Display panel and display device

Abstract

A display panel and a display device. The display panel comprises a display substrate, a black matrix, a first refraction layer, a second refraction layer, and a color film layer. The display substrate comprises a base, a pixel defining layer, and a plurality of light-emitting elements. The pixel defining layer is located on one side of the base, an opening is formed in the pixel defining layer, and the light-emitting elements are located in the opening. The black matrix and the color film layer are sequentially stacked away from the display substrate. The first refraction layer and the second refraction layer are located between the color film layer and the black matrix. In any arrangement direction of the light-emitting elements, the first refraction layer and the second refraction layer are alternately distributed and are in contact with each other. The orthographic projections of the first refraction layer, the black matrix, and the pixel defining layer on the base overlap, and the orthographic projections of the color film layer, the second refraction layer, and the light-emitting elements on the base overlap. The refractive index of the second refraction layer is greater than or equal to the refractive index of the first refraction layer.

Description

Display panel and display device TECHNICAL FIELD

[0001] The embodiments of the present disclosure belong to the technical field of display, and particularly relate to a display panel and a display device. BACKGROUND

[0002] OLED (Organic Light-Emitting Diode) display screens are widely concerned due to their advantages of self-luminous, low power consumption, thinness, flexibility, bright colors, high contrast, fast response rate, etc.

[0003] SUMMARY

[0004] In one aspect, the present disclosure provides a display panel, comprising a display substrate, a black matrix, a first refractive layer, a second refractive layer and a color film layer,

[0005] The display substrate comprises a substrate, a pixel defining layer and a light emitting element, the pixel defining layer is located on one side of the substrate, the pixel defining layer has an opening, and the light emitting element is located in the opening.

[0006] The black matrix and the color film layer are stacked away from the display substrate in sequence,

[0007] The first refractive layer and the second refractive layer are located between the color film layer and the black matrix.

[0008] Along any arrangement direction of the light emitting element, the first refractive layer and the second refractive layer are alternately distributed and in contact with each other,

[0009] The orthogonal projection of any two of the first refractive layer, the black matrix and the pixel defining layer on the substrate overlaps; the orthogonal projection of any two of the color film layer, the second refractive layer and the light emitting element on the substrate overlaps.

[0010] The refractive index of the second refractive layer is greater than or equal to the refractive index of the first refractive layer.

[0011] In some embodiments, the orthogonal projection of the second refractive layer on the substrate covers the orthogonal projection of the light emitting element on the substrate,

[0012] The color film layer comprises a plurality of color films of different colors, and the plurality of color films of different colors correspond one-to-one to a plurality of light emitting elements.

[0013] The orthogonal projection of a corresponding color film in the plurality of color films on the substrate covers the orthogonal projection of the second refractive layer and the light emitting element on the substrate.

[0014] In some embodiments, the second refractive layer does not overlap with the black matrix in the orthographic projection of the substrate,

[0015] The abutting side surfaces of the first and second refractive layers form an abutting interface, which forms an acute angle with the side surface of the first refractive layer close to the display substrate.

[0016] In some embodiments, the orthographic projection of the first refractive layer on the substrate covers the orthographic projection of the black matrix on the substrate,

[0017] The orthographic projection of the first refractive layer on the substrate is located within the area of the orthographic projection of the pixel defining layer on the substrate.

[0018] In some embodiments, the color film partially overlaps with the first refractive layer located around the corresponding light emitting element in the orthographic projection of the substrate.

[0019] In some embodiments, the color film at least partially overlaps with the black matrix located around the corresponding light emitting element in the orthographic projection of the substrate,

[0020] The color film does not overlap with the corresponding light emitting element and the area other than the black matrix around the corresponding light emitting element in the orthographic projection of the substrate.

[0021] In some embodiments, the refractive index of the second refractive layer is greater than the refractive index of the first refractive layer,

[0022] The distance between the side surface of the second refractive layer away from the display substrate and the display substrate is less than or equal to the distance between the side surface of the first refractive layer away from the display substrate and the display substrate.

[0023] In some embodiments, the refractive index of the second refractive layer is equal to the refractive index of the first refractive layer, and the refractive index of the color film layer is greater than the refractive index of the first refractive layer,

[0024] The distance between the side surface of the second refractive layer away from the display substrate and the display substrate is less than the distance between the side surface of the first refractive layer away from the display substrate and the display substrate.

[0025] In some embodiments, the acute angle ranges from 50 to 70 degrees.

[0026] In some embodiments, the distance between the corresponding side boundaries of the first refractive layer and the pixel defining layer ranges from 0 to 2 μm,

[0027] The distance between the pixel defining layer and the corresponding side boundary of the black matrix ranges from 3 to 6 μm.

[0028] In some embodiments, the thickness of the black matrix ranges from 0.8 to 1.5 μm;

[0029] The distance between the side surface of the first refractive layer away from the display substrate and the display substrate ranges from 2 to 4 μm;

[0030] The thickness of the second refractive layer ranges from 1.5 to 4 μm;

[0031] The thickness of the portion of the color filter layer overlapping with the opening ranges from 2 to 4.5 μm;

[0032] The thickness of the portion of the color filter layer overlapping with the first refractive layer and not overlapping with the black matrix ranges from 1.5 to 4 μm.

[0033] In some embodiments, the refractive index of the second refractive layer is greater than 1.5, and the refractive index of the first refractive layer ranges from 1.3 to 1.5;

[0034] Alternatively, the refractive index of the first refractive layer and the second refractive layer both ranges from 1.3 to 1.5.

[0035] In some embodiments, the transmittance of the first refractive layer and the second refractive layer is both greater than or equal to 90%.

[0036] In some embodiments, a protective layer is further included, located on the side of the color filter layer away from the display substrate,

[0037] The orthographic projection of the protective layer on the substrate covers the orthographic projection of the color filter layer on the substrate;

[0038] The protective layer and the first refractive layer or the second refractive layer are made of the same material.

[0039] In another aspect, the embodiments of the present disclosure further provide a display device, which comprises the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0040] The accompanying drawings are included to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification, which together with the present disclosure serve to explain the present disclosure and do not constitute a limitation of the present disclosure. The above and other features and advantages will become more apparent as various example embodiments become more fully known through the following detailed description taken in conjunction with the accompanying drawings, in which:

[0041] FIG. 1a is a schematic view of a partial structure of a display panel in the related art.

[0042] FIG. 1b is a schematic diagram of a partial structure of another display panel in the related art.

[0043] FIG. 1c is a schematic diagram of a partial structure of another display panel in the related art.

[0044] FIG. 1d is a schematic diagram of a partial structure of another display panel in the related art.

[0045] FIG. 2a is a schematic diagram of a partial structure of a display panel in an embodiment of the present disclosure.

[0046] FIG. 2b is a schematic diagram of a partial structure of another display panel in an embodiment of the present disclosure.

[0047] FIG. 2c is a schematic diagram of a partial structure of another display panel in an embodiment of the present disclosure.

[0048] FIG. 2d is a schematic diagram of a partial structure of another display panel in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0049] In order for those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, a display panel and a display device provided by the embodiments of the present disclosure are further described in detail below with reference to the drawings and specific embodiments.

[0050] In the following, the embodiments of the present disclosure will be described more fully with reference to the drawings, of which the embodiments shown can take many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the disclosure to those skilled in the art.

[0051] The embodiments of the present disclosure are not limited to the embodiments shown in the drawings, but include modifications of configurations formed based on manufacturing processes. Therefore, the regions exemplified in the drawings have a schematic property, and the shape of the regions shown in the drawings exemplifies the specific shape of the regions, but is not intended to be restrictive.

[0052] The color film structure and the efficiency improving structure can be two structures for improving the light extraction efficiency of the OLED display panel. The color film structure and the efficiency improving structure are matched to achieve the optimal light extraction efficiency of the OLED display panel, and to reduce the power consumption of the OLED display panel to the minimum, which is a new type of integrated technology that has attracted much attention.

[0053] Referring to FIGS. 1a-1d, the display panel includes a display substrate 1, a pixel defining layer 11 and a light emitting element 12. The pixel defining layer 11 is located on one side of the display substrate 1, and an opening is formed in the pixel defining layer 11. The light emitting element 12 is located in the opening. The efficiency improvement structure 7 is composed of a low refractive index film layer 71 and a high refractive index film layer 72. The color film structure includes a black matrix 2 and color films 50 of different colors. The color films 50 and the high refractive index film layer 72 are arranged at least corresponding to the light emitting element 12. The black matrix 2 and the low refractive index film layer 71 are arranged corresponding to the pixel defining layer 11. A planar layer 8 is further arranged between the color film structure and the efficiency improvement structure 7.

[0054] In the related art, referring to FIG. 1a, the color film structure and the efficiency improvement structure 7 are stacked and arranged above the encapsulation layer 14 of the OLED display substrate 1. The color film structure is arranged on the side of the efficiency improvement structure 7 close to the display substrate 1. The low refractive index film layer 71 and the high refractive index film layer 72 in the efficiency improvement structure 7 are stacked in turn away from the color film structure. This structure has no obvious effect on L decay (i.e., the difference in light intensity between the outgoing light of 0° exit angle and the outgoing light of other exit angles), but because the contact interface between the high refractive index film layer 72 and the low refractive index film layer 71 in the efficiency improvement structure 7 is exposed to the outermost side of the display substrate 1, it can cause the reflectivity of the entire display panel to deteriorate by up to 0.6% compared to the conventional arrangement of the color film structure on the display side of the display substrate 1 (see FIG. 1c).

[0055] Referring to FIG. 1b, the color film structure is arranged on the side of the efficiency improvement structure 7 away from the display substrate 1. The display panel of this structure has a dark state effect close to that of the conventional arrangement of the color film structure on the display side of the display substrate 1 (see FIG. 1c), but because the black matrix 2 in the color film structure is arranged higher relative to the arrangement position of the black matrix 2 in FIG. 1a, it can cause serious deterioration of L decay (i.e., the difference in light intensity between the outgoing light of 0° exit angle and the outgoing light of other exit angles).

[0056] In summary, the OLED display panel structures in FIGS. 1a and 1b cannot adjust the overall optical effect to a relatively optimal state.

[0057] In view of the above problems, referring to FIG. 1d, one improvement idea is to remove the high refractive index film layer in the efficiency improvement structure 7, and arrange the low refractive index film layer 71 between the black matrix 2 and the color film 50, and use the refractive index difference at the contact interface between the low refractive index film layer 71 in the efficiency improvement structure 7 and the color film 50 in the color film structure to achieve the light efficiency improvement effect. However, through actual verification, this structure scheme has a relatively high difficulty in process implementation, because after the black matrix 2 and the low refractive index film layer 71 are stacked, the opening area pit formed thereby is relatively large, causing the thickness of the color film 50 to be significantly thicker than the design value.

[0058] Referring to FIG. 1c, only the color filter structure is provided on the display side of the display substrate 1, in which the thickness of the black matrix 2 ranges from 1 to 1.5 μm, and the thickness of the color filter 50 ranges from 2 to 4 μm. In the display panel shown in FIG. 1d, the total thickness of the stack of the black matrix 2 and the low-refractive film layer 71 can reach close to 3 to 4 μm, resulting in a significant thickening of the color filter 50, which can reach 3 to 6 μm. This will seriously affect the light extraction efficiency of the entire display panel, resulting in poor effects such as power consumption and service life of the entire display panel.

[0059] In addition, in the display panel shown in FIG. 1d, even if the thickness of the color filter 50 is maintained at the design value by adjusting the process capability, there is still a problem that there is a region where the color filter 50 is very thin and is not covered by the black matrix 2, and the reflectivity of this region is very high (the reflection of this region is mainly reflected through the contact interface of the color filter 50 and the low-refractive film layer 71), resulting in a serious deterioration of the reflectivity of the entire display panel compared with the conventional color filter structure provided on the display side of the display substrate 1 (referring to FIG. 1c), and the simulation deterioration value can reach 1%.

[0060] To solve the problem in the related art that the optical effects of the OLED display panel cannot be adjusted to an optimal state as a whole while improving the efficiency of the OLED display panel, the display panel provided in the embodiments of the present disclosure can improve the efficiency while adjusting the L decay effect and the reflectivity effect to an optimal state.

[0061] Referring to FIG. 2a, the display panel includes a display substrate 1, a black matrix 2, a first refractive layer 3, a second refractive layer 4, and a color filter layer 5. The display substrate 1 includes a substrate 10, a pixel definition layer 11 located on one side of the substrate 10, and a plurality of light emitting elements 12 located in a plurality of openings 110 formed in the pixel definition layer 11. The black matrix 2 and the color filter layer 5 are stacked away from the display substrate 1 in sequence, and the first refractive layer 3 and the second refractive layer 4 are located between the color filter layer 5 and the black matrix 2. Along any arrangement direction of the light emitting elements 12, the first refractive layer 3 and the second refractive layer 4 are alternately distributed and in contact with each other, the orthographic projection of any two of the first refractive layer 3, the black matrix 2, and the pixel definition layer 11 on the substrate 10 overlaps; the orthographic projection of any two of the color filter layer 5, the second refractive layer 4, and the light emitting elements 12 on the substrate 10 overlaps; the first refractive layer 3, the second refractive layer 4, and the color filter layer 5 are in contact with each other, and the refractive index of the second refractive layer 4 is greater than or equal to the refractive index of the first refractive layer 3.

[0062] By locating the first refractive layer 3 and the second refractive layer 4 between the color filter layer 5 and the black matrix 2, and alternately distributing the first refractive layer 3 and the second refractive layer 4 along any arrangement direction of the light emitting element 12, compared with the structure of the high refractive index film layer 72 of the efficiency improvement structure in the related art, in the embodiment, the second refractive layer 4 with a refractive index higher than that of the first refractive layer 3 is patterned, and the orthographic projection of the pattern of the second refractive layer 4 on the substrate 10 overlaps with the orthographic projection of the light emitting element 12 and the color filter layer 5 on the substrate 10, compared with the scheme in FIG. 1d in the related art, on the one hand, the refractive index difference between the contact interface between the first refractive layer 3 and the second refractive layer 4 and the color filter layer 5 can be realized, so that the light irradiated to the contact interface is refracted into the region corresponding to the opening 110, thereby improving the light emitting efficiency of the light emitting element 12; on the other hand, compared with the scheme in FIG. 1d in the related art, the thickness of the color filter layer 5 remains unchanged, and most of the external ambient light can be absorbed by the color filter layer 5, so that the reflectivity of the display panel will not be deteriorated; on the other hand, compared with the scheme in FIG. 1b in the related art, since the position of the black matrix 2 relative to the display substrate 1 does not change, the L decay (i.e. the difference in light intensity between the outgoing light at 0° exit angle and the outgoing light at other exit angles) effect of the display panel in the embodiment is also relatively good; and further, the efficiency of the display panel can be improved while the L decay effect and the reflectivity effect of the display panel are adjusted to a relatively good state.

[0063] In some embodiments, referring to FIG. 2a, the orthographic projection of the second refractive layer 4 on the substrate 10 covers the orthographic projection of the light emitting element 12 on the substrate 10, and the color filter layer 5 includes a plurality of color filters 50 of different colors, the plurality of color filters 50 of different colors correspond to the plurality of light emitting elements 12 one by one, and the orthographic projection of the color filter 50 on the substrate 10 covers the orthographic projection of the second refractive layer 4 and the light emitting element 12 on the substrate 10.

[0064] In some embodiments, referring to FIG. 2a, the orthographic projection of the second refractive layer 4 on the substrate 10 does not overlap with the orthographic projection of the black matrix 2 on the substrate 10, and the adjacent side surfaces of the first refractive layer 3 and the second refractive layer 4 are abutted to form an abutted interface p, and the abutted interface p and the side surface of the first refractive layer 3 close to the display substrate 1 form an acute angle θ.

[0065] When the refractive index of the second refractive layer 4 is greater than the refractive index of the first refractive layer 3, the above-mentioned abutted interface p can refract the light irradiated thereon into the region corresponding to the opening 110, thereby improving the light emitting efficiency of the light emitting element 12. At the same time, the color filter layer 5 also contacts the abutted interface p of the first refractive layer 3, so that when the refractive index of the second refractive layer 4 is equal to the refractive index of the first refractive layer 3 and the refractive index of the color filter layer 5 is greater than the refractive index of the first refractive layer 3, the contact interface between the color filter layer 5 and the first refractive layer 3 can refract the light irradiated thereon into the region corresponding to the opening 110, thereby improving the light emitting efficiency of the light emitting element 12.

[0066] In some embodiments, the acute included angle θ ranges from 50° to 70°. The acute included angle θ in this range can cause the light passing through the color film layer 5 and the second refractive layer 4 to be totally reflected when it strikes the interface p, thereby improving the light extraction effect of the light rays with 0° exit angle of the display panel, and facilitating the collimation of the light of the display panel.

[0067] In some embodiments, referring to FIG. 2a, the orthographic projection of the first refractive layer 3 on the substrate 10 covers the orthographic projection of the black matrix 2 on the substrate 10, and the orthographic projection of the first refractive layer 3 on the substrate 10 is located within the orthographic projection area of the pixel defining layer 11 on the substrate 10.

[0068] In some embodiments, referring to FIG. 2a, the distance s1 between the corresponding side boundaries of the first refractive layer 3 and the pixel defining layer 11 ranges from 0 μm to 2 μm, and the distance s2 between the corresponding side boundaries of the pixel defining layer 11 and the black matrix 1 ranges from 3 μm to 6 μm.

[0069] In some embodiments, referring to FIG. 2a, the color film 50 partially overlaps the orthographic projection of the first refractive layer 3 on the substrate 10 around the corresponding light emitting element 12.

[0070] In some embodiments, referring to FIG. 2a, the color film 50 at least partially overlaps the orthographic projection of the black matrix 2 on the substrate 10 around the corresponding light emitting element 12, and the orthographic projection of the color film 50 on the substrate 10 around the corresponding light emitting element 12 and the black matrix 2 around the corresponding light emitting element 12 does not overlap. In this way, the color film 50 of different colors can correspond to light emitting elements 12 of different colors, and the color film 50 can avoid causing color interference of the light emitting color of the light emitting element 12 adjacent to the corresponding light emitting element 12.

[0071] In some embodiments, the refractive index of the second refractive layer 4 is greater than the refractive index of the first refractive layer 3, and the distance h1 between the side surface of the second refractive layer 4 away from the display substrate 1 and the display substrate 1 is less than (referring to FIG. 2a) or equal to (referring to FIG. 2b) the distance h2 between the side surface of the first refractive layer 3 away from the display substrate 1 and the display substrate 1.

[0072] The color film 50 also extends to partially overlap the first refractive layer 3 around the corresponding light emitting element 12. Compared with the scheme in FIG. 1d, on the one hand, due to the elevation of the second refractive layer 4, the thickness of the part of the color film 50 overlapping the first refractive layer 3 and not overlapping the black matrix 2 is equal to or close to the thickness of the central part of the color film 50 (i.e., the part overlapping both the light emitting element 12 and the second refractive layer 4), so that the color film 50 can effectively absorb ambient light and prevent the reflectivity of the display panel from deteriorating. On the other hand, the use of the second refractive layer 4 for elevation can maximize the area of the contact interface between the first refractive layer 3 and the second refractive layer 4, thereby ensuring the improvement of the efficiency of the display panel by the first refractive layer 3 and the second refractive layer 4.

[0073] In some embodiments, referring to FIG. 2c, the refractive index of the second refractive layer 4 is equal to the refractive index of the first refractive layer 3, the refractive index of the color film layer 5 is greater than the refractive index of the first refractive layer 3, and the distance h1 between the side surface of the second refractive layer 4 away from the display substrate 1 and the display substrate 1 is less than the distance h2 between the side surface of the first refractive layer 3 away from the display substrate 1 and the display substrate 1.

[0074] In this embodiment, the first refractive layer 3 and the second refractive layer 4 are made of the same material. Compared with the scheme in FIG. 1d, on the one hand, due to the elevation of the second refractive layer 4, the thickness of the part of the color film layer 5 overlapping the first refractive layer 3 and not overlapping the black matrix 2 is close to the thickness of the central part of the color film layer 5 (i.e., the part overlapping both the light emitting element 12 and the second refractive layer 4), so that the color film layer 5 can effectively absorb ambient light and prevent the reflectivity of the display panel from deteriorating. On the other hand, the distance h1 between the side surface of the second refractive layer 4 away from the display substrate 1 and the display substrate 1 is less than the distance h2 between the side surface of the first refractive layer 3 away from the display substrate 1 and the display substrate 1, which can ensure the area of the contact interface between the first refractive layer 3 and the color film layer 5, thereby ensuring the improvement of the efficiency of the display panel by the refractive index difference between the first refractive layer 3 and the color film layer 5. In this embodiment, unlike the display panel in which the refractive index of the second refractive layer 4 is greater than the refractive index of the first refractive layer 3, the area of the contact interface between the film layers with a refractive index difference between the first refractive layer 3 and the second refractive layer 4 and the color film layer 5 is the area of the contact interface between the first refractive layer 3 and the color film layer 5, i.e., the area of the contact interface between the film layers with a refractive index difference is relatively reduced, so that the light extraction efficiency of the display panel in this embodiment is slightly worse than that of the display panel in which the refractive index of the second refractive layer 4 is greater than the refractive index of the first refractive layer 3, and the difference between the other optical indicators of the two is not large.

[0075] In some embodiments, referring to FIG. 2d, the thickness d1 of the black matrix 2 ranges from 0.8 to 1.5 μm; the distance h2 between the side surface of the first refractive layer 3 away from the display substrate 1 and the display substrate 1 ranges from 2 to 4 μm; the thickness h1 of the second refractive layer 4 ranges from 1.5 to 4 μm; the thickness d2 of the portion of the color filter 50 overlapping the opening 110 ranges from 2 to 4.5 μm; and the thickness d3 of the portion of the color filter 50 overlapping the first refractive layer 3 and not overlapping the black matrix 2 ranges from 1.5 to 4 μm. It can be seen that the thickness d2 of the portion of the color filter 50 overlapping the opening 110 and the thickness d3 of the portion of the color filter 50 overlapping the first refractive layer 3 and not overlapping the black matrix 2 are not much different, so that the color filter 50 can effectively absorb ambient light and prevent the reflectivity of the display panel from deteriorating.

[0076] In some embodiments, the display panel schemes in FIGS. 1a, 1b and 1d and the display panel scheme in FIG. 2a in which the refractive index of the second refractive layer 4 is greater than the refractive index of the first refractive layer 3 are compared, and the Ldecay effect and the reflectivity effect are as shown in Table 1.

[0077] Table 1

[0078] In some embodiments, the refractive index of the second refractive layer 4 is greater than 1.5, and the refractive index of the first refractive layer 3 ranges from 1.3 to 1.5; or the refractive index of the first refractive layer 3 and the second refractive layer 4 both ranges from 1.3 to 1.5.

[0079] In some embodiments, the transmittance of the first refractive layer 3 and the second refractive layer 4 is greater than or equal to 90%.

[0080] In some embodiments, the display panel further comprises a protective layer 6 located on the side of the color filter layer 5 away from the display substrate 1, and the orthogonal projection of the protective layer 6 on the base 10 covers the orthogonal projection of the color filter layer 5 on the base 10; the protective layer 6 and the first refractive layer 3 or the second refractive layer 4 are made of the same material.

[0081] In some embodiments, the protective layer 6, the first refractive layer 3 and the second refractive layer 4 are all made of organic resin materials, such as polyimide, polyurethane and the like.

[0082] In some embodiments, the display substrate 1 further comprises a pixel circuit 13 disposed between the pixel defining layer 11 and the base 10, and an encapsulation layer 14 located on the side of the light emitting element 12 and the pixel defining layer 11 away from the base 10, the encapsulation layer 14 encapsulating the light emitting element 12. The encapsulation layer 14 comprises an inorganic encapsulation layer and an organic encapsulation layer stacked in sequence, and the surface of the encapsulation layer 14 away from the base 10 is planar, the black matrix 2, the first refractive layer 3, the second refractive layer 4 and the color filter layer 5 are sequentially disposed above the planar surface of the encapsulation layer 14. The light emitting element 12 comprises an anode 121, a light emitting functional layer 122 and a cathode 123, which are stacked in sequence away from the base 10, and the overlapping area of the orthographic projection of the anode 121, the light emitting functional layer 122 and the cathode 123 in the opening 110 of the pixel defining layer 11 is the effective light emitting area of the light emitting element 12.

[0083] Based on the above structure of the display panel, when the refractive index of the second refractive layer is greater than the refractive index of the first refractive layer, the display panel is prepared by sequentially preparing the black matrix, the first refractive layer, the second refractive layer and the color filter layer on one side of the display substrate, and the black matrix, the first refractive layer, the second refractive layer and the color filter layer are respectively prepared by the processes of coating, film forming, exposure and development.

[0084] Based on the above structure of the display panel, when the refractive index of the second refractive layer is equal to the refractive index of the first refractive layer, the display panel is prepared by first preparing the black matrix on one side of the display substrate, then preparing the first refractive layer and the second refractive layer by a half-tone exposure process, and finally preparing the color filter layer; the black matrix and the color filter layer are respectively prepared by the processes of coating, film forming, exposure and development; the first refractive layer and the second refractive layer are simultaneously prepared by the processes of coating, film forming, half-tone exposure and development. The half-tone exposure process can reduce one mask process compared with the processes of preparing the first refractive layer and the second refractive layer respectively.

[0085] The display panel provided in the embodiment can realize the refractive index difference of the contact interface between the first refractive layer, the second refractive layer and the color film layer, refract the light irradiated to the contact interface into the opening corresponding area, thereby improving the light emitting efficiency of the light emitting element; on the other hand, the thickness of the color film layer remains unchanged, most of the external environment light can be absorbed by the color film layer, thereby the reflectivity of the display panel will not be deteriorated; on the other hand, the position of the black matrix relative to the display substrate does not change, thereby the L decay (i.e. the difference in light intensity between the 0° exit angle and other exit angles) effect of the display panel in the embodiment is also better; and further, the efficiency of the display panel can be improved while the L decay effect and the reflectivity effect of the display panel are adjusted to a better state.

[0086] The display device provided in the embodiment of the present disclosure comprises the display panel in the above embodiment.

[0087] By using the display panel in the above embodiment, the efficiency of the display device can be improved while the L decay effect and the reflectivity effect of the display device are adjusted to a better state.

[0088] The display device provided in the embodiment of the present disclosure can be an OLED panel, an OLED television, an OLED billboard, a display, a mobile phone, a navigator or any product or component with display function.

[0089] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered as the protection scope of the present disclosure.

Claims

1. A display panel comprising a display substrate, a black matrix, a first refractive layer, a second refractive layer and a color filter layer. in, The display substrate includes a base, a pixel defining layer and a light-emitting element, wherein the pixel defining layer is located on one side of the base, an opening is formed in the pixel defining layer, and the light-emitting element is located in the opening; The black matrix and the color filter layer are stacked in sequence away from the display substrate. Wherein, the first refractive layer and the second refractive layer are located between the color filter layer and the black matrix; Along any arrangement direction of the light emitting elements, the first refractive layers and the second refractive layers are alternately distributed and contact each other. The orthographic projections of any two of the first refractive layer, the black matrix, and the pixel defining layer on the substrate overlap; the orthographic projections of any two of the color filter layer, the second refractive layer, and the light-emitting element on the substrate overlap; The refractive index of the second refractive layer is greater than or equal to the refractive index of the first refractive layer.

2. The display panel according to claim 1, wherein: The orthographic projection of the second refractive layer on the substrate covers the orthographic projection of the light emitting element on the substrate, The color filter layer includes a plurality of color filters of different colors, and the plurality of color filters of different colors correspond one to one to a plurality of light emitting elements. The orthographic projection of a corresponding color film among the plurality of color films on the substrate covers the orthographic projection of the second refractive layer and the light emitting element on the substrate.

3. The display panel according to claim 2, wherein: The second refractive layer does not overlap with the orthographic projection of the black matrix on the substrate, The adjacent side surfaces of the first refractive layer and the second refractive layer are butted together to form a butt interface, and the butt interface forms an acute angle with the side surface of the first refractive layer close to the display substrate. horn.

4. The display panel according to claim 3, wherein: The orthographic projection of the first refractive layer on the substrate covers the orthographic projection of the black matrix on the substrate, The orthographic projection of the first refractive layer on the substrate is located within the orthographic projection area of ​​the pixel defining layer on the substrate.

5. The display panel according to claim 4, wherein: The color filter partially overlaps with the orthographic projection of the first refractive layer located around the corresponding light-emitting element on the substrate. The display panel according to claim 5 , wherein: The color filter and the orthographic projection of the black matrix located around the corresponding light-emitting element on the substrate at least partially overlap, The orthographic projections of the color filter, the corresponding light-emitting element, and the area outside the black matrix surrounding the corresponding light-emitting element on the substrate do not overlap.

7. The display panel according to any one of claims 1 to 6, wherein: The refractive index of the second refractive layer is greater than the refractive index of the first refractive layer, A distance between a surface of the second refractive layer on a side away from the display substrate and the display substrate is less than or equal to a distance between a surface of the first refractive layer on a side away from the display substrate and the display substrate.

8. The display panel according to any one of claims 1 to 6, wherein: The refractive index of the second refractive layer is equal to the refractive index of the first refractive layer, and the refractive index of the color filter layer is greater than the refractive index of the first refractive layer. A distance between a surface of the second refractive layer on a side away from the display substrate and the display substrate is smaller than a distance between a surface of the first refractive layer on a side away from the display substrate and the display substrate.

9. The display panel according to claim 3, wherein: The acute angle ranges from 50° to 70°.

10. The display panel according to claim 4, wherein: The distance between the corresponding side boundaries of the first refractive layer and the pixel defining layer ranges from 0 to 2 μm. The distance between the pixel defining layer and corresponding side boundaries of the black matrix ranges from 3 μm to 6 μm.

11. The display panel according to claim 7, wherein: The thickness of the black matrix ranges from 0.8 to 1.5 μm; The distance between the surface of the first refractive layer on the side away from the display substrate and the display substrate is in the range of 2 to 4 μm; The thickness of the second refractive layer ranges from 1.5 to 4 μm; The thickness of the portion of the color film overlapping the opening is in the range of 2 to 4.5 μm; The thickness of the portion of the color film that overlaps with the first refractive layer and does not overlap with the black matrix ranges from 1.5 to 4 μm.

12. The display panel according to claim 1, wherein: The refractive index of the second refractive layer is greater than 1.5, and the refractive index of the first refractive layer is in the range of 1.3 to 1.5; Alternatively, the refractive index of the first refractive layer and the refractive index of the second refractive layer are both in the range of 1.3 to 1.

5.

13. The display panel according to claim 1, wherein: The transmittance of the first refractive layer and the second refractive layer are both greater than or equal to 90%.

14. The display panel according to claim 1, wherein: It also includes a protective layer located on the side of the color filter layer away from the display substrate. The orthographic projection of the protective layer on the substrate covers the orthographic projection of the color filter layer on the substrate. film; The protective layer and the first refractive layer or the second refractive layer are made of the same material.

15. A display device, wherein: The display panel comprises the display panel according to any one of claims 1 to 14.

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