Display panel, manufacturing method thereof, and display device

Abstract

Provided are a display panel, a manufacturing method thereof, and a display device. The display panel includes a first substrate; a plurality of light sources disposed on the first substrate; a second substrate disposed opposite to the first substrate; a light conversion structure disposed on the second substrate, the light conversion structure comprising at least a plurality of quantum dot structures; a plurality of extinction structures disposed on the side of the light conversion structure facing the first substrate, a first channel being formed between any two adjacent extinction structures; and a plurality of first optical structures disposed on the side of the light conversion structure facing the first substrate, the plurality of first optical structures being respectively located in the first channel between any two adjacent extinction structures; and a filling material portion disposed between the first substrate and the second substrate. The filling material portion is located between the plurality of light sources and the plurality of first optical structures. The refractive index of the material of the filling material portion is greater than the refractive index of the material of the first optical structure, and the extinction structure comprises a light absorbing material.

Description

Technical Field

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

[0002] Light-emitting diodes (LEDs) have the advantages of low power consumption and high brightness, while photoinduced quantum dots (QDs) have the advantages of wide color gamut and pure light color. Therefore, display technology using LED+QD structure has gradually become one of the research hotspots. In this type of display technology, blue light emitted by LEDs can usually be used to excite red and green photoinduced QD materials to achieve full-color display. Summary of the invention

[0003] In order to solve at least one aspect of the above problems, embodiments of the present disclosure provide a display panel, a method for manufacturing the display panel, and a display device.

[0004] In one aspect, a display panel is provided, the display panel comprising:

[0005] a first substrate; and

[0006] A plurality of light sources disposed on the first substrate;

[0007] a second substrate disposed opposite to the first substrate;

[0008] A light conversion structure disposed on the second substrate, the light conversion structure at least comprising a plurality of quantum dot structures;

[0009] A plurality of matt structures are arranged on a side of the light conversion structure facing the first substrate, wherein a first channel is formed between any two adjacent matt structures;

[0010] A plurality of first optical structures are arranged on a side of the light conversion structure facing the first substrate, wherein the plurality of first optical structures are respectively located in a first channel between any two adjacent extinction structures; and

[0011] a filling material portion disposed between the first substrate and the second substrate, wherein the filling material portion is located between the plurality of light sources and the plurality of first optical structures,

[0012] The refractive index of the material of the filling material part is greater than the refractive index of the material of the first optical structure, and the extinction structure comprises a light absorbing material; and

[0013] The orthographic projections of the multiple light sources on the first substrate at least partially overlap with the orthographic projections of the multiple first optical structures on the first substrate, the orthographic projections of the light conversion structure on the first substrate at least partially overlap with the orthographic projections of the multiple first optical structures on the first substrate, and the orthographic projections of the multiple first optical structures on the first substrate fall within the orthographic projections of the filling material portion on the first substrate.

[0014] According to some exemplary embodiments, the display panel further includes a matt layer disposed on the first substrate, the matt layer containing a light absorbing material, the matt layer being located on a side of the multiple light sources facing the second substrate, and an orthographic projection of the matt layer on the first substrate being located on at least one side of an orthographic projection of the multiple light sources on the first substrate.

[0015] According to some exemplary embodiments, the display panel also includes a light source protection layer arranged on the first substrate, the light source protection layer is located on the side of the light source facing the second substrate, the orthographic projection of the light source protection layer on the first substrate covers the orthographic projection of the light source on the first substrate; and the refractive index of the material of the light source protection layer is smaller than the refractive index of the material of the filling material portion.

[0016] According to some exemplary embodiments, the display panel also includes a plurality of light blocking structures arranged on the second substrate, the plurality of light blocking structures are located between the layer where the extinction structure is located and the layer where the light conversion structure is located; and the light blocking structures contain light blocking materials, a second channel is formed between any two adjacent light blocking structures, the orthographic projection of the second channel on the second substrate falls within the orthographic projection of the first channel on the second substrate, and a plurality of the first channels and a plurality of the second channels are respectively connected to form a plurality of light input channels.

[0017] According to some exemplary embodiments, the display panel also includes a plurality of quantum dot protection structures disposed on the second substrate, the plurality of quantum dot protection structures being located between the light conversion structure and the first optical structure, and the orthographic projections of the plurality of quantum dot protection structures on the second substrate being respectively located within the orthographic projections of the plurality of second channels on the second substrate.

[0018] According to some exemplary embodiments, the display panel also includes a plurality of retaining wall structures arranged on the second substrate, the plurality of retaining wall structures are located between the second substrate and the plurality of extinction structures, and the orthographic projections of the plurality of retaining wall structures on the second substrate are respectively located within the orthographic projections of the plurality of extinction structures on the second substrate.

[0019] According to some exemplary embodiments, a pixel opening is formed between any two adjacent retaining wall structures, and the orthographic projections of the plurality of pixel openings on the first substrate respectively cover the orthographic projections of the plurality of light input channels on the first substrate, and the orthographic projections of the plurality of pixel openings on the first substrate respectively cover the orthographic projections of the plurality of light sources on the first substrate.

[0020] According to some exemplary embodiments, the ratio of the refractive index of the material of the filling material portion to the refractive index of the material of the first optical structure is in the range of 1.1 to 1.5; and / or, the ratio of the refractive index of the material of the filling material portion to the refractive index of the material of the light source protection layer is in the range of 1.1 to 1.5; and / or, the refractive index of the material of the quantum dot protection structure is substantially equal to the refractive index of the material of the first optical structure.

[0021] According to some exemplary embodiments, the area of ​​the orthographic projection of each light inlet channel on the first substrate is 80% to 90% of the area of ​​the orthographic projection of the pixel opening covering it on the first substrate.

[0022] According to some exemplary embodiments, the surface of the extinction layer facing the second substrate is closer to the second substrate than the surface of the light source facing the second substrate, so that the extinction layer can absorb at least a portion of the light emitted from the light source and having an exit angle greater than a first specified angle.

[0023] According to some exemplary embodiments, the surface of the filling material portion facing the second substrate contacts the surface of the first optical structure away from the second substrate; and / or the surface of the filling material portion away from the second substrate contacts the surface of the light source protection layer away from the first substrate.

[0024] According to some exemplary embodiments, the thickness of the extinction structure is designed so that a portion of the light refracted at the interface between the filling material portion and the first optical structure is absorbed by the extinction structure, and an exit angle of the portion of the light is greater than a second specified angle.

[0025] According to some exemplary embodiments, the matte structure has a thickness between 8 and 15 micrometers.

[0026] According to some exemplary embodiments, the thickness of the filling material portion is between 3 and 8 microns; and / or the thickness of the light blocking structure is between 0.5 and 2 microns; and / or the thickness of the extinction layer is between 2 and 3 microns; and / or the thickness of the light source protection layer is between 500 and 1000 nanometers; and / or the thickness of the quantum dot protection structure is between 500 and 1000 nanometers; and / or the thickness of the retaining wall structure is between 6 and 15 microns.

[0027] According to some exemplary embodiments, the pixel opening includes a first sub-pixel opening and a second sub-pixel opening, the multiple quantum dot structures include a first quantum dot structure and a second quantum dot structure, the first quantum dot structure is used to convert light with a third wavelength range incident thereon into light with a first wavelength range, the second quantum dot structure is used to convert light with a third wavelength range incident thereon into light with a second wavelength range, the first wavelength range, the second wavelength range and the third wavelength range are different from each other; and the first quantum dot structure is located in the first sub-pixel opening, and the second quantum dot structure is located in the second sub-pixel opening.

[0028] According to some exemplary embodiments, the pixel opening further includes a third sub-pixel opening, and the display panel further includes scattering particles disposed in the third sub-pixel opening.

[0029] According to some exemplary embodiments, the plurality of light sources include a plurality of micro light emitting diodes or a plurality of sub-millimeter light emitting diodes.

[0030] According to some exemplary embodiments, the display panel also includes: a pixel driving circuit layer arranged on the first substrate, the pixel driving circuit layer including a plurality of thin film transistors, the plurality of thin film transistors including at least a driving transistor; and a plurality of pad groups arranged on the side of the pixel driving circuit layer facing the second substrate, each of the pad groups including a first pad and a second pad, wherein the first pad is electrically connected to the source or drain of the driving transistor, and the second pad is electrically connected to the negative power supply of the display panel; the plurality of light sources are located on the side of the pad group facing the second substrate, each of the light sources includes a first pin and a second pin, the first pin is electrically connected to the first pad, and the second pin is electrically connected to the second pad.

[0031] According to some exemplary embodiments, the plurality of light sources include a plurality of organic light emitting diodes.

[0032] According to some exemplary embodiments, the display panel also includes: a pixel driving circuit layer arranged on the first substrate, the pixel driving circuit layer including a plurality of thin film transistors, the plurality of thin film transistors including at least a driving transistor; and a plurality of organic light emitting diodes arranged on the side of the pixel driving circuit layer facing the second substrate, the organic light emitting diode including an anode arranged on the side of the pixel driving circuit layer facing the second substrate, an organic light emitting layer arranged on the side of the anode facing the second substrate, and a cathode arranged on the side of the organic light emitting layer facing the second substrate.

[0033] In another aspect, a display device is provided, comprising the display panel as described above.

[0034] In another aspect, a method for manufacturing a display panel is provided, the manufacturing method comprising:

[0035] forming a first substrate, wherein forming the first substrate comprises forming a plurality of light sources on a first substrate;

[0036] Forming a second substrate, the forming of the second substrate comprising: forming a light conversion structure on a second substrate, the light conversion structure comprising at least a plurality of quantum dot structures; forming a plurality of extinction structures on a side of the light conversion structure away from the second substrate by a patterning process, wherein a first channel is formed between any two adjacent extinction structures; and forming a plurality of first optical structures on a side of the light conversion structure away from the second substrate and in the plurality of first channels by a printing process;

[0037] aligning the first substrate and the second substrate; and

[0038] filling a filling material portion between the first substrate and the second substrate,

[0039] The refractive index of the material of the filling material part is greater than the refractive index of the material of the first optical structure, and the extinction structure comprises a light absorbing material; and

[0040] The orthographic projections of the multiple light sources on the first substrate at least partially overlap with the orthographic projections of the multiple first optical structures on the first substrate, the orthographic projections of the light conversion structure on the first substrate at least partially overlap with the orthographic projections of the multiple first optical structures on the first substrate, and the orthographic projections of the multiple first optical structures on the first substrate fall within the orthographic projections of the filling material portion on the first substrate.

[0041] In the display panel provided by the embodiment of the present disclosure, cross-coloring between pixels can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Other objects and advantages of the present disclosure will be apparent from the following description of the present disclosure with reference to the accompanying drawings, and will help to have a comprehensive understanding of the present disclosure.

[0043] Figure 1 is a schematic plan view of a display panel according to an embodiment of the present disclosure;

[0044] Figure 2 A display panel according to an embodiment of the present disclosure is Figure 1 A schematic cross-sectional view taken along line AA' in FIG.

[0045] Figure 3and Figure 4 A display panel according to an embodiment of the present disclosure is Figure 1 A schematic cross-sectional view taken along line AA' in FIG. 1 , which schematically shows a light path diagram of light rays emitted from a light source with various angles of incidence;

[0046] Figure 5 A display panel according to an embodiment of the present disclosure is Figure 1 A schematic cross-sectional view taken along line AA' in FIG. 1 , which schematically shows a light path diagram of light rays emitted from a light source with various angles of incidence;

[0047] Figure 6 yes Figure 2 A partial enlarged view of part I in FIG.

[0048] Figure 7 yes Figure 2 A partial enlarged view of part II in FIG.

[0049] Figure 8 is a partial cross-sectional view of a first substrate of a display panel according to some exemplary embodiments of the present disclosure, wherein a light source of the display panel includes an inorganic light emitting diode;

[0050] Fig. 9 is a partial cross-sectional view of a first substrate of a display panel according to some exemplary embodiments of the present disclosure, wherein a light source of the display panel includes an organic light emitting diode;

[0051] Fig.10 yes Figure 2 A partial enlarged view of part III in FIG.

[0052] Fig.11 A plan view of a display device according to an embodiment of the present disclosure is shown;

[0053] Fig.12 is a flow chart of a method for manufacturing a display panel according to an embodiment of the present disclosure; and

[0054] FIG. 13A to FIG. 13E They are Fig.12 is a cross-sectional view of a structure formed after some steps in the manufacturing method shown in FIG.

[0055] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the sizes of layers, structures or regions may be enlarged or reduced, that is, these drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0056] The technical solution of the present disclosure is further specifically described below through examples and in conjunction with the accompanying drawings. In the specification, the same or similar figure numbers indicate the same or similar parts. The following description of the embodiments of the present disclosure with reference to the accompanying drawings is intended to explain the overall inventive concept of the present disclosure and should not be construed as a limitation of the present disclosure.

[0057] In addition, in the following detailed description, for the purpose of explanation, numerous specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details.

[0058] It should be noted that the terms “on…”, “formed on…” and “disposed on…” mentioned herein may mean that one layer is directly formed or disposed on another layer, or may mean that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers.

[0059] It should be noted that, although the terms "first", "second", etc. may be used herein to describe various parts, components, elements, regions, layers and / or parts, these parts, components, elements, regions, layers and / or parts should not be limited by these terms. Instead, these terms are used to distinguish one part, component, element, region, layer and / or part from another. Thus, for example, the first part, first member, first element, first region, first layer and / or first part discussed below may be referred to as the second part, second member, second element, second region, second layer and / or second part without departing from the teachings of the present disclosure.

[0060] When a component (e.g., a first component) is connected or electrically connected to another component (e.g., a second component), it should be understood that one component is directly connected or electrically connected to another component or is connected or electrically connected to another component through any other component (e.g., a third component). On the other hand, when a component (e.g., a first component) is described as being "directly connected to," "directly coupled to," or "directly electrically connected to" another component (e.g., a second component), it can be understood that there is no other component (e.g., a third component) between the components.

[0061] In this article, the relative positional relationship between each feature in the embodiment of the present disclosure is described using an XYZ coordinate system. It should be understood that the X-axis, Y-axis, and Z-axis are not limited to the three axes of the rectangular coordinate system, and can be interpreted in a broader sense. For example, the X-axis, Y-axis, and Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purpose of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z such as XYZ, XYY, YZ, and ZZ.

[0062] Herein, unless otherwise specified, the expression "patterning process" generally includes steps such as photoresist coating, exposure, development, etching, photoresist stripping, etc. The expression "one-time patterning process" means a process of forming patterned layers, components, members, etc. using one mask.

[0063] It should be noted that, in this article, "thickness" refers to the dimension along the light emitting direction of the display panel. "Width" refers to the dimension along the direction perpendicular to the light emitting direction of the color display panel and parallel to the row direction of the pixel array on the display panel (i.e., the X direction shown in the figure).

[0064] In this article, inorganic light emitting diodes refer to light emitting elements made of inorganic materials, where LED refers to inorganic light emitting elements that are different from OLED. Specifically, inorganic light emitting elements may include sub-millimeter light emitting diodes (Mini Light Emitting Diode, abbreviated as Mini LED in English) and micro light emitting diodes (Micro Light Emitting Diode, abbreviated as Micro LED in English). Among them, micro light emitting diodes (i.e. Micro LED) refer to ultra-small light emitting diodes with a grain size of less than 100 microns, and sub-millimeter light emitting diodes (i.e. Mini LED) refer to small light emitting diodes with a grain size between MicroLED and traditional LED. For example, the grain size of Mini LED can be between 100 and 300 microns, and the grain size of Micro LED can be between 10 and 100 microns.

[0065] The inventors have found that in a display panel using photoluminescent quantum dots, there is usually a certain gap between the backlight source of the display panel and the layer where the photoluminescent quantum dots are located. Generally, the gap is greater than 10 μm. In this case, although a black matrix and a barrier wall structure can be set to block the light between adjacent pixels, it is still difficult to avoid color mixing between different pixels.

[0066] Embodiments of the present disclosure provide a display panel, a method for manufacturing the display panel, and a display device. The display panel includes a first substrate, the first substrate includes: a first substrate; and a plurality of light sources arranged on the first substrate; a second substrate arranged opposite to the first substrate, the second substrate includes: a second substrate; a light conversion structure arranged on the second substrate, the light conversion structure at least including a plurality of quantum dot structures; a plurality of extinction structures arranged on the side of the light conversion structure facing the first substrate, wherein a first channel is formed between any two adjacent extinction structures; and a plurality of first optical structures arranged on the side of the light conversion structure facing the first substrate, wherein the plurality of first optical structures are respectively located in the first channel between any two adjacent extinction structures; and a filling material portion arranged between the first substrate and the second substrate, wherein the refractive index of the material of the filling material portion is greater than the refractive index of the material of the first optical structure, and the extinction structure includes a light absorbing material; and the orthographic projections of the plurality of light sources on the first substrate at least partially overlap with the orthographic projections of the plurality of first optical structures on the first substrate, the orthographic projections of the light conversion structure on the first substrate at least partially overlap with the orthographic projections of the plurality of first optical structures on the first substrate, and the orthographic projections of the plurality of first optical structures on the first substrate fall within the orthographic projections of the filling material portion on the first substrate. In the display panel provided by the embodiment of the present disclosure, the collimated light emitted from the light source (i.e., the light with an exit angle less than a specified angle) can excite the quantum dot structure to achieve normal color display; the non-collimated light emitted from the light source (i.e., the light with an exit angle greater than a specified angle) can be blocked or absorbed to prevent these non-collimated lights from exciting the quantum dots in the adjacent pixels, thereby preventing cross-color from occurring between the pixels. In addition, the light scattered by the scattering particles in the quantum dots can be prevented from returning to the light source, thereby avoiding the optical crosstalk phenomenon.

[0067] Figure 1 is a schematic plan view of a display panel according to an embodiment of the present disclosure, Figure 2 A display panel according to an embodiment of the present disclosure is Figure 1 Schematic cross-sectional view taken along line AA' in FIG. Figure 1 and Figure 2 According to the embodiment of the present disclosure, the display panel 10 may include a first substrate 1 and a second substrate 5. The first substrate 1 and the second substrate 5 may be arranged opposite to each other. For example, the first substrate 1 may be a substrate provided with components such as a light source, and the second substrate 5 may be a substrate provided with components such as a color filter.

[0068] The first substrate 1 may include a first substrate 11 and a plurality of light sources 12 disposed on the first substrate 11 .

[0069] The second substrate 5 may include: a second substrate 51; a light conversion structure 52 arranged on the second substrate 51, the light conversion structure 52 including at least a plurality of quantum dot structures; a plurality of extinction structures 53 arranged on the side of the light conversion structure 52 facing the first substrate 1, wherein a first channel 54 is formed between any two adjacent extinction structures 53; and a plurality of first optical structures 55 arranged on the side of the light conversion structure 52 facing the first substrate 1, wherein the plurality of first optical structures 55 are respectively located in the first channel 54 between any two adjacent extinction structures 53.

[0070] The display panel 10 may further include a filling material portion 9 disposed between the first substrate 1 and the second substrate 5 .

[0071] In an embodiment of the present disclosure, the refractive index of the material of the filling material portion 9 is greater than the refractive index of the material of the first optical structure 55 , and the extinction structure 53 includes a light absorbing material.

[0072] like Figure 1 As shown, the orthographic projections of the multiple light sources 12 on the first substrate 11 at least partially overlap with the orthographic projections of the multiple first optical structures 55 on the first substrate 11, the orthographic projections of the light conversion structure 52 on the first substrate 11 at least partially overlap with the orthographic projections of the multiple first optical structures 55 on the first substrate 11, and the orthographic projections of the multiple first optical structures 55 on the first substrate 11 fall within the orthographic projections of the filling material portion 9 on the first substrate 11.

[0073] Figure 3 and Figure 4 A display panel according to an embodiment of the present disclosure is Figure 1 Schematic cross-sectional view taken along line AA' in FIG. 1 , which schematically shows the light path diagram of light rays with various angles of incidence emitted from the light source. Figure 3 and Figure 4 As shown, the collimated light emitted from the light source 12 (i.e., light with an exit angle less than a specified angle, such as Figure 3 The light L1 shown in FIG. 1 ) can pass through the filling material portion 9 and the first optical structure 55 to excite the quantum dot structure to achieve normal color display. The non-collimated light emitted from the light source 12 (i.e., the light with an exit angle greater than a specified angle, such as Figure 4 The light L2 and L3 shown in the figure can be blocked or absorbed to prevent these non-collimated lights from exciting the quantum dots in the adjacent pixels, and to prevent cross-color from occurring between the pixels. In addition, the light scattered by the scattering particles in the quantum dots (e.g. Figure 4 The light L4 shown in FIG. 1 returns to the light source, thereby avoiding the optical crosstalk phenomenon.

[0074] In the embodiment of the present disclosure, the first substrate 11 and the second substrate 51 may be rigid substrates or flexible substrates, including but not limited to glass substrates or polyimide (PI) substrates.

[0075] In an embodiment of the present disclosure, the plurality of light sources 12 may include a plurality of organic light emitting diodes or a plurality of inorganic light emitting diodes, such as Mini LEDs or Micro LEDs.

[0076] In the embodiments of the present disclosure, Figure 1 and Figure 2 , the display panel 10 may include a plurality of pixels PX, such as the area surrounded by the dotted line frame. It should be understood that the plurality of pixels PX may be arranged in an array, that is, including a plurality of rows and a plurality of columns. Figure 1 In FIG. 1 , only a part of the pixels of the display panel 10 is schematically shown, rather than all the pixels. Figure 1 In the embodiment of the present disclosure, the horizontal direction may be referred to as the row direction, and the vertical direction may be referred to as the column direction. Each pixel PX may include a plurality of sub-pixels SPX for emitting a plurality of different colors, for example, different colors such as red, green, blue, and yellow may be emitted to achieve color display. For example, the display panel according to the embodiment of the present disclosure may include at least 3 sub-pixels SPX, for example, the 3 sub-pixels SPX may include a first sub-pixel 10R for emitting light having a first wavelength range, a second sub-pixel 10G for emitting light having a second wavelength range, and a third sub-pixel 10B for emitting light having a third wavelength range.

[0077] In an embodiment of the present disclosure, each sub-pixel may include a sub-pixel opening. For example, the first sub-pixel 10R may include a first sub-pixel opening 561 , the second sub-pixel 10G may include a second sub-pixel opening 562 , and the third sub-pixel 10B may include a third sub-pixel opening 563 .

[0078] It should be noted that in Figure 1 In order to clearly show images such as dotted boxes and cross-section lines, the black matrix is ​​shown with a gray ground line; however, this is not to be regarded as a limitation to the embodiments of the present disclosure.

[0079] In this document, unless otherwise specified, the first wavelength range, the second wavelength range, and the third wavelength range are different from each other. For example, the first wavelength range, the second wavelength range, and the third wavelength range may correspond to a first color, a second color, and a third color, respectively. For another example, the first color, the second color, and the third color may refer to red, green, and blue, respectively. Of course, the display panel may also include pixels for emitting other colors, such as pixels emitting yellow light, which is not particularly limited in the embodiments of the present disclosure.

[0080] For example, the light conversion structure 52 may include a plurality of quantum dot structures for emitting different colors. For example, the first sub-pixel 10R may include a first quantum dot structure 521 for emitting light having a first wavelength range, and the second sub-pixel 10G may include a second quantum dot structure 522 for emitting light having a second wavelength range. Of course, the light conversion structure 52 may also include a quantum dot structure for emitting light having other wavelength ranges, such as a quantum dot structure for emitting yellow light.

[0081] In this article, the expression "quantum dot (QD)" is a semiconductor nanostructure that binds excitons in three spatial directions. Those skilled in the art should understand that quantum dots have the following characteristics: when excited by light of a predetermined wavelength, the quantum dot can convert the light of the predetermined wavelength into light of another predetermined wavelength, and the wavelength of the converted light of the other predetermined wavelength can be determined by factors such as the constituent material of the quantum dot, the shape of the quantum dot, and the size of the quantum dot.

[0082] For example, the first quantum dot structure 521 can be used to convert light with a third wavelength range (e.g., blue light) incident thereon into light with a first wavelength range (e.g., red light), and the second quantum dot structure 522 can be used to convert light with a third wavelength range (e.g., blue light) incident thereon into light with a second wavelength range (e.g., green light).

[0083] It should also be understood that, in this article, a quantum dot structure may include multiple quantum dots, for example, the first quantum dot structure 521 may include multiple first quantum dots 521, each of which may be used to convert the third color light incident thereon into the first color light. The second quantum dot structure 522 may include multiple second quantum dots 522, each of which may be used to convert the third color light incident thereon into the second color light.

[0084] For example, the material of the quantum dot can be selected from the commonly used quantum dot materials in the art, including but not limited to one or more selected from the following materials: CdS, CdSe, CdTe, ZnO, ZnS, ZnSe, ZnTe, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InSb, AlAs, AlP, CuInS, CuInSe, AlSb. Of course, the material of the quantum dot includes but is not limited to the several listed above, and other materials that are the same or similar to the above substances can also be applied. Those skilled in the art should also understand that the emission spectrum of the quantum dot can be controlled by changing the size of the quantum dot, that is, the quantum dot is formed into different sizes and can emit light of different colors. Taking zinc sulfide (ZnS) quantum dots as an example, the size of the quantum dot emitting red light is mainly about 9 to 10nm, the size of the quantum dot emitting yellow light is about 8nm, and the size of the quantum dot emitting green light is about 7nm.

[0085] For example, the plurality of first quantum dots 521 may be respectively disposed in the plurality of first sub-pixel openings 561 , and the plurality of second quantum dots 522 may be respectively disposed in the plurality of second sub-pixel openings 562 .

[0086] In some exemplary embodiments of the present disclosure, in combination with reference Figures 2 to 4 , the third sub-pixel 10B may include a transparent structure 523 that allows light incident thereon to directly pass through. For example, the transparent structure 523 of the third sub-pixel 10B may allow light having a third wavelength range (e.g., blue light) incident thereon to directly pass through. In some embodiments, scattering particles 5231 are provided in the transparent structure 523. Specifically, the scattering particles 5231 may be doped in a resin material, and then the resin material doped with the scattering particles 5231 may be used to fill the third sub-pixel opening 563. In this way, the scattering particles may enhance the light emitting effect and increase the light emitting viewing angle.

[0087] Combined with reference Figures 2 to 4 The light source 12 may include a light emitting diode (LED) that emits light having a third wavelength range (eg, blue light), that is, a blue light LED. For example, the light source 12 may emit blue light having a central wavelength of 450 nm and a half-peak width of 30-40 nm.

[0088] When the blue light emitted by the light source 12 is incident on the quantum dot structures 521, 522 and the transparent structure 523, the first quantum dot structure 521 can emit red light under the excitation of the blue light, that is, convert the blue light into red light; the second quantum dot structure 522 can emit green light under the excitation of the blue light, that is, convert the blue light into green light; the blue light directly transmits through the transparent structure 523. In this way, the first sub-pixel 10R emits red light, the second sub-pixel 10G emits green light, and the third sub-pixel 10B emits blue light, so that the display panel according to the embodiment of the present disclosure can achieve color display.

[0089] In the display panel and display device provided by the embodiments of the present disclosure, the light conversion structure of the display panel includes a quantum dot structure, which can utilize the advantages of quantum dots to achieve a display panel and display device with a high color gamut and a large viewing angle.

[0090] Optionally, in the embodiment of the present disclosure, scattering particles may also be provided in the first quantum dot structure 521 and the second quantum dot structure 522 to improve the conversion efficiency of blue light, thereby improving the light effect of the display panel. For example, a plurality of scattering particles are provided in the first quantum dot structure 521 and the second quantum dot structure 522. The scattering particles can scatter blue light, effectively increasing the optical distance and path of blue light in the quantum dot structure and the transparent structure, and increasing the probability of blue light being incident on each quantum dot, thereby increasing the light conversion rate of blue light into red light and green light. In this way, the overall light effect and viewing angle of the display panel are improved.

[0091] Continue to refer to Figure 2 , the first substrate 1 may further include an extinction layer 13 disposed on the first substrate 11, the extinction layer 13 comprising a light absorbing material. The extinction layer 13 is located on the side of the plurality of light sources 12 facing the second substrate 5, and the orthographic projection of the extinction layer 13 on the first substrate 11 surrounds the orthographic projections of the plurality of light sources 12 on the first substrate 11. That is, the orthographic projection of the extinction layer 13 on the first substrate 11 does not overlap with the orthographic projections of the plurality of light sources 12 on the first substrate 11, but the orthographic projection of the extinction layer 13 on the first substrate 11 surrounds the orthographic projections of the plurality of light sources 12 on the first substrate 11.

[0092] Figure 5 A display panel according to an embodiment of the present disclosure is Figure 1 Schematic cross-sectional view taken along line AA' in FIG. 1 , which schematically shows the light path diagram of light rays with various angles of incidence emitted from the light source. Figure 5 As shown, the extinction layer 13 can absorb a portion of the light L5 emitted from the light source 12 and having a light emission angle greater than a first specified angle. The first specified angle is related to factors such as the distance between the extinction layer 13 and the light source 12 and the thickness of the extinction layer 13. For example, the first specified angle may be about 75°.

[0093] Reference Figures 2 to 5 The first substrate 1 may further include a light source protection layer 14 disposed on the first substrate 11, and the light source protection layer 14 is located on the side of the light source 12 facing the second substrate 5. The orthographic projection of the light source protection layer 14 on the first substrate 11 covers the orthographic projection of the light source 12 on the first substrate 11.

[0094] The second substrate 5 may further include a plurality of light blocking structures 57 disposed on the second substrate 51, wherein the plurality of light blocking structures 57 are located between the layer where the light extinction structure 53 is located and the layer where the light conversion structure 52 is located. For example, the light blocking structure 57 includes a light blocking material.

[0095] A second channel 58 is formed between any two adjacent light blocking structures 57 , and the orthographic projection of the second channel 58 on the second substrate 51 falls within the orthographic projection of the first channel 54 on the second substrate 51 . Multiple first channels 54 and multiple second channels 58 are respectively connected to form multiple light input channels.

[0096] The second substrate 5 may further include a plurality of quantum dot protection structures 59 disposed on the second substrate 51, the plurality of quantum dot protection structures 59 being located between the light conversion structure 52 and the first optical structure 55, and the orthographic projections of the plurality of quantum dot protection structures 59 on the second substrate 51 being respectively located within the orthographic projections of the plurality of second channels 58 on the second substrate 51. In this way, the plurality of quantum dot protection structures 59 respectively protect the quantum dot structures located in each pixel opening. It should be noted that, in the third sub-pixel 10B, the quantum dot protection structure 59 is also disposed in the second channel 58 on the side of the transparent structure 523 facing the first substrate 1.

[0097] The second substrate 5 may further include a plurality of retaining wall structures 60 disposed on the second substrate 51 , wherein the plurality of retaining wall structures 60 are located between the second substrate 51 and the plurality of extinction structures 53 , and the orthographic projections of the plurality of retaining wall structures 60 on the second substrate 51 are respectively located within the orthographic projections of the plurality of extinction structures 53 on the second substrate 51 .

[0098] Reference Figure 2, the above-mentioned pixel openings 561, 562, 563 are located between any two adjacent retaining wall structures 60, and the orthographic projections of the pixel openings 561, 562, 563 on the first substrate 11 respectively cover the orthographic projections of the plurality of light inlet channels on the first substrate 11, and the orthographic projections of the pixel openings 561, 562, 563 on the first substrate 11 respectively cover the orthographic projections of the plurality of light sources 12 on the first substrate 11. In this way, the collimated light (i.e., the exit angle is less than the design angle, such as 60°) emitted from the light source 12 can pass through the filling material portion 9, enter the light inlet channel, and be incident on the quantum dot structure and the transparent structure located in each pixel opening.

[0099] It should be noted that in the embodiment of the present disclosure, the light that can directly enter the light input channel through the filling material part 9 and be incident on the quantum dot structure and the transparent structure located in each pixel opening is called collimated light. The maximum value of the exit angle of the collimated light emitted from the light source 12 can be designed. The maximum value of the exit angle can be called the design angle. For example, the design angle can be about 60°.

[0100] In the embodiment of the present disclosure, the retaining wall structure 60 , the light blocking structure 57 , the light extinction structure 53 and the light extinction layer 13 all include light absorbing material or light blocking material.

[0101] It should be noted that, in this article, "light-absorbing material" refers to a material with a high absorptivity to light (especially visible light), and the light-absorbing material can absorb most or all of the light incident on it; "light-blocking material" refers to a material with a low transmittance to light (especially visible light), and the light-blocking material can absorb most or all of the light incident on it, or can reflect and absorb most or all of the light incident on it.

[0102] The retaining wall structure 60 may include a light blocking material. For example, the retaining wall structure 60 may be a black retaining wall structure to absorb most or all of the light incident thereon. The retaining wall structure 60 may also be a gray retaining wall structure to reflect most or all of the light incident thereon.

[0103] The light blocking structure 57 may include a light blocking material. For example, the light blocking structure 57 may be a light blocking structure with a light absorbing property to absorb most or all of the light incident thereon. The light blocking structure 57 may also be a light blocking structure with a light reflecting property to reflect most or all of the light incident thereon.

[0104] The matte structure 53 may include a light absorbing material, such as a black light absorbing material, to absorb most or all of the light incident thereon.

[0105] The matte layer 13 may include a light absorbing material, such as a black light absorbing material, to absorb most or all of the light incident thereon.

[0106] In the embodiment of the present disclosure, the area of ​​the orthographic projection of each light inlet channel on the first substrate 11 is 70% to 90%, for example, 80% to 90%, of the area of ​​the orthographic projection of the pixel opening covering it on the first substrate 11. In this way, most of the collimated light can be irradiated on the quantum dot structure and the transparent structure located in each pixel opening, and the light scattered by the scattering particles in the quantum dot structure and the transparent structure near the edge of the pixel opening can be absorbed, thereby avoiding cross-color between adjacent pixels.

[0107] For example, the orthographic projections of the plurality of retaining wall structures 60 on the second substrate 51 are respectively located within the orthographic projections of the plurality of light blocking structures 57 on the second substrate 51. The orthographic projections of the plurality of light blocking structures 57 on the second substrate 51 are respectively substantially coincident with the orthographic projections of the plurality of extinction structures 53 on the second substrate 51. The orthographic projections of the plurality of extinction structures 53 on the first substrate 11 are respectively substantially coincident with the orthographic projections of the extinction layer 13 on the first substrate 11.

[0108] For example, the shape of the orthographic projection of each matt structure 53 on the first plane is a trapezoid, and the first plane is perpendicular to the surface of the filling material portion 9 away from the first substrate 1 and parallel to the direction X. The matt structure 53 has a first surface 531 facing the first substrate 11 and a second surface 532 facing the second substrate 51, and the area of ​​the first surface 531 can be greater than the area of ​​the second surface 532.

[0109] In some exemplary embodiments, the refractive index of the material of the filling material portion 9 is greater than the refractive index of the material of the first optical structure 55, that is, the first optical structure 55 is a low refractive index material portion, and the filling material portion 9 is a high refractive index material portion. For example, the ratio of the refractive index of the material of the filling material portion 9 to the refractive index of the material of the first optical structure 55 may be in the range of 1.1 to 1.5.

[0110] In some exemplary embodiments, the refractive index of the material of the filling material part 9 is greater than the refractive index of the material of the light source protection layer 14, that is, the light source protection layer 14 is a low refractive index material part, and the filling material part 9 is a high refractive index material part. For example, the ratio of the refractive index of the material of the filling material part 9 to the refractive index of the material of the light source protection layer 14 can be in the range of 1.1 to 1.5.

[0111] In some exemplary embodiments, the refractive index of the material of the quantum dot protection structure 59 is substantially equal to the refractive index of the material of the first optical structure 55. For example, the difference between the refractive indices of the two may fluctuate within ±5% of the refractive index of the material of the first optical structure 55.

[0112] In some exemplary embodiments, the surface of the filling material portion 9 facing the second substrate 51 contacts the surface of the first optical structure 55 away from the second substrate 51, and the surface of the filling material portion 9 away from the second substrate 51 contacts the surface of the light source protection layer 14 away from the first substrate 11. That is, the filling material portion 9 with a high refractive index is sandwiched between the light source protection layer 14 with a low refractive index and the first optical structure 55.

[0113] For the convenience of description, the interface between the light source protection layer 14 and the filling material part 9 is referred to as a first interface S1 , and the interface between the filling material part 9 and the first optical structure 55 is referred to as a second interface S2 .

[0114] Combined with reference Figures 2 to 5 Among the light rays of various angles emitted from the light source 12, there is a part of light rays L6, the angle of emission of which is slightly larger than 0°, for example, it can be in the range of about 0° to 10°, that is, this part of light rays is not emitted completely in the vertical direction, but has a certain angle of emission. When the light ray L6 is incident on the first interface S1, due to the matching of the low refractive index and the high refractive index of the light source protection layer 14 and the filling material part 9, the light ray L6 can be emitted from the first interface S1 basically in the vertical direction, thereby improving the effect of exciting the quantum dot structure. In addition, by matching the refractive index, the large-angle emitted light can be adjusted to an acceptable range, thereby improving the light efficiency.

[0115] For example, among the light rays of various angles emitted from the light source 12, there is a portion of light rays L2, and the emission angle of the portion of light rays L2 is relatively large, for example, it can be in the range of about 70° to 80°. When the light rays L2 are incident on the first interface S1, through the matching of the refractive index, the portion of light rays L2 can be incident on the bottom surface of the corresponding extinction structure 53 to be absorbed by the extinction structure 53. In this way, this portion of light rays can be prevented from being incident on adjacent pixels, thereby avoiding mutual interference between pixels.

[0116] For example, among the light rays of various angles emitted from the light source 12, there is a portion of light rays L7, the emission angle of which is particularly large, for example, in the range of about 80° to 89°. When the light rays L7 are incident on the first interface S1 and the second interface S2, through the matching of the refractive index, this portion of light rays L7 can be incident on the side wall of the corresponding extinction structure 53 to be absorbed by the extinction structure 53. In this way, this portion of light rays can be prevented from being incident on adjacent pixels, thereby avoiding mutual interference between pixels.

[0117] For example, among the light rays of various angles emitted from the light source 12, there is a part of light rays L8, and the angle of incidence of this part of light rays L8 is particularly large, for example, it can be in the range of about 80° to 89°. When the light ray L8 is incident on the second interface S2, this part of light ray L8 can be totally reflected at the second interface S2 through the matching of the refractive index, that is, this part of light ray L8 can be reflected back and then absorbed by the extinction layer 13 located below. For example, there can be a part of light ray L9, when the light ray L9 is incident on the second interface S2, this part of light ray L9 can be totally reflected at the second interface S2 through the matching of the refractive index, that is, this part of light ray L9 can be reflected back, and the reflected light ray L9 is reflected again on the light source 12, reflected onto the extinction layer 13, and then absorbed by the extinction layer 13. For example, there may be a portion of light L10. When the light L10 is incident on the second interface S2, this portion of light L10 can be totally reflected at the second interface S2 due to the matching of the refractive index, that is, this portion of light L10 can be reflected back, and the reflected light L10 is reflected again on the light source 12 and is reflected to the bottom surface of the extinction structure 53 to be absorbed by the extinction structure 53. For example, there may be a portion of light L11. When the light L11 is incident on the second interface S2, this portion of light L11 can be totally reflected at the second interface S2 due to the matching of the refractive index, that is, this portion of light L11 can be reflected back, and the reflected light L11 is reflected again on the light source 12 and is reflected to the side wall of the extinction structure 53 to be absorbed by the extinction structure 53.

[0118] In the embodiments of the present disclosure, by providing a high refractive index material portion and a low refractive index material portion, non-collimated light (i.e., light emitted at an angle greater than the design angle) can be incident on the extinction layer or the extinction structure, which is beneficial for the absorption of these non-collimated light rays, thereby avoiding the occurrence of cross-color phenomenon between pixels.

[0119] like Figure 5 As shown, the extinction layer 13 is located at a position higher than the light source 13, that is, the surface of the extinction layer 13 facing the second substrate 5 is closer to the second substrate 5 than the surface of the light source 12 facing the second substrate 5, so that the extinction layer 13 can absorb at least a portion of the light L5 emitted from the light source 12 and the light emission angle is greater than the first specified angle.

[0120] Figure 7 yes Figure 2 A partial enlarged view of part II in FIG. Figure 2 and Figure 7 In some exemplary embodiments, the light source protection layer 14 may include a first protection layer 141 and a second protection layer 142. The first protection layer 141 may be an inorganic protection layer, and the second protection layer 142 may be a covering layer.

[0121] The first substrate 1 may include a first planarization layer 16, and the first planarization layer 16 may include a plurality of openings 15. The plurality of light sources 12 are respectively disposed in the plurality of openings 15. The first protective layer 141 may be disposed on a side of the first planarization layer 16 away from the first substrate 11, and covers the first planarization layer 16 and the plurality of light sources 12. The second protective layer 142 may be disposed on a side of the first protective layer 141 away from the first substrate 11. The matte layer 13 may be disposed on a side of the second protective layer 142 away from the first substrate 11.

[0122] Figure 6 yes Figure 2 A partial enlarged view of part I in FIG. Figure 2 and Figure 6 In the embodiment of the present disclosure, the thickness of the matt structure 53 can be designed. For example, the thickness of the matt structure 53 can be designed so that a portion of the light refracted at the interface (i.e., the second interface S2) between the filling material portion 9 and the first optical structure 55 is absorbed by the matt structure 53, and the exit angle of the portion of the light is greater than the second specified angle. For example, the second specified angle can be substantially equal to the design angle, such as about 60°.

[0123] For example, in a specific embodiment, the width of the pixel opening may be about 50 microns, and correspondingly, the width of the second channel 58 is about 30 microns. The design requires that among the light rays of various angles emitted from the second interface S2, the emission angle ( Figure 6 Light with an angle θ) less than or equal to 60° can pass through the second channel 58, and light with an exit angle greater than 60° is absorbed by the extinction structure 53. In this case, the thickness of the extinction structure 53 is equal to 30 microns*cos60°, that is, equal to about 15 microns.

[0124] Therefore, in the embodiment of the present disclosure, taking into account the actual size of each pixel opening, the thickness of the extinction structure 53 can be set between 8 and 15 microns. In this way, light with an incidence angle less than or equal to the design angle can be incident on the quantum dot structure, and light with an incidence angle greater than the design angle can be absorbed by the extinction structure, thereby meeting the design requirements.

[0125] In the embodiment of the present disclosure, the thickness of the filling material portion 9 can be set between 3 and 8 microns, so that the filling material portion 9 can fill the gap between the first substrate 1 and the second substrate 5, and can also play a role in adjusting the exit angle of the light emitted from the light source 12.

[0126] The thickness of the light blocking structure 57 can be set between 0.5 and 2 microns. The thickness of the extinction layer 13 can be set between 2 and 3 microns. The thickness of the light source protection layer 14 is between 500 and 1000 nanometers. The thickness of the quantum dot protection structure 59 is between 500 and 1000 nanometers. The thickness of the retaining wall structure 60 is between 6 and 15 microns.

[0127] In an embodiment of the present disclosure, the plurality of light sources 12 may include a plurality of micro light emitting diodes or a plurality of sub-millimeter light emitting diodes. Figure 8 1 is a partial cross-sectional view of a first substrate of a display panel according to some exemplary embodiments of the present disclosure, wherein a light source of the display panel includes an inorganic light emitting diode, for example, a micro light emitting diode or a plurality of sub-millimeter light emitting diodes.

[0128] Combined with reference Figure 2 and Figure 8 , the first substrate 1 may further include: a pixel driving circuit layer 20 disposed on the first substrate 11, the pixel driving circuit layer 20 includes a plurality of thin film transistors, the plurality of thin film transistors at least including a driving transistor T1; and a plurality of pad groups disposed on the side of the pixel driving circuit layer 20 facing the second substrate 5, each of the pad groups including a first pad 31 and a second pad 32. The first pad 31 is electrically connected to the source or drain of the driving transistor T1, and the second pad 32 is electrically connected to the negative power supply VSS of the display panel. The plurality of light sources 12 are located on the side of the pad group facing the second substrate 5, and each light source 12 includes a first pin 121 and a second pin 122, the first pin 121 is electrically connected to the first pad 31, and the second pin 122 is electrically connected to the second pad 32.

[0129] In some exemplary embodiments, Figure 8 As shown, the pixel driving circuit layer 20 may include: an active layer 21 , a first conductive layer 22 , a second conductive layer 23 , a third conductive layer 24 and a fourth conductive layer 25 .

[0130] The gate of each thin film transistor may be located in the first conductive layer 22. For example, the gate G1 of the driving transistor T1 and the first plate C1 of the storage capacitor may be located in the first conductive layer 22.

[0131] The second electrode plate C2 of the storage capacitor may be located in the second conductive layer 23. The first electrode plate C1 and the second electrode plate C2 are disposed opposite to each other and spaced apart, with a dielectric layer disposed therebetween, to form a storage capacitor.

[0132] The source and drain of each thin film transistor may be located in the third conductive layer 24. For example, the source S1 and the drain D1 of the driving transistor may be located in the third conductive layer 23. The data line 231 may be located in the third conductive layer 23.

[0133] A positive power electrode VDD and a negative power electrode VSS of the display panel may be located in the fourth conductive layer 25 .

[0134] The first substrate 1 may further include an insulating film layer disposed between any two adjacent layers of the active layer 21, the first conductive layer 22, the second conductive layer 23, the third conductive layer 24, and the fourth conductive layer 25. For example, the insulating film layer may include: a first gate insulating layer 26 disposed between the active layer 21 and the first conductive layer 22, a second gate insulating layer 27 disposed between the first conductive layer 22 and the second conductive layer 23, an interlayer dielectric layer 28 disposed between the second conductive layer 23 and the third conductive layer 24, and a second planarization layer 29 disposed between the third conductive layer 24 and the fourth conductive layer 25. In addition, the first substrate 1 may further include a third planarization layer 35 disposed on a side of the fourth conductive layer 25 away from the first substrate 11.

[0135] The first pad 31 is electrically connected to the drain electrode D1 of the driving transistor T1 through the first connection portion 36 and the second connection portion 37 , and the second pad 32 is electrically connected to the negative power source VSS through the third connection portion 38 .

[0136] The first electrode plate C1 is electrically connected to the positive power source VDD through the fourth connecting portion 39 .

[0137] It should be noted that the first pad 31 and the second pad 32 may include conductive materials such as indium tin oxide, metal copper, and nickel-gold alloy.

[0138] Under the control of the pixel driving circuit of each sub-pixel, the inorganic light emitting diode of each sub-pixel can be selectively controlled to emit light, thereby displaying the required image or picture.

[0139] In an embodiment of the present disclosure, the plurality of light sources 12 may include a plurality of organic light emitting diodes. Fig. 9 is a partial cross-sectional view of a first substrate of a display panel according to some exemplary embodiments of the present disclosure, wherein a light source of the display panel includes an organic light emitting diode.

[0140] Combined with reference Figure 2 and Fig. 9 , the first substrate 1 may further include: a pixel driving circuit layer 20 disposed on the first substrate 11, the pixel driving circuit layer 20 including a plurality of thin film transistors; and

[0141] A plurality of organic light emitting diodes 40 are arranged on the side of the pixel driving circuit layer 20 facing the second substrate 5, and the organic light emitting diodes 40 include an anode 41 arranged on the side of the pixel driving circuit layer 20 facing the second substrate 5, an organic light emitting layer 42 arranged on the side of the anode 41 facing the second substrate 5, and a cathode 43 arranged on the side of the organic light emitting layer 42 facing the second substrate 5.

[0142] In some exemplary embodiments, Fig. 9 As shown, the pixel driving circuit layer 20 may include: an active layer 21 , a first conductive layer 22 , a second conductive layer 23 , a third conductive layer 24 and a fourth conductive layer 25 .

[0143] The gate of each thin film transistor may be located in the first conductive layer 22. For example, the gate of the transistor and the first plate C1 of the storage capacitor may be located in the first conductive layer 22.

[0144] The second electrode plate C2 of the storage capacitor may be located in the second conductive layer 23. The first electrode plate C1 and the second electrode plate C2 are disposed opposite to each other and spaced apart, with a dielectric layer disposed therebetween, to form a storage capacitor.

[0145] The source and drain of each thin film transistor may be located in the third conductive layer 24. For example, the source S1 and the drain D1 of the driving transistor may be located in the third conductive layer 23.

[0146] The first connection part 44 and the second connection part 45 may be located in the fourth conductive layer 25 .

[0147] The first substrate 1 may further include an insulating film layer disposed between any two adjacent layers of the active layer 21, the first conductive layer 22, the second conductive layer 23, the third conductive layer 24, and the fourth conductive layer 25. For example, the insulating film layer may include: a first gate insulating layer 26 disposed between the active layer 21 and the first conductive layer 22, a second gate insulating layer 27 disposed between the first conductive layer 22 and the second conductive layer 23, an interlayer dielectric layer 28 disposed between the second conductive layer 23 and the third conductive layer 24, and a second planarization layer 29 disposed between the third conductive layer 24 and the fourth conductive layer 25. In addition, the first substrate 1 may further include a third planarization layer 35 disposed on a side of the fourth conductive layer 25 away from the first substrate 11.

[0148] The anode 41 may be electrically connected to a drain of a transistor via a first connection portion 44 .

[0149] Fig.10 yes Figure 2 A partial enlarged view of part III in FIG. Figure 2 and Fig.10The second substrate 5 may further include a filter layer 70, which is disposed between the second substrate 51 and the layer where the quantum dot structure and the transparent structure are located. The filter layer 70 may include a plurality of filter structures for allowing light of different colors to pass through. For example, the plurality of filter structures may be disposed in a one-to-one correspondence with the plurality of sub-pixels. Fig.10 As shown, the filter layer 70 may include a first filter structure 701, a second filter structure 702, and a third filter structure 703. It should be understood that the first sub-pixel 10R includes the first filter structure 701, the second sub-pixel 10G includes the second filter structure 702, and the third sub-pixel 10B includes the third filter structure 703. The first filter structure 701 is used to allow light of the first color to pass through, the second filter structure 702 is used to allow light of the second color to pass through, and the third filter structure 703 is used to allow light of the third color to pass through.

[0150] Specifically, the first filter structure 701 is arranged correspondingly to the first quantum dot structure 521, that is, the first sub-pixel 10R includes the first filter structure 701 and the first quantum dot structure 521, and the orthographic projection of the first quantum dot structure 521 on the second substrate 51 falls within the orthographic projection of the first filter structure 701 on the second substrate 51. The second filter structure 702 is arranged correspondingly to the second quantum dot structure 522, that is, the second sub-pixel 10G includes the second filter structure 702 and the second quantum dot structure 522, and the orthographic projection of the second quantum dot structure 522 on the second substrate 51 falls within the orthographic projection of the second filter structure 702 on the second substrate 51, for example, the area of ​​the orthographic projection of the second quantum dot structure 522 on the second substrate 51 is smaller than the area of ​​the orthographic projection of the second filter structure 702 on the second substrate 51. The third filter structure 703 is arranged corresponding to the transparent structure 523 , that is, the third sub-pixel 10B includes the third filter structure 703 and the transparent structure 523 , and the orthographic projection of the transparent structure 523 on the second substrate 51 falls within the orthographic projection of the third filter structure 703 on the second substrate 51 .

[0151] The filter layer 70 can be arranged between the second substrate 51 and the layer where the quantum dot structure and the transparent structure are located, that is, the filter layer 70 can be arranged on the light-emitting side of the quantum dot structure and the transparent structure. As described above, the first quantum dot structure 521 and the second quantum dot structure 523 can convert blue light into red light and green light respectively. In addition, there is part of the blue light that has not been converted by the first quantum dot structure 521 and the second quantum dot structure 523. By setting the filter layer 70, this part of the blue light can be absorbed, avoiding the mixing of blue light in the red light emitted from the first sub-pixel and the green light emitted from the second sub-pixel, thereby further improving the color gamut of the display panel. Furthermore, the filter layer 70 can also absorb external light to avoid poor display caused by external light exciting the quantum dot structure.

[0152] Optionally, refer to Fig.10 The display panel 10 may further include a black matrix 72. It should be understood that the black matrix 72 may separate pixels and prevent light leakage and color crosstalk.

[0153] It should be understood that the arrangement of the black matrix 72 may refer to the arrangement of the black matrix in a conventional display panel, and will not be described in detail here.

[0154] The embodiment of the present disclosure further provides a display device, comprising the display panel provided by the above embodiment. Fig.11 , which shows a plan view of a display device according to an embodiment of the present disclosure, and the display device 700 may include any of the display panels described above. For example, the display device may be any product or component with a display function, such as a smart phone, a wearable smart watch, smart glasses, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, a car display, an e-book, or the like.

[0155] Fig.12 is a flow chart of a method for manufacturing a display panel according to an embodiment of the present disclosure. FIG. 13A to FIG. 13E They are Fig.12 A cross-sectional view of a structure formed after some steps of the manufacturing method shown in FIG. Figure 2 , Fig.12 and Figures 13A to 13E , the manufacturing method may include at least the following steps.

[0156] In step S121 , a first substrate 1 is formed.

[0157] For example, forming the first substrate 1 may include forming a plurality of light sources 12 on the first substrate 11 .

[0158] Combined with reference Figure 8 and Fig. 9 The forming of the first substrate 1 may include forming the pixel driving circuit layer 20 on the first substrate 11, and then forming a plurality of light sources 12 on a side of the pixel driving circuit layer 20 away from the first substrate 11, so that the plurality of light sources 12 are electrically connected to respective pixel driving circuits.

[0159] The forming of the first substrate 1 may further include: forming a light source protection layer 14 on a side of the layer where the light source 12 is located away from the first substrate 11; and forming a matte layer 13 on a side of the light source protection layer 14 away from the first substrate 11. For example, the light source protection layer 14 may be formed by a chemical deposition process, and the matte layer 13 may be formed by a patterning process.

[0160] In step S122 , the second substrate 5 is formed.

[0161] The forming of the second substrate 5 may include: forming a light conversion structure 52 on a second substrate 51, wherein the light conversion structure 52 includes at least a plurality of quantum dot structures; forming a plurality of extinction structures 53 on a side of the light conversion structure 52 away from the second substrate 52 through a patterning process, wherein a first channel 54 is formed between any two adjacent extinction structures 53; and forming a plurality of first optical structures 55 on a side of the light conversion structure 52 away from the second substrate 51 and in the plurality of first channels 54 through a printing process.

[0162] In step S122, a retaining wall structure 60 may be formed by a patterning process, and the retaining wall structure 60 surrounds and forms a plurality of pixel openings. In the plurality of pixel openings, a plurality of quantum dot structures are formed by a printing process to form a light conversion structure 52. For example, a quantum dot protection layer 59 is formed on a side of the light conversion structure 52 away from the second substrate 51 by a chemical deposition process. Then, a light blocking structure 57 is formed on a side of the retaining wall structure 60 away from the second substrate 51 by a patterning process. An extinction structure 53 is formed on a side of the light blocking structure 57 away from the second substrate 51 by a patterning process. A first channel 54 is formed between any two adjacent extinction structures 53. A plurality of first optical structures 55 are formed on a side of the quantum dot protection layer 59 away from the second substrate 51 and in a plurality of the first channels 54 by a printing process.

[0163] In step S123 , the first substrate 1 and the second substrate 5 are aligned.

[0164] In step S124 , the filling material portion 9 is filled between the first substrate 1 and the second substrate 5 .

[0165] It should be noted that, according to some embodiments of the present disclosure, some steps in the above manufacturing method can be performed individually or in combination, and can be performed in parallel or sequentially, and are not limited to Fig.12 The specific operation sequence shown.

[0166] Although some embodiments of the general inventive concept of the present disclosure have been illustrated and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A display panel, characterized in that: The display panel comprises: a first substrate; and A plurality of light sources disposed on the first substrate; a second substrate disposed opposite to the first substrate; A light conversion structure disposed on the second substrate, the light conversion structure at least comprising a plurality of quantum dot structures; A plurality of matt structures are arranged on a side of the light conversion structure facing the first substrate, wherein a first channel is formed between any two adjacent matt structures; A plurality of first optical structures are arranged on a side of the light conversion structure facing the first substrate, wherein the plurality of first optical structures are respectively located in a first channel between any two adjacent extinction structures; and a filling material portion disposed between the first substrate and the second substrate, wherein the filling material portion is located between the plurality of light sources and the plurality of first optical structures, The refractive index of the material of the filling material part is greater than the refractive index of the material of the first optical structure, and the extinction structure comprises a light absorbing material; and The orthographic projections of the multiple light sources on the first substrate at least partially overlap with the orthographic projections of the multiple first optical structures on the first substrate, the orthographic projections of the light conversion structure on the first substrate at least partially overlap with the orthographic projections of the multiple first optical structures on the first substrate, and the orthographic projections of the multiple first optical structures on the first substrate fall within the orthographic projections of the filling material portion on the first substrate.

2. The display panel according to claim 1, characterized in that: The display panel also includes an extinction layer arranged on the first substrate, the extinction layer contains a light-absorbing material, the extinction layer is located on the side of the multiple light sources facing the second substrate, and the orthographic projection of the extinction layer on the first substrate is located on at least one side of the orthographic projection of the multiple light sources on the first substrate.

3. The display panel according to claim 2, characterized in that: The display panel further includes a light source protection layer disposed on the first substrate, the light source protection layer is located on a side of the light source facing the second substrate, and the orthographic projection of the light source protection layer on the first substrate covers the orthographic projection of the light source on the first substrate; as well as The refractive index of the material of the light source protection layer is smaller than the refractive index of the material of the filling material part.

4. The display panel according to any one of claims 1 to 2, characterized in that: The display panel further comprises a plurality of light blocking structures disposed on the second substrate, wherein the plurality of light blocking structures are located between the layer where the extinction structure is located and the layer where the light conversion structure is located; as well as The light blocking structure includes a light blocking material, and a second channel is formed between any two adjacent light blocking structures. The orthographic projection of the second channel on the second substrate falls within the orthographic projection of the first channel on the second substrate. Multiple first channels and multiple second channels are respectively connected to form multiple light input channels.

5. The display panel according to claim 3, characterized in that: The display panel further comprises a plurality of light blocking structures disposed on the second substrate, wherein the plurality of light blocking structures are located between the layer where the extinction structure is located and the layer where the light conversion structure is located; as well as The light blocking structure includes a light blocking material, and a second channel is formed between any two adjacent light blocking structures. The orthographic projection of the second channel on the second substrate falls within the orthographic projection of the first channel on the second substrate. Multiple first channels and multiple second channels are respectively connected to form multiple light input channels.

6. The display panel according to claim 5, characterized in that: The display panel also includes a plurality of quantum dot protection structures arranged on the second substrate, the plurality of quantum dot protection structures are located between the light conversion structure and the first optical structure, and the orthographic projections of the plurality of quantum dot protection structures on the second substrate are respectively located within the orthographic projections of the plurality of second channels on the second substrate.

7. The display panel according to claim 6, characterized in that: The display panel also includes a plurality of retaining wall structures arranged on the second substrate, the plurality of retaining wall structures are located between the second substrate and the plurality of extinction structures, and the orthographic projections of the plurality of retaining wall structures on the second substrate are respectively located within the orthographic projections of the plurality of extinction structures on the second substrate.

8. The display panel according to claim 7, characterized in that: A pixel opening is formed between any two adjacent retaining wall structures, and the orthographic projections of the multiple pixel openings on the first substrate respectively cover the orthographic projections of the multiple light input channels on the first substrate, and the orthographic projections of the multiple pixel openings on the first substrate respectively cover the orthographic projections of the multiple light sources on the first substrate.

9. The display panel according to claim 6 or 7, characterized in that: The ratio of the refractive index of the material of the filling material portion to the refractive index of the material of the first optical structure is in the range of 1.1 to 1.5; and / or, The ratio of the refractive index of the material of the filling material part to the refractive index of the material of the light source protection layer is in the range of 1.1 to 1.5; and / or, The refractive index of the material of the quantum dot protection structure is substantially equal to the refractive index of the material of the first optical structure.

10. The display panel according to claim 6 or 7, characterized in that: The area of ​​the orthographic projection of each light inlet channel on the first substrate is 80% to 90% of the area of ​​the orthographic projection of the pixel opening covering it on the first substrate.

11. The display panel according to claim 2 or 3, characterized in that: The surface of the matt layer facing the second substrate is closer to the second substrate than the surface of the light source facing the second substrate, so that the matt layer can absorb at least a portion of the light emitted from the light source and having an exit angle greater than a first specified angle.

12. The display panel according to claim 3, characterized in that: The surface of the filling material portion facing the second substrate is in contact with the surface of the first optical structure away from the second substrate; and / or, A surface of the filling material portion away from the second substrate contacts a surface of the light source protection layer away from the first substrate.

13. The display panel according to claim 12, characterized in that: The thickness of the extinction structure is designed so that a portion of the light refracted at the interface between the filling material portion and the first optical structure is absorbed by the extinction structure, and an emission angle of the portion of the light is greater than a second specified angle.

14. The display panel according to claim 13, characterized in that: The thickness of the matte structure is between 8 and 15 microns.

15. The display panel according to claim 7, characterized in that: The thickness of the filling material portion is between 3 and 8 micrometers; and / or, The thickness of the light blocking structure is between 0.5 and 2 micrometers; and / or, The thickness of the matt layer is between 2 and 3 micrometers; and / or, The thickness of the light source protection layer is between 500 and 1000 nanometers; and / or, The thickness of the quantum dot protection structure is between 500 and 1000 nanometers; and / or, The thickness of the retaining wall structure is between 6 and 15 microns.

16. The display panel according to claim 8, characterized in that: The pixel opening includes a first sub-pixel opening and a second sub-pixel opening, the plurality of quantum dot structures include a first quantum dot structure and a second quantum dot structure, the first quantum dot structure is used to convert light with a third wavelength range incident thereon into light with a first wavelength range, the second quantum dot structure is used to convert light with a third wavelength range incident thereon into light with a second wavelength range, the first wavelength range, the second wavelength range and the third wavelength range are different from each other; and The first quantum dot structure is located in the first sub-pixel opening, and the second quantum dot structure is located in the second sub-pixel opening.

17. The display panel according to claim 16, characterized in that: The pixel opening further includes a third sub-pixel opening, and the display panel further includes scattering particles arranged in the third sub-pixel opening.

18. The display panel according to any one of claims 1 to 3, characterized in that: The plurality of light sources include a plurality of micro light emitting diodes or a plurality of sub-millimeter light emitting diodes.

19. The display panel according to claim 18, characterized in that: The display panel further includes: A pixel driving circuit layer disposed on the first substrate, the pixel driving circuit layer comprising a plurality of thin film transistors, the plurality of thin film transistors at least including a driving transistor; and A plurality of pad groups are arranged on the side of the pixel driving circuit layer facing the second substrate, each of the pad groups includes a first pad and a second pad, Wherein, the first pad is electrically connected to the source or drain of the driving transistor, and the second pad is electrically connected to the negative electrode of the power supply of the display panel; The multiple light sources are located on a side of the pad group facing the second substrate, and each of the light sources includes a first pin and a second pin, the first pin is electrically connected to the first pad, and the second pin is electrically connected to the second pad.

20. The display panel according to any one of claims 1 to 3, characterized in that: The plurality of light sources include a plurality of organic light emitting diodes.

21. The display panel according to claim 20, characterized in that: The display panel further includes: A pixel driving circuit layer disposed on the first substrate, the pixel driving circuit layer comprising a plurality of thin film transistors, the plurality of thin film transistors at least including a driving transistor; and A plurality of organic light emitting diodes are arranged on the side of the pixel driving circuit layer facing the second substrate, and the organic light emitting diodes include an anode arranged on the side of the pixel driving circuit layer facing the second substrate, an organic light emitting layer arranged on the side of the anode facing the second substrate, and a cathode arranged on the side of the organic light emitting layer facing the second substrate.

22. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 21.

23. A method for manufacturing a display panel, characterized in that: The manufacturing method comprises: forming a first substrate, wherein forming the first substrate comprises forming a plurality of light sources on a first substrate; Forming a second substrate, the forming of the second substrate comprising: forming a light conversion structure on a second substrate, the light conversion structure comprising at least a plurality of quantum dot structures; forming a plurality of extinction structures on a side of the light conversion structure away from the second substrate by a patterning process, wherein a first channel is formed between any two adjacent extinction structures; and forming a plurality of first optical structures on a side of the light conversion structure away from the second substrate and in the plurality of first channels by a printing process; aligning the first substrate and the second substrate; and filling a filling material portion between the first substrate and the second substrate, The refractive index of the material of the filling material part is greater than the refractive index of the material of the first optical structure, and the extinction structure comprises a light absorbing material; and The orthographic projections of the multiple light sources on the first substrate at least partially overlap with the orthographic projections of the multiple first optical structures on the first substrate, the orthographic projections of the light conversion structure on the first substrate at least partially overlap with the orthographic projections of the multiple first optical structures on the first substrate, and the orthographic projections of the multiple first optical structures on the first substrate fall within the orthographic projections of the filling material portion on the first substrate.

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