Display panel and preparation method therefor, and display device

Abstract

A display panel and a preparation method therefor, and a display device. The display panel comprises a driving substrate, a pixel defining layer located on one side of the driving substrate, and a light-emitting element. The light-emitting element comprises a first electrode, a light-emitting functional layer and a second electrode, wherein the first electrode, the light-emitting functional layer and the second electrode are sequentially stacked in a direction away from the driving substrate; a first opening is formed in the pixel defining layer, and the light-emitting element is located in the first opening; a second opening is further formed in the pixel defining layer, the orthographic projection of the second opening on the driving substrate surrounds the periphery of the orthographic projection of the first opening on the driving substrate, and the second electrode further extends into the second opening; and the driving substrate comprises a base and a reflecting structure, the reflecting structure is located on the side of the base close to the pixel defining layer, the orthographic projection of the reflecting structure on the base surrounds the periphery of the orthographic projection of the first opening on the base, and the orthographic projections of the reflecting structure and the second opening on the base are at least partially overlap, and the reflecting structure can reflect light emitted by the light-emitting element into an area surrounded by the reflecting structure.

Description

Display panel, manufacturing method thereof, and display device Technical Field

[0001] The embodiments of the present disclosure belong to the field of display technology, and particularly relate to a display panel, a manufacturing method thereof, and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode) displays have attracted widespread attention due to their advantages such as self-luminescence, low power consumption, lightness, flexibility, brilliant colors, high contrast, and fast response rate.

[0003] Summary of the Invention

[0004] In a first aspect, an embodiment of the present disclosure provides a display panel, comprising a driving substrate, a pixel defining layer, and a light-emitting element, wherein the pixel defining layer is located on one side of the driving substrate.

[0005] The light emitting element comprises a first electrode, a light emitting functional layer and a second electrode, wherein the first electrode, the light emitting functional layer and the second electrode are stacked in sequence away from the driving substrate;

[0006] A first opening is formed in the pixel defining layer, and the light emitting element is located in the first opening;

[0007] A second opening is further formed in the pixel defining layer, wherein the orthographic projection of the second opening on the driving substrate surrounds the orthographic projection of the first opening on the driving substrate, and the second electrode further extends into the second opening;

[0008] The driving substrate includes a base and a reflective structure, wherein the reflective structure is located on a side of the base close to the pixel defining layer, an orthographic projection of the reflective structure on the base surrounds an orthographic projection of the first opening on the base, and the orthographic projections of the reflective structure and the second opening on the base at least partially overlap;

[0009] The reflective structure can reflect the light emitted by the light emitting element toward the area surrounded by it.

[0010] In some embodiments, the driving substrate further includes a first flat layer located between the base and the reflective structure.

[0011] A convex structure is formed on a surface of the first flat layer on one side close to the reflective structure, wherein an orthographic projection of the convex structure on the substrate surrounds the periphery of the first opening, and an orthographic projection of the convex structure and the second opening on the substrate at least partially overlap;

[0012] The orthographic projection of the reflective structure on the substrate at least covers a portion of the orthographic projection of the protruding structure on the substrate that is close to the orthographic projection of the first opening on the substrate.

[0013] In some embodiments, the driving substrate further includes a first flat layer located between the base and the reflective structure.

[0014] A groove structure is formed on a surface of the first flat layer on one side close to the reflective structure, wherein an orthographic projection of the groove structure on the substrate surrounds the periphery of the first opening, and an orthographic projection of the groove structure and the second opening on the substrate at least partially overlap;

[0015] The orthographic projection of the reflective structure on the substrate at least covers a portion of the orthographic projection of the groove structure on the substrate that is close to the orthographic projection of the first opening on the substrate.

[0016] In some embodiments, the driving substrate further includes a pixel circuit located on a side of the substrate close to the pixel defining layer.

[0017] The pixel circuit includes a driving transistor located on a side of the first planar layer away from the substrate, the driving transistor including an active layer, a gate insulating layer, a source electrode, a drain electrode, and a gate electrode, wherein the source electrode and the drain electrode are arranged in the same layer, and the active layer, the gate insulating layer, the source electrode, the drain electrode, and the gate electrode are stacked in this order away from the substrate;

[0018] The reflective structure is formed in the same layer and material as the source electrode and the drain electrode, or the reflective structure is formed in the same layer and material as the gate electrode;

[0019] The reflective structure and the second electrode are both made of opaque metal material.

[0020] In some embodiments, the driving substrate further includes a first insulating layer located between the pixel circuit and the pixel defining layer.

[0021] The drain electrode and the gate electrode do not overlap with the orthographic projection of the first opening on the substrate;

[0022] The active layer extends to the orthographic projection area of ​​the first opening on the substrate, and the orthographic projection of the source electrode on the substrate is at least partially located in the orthographic projection area of ​​the first opening on the substrate.

[0023] The first electrode is electrically connected to the source electrode through a via hole provided in the first insulating layer;

[0024] The reflective structure is located between the active layer and the first insulating layer, and orthographic projections of the reflective structure and the active layer on the substrate partially overlap.

[0025] In some embodiments, the orthographic projections of the light-emitting functional layer and the via hole on the substrate do not overlap;

[0026] The pixel defining layer is also located in the via hole and between the first electrode and the second electrode.

[0027] In some embodiments, a second planarization layer is further included, located between the first insulating layer and the pixel defining layer.

[0028] The via hole penetrates the second planar layer;

[0029] A third opening is formed in the second flat layer, wherein the orthographic projection of the third opening on the substrate surrounds the periphery of the first opening, and the orthographic projections of the third opening and the second opening on the substrate at least partially overlap;

[0030] The second electrode also extends into the third opening.

[0031] In some embodiments, a color resist layer is further included, located between the first insulating layer and the second planar layer.

[0032] The via hole also penetrates the color resist layer;

[0033] A fourth opening is formed in the color resist layer, wherein the orthographic projection of the fourth opening on the substrate surrounds the periphery of the first opening, and the orthographic projections of the fourth opening on the substrate at least partially overlap with those of the third opening and the second opening;

[0034] The second electrode also extends into the fourth opening.

[0035] In some embodiments, the cross-sectional shape of the protrusion structure perpendicular to the base includes a trapezoid or a semicircle.

[0036] The height of the trapezoid ranges from 0.5 to 5 μm;

[0037] The length of the longer base of the trapezoid ranges from 1 to 20 μm;

[0038] The base angle of the trapezoid ranges from 30° to 90°.

[0039] In some embodiments, the cross-sectional shape of the groove structure perpendicular to the substrate includes an inverted trapezoid or a semicircle.

[0040] The depth of the inverted trapezoid ranges from 0.5 to 5 μm;

[0041] The length of the longer base of the inverted trapezoid ranges from 1 to 20 μm;

[0042] The base angle of the inverted trapezoid ranges from 30° to 90°.

[0043] In some embodiments, the second electrode extending into the second opening, the third opening, and the fourth opening forms a slope angle of 30° to 90°.

[0044] In some embodiments, the first planar layer is made of a silicon-based organic-inorganic hybrid resin material;

[0045] The temperature tolerance range of the silicon series organic-inorganic hybrid resin material is 300° C. to 500° C.

[0046] In some embodiments, the orthographic projections of the reflective structure and the first opening on the substrate do not overlap;

[0047] There are multiple light-emitting elements, and the multiple light-emitting elements are arranged in an array;

[0048] The pixel circuit further includes a plurality of light-proof conductive patterns, wherein the plurality of light-proof conductive patterns do not overlap with the orthographic projection of the first opening on the substrate;

[0049] The opaque conductive pattern includes data lines, scan lines, power lines and touch signal lines.

[0050] Orthographic projections of at least part of the data lines, the scan lines, the power lines, and the touch signal lines on the substrate are located between orthographic projections of the light-emitting elements in adjacent columns on the substrate;

[0051] Orthographic projections of at least part of the data lines, the scan lines, the power lines, and the touch signal lines on the substrate are located between orthographic projections of the light emitting elements in adjacent rows on the substrate.

[0052] In some embodiments, the invention further comprises a plurality of micro lenses located between the substrate and the first flat layer, wherein the plurality of micro lenses are arranged in an array.

[0053] The array of micro lenses at least overlaps with an orthographic projection of the first opening on the substrate.

[0054] In some embodiments, the microlens includes a plurality of micro-recessed structures formed on a surface of the substrate adjacent to the pixel defining layer.

[0055] The microlens further includes a plurality of micro-protrusion structures formed on a surface of the first flat layer close to the substrate.

[0056] The plurality of micro-concave structures correspond to the plurality of micro-convex structures one by one, and are adapted in size and shape.

[0057] In a second aspect, an embodiment of the present disclosure further provides a display device, which includes the above-mentioned display panel.

[0058] In a third aspect, an embodiment of the present disclosure further provides a method for manufacturing a display panel, which includes preparing a driving substrate, and preparing a pixel defining layer and a light-emitting element on one side of the driving substrate;

[0059] The preparation of the light-emitting element includes sequentially preparing a first electrode, a light-emitting functional layer, and a second electrode;

[0060] Preparing the pixel defining layer includes forming a first opening and a second opening in the pixel defining layer;

[0061] The light emitting element is located in the first opening; the orthographic projection of the second opening on the driving substrate surrounds the periphery of the orthographic projection of the first opening on the driving substrate, and the second electrode further extends into the second opening;

[0062] Preparing the driving substrate includes preparing a reflective structure on a side of the substrate close to the pixel defining layer;

[0063] The orthographic projection of the reflective structure on the substrate surrounds the periphery of the orthographic projection of the first opening on the substrate, and the orthographic projections of the reflective structure and the second opening on the substrate at least partially overlap.

[0064] In some embodiments, preparing the driving substrate further includes preparing a first flat layer between the base and the reflective structure.

[0065] The preparation of the first flat layer includes: coating a silicon series organic-inorganic hybrid resin material on the substrate;

[0066] forming a pattern of the first planar layer, a pattern of a protruding structure, or a pattern of a recessed structure through an exposure and development process or a dry etching process;

[0067] The orthographic projection of the protrusion structure or the groove structure on the substrate surrounds the periphery of the first opening, and the orthographic projection of the protrusion structure or the groove structure and the second opening on the substrate at least partially overlap;

[0068] The orthographic projection of the reflective structure on the substrate at least covers a portion of the orthographic projection of the protrusion structure or the groove structure on the substrate that is close to the orthographic projection of the first opening on the substrate.

[0069] In some embodiments, preparing the driving substrate further comprises preparing a pixel circuit on a side of the substrate close to the pixel defining layer;

[0070] Preparing the pixel circuit includes preparing a driving transistor on a side of the first planar layer facing away from the substrate;

[0071] The preparation of the driving transistor includes sequentially preparing an active layer, a gate insulating layer, a source electrode and a drain electrode of the same layer and material, and a gate electrode;

[0072] The reflective structure, the source electrode, and the drain electrode are made of the same material and are manufactured through a single patterning process; or, the reflective structure and the gate electrode are made of the same material and are manufactured through a single patterning process.

[0073] Beneficial effects of the present disclosure: The display panel provided by the embodiment of the present disclosure forms a reflective electrode surrounding the light-emitting element by opening a second opening in the pixel defining layer and extending the second electrode into the second opening. The reflective electrode surrounding the light-emitting element can increase the reflective area of ​​the second electrode, so that the light emitted by the light-emitting element is reflected within its surrounding range, thereby improving the luminous efficiency of the light-emitting element, and further improving the luminous efficiency of the bottom-emitting display panel; however, the second electrode extending into the second opening easily causes light of different colors emitted by adjacent light-emitting elements to mix, so that the viewing angle of the light-emitting element is reduced. In this embodiment, a reflective structure is provided in the driving substrate, and the positive projection of the reflective structure on the substrate surrounds the periphery of the positive projection of the first opening on the substrate. On the one hand, due to the reflective structure The reflective structure can reflect the light emitted by the light-emitting element into the area surrounding it, which is equivalent to forming a reflective structure surrounding the light-emitting element in the driving substrate. The reflective structure can further increase the reflective area of ​​the second electrode, so that the light emitted by the light-emitting element is further reflected within the surrounding range, thereby improving the luminous efficiency of the light-emitting element and further improving the luminous efficiency of the bottom-emitting display panel. On the other hand, the reflective structure provided in the driving substrate can reflect most of the light emitted by the light-emitting element at a larger angle into the area surrounding it, thereby improving or avoiding the mixing of light emitted by adjacent light-emitting elements, and then improving or avoiding the mixing of light of different colors emitted by adjacent light-emitting elements, thereby adjusting the viewing angle of the light-emitting element and the degree of improvement in the luminous efficiency due to the second electrode surrounding the light-emitting element.

[0074] The display device provided by the embodiment of the present disclosure adopts the above-mentioned display panel, which not only improves the luminous efficiency of the display device, but also improves or avoids the poor color mixing of the display device and increases the viewing angle of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. The above and other features and advantages will become more apparent to those skilled in the art by describing the detailed exemplary embodiments with reference to the accompanying drawings, in which:

[0076] FIG. 1 is a schematic diagram showing the luminous efficiency of an OLED light-emitting element in a conventional bottom-emitting OLED display device without a light-efficiency enhancement structure.

[0077] FIG. 2 a is a partial cross-sectional schematic diagram of a bottom-emission OLED display device in the related art.

[0078] FIG. 2 b is a partial cross-sectional schematic diagram of another bottom-emission OLED display device in the related art.

[0079] FIG. 2 c is a partial cross-sectional schematic diagram of another bottom-emission OLED display device in the related art.

[0080] FIG. 2 d is a partial cross-sectional schematic diagram of another bottom-emission OLED display device in the related art.

[0081] FIG3 a is a schematic top view of a partial structure of a display panel according to an embodiment of the present disclosure.

[0082] FIG3 b is a schematic cross-sectional view of the structure of the display panel along the AA′ section line in FIG3 a according to an embodiment of the present disclosure.

[0083] FIG3 c is a schematic cross-sectional view of the structure of the display panel along the BB′ section line in FIG3 a according to an embodiment of the present disclosure.

[0084] FIG3 d is another schematic cross-sectional view of the structure of the display panel along the BB′ section line in FIG3 a according to an embodiment of the present disclosure.

[0085] FIG. 4 a is a schematic cross-sectional view of another structure of the display panel along the BB′ section line in FIG. 3 a according to an embodiment of the present disclosure.

[0086] FIG. 4 b is another schematic cross-sectional view of the display panel along the BB′ section line in FIG. 3 a according to an embodiment of the present disclosure.

[0087] FIG5 is a flow chart of a method for preparing a display panel according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0088] To enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, a display panel, a manufacturing method thereof, and a display device provided by the embodiments of the present disclosure are further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0089] The embodiments of the present disclosure will be described more fully below with reference to the accompanying drawings, but the illustrated embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully enable those skilled in the art to understand the scope of this disclosure.

[0090] The embodiments of the present disclosure are not limited to the embodiments shown in the drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the drawings are schematic in nature, and the shapes of the regions shown in the drawings illustrate specific shapes of the regions, but are not intended to be limiting.

[0091] In the related art, referring to FIG1 , there is a schematic diagram of the luminous efficiency of an OLED light-emitting element in a conventional bottom-emitting OLED display device without a light-efficiency enhancement structure. As can be seen from FIG1 , in a bottom-emitting OLED display device, the cathode layer Cathode acts as a reflective electrode to reflect the light emitted by the OLED light-emitting element, and the reflected light is emitted from the cover glass side (i.e., the screen display side) through the transparent anode layer Anode. Of the light emitted by the light-emitting functional layer (such as the hole transport layer HTL, the light-emitting material layer EML, and the electron transport layer ETL) of the OLED light-emitting element without a light-efficiency enhancement structure, about 20% is emitted from the cover glass side; about 50% is lost due to the light conduction mode of the transparent anode layer Anode (using indium tin oxide layer material, i.e., ITO) or the organic material layer (such as the hole transport layer HTL); and about 30% is lost due to the light conduction mode of the cover glass. As can be seen, in a bottom-emitting OLED display device without a light-efficiency-enhancing structure, approximately 80% of the light emitted by the OLED light-emitting element cannot escape from the cover glass side (i.e., the display side) and is lost. Therefore, conventional bottom-emitting OLED displays without a light-efficiency-enhancing structure have low luminous efficiency.

[0092] In the related art, in order to improve the luminous efficiency of a bottom-emission OLED display device, various light efficiency enhancement methods have been proposed.

[0093] 2a , 2b , 2c , and 2d , FIG. 2a is a partial cross-sectional schematic diagram of a bottom-emitting OLED display device in the related art; FIG. 2b is a partial cross-sectional schematic diagram of another bottom-emitting OLED display device in the related art; FIG. 2c is a partial cross-sectional schematic diagram of yet another bottom-emitting OLED display device in the related art; and FIG. 2d is a partial cross-sectional schematic diagram of yet another bottom-emitting OLED display device in the related art. The cathode layer 5 of the OLED light-emitting element in the bottom-emitting OLED display device is extended to surround the periphery of the opening in the pixel defining layer 2 for accommodating the OLED light-emitting element. Since the cathode layer 5 can reflect light emitted by the OLED light-emitting element, the high reflectivity of the cathode layer 5 surrounding the periphery of the opening in the pixel defining layer 2 for accommodating the OLED light-emitting element is utilized to reflect the light emitted by the OLED light-emitting element within a 360-degree range around the OLED light-emitting element, thereby forming a mirror shape surrounding the OLED light-emitting element, thereby improving the luminous efficiency of the OLED light-emitting element, thereby improving the luminous efficiency of the bottom-emitting OLED display device.

[0094] However, the cathode layer reflective structure surrounding the opening for accommodating the OLED light-emitting element in the pixel defining layer 2 in Figures 2a to 2d has different degrees of surrounding of the OLED light-emitting element by the cathode layer reflective structure. When adjacent OLED light-emitting elements emit light through the color resist layers 16 of different colors located on their light-emitting sides, color mixing is likely to occur. For example, when the color coordinates deviate by approximately ±0.02, light of different colors emitted by adjacent OLED light-emitting elements will mix, resulting in a reduction in the viewing angle of the OLED light-emitting element.

[0095] As shown in FIG2a to FIG2d , as the degree of surrounding of the OLED light-emitting element by the cathode layer reflective structure gradually increases, the viewing angle of the OLED light-emitting element in FIG2a to FIG2d will gradually increase.

[0096] In order to solve the problem of improving the luminous efficiency of the bottom-emitting OLED display device while avoiding the occurrence of color mixing in the OLED display device in the related art, on the first hand, an embodiment of the present disclosure provides a display panel, referring to Figures 3a, 3b and 3c, Figure 3a is a schematic top view of the local structure of a display panel in the embodiment of the present disclosure; Figure 3b is a schematic cross-sectional view of the structure of the display panel along the AA' section line in Figure 3a in the embodiment of the present disclosure; Figure 3c is a schematic cross-sectional view of the structure of the display panel along the BB' section line in Figure 3a in the embodiment of the present disclosure; wherein, the display panel includes a driving substrate 1, a pixel defining layer 2 and a light-emitting element 3, the pixel defining layer 2 is located on one side of the driving substrate 1, the light-emitting element 3 includes a first electrode 31, a light-emitting functional layer 32 and a second electrode 33, the first electrode 31, the light-emitting functional layer 32 and the second electrode The electrodes 33 are stacked in sequence away from the driving substrate 1; a first opening 201 is opened in the pixel defining layer 2, and the light-emitting element 3 is located in the first opening 201; a second opening 202 is also opened in the pixel defining layer 2, and the orthographic projection of the second opening 202 on the driving substrate 1 surrounds the orthographic projection of the first opening 201 on the driving substrate 1, and the second electrode 33 also extends into the second opening 202; the driving substrate 1 includes a base 10 and a reflective structure 11, the reflective structure 11 is located on a side of the base 10 close to the pixel defining layer 2, the orthographic projection of the reflective structure 11 on the base 10 surrounds the orthographic projection of the first opening 201 on the base 10, and the orthographic projections of the reflective structure 11 and the second opening 202 on the base 10 at least partially overlap; the reflective structure 11 can reflect the light emitted by the light-emitting element 3 into the area surrounded by it.

[0097] The light-emitting element 3 is an organic electroluminescent element, i.e., an OLED light-emitting element. The second electrode 33 extends into the second opening 202 and covers at least one sidewall of the second opening 202 adjacent to the first opening 201. The second electrode 33 is capable of reflecting light emitted by the light-emitting element 3, indicating that the display panel is a bottom-emission OLED display panel.

[0098] In this embodiment, a second opening 202 is opened in the pixel defining layer 2, and the second electrode 33 extends into the second opening 202, thereby forming a reflective electrode surrounding the light-emitting element 3 around the light-emitting element 3. The reflective electrode surrounding the light-emitting element 3 can increase the reflection area of ​​the second electrode 33, so that the light emitted by the light-emitting element 3 is reflected within a 360-degree range around it, thereby improving the luminous efficiency of the light-emitting element 3, and further improving the luminous efficiency of the bottom-emitting display panel; however, the second electrode 33 extending into the second opening 202 easily causes light of different colors emitted by adjacent light-emitting elements 3 to mix colors, so that the viewing angle of the light-emitting element 3 is reduced. In this embodiment, a reflective structure 11 is provided in the driving substrate 1, and the orthographic projection of the reflective structure 11 on the substrate 10 surrounds the periphery of the orthographic projection of the first opening 201 on the substrate 10. On the one hand, since the reflective structure 11 can Reflecting the light emitted by the light-emitting element 3 into the area it surrounds is equivalent to forming a reflective structure 11 surrounding the light-emitting element 3 in the driving substrate 1. The reflective structure 11 can further increase the reflective area of ​​the second electrode 33, so that the light emitted by the light-emitting element 3 is further reflected within a 360-degree range around it, thereby improving the luminous efficiency of the light-emitting element 3 and further improving the luminous efficiency of the bottom-emitting display panel. On the other hand, the reflective structure 11 provided in the driving substrate 1 can reflect most of the light emitted by the light-emitting element 3 at a larger angle into the area it surrounds, thereby improving or avoiding the mixing of light emitted by adjacent light-emitting elements 3, and then improving or avoiding the mixing of light of different colors emitted by adjacent light-emitting elements 3, thereby adjusting the viewing angle of the light-emitting element 3 and the degree to which the luminous efficiency can be improved by the second electrode 33 surrounding the light-emitting element 3.

[0099] In some embodiments, referring to Figures 3b and 3c, the driving substrate 1 further includes a first flat layer 12, which is located between the base 10 and the reflective structure 11. A protruding structure 121 is formed on a surface of the first flat layer 12 on one side close to the reflective structure 11. The orthographic projection of the protruding structure 121 on the base 10 surrounds the periphery of the first opening 201, and the orthographic projections of the protruding structure 121 and the second opening 202 on the base 10 at least partially overlap; the orthographic projection of the reflective structure 11 on the base 10 at least covers the portion of the orthographic projection of the protruding structure 121 on the base 10 close to the orthographic projection of the first opening 201 on the base 10.

[0100] Among them, the raised structure 121 can form a ring around the first opening 201, so that the reflective structure 11 can form a ring around the first opening 201, and the inner ring surface of the reflective structure 11 faces the area where the first opening 201 is located, so that the reflective structure 11 can reflect the light emitted by the light-emitting element 3 into the area surrounded by it; at the same time, the setting of the reflective structure 11 can make the light emitted by the light-emitting element 3 at a larger angle be reflected back by the reflective structure 11 into the light-emitting area of ​​the light-emitting element 3, thereby improving the light-emitting efficiency of the light-emitting element 3; at the same time, it can prevent the light emitted by the light-emitting element 3 at a larger angle from reaching the light-emitting area of ​​the adjacent light-emitting element 3, thereby avoiding the mixing of light and color of the light emitted by the adjacent light-emitting elements 3, and then adjusting or improving the light-emitting viewing angle of the light-emitting element 3, and preventing the viewing angle of the light-emitting element 3 from being reduced uncontrollably.

[0101] In some embodiments, the cross-sectional shape of the raised structure 121 perpendicular to the substrate 10 includes a trapezoid or a semicircular shape, with the height of the trapezoid ranging from 0.5 to 5 μm; the length of the longer base of the trapezoid ranging from 1 to 20 μm; and the base angle of the trapezoid ranging from 30° to 90°. This angle range facilitates the reflective structure 11 formed on the side of the raised structure 121 near the first opening 201 to reflect the light incident thereon toward the light-emitting region of the light-emitting element 3, thereby better improving or preventing light mixing and color mixing between adjacent light-emitting elements 3.

[0102] In some embodiments, the first planar layer 12 and the protruding structure 121 are made of the same material and are formed into an integral structure.

[0103] In some embodiments, the first planar layer 12 is made of a silicon-based organic-inorganic hybrid resin material having a temperature tolerance range of 300° C. to 500° C., such as a mixture of an organic resin material and a silicon oxide material, or a mixture of an organic resin material and a silicon nitride material.

[0104] In some embodiments, referring to Figures 3b and 3c, the driving substrate 1 further includes a pixel circuit 13, which is located on a side of the substrate 10 close to the pixel defining layer 2. The pixel circuit 13 includes a driving transistor 130, which is located on a side of the first flat layer 12 away from the substrate 10. The driving transistor 130 includes an active layer 1301, a gate insulating layer 1302, a source 1303, a drain 1304 and a gate 1305. The source 1303 and the drain 1304 are arranged in the same layer, and the active layer 1301, the gate insulating layer 1302, the source 1303, the drain 1304, and the gate 1305 are stacked in sequence away from the substrate 10; the reflective structure 11 is in the same layer and material as the source 1303 and the drain 1304, or the reflective structure 11 is in the same layer and material as the gate 1305; the reflective structure 11 and the second electrode 33 are both made of opaque metal material.

[0105] The reflective structure 11 is formed from the same layer and material as the source electrode 1303 and the drain electrode 1304, or the same layer and material as the gate electrode 1305. This allows the reflective structure 11 to be fabricated without adding additional steps to the display panel fabrication process, and the reflective structure 11 and the source electrode 1303 and the drain electrode 1304 or the gate electrode 1305 can be fabricated through a single patterning process. Highly reflective metal materials such as aluminum (Al), silver (Ag), copper (Cu), gold (Au), or alloys of these metals can be used to increase the reflectivity of the reflective structure 11 to light incident thereon.

[0106] In some embodiments, referring to Figures 3b and 3c, the driving substrate 1 also includes a first insulating layer 14, which is located between the pixel circuit 13 and the pixel defining layer 2, and the drain 1304 and the gate 1305 do not overlap with the orthographic projection of the first opening 201 on the substrate 10; the active layer 1301 extends to the orthographic projection area of ​​the first opening 201 on the substrate 10, and the orthographic projection of the source 1303 on the substrate 10 is at least partially located within the orthographic projection area of ​​the first opening 201 on the substrate 10, and the first electrode 31 is electrically connected to the source 1303 through a via hole opened in the first insulating layer 14; the reflective structure 11 is located between the active layer 1301 and the first insulating layer 14, and the orthographic projections of the reflective structure 11 and the active layer 1301 on the substrate 10 partially overlap.

[0107] The portion of the reflective structure 11 located in the area where the pixel circuit 13 is located overlaps with the active layer 1301 of the driving transistor 130 .

[0108] In some embodiments, the orthographic projections of the light-emitting functional layer 32 and the via hole on the substrate 10 do not overlap; the pixel defining layer 2 is also located in the via hole and between the first electrode 31 and the second electrode 33. That is, the light-emitting functional layer 32 is not provided at the location of the via hole in the first insulating layer 14, so the location of the via hole in the first insulating layer 14 does not emit light.

[0109] In this embodiment, the source electrode 1303 is made of an opaque metal material. The source electrode 1303 can block the via hole, thereby preventing the light emitted by the adjacent light-emitting element 3 from mixing and mixing at the via hole, thereby avoiding the color gamut degradation of the light-emitting element 3 caused by mixing and mixing. In addition, a pixel defining layer 2 is provided in the via hole, and the pixel defining layer 2 contacts the first electrode 31 and the second electrode 33 at the via hole location, thereby preventing a short circuit between the first electrode 31 and the second electrode 33.

[0110] In some embodiments, referring to Figures 3b and 3c, the display panel also includes a second flat layer 15, which is located between the first insulating layer 14 and the pixel defining layer 2, and the via hole passes through the second flat layer 15; a third opening 150 is opened in the second flat layer 15, and the orthographic projection of the third opening 150 on the substrate 10 surrounds the periphery of the first opening 201, and the orthographic projections of the third opening 150 and the second opening 202 on the substrate 10 at least partially overlap; the second electrode 33 also extends into the third opening 150.

[0111] The second electrode 33 extends into the third opening 150 and covers at least one sidewall of the third opening 150 adjacent to the first opening 201. This increases the degree of surrounding coverage of the light-emitting element 3 within the first opening 201 by the second electrode 33, thereby further increasing the reflection area of ​​the second electrode 33. This allows light emitted by the light-emitting element 3 to be reflected over a larger area within a 360-degree range around it, further improving the luminous efficiency of the light-emitting element 3 and the luminous efficiency of the bottom-emission display panel. However, the second electrode 33 extending into the third opening 150 still easily causes light of different colors emitted by adjacent light-emitting elements 3 to mix, thereby reducing the viewing angle of the light-emitting elements 3. However, compared to a solution in which the second electrode 33 extends only into the second opening 202, in this embodiment, the second electrode 33 extends further into the third opening 150 in addition to extending into the second opening 202. This reduces the degree of color mixing of light of different colors emitted by adjacent light-emitting elements 3, thereby increasing the viewing angle of the light-emitting elements 3.

[0112] In some embodiments, referring to Figures 3b and 3c, the display panel further includes a color resist layer 16, which is located between the first insulating layer 14 and the second planar layer 15, and the via hole also penetrates the color resist layer 16; a fourth opening 160 is opened in the color resist layer 16, and the orthographic projection of the fourth opening 160 on the substrate 10 surrounds the periphery of the first opening 201, and the fourth opening 160 at least partially overlaps with the orthographic projections of the third opening 150 and the second opening 202 on the substrate 10; the second electrode 33 also extends into the fourth opening 160.

[0113] The second electrode 33 extends into the fourth opening 160 and covers at least a sidewall of the fourth opening 160 adjacent to the first opening 201. Thus, the second electrode 33 further increases the degree of surrounding coverage of the light-emitting element 3 located in the first opening 201, thereby further increasing the reflection area of ​​the second electrode 33. This allows light emitted by the light-emitting element 3 to be reflected over a larger area within a 360-degree range around it, further improving the luminous efficiency of the light-emitting element 3 and the luminous efficiency of the bottom-emission display panel. However, the second electrode 33 extending into the fourth opening 160 still easily causes light of different colors emitted by adjacent light-emitting elements 3 to mix, thereby reducing the viewing angle of the light-emitting elements 3. However, compared to the embodiment in which the second electrode 33 extends only into the second opening 202 and the third opening 150, in this embodiment, the second electrode 33 extends into the fourth opening 160 in addition to extending into the second opening 202 and the third opening 150. This further reduces the degree of color mixing of light of different colors emitted by adjacent light-emitting elements 3, thereby further increasing the viewing angle of the light-emitting elements 3.

[0114] In some embodiments, the second electrode 33 extending into the second opening 202, the third opening 150, and the fourth opening 160 forms a slope angle of 30° to 90°. This slope angle range facilitates the second electrode 33 to reflect the light incident thereon into the light-emitting region of the light-emitting element 3, thereby better improving or preventing light from mixing and color mixing between adjacent light-emitting elements 3.

[0115] In some embodiments, the center of the second electrode 33 extending to the second opening 202, the third opening 150 and the fourth opening 160 coincides with the center of the first opening 201, and the radius and slope angle of the second electrode 33 extending to the second opening 202, the third opening 150 and the fourth opening 160 can be adjusted so that the second electrode 33 can better realize the function of improving the luminous efficiency of the light-emitting element 3 and appropriately reducing the degree of mixing of different colors of light emitted by adjacent light-emitting elements 3, thereby appropriately increasing the viewing angle of the light-emitting element 3.

[0116] In some embodiments, the orthographic projections of the reflective structure 11 and the first opening 201 on the substrate 10 do not overlap; there are multiple light-emitting elements 3, and the multiple light-emitting elements 3 are arranged in an array; the pixel circuit 13 also includes multiple opaque conductive patterns 131, and the multiple opaque conductive patterns 131 do not overlap with the orthographic projections of the first opening 201 on the substrate 10; the opaque conductive patterns 131 include data lines, scan lines, power lines and touch signal lines, and the orthographic projections of at least part of the data lines, scan lines, power lines and touch signal lines on the substrate 10 are located between the orthographic projections of adjacent columns of light-emitting elements 3 on the substrate 10; the orthographic projections of at least part of the data lines, scan lines, power lines and touch signal lines on the substrate 10 are located between the orthographic projections of adjacent rows of light-emitting elements 3 on the substrate 10.

[0117] The reflective structure 11 does not block the light emitted by the light-emitting element 3 within the first opening 201. The opaque conductive pattern 131 also does not block the light emitted by the light-emitting element 3 within the first opening 201. For example, the orthographic projections of the data lines, power lines, and at least a portion of the touch signal lines on the substrate 10 are located between the orthographic projections of the light-emitting elements 3 in adjacent columns on the substrate 10; and the orthographic projections of the scan lines and at least a portion of the touch signal lines on the substrate 10 are located between the orthographic projections of the light-emitting elements 3 in adjacent rows on the substrate 10.

[0118] In some embodiments, the opaque conductive pattern 131 is located between the first planar layer 12 and the substrate 10 .

[0119] In some embodiments, the opaque conductive pattern 131 also includes a light-shielding layer, which is located at least on the side of the driving transistor 130 close to the substrate 10, and the positive projection of the light-shielding layer on the substrate 10 covers at least the overlapping area of ​​the gate 1305 and the active layer 1301. The light-shielding layer can block the channel area of ​​the active layer 1301 to prevent light from increasing the leakage current of the driving transistor 130.

[0120] In this embodiment, the provision of multiple opaque conductive patterns 131 is equivalent to, on the one hand, providing other reflective structures around the corresponding area of ​​the light-emitting element 3 in the driving substrate 1 that can reflect the light emitted by the light-emitting element 3. These reflective structures can further increase the reflective area of ​​the second electrode 33, so that the light emitted by the light-emitting element 3 is further reflected within a 360-degree range around it, thereby improving the luminous efficiency of the light-emitting element 3 and further improving the luminous efficiency of the bottom-emitting display panel; on the other hand, the multiple opaque conductive patterns 131 provided in the driving substrate 1 can reflect the larger angle of light irradiated by the light-emitting element 3 to the area corresponding to the light-emitting element 3, thereby further improving or avoiding the mixing of light emitted by adjacent light-emitting elements 3, and further improving or avoiding the mixing of different colors of light emitted by adjacent light-emitting elements 3, thereby further adjusting the viewing angle of the light-emitting element 3, and at the same time, further adjusting the degree of luminous efficiency that can be improved by the second electrode 33 surrounding the light-emitting element 3.

[0121] In some embodiments, referring to Figures 3a and 3d, Figure 3d is a schematic cross-sectional view of another structure of a display panel along the BB' section line in Figure 3a in an embodiment of the present disclosure. The display panel further includes a plurality of microlenses 4 located between substrate 10 and first planar layer 12. The plurality of microlenses 4 are arranged in an array, and the array of microlenses 4 at least overlaps with the orthographic projection of first opening 201 on substrate 10. Thus, microlenses 4 can converge light emitted by light-emitting element 3 within first opening 201, thereby improving the luminous efficiency of light-emitting element 3.

[0122] In some embodiments, microlenses 4 include a plurality of micro-recessed structures 41 formed on the surface of substrate 10 near the pixel defining layer. Microlenses 4 also include a plurality of micro-protrusions 42 formed on the surface of first planar layer 12 near substrate 10. The plurality of micro-recessed structures 41 and the plurality of micro-protrusions 42 correspond one-to-one and are of matching size and shape. Microlenses 4 can converge and / or collimate light incident upon them from light-emitting elements 3, thereby further improving the luminous efficiency of light-emitting elements 3 and, consequently, the luminous efficiency of the display panel.

[0123] In some embodiments, referring to Figures 4a and 4b, Figure 4a is a schematic cross-sectional view of another structure of the display panel along the BB' section line in Figure 3a in the embodiment of the present disclosure; Figure 4b is a schematic cross-sectional view of another structure of the display panel along the BB' section line in Figure 3a in the embodiment of the present disclosure; different from the above embodiment, the driving substrate 1 further includes a first flat layer 12, which is located between the base 10 and the reflective structure 11, and a groove structure 122 is formed on a surface of the first flat layer 12 on one side close to the reflective structure 11, and the orthographic projection of the groove structure 122 on the base 10 surrounds the periphery of the first opening 201, and the orthographic projections of the groove structure 122 and the second opening 202 on the base 10 at least partially overlap; the orthographic projection of the reflective structure 11 on the base 10 at least covers the portion of the orthographic projection of the groove structure 122 on the base 10 close to the orthographic projection of the first opening 201 on the base 10.

[0124] Among them, the groove structure 122 can form a ring around the first opening 201, so that the reflective structure 11 can form a ring around the first opening 201, and the inner ring surface of the reflective structure 11 faces the area where the first opening 201 is located, so that the reflective structure 11 can reflect the light emitted by the light-emitting element 3 into the area surrounded by it; at the same time, the setting of the reflective structure 11 can make the light emitted by the light-emitting element 3 at a larger angle be reflected back by the reflective structure 11 into the light-emitting area of ​​the light-emitting element 3, thereby improving the light-emitting efficiency of the light-emitting element 3; at the same time, it can prevent the light emitted by the light-emitting element 3 at a larger angle from reaching the light-emitting area of ​​the adjacent light-emitting element 3, thereby preventing the light emitted by the adjacent light-emitting elements 3 from mixing and mixing, thereby adjusting or improving the light-emitting viewing angle of the light-emitting element 3, and preventing the viewing angle of the light-emitting element 3 from being reduced uncontrollably.

[0125] In some embodiments, the cross-sectional shape of the groove structure 122 perpendicular to the substrate 10 includes an inverted trapezoid or a semicircular shape. The depth of the inverted trapezoid ranges from 0.5 to 5 μm; the length of the longer base of the inverted trapezoid ranges from 1 to 20 μm; and the angle of the base of the inverted trapezoid ranges from 30° to 90°. This angle range facilitates the reflection structure 11 formed on the side of the groove structure 122 near the first opening 201 to reflect the light incident thereon toward the light-emitting region of the light-emitting element 3, thereby better improving or preventing light mixing and color mixing between adjacent light-emitting elements 3.

[0126] In some embodiments, the groove structure 122 is formed by directly digging a groove in the first planar layer 12 through a patterning process.

[0127] The other structural arrangements of the display panel in this embodiment except for the groove structure 122 are the same as those in the above embodiment and will not be described again here.

[0128] In some embodiments, the driver substrate 1 further includes a buffer layer 17, an encapsulation layer 18, and a cover plate 19. The buffer layer 17 is located between the driver transistor 130 and the first planar layer 12; the buffer layer 17 is made of an inorganic insulating material. The encapsulation layer 18 and the cover plate 19 are stacked sequentially on the side of the light-emitting element 3 facing away from the substrate 10. The encapsulation layer 18 encapsulates the light-emitting element 3, preventing damage from moisture and oxygen. The cover plate 19 protects the light-emitting element 3 and the encapsulation layer 18.

[0129] Based on the above structure of the display panel, the embodiment of the present disclosure also provides a method for preparing the display panel. Referring to Figure 5, there is a flow chart of the method for preparing the display panel in the embodiment of the present disclosure; wherein, the preparation method includes: preparing a driving substrate 1, and preparing a pixel defining layer 2 and a light-emitting element 3 on one side of the driving substrate 1.

[0130] The preparation of the light-emitting element 3 includes sequentially preparing a first electrode 31, a light-emitting functional layer 32, and a second electrode 33; the preparation of the pixel defining layer 2 includes opening a first opening 201 and a second opening 202 in the pixel defining layer 2; the light-emitting element 3 is located in the first opening 201; the orthographic projection of the second opening 202 on the driving substrate 1 surrounds the periphery of the orthographic projection of the first opening 201 on the driving substrate 1, and the second electrode 33 also extends into the second opening 202.

[0131] Preparing the driving substrate 1 includes preparing a reflective structure 11 on one side of the substrate 10 close to the pixel defining layer 2; the orthographic projection of the reflective structure 11 on the substrate 10 surrounds the periphery of the orthographic projection of the first opening 201 on the substrate 10, and the orthographic projection of the reflective structure 11 and the second opening 202 on the substrate 10 at least partially overlap.

[0132] In some embodiments, preparing the driving substrate 1 also includes preparing a first flat layer 12 between the base 10 and the reflective structure 11, and preparing the first flat layer 12 includes: coating a silicon series organic-inorganic hybrid resin material on the base 10; forming a pattern of the first flat layer 12, a pattern of the protruding structure 121, or a pattern of the groove structure through an exposure and development process or a dry etching process.

[0133] The orthographic projection of the protrusion structure 121 or the groove structure on the substrate 10 surrounds the periphery of the first opening 201, and the orthographic projection of the protrusion structure 121 or the groove structure and the second opening 202 on the substrate 10 at least partially overlap; the orthographic projection of the reflective structure 11 on the substrate 10 at least covers the portion of the orthographic projection of the protrusion structure 121 or the groove structure on the substrate 10 that is close to the orthographic projection of the first opening 201 on the substrate 10.

[0134] In some embodiments, a silicon-based organic-inorganic hybrid resin material with a temperature resistance of 300°C to 500°C is spin-coated onto substrate 10. A mask containing a pattern for the first planar layer 12 and a pattern for the protruding structure 121 or a pattern for the recessed structure is used to expose the organic-inorganic hybrid resin layer. The pattern for the first planar layer 12, the protruding structure 121, or the recessed structure is then developed. Alternatively, the pattern for the first planar layer 12, the protruding structure 121, or the recessed structure can be formed directly by dry etching. The formation of the protruding structure 121 or the recessed structure does not add any additional steps to the display panel manufacturing process.

[0135] In some embodiments, preparing the driving substrate 1 further includes preparing a pixel circuit 13 on a side of the substrate 10 close to the pixel defining layer 2 .

[0136] Fabricating the pixel circuit 13 includes fabricating a driving transistor 130 on a side of the first planar layer 12 facing away from the substrate 10 .

[0137] The preparation of the driving transistor 130 includes sequentially preparing an active layer 1301 , a gate insulating layer 1302 , a source electrode 1303 and a drain electrode 1304 of the same layer and material, and a gate electrode 1305 .

[0138] The reflective structure 11 , the source electrode 1303 , and the drain electrode 1304 are made of the same material and are manufactured through one patterning process; alternatively, the reflective structure 11 and the gate electrode 1305 are made of the same material and are manufactured through one patterning process.

[0139] The preparation of the reflective structure 11 does not add any additional steps to the preparation process of the display panel.

[0140] In some embodiments, the insulating film layer in the drive substrate 1 and the conductive patterns in the pixel circuit 13 are each fabricated using conventional patterning processes. The first electrode 31 and the second electrode 33 in the light-emitting element 3 are fabricated using conventional patterning processes, and the light-emitting functional layer 32 is fabricated using an evaporation process.

[0141] In some embodiments, other film layers in the display panel except for the above-mentioned structural film layer are prepared using traditional processes, which will not be described in detail here.

[0142] The display panel provided by the embodiment of the present disclosure forms a reflective electrode surrounding the light-emitting element by opening a second opening in the pixel defining layer and extending the second electrode into the second opening. The reflective electrode surrounding the light-emitting element can increase the reflective area of ​​the second electrode, so that the light emitted by the light-emitting element is reflected within its surrounding range, thereby improving the luminous efficiency of the light-emitting element, and further improving the luminous efficiency of the bottom-emitting display panel. However, the second electrode extending into the second opening easily causes light of different colors emitted by adjacent light-emitting elements to mix, thereby reducing the viewing angle of the light-emitting element. In this embodiment, a reflective structure is provided in the driving substrate, and the positive projection of the reflective structure on the substrate surrounds the positive projection of the first opening on the substrate. On the one hand, since the reflective structure can reflect the light emitted by the light-emitting element into the area surrounded by it, The reflective structure is equivalent to forming a reflective structure surrounding the light-emitting element in the driving substrate. The reflective structure can further increase the reflective area of ​​the second electrode, so that the light emitted by the light-emitting element is further reflected within its surrounding range, thereby improving the luminous efficiency of the light-emitting element, and further improving the luminous efficiency of the bottom-emitting display panel; on the other hand, the reflective structure provided in the driving substrate can reflect most of the light emitted by the light-emitting element at a larger angle into the area surrounded by it, thereby improving or avoiding the mixing of light emitted by adjacent light-emitting elements, and then improving or avoiding the mixing of light of different colors emitted by adjacent light-emitting elements, thereby adjusting the viewing angle of the light-emitting element and, at the same time, adjusting the degree to which the luminous efficiency can be improved by the second electrode surrounding the light-emitting element.

[0143] In a second aspect, an embodiment of the present disclosure further provides a display device, comprising the display panel in the above embodiment.

[0144] By adopting the display panel in the above embodiment, the luminous efficiency of the display device is improved, while poor color mixing of the display device is improved or avoided, and the viewing angle of the display device is increased.

[0145] The display device provided in the embodiments of the present disclosure may be any product or component with a display function, such as an OLED panel, an OLED TV, an OLED billboard, a display, a mobile phone, or a navigation system.

[0146] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display panel, wherein: The invention comprises a driving substrate, a pixel defining layer and a light emitting element, wherein the pixel defining layer is located on one side of the driving substrate. The light emitting element comprises a first electrode, a light emitting functional layer and a second electrode, wherein the first electrode, the light emitting functional layer and the second electrode are sequentially stacked away from the driving substrate; A first opening is formed in the pixel defining layer, and the light emitting element is located in the first opening; A second opening is further formed in the pixel defining layer, the orthographic projection of the second opening on the driving substrate surrounds the periphery of the orthographic projection of the first opening on the driving substrate, and the second electrode further extends into the second opening; The driving substrate comprises a base and a reflective structure, wherein the reflective structure is located on a side of the base close to the pixel defining layer, the orthographic projection of the reflective structure on the base surrounds the periphery of the orthographic projection of the first opening on the base, and the orthographic projections of the reflective structure and the second opening on the base at least partially overlap; The reflective structure can reflect the light emitted by the light emitting element toward the area surrounded by it.

2. The display panel according to claim 1, wherein: The driving substrate further includes a first flat layer located between the base and the reflective structure. A convex structure is formed on a surface of one side of the first flat layer close to the reflective structure, the orthographic projection of the convex structure on the substrate surrounds the periphery of the first opening, and the orthographic projection of the convex structure and the second opening on the substrate at least partially overlap; The orthographic projection of the reflective structure on the substrate at least covers a portion of the orthographic projection of the protruding structure on the substrate that is close to the orthographic projection of the first opening on the substrate.

3. The display panel according to claim 1, wherein: The driving substrate further includes a first flat layer located between the base and the reflective structure. A groove structure is formed on a surface of one side of the first flat layer close to the reflective structure, the orthographic projection of the groove structure on the substrate surrounds the periphery of the first opening, and the orthographic projection of the groove structure and the second opening on the substrate at least partially overlap; The orthographic projection of the reflective structure on the substrate at least covers a portion of the orthographic projection of the groove structure on the substrate that is close to the orthographic projection of the first opening on the substrate.

4. The display panel according to claim 2 or 3, wherein: The driving substrate further includes a pixel circuit located on a side of the substrate close to the pixel defining layer. The pixel circuit includes a driving transistor, which is located on a side of the first planar layer away from the substrate, and the driving transistor includes an active layer, a gate insulating layer, a source electrode, a drain electrode and a gate electrode, wherein the source electrode and the drain electrode are arranged in the same layer, and the active layer, the gate insulating layer, the source electrode, the drain electrode and the gate electrode are stacked in sequence away from the substrate; The reflective structure is made of the same layer and material as the source electrode and the drain electrode, or the reflective structure is made of the same layer and material as the gate electrode; The reflective structure and the second electrode are both made of opaque metal material.

5. The display panel according to claim 4, wherein: The driving substrate further includes a first insulating layer located between the pixel circuit and the pixel defining layer. The drain electrode and the gate electrode do not overlap with the orthographic projection of the first opening on the substrate; The active layer extends to the region of the orthographic projection of the first opening on the substrate, and the orthographic projection of the source electrode on the substrate is at least partially located in the region of the orthographic projection of the first opening on the substrate. The first electrode is electrically connected to the source electrode through a via hole provided in the first insulating layer; The reflective structure is located between the active layer and the first insulating layer, and the orthographic projections of the reflective structure and the active layer on the substrate partially overlap.

6. The display panel according to claim 5, wherein: The orthographic projections of the light-emitting functional layer and the via hole on the substrate do not overlap; The pixel defining layer is also located in the via hole and between the first electrode and the second electrode.

7. The display panel according to claim 6, wherein: It also includes a second planar layer located between the first insulating layer and the pixel defining layer. The via hole penetrates the second planar layer; A third opening is formed in the second flat layer, the orthographic projection of the third opening on the substrate surrounds the periphery of the first opening, and the orthographic projections of the third opening and the second opening on the substrate at least partially overlap; The second electrode also extends into the third opening.

8. The display panel according to claim 7, wherein: It also includes a color resist layer located between the first insulating layer and the second planar layer. The via hole also penetrates the color resist layer; A fourth opening is formed in the color resist layer, the orthographic projection of the fourth opening on the substrate surrounds the periphery of the first opening, and the orthographic projections of the fourth opening on the substrate at least partially overlap with those of the third opening and the second opening; The second electrode also extends into the fourth opening.

9. The display panel according to claim 2, wherein: The cross-sectional shape of the protrusion structure perpendicular to the base includes a trapezoid or a semicircle, The height of the trapezoid ranges from 0.5 to 5 μm; The length of the longer bottom side of the trapezoid is in the range of 1 to 20 μm; The base angle of the trapezoid ranges from 30° to 90°.

10. The display panel according to claim 3, wherein: The cross-sectional shape of the groove structure perpendicular to the base includes an inverted trapezoid or a semicircle, The depth of the inverted trapezoid ranges from 0.5 to 5 μm; The length of the longer bottom side of the inverted trapezoid is in the range of 1 to 20 μm; The base angle of the inverted trapezoid ranges from 30° to 90°.

11. The display panel according to claim 8, wherein: The second electrode extending into the second opening, the third opening, and the fourth opening forms a slope angle of 30° to 90°.

12. The display panel according to claim 2, wherein: The first flat layer is made of a silicon-based organic-inorganic hybrid resin material; The silicon series organic-inorganic hybrid resin material has a temperature tolerance range of 300°C to 500°C.

13. The display panel according to claim 5, wherein: The orthographic projections of the reflective structure and the first opening on the substrate do not overlap; The number of the light-emitting elements is multiple, and the multiple light-emitting elements are arranged in an array; The pixel circuit further comprises a plurality of light-proof conductive patterns, wherein the plurality of light-proof conductive patterns do not overlap with the orthographic projection of the first opening on the substrate; The opaque conductive pattern includes data lines, scan lines, power lines and touch signal lines. The orthographic projections of at least part of the data lines, the scan lines, the power lines and the touch signal lines on the substrate are located between the orthographic projections of the light emitting elements in adjacent columns on the substrate; The orthographic projections of at least part of the data lines, the scan lines, the power lines and the touch signal lines on the substrate are located between the orthographic projections of the light emitting elements in adjacent rows on the substrate.

14. The display panel according to claim 13, wherein: It also includes a plurality of micro lenses, located between the substrate and the first flat layer, wherein the plurality of micro lenses are arranged in an array. The array of microlenses at least overlaps with an orthographic projection of the first opening on the substrate.

15. The display panel according to claim 14, wherein: The microlens includes a plurality of micro-recessed structures disposed on a surface of the substrate close to the pixel defining layer. The microlens further includes a plurality of micro-protrusion structures formed on a surface of the first flat layer close to the substrate. The plurality of micro-depression structures correspond to the plurality of micro-protrusion structures one by one, and the sizes and shapes thereof are matched.

16. A display device, wherein: A display panel comprising any one of claims 1-15.

17. A method for preparing a display panel, wherein: The method comprises preparing a driving substrate, and preparing a pixel defining layer and a light-emitting element on one side of the driving substrate; The preparation of the light-emitting element includes sequentially preparing a first electrode, a light-emitting functional layer, and a second electrode; Preparing the pixel defining layer includes forming a first opening and a second opening in the pixel defining layer; The light emitting element is located in the first opening; The orthographic projection of the second opening on the driving substrate surrounds the periphery of the orthographic projection of the first opening on the driving substrate, and the second electrode further extends into the second opening; Preparing the driving substrate includes preparing a reflective structure on a side of the substrate close to the pixel defining layer; The orthographic projection of the reflective structure on the substrate surrounds the periphery of the orthographic projection of the first opening on the substrate, and the orthographic projections of the reflective structure and the second opening on the substrate at least partially overlap.

18. The method for preparing a display panel according to claim 17, wherein: The step of preparing the driving substrate further comprises preparing a first flat layer between the base and the reflective structure. The preparation of the first flat layer includes: coating a silicon series organic-inorganic hybrid resin material on the substrate; Forming a pattern of the first planar layer, a pattern of a protruding structure, or a pattern of a recessed structure by an exposure and development process or a dry etching process; The orthographic projection of the convex structure or the concave structure on the substrate surrounds the periphery of the first opening, and the orthographic projections of the convex structure or the concave structure and the second opening on the substrate at least partially overlap; The orthographic projection of the reflective structure on the substrate at least covers a portion of the orthographic projection of the protrusion structure or the groove structure on the substrate that is close to the orthographic projection of the first opening on the substrate.

19. The method for preparing a display panel according to claim 18, wherein: Preparing the driving substrate further includes preparing a pixel circuit on a side of the substrate close to the pixel defining layer; Preparing the pixel circuit includes preparing a driving transistor on a side of the first planar layer away from the substrate; The preparation of the driving transistor includes sequentially preparing an active layer, a gate insulating layer, a source electrode and a drain electrode of the same layer and the same material, and a gate electrode; The reflective structure, the source electrode, and the drain electrode are made of the same material and are manufactured through a single patterning process; or, the reflective structure and the gate electrode are made of the same material and are manufactured through a single patterning process.

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