Display panel, electronic device, and method for manufacturing a display panel

Abstract

Embodiments of the present disclosure provide a display panel, comprising: a substrate; a first electrode layer disposed on the substrate; a light-emitting material layer for emitting excitation light, the light-emitting material layer being located on a side of the first electrode layer away from the substrate; a second electrode layer, the second electrode layer being located on a side of the light-emitting material layer away from the substrate; and at least one light wavelength conversion layer, the light wavelength conversion layer being located on a side of the second electrode layer away from the substrate and configured to convert the excitation light emitted from the light-emitting material layer into light of a predetermined color. Wherein, the display panel further comprises an elastic lens layer, the elastic lens layer being located on a side of the second electrode layer away from the substrate and on a side of the light wavelength conversion layer facing the substrate, and the elastic lens layer is configured to converge the excitation light emitted from the light-emitting material layer. Embodiments of the present disclosure also provide an electronic device and a manufacturing method of the display panel.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and particularly to a display panel, an electronic device including the display panel, and a method for manufacturing a display panel. Background Art

[0002] Quantum dot display technology is one of the hotspots in display technologies. In the solution for large-size display devices, a quantum dot-organic light-emitting diode (QD-OLED) display panel combines quantum dot display technology and organic light-emitting diode display technology, and uses an organic light-emitting diode to excite quantum dots to emit light for display. The quantum dot-organic light-emitting diode display panel has potential technical advantages. For example, it has high resolution, high color gamut, and high color purity, and does not have viewing angle dependence. Summary of the Invention

[0003] Embodiments of the present disclosure provide a display panel, including:

[0004] A substrate;

[0005] A first electrode layer disposed on the substrate;

[0006] A light-emitting material layer for emitting excitation light, the light-emitting material layer being located on a side of the first electrode layer away from the substrate;

[0007] A second electrode layer, the second electrode layer being located on a side of the light-emitting material layer away from the substrate; and

[0008] At least one light wavelength conversion layer, the light wavelength conversion layer being located on a side of the second electrode layer away from the substrate, for converting the excitation light emitted from the light-emitting material layer into light of a predetermined color,

[0009] Wherein, the display panel further includes an elastic lens layer, the elastic lens layer being located on a side of the second electrode layer away from the substrate and on a side of the light wavelength conversion layer facing the substrate, and the elastic lens layer is configured to converge the excitation light emitted from the light-emitting material layer.

[0010] In some embodiments, the elastic lens layer has an elastic restoring force of 200 MPa to 600 MPa.

[0011] In some embodiments, the display panel further includes a thin film encapsulation, the thin film encapsulation being located between the elastic lens layer and the second electrode layer, and wherein, between the thin film encapsulation and the light wavelength conversion layer and around the elastic lens layer, a gas or a flexible medium is filled, and the refractive index of the gas or the flexible medium is lower than the refractive index of the elastic lens layer.

[0012] In some embodiments, the display panel further includes a protective layer located between the elastic lens layer and the light wavelength conversion layer, wherein the height of the elastic lens layer in the direction perpendicular to the substrate is equal to the distance in the direction perpendicular to the substrate from the surface of the protective layer facing the substrate to the surface of the thin film encapsulation facing away from the substrate.

[0013] In some embodiments, the at least one light wavelength conversion layer includes a first color light wavelength conversion layer and a second color light wavelength conversion layer, the elastic lens layer includes a first converging lens and a second converging lens, and the orthographic projection of the first converging lens on the substrate at least partially overlaps with the orthographic projection of the first color light wavelength conversion layer on the substrate, and the orthographic projection of the second converging lens on the substrate at least partially overlaps with the orthographic projection of the second color light wavelength conversion layer on the substrate.

[0014] In some embodiments, the adjacent first color light wavelength conversion layer and the second color light wavelength conversion layer are spaced apart by a spacer in the direction parallel to the substrate.

[0015] In some embodiments, the inner angle formed between the sloping surface of the spacer facing the first color light wavelength conversion layer or the second color light wavelength conversion layer and the surface of the spacer facing the substrate is less than 90 degrees.

[0016] In some embodiments, the area of the orthographic projection of the surface of the spacer facing the substrate on the substrate is greater than the area of the orthographic projection of the surface of the spacer facing away from the substrate on the substrate.

[0017] In some embodiments, the height h of the first converging lens in the direction perpendicular to the substrate satisfies:

[0018]

[0019] wherein, W is the sum of the width of the first color light wavelength conversion layer and the widths of the spacers on the two adjacent sides thereof, and θ1 is the predetermined divergence angle of the excitation light emitted by the light emitting material layer.

[0020] In some embodiments, the excitation light emitted by the light emitting material layer has a third color, the display panel further includes a third color light transmissive layer, the third color light transmissive layer is located on the side of the second electrode layer away from the substrate and is used to transmit the excitation light, and the elastic lens layer further includes a third converging lens, and the orthographic projection of the third converging lens on the substrate at least partially overlaps with the orthographic projection of the third color light transmissive layer on the substrate.

[0021] In some embodiments, the display panel further includes a filter layer located on a side of the at least one light wavelength conversion layer facing away from the substrate, and the filter layer is configured to filter the light emitted from the first color light wavelength conversion layer and the second color light wavelength conversion layer, and the filter layer is a thin film filter.

[0022] In some embodiments, the filter layer includes a long-pass filter film, and a positive projection of the long-pass filter film on the substrate covers a positive projection of the first color light wavelength conversion layer on the substrate and a positive projection of the second color light wavelength conversion layer on the substrate. A passband wavelength range of the long-pass filter film at least partially covers an expected emission light wavelength range of the first color light wavelength conversion layer and an expected emission light wavelength range of the second color light wavelength conversion layer, and a stopband wavelength range of the long-pass filter film covers a wavelength range of the excitation light emitted from the light emitting material layer.

[0023] In some embodiments, the filter layer includes:

[0024] a first color filter film, a positive projection of the first color filter film on the substrate covers a positive projection of the first color light wavelength conversion layer on the substrate, and the first color filter film is configured to filter light of wavelengths other than an expected emission light wavelength range of the first color light wavelength conversion layer; and

[0025] a second color filter film, a positive projection of the second color filter film on the substrate covers a positive projection of the second color light wavelength conversion layer on the substrate, and the second color filter film is configured to filter light of wavelengths other than an expected emission light wavelength range of the second color light wavelength conversion layer.

[0026] In some embodiments, a surface of one or more of the at least one light wavelength conversion layer on a side facing away from the substrate has a shape of a converging lens surface.

[0027] In some embodiments, the display panel further includes a color filter cover plate located on a side of the filter layer facing away from the substrate.

[0028] Embodiments of the present disclosure further provide an electronic device including the display panel according to any one of the foregoing embodiments.

[0029] Embodiments of the present disclosure further provide a method for manufacturing a display panel, including:

[0030] providing a substrate and sequentially forming a first electrode layer, a light emitting material layer, and a second electrode layer on the substrate to form an array substrate;

[0031] Provide a color film cover plate and form at least one light wavelength conversion layer on the color film cover plate; and

[0032] Form an elastic lens layer on a side of the at least one light wavelength conversion layer facing away from the color film cover plate to make a color film substrate,

[0033] wherein, the elastic lens layer is located on a side of the second electrode layer away from the substrate and on a side of the light wavelength conversion layer facing the substrate, and the elastic lens layer is configured to converge the excitation light emitted from the light emitting material layer.

[0034] In some embodiments, before forming the at least one light wavelength conversion layer, the method further includes:

[0035] Form a filter layer on the color film cover plate;

[0036] Form a plurality of spacer portions on a side of the filter layer facing away from the color film cover plate, and an opening area is provided between the spacer portions;

[0037] wherein, the at least one light wavelength conversion layer is formed in the opening area, and adjacent light wavelength conversion layers are spaced apart by the spacer portions.

[0038] In some embodiments, before forming the filter layer, the method further includes:

[0039] Form a black matrix layer on the color film cover plate,

[0040] wherein, the filter layer is located on a side of the black matrix layer away from the color film substrate.

[0041] In some embodiments, the method for manufacturing the display panel further includes:

[0042] Assemble the color film substrate and the array substrate together to form a display panel. Description of the Drawings

[0043] To more clearly illustrate the technical solutions of the embodiments of the present disclosure text, the drawings of the embodiments will be briefly described below. It should be understood that the following described drawings only relate to some embodiments of the present disclosure text and do not limit the present disclosure text, wherein:

[0044] Figure 1 Shows a schematic cross-sectional view of a display panel according to some embodiments of the present disclosure;

[0045] Figure 2 Shows a schematic cross-sectional view of a display panel according to other embodiments of the present disclosure;

[0046] Figure 3 Shows a schematic diagram of a converging lens in the elastic lens layer;

[0047] Figure 4 Schematic diagram of a color filter substrate of a display panel according to some embodiments of the present disclosure;

[0048] Figure 5 Schematic diagram showing the light filtering characteristics of a thin film filter in a display panel according to some embodiments of the present disclosure;

[0049] Figure 6 Schematic diagram showing the light filtering characteristics of another thin film filter in a display panel according to some embodiments of the present disclosure;

[0050] Figure 7 Schematic diagram showing the light filtering characteristics of yet another thin film filter in a display panel according to some embodiments of the present disclosure;

[0051] Figure 8 Schematic diagram showing the light filtering characteristics of another thin film filter in a display panel according to some embodiments of the present disclosure;

[0052] Figure 9 Schematic cross-sectional view of a display panel according to some other embodiments of the present disclosure;

[0053] Figure 10 Schematic plan view of a display panel according to some embodiments of the present disclosure;

[0054] Figure 11 Schematic flow chart schematically showing a method of manufacturing a display panel according to some embodiments of the present disclosure; and

[0055] Figure 12 Schematic flow chart schematically showing a method of manufacturing a display panel according to some other embodiments of the present disclosure. Detailed Description of the Embodiments

[0056] To more clearly elaborate the objectives, technical solutions and advantages of the present disclosure, the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the following description of the embodiments is intended to explain and illustrate the general concept of the present disclosure, and should not be construed as a limitation to the present disclosure. In the specification and the drawings, the same or similar reference numerals refer to the same or similar components or elements. For clarity, the drawings are not necessarily drawn to scale, and some well-known components and structures may be omitted in the drawings.

[0057] Unless otherwise defined, technical terms or scientific terms used in this disclosure shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second" and similar terms used in this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. The word "a" or "an" does not exclude a plurality. Words such as "comprising" or "including" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", "top" or "bottom" and so on are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly. When an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" on or under the other element, or there may be intermediate elements.

[0058] In a color display panel, organic light-emitting elements that output multiple different colors can be used, or organic light-emitting elements that output a single color can be used and a color conversion structure can be provided to obtain output light of multiple colors. In the latter scheme, a double-substrate structure can be adopted, that is, a stacked structure of organic light-emitting elements is fabricated on one glass substrate, and a color conversion structure is fabricated on another glass substrate, and then the two substrates are assembled together, and the space between them is filled with a filler.

[0059] Embodiments of the present disclosure disclose a display panel 100. The display panel 100 may include a display area AA and a peripheral area P. A plurality of sub-pixels may be provided in the display area. Figure 10 Three adjacent sub-pixels are schematically shown, namely a first sub-pixel PX1, a second sub-pixel PX2 and a third sub-pixel PX3. As an example, the first sub-pixel PX1, the second sub-pixel PX2 and the third sub-pixel PX3 may emit light of different colors respectively to achieve color display. For example, the first sub-pixel PX1 may emit red light, the second sub-pixel PX2 may emit green light, and the third sub-pixel PX3 may emit blue light.

[0060] Figure 1 shows the specific film layer structure of the display panel 100 (especially the above three sub-pixels in the display panel 100). Figure 1 can be generally regarded as along Figure 10A cross-sectional view taken along the cut line X-X. The display panel 100 may include: a substrate 30, a first electrode layer 21, a light-emitting material layer 22, a second electrode layer 23, a light wavelength conversion layer 31, and an elastic lens layer 32. The first electrode layer 21 may be disposed on the substrate 30. Here, the first electrode layer 21 being disposed on the substrate 30 does not necessarily mean that the first electrode layer 21 is directly disposed on the substrate 30. For example, an insulating layer 40 may also be provided between the first electrode layer 21 and the substrate 30. The light-emitting material layer 22 is located on the side of the first electrode layer 21 away from the substrate 30, and the second electrode layer 23 is located on the side of the light-emitting material layer 22 away from the substrate 30. The light-emitting material layer 22 is sandwiched between the first electrode layer 21 and the second electrode layer 23 and can emit excitation light under the control of the voltages of the first electrode layer 21 and the second electrode layer 23. Here, the light-emitting material layer 22, the first electrode layer 21, and the second electrode layer 23 constitute an organic light-emitting element. The light wavelength conversion layer 31 is located on the side of the second electrode layer 23 away from the substrate 30 and is used to convert the excitation light emitted from the light-emitting material layer 22 into light of a predetermined color. For example, if the excitation light is blue light, the light wavelength conversion layer 31 can convert it into other colors, such as red or green, thereby achieving color display. The elastic lens layer 32 is located on the side of the second electrode layer 23 away from the substrate 30 and on the side of the light wavelength conversion layer 31 facing the substrate 30. The elastic lens layer 32 is configured to converge the excitation light emitted from the light-emitting material layer.

[0061] The elastic lens layer 32 may be made of a material having an elastic restoring force (such as certain photoresist materials (such as positive photoresist or negative photoresist). In Figure 1 In the embodiment, a double-substrate structure is adopted, that is, an organic light-emitting structure (such as including the first electrode layer 21, the light-emitting material layer 22, and the second electrode layer 23, etc.) may be disposed on the above-mentioned substrate 30, and the light wavelength conversion layer 31 may be disposed on another substrate (which can be called a color filter cover plate 50), and then the two substrates are assembled together to form the display panel 100. In the related art, a relatively thick filler (at least more than 10 microns) is filled between the light wavelength conversion layer 31 and the organic light-emitting structure. This filler can be used to support the color filter cover plate 50 and prevent the color filter cover plate 50 from excessively pressing the organic light-emitting structure and affecting the operation of the organic light-emitting structure. However, due to the large thickness of the filler, the light emitted by the organic light-emitting structure in a certain sub-pixel may enter the light wavelength conversion layer in an adjacent sub-pixel, thus causing a color bleeding problem. And if the thickness of the existing filler is reduced, problems such as uneven thickness are likely to occur, resulting in defects of the display panel such as mura.

[0062] In an embodiment of the present disclosure, the elastic lens layer 32 is disposed between the light wavelength conversion layer 31 and the organic light-emitting structure instead of the filler. On the one hand, it can support the color film cover plate 50, and on the other hand, it can converge the light emitted from the organic light-emitting structure to reduce the mutual interference of light between adjacent sub-pixels. In addition, the thickness of the elastic lens layer 32 can be adjusted according to actual needs, for example, it can be set between 2 micrometers and 9 micrometers. This can reduce the thickness of the display panel compared with the filler in the related art.

[0063] In some embodiments, the display panel 100 may further include a packaging structure, which may be disposed on the side of the second electrode layer 23 away from the substrate 30. The packaging structure may be, for example, a thin film encapsulation (TFE) between the elastic lens layer and the second electrode layer. The thin film encapsulation may include a first inorganic encapsulation layer 25, an organic encapsulation layer 26, and a second inorganic encapsulation layer 27 stacked in sequence. The thin film encapsulation can be used to prevent the functional film layer on the array substrate from being corroded and polluted by the environment. In some embodiments, a gas or a flexible medium 29 is filled between the thin film encapsulation and the light wavelength conversion layer and around the elastic lens layer 32. During use, the elastic lens layer 32 will undergo a certain deformation due to the weight it bears. At this time, the gas (such as air, nitrogen, helium, etc.) or the flexible medium 29 around the elastic lens layer 32 can allow this deformation of the elastic lens layer 32. As an example, the flexible medium 29 can be made of materials such as polyimide, polyamide, polyurethane, etc. that match the elastic properties of the elastic lens layer 32. The flexible medium 29 can also undergo a corresponding deformation when the elastic lens layer 32 deforms. For example, the flexible medium 29 can also provide an elastic restoring force of 200 MPa to 600 MPa. To better realize the optical convergence effect of the elastic lens layer 32, for example, the refractive index of the gas or the flexible medium 29 is less than that of the elastic lens layer 32. Compared with a common non-elastic lens layer, the elastic lens layer 32 can provide a greater supporting force for the film layer structure (such as the color film cover plate, etc.) it bears by means of the elastic restoring force, which helps to reduce the film layer thickness. The flexible medium 29 is located around the elastic lens layer 32. On the one hand, it can assist the elastic lens layer 32 to provide an elastic supporting effect, and on the other hand, it can also facilitate the manufacturing process of the elastic lens layer 32 (specifically, refer to the description of the embodiments shown below Figure 9 ).

[0064] In some embodiments, as Figure 1 and Figure 2As shown, a protective layer 311 may also be provided between the elastic lens layer 32 and the light wavelength conversion layer. The protective layer 311 may be made of, for example, silicon nitride (SiN) and may be deposited over the entire surface. The protective layer 311 may have a thickness of, for example, more than 6000 angstroms. The height h of the elastic lens layer 32 in the direction perpendicular to the substrate 30 is equal to the distance in the direction perpendicular to the substrate 30 from the surface of the protective layer 311 facing the substrate 30 to the surface of the thin film encapsulation facing away from the substrate. That is, the upper and lower sides of the elastic lens layer 32 respectively abut against the surface of the protective layer 311 and the surface of the thin film encapsulation. It should be noted that in some embodiments, the protective layer 311 may not be provided, and the elastic lens layer may be in direct contact with the light wavelength conversion layer.

[0065] In some embodiments, as Figure 1 shown, the light wavelength conversion layer 31 in the display panel 100 may include a first color light wavelength conversion layer 31A and a second color light wavelength conversion layer 31B. Correspondingly, the elastic lens layer 32 may include a first converging lens 32A and a second converging lens 32B. The orthographic projection of the first converging lens 32A on the substrate 30 at least partially overlaps with the orthographic projection of the first color light wavelength conversion layer 31A on the substrate 30, and the orthographic projection of the second converging lens 32B on the substrate 30 at least partially overlaps with the orthographic projection of the second color light wavelength conversion layer 31B on the substrate 30. The first color light wavelength conversion layer 31A and the first converging lens 32A are located in the first sub-pixel PX1, and the second color light wavelength conversion layer 31B and the second converging lens 32B are located in the second sub-pixel PX2. As an example, the orthographic projection of the first converging lens 32A on the substrate 30 may completely cover the orthographic projection of the first color light wavelength conversion layer 31A on the substrate 30, which may enable the first converging lens 32A to better converge the light emitted from the light emitting material layer 22 to the first color light wavelength conversion layer 31A. As Figure 1As shown, the excitation lights La and Lb emitted from the light-emitting material layer 22 can be deflected toward the first color light wavelength conversion layer 31A through the converging effect of the first converging lens 32A. In this case, even the excitation light Lb with a relatively large divergence angle emitted from the light-emitting material layer 22 can be absorbed by the spacer portion 34A due to the converging effect of the first converging lens 32A instead of being incident on the adjacent second color light wavelength conversion layer 31B. That is to say, when the orthographic projection of the first converging lens 32A on the substrate 30 is relatively large (for example, when it completely covers the orthographic projection of the first color light wavelength conversion layer 31A on the substrate 30), the optical interference between adjacent light wavelength conversion layers can be reduced. Similarly, in some embodiments, the orthographic projection of the second converging lens 32B on the substrate 30 can also completely cover the orthographic projection of the second color light wavelength conversion layer 31B on the substrate 30.

[0066] In some embodiments, the adjacent first color light wavelength conversion layer 31A and second color light wavelength conversion layer 31B are spaced apart by a spacer portion 34A in a direction parallel to the substrate 30. The spacer portion 34A can prevent the interference between the lights from different color light wavelength conversion layers and can also improve the contrast of the display panel. In the embodiments of the present disclosure, the spacer portion 34A can have an absorption and / or reflection effect on light.

[0067] As an example, as Figure 1 shown, the cross-section of the spacer portion 34A has a trapezoidal shape. The bottom side of the trapezoid away from the first color light wavelength conversion layer 31A and the second color light wavelength conversion layer 31B ( Figure 1 the lower bottom side in Figure 1 is longer than the bottom side close to the first color light wavelength conversion layer 31A and the second color light wavelength conversion layer 31B ( Figure 1 the upper bottom side in Figure 1The interior angle formed between the lower surface of the spacer portion 34A (the middle one) is less than 90 degrees. When light irradiates the side slope 341, at least a part of the light will be reflected in a direction away from the first converging lens 32A or the second converging lens 32B (see Figure 1 for the light ray Lc), thereby increasing the light output, and problems such as interference caused by the side slope 341 reflecting light towards the light-emitting material layer 22 can be avoided.

[0068] In some embodiments, the area of the surface of the spacer portion 34A facing the substrate 30 in the orthographic projection on the substrate 30 is larger than the area of the surface of the spacer portion 34A facing away from the substrate 30 in the orthographic projection on the substrate 30. This also helps to make more light exit from the first color light wavelength conversion layer 31A or the second color light wavelength conversion layer 31B.

[0069] Here, taking the first converging lens 32A as an example, the height of the lens in the elastic lens layer 32 will be introduced. Figure 3 Schematically shows the positional and dimensional relationship between the first converging lens 32A and the surrounding structures. The greater the height h of the first converging lens 32A in the direction perpendicular to the substrate 30, the greater the distance between the light-emitting material layer 22 and the first color light wavelength conversion layer 31A, which may reduce the light utilization rate. In Figure 3 schematically shows the left and right boundaries of the light-emitting material layer 22 corresponding to the first converging lens 32A. It is assumed that the light emitted from the left and right boundaries of the effective light-emitting region 22A of the light-emitting material layer 22 (it should be understood that only the part of the light-emitting material layer 22 where a voltage is applied can effectively emit light, and generally, the part of the light-emitting material layer 22 within the opening region of the pixel defining layer 28 can be considered as the effective light-emitting region 22A of the light-emitting material layer 22. Figure 3 schematically shows the left and right boundaries of the effective light-emitting region 22A (i.e., the intersections of the black blocks on the left and right sides of the effective light-emitting region 22A with the effective light-emitting region 22A)), then the following relationship can be obtained: the height h of the first converging lens 32A in the direction perpendicular to the substrate 30 satisfies:

[0070]

[0071] wherein, W is the sum of the width of the first color light wavelength conversion layer 31A and the widths of the spacer portions 34A on both sides adjacent to the first color light wavelength conversion layer 31A, as Figure 3As shown. θ1 is a predetermined divergence angle of the excitation light emitted from the effective light-emitting region 22A. It is assumed that in the present application, the divergence angle θ1 is defined as the angle between the envelope of the cross-section of the excitation light beam in the direction perpendicular to the substrate 30 and the direction perpendicular to the substrate 30. When the excitation light beam has such a divergence angle θ1, the excitation light beam just does not irradiate into other light wavelength conversion layers adjacent to the first color light wavelength conversion layer 31A. When the height h of the first converging lens 32A in the direction perpendicular to the substrate 30 does not satisfy the above formula (1) (that is, when the height h is greater than the right side of the inequality in formula (1)), the first converging lens 32A may cause an undesired deflection of the excitation light beam, so that a part of the light irradiates into other light wavelength conversion layers adjacent to the first color light wavelength conversion layer 31A, thereby generating a certain amount of crosstalk.

[0072] On the other hand, if the height h of the first converging lens 32A in the direction perpendicular to the substrate 30 is too small, it may cause the radius of curvature of the first converging lens 32A to be too large. If the radius of curvature of the first converging lens 32A is too large, the first converging lens 32A may overlap with other adjacent converging lenses (such as the second converging lens 32B) (when the sub-pixel size is fixed). Therefore, too large a radius of curvature of the first converging lens 32A may lead to an unnecessary increase in the size of the sub-pixel and a decrease in resolution. In addition, too small a height h of the first converging lens 32A in the direction perpendicular to the substrate 30 is also not conducive to the elastic support of the structure pressed on the elastic lens layer 32 (especially when a heavier substrate or cover plate is provided above the elastic lens layer 32). As an example, the height h of the first converging lens 32A in the direction perpendicular to the substrate 30 can be 2 micrometers to 9 micrometers.

[0073] Although the converging lens structure in the elastic lens layer 32 has been introduced above by taking the first converging lens 32A as an example, it should be understood that other converging lens structures (such as the second converging lens 32B, etc.) in the elastic lens layer 32 can also be similar to it. Specific details will not be elaborated.

[0074] In the embodiments of the present disclosure, it is desirable that the converging lens structure in the elastic lens layer 32 has a relatively large refractive index so as to converge the excitation light emitted from the light-emitting material layer 22. As an example, the converging lens structure in the elastic lens layer 32 can have an elastic restoring force of 200 MPa to 600 MPa, such as an elastic restoring force of about 400 MPa. For example, the converging lens structure in the elastic lens layer 32 can be made of a photosensitive resist material (such as some positive resists or negative resists), and can also be made of materials such as polyimide, polyamide, polyurethane, resin, etc.

[0075] In some embodiments, such as Figure 2As shown, the display panel 100' may further include a black matrix layer BM, and the black matrix layer BM is located on a side of the spacer 34A away from the substrate 30. A positive projection of the black matrix layer BM on the substrate 30 at least partially overlaps a positive projection of the spacer 34A on the substrate 30. On the one hand, the black matrix layer BM can be used to separate adjacent sub-pixels; on the other hand, it can be used as an alignment reference during the fabrication of the film layer structure of the display panel. For example, when the display panel adopts a double-substrate structure, the above-mentioned spacer 34A, the light wavelength conversion layer, and the elastic lens layer 32 are all disposed on the color filter substrate 50, and the black matrix layer BM can be formed on the color filter substrate 50 first before forming these structures, so that the black matrix layer BM can be used as an alignment reference when forming structures such as the spacer 34A, the light wavelength conversion layer, and the elastic lens layer 32.

[0076] In some embodiments, the excitation light emitted from the light-emitting material layer 22 may have a third color. The first-color light wavelength conversion layer 31A can convert the excitation light of the third color into light of the first color, and the second-color light wavelength conversion layer 31B can convert the excitation light of the third color into light of the second color. For example, the light-emitting material layer 22 may emit blue light, the light of the first color is red light, and the light of the second color is green light. For a display panel having sub-pixels of three colors (such as red, green, and blue), since the light of the third color can itself be used for display, it is only necessary to emit the light of the third color, and there is no need to convert it into other colors. Figure 1 In the example shown, the display panel may further include a third-color light-transmitting layer 31C, and the third-color light-transmitting layer 31C is located on a side of the second electrode layer 23 away from the substrate 30 and is used to transmit the excitation light. Correspondingly, the elastic lens layer 32 may further include a third converging lens 32C. A positive projection of the third converging lens 32C on the substrate 30 at least partially overlaps a positive projection of the third-color light-transmitting layer 31C on the substrate 30. The third converging lens 32C can be used to converge and guide the excitation light of the third color emitted from the light-emitting material layer 22 to the third-color light-transmitting layer 31C. As an example, a positive projection of the third converging lens 32C on the substrate 30 may completely cover a positive projection of the third-color light-transmitting layer 31C on the substrate 30, so that as much excitation light of the third color as possible is converged and guided into the third-color light-transmitting layer 31C by the third converging lens 32C. The third-color light-transmitting layer 31C may be arranged side by side with the first-color light wavelength conversion layer 31A and the second-color light wavelength conversion layer 31B. Adjacent ones of the first-color light wavelength conversion layer 31A, the second-color light wavelength conversion layer 31B, and the third-color light-transmitting layer 31C may be separated by spacers 34A, 34B.

[0077] In some embodiments, at least one of the first color light wavelength conversion layer 31A, the second color light wavelength conversion layer 31B, and the third color light transmissive layer 31C includes scattering particles for scattering incident excitation light. For example, such scattering particles may be included in all of the first color light wavelength conversion layer 31A, the second color light wavelength conversion layer 31B, and the third color light transmissive layer 31C. Such scattering particles can make the intensity distribution of the light emitted from the first color light wavelength conversion layer 31A, the second color light wavelength conversion layer 31B, and the third color light transmissive layer 31C more uniform. In particular, when the third color light transmissive layer 31C does not include these scattering particles, the light intensity of the emitted light may be relatively concentrated in a certain area (for example, within a viewing angle of plus or minus 30 degrees), and beyond this area, the light intensity of the emitted light will decrease significantly. This may result in different intensities of the displayed image viewed by observers in different areas. When the third color light transmissive layer 31C includes such scattering particles, the light intensity of the emitted light may be relatively uniform over a larger range (for example, within a viewing angle of plus or minus 60 degrees or plus or minus 80 degrees). In addition, the scattering particles provided in the first color light wavelength conversion layer 31A and the second color light wavelength conversion layer 31B can also increase the efficiency of light wavelength conversion by scattering (for example, enhancing the interaction between incident light and quantum dots when the first color light wavelength conversion layer 31A is a quantum dot layer). As an example, the size of the scattering particles can be in the range of 100 nm to 600 nm. For example, the scattering particles can be made of materials such as titanium dioxide.

[0078] In some embodiments, the display panel may further include a filter layer 35, and the filter layer 35 is located on a side of the at least one light wavelength conversion layer 31 facing away from the substrate 30. The filter layer 35 is used to filter the light emitted from the first color light wavelength conversion layer 31A and the second color light wavelength conversion layer 31B. The filter layer 35 can be used to filter out the excitation light emitted from the light emitting material layer 22 to avoid interference with the light emitted from the first color light wavelength conversion layer 31A and the second color light wavelength conversion layer 31B. In some embodiments, the filter layer may include a filter film formed by multiple layers of optical interference films (or thin film filters).

[0079] Figure 5 , Figure 6 , Figure 7 and Figure 8 respectively show the relationship between the transmittance and wavelength of four different filter films. Figure 5Disclosed is a filter film that can be used to filter the light emitted from the second color light wavelength conversion layer 31B. This filter film can transmit green light (passband wavelength range of approximately 510 nm to 590 nm) and filter out light of other wavelengths. For example, this filter film can be composed of multiple alternating film layers of titanium dioxide (TiO2) and silicon dioxide (SiO2). Table 1 gives an example.

[0080] Film layer sequence Material Thickness (nm) 1 <![CDATA[TiO2]]> 32.50 2 <![CDATA[SiO2]]> 15.83 3 <![CDATA[TiO2]]> 41.31 4 <![CDATA[SiO2]]> 88.44 5 <![CDATA[TiO2]]> 72.08 6 <![CDATA[SiO2]]> 93.25 7 <![CDATA[TiO2]]> 18.50 8 <![CDATA[SiO2]]> 28.51 9 <![CDATA[TiO2]]> 45.14 10 <![CDATA[SiO2]]> 91.78 11 <![CDATA[TiO2]]> 41.89 12 <![CDATA[SiO2]]> 90.67 13 <![CDATA[TiO2]]> 32.47 14 <![CDATA[SiO2]]> 16.32 15 <![CDATA[TiO2]]> 45.16 16 <![CDATA[SiO2]]> 96.04 17 <![CDATA[TiO2]]> 54.37 18 <![CDATA[SiO2]]> 91.69 19 <![CDATA[TiO2]]> 28.86 20 <![CDATA[SiO2]]> 17.87 21 <![CDATA[TiO2]]> 45.91

[0081] Table 1

[0082] In the example given in Table 1, this filter film is composed of 11 alternating layers of titanium dioxide and 10 layers of silicon dioxide. Among them, the total thickness of each titanium dioxide layer is 458.19 nm, and the total thickness of each silicon dioxide layer is 630.40 nm. Incident light will generate transmission and reflection between each adjacent titanium dioxide layer and silicon dioxide layer, and the multiple transmitted light and reflected light formed will interfere to form the desired spatial light intensity distribution.

[0083] Figure 6 Disclosed is a filter film that can be used to filter the light emitted from the first color light wavelength conversion layer 31A. This filter film can transmit red light (passband wavelength range of approximately 620 nm to 670 nm) and filter out light of other wavelengths. For example, this filter film can also be composed of multiple alternating film layers of titanium dioxide (TiO2) and silicon dioxide (SiO2). Table 2 gives an example.

[0084] Film layer sequence Material Thickness (nm) 1 <![CDATA[TiO2]]> 43.44 2 <![CDATA[SiO2]]> 65.99 3 <![CDATA[TiO2]]> 5.10 4 <![CDATA[SiO2]]> 75.08 5 <![CDATA[TiO2]]> 39.78 6 <![CDATA[SiO2]]> 62.69 7 <![CDATA[TiO2]]> 23.50 8 <![CDATA[SiO2]]> 65.59 9 <![CDATA[TiO2]]> 85.76 10 <![CDATA[SiO2]]> 83.59 11 <![CDATA[TiO2]]> 48.84 12 <![CDATA[SiO2]]> 87.70 13 <![CDATA[TiO2]]> 40.29 14 <![CDATA[SiO2]]> 81.93 15 <![CDATA[TiO2]]> 61.48 16 <![CDATA[SiO2]]> 48.26 17 <![CDATA[TiO2]]> 30.62 18 <![CDATA[SiO2]]> 83.81 19 <![CDATA[TiO2]]> 60.80

[0085] Table 2

[0086] In the example given in Table 2, this filter film is composed of 10 alternating layers of titanium dioxide and 9 layers of silicon dioxide. Among them, the total thickness of each titanium dioxide layer is 439.59 nm, and the total thickness of each silicon dioxide layer is 654.65 nm. Incident light will also generate transmission and reflection between each adjacent titanium dioxide layer and silicon dioxide layer, and the multiple transmitted light and reflected light formed will interfere to form the desired spatial light intensity distribution. This spatial light intensity distribution depends on the arrangement of each film layer and the thickness of each layer. Since the arrangement quantity and thickness of each film layer in the example given in Table 2 are different from those in the example shown in Table 1, their filtering effects are also different.

[0087] Figure 7 Disclosed is a filter film that can be used to filter the light emitted from the third color light transmissive layer 31C. This filter film is a short-pass filter film that can transmit blue light (passband wavelength range of less than approximately 480 nm) and filter out light of other wavelengths. For example, this filter film can also be composed of multiple alternating film layers of titanium dioxide (TiO2) and silicon dioxide (SiO2). Table 3 gives an example.

[0088] Film layer sequence Material Thickness (nm) 1 <![CDATA[TiO2]]> 57.79 2 <![CDATA[SiO2]]> 100.22 3 <![CDATA[TiO2]]> 53.15 4 <![CDATA[SiO2]]> 123.26 5 <![CDATA[TiO2]]> 16.96 6 <![CDATA[SiO2]]> 22.51 7 <![CDATA[TiO2]]> 69.99 8 <![CDATA[SiO2]]> 104.25 9 <![CDATA[TiO2]]> 49.18 10 <![CDATA[SiO2]]> 102.70 11 <![CDATA[TiO2]]> 47.36 12 <![CDATA[SiO2]]> 102.30 13 <![CDATA[TiO2]]> 49.48 14 <![CDATA[SiO2]]> 100.43 15 <![CDATA[TiO2]]> 50.76 16 <![CDATA[SiO2]]> 19.17 17 <![CDATA[TiO2]]> 3.55

[0089] Table 3

[0090] In the example given in Table 3, the filter film is composed of 9 alternating layers of titanium dioxide and 8 layers of silicon dioxide. Among them, the total thickness of each titanium dioxide layer is 398.22 nm, and the total thickness of each silicon dioxide layer is 674.84 nm. The incident light will also produce transmission and reflection between each adjacent titanium dioxide layer and silicon dioxide layer, and the multiple transmitted light and reflected light formed will interfere to form the desired spatial light intensity distribution. This spatial light intensity distribution depends on the arrangement of each film layer and the thickness of each layer. Since the arrangement number and thickness of each film layer in the example given in Table 3 are different from those in the examples shown in Table 1 and Table 2, its filtering effect is also different.

[0091] Figure 8 A filter film is shown that can be used to filter the light emitted from the first color light wavelength conversion layer 31A and the second color light wavelength conversion layer 31B. This filter film is a long-pass filter film, which can transmit red light and a considerable part of green light (the passband wavelength range is about greater than 560 nm) and filter out light of other wavelengths. This filter film can also be composed of alternating film layers of multiple titanium dioxides (TiO2) and silicon dioxides (SiO2) for example. Table 4 gives an example.

[0092] Film layer sequence Material Thickness (nm) 1 <![CDATA[SiO2]]> 70.85 2 <![CDATA[TiO2]]> 32.14 3 <![CDATA[SiO2]]> 56.69 4 <![CDATA[TiO2]]> 44.00 5 <![CDATA[SiO2]]> 64.10 6 <![CDATA[TiO2]]> 39.47 7 <![CDATA[SiO2]]> 67.71 8 <![CDATA[TiO2]]> 42.31 9 <![CDATA[SiO2]]> 64.54 10 <![CDATA[TiO2]]> 41.77 11 <![CDATA[SiO2]]> 68.82 12 <![CDATA[TiO2]]> 40.83 13 <![CDATA[SiO2]]> 64.19 14 <![CDATA[TiO2]]> 43.35 15 <![CDATA[SiO2]]> 68.92 16 <![CDATA[TiO2]]> 37.93 17 <![CDATA[SiO2]]> 63.14 18 <![CDATA[TiO2]]> 46.80 19 <![CDATA[SiO2]]> 68.53 20 <![CDATA[TiO2]]> 21.98

[0093] Table 4

[0094] In the example given in Table 4, the filter film is composed of 10 alternating layers of titanium dioxide and 10 layers of silicon dioxide. Among them, the total thickness of each titanium dioxide layer is 390.58 nm, and the total thickness of each silicon dioxide layer is 657.49 nm. The incident light will also produce transmission and reflection between each adjacent titanium dioxide layer and silicon dioxide layer, and the multiple transmitted light and reflected light formed will interfere to form the desired spatial light intensity distribution. This spatial light intensity distribution depends on the arrangement of each film layer and the thickness of each layer. Since the arrangement number and thickness of each film layer in the example given in Table 4 are different from those in the examples shown in Table 1, Table 2 and Table 3, its filtering effect is also different.

[0095] Some examples of filter layers are given above. In the above examples, the filter layer is composed of multiple optical interference thin films. From Figures 5 to 8It can be seen that the filter layer has a good signal-to-noise ratio, and the attenuation of the stop band relative to the pass band is very significant. In existing display panels, the filter layer is usually made of a photosensitive resist, and the absorption differences of the photosensitive resist for light of different wavelengths are utilized to achieve filtering. In some embodiments of the present application, the filter layer composed of multiple layers of optical interference films utilizes the interference and reflection effects of the optical interference films on light of different wavelengths (for example, light that is not expected to pass through the filter film can be reflected back) to achieve filtering. Compared with the filter layer made of a photosensitive resist, the filtering effect is better. The specific implementation manner of the filter film is not limited to the above embodiments. In practice, parameters such as the materials, number of layers, and thicknesses of the respective optical interference films can be set as needed to achieve the desired filtering effect. Of course, in other embodiments of the present disclosure, other structures other than the above-mentioned multiple layers of optical interference films can also be used to make the filter film.

[0096] In some embodiments, the filter layer includes a long-pass filter film 35D (for example, the filtering characteristics of the long-pass filter film are as Figure 8 shown). Such a long-pass filter film can be used to filter the light emitted from the first color light wavelength conversion layer 31A and the second color light wavelength conversion layer 31B. As an example, as Figure 1 shown, the orthographic projection of the long-pass filter film on the substrate 30 can cover the orthographic projection of the first color light wavelength conversion layer 31A on the substrate 30 and the orthographic projection of the second color light wavelength conversion layer 31B on the substrate 30. The passband wavelength range of the long-pass filter film can cover the desired emission light wavelength range of the first color light wavelength conversion layer 31A and the desired emission light wavelength range of the second color light wavelength conversion layer 31B, and the stopband wavelength range of the long-pass filter film covers the wavelength range of the excitation light emitted from the light-emitting material layer 22. It should be noted that in the embodiments of the present disclosure, it is not necessary for the passband wavelength range of the long-pass filter film to completely cover the desired emission light wavelength range of the first color light wavelength conversion layer 31A and the desired emission light wavelength range of the second color light wavelength conversion layer 31B. It only needs the passband wavelength range of the long-pass filter film to at least partially cover the desired emission light wavelength range of the first color light wavelength conversion layer 31A and at least partially cover the desired emission light wavelength range of the second color light wavelength conversion layer 31B. This way can avoid separately setting different filter layers for the first color light wavelength conversion layer 31A and the second color light wavelength conversion layer 31B, simplifying the manufacturing process.

[0097] In some embodiments, the filter layer may include a first color filter film 35A and a second color filter film 35B (see Figure 2)。The positive projection of the first color filter film 35A on the substrate 30 covers the positive projection of the first color light wavelength conversion layer 31A on the substrate 30. The first color filter film 35A is configured to filter out light of wavelengths other than the desired emission wavelength range of the first color light wavelength conversion layer 35A. For example, when the output light of the first color light wavelength conversion layer 31A is red light, the first color filter film 35A can be a red-pass film, such as having the characteristics as shown in Figure 6 . The positive projection of the second color filter film 35B on the substrate 30 covers the positive projection of the second color light wavelength conversion layer 31B on the substrate 30. The second color filter film 35B is configured to filter out light of wavelengths other than the desired emission wavelength range of the second color light wavelength conversion layer 31B. For example, when the output light of the second color light wavelength conversion layer 31B is green light, the second color filter film 35B can be a green-pass film, such as having the characteristics as shown in Figure 5 .

[0098] In the above embodiments, at least one of the long-pass filter film, the first color filter film, and the second color filter film can have a high reflectivity characteristic for blue light. This is beneficial to reflect the blue light back to the first color light wavelength conversion layer 31A and the second color light wavelength conversion layer 31B, thereby improving the utilization efficiency of the blue light.

[0099] In some embodiments, the display panel may further include a third color filter film 35C. The third color filter film 35C is located on the side of the third color light-transmitting layer 31C away from the substrate 30. The positive projection of the third color filter film 35C on the substrate 30 covers the positive projection of the third color light-transmitting layer 31C on the substrate 30. The third color filter film 35C is used to filter out light of wavelengths other than the desired wavelength range of the excitation light emitted by the light-emitting material layer 22. For example, when the excitation light emitted by the light-emitting material layer 22 is blue light, the third color filter film 35C can be a blue-pass film, such as having the characteristics as shown in Figure 7 .

[0100] In the above embodiments, the display panel includes a double-substrate structure, that is, a substrate 30 and a color filter cover plate 50 are disposed opposite to each other. As an example, the color filter cover plate 50 is located on the side of the filter layer 35 away from the substrate 30. However, the embodiments of the present disclosure are not limited thereto. For example, the display panel may not include the color filter cover plate 50 and only have the substrate 30, which is a single-substrate structure. Figure 9Such an embodiment is given in [reference]. In this embodiment, in the display panel 100", only a protective layer 36 is provided on the side of the light filtering layer 35 (such as the first color filter film 35A, the second color filter film 35B, and the third color filter film 35C) facing away from the substrate 30, and there is no cover plate made of, for example, glass or plastic. The manufacturing processes of display panels with a double-substrate structure and those with a single-substrate structure are different. For a display panel with a double-substrate structure, usually, a structure formed by a first electrode layer 21, a light-emitting material layer 22, a second electrode layer 23, etc. (such as may also include a thin-film encapsulation TFE) is formed on the substrate 30, while a structure such as a light wavelength conversion layer 31 and an elastic lens layer 32 (such as may also include a spacer 34A and a light filtering layer 35) is formed on the color filter cover plate 50. Then, the substrate 30 and the color filter substrate 50 on which these structures are formed are aligned and assembled together. For a display panel with a single-substrate structure, after forming structures such as a first electrode layer 21, a light-emitting material layer 22, and a second electrode layer 23 on the substrate 30, structures such as an elastic lens layer 32 and a light wavelength conversion layer 31 can be continuously formed on the substrate 30. In Figure 9 the embodiment of, on the surface of the thin-film encapsulation facing away from the substrate 30 ( Figure 9 which is the upper surface in [reference]) and the surface of the light wavelength conversion layer facing the substrate 30 ( Figure 9 which is the lower surface in [reference]), a flexible medium 29 is filled around the elastic lens layer 32. The flexible medium 29 can generate corresponding deformation when the elastic lens layer 32 undergoes elastic deformation to coordinate with the elastic lens layer 32. In this case, the flexible medium 29 can not only assist in supporting the elastic lens layer 32 but also facilitate the fabrication of the elastic lens layer 32. For example, after forming a thin-film encapsulation (such as including a first inorganic encapsulation layer 25, an organic encapsulation layer 26, and a second inorganic encapsulation layer 27) on the substrate 30, a layer of flexible medium 29 can be first formed on the surface of the thin-film encapsulation, and an accommodation opening can be formed in the flexible medium 29, and then the elastic lens layer 32 can be formed in the accommodation opening. As an example, the thickness of the flexible medium 29 in the direction perpendicular to the substrate 30 can be approximately equal to the height of the elastic lens layer 32 in the direction perpendicular to the substrate 30.

[0101] In some embodiments, the surface of one or more light wavelength conversion layers in at least one light wavelength conversion layer 31 in the display panel facing away from the substrate 30 has the shape of a converging lens surface. This is usually because one or more light wavelength conversion layers 31 (partially or entirely) are formed by using a printing technique instead of evaporation. This is beneficial for simplifying the process, especially for large-sized display panels (such as those on televisions or computer monitors, etc.). In Figure 9In the embodiments, the surfaces of the first color light wavelength conversion layer 31A', the second color light wavelength conversion layer 31B', and the third color light transmissive layer 31C facing away from the substrate 30 all have the shape of a converging lens surface. This is beneficial to increasing the outgoing light intensity of the first color light wavelength conversion layer 31A', the second color light wavelength conversion layer 31B', and the third color light transmissive layer 31C. However, this is not necessary. For example, in the display panel, only a part of the surfaces of the first color light wavelength conversion layer 31A', the second color light wavelength conversion layer 31B', and the third color light transmissive layer 31C facing away from the substrate 30 have the shape of a converging lens surface.

[0102] It should be noted that in Figure 1 、 Figure 2 and Figure 9 In the above embodiments shown, the first converging lens 32A, the second converging lens 32B, and the third converging lens 32C in the elastic lens layer 32 are arranged to have a convex surface facing the substrate 30 and a flat surface facing away from the substrate 30. However, this is only illustrative, and the embodiments of the present disclosure are not limited thereto. For example, when process conditions permit, the first converging lens 32A, the second converging lens 32B, and the third converging lens 32C in the elastic lens layer 32 can also be arranged to have a flat surface facing the substrate 30 and a convex surface facing away from the substrate 30. For a double-substrate structure, it is more advantageous to arrange the convex surface of the converging lens facing the substrate 30 and the flat surface facing away from the substrate 30 as shown in Figure 1 and Figure 2 In the process of manufacturing a display panel with a double-substrate structure, generally, the elastic lens layer 32 is formed on the color filter substrate. Therefore, arranging the flat surface of the converging lens facing away from the substrate 30 (i.e., facing the color filter substrate) can make the flat surface of the converging lens fit on other structures of the color filter substrate (such as the protective layer 311), which is easy to form the shape of the converging lens and easy to reduce the thickness occupied by the gas or the flexible medium 29 perpendicular to the substrate. If the convex surface of the converging lens faces the color filter substrate, that is, the convex surface of the converging lens is formed on other structures of the color filter substrate (such as the protective layer 311), it will cause difficulties in the manufacturing process, making it more difficult to form the shape of the converging lens (especially for the structure where the elastic lens layer 32 is filled with gas around), and it is also not conducive to reducing the total thickness of the display panel.

[0103] In some embodiments, as Figure 1As shown, an insulating layer 40 and driving circuit structures such as thin-film transistors 44 may also be provided between the substrate 30 and the first electrode layer 21. A pixel defining layer 28 may also be provided between the light-emitting material layer 22 and the insulating layer 40. The pixel defining layer 28 is provided with an opening area for defining the setting position of the light-emitting material layer 22. Since the content of the present disclosure mainly relates to the content associated with the elastic lens layer 32 and the light wavelength conversion layer, the encapsulation structure, the insulating layer 40, the pixel defining layer 28, and the driving circuit structure are not shown and discussed in detail.

[0104] The manufacturing method of the display panel described in the embodiments of the present disclosure will be introduced below.

[0105] As Figure 11 shown, an embodiment of the present disclosure also provides a manufacturing method of a display panel, including:

[0106] Step S11: Providing a substrate and sequentially forming a first electrode layer, a light-emitting material layer, and a second electrode layer on the substrate to form an array substrate;

[0107] Step S12: Providing a color filter cover plate and forming at least one light wavelength conversion layer on the color filter cover plate; and

[0108] Step S13: Forming an elastic lens layer on a side of the at least one light wavelength conversion layer facing away from the color filter cover plate to make a color filter substrate.

[0109] As described above, the elastic lens layer 32 is used to converge the excitation light emitted from the light-emitting material layer 22.

[0110] In some embodiments, before the above step S13, the above method may further include:

[0111] Step S14: Forming a filter layer on the color filter cover plate; and

[0112] Step S15: Forming a plurality of spacers on a side of the filter layer facing away from the color filter cover plate, and an opening area is provided between the spacers.

[0113] In this embodiment, the at least one light wavelength conversion layer is formed in the opening area, and adjacent light wavelength conversion layers are spaced apart by the spacers.

[0114] In the above step S14, the filter layer can be formed by depositing multiple optical interference film layers and patterning them by means such as lithography, or by using a high-precision metal mask plate for evaporation coating. The optical interference film layers can, for example, form a film system structure by alternately arranging high and low refractive index materials such as SIO2 / TiO2. In the above method, the spacer can be made of a light-blocking material (absorbing or reflecting material), which can not only prevent color crosstalk between adjacent pixels, but also increase the thickness of the light wavelength conversion layer. When the at least one light wavelength conversion layer includes a first-color light wavelength conversion layer 31A and a second-color light wavelength conversion layer 31B, the first-color light wavelength conversion layer 31A and the second-color light wavelength conversion layer 31B can be formed in two sub-steps respectively. When a third-color light-transmitting layer 31C is provided in the display panel, the third-color light-transmitting layer 31C can be formed of, for example, a transparent protective adhesive, and the transparent protective adhesive can be used for planarization processing. For a substrate with a large step height, an imprinting method can be used to improve the planarization effect, and the specific implementation method is not limited.

[0115] In some embodiments, before forming the filter layer, the method further includes:

[0116] Step S16: Form a black matrix layer on the color filter cover plate, where the filter layer is located on a side of the black matrix layer away from the color filter substrate. As described above, the black matrix layer BM can be used as an alignment reference for forming structures such as the spacer 34A, the light wavelength conversion layer, and the elastic lens layer 32.

[0117] In some embodiments, the method may further include:

[0118] Step S17: Assemble the color filter substrate and the array substrate together to form a display panel. This step S17 can be achieved, for example, by bonding or the like.

[0119] More specifically, the above step S11 may further include forming various film layer structures on the substrate. For example, forming a thin-film transistor structure and thin-film encapsulation on the substrate.

[0120] In Figure 11 The optional steps are indicated by dashed boxes.

[0121] As described above, the display panel according to the embodiments of the present disclosure can have a double-substrate structure or a single-substrate structure. For a display panel with a double-substrate structure (i.e., a display panel provided with a substrate and a color filter substrate at the same time), for example, the manufacturing method as shown in Figure 11 can be used for manufacturing. In this case, the light wavelength conversion layer can be formed by evaporation coating. Figure 4 An example of the structure of the color filter substrate is given.

[0122] As Figure 12As shown, embodiments of the present disclosure also provide another method for manufacturing a display panel, including:

[0123] Step S21: sequentially form a first electrode layer, a light-emitting material layer, a second electrode layer, and a thin-film encapsulation on a substrate;

[0124] Step S22: form an elastic lens layer on a side of the thin-film encapsulation facing away from the substrate;

[0125] Step S23: form a plurality of spacer portions on a side of the elastic lens layer facing away from the substrate;

[0126] Step S24: form at least one light wavelength conversion layer in an opening region between the spacer portions;

[0127] Step S25: form a filter layer on a side of the at least one light wavelength conversion layer facing away from the substrate.

[0128] In the above method, the light wavelength conversion layer can be fabricated by inkjet printing, which is more beneficial for the fabrication of large-sized display panels. The setting of the spacer portions is conducive to forming a cavity for accommodating the printed material fluid, which helps to realize the fabrication of the light wavelength conversion layer by inkjet printing.

[0129] In some embodiments, as described above, after forming a thin-film encapsulation (such as including a first inorganic encapsulation layer 25, an organic encapsulation layer 26, and a second inorganic encapsulation layer 27) on the substrate 30, a layer of flexible medium 29 can be first formed on a side of the thin-film encapsulation facing away from the substrate, and an accommodation opening can be formed in the flexible medium 29, and then the elastic lens layer 32 can be formed in the accommodation opening.

[0130] In some embodiments, the surface of one or more light wavelength conversion layers in the at least one light wavelength conversion layer facing away from the substrate is formed in the shape of a converging lens surface. This shape can be formed by the surface shape of the material fluid during the inkjet printing process. This shape is conducive to improving the light intensity emitted from the light wavelength conversion layer.

[0131] In embodiments of the present disclosure, after step S25, a protective layer can also be formed on a side of the filter layer facing away from the substrate. The display panel fabricated by the method shown above can, for example, have a single-substrate structure. Figure 12 The display panel fabricated by the method shown above can, for example, have a single-substrate structure.

[0132] In embodiments of the present disclosure, the light wavelength conversion layer can, for example, include quantum dots, quantum rods, or phosphors, etc. As an example, quantum dots (with a size ranging from 2 nanometers to 30 nanometers, usually spherical) and particle scatterers much larger than the size of the quantum dots can be provided in the light wavelength conversion layer to enhance the light conversion efficiency and uniformity of the quantum dots.

[0133] In an embodiment of the present disclosure, the elastic lens layer 32 can be fabricated by patterning. For example, the elastic lens layer 32 can be formed from a photoresist material through photolithography.

[0134] In some embodiments, the spacer portions 34A, 34B can be, for example, black, gray, or white. The spacer portions 34A, 34B can be used to reflect or absorb the excitation light, reducing the optical interference between adjacent sub-pixels. For example, the spacer portions 34A, 34B can be made of a photosensitive resist material, and in order to enhance the effect, components such as silicon dioxide or titanium dioxide can be mixed therein to enhance performance parameters such as color and reflectivity.

[0135] Embodiments of the present disclosure further provide an electronic device, including the transparent display panels 100, 100', 100" described in any of the foregoing embodiments. The electronic device can be, for example, any type of display device, 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, an in-vehicle display, an e-book, etc.

[0136] Although the present disclosure has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplarily illustrate the embodiments of the present disclosure and should not be construed as a limitation on the present disclosure. The dimensional ratios in the drawings are merely illustrative and should not be construed as a limitation on the present disclosure.

[0137] The above embodiments merely exemplarily illustrate the principles and structures of the present disclosure and are not used to limit the present disclosure. Those skilled in the art should understand that any changes and improvements made to the present disclosure without departing from the overall concept of the present disclosure are within the scope of the present disclosure. The protection scope of the present disclosure shall be subject to the scope defined by the claims of this application.

Claims

1. A display panel, comprising: A substrate; A first electrode layer disposed on the substrate; A light-emitting material layer for emitting excitation light, the light-emitting material layer being located on a side of the first electrode layer away from the substrate; A second electrode layer, the second electrode layer being located on a side of the light-emitting material layer away from the substrate; And At least one light wavelength conversion layer, the light wavelength conversion layer being located on a side of the second electrode layer away from the substrate and configured to convert the excitation light emitted from the light-emitting material layer into light of a predetermined color, Wherein, the display panel further includes an elastic lens layer, the elastic lens layer being located on a side of the second electrode layer away from the substrate and on a side of the light wavelength conversion layer facing the substrate, and the elastic lens layer is configured to converge the excitation light emitted from the light-emitting material layer; The display panel further includes a thin film encapsulation, the thin film encapsulation being located between the elastic lens layer and the second electrode layer; The display panel further includes a protective layer located between the elastic lens layer and the light wavelength conversion layer, wherein the height of the elastic lens layer in a direction perpendicular to the substrate is equal to the distance in the direction perpendicular to the substrate from the surface of the protective layer facing the substrate to the surface of the thin film encapsulation facing away from the substrate; The at least one light wavelength conversion layer includes a first color light wavelength conversion layer and a second color light wavelength conversion layer, the elastic lens layer includes a first converging lens and a second converging lens, and the orthographic projection of the first converging lens on the substrate completely covers the orthographic projection of the first color light wavelength conversion layer on the substrate, and the orthographic projection of the second converging lens on the substrate completely covers the orthographic projection of the second color light wavelength conversion layer on the substrate.

2. The display panel according to claim 1, wherein The elastic lens layer has an elastic restoring force of 200 MPa to 600 MPa.

3. The display panel according to claim 1 or 2, wherein, A gas or a flexible medium is filled between the thin film encapsulation and the light wavelength conversion layer and around the elastic lens layer, and the refractive index of the gas or the flexible medium is lower than the refractive index of the elastic lens layer.

4. The display panel according to claim 1, wherein, The adjacent first color light wavelength conversion layer and the second color light wavelength conversion layer are spaced apart by a spacer in a direction parallel to the substrate.

5. The display panel according to claim 4, wherein, The inner angle formed between the sloping surface of the spacer facing the first color light wavelength conversion layer or the second color light wavelength conversion layer and the surface of the spacer facing the substrate is less than 90 degrees.

6. The display panel according to claim 5, wherein, The area of the orthographic projection of the surface of the spacer facing the substrate on the substrate is larger than the area of the orthographic projection of the surface of the spacer facing away from the substrate on the substrate.

7. The display panel according to claim 6, wherein, The height h of the first converging lens in a direction perpendicular to the substrate satisfies: Wherein, W is the sum of the width of the first color light wavelength conversion layer and the widths of the spacers on two adjacent sides thereof, and θ1 is the predetermined divergence angle of the excitation light emitted from the light-emitting material layer.

8. The display panel according to any one of claims 4 to 7, wherein, The excitation light emitted by the light-emitting material layer has a third color. The display panel further includes a third-color light-transmitting layer, which is located on the side of the second electrode layer away from the substrate, and is used for transmitting the excitation light. The elastic lens layer further includes a third converging lens, and the orthographic projection of the third converging lens on the substrate at least partially overlaps with the orthographic projection of the third-color light-transmitting layer on the substrate.

9. The display panel according to any one of claims 4 to 7 further includes a filter layer, which is located on the side of the at least one wavelength conversion layer away from the substrate, and the filter layer is used for filtering the light emitted by the first-color wavelength conversion layer and the second-color wavelength conversion layer. The filter layer is a thin-film filter.

10. The display panel according to claim 9, wherein, The filter layer includes a long-pass filter film, the orthographic projection of the long-pass filter film on the substrate covers the orthographic projection of the first-color wavelength conversion layer on the substrate and the orthographic projection of the second-color wavelength conversion layer on the substrate. The passband wavelength range of the long-pass filter film at least partially covers the desired emission wavelength range of the first-color wavelength conversion layer and the desired emission wavelength range of the second-color wavelength conversion layer, and the stopband wavelength range of the long-pass filter film covers the wavelength range of the excitation light emitted by the light-emitting material layer.

11. The display panel according to claim 9, wherein, The filter layer includes: a first-color filter film, the orthographic projection of the first-color filter film on the substrate covers the orthographic projection of the first-color wavelength conversion layer on the substrate, and the first-color filter film is configured to filter out light of other wavelengths except for the desired emission wavelength range of the first-color wavelength conversion layer; and a second-color filter film, the orthographic projection of the second-color filter film on the substrate covers the orthographic projection of the second-color wavelength conversion layer on the substrate, and the second-color filter film is configured to filter out light of other wavelengths except for the desired emission wavelength range of the second-color wavelength conversion layer.

12. The display panel according to any one of claims 4 to 7, wherein, The surface of one or more of the at least one wavelength conversion layer on the side away from the substrate has the shape of a converging lens surface.

13. The display panel according to claim 9 further includes a color filter cover plate, which is located on the side of the filter layer away from the substrate.

14. An electronic device includes the display panel according to any one of claims 1 to 13.

15. A method for manufacturing a display panel includes: providing a substrate and sequentially forming a first electrode layer, a light-emitting material layer, and a second electrode layer on the substrate to form an array substrate; providing a color filter cover plate and forming at least one wavelength conversion layer on the color filter cover plate; and forming an elastic lens layer on the side of the at least one wavelength conversion layer away from the color filter cover plate to make a color filter substrate, wherein the elastic lens layer is located on the side of the second electrode layer away from the substrate and on the side of the wavelength conversion layer facing the substrate, and the elastic lens layer is configured to converge the excitation light emitted from the light-emitting material layer. The method further includes: forming a thin film encapsulation between the elastic lens layer and the second electrode layer; forming a protective layer between the elastic lens layer and the light wavelength conversion layer, wherein a height of the elastic lens layer in a direction perpendicular to the substrate is equal to a distance in the direction perpendicular to the substrate from a surface of the protective layer facing the substrate to a surface of the thin film encapsulation facing away from the substrate; wherein the at least one light wavelength conversion layer includes a first color light wavelength conversion layer and a second color light wavelength conversion layer, the elastic lens layer includes a first converging lens and a second converging lens, a positive projection of the first converging lens on the substrate completely covers a positive projection of the first color light wavelength conversion layer on the substrate, and a positive projection of the second converging lens on the substrate completely covers a positive projection of the second color light wavelength conversion layer on the substrate.

16. The manufacturing method of the display panel according to claim 15, wherein, Before forming the at least one light wavelength conversion layer, the method further includes: forming a filter layer on the color film cover plate; forming a plurality of spacer portions on a side of the filter layer facing away from the color film cover plate, and an opening area is provided between the spacer portions; wherein the at least one light wavelength conversion layer is formed in the opening area, and adjacent light wavelength conversion layers are spaced apart by the spacer portions.

17. The manufacturing method of the display panel according to claim 16, wherein, Before forming the filter layer, the method further includes: forming a black matrix layer on the color film cover plate, wherein the filter layer is located on a side of the black matrix layer facing away from the color film substrate.

18. The method for manufacturing a display panel according to any one of claims 15 to 17 further includes: assembling the color film substrate and the array substrate together to form a display panel.

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