and the first encapsulation layer 410 includes a plurality of encapsulation units 411 corresponding to the light-emitting devices 200, respectively, and the encapsulation units 411 cover the isolation openings 301. In the process of preparing the light-emitting devices 200 in batches based on the isolation structure 300, the encapsulation units 411 are formed synchronously with the corresponding light-emitting devices 200. After preparing each batch of light-emitting devices 200, the encapsulation units 411 can encapsulate and protect the prepared light-emitting devices 200 in the process of preparing the next batch of light-emitting devices 200, so as to ensure the light-emitting effect of the light-emitting devices 200.

[0090] In at least one embodiment of the present disclosure, Figure 3 As shown, the packaging unit 411 extends to the side of the isolation structure 300 away from the substrate 100 , and at the side of the isolation structure 300 away from the substrate 100 , the edge portion of the packaging unit 411 is spaced apart from the isolation structure 300 to form a suspended portion.

[0091] The light-emitting devices 200 with different emitted lights are independently manufactured, but the film layers (evaporated film layers such as light-emitting functional layers, etc.) in each light-emitting device 200 are evaporated on the entire surface of the display panel during evaporation. For example, the light-emitting devices 200 are classified into light-emitting devices that emit red light (R), green light (G), and blue light (B), respectively. During the preparation process, the light-emitting devices R, G, and B are prepared in sequence. When preparing the light-emitting device R, a light-emitting device R is formed in each isolation opening 301. A first encapsulation layer 410 is prepared on the display panel to cover the light-emitting device R. Then, the first encapsulation layer 410, the second electrode, and the light-emitting functional layer in some isolation openings 301 (used to form light-emitting devices G and B in the final product) are removed. During this process, the first encapsulation layer 410 is used to protect the light-emitting devices R in other isolation openings 301 (used to form light-emitting devices R in the final product). Based on this method, the light-emitting devices G and B are prepared in sequence to finally form the following. Fig. 6A The first encapsulation layer 410 shown, that is, the first encapsulation layer 410 on the entire display panel is prepared by multiple processes, and the first encapsulation layer 410 is also formed to include a plurality of encapsulation units 411 spaced apart from each other. The process can be referred to below FIG. 9A to FIG. 9J The relevant descriptions in the relevant embodiments are not repeated here.

[0092] It should be noted that in the embodiments of the present disclosure, there is no restriction on the preparation order of the three types of light-emitting devices R, G, and B, and it can be designed according to the actual process requirements. For example, the preparation process can also be implemented based on the order of light-emitting devices B, G, and R.

[0093] In at least one embodiment of the present disclosure, Figure 3 As shown, the display panel includes a second encapsulation layer 420 and a third encapsulation layer 430 covering the first encapsulation layer 410, the second encapsulation layer 420 is located between the first encapsulation layer 410 and the third encapsulation layer 430, and the electrochromic structure 500 is located between the second encapsulation layer 420 and the isolation structure 300. For example, the second encapsulation layer 420 is an organic film layer, and the first encapsulation layer 410 and the third encapsulation layer 430 are inorganic film layers. The second encapsulation layer 420 can improve the flatness of the surface of the display panel, so that other components can be arranged on the encapsulation layer; in addition, the second encapsulation layer 420 can have a certain flexibility to relieve the stress of the first encapsulation layer 410 and the third encapsulation layer 430, thereby improving the reliability of the display panel, which is more conducive to the application of the display panel in the field of flexible display; in addition, the third encapsulation layer 430 has high density and has a high barrier effect on water, oxygen, etc., and the third encapsulation layer 430 has higher strength, so that other components (such as structures related to touch functions, optical film layers, etc.) can be prepared thereon.

[0094] In at least one embodiment of the present disclosure, Figure 4AAs shown, the portion of the first encapsulation layer 410 covering the isolation opening 301 forms a groove 303, and the display panel further includes a second filling layer 620, which fills the groove 303, and the refractive index of the second filling layer 620 is greater than the refractive index of the first encapsulation layer 410. The second filling layer 620 can improve the extraction efficiency of the light emitted by the light-emitting device 200, and can guide the obliquely emitted light to be emitted in the direction of the normal viewing angle, so as to reduce the probability of being shielded by the isolation structure 300 and the electrochromic structure 500 (which is in the light-shielding state at this time), thereby improving the light extraction rate of the display panel at the normal viewing angle and the brightness of the displayed image.

[0095] In at least one embodiment of the present disclosure, Figure 4A and Figure 4B As shown, the second filling layer 620 includes filling units corresponding to the isolation openings 301, and the filling units fill the grooves 303. Figure 4A As shown, the surface of the filling unit facing away from the substrate 100 is flush with the surface of the electrochromic layer 520 facing away from the substrate 100, so as to prepare other structures on the side of the second filling layer 620 facing away from the substrate 100 (for example, to provide a flattened surface to facilitate the formation of the fourth electrode mentioned below); or, Figure 4B As shown, the distance between the surface of the filling unit facing away from the substrate 100 and the surface of the substrate 100 is smaller than the distance between the surface of the electrochromic layer 520 facing away from the substrate 100 and the surface of the substrate 100 .

[0096] In at least one embodiment of the present disclosure, Figures 5 to 7 As shown, the electrochromic structure 500 further includes a fourth electrode 530, and the electrochromic layer 520 is located between the fourth electrode 530 and the third electrode 510. By providing the third electrode 510 and the fourth electrode 530, a high-intensity electric field can be easily formed between the third electrode 510 and the fourth electrode 530, so that a relatively small voltage intensity can be applied to the third electrode 510 while ensuring the electric field intensity.

[0097] In some embodiments of the present disclosure, Figure 5 As shown, the fourth electrode 530 covers the isolation structure 300 and the light emitting device 200, and the fourth electrode 530 is a transparent electrode. In this way, the fourth electrode 530 can be prevented from blocking the light emitted by the light emitting device 200. For example, the material of the fourth electrode 530 can be indium tin oxide or the like.

[0098] In some embodiments of the present disclosure, Fig. 6AAs shown, the fourth electrode 530 is a grid-shaped electrode, and the orthographic projection of the fourth electrode 530 on the substrate 100 is located within the orthographic projection of the isolation structure 300 on the substrate 100, and the mesh of the fourth electrode 530 corresponds to the isolation opening 301. In this way, the selection of the conductive material of the fourth electrode 530 is not limited.

[0099] In at least one embodiment of the present disclosure, Fig. 6A As shown, the isolation structure 300 includes a support portion 310 and a crown portion 320, the support portion 310 is located between the crown portion 320 and the substrate 100, and the orthographic projection of the support portion 310 on the substrate 100 is located within the orthographic projection of the crown portion 320 on the substrate 100. In this way, the isolation structure 300 is generally in a shape of being wide at the top and narrow at the bottom, thereby improving the isolation effect of the isolation structure 300 on some film layers in the light-emitting device 200 (such as the light-emitting functional layer 220 described below or some film layers included therein).

[0100] In at least one embodiment of the present disclosure, Fig. 6A As shown, the second electrode 230 is electrically connected to the side wall of the support portion 310, and at least a portion of the support portion 310 is a conductive structure. In this way, the second electrodes 230 can be connected through the isolation structure 300 to reduce the voltage drop when the second electrodes 230 are driven. In addition, the current (crosstalk current) escaping from the light-emitting device 200 will preferentially enter the isolation structure 300 and be conducted out, thereby reducing the risk of the current entering other adjacent light-emitting devices 200 to alleviate the current crosstalk problem.

[0101] For example, the first functional layer 221 is the film layer that causes the most current crosstalk. The first functional layer 221 will be disconnected at the edge of the crown 320 during the evaporation process, that is, the first functional layer 221 will not be connected to the conductive part of the isolation structure 300 (such as the support part 310) to cause crosstalk between adjacent light-emitting devices 200. In addition, since the thickness of the support part 310 can be much greater than the thickness of the second electrode 230, it is easier for the current to enter the support part 310 and be conducted along the support part 310 than the second electrode 230. In this way, even if the first functional layer 221 contacts the support part 310, its current will be conducted along the support part 310 and is difficult to enter the adjacent light-emitting device 200, so that the risk of current crosstalk can be further reduced.

[0102] For example, in at least one embodiment of the present disclosure, by controlling the evaporation angle of some film layers forming the light-emitting functional layer 220, these film layers can be spaced apart from the support portion of the isolation structure, thereby further improving the isolation effect of the isolation structure. Fig.11 The relevant descriptions in the relevant embodiments are not repeated here.

[0103] In the embodiments of the present disclosure, as long as the electrochromic structure 500 is located on the side of the isolation structure 300 away from the substrate 100, on this basis, there is no restriction on the arrangement relationship between the electrochromic structure 500 and the isolation structure 300 and other nearby structures such as the first encapsulation layer, and the specific design can be based on actual needs. In the following, several methods of the electrochromic structure 500 are described through different embodiments.

[0104] In some embodiments of the present disclosure, Fig. 6A As shown, adjacent packaging units 411 are spaced apart from each other, and the electrochromic structure 500 is located in the gap between adjacent packaging units 411. The specific preparation process under this scheme can be referred to below. FIG. 9A to FIG. 9J The relevant descriptions in the relevant embodiments are not repeated here.

[0105] Alternatively, in another embodiment, Figure 6B As shown, part of the light emitting device 200 (for example, a light emitting device of any light emitting color, Figure 4B The encapsulation unit 411 corresponding to the light emitting device (shown as a light emitting device emitting red light R) covers at least a portion of the surface of the adjacent isolation structure 300 away from the substrate 100. On the side of the isolation structure 300 away from the substrate 100, the electrochromic structure 500 is located on the surface of the encapsulation unit 411 away from the substrate. The specific preparation process under this scheme can be referred to below. FIG. 10A to FIG. 10D The relevant descriptions in the relevant embodiments are not repeated here.

[0106] It should be noted that in Figure 6B In the structure shown, the encapsulation unit 411 can be used to isolate the connection between the electrochromic structure 500 and the isolation structure 300 to reduce the risk of electrical connection between the electrochromic structure 500 and the isolation structure 300 .

[0107] In at least one embodiment of the present disclosure, Figure 7 As shown, the isolation structure 300 includes a bottom 340, which is a conductive structure and is located between the substrate 100 and the support portion 310. The orthographic projection of the support portion 310 on the substrate 100 is located within the orthographic projection of the bottom 340 on the substrate 100, and the second electrode 230 is electrically connected to a portion of the surface of the bottom 340 that is away from the substrate 100 and is not covered by the support portion 310. Compared with the sidewall of the support portion 310, the second electrode 230 is more easily deposited on the surface of the bottom 340 that is away from the substrate 100. In this way, by providing the bottom 340, the impedance at the connection between the isolation structure 300 and the second electrode 230 can be reduced.

[0108] For example, the orthographic projection of the bottom 340 on the substrate 100 is located within the orthographic projection of the crown 320 on the substrate 100. In this way, the isolation effect of the isolation structure 300 (crown 320) on part of the film layer in the light-emitting device 200 can be ensured.

[0109] For example, the bottom 340, the support portion 310 and the crown portion 320 can be made of molybdenum, aluminum and titanium respectively. The corrosion resistance of aluminum, molybdenum and titanium increases in sequence. When etching, the film layers formed by these materials can form a Figure 7 An isolation structure 300 is shown.

[0110] In an embodiment of the present disclosure, the isolation structure is used to connect the second electrode. In order to avoid the isolation structure from being connected to the first electrode, the size of the first electrode can be reduced to be spaced apart from the isolation structure, or an insulating layer can be provided between the first electrode and the isolation structure.

[0111] In at least one embodiment of the present disclosure, it is possible to refer to Figure 3 The display panel includes a pixel defining layer 330 located between the substrate 100 and the isolation structure 300. The pixel defining layer 330 defines a plurality of pixel openings 302 corresponding to the isolation openings 301, and the pixel openings 302 are connected to the corresponding isolation openings 301 to limit the light emitting device 200. For example, the orthographic projection of the pixel opening 302 on the substrate 100 is located within the orthographic projection of the corresponding isolation opening 301 on the substrate 100, and the light emitting function layer 220 and the second electrode 230 fill the pixel opening 302 and extend to the surface of the pixel defining layer 330 away from the substrate 100.

[0112] In at least one embodiment of the present disclosure, the first electrode 210 is located between the pixel defining layer 330 and the substrate 100, and the pixel defining layer 330 covers the edge of the first electrode 210. In the case where the pixel defining layer 330 is provided in the display panel, the first electrode 210 of the light-emitting device 200 can be designed to have a larger area, so as to avoid positional offset (error caused by process accuracy) between the first electrode 210 and the isolation structure 300 in the actual process, which makes it difficult to ensure the actual light-emitting area of ​​the light-emitting device, thereby improving the aperture ratio (related to the light-emitting area of ​​the light-emitting device) and brightness of the display image of the display panel. For example, in the case where the pixel defining layer 330 is not provided, in order to avoid the first electrode 210 from being connected to the isolation structure 300, the design area of ​​the first electrode 210 is limited. If the position of the first electrode 210 is offset, the light-emitting area of ​​the light-emitting device may be smaller than the design area (the light-emitting area expected during design), thereby reducing the brightness of the light-emitting device.

[0113] In the embodiment of the present disclosure, the isolation structure 300 may be located on a side of the pixel defining layer 330 that is away from the substrate 100. Fig. 6AAs shown; alternatively, an opening for accommodating the isolation structure 300 may be provided in the pixel defining layer 330 to reduce the overall height of the isolation structure 300 (the distance from the surface facing away from the substrate to the substrate), so as to increase the viewing angle of the display panel while facilitating a thin and light design of the display panel.

[0114] For example, the pixel defining layer 330 may be an inorganic film layer. In the embodiment of the present disclosure, the light-emitting functional layer 220 and the second electrode 230 of the light-emitting device 200 may be formed by evaporation based on the isolation structure 300, and the isolation structure 300 may limit the light-emitting functional layer 220 and the second electrode 230, therefore, the pixel defining layer 330 does not need to have a large thickness to accommodate the light-emitting functional layer 220, that is, the pixel defining layer 330 does not need to be made of organic materials; in addition, the pixel defining layer 330 may have a smaller thickness when it is an inorganic layer, thereby reducing the step difference at the edge of the pixel opening 302, so as to improve the film continuity of the second electrode 230 at that location, so as to reduce the impedance of the second electrode 230, thereby ensuring the display effect of the display panel.

[0115] In at least one embodiment of the present disclosure, Figure 7 As shown, the substrate 100 may include a substrate and a driving circuit layer located on the substrate, the driving circuit layer includes a plurality of pixel driving circuits located in the display area, and the display function layer is located on the driving circuit layer. For example, the pixel driving circuit may include a plurality of transistors TFT, capacitors, etc., for example, formed in various forms such as 2T1C (i.e., 2 transistors (TFT) and 1 capacitor (C)), 3T1C or 7T1C. The pixel driving circuit is connected to the light emitting device 200 to control the switching state and the light emitting brightness of the light emitting device 200.

[0116] At least one embodiment of the present disclosure provides a display panel. Figure 3The display panel includes a substrate 100, an isolation structure 300, an electrochromic structure 500 and a plurality of light-emitting devices 200 located on the substrate 100. Each light-emitting device 200 includes a first electrode 210, a light-emitting functional layer 220 and a second electrode 230 sequentially stacked on the substrate 100, the isolation structure 300 is located on the substrate 100 and defines a plurality of isolation openings 301 corresponding to the light-emitting devices 200, respectively, the light-emitting functional layer 220 and the second electrode 230 of the light-emitting device 200 are located in the corresponding isolation openings 301, the electrochromic structure 500 is located on the side of the isolation structure 300 away from the substrate 100, and includes a third electrode 510 and an electrochromic layer 520, the orthographic projection of the electrochromic structure 500 on the substrate 100 is located within the orthographic projection of the isolation structure 300 on the substrate 100, and the third electrode 510 is in the same layer and the same material as the second electrode 230. In the display panel, the third electrode 510 can be simultaneously prepared in the process of preparing the light emitting device 200 using the isolation structure 300, thereby reducing the process flow of the display panel to control the cost; in addition, this method can accurately control the formation position of the third electrode 510 to ensure that the third electrode 510 is formed at the gap between the light emitting devices 200 to ensure the display effect of the display panel. The structure and further design of the display panel can refer to the relevant description in the above-mentioned embodiment, and will not be repeated here.

[0117] At least one embodiment of the present disclosure provides a method for preparing the above-mentioned display panel, which may include: Figure 8 Steps S100 to S700 are specifically as follows.

[0118] S100 , providing a substrate and forming a plurality of first electrodes on the substrate.

[0119] S200 , forming an isolation structure on the substrate on which the first electrode is formed, wherein the isolation structure defines a plurality of isolation openings corresponding to the first electrodes respectively.

[0120] S300, depositing a light-emitting functional material layer and a conductive material layer in sequence to cover the isolation structure and the isolation opening.

[0121] S400 , sequentially forming a packaging material layer on a side of the conductive material layer facing away from the substrate.

[0122] S500, performing a composition process on the light-emitting functional material layer, the conductive material layer, and the packaging material layer to remove the light-emitting functional material layer, the conductive material layer, and the packaging material layer corresponding to a part of the isolation opening, wherein the remaining light-emitting functional material layer forms a light-emitting functional layer, the remaining conductive material layer forms a second electrode, and the remaining packaging material layer forms a packaging unit, and the light-emitting functional layer and the second electrode and the first electrode corresponding to the isolation opening constitute a light-emitting device.

[0123] S600, repeating the above-mentioned process of preparing the light-emitting functional layer, the second electrode and the packaging unit in batches at the isolation openings where the light-emitting functional layer is not formed, until a light-emitting device and a packaging unit are formed at each isolation opening, wherein in the process of forming any batch of light-emitting devices, the portion of the conductive material layer overlapping with the isolation structure is retained to form a third electrode.

[0124] S700, depositing an electrochromic material layer, and performing a patterning process on the electrochromic material layer to form an electrochromic layer corresponding to the third electrode, wherein the third electrode and the electrochromic layer constitute an electrochromic structure, and the orthographic projection of the electrochromic structure on the substrate is located within the orthographic projection of the isolation structure on the substrate.

[0125] In the above-mentioned preparation method, the third electrode can be prepared simultaneously during the process of preparing the light-emitting device using the isolation structure, thereby reducing the process flow of the display panel to control costs; in addition, this method can accurately control the formation position of the third electrode to ensure that the third electrode is formed in the gap of the light-emitting device, thereby ensuring the display effect of the display panel.

[0126] The specific structural design of the display panel obtained by the preparation method corresponding to the above steps S100 to S500, as well as the arrangement relationship between the various components in the display panel and other components included therein, can be found in the relevant descriptions in the above embodiments and will not be elaborated here.

[0127] Next, prepare Fig. 6A Taking the display panel shown as an example, the principle of preparing the light-emitting device of the display panel based on the isolation structure and other process steps are exemplarily described.

[0128] like Fig.9A As shown, a substrate 100 is provided and first electrodes 210 arranged in an array are formed on the substrate 100 , and a pixel defining material layer 330 a is deposited on the substrate 100 on which the first electrodes 210 are formed.

[0129] like Fig. 9B As shown, a support portion 310 and a crown portion 320 are formed on the display panel, and the support portion 310 and the crown portion 320 define a plurality of isolation openings 301 and constitute an isolation structure 300 .

[0130] like Fig. 9C As shown, the insulating material film layer is patterned to form a pixel defining layer 330 (with a grid-like planar shape). The pixel defining layer 330 covers the gaps between adjacent first electrodes 210 . Thus, the pixel defining layer 330 has a grid-like planar shape.

[0131] In an embodiment of the present disclosure, the patterning process may be a photolithography patterning process, which may include, for example, coating a photoresist on a structure layer to be patterned, exposing the photoresist using a mask, developing the exposed photoresist to obtain a photoresist pattern, etching the structure layer using the photoresist pattern (optionally wet etching or dry etching), and then optionally removing the photoresist pattern. It should be noted that, in the case where the material of the structure layer (such as the photoresist pattern 700 described below) includes photoresist, the structure layer may be directly exposed through a mask to form a desired pattern.

[0132] like Fig.9D As shown, the light-emitting functional layer 220 and the second electrode 230 are evaporated on the substrate 100 to form a light-emitting device 200 in each isolation opening 301 of the isolation structure 300. No mask plate is used in the evaporation in this process, so the evaporated material will also be deposited on the crown 320. It should be noted that in the actual process, the evaporated material will be deposited on the upper surface of the crown 320 away from the substrate 100 and the side wall (not shown in the figure).

[0133] For example, the light-emitting layer in the evaporated light-emitting functional layer 220 may emit red light (R), that is, at this stage, a light-emitting device 200 emitting red light is formed in each isolation opening 301 of the isolation structure 300 .

[0134] like Fig.9E As shown, a first encapsulation film 410a is deposited to cover the light-emitting device 200 and the isolation structure 300; a photoresist is formed (e.g., coated) on the substrate 100 on which the first encapsulation film 410a is formed, and then a composition process is performed to form a photoresist pattern 700, wherein the photoresist pattern 700 only covers a portion of the isolation opening 301 of the isolation structure 300, and the photoresist pattern 700 covers the edge area of ​​the isolation structure 300.

[0135] like Fig.9F As shown, the surface of the display panel is etched using the photoresist pattern 700 as a mask to remove the first encapsulation film 410a, the second electrode 230 and the light-emitting functional layer 220 that are not covered by the photoresist pattern 700, and the remaining part of the first encapsulation film 410a forms the encapsulation unit 411 of the first encapsulation layer 410; then the remaining photoresist pattern 700 is removed.

[0136] like Figure 9G As shown, repeat the above FIG. 9D to FIG. 9Fto respectively form a light-emitting device 200 emitting green light and a light-emitting device 200 emitting blue light in the other isolation openings 301, wherein when preparing the light-emitting device 200 emitting green light and / or the light-emitting device 200 emitting blue light, the material layer for forming the light-emitting functional layer 220 and the material layer for forming the second electrode 230 falling on the crown 320 can be retained, the portion of the material layer for forming the light-emitting functional layer 220 falling on the crown 320 forms the first filling layer 610, and the portion of the material layer for forming the second electrode 230 falling on the crown 320 forms the third electrode 510.

[0137] like Figure 9H As shown, an electrochromic layer 520 is formed on a side of the third electrode 510 facing away from the isolation structure 300 .

[0138] like Fig.9I As shown, a second filling layer 620 is formed in the groove 303 defined by the packaging unit 411 .

[0139] like Figure 9J As shown, a fourth electrode 530 is formed on a side of the electrochromic layer 520 that is away from the isolation structure 300 , and the third electrode 510 , the electrochromic layer 520 and the fourth electrode 530 constitute the electrochromic structure 500 .

[0140] like Figure 9J and Fig. 6A As shown, a second encapsulation layer 420 and a third encapsulation layer 430 are formed on the side of the fourth electrode 530 facing away from the substrate 100 , and the first encapsulation layer 410 , the second encapsulation layer 420 and the third encapsulation layer 430 constitute an encapsulation structure.

[0141] In addition, the preparation Figure 6B Taking the display panel shown as an example, the principle of preparing the light-emitting device of the display panel based on the isolation structure and other process steps are exemplarily described.

[0142] like Fig. 10A As shown, based on the description of the above embodiment, after obtaining Fig.9D After the display panel is shown, a first encapsulation film 410a is deposited to cover the light-emitting device 200 and the isolation structure 300; a photoresist is formed (e.g., coated) on the substrate 100 on which the first encapsulation film 410a is formed, and then a composition process is performed to form a photoresist pattern 700, wherein the photoresist pattern 700 only covers a portion of the isolation opening 301 of the isolation structure 300, and at the portion of the isolation opening 301, the photoresist pattern 700 covers the area on the surface of the isolation structure 300 adjacent to the portion of the isolation opening 301.

[0143] like Fig. 10BAs shown, the surface of the display panel is etched using the photoresist pattern 700 as a mask to remove the first encapsulation film 410a, the second electrode 230 and the light-emitting functional layer 220 that are not covered by the photoresist pattern 700, and the remaining part of the first encapsulation film 410a forms the encapsulation unit 411 of the first encapsulation layer 410; then the remaining photoresist pattern 700 is removed.

[0144] like Fig. 10C As shown, repeat the above-mentioned embodiment FIG. 9D to FIG. 9F Steps are performed to form a light emitting device 200 emitting green light and a light emitting device 200 emitting blue light in other isolation openings 301, respectively, wherein Fig. 10D As shown, when preparing a green light-emitting device 200 and / or a blue light-emitting device 200, the material layer for forming the light-emitting functional layer 220 and the material layer for forming the second electrode 230 that fall on the crown 320 can be retained, and the portion of the material layer for forming the light-emitting functional layer 220 that falls on the crown 320 forms the first filling layer 610, and the portion of the material layer for forming the second electrode 230 that falls on the crown 320 forms the third electrode 510.

[0145] like Fig.11 As shown, when evaporating the light-emitting functional layer (for example, the first functional layer), if the evaporation source P moves to face the isolation structure 300, the boundary of the evaporation angle corresponds to the line L1 and the line L2 on the display panel, that is, the area between the line L1 and the line L2 will not be evaporated in this case, while the area on the side of the line L1 and the line L2 away from the isolation structure 300 will be evaporated no matter where the evaporation source P moves. That is, starting from the line L1 or the line L2 area, the closer to the isolation structure 300, the smaller the thickness of the light-emitting functional layer.

[0146] At least one embodiment of the present disclosure provides a display device, which can be the display panel in the above embodiment. For example, the display device may include a touch structure, an optical film (such as a microlens, a polarizer), a cover plate, and other structures arranged on the light-emitting side of the display panel.

[0147] For example, the display device may be any product or component having a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a notebook computer, a navigator, or the like.

[0148] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, etc. made within the spirit and principles of this specification should be included in the protection scope of this specification.

Claims

1. A display panel, characterized in that: include: substrate; A plurality of light emitting devices are located on the substrate; A packaging structure, located on a side of the light emitting device away from the substrate; as well as The electrochromic structure is located between the packaging structure and the substrate, wherein the orthographic projection of the electrochromic structure on the substrate is located within the orthographic projection of the gap of the light-emitting device on the substrate.

2. The display panel according to claim 1, characterized in that: Also included is an isolation structure located on the substrate, wherein the isolation structure defines a plurality of isolation openings that respectively define the light emitting devices, and At least part of the packaging structure is located on a side of the isolation structure away from the substrate, the electrochromic structure is located between the packaging structure and the isolation structure, and the orthographic projection of the electrochromic structure on the substrate is located within the orthographic projection of the isolation structure on the substrate.

3. The display panel according to claim 2, characterized in that: The light emitting device comprises a first electrode, a light emitting functional layer and a second electrode which are sequentially stacked on the substrate. The light-emitting functional layer and the second electrode of the light-emitting device are located within the corresponding isolation openings.

4. The display panel according to claim 3, characterized in that: The electrochromic structure includes a third electrode and an electrochromic layer which are stacked.

5. The display panel according to claim 4, characterized in that: The third electrode is located between the electrochromic layer and the isolation structure, and the third electrode is in the same layer and made of the same material as the second electrode in at least one of the light-emitting devices; Preferably, the light emitting devices are classified into a plurality of types with different light emission colors, and the third electrode is in the same layer and made of the same material as the second electrode in the light emitting device with one light emission color; Preferably, the display panel comprises a display area, a non-display area, and a first signal line and a second signal line arranged in the non-display area, the light emitting device is located in the display area, the first signal line is electrically connected to the isolation structure, and the second signal line is electrically connected to the third electrode; Further preferably, the first signal line and the second signal line are in the same layer and made of the same material, the display panel includes a switching line located in the non-display area, the switching line is in the same layer and made of the same material as the third electrode, and the second signal line is electrically connected to the third electrode through the switching line.

6. The display panel according to claim 5, characterized in that: It also includes a first filling layer, wherein the first filling layer is located between the third electrode and the isolation structure, and the first filling layer is in the same layer and made of the same material as at least a portion of the light-emitting functional layer.

7. The display panel according to claim 6, characterized in that: The light-emitting devices are classified to emit light of multiple colors, and at least a part of the light-emitting functional layers of the light-emitting devices emitting light of different colors are made of different materials, and The light emitting functional layer on the same layer as the first filling layer has the same light emitting color.

8. The display panel according to claim 4, characterized in that: The electrochromic structure further includes a fourth electrode, and the electrochromic layer is located between the fourth electrode and the third electrode.

9. The display panel according to claim 8, characterized in that: The fourth electrode covers the isolation structure and the light-emitting device, and the fourth electrode is a transparent electrode; or The fourth electrode is a grid-shaped electrode, and the orthographic projection of the fourth electrode on the substrate is located within the orthographic projection of the isolation structure on the substrate.

10. The display panel according to any one of claims 2 to 9, characterized in that: The packaging structure includes a first packaging layer covering the light-emitting device, the first packaging layer includes a plurality of packaging units corresponding to the light-emitting devices respectively, and the packaging units cover the isolation openings; Preferably, the packaging unit extends to a side of the isolation structure away from the substrate, and at least a portion of an edge portion of the packaging unit is spaced from the isolation structure on the side of the isolation structure away from the substrate to form a suspended portion; Further preferably, adjacent packaging units are spaced apart from each other, and the electrochromic structure is located in a gap between adjacent packaging units; or The packaging unit corresponding to a part of the light-emitting devices covers the surface of the adjacent isolation structure away from the substrate, and the electrochromic structure is located on the surface of the packaging unit away from the substrate on the side of the isolation structure away from the substrate; Further preferably, the display panel comprises a second encapsulation layer and a third encapsulation layer covering the first encapsulation layer, the second encapsulation layer is located between the first encapsulation layer and the third encapsulation layer, and the electrochromic structure is located between the second encapsulation layer and the isolation structure; Still further preferably, the second encapsulation layer is an organic film layer, and the first encapsulation layer and the third encapsulation layer are inorganic film layers.

11. The display panel according to claim 10, characterized in that: The portion of the first encapsulation layer covering the isolation opening forms a groove, and the display panel further includes a second filling layer, and The second filling layer fills the groove, and a refractive index of the second filling layer is greater than a refractive index of the first packaging layer.

12. The display panel according to claim 11, characterized in that: The second filling layer includes filling units corresponding to the isolation openings respectively, and the filling units fill the grooves; Preferably, the surface of the filling unit facing away from the substrate is flush with the surface of the electrochromic layer facing away from the substrate, or the distance from the surface of the filling unit facing away from the substrate to the surface of the substrate is smaller than the distance from the surface of the electrochromic layer facing away from the substrate to the surface of the substrate.

13. The display panel according to any one of claims 3 to 9, characterized in that: The isolation structure comprises a support portion and a crown portion, wherein the support portion is located between the crown portion and the substrate, and an orthographic projection of the support portion on the substrate is located within an orthographic projection of the crown portion on the substrate; Preferably, the second electrode is electrically connected to a side wall of the support portion, and at least a portion of the support portion is a conductive structure.

14. The display panel according to claim 13, characterized in that: The isolation structure includes a bottom portion, the bottom portion is a conductive structure and is located between the substrate and the support portion, and The orthographic projection of the support portion on the substrate is located within the orthographic projection of the bottom portion on the substrate, and the second electrode is electrically connected to a portion of a surface of the bottom portion that is away from the substrate and is not covered by the support portion; Preferably, the orthographic projection of the bottom portion on the base plate is located within the orthographic projection of the crown portion on the base plate.

15. The display panel according to any one of claims 3 to 7, characterized in that: The display panel includes a pixel defining layer located between the substrate and the isolation structure, and The pixel defining layer defines a plurality of pixel openings corresponding to the isolation openings respectively, and the pixel openings are connected to the corresponding isolation openings to limit the light emitting device; Preferably, the pixel defining layer is an inorganic layer.

16. A display panel, characterized in that: include: substrate; A plurality of light-emitting devices are located on the substrate, and each of the light-emitting devices comprises a first electrode, a light-emitting functional layer and a second electrode sequentially stacked on the substrate; an isolation structure, located on the substrate and defining a plurality of isolation openings corresponding to the light-emitting devices, wherein the light-emitting functional layer and the second electrode of the light-emitting device are located in the corresponding isolation openings; as well as The electrochromic structure is located on a side of the isolation structure away from the substrate, and comprises a third electrode and an electrochromic layer, wherein the orthographic projection of the electrochromic structure on the substrate is within the orthographic projection of the isolation structure on the substrate, and the third electrode is in the same layer and made of the same material as the second electrode.

17. The display panel according to claim 16, characterized in that: It also includes a first filling layer, wherein the first filling layer is located between the third electrode and the isolation structure, and the first filling layer is in the same layer and made of the same material as the light-emitting functional layer; Preferably, the light emitting devices are classified to emit light of multiple colors, and at least part of the light emitting functional layers of the light emitting devices emitting light of different colors are made of different materials, and the light emitting functional layers of the light emitting devices in the same layer as the first filling layer have the same light emitting color; Preferably, the electrochromic structure further comprises a fourth electrode, and the electrochromic layer is located between the fourth electrode and the third electrode; Further preferably, the fourth electrode covers the isolation structure and the light-emitting device, and the fourth electrode is a transparent electrode; or The fourth electrode is a grid-shaped electrode, and the orthographic projection of the fourth electrode on the substrate is located within the orthographic projection of the isolation structure on the substrate.

18. The display panel according to claim 16 or 17, characterized in that: Also included is a packaging structure, wherein the packaging structure is located on a side of the light-emitting device and the isolation structure away from the substrate, and the electrochromic structure is located between the packaging structure and the isolation structure; Preferably, the encapsulation structure comprises a first encapsulation layer covering the light-emitting device, the first encapsulation layer comprises a plurality of encapsulation units respectively corresponding to the light-emitting devices, and the encapsulation units cover the isolation openings; Preferably, a portion of the first encapsulation layer covering the isolation opening forms a groove, and the display panel further comprises a second filling layer, which fills the groove, and a refractive index of the second filling layer is greater than that of the first encapsulation layer.

19. A display device, characterized in that: A display panel comprising any one of claims 1 to 18.

20. A method for preparing a display panel, characterized in that: include: providing a substrate and forming a plurality of first electrodes on the substrate; forming an isolation structure on the substrate on which the first electrode is formed, wherein the isolation structure defines a plurality of isolation openings respectively corresponding to the first electrodes; Depositing a light-emitting functional material layer and a conductive material layer in sequence to cover the isolation structure and the isolation opening; sequentially forming a packaging material layer on a side of the conductive material layer away from the substrate; Performing a patterning process on the light-emitting functional material layer, the conductive material layer, and the packaging material layer to remove a portion of the light-emitting functional material layer, the conductive material layer, and the packaging material layer corresponding to the isolation opening, wherein the remaining light-emitting functional material layer forms a light-emitting functional layer, the remaining conductive material layer forms a second electrode, and the remaining packaging material layer forms a packaging unit, and the light-emitting functional layer and the second electrode and the first electrode corresponding to the isolation opening constitute a light-emitting device; Repeating the above process of preparing the light-emitting functional layer, the second electrode and the packaging unit in batches at the isolation opening where the light-emitting functional layer is not formed, until the light-emitting device and the packaging unit are formed at each isolation opening, wherein in the process of forming any batch of the light-emitting devices, a portion of the conductive material layer overlapping with the isolation structure is retained to form a third electrode; and An electrochromic material layer is deposited, and the electrochromic material layer is patterned to form an electrochromic layer corresponding to the third electrode, wherein the third electrode and the electrochromic layer constitute an electrochromic structure, and the orthographic projection of the electrochromic structure on the substrate is within the orthographic projection of the isolation structure on the substrate.

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