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 light-emitting device layer, a color film layer, a micro-lens layer and a positioning mark layer, wherein the light-emitting device layer, the color film layer, the micro-lens layer and the positioning mark layer are arranged on the substrate. The light-emitting device layer comprises a pixel defining layer and a plurality of light-emitting devices, the pixel defining layer is provided with a plurality of pixel openings, the color film layer comprises a plurality of color filtering areas, the micro lens layer comprises a plurality of micro lenses, and the positioning mark layer comprises a plurality of positioning mark parts. The orthographic projection of the positioning marking part on the substrate is located between the orthographic projections of the two adjacent micro lenses on the substrate.

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] With the continuous development of display technology, silicon-based OLED (Organic Light Emitting Diode) display products have attracted widespread attention due to their advantages such as high resolution, low power consumption, small size and light weight. They have good application prospects in high-resolution near-eye display industries such as wearable devices, industrial security, and medical treatment, and are developing towards high color gamut and high brightness. Summary of the invention

[0003] The embodiments of the present disclosure provide a display panel and a display device, which can quickly locate the center line of the microlens of the display panel at least to a certain extent, so as to confirm the morphological characteristics of the microlens.

[0004] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a display panel, including:

[0006] A substrate, comprising a plurality of sub-pixel regions;

[0007] A light-emitting device layer, arranged on one side of the base substrate, comprising a pixel defining layer and a plurality of light-emitting devices, wherein the pixel defining layer is provided with a plurality of pixel openings, and the pixel openings are configured to define light-emitting areas of the light-emitting devices, and the orthographic projection of the light-emitting area of ​​each light-emitting device on the base substrate is located within one of the sub-pixel areas;

[0008] A color filter layer, arranged on a side of the light-emitting device layer away from the base substrate, comprising a plurality of color filter regions, wherein the orthographic projection of each color filter region on the base substrate covers the orthographic projection of a light-emitting region of the light-emitting device on the base substrate;

[0009] A microlens layer, arranged on a side of the color filter layer away from the base substrate, comprising a plurality of microlenses, wherein the orthographic projection of the microlenses on the base substrate covers the orthographic projection of the light emitting area of ​​at least one light emitting device on the base substrate;

[0010] The positioning mark layer is arranged on the side of the base substrate close to the microlens layer, and includes a plurality of positioning mark parts, the orthographic projections of the positioning mark parts on the base substrate are located between the orthographic projections of two adjacent microlenses on the base substrate.

[0011] In combination with the first aspect of the present disclosure, in some embodiments, the line connecting the center points of the orthographic projections of two adjacent microlenses on the substrate is a first center line, the orthographic projection of the first positioning mark portion on the substrate is a first projection area, and the first center line passes through the first projection area, wherein the first positioning mark portion is a positioning mark portion whose orthographic projection on the substrate is located between the orthographic projections of two adjacent microlenses on the substrate corresponding to the first center line.

[0012] In combination with the first aspect of the present disclosure, in some embodiments, the center point of the first projection area is located on the first center line.

[0013] In combination with the first aspect of the present disclosure, in some embodiments, the first projection area is an axisymmetric figure, the first projection area includes a first axis of symmetry, and the first axis of symmetry substantially coincides with the first center line.

[0014] In combination with the first aspect of the present disclosure, in some embodiments, a line connecting the center points of the orthographic projections of three adjacent microlenses arranged in the same direction on the base substrate is a second center line, the orthographic projection of the second positioning mark portion on the base substrate is a second projection area, the orthographic projection of the third positioning mark portion on the base substrate is a third projection area, and the second positioning mark portion and the third positioning mark portion are positioning mark portions whose orthographic projections on the base substrate are located between the orthographic projections of the three adjacent microlenses on the base substrate;

[0015] The line connecting the center points of the second projection area and the third projection area is the third center line, and the third center line roughly coincides with the second center line; or, the center point of the second projection area and the center point of the third projection area are respectively located on both sides of the second center line.

[0016] In combination with the first aspect of the present disclosure, in some embodiments, the second center line passes through the second projection area and the third projection area, the second projection area includes a first edge and a second edge arranged opposite to each other, the third projection area includes a third edge and a fourth edge arranged opposite to each other, the first edge and the third edge are located on a first side of the second center line, the second edge and the fourth edge are located on a second side of the second center line, and along a direction parallel to the substrate and perpendicular to the second center line, the distance between the second edge and the third edge is 0 to 0.5 microns.

[0017] In combination with the first aspect of the present disclosure, in some embodiments, the first projection area is located between two adjacent sub-pixel areas, and the orthographic projection of the pixel opening on the substrate does not overlap with the first projection area.

[0018] In combination with the first aspect of the present disclosure, in some embodiments, a boundary line between two sub-pixel areas adjacent to the first projection area passes through a center point of the first projection area.

[0019] In combination with the first aspect of the present disclosure, in some embodiments, along the extension direction of the first center line, the length of the first projection area is 0.1 to 2 microns.

[0020] In combination with the first aspect of the present disclosure, in some embodiments, along a direction perpendicular to the first center line, a width of the first projection area is 0.05 to 0.5 micrometers.

[0021] In combination with the first aspect of the present disclosure, in some embodiments, along a direction perpendicular to the base substrate, a thickness of the positioning mark portion is 0.05 to 1 micrometer.

[0022] In combination with the first aspect of the present disclosure, in some embodiments, the light emitting device includes a first electrode layer, a light emitting layer, and a second electrode layer sequentially stacked on the base substrate, and the display panel further includes:

[0023] An encapsulation layer is arranged on a side of the second electrode layer away from the base substrate;

[0024] A first protective layer, disposed between the encapsulation layer and the color filter layer;

[0025] A second protective layer, disposed between the color filter layer and the microlens layer;

[0026] Wherein, the positioning mark layer is arranged on a side of the second protective layer close to the microlens layer, a gap exists between two adjacent microlenses, and the positioning mark portion is located at the gap; or,

[0027] The positioning mark layer is arranged between the color filter layer and the second protective layer; or,

[0028] The positioning mark layer is disposed between the encapsulation layer and the first protective layer; or,

[0029] The positioning mark layer is disposed between the second electrode layer and the encapsulation layer.

[0030] In a second aspect of the present disclosure, a method for preparing a display panel is provided, comprising:

[0031] A light-emitting device layer is formed on one side of a base substrate, wherein the base substrate includes a plurality of sub-pixel regions, the light-emitting device layer includes a pixel defining layer and a plurality of light-emitting devices, the pixel defining layer is provided with a plurality of pixel openings, the pixel openings are configured to define light-emitting regions of the light-emitting devices, and the orthographic projection of the light-emitting region of each light-emitting device on the base substrate is located within one of the sub-pixel regions;

[0032] Forming a color filter layer on the light-emitting device layer, wherein the color filter layer includes a plurality of color filter regions, and the orthographic projection of each color filter region on the base substrate covers the orthographic projection of a light-emitting region of the light-emitting device on the base substrate;

[0033] Forming a microlens layer on the color filter layer, wherein the microlens layer includes a plurality of microlenses, and the orthographic projection of the microlenses on the base substrate covers the orthographic projection of the light emitting area of ​​at least one light emitting device on the base substrate;

[0034] A positioning mark layer is formed on one side of the base substrate close to the microlens layer. The positioning mark layer includes a plurality of positioning mark portions. The orthographic projections of the positioning mark portions on the base substrate are located between the orthographic projections of two adjacent microlenses on the base substrate.

[0035] In a third aspect of the present disclosure, a display device is provided, comprising the display panel provided in the first aspect of the present disclosure.

[0036] In the display panel provided by some embodiments of the present disclosure, a positioning mark layer is provided on a side of the base substrate close to the microlens layer, and the orthographic projection of a positioning mark portion in the positioning mark layer on the base substrate is located between the orthographic projections of two adjacent microlenses on the base substrate. The center line of the microlens can be determined by the positions of the two positioning mark portions between three adjacent microlenses arranged in the same direction, thereby determining the morphological features of the microlens based on the center line of the microlens.

[0037] The above description is only an overview of the technical solution provided by the embodiment of the present disclosure. In order to more clearly understand the technical means of the embodiment of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present disclosure more obvious and easy to understand, the specific implementation method of the embodiment of the present disclosure is listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0039] Figure 1 A schematic diagram of the structure of a display screen in the related art is shown;

[0040] Figure 2 A partial top view schematic diagram of a display panel in the related art is shown;

[0041] Figure 3 A schematic diagram showing the structure of a display panel according to some embodiments of the present disclosure is shown;

[0042] Figure 4 A schematic diagram showing the structure of a display panel according to some embodiments of the present disclosure is shown;

[0043] Figure 5 A schematic diagram showing the structure of a display panel according to some embodiments of the present disclosure is shown;

[0044] Figure 6 A schematic diagram showing the structure of a display panel according to some embodiments of the present disclosure is shown;

[0045] Figure 7 A partial top view schematically shows a display panel of some embodiments of the present disclosure;

[0046] Figure 8 A partial top view schematically shows a display panel of some embodiments of the present disclosure;

[0047] Fig. 9 A partial top view schematically shows a display panel of some embodiments of the present disclosure;

[0048] Fig.10 A partial top view schematically shows a display panel of some embodiments of the present disclosure;

[0049] Fig.11 A partial top view schematically shows a display panel of some embodiments of the present disclosure;

[0050] Fig.12 A partial top view schematically shows a display panel of some embodiments of the present disclosure;

[0051] Fig.13 A partial top view schematically shows a display panel of some embodiments of the present disclosure;

[0052] Fig.14 A partial top view schematically shows a display panel of some embodiments of the present disclosure;

[0053] Fig.15 A partial top view schematically shows a display panel of some embodiments of the present disclosure;

[0054] Fig.16 A flow chart showing a method for preparing a display panel according to some embodiments of the present disclosure is shown;

[0055] Fig.17 A schematic structural diagram of a display device according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0056] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0057] It should be noted that the term "and / or" used herein is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The term "plurality" used herein includes two or more than two.

[0058] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0059] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, the difference between the two equalities is less than or equal to 5% of either one.

[0060] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0061] With the gradual development of AR (Augmented Reality) / VR (Virtual Reality), silicon-based OLED has gradually emerged as the best display device for AR / VR. OLED, or organic light-emitting diode, uses organic light-emitting materials as the light source. Since VR / AR immersive head-mounted devices require high brightness, a brightening microlens design will be added to the screen design. Since the shape of the microlens is similar to a hemisphere, when the actual design is completed and the production effect is confirmed, it is impossible to accurately and quickly find its center line by grinding and other methods, confirm the morphological characteristics of the microlens, including the height and width of the microlens and the angle of the side wall, etc., which brings great troubles and errors to the design work and greatly reduces the efficiency of the design work. Therefore, a design is urgently needed to improve this situation.

[0062] Figure 1 A schematic diagram of an OLED display screen module in the related art is shown. Figure 2 Shows Figure 1 A schematic top view of a pixel-level magnified display area 101 is shown. The display area 101 includes a plurality of sub-pixel areas 102 arranged in an array and a plurality of micro-lenses 103 arranged in an array, including micro-lenses 103a, 103b and 103c. In order to determine the morphological features of the micro-lenses 103a, 103b and 103c, it is necessary to locate the center line 104.

[0063] Figure 3 FIG. 1 is a schematic diagram showing the structure of a display panel 10 according to some embodiments of the present disclosure. Figure 3 As shown, the display panel 10 includes a base substrate 100 and a pixel defining layer 111 , a light emitting device 112 , a color filter layer 130 and a microlens layer 160 arranged on one side of the base substrate 100 .

[0064] In some embodiments, the base substrate 100 may be a silicon substrate including a pixel driving circuit (not shown in the figure). For example, each sub-pixel region is provided with a pixel driving circuit of a sub-pixel.

[0065] In a direction away from the base substrate 100, the light-emitting device 112 includes a first electrode layer 113, a light-emitting layer 114, and a second electrode 115 which are stacked in sequence. In some embodiments, the light-emitting layer 114 may include a light-emitting material layer (EML) and a functional material layer. For example, the functional material layer may include: a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). It should be noted that for the top-emitting light-emitting device 112, the first electrode 113 has a reflective property, and the second electrode 115 can partially transmit and partially reflect the light emitted by the light-emitting layer 114, so that the light-emitting device 112 can achieve a strong microcavity effect and achieve a better color gamut and luminous efficiency.

[0066] The first electrode 113 may include an electrode functional layer and an electrode reflective layer. The electrode functional layer is determined according to the polarity of the first electrode 113. The electrode reflective layer is a material film layer with reflective properties, for example, a metal film. Taking the first electrode 113 as an anode and the second electrode 115 as a cathode as an example, the electrode functional layer includes a material film layer with a higher work function. In some embodiments, the first electrode 113 may be a composite structure composed of a transparent conductive oxide film and a metal film stack. Among them, the material of the transparent conductive oxide film is, for example, any one of ITO (full name in English: Indium tin oxide, Chinese name: indium tin oxide) and IZO (full name in English: Indium zinc oxide, Chinese name: indium zinc oxide), and the material of the metal film may be, for example, any one or more of aluminum (Al), silver (Ag), titanium (Ti), molybdenum (Mo), etc. Exemplarily, the first electrode 113 may be a composite structure composed of ITO / Ag / ITO / Al stacked.

[0067] The pixel defining layer 111 is stacked on the side of the first electrode 113 away from the base substrate 100, and the pixel defining layer 111 has a plurality of pixel openings. Each pixel opening is configured to define a light-emitting area of ​​a light-emitting device 112. Each pixel opening exposes at least a portion of the first electrode 113 of the corresponding light-emitting device 112, and at least a portion of the light-emitting layer 114 is located in the corresponding pixel opening and is electrically connected to the corresponding first electrode 113. In some embodiments, the orthographic projection of the pixel opening on the base substrate 100 is located within the orthographic projection range of the color filter area on the base substrate 100, that is, the color filter area covers the pixel opening and expands outward compared to the boundary of the pixel opening to ensure the light extraction efficiency of each sub-pixel.

[0068] In some embodiments, the second electrodes 115 of the plurality of light emitting devices 112 may be connected to each other. Figure 3The entire layer is arranged as shown in , so as to facilitate access to the signal of the second electrode 115. For example, the second electrode 115 may include a metal material, such as any one of lithium (Li), aluminum (Al), magnesium (Mg), silver (Ag), etc., or alloys of any of the above materials such as magnesium-silver alloy and aluminum-lithium alloy.

[0069] The color filter layer 130 is disposed on the side of the device encapsulation layer 120 away from the base substrate 100. The color filter layer 130 includes a plurality of color filter areas TA, and a light shielding area TN may be disposed between adjacent color filter areas TA, or may not be disposed. Figure 3 The corresponding embodiment takes the case where no light shielding area TN is provided between adjacent color filter areas TA as an example. The orthographic projection of each color filter area TA on the base substrate is located in a sub-pixel area. The color filter layer 130 includes a plurality of color filter units, and each sub-pixel may also include a color filter unit provided corresponding to the light-emitting device 112. For example, in the same sub-pixel, the orthographic projection of the geometric center point of the color filter unit on the base substrate 100 may coincide with the orthographic projection of the geometric center point of the light-emitting area of ​​the light-emitting device 112 on the base substrate 100. The light emitted by the light-emitting device 112 is filtered by the color filter unit and then output.

[0070] The display panel 10 may further include a microlens layer 160, which is disposed on the side of the color filter layer 130 away from the base substrate 100, and includes a plurality of first microlenses 161, wherein the orthographic projection of the first microlens 161 on the base substrate 100 covers the orthographic projection of the light-emitting region of at least one light-emitting device on the base substrate 100, so as to adjust the propagation direction of the light emitted by the light-emitting device. In some embodiments, the first microlens 161 is a focusing lens, for example, a convex lens or a Fresnel lens. When the first microlens 161 is a convex lens, the first microlens 161 may protrude in a direction away from the base substrate 100, and / or protrude in a direction close to the base substrate 100, so as to converge the light emitted by the light-emitting device, thereby achieving a brightness gain effect.

[0071] In some embodiments, the material of the first microlens 161 may be a resin material that can transmit multiple colors of visible light. The gap between two adjacent first microlenses 161 may be greater than 0 and smaller than the gap between two adjacent pixel openings 1110 .

[0072] like Figure 3 As shown, the display panel 10 further includes an encapsulation layer 120 , which is disposed on a side of the second electrode 115 away from the base substrate 100 and is configured to encapsulate the light-emitting device to prevent water and oxygen from penetrating into the light-emitting device.

[0073] The display panel 10 further includes a first protective layer 140 disposed between the encapsulation layer 120 and the color filter layer 130 and configured to prevent water and oxygen from penetrating into the light-emitting device.

[0074] The display panel 10 further includes a second protective layer 150 disposed between the color filter layer 130 and the microlens layer 160 and configured to block water and oxygen from penetrating into the color filter layer 130 and the light-emitting device. The color filter layer 130 is located between the first protective layer 140 and the second protective layer 150 .

[0075] like Figure 3 As shown, the cover plate 190 is disposed on a side of the second protective layer 150 away from the base substrate 100 , and the optical adhesive layer 180 is disposed between the cover plate 190 and the second protective layer 150 .

[0076] exist Figure 3 In a corresponding embodiment, the display panel 10 also includes a positioning mark layer 170, which is disposed on the side of the second protective layer 150 close to the microlens layer 160, and the orthographic projection of the positioning mark portion on the base substrate is located between the orthographic projections of two adjacent microlenses on the base substrate, and there is a gap 161 between the two adjacent microlenses, and the positioning mark portion 171 is located in the gap.

[0077] exist Figure 3 In the corresponding embodiment, the material of the positioning mark portion is different from the material of the optical adhesive layer 180, and the reflectivity of the material of the positioning mark portion is relatively large, which is convenient for observation. For example, the positioning mark portion can be a metal material, such as any one of lithium (Li), aluminum (Al), magnesium (Mg), silver (Ag) and other metal materials, or alloys of any of the above materials such as magnesium-silver alloy and aluminum-lithium alloy.

[0078] In this embodiment, the orthographic projection of the positioning mark on the substrate is located between the orthographic projections of two adjacent microlenses on the substrate, and the center line of the microlens can be determined by the positions of the two positioning marks between three adjacent microlenses arranged in the same direction, thereby determining the morphological characteristics of the microlens based on the center line of the microlens.

[0079] In other embodiments, the positioning mark layer may also be set in other layers.

[0080] In some embodiments, Figure 4 As shown, the positioning mark layer 170 can also be disposed between the color filter layer 130 and the second protective layer 150. Similarly, the material of the positioning mark portion is different from the material of the second protective layer 150, and the reflectivity of the material of the positioning mark portion is relatively large, which is convenient for observation. For example, the positioning mark portion can be made of metal material.

[0081] like Figure 5 As shown, in some embodiments, the positioning mark layer 170 can also be disposed between the encapsulation layer 120 and the first protective layer 140. Similarly, the material of the positioning mark portion is different from that of the first protective layer 140, and the reflectivity of the material of the positioning mark portion is relatively large, which is easy to observe.

[0082] like Figure 6 As shown, in some embodiments, the positioning mark layer 170 can also be disposed between the second electrode layer 115 and the encapsulation layer 120. Similarly, the material of the positioning mark portion is different from that of the encapsulation layer 120, and the reflectivity of the material of the positioning mark portion is relatively large, which is easy to observe.

[0083] It should be noted that Figures 4 to 6 The corresponding embodiments and Figure 3 The difference between the corresponding embodiments lies in the position of the positioning mark layer. Regarding the implementation of the light-emitting device layer 110, the first dimming layer 160, the second dimming layer 170, the color filter layer 130 and other structures, reference can be made to the description of the relevant embodiments above and will not be repeated here.

[0084] Specifically, along the direction perpendicular to the substrate, the thickness of the positioning mark portion is too small to make it difficult to identify the position, and too large a thickness may affect the effect of the encapsulation layer, the first protective layer or the second protective layer. In some possible embodiments, along the direction perpendicular to the substrate, the thickness of the positioning mark portion may be 0.05 to 1 micron.

[0085] Preferably, the thickness of the positioning mark portion may be 0.2 microns.

[0086] The above-mentioned embodiments illustrate the different levels at which the positioning mark portion may be located in combination with the cross-section of the display panel. The specific position of the positioning mark portion will be described below from a top view.

[0087] In some embodiments, Figure 7 As shown, the orthographic projections of the microlenses 161 on the base substrate are arranged in a mesh shape, and the orthographic projection 171 a of the positioning mark portion on the base substrate is located between the orthographic projections 161 a of two adjacent microlenses on the base substrate 100 .

[0088] For three microlenses arranged in the same direction, the center line of the microlens can be located by combining two positioning mark portions whose orthographic projections 171a are located between the orthographic projections 161a of every two adjacent microlenses on the substrate.

[0089] In some embodiments, Figure 8 As shown, the line connecting the center points 161b of the orthographic projections 161a of two adjacent microlenses on the substrate is the first center line 161c.

[0090] It can be understood that the microlens includes a bottom surface and a curved surface, and the center point 161b of the orthographic projection of the microlens on the substrate is actually the center point of the orthographic projection of the bottom surface of the microlens on the substrate.

[0091] The orthographic projection of the first positioning mark portion on the base substrate is a first projection area 171a, wherein the orthographic projection of the first positioning mark portion on the base substrate is located between the orthographic projections 161a of two adjacent microlenses corresponding to the first center line 161c on the base substrate.

[0092] Specifically, the first center line 161c passes through the first projection area 171a, wherein the first center line 161c passing through the first projection area 171a may include passing through the first projection area 171a, and may also include the first center line 161c intersecting with the boundary of the first projection area 171a. Then, through the first positioning mark parts corresponding to the two first projection areas 171a in the figure, the center line of the microlens marked in the figure can be determined, that is, the two first positioning mark parts are connected to quickly locate the center line of the microlens.

[0093] In some embodiments, Fig. 9 As shown, the center point 171b of the first projection area 171a is located on the first center line 161c, that is, the first center line 161c passes through the center point 171b of the first projection area 171a, so that the first center line 161c, that is, the center line of the microlens, can be more accurately positioned.

[0094] In some embodiments, Fig.10 As shown, the first projection area 171a is an axisymmetric figure. Taking a rectangle as an example, the first projection area 171a includes a first symmetry axis 171c. The first symmetry axis 171c roughly coincides with the first center line 161c. Similarly, the center line of the microlens can be more accurately positioned.

[0095] It is understandable that in order to show the relationship between the first axis of symmetry 171c and the first center line 161c, the first axis of symmetry 171c in the figure does not completely coincide with the first center line 161c. In other embodiments, the first axis of symmetry 171c and the first center line 161c may completely coincide with each other.

[0096] It is understandable that in Fig.10 In the figure, the first projection area is shown to be a rectangle. In other embodiments, the first projection area may also be a circle, an ellipse, a hexagon, a triangle, or other axisymmetric shapes.

[0097] In some embodiments, the line connecting the center points of the orthographic projections of three adjacent microlenses arranged in the same direction on the substrate is the second center line, the second positioning mark portion and the third positioning mark portion are positioning mark portions whose orthographic projections on the substrate are located between the orthographic projections of the three adjacent microlenses on the substrate, the orthographic projection of the second positioning mark portion on the substrate is the second projection area, and the orthographic projection of the third positioning mark portion on the substrate is the third projection area. Fig.11 As shown, the orthographic projections of three adjacent microlenses arranged along the direction of the arrows shown in the figure on the substrate substrate are respectively orthographic projection 161e, orthographic projection 161g and orthographic projection 161i, the center point of orthographic projection 161e is 161f, the center point of orthographic projection 161g is 161h, and the center point of orthographic projection 161i is 161j. The orthographic projection of the second positioning mark portion on the substrate substrate is the second projection area 171d, and the second projection area 171d is located between the orthographic projection 161e and the orthographic projection 161g. The orthographic projection of the third positioning mark portion on the substrate substrate is the third projection area 171e, and the third projection area 171e is located between the center point of the orthographic projection 161g and 161h. The line connecting the center points of the orthographic projection 161e, the orthographic projection 161g and the orthographic projection 161i is the second center line 161k.

[0098] exist Fig.11 In the illustrated embodiment, a line connecting the center points of the second projection area 171d and the third projection area 171e is a third center line 171f, and the third center line 171f roughly coincides with the second center line 161k. In order to distinguish the third center line 171f from the second center line 161k in the figure, the third center line 171f and the second center line 161k are intentionally drawn to be not completely coincident. In fact, the third center line 171f and the second center line 161k can completely coincide with each other. In this way, the center line of the microlens can be more accurately located by only connecting the centers of the second positioning portion and the third positioning portion.

[0099] exist Fig.12 In the illustrated embodiment, the center point 171f of the second projection area 171d and the center point 171g of the third projection area 171e are respectively located on both sides of the second center line 161k. In this embodiment, the connecting line obtained by connecting the centers of the second positioning portion and the third positioning portion can also accurately locate the center line of the microlens.

[0100] In some embodiments, Fig.13As shown, the second center line 161k passes through the second projection area 171d and the third projection area 171e, the second projection area 171d includes a first edge 171A and a second edge 171B arranged opposite to each other, the third projection area 171e includes a third edge 171C and a fourth edge 171D arranged opposite to each other, the first edge 171A and the third edge 171C are located on the first side of the second center line 161k, the second edge 171B and the fourth edge 171D are located on the second side of the second center line 161k, and along the direction parallel to the substrate and perpendicular to the second center line, the distance d between the second edge 171B and the third edge 171C is 0 to 0.5 microns.

[0101] Specifically, if the distance between the second side 171B and the third side 171C is maintained within a suitable range, the center line of the microlens can be more accurately positioned based on the second positioning portion and the third positioning portion.

[0102] In some possible implementations, the distance d between the second side 171B and the third side 171C may be set to 0.05 micrometers.

[0103] In some possible implementations, such as Fig.14 As shown, the first projection area 171a is located between two adjacent sub-pixel areas, and the orthographic projection 112a of the pixel opening on the substrate substrate does not overlap with the first projection area 171a. Since each pixel opening is configured to define a light-emitting area of ​​a light-emitting device, the first projection area 171a does not overlap with the orthographic projection 112a of the pixel opening on the substrate substrate, and will not affect the light output of the light-emitting device.

[0104] In some possible implementations, such as Fig.15 As shown, the boundary line 112b between the two sub-pixel areas 112a adjacent to the first projection area 171a passes through the center point 171b of the first projection area 171a. It can be understood that on a plane parallel to the substrate, the positioning mark portion is centered between two adjacent microlenses, which makes it easy to locate the midline of the microlens through the positioning mark portion.

[0105] The size of the first projection area also needs to be within a reasonable range. If the size of the first projection area is too large, it may affect the light output of the light emitting device. If the size of the first projection area is too small, it may be difficult to locate the positioning mark portion, resulting in difficulty in locating the center line of the microlens. In some possible implementations, along the extension direction of the first center line 161c, the length of the first projection area is 0.1 to 2 microns.

[0106] Preferably, along the extension direction of the first center line 161c, the length of the first projection area is 0.5 microns.

[0107] In some possible implementations, along a direction perpendicular to the first center line 161 c , a width of the first projection area is 0.05 to 0.5 microns.

[0108] Preferably, along a direction perpendicular to the first center line 161c, a width of the first projection area is 0.2 microns.

[0109] Fig.16 The flowchart of the method for preparing the display panel 10 of some embodiments of the present disclosure is shown, which is applied to prepare the display panel 10 provided in the above embodiments. Fig.16 As shown, the preparation method may at least include the following steps:

[0110] Step S101, forming a light-emitting device layer on one side of a base substrate, wherein the base substrate includes a plurality of sub-pixel areas, and the light-emitting device layer includes a pixel defining layer and a plurality of light-emitting devices, wherein the pixel defining layer is provided with a plurality of pixel openings.

[0111] The pixel opening is configured to define a light emitting area of ​​the light emitting device, and the orthographic projection of the light emitting area of ​​each light emitting device on the substrate is located within one of the sub-pixel areas;

[0112] Step S102 , forming a color filter layer on the light-emitting device layer, wherein the color filter layer includes a plurality of color filter regions.

[0113] Wherein, the orthographic projection of each color filter region on the base substrate covers the orthographic projection of a light emitting region of the light emitting device on the base substrate;

[0114] Step S103 , forming a microlens layer on the color filter layer, wherein the microlens layer includes a plurality of microlenses.

[0115] Wherein, the orthographic projection of the microlens on the base substrate covers the orthographic projection of the light emitting area of ​​at least one of the light emitting devices on the base substrate;

[0116] Step S104: forming a positioning mark layer on a side of the base substrate close to the microlens layer, wherein the positioning mark layer includes a plurality of positioning mark portions.

[0117] Wherein, the orthographic projection of the positioning mark portion on the base substrate is located between the orthographic projections of two adjacent microlenses on the base substrate.

[0118] To prepare Figure 3Taking the display panel 10 of the corresponding embodiment as an example, a substrate 100 may be provided first, and the substrate 100 may be a silicon substrate including a pixel driving circuit (not shown in the figure). The substrate 100 includes a plurality of sub-pixel regions, each of which is provided with a pixel driving circuit of a sub-pixel, the orthographic projection of the light-emitting region of each light-emitting device on the substrate 100 is located in a sub-pixel region, and the orthographic projection of each color filter region on the substrate 100 is located in a sub-pixel region.

[0119] Then, a first electrode 113 (such as an anode), a pixel defining layer 111, a light emitting layer 114, a second electrode 115 (such as a cathode) and an encapsulation layer 120 are sequentially fabricated on the silicon substrate.

[0120] Thereafter, a first protection layer 140 is formed on the encapsulation layer 120 .

[0121] Next, a first color filter unit, a second color filter unit and a third color filter unit are respectively manufactured on the first protection layer 140 through coating, exposure and development processes to form a color filter layer 130 .

[0122] Thereafter, a second protection layer 150 is formed on the color filter layer 130. A plurality of first micro lenses 161 are formed on the second protection layer 150 through a thermal reflow process, that is, a micro lens layer 160 is formed.

[0123] Of course, in addition to the above process flow, the manufacturing process of the display panel 10 also includes other subsequent processes, such as CG attachment, etc., which can be referred to in related technologies and will not be described in detail here.

[0124] It should be noted that Figures 4 to 6 The manufacturing process of the display panel 10 of the corresponding embodiment is similar to Figure 3 The manufacturing process of the display panel 10 of the corresponding embodiment is similar, and the difference lies in the manufacturing of the microlens layer 160 .

[0125] Fig.17 Schematic diagram of the structure of the display device of some embodiments of the present disclosure is shown. Fig.16 As shown, the display device 1000 provided in some embodiments of the present disclosure includes the display panel 10 provided in any of the embodiments above. For example, the display device 1000 can be any product or component with a display function, such as a mobile phone, a laptop computer, a tablet computer, an augmented reality (AR) device, a virtual reality (VR) device, a wearable display device, a display, a television, a car display screen, a digital photo frame, etc. Of course, the display device 1000 provided in the embodiments of the present disclosure is not limited to the types listed above.

[0126] It should be noted that the various embodiments provided in the present disclosure are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0127] In the above description, the technical details such as the composition of each layer of the product are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of desired shapes. In addition, in order to form the same structure, those skilled in the art can also design methods that are not completely the same as the methods described above. Although each embodiment is described separately above, it does not mean that the measures in each embodiment cannot be used in combination to advantage.

Claims

1. A display panel, characterized in that: include: A substrate, comprising a plurality of sub-pixel regions; A light-emitting device layer, arranged on one side of the base substrate, comprising a pixel defining layer and a plurality of light-emitting devices, wherein the pixel defining layer is provided with a plurality of pixel openings, and the pixel openings are configured to define light-emitting areas of the light-emitting devices, and the orthographic projection of the light-emitting area of ​​each light-emitting device on the base substrate is located within one of the sub-pixel areas; A color filter layer, arranged on a side of the light-emitting device layer away from the base substrate, comprising a plurality of color filter regions, wherein the orthographic projection of each color filter region on the base substrate covers the orthographic projection of a light-emitting region of the light-emitting device on the base substrate; A microlens layer, arranged on a side of the color filter layer away from the base substrate, comprising a plurality of microlenses, wherein the orthographic projection of the microlenses on the base substrate covers the orthographic projection of the light emitting area of ​​at least one light emitting device on the base substrate; The positioning mark layer is arranged on the side of the base substrate close to the microlens layer, and includes a plurality of positioning mark parts, the orthographic projections of the positioning mark parts on the base substrate are located between the orthographic projections of two adjacent microlenses on the base substrate.

2. The display panel according to claim 1, characterized in that: The line connecting the center points of the orthographic projections of two adjacent microlenses on the substrate is a first center line, the orthographic projection of the first positioning mark portion on the substrate is a first projection area, the first center line passes through the first projection area, wherein the first positioning mark portion is a positioning mark portion whose orthographic projection on the substrate is located between the orthographic projections of two adjacent microlenses corresponding to the first center line on the substrate.

3. The display panel according to claim 2, characterized in that: The center point of the first projection area is located on the first center line.

4. The display panel according to claim 2, characterized in that: The first projection area is an axisymmetric figure, and the first projection area includes a first symmetry axis, and the first symmetry axis substantially coincides with the first center line.

5. The display panel according to claim 1, characterized in that: The line connecting the center points of the orthographic projections of three adjacent microlenses arranged in the same direction on the base substrate is a second center line, the orthographic projection of the second positioning mark on the base substrate is a second projection area, the orthographic projection of the third positioning mark on the base substrate is a third projection area, and the second positioning mark and the third positioning mark are positioning mark portions whose orthographic projections on the base substrate are located between the orthographic projections of the three adjacent microlenses on the base substrate; The line connecting the center points of the second projection area and the third projection area is the third center line, and the third center line roughly coincides with the second center line; or, the center point of the second projection area and the center point of the third projection area are respectively located on both sides of the second center line.

6. The display panel according to claim 1, characterized in that: The second center line passes through the second projection area and the third projection area, the second projection area includes a first side and a second side arranged opposite to each other, the third projection area includes a third side and a fourth side arranged opposite to each other, the first side and the third side are located on a first side of the second center line, the second side and the fourth side are located on a second side of the second center line, and along a direction parallel to the substrate and perpendicular to the second center line, the distance between the second side and the third side is 0 to 0.5 microns.

7. The display panel according to claim 2, characterized in that: The first projection area is located between two adjacent sub-pixel areas, and the orthographic projection of the pixel opening on the base substrate does not overlap with the first projection area.

8. The display panel according to claim 7, characterized in that: A boundary line between two sub-pixel areas adjacent to the first projection area passes through a center point of the first projection area.

9. The display panel according to claim 2, characterized in that: Along the extension direction of the first center line, the length of the first projection area is 0.1 to 2 microns.

10. The display panel according to claim 2, characterized in that: Along a direction perpendicular to the first center line, a width of the first projection area is 0.05 to 0.5 microns.

11. The display panel according to claim 1, characterized in that: Along a direction perpendicular to the base substrate, the thickness of the positioning mark portion is 0.05 to 1 micrometer.

12. The display panel according to claim 1, characterized in that: The light emitting device comprises a first electrode layer, a light emitting layer and a second electrode layer which are sequentially stacked on the base substrate, and the display panel further comprises: An encapsulation layer is arranged on a side of the second electrode layer away from the base substrate; A first protective layer, disposed between the encapsulation layer and the color filter layer; A second protective layer, disposed between the color filter layer and the microlens layer; Wherein, the positioning mark layer is arranged on a side of the second protective layer close to the microlens layer, a gap exists between two adjacent microlenses, and the positioning mark portion is located at the gap; or, The positioning mark layer is arranged between the color filter layer and the second protective layer; or, The positioning mark layer is disposed between the encapsulation layer and the first protective layer; or, The positioning mark layer is disposed between the second electrode layer and the encapsulation layer.

13. A method for preparing a display panel, characterized in that: include: A light-emitting device layer is formed on one side of a base substrate, wherein the base substrate includes a plurality of sub-pixel regions, the light-emitting device layer includes a pixel defining layer and a plurality of light-emitting devices, the pixel defining layer is provided with a plurality of pixel openings, the pixel openings are configured to define light-emitting regions of the light-emitting devices, and the orthographic projection of the light-emitting region of each light-emitting device on the base substrate is located within one of the sub-pixel regions; Forming a color filter layer on the light-emitting device layer, wherein the color filter layer includes a plurality of color filter regions, and the orthographic projection of each color filter region on the base substrate covers the orthographic projection of a light-emitting region of the light-emitting device on the base substrate; Forming a microlens layer on the color filter layer, wherein the microlens layer includes a plurality of microlenses, and the orthographic projection of the microlenses on the base substrate covers the orthographic projection of the light emitting area of ​​at least one light emitting device on the base substrate; A positioning mark layer is formed on one side of the base substrate close to the microlens layer. The positioning mark layer includes a plurality of positioning mark portions. The orthographic projections of the positioning mark portions on the base substrate are located between the orthographic projections of two adjacent microlenses on the base substrate.

14. A display device, characterized in that: A display panel comprising any one of claims 1-12.

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