Display substrate, manufacturing method thereof and display device

Abstract

The invention discloses a display substrate, a manufacturing method thereof and a display device. The display substrate comprises a substrate body and a plurality of sub-pixels arranged on the substrate body, and each sub-pixel comprises a pixel opening area (K1); the display substrate further comprises a plurality of lens units (1), and at least parts of the lens units (1) are located in the corresponding pixel opening areas (K1). The lens unit (1) comprises a plurality of lenses (10) distributed in an array, each lens (10) comprises a central lens part (101) and at least one surrounding lens part (102), and the surrounding lens parts (102) surround the central lens parts (101).

Description

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

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

[0002] With the continuous development of display technology, the application areas of display products are becoming increasingly broad, and the types of display products are also increasing. Among large-scale organic light-emitting diode (OLED) display products, the bottom-emitting OLED architecture is currently the most important direction for large-scale WOLED due to its high technical maturity and simplicity. However, since the pixel circuits in display products occupy a large space, the pixel aperture ratio of the display products is relatively small. Therefore, improving the light extraction efficiency of display products is crucial.

[0003] Summary of the Invention

[0004] The present disclosure aims to provide a display substrate, a method for manufacturing the same, and a display device.

[0005] In order to achieve the above objectives, the present disclosure provides the following technical solutions:

[0006] A first aspect of the present disclosure provides a display substrate, comprising: a base substrate and a plurality of sub-pixels disposed on the base substrate, wherein the sub-pixels include pixel opening regions; the display substrate further comprises a plurality of lens units, wherein at least portions of the lens units are located within corresponding pixel opening regions;

[0007] The lens unit includes a plurality of lenses distributed in an array, wherein the lens includes a central lens portion and at least one surrounding lens portion surrounding the central lens portion.

[0008] Optionally, the orthographic projection of the central lens portion on the substrate has a first boundary, and the orthographic projection of the surrounding lens portion on the substrate has an outer boundary away from the central lens portion, and the shape of the outer boundary is the same as that of the first boundary.

[0009] Optionally, along the extension direction of the symmetry axis of the central lens portion, a difference d1 between the width of the central lens portion and the width of the surrounding lens portion satisfies: d1 is less than or equal to 0.3 μm.

[0010] Optionally, the central lens portion includes a first edge portion, the first edge portion's orthographic projection on the substrate forms the first boundary; the surrounding lens portion includes an outer edge portion, the outer edge portion's orthographic projection on the substrate forms the outer boundary; in a direction perpendicular to the substrate, a difference h1 between a height of the first edge portion and a height of the outer edge portion satisfies: h1 is less than or equal to 0.3 μm.

[0011] Optionally, the central lens portion includes a first edge portion, the first edge portion's orthographic projection on the substrate forms the first boundary; the surrounding lens portion includes an outer edge portion, the outer edge portion's orthographic projection on the substrate forms the outer boundary; in a direction parallel to the substrate, a difference d2 between a width of the first edge portion and a width of the outer edge portion satisfies: d2 is less than or equal to 0.3 μm.

[0012] Optionally, in a direction perpendicular to the substrate, a difference h2 between the maximum depth of the central lens portion and the maximum depth of the surrounding lens portion satisfies: h2 is less than or equal to 0.3 μm.

[0013] Optionally, the shape of the outer boundary includes a regular hexagon.

[0014] Optionally, the central lens portion includes a first edge portion, the first edge portion includes alternating first edges and first corners, adjacent first edges and first corners are coupled, and the height of the first edges gradually decreases in a direction away from the first corner to which they are coupled.

[0015] Optionally, the surrounding lens portion includes an outer edge portion, the outer edge portion includes alternating outer edge portions and outer corner portions, adjacent outer edge portions and outer corner portions are coupled, and the height of the outer edge portion gradually decreases in a direction away from the outer corner portion to which it is coupled.

[0016] Optionally, in the lens unit, a contact portion is formed between three adjacent lenses, and a surface of the contact portion facing away from the substrate forms a sharp angle.

[0017] Optionally, the display substrate further includes a pixel defining layer, which defines the pixel opening area, and the orthographic projection of some lenses located at the edge of the pixel opening area in at least part of the lens units on the base substrate at least partially overlaps with the orthographic projection of the pixel defining layer on the base substrate.

[0018] Optionally, the lens includes a first surrounding lens portion and a second surrounding lens portion, wherein the first surrounding lens portion surrounds the central lens portion, and the second surrounding lens portion surrounds the first surrounding lens portion.

[0019] Optionally, the multiple sub-pixels include a first color sub-pixel and a second color sub-pixel, the driving current corresponding to the first color sub-pixel is greater than the driving current corresponding to the second color sub-pixel, and the filling rate of the lens unit in the pixel opening area of ​​the first color sub-pixel is greater than the filling rate of the lens unit in the pixel opening area of ​​the second color sub-pixel.

[0020] Optionally, the multiple sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, a driving current corresponding to the red sub-pixel is greater than a driving current corresponding to the green sub-pixel, and a driving current corresponding to the green sub-pixel is greater than a driving current corresponding to the blue sub-pixel;

[0021] The filling rate of the lens unit in the pixel opening area of ​​the red sub-pixel is greater than the filling rate of the lens unit in the pixel opening area of ​​the green sub-pixel; the filling rate of the lens unit in the pixel opening area of ​​the green sub-pixel is greater than the filling rate of the lens unit in the pixel opening area of ​​the blue sub-pixel.

[0022] Optionally, the multiple sub-pixels also include a white sub-pixel, the driving current corresponding to the white sub-pixel is smaller than the driving current corresponding to the blue sub-pixel, and the filling rate of the lens unit in the pixel opening area of ​​the white sub-pixel is smaller than the filling rate of the lens unit in the pixel opening area of ​​the blue sub-pixel.

[0023] Optionally, the plurality of sub-pixels include a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel;

[0024] The pixel opening area included in the white sub-pixel is not filled with the lens unit; or,

[0025] The pixel opening area included in at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel is not filled with the lens unit; or,

[0026] The lens unit is not filled in the pixel opening area of ​​the white sub-pixel, and the lens unit is not filled in the pixel opening area of ​​at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel.

[0027] Optionally, the display substrate further includes a driving circuit layer and a color filter layer, the driving circuit layer is located on the side of the color filter layer facing the base substrate, the color filter layer is located on the side of the lens unit facing the base substrate, and the orthographic projection of the color filter layer on the base substrate at least partially overlaps with the orthographic projection of the pixel opening area on the base substrate.

[0028] Based on the technical solution of the above-mentioned display substrate, a second aspect of the present disclosure provides a display device including the above-mentioned display substrate.

[0029] Based on the technical solution of the above-mentioned display substrate, a third aspect of the present disclosure provides a method for manufacturing a display substrate, which is used to manufacture the above-mentioned display substrate. The display substrate includes: a base substrate and a plurality of sub-pixels arranged on the base substrate, wherein the sub-pixels include pixel opening areas; the display substrate also includes a plurality of lens units, wherein at least portions of the lens units are located within corresponding pixel opening areas; the manufacturing method includes the steps of manufacturing the lens units, which specifically include:

[0030] forming an organic material layer on a base substrate;

[0031] forming a photoresist layer on a side of the organic material layer facing away from the base substrate, and patterning the photoresist layer to form a photoresist pattern;

[0032] The organic material layer is etched using the photoresist pattern as a mask to form the lens unit, wherein the lens unit includes a plurality of lenses distributed in an array, each lens including a central lens portion and at least one surrounding lens portion, wherein the surrounding lens portion surrounds the central lens portion.

[0033] Optionally, the step of etching the organic material layer using the photoresist pattern as a mask specifically includes: after etching to form the lens unit, extending the etching time, forming a contact portion between three adjacent lenses in the lens unit, and forming a sharp corner on the surface of the contact portion facing away from the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0035] FIG1 is a schematic plan view of a lens provided by an embodiment of the present disclosure;

[0036] FIG2 is an electron microscope image of a lens unit provided by an embodiment of the present disclosure;

[0037] FIG3 is an electron microscope image of a lens unit provided by an embodiment of the present disclosure;

[0038] FIG4 is a schematic plan view of a lens provided in an embodiment of the present disclosure;

[0039] FIG5 is a schematic diagram of a lens unit layout of an RGBW sub-pixel provided by an embodiment of the present disclosure;

[0040] FIG6 is a plan view of a lens provided by an embodiment of the present disclosure;

[0041] FIG7 is a schematic cross-sectional view of a film layer of a sub-pixel provided by an embodiment of the present disclosure;

[0042] FIG8 is a schematic diagram of a lens unit layout of an RGBW sub-pixel provided by an embodiment of the present disclosure;

[0043] FIG9 is a schematic cross-sectional view along the A1A2 direction in FIG8 ;

[0044] FIG10 is a schematic cross-sectional view of a complete lens along the direction A3A4 in FIG8 ;

[0045] FIG11 is an electron microscope image of a lens unit provided by an embodiment of the present disclosure;

[0046] FIG12 is an electron microscope image of a lens unit provided by an embodiment of the present disclosure;

[0047] FIG13 is a schematic diagram of a lens unit layout of an RGBW sub-pixel provided by an embodiment of the present disclosure;

[0048] FIG14 is a schematic cross-sectional view along the B1B2 direction in FIG13 ;

[0049] FIG15 is a schematic diagram of a lens unit layout of an RGBW sub-pixel provided by an embodiment of the present disclosure;

[0050] FIG16 is a schematic cross-sectional view along the B5B6 direction in FIG15 ;

[0051] FIG17 is a schematic diagram of a lens unit layout of an RGBW sub-pixel provided by an embodiment of the present disclosure;

[0052] FIG18 is a schematic cross-sectional view along the B3B4 direction in FIG17 . DETAILED DESCRIPTION

[0053] In order to further illustrate the display substrate and its manufacturing method, and the display device provided by the embodiments of the present disclosure, a detailed description is given below with reference to the accompanying drawings.

[0054] To improve the light extraction efficiency of display products, the present disclosure considers the use of micro lens array (MLA) technology in display products. This MLA technology arranges micro lenses in an array within the pixel opening area of ​​the display product, thereby improving the light extraction efficiency of the display product.

[0055] Referring to FIG. 1 to FIG. 7 , an embodiment of the present disclosure provides a display substrate, comprising: a base substrate and a plurality of sub-pixels disposed on the base substrate, wherein the sub-pixels include a pixel opening area K1; the display substrate further comprises a plurality of lens units 1, wherein at least a portion of the lens units 1 is located within a corresponding pixel opening area K1;

[0056] The lens unit 1 includes a plurality of lenses 10 distributed in an array. The lens 10 includes a central lens portion 101 and at least one surrounding lens portion 102 . The surrounding lens portion 102 surrounds the central lens portion 101 .

[0057] Exemplarily, the display substrate includes a plurality of sub-pixels, each of which includes a plurality of pixel opening areas K1 distributed in an array. The sub-pixels include a sub-pixel driving circuit and a light-emitting element. The sub-pixel driving circuit is coupled to an anode Ano of the light-emitting element and is configured to provide a driving signal to the light-emitting element to drive the light-emitting element to emit light. The light-emitting element further includes a light-emitting functional layer EL, at least a portion of the light-emitting functional layer EL and at least a portion of the anode Ano are both located within the corresponding pixel opening area K1.

[0058] Exemplarily, the plurality of lens units 1 correspond one-to-one to the plurality of pixel opening areas K1 , and at least a portion of the lens unit 1 is located within the corresponding pixel opening area K1 .

[0059] Illustratively, the central lens portion 101 includes a concave portion and a first edge portion 1011 located around the concave portion and connected to the concave portion.

[0060] Illustratively, the surrounding lens portion 102 includes a recessed portion, an inner edge portion of the recessed portion close to the central lens portion 101, and an outer edge portion 1021 of the recessed portion away from the central lens portion 101. For example, the first edge portion 1011 of the central lens portion 101 can be reused as the inner edge portion of the adjacent surrounding lens portion 102.

[0061] For example, the resin layer Resin can be patterned to form the plurality of lens units 1 directly on the resin layer Resin, but the present invention is not limited thereto. It is worth noting that the resin layer is also called a flat layer and can be formed between the sub-pixel driving circuit and the anode Ano of the display substrate, but the present invention is not limited thereto.

[0062] Exemplarily, the lens unit 1 can be arranged between the anode Ano and the base substrate. In the pixel opening area K1, the anode Ano and the light-emitting functional layer EL are both formed on the lens unit 1. The anode Ano, the light-emitting functional layer EL and the cathode located on the lens unit 1 all continue the morphology of the lens.

[0063] According to the specific structure of the display substrate described above, in the display substrate provided by the embodiment of the present disclosure, a lens unit 1 is provided in the pixel opening area K1. The lens unit 1 includes a plurality of lenses distributed in an array. The lens includes a central lens portion 101 and at least one surrounding lens portion 102. The surrounding lens portion 102 surrounds the central lens portion 101. This arrangement forms the lens into a structure in which the central lens portion 101 is nested within the surrounding lens portion 102, so that each lens can form multiple recesses, which is equivalent to increasing the number of lenses included in the lens unit 1 and improving the lens filling rate in the pixel opening area K1, thereby being able to maximize the light extraction efficiency of the pixel opening area K1. Moreover, when laying out the lens unit 1 including the above-mentioned lens structure, it is only necessary to consider the boundary matching between adjacent lenses, without considering the boundary matching between the central lens portion 101 and the surrounding lens portion 102 in each lens. Therefore, while achieving a higher light extraction efficiency, the difficulty of lens layout will not be increased.

[0064] In addition, in the display substrate provided by the embodiment of the present disclosure, the light extraction efficiency can be improved by changing the structure of the lens without increasing the power consumption of the sub-pixel driving circuit, thus being more conducive to saving the overall power consumption of the display substrate.

[0065] As shown in Figures 1 to 7, in some embodiments, the orthographic projection of the central lens portion 101 on the substrate has a first boundary J1, and the orthographic projection of the surrounding lens portion 102 on the substrate has an outer boundary 102w away from the central lens portion 101, and the shape of the outer boundary 102w is the same as the shape of the first boundary J1.

[0066] Exemplarily, the orthographic projection of the central lens portion 101 on the substrate includes an axisymmetric shape. The orthographic projection of the surrounding lens portion 102 on the substrate includes an axisymmetric shape.

[0067] Exemplarily, the orthographic projection of the surrounding lens portion 102 on the substrate has an inner boundary 102n and an outer boundary 102w, wherein the inner boundary 102n is located between the outer boundary 102w and the central lens portion 101. For example, the first boundary J1 of the central lens portion 101 is reused as the inner boundary 102n of the surrounding lens portion 102 adjacent to the central lens portion 101.

[0068] Exemplarily, the orthographic projection of the central lens portion 101 on the substrate includes a circle, a polygon, etc., without specific limitation. For example, the orthographic projection of the central lens portion 101 on the substrate includes a triangle, a quadrilateral, a regular hexagon, etc., but is not limited thereto.

[0069] For example, the first boundary J1 and the outer boundary 102w are both regular hexagons, forming a nested lens design with an inner hexagon and an outer hexagonal ring. This arrangement allows for seamless filling within the pixel opening area K1, thereby maximizing the lens fill rate. Furthermore, the regular hexagonal lens is more precisely manufactured, resulting in less distortion and improving light extraction efficiency.

[0070] In the display substrate provided in the above embodiment, by setting the shape of the outer boundary 102w to be the same as the shape of the first boundary J1, the central lens part 101 and the surrounding lens part 102 can achieve uniformity in lens morphology, thereby greatly improving the light extraction efficiency of the pixel opening area K1.

[0071] As shown in FIG2 and FIG11 , in some embodiments, along the extension direction of the symmetry axis of the central lens portion 101 , the difference d1 between the width c1 of the central lens portion 101 and the width c2 of the surrounding lens portion 102 satisfies: d1 is less than or equal to 0.3 μm.

[0072] Illustratively, along the extension direction of the symmetry axis of the central lens portion 101, the width c1 of the central lens portion 101 is between 4μm and 4.5μm, for example, it may specifically include 4μm, 4.1μm, 4.15μm, 4.2μm, 4.25μm, 4.3μm, 4.37μm, 4.4μm, 4.5μm, but not limited to this.

[0073] Exemplarily, along the extension direction of the symmetry axis of the central lens portion 101, the width c2 of the surrounding lens portion 102 is between 4μm and 4.5μm, for example, it can specifically include 4μm, 4.1μm, 4.17μm, 4.2μm, 4.25μm, 4.3μm, 4.35μm, 4.4μm, 4.5μm, but not limited to this.

[0074] Exemplarily, along the extension direction of the symmetry axis of the central lens portion 101, the overall width c3 of the surrounding lens portion 102 is between 12μm and 12.5μm, for example: it can specifically include 12μm, 12.1μm, 12.15μm, 12.2μm, 12.25μm, 12.3μm, 12.37μm, 12.4μm, 12.5μm, but is not limited to this.

[0075] The above-mentioned setting method makes the concave width of the central lens part 101 and the concave width of the surrounding lens part 102 roughly the same, so that the central lens part 101 and the surrounding lens part 102 can achieve uniformity in lens morphology, thereby greatly improving the light extraction efficiency of the pixel opening area K1.

[0076] As shown in Figures 2 and 8 to 10, in some embodiments, the central lens portion 101 includes a first edge portion 1011, and the orthographic projection of the first edge portion 1011 on the substrate forms the first boundary J1; the surrounding lens portion 102 includes an outer edge portion 1021, and the orthographic projection of the outer edge portion 1021 on the substrate forms the outer boundary 102w; in a direction perpendicular to the substrate, a difference h1 between a height c4 of the first edge portion 1011 and a height c5 of the outer edge portion 1021 satisfies: h1 is less than or equal to 0.3 μm.

[0077] As shown in Figure 1, in some embodiments, the central lens portion 101 includes a first edge portion 1011, and the orthographic projection of the first edge portion 1011 on the substrate forms the first boundary J1; the surrounding lens portion 102 includes an outer edge portion 1021, and the orthographic projection of the outer edge portion 1021 on the substrate forms the outer boundary 102w; in a direction parallel to the substrate, the difference d2 between the width c6 of the first edge portion 1011 and the width c7 of the outer edge portion 1021 satisfies: d2 is less than or equal to 0.3 μm.

[0078] Illustratively, in a direction parallel to the base substrate, a difference d2 between the minimum width of the first edge portion 1011 and the minimum width of the outer edge portion 1021 satisfies: d2 is less than or equal to 0.3 μm.

[0079] Exemplarily, in a direction parallel to the base substrate, a difference d2 between the maximum width of the first edge portion 1011 and the maximum width of the outer edge portion 1021 satisfies: d2 is less than or equal to 0.3 μm.

[0080] Exemplarily, the portions of the first edge portion 1011 and the outer edge portion 1021 that have the same height in a direction perpendicular to the base substrate have approximately the same thickness in a direction parallel to the base substrate.

[0081] As shown in FIG10 , in some embodiments, in a direction perpendicular to the substrate, a difference h2 between a maximum depth c8 of the central lens portion 101 and a maximum depth c9 of the surrounding lens portion 102 satisfies: h2 is less than or equal to 0.3 μm.

[0082] Illustratively, the maximum depth of the central lens portion 101 refers to the maximum depth of the concave portion included in the central lens portion 101 . The maximum depth of the surrounding lens portion 102 refers to the maximum depth of the concave portion included in the surrounding lens portion 102 .

[0083] In the display substrate provided by the above embodiment, the lens is arranged to be formed into a nested structure including the central lens part 101 and the surrounding lens part 102; at the same time, the depth of the recess included in the central lens part 101 is arranged to be approximately the same as the depth of the recess included in the surrounding lens part 102; the first edge part 1011 included in the central lens part 101 and the outer edge part 1021 included in the surrounding lens part 102 are arranged to have approximately the same morphology, and the morphology here includes not only shape but also size, such as width along a certain direction, etc.; the maximum width of the recess of the central lens part 101 is arranged to be approximately the same as the maximum width of the recess of the surrounding lens part 102; the above arrangement enables the central lens part 101 and the surrounding lens part 102 to achieve uniformity in lens morphology, thereby greatly improving the light extraction efficiency of the pixel opening area K1.

[0084] As shown in Figures 1 and 12, in some embodiments, the central lens portion 101 includes a first edge portion 1011, the first edge portion 1011 includes alternating first edges 1011a and first corners 1011b, adjacent first edges 1011a and first corners 1011b are coupled, and the height of the first edges 1011a gradually decreases in a direction away from the first corner 1011b to which they are coupled.

[0085] Illustratively, the adjacent first side portions 1011a and first corner portions 1011b are formed into an integral structure.

[0086] Exemplarily, the orthographic projection of the first edge portion 1011 on the base substrate forms the first boundary J1, the first boundary J1 includes a regular hexagon, the orthographic projection of the first side portion 1011a on the base substrate forms the side of the regular hexagon, and the orthographic projection of the first corner portion 1011b on the base substrate forms the corner of the regular hexagon.

[0087] Illustratively, the boundary of the first side portion 1011a facing away from the substrate is arc-shaped, and the arc is bent toward the substrate, that is, the height of the first side portion 1011a gradually decreases in the direction away from the first corner portion 1011b coupled thereto.

[0088] Because the light-emitting functional layer EL is deposited thinner in areas with greater slope angles, the luminescence brightness of the light-emitting functional layer EL is brighter, while the light-emitting functional layer EL is deposited thicker in flatter areas, the luminescence brightness of the light-emitting functional layer EL is lower. This arrangement helps reduce the flatness of the surface of the first edge portion 1011a facing away from the base substrate, thereby increasing the luminescence brightness of the portion of the light-emitting functional layer EL covering the first edge portion 1011a, thereby improving the overall brightness of the display substrate.

[0089] As shown in Figures 1 and 12, in some embodiments, the surrounding lens portion 102 includes an outer edge portion 1021, and the outer edge portion 1021 includes alternating outer edge portions 1021a and outer corner portions 1021b, and the adjacent outer edge portions 1021a and the outer corner portions 1021b are coupled, and the height of the outer edge portion 1021a gradually decreases in a direction away from the outer corner portion 1021b to which it is coupled.

[0090] Illustratively, the adjacent outer edge portions 1021a and the outer corner portions 1021b are formed into an integral structure.

[0091] Exemplarily, the orthographic projection of the outer edge portion 1021 on the substrate forms the outer boundary 102w, and the outer boundary 102w includes a regular hexagon. The orthographic projection of the outer edge portion 1021a on the substrate forms the side of the regular hexagon, and the orthographic projection of the outer corner portion 1021b on the substrate forms the corner of the regular hexagon.

[0092] Illustratively, the boundary of the outer edge portion 1021a facing away from the substrate is arc-shaped, and the arc is bent toward the substrate, that is, the height of the outer edge portion 1021a gradually decreases in the direction away from the outer corner portion 1021b to which it is coupled.

[0093] Because the light-emitting functional layer EL is deposited thinner in areas with greater slope angles, the brightness of the light-emitting functional layer EL is brighter, while the light-emitting functional layer EL is deposited thicker in flatter areas, the brightness of the light-emitting functional layer EL is lower. This arrangement helps reduce the flatness of the surface of the outer edge portion 1021a facing away from the base substrate, thereby improving the brightness of the portion of the light-emitting functional layer EL covering the outer edge portion 1021a, thereby improving the overall brightness of the display substrate.

[0094] As shown in FIG. 2 and FIG. 12 , in some embodiments, in the lens unit 1 , a contact portion 30 is formed between three adjacent lenses, and a surface of the contact portion 30 facing away from the substrate forms a sharp corner 301 .

[0095] Exemplarily, the orthographic projection of the contact portion 30 on the base substrate includes a triangle, but is not limited thereto.

[0096] It should be noted that if the surface of the contact portion 30 facing away from the base substrate is flat, i.e., a flat area is formed, the light-emitting functional layer EL located in the platform area does not emit light or emits very low brightness. Therefore, the optimal morphology of the lens unit 1 is to have no platform area.

[0097] The contact portion 30 is arranged to form a sharp corner 301 on the surface facing away from the substrate, thereby avoiding the formation of the platform area, so that the portion of the light-emitting functional layer EL covering the contact portion 30 has a thinner thickness, thereby further improving the luminous brightness of the light-emitting functional layer EL.

[0098] The above-mentioned setting of the contact portion 30 facing away from the surface of the substrate to form the sharp corner 301 can be achieved by extending the etching process time, that is, in the process of etching to form the lens, after the lens is formed, the etching time is further extended to make the platform area disappear, thereby forming the contact portion 30 with the sharp corner 301.

[0099] In some embodiments, the display substrate further includes a pixel defining layer PDL, which defines the pixel opening area K1. In at least part of the lens unit 1, the orthographic projection of part of the lens located at the edge of the pixel opening area K1 on the base substrate at least partially overlaps with the orthographic projection of the pixel defining layer PDL on the base substrate.

[0100] Exemplarily, after forming the anode Ano, the pixel defining layer PDL is formed, and the pixel defining layer PDL can define a plurality of the pixel opening areas K1.

[0101] In the above-mentioned arrangement, in at least part of the lens unit 1, the orthographic projection of some lenses located at the edge of the pixel opening area K1 on the base substrate at least partially overlaps with the orthographic projection of the pixel definition layer PDL on the base substrate, so that the lens array included in the lens unit 1 can extend beyond the pixel opening area K1, ensuring a 100% lens filling rate within the pixel opening area K1, thereby improving the light extraction effect of the display substrate.

[0102] As shown in FIG. 4 , in some embodiments, the lens includes a first surrounding lens portion 102 and a second surrounding lens portion 102 , wherein the first surrounding lens portion 102 surrounds the central lens portion 101 , and the second surrounding lens portion 102 surrounds the first surrounding lens portion 102 .

[0103] Exemplarily, the lens may include at least two surrounding lens parts 102 , and the at least two surrounding lens parts 102 are nested in sequence.

[0104] Exemplarily, each of the surrounding lens portions 102 includes a recess, an inner edge portion of the recess close to the central lens portion 101 , and an outer edge portion 1021 of the recess away from the central lens portion 101 .

[0105] Exemplarily, the first edge portion 1011 included in the central lens portion 101 can be reused as the inner edge portion of the adjacent first surround lens portion 102. The outer edge portion 1021 of the first surround lens portion 102 is reused as the inner edge portion of the adjacent second surround lens portion 102.

[0106] As shown in Figure 6, exemplarily, when the lens includes multiple surrounding lens parts 102 and the multiple surrounding lens parts 102 are nested in sequence, among two adjacent surrounding lens parts 102, the outer edge part 1021 of the surrounding lens part 102 close to the central lens part 101 is reused as the inner edge part of the surrounding lens part 102 away from the central lens part 101.

[0107] In the display substrate provided by the above embodiment, the lenses are arranged to form a multi-layer nested lens structure, which further improves the light extraction efficiency of the display substrate.

[0108] In some embodiments, the multiple sub-pixels include a first color sub-pixel and a second color sub-pixel, the driving current corresponding to the first color sub-pixel is greater than the driving current corresponding to the second color sub-pixel, and the filling rate of the lens unit in the pixel opening area of ​​the first color sub-pixel is greater than the filling rate of the lens unit in the pixel opening area of ​​the second color sub-pixel.

[0109] Exemplarily, the multiple sub-pixels include red sub-pixels, green sub-pixels and blue sub-pixels, the driving current corresponding to the red sub-pixel is greater than the driving current corresponding to the green sub-pixel, and the driving current corresponding to the green sub-pixel is greater than the driving current corresponding to the blue sub-pixel; the filling rate of the lens unit in the pixel opening area of ​​the red sub-pixel is greater than the filling rate of the lens unit in the pixel opening area of ​​the green sub-pixel; the filling rate of the lens unit in the pixel opening area of ​​the green sub-pixel is greater than the filling rate of the lens unit in the pixel opening area of ​​the blue sub-pixel.

[0110] Exemplarily, the multiple sub-pixels also include a white sub-pixel, the driving current corresponding to the white sub-pixel is smaller than the driving current corresponding to the blue sub-pixel, and the filling rate of the lens unit in the pixel opening area of ​​the white sub-pixel is smaller than the filling rate of the lens unit in the pixel opening area of ​​the blue sub-pixel.

[0111] In the display substrate provided by the above embodiment, for sub-pixels with different drive currents, different lens fill rates can be set to compensate for differences in luminance caused by these differences in drive current. Therefore, in the display substrate provided by the above embodiment, when a single gamma voltage is used to drive sub-pixels of different colors, differences in luminance caused by differences in drive current can be effectively compensated.

[0112] In some embodiments, the plurality of sub-pixels include a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and a white sub-pixel W;

[0113] As shown in FIG13 and FIG14 , the pixel opening area K1 included in the white sub-pixel W is not filled with the lens unit 1; or,

[0114] As shown in FIG15 and FIG16 , the pixel opening area K1 included in at least one of the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is not filled with the lens unit 1; or,

[0115] As shown in FIG17 and FIG18 , the pixel opening area K1 included in the white sub-pixel W is not filled with the lens unit 1 , and the pixel opening area K1 included in at least one of the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is not filled with the lens unit 1 .

[0116] In the display substrate provided by the above embodiment, by setting different lens fill rates for sub-pixels of different colors, the difference in lifespan of sub-pixels of different colors can be compensated. It is worth noting that a high lens fill rate corresponding to a sub-pixel is conducive to improving the lifespan of the sub-pixel.

[0117] As shown in Figures 7 and 13 to 18, in some embodiments, the display substrate further includes a driving circuit layer 40 and a color filter layer CF. The driving circuit layer 40 is located on the side of the color filter layer CF facing the base substrate 70. The color filter layer CF is located on the side of the lens unit 1 facing the base substrate 70. The orthographic projection of the color filter layer CF on the base substrate 70 at least partially overlaps with the orthographic projection of the pixel opening area K1 on the base substrate 70.

[0118] Exemplarily, the color filter layer CF includes a plurality of red color filter patterns CF-R, a plurality of green color filter patterns CF-G and a plurality of blue color filter patterns CF-B, and the orthographic projections of the color filter patterns on the base substrate at least partially overlap with the orthographic projections of the pixel opening areas K1 of the corresponding sub-pixels on the base substrate.

[0119] It should be noted that the red sub-pixels, green sub-pixels and blue sub-pixels mentioned in the above embodiments can be the light-emitting functional layers EL included therein that directly emit light of the corresponding colors, or the light-emitting functional layers EL included in the sub-pixels of various colors can all emit white light, and the white light forms light of the corresponding color after passing through the color film pattern of the corresponding color.

[0120] Exemplarily, the driving circuit layer 40 includes a plurality of sub-pixel driving circuits distributed in an array, and the sub-pixel driving circuits include a 3T1C (i.e., 3 transistors and 1 capacitor) circuit structure, a 5T1C (i.e., 5 transistors and 1 capacitor) circuit structure, a 6T1C (i.e., 6 transistors and 1 capacitor) circuit structure, a 7T1C (i.e., 7 transistors and 1 capacitor) circuit structure, an 8T1C (i.e., 8 transistors and 1 capacitor) circuit structure, and a 9T1C (i.e., 9 transistors and 1 capacitor) circuit structure, but are not limited to these.

[0121] An embodiment of the present disclosure further provides a display device, comprising the display substrate provided by the above embodiment.

[0122] It should be noted that the display device can be any product or component with a display function, such as a television, a monitor, a digital photo frame, a mobile phone, a tablet computer, etc., wherein the display device also includes a flexible circuit board, a printed circuit board and a backplane.

[0123] Exemplarily, the display device includes a bottom-emitting OLED, but is not limited thereto.

[0124] In the display substrate provided by the above embodiment, a lens unit 1 is provided within the pixel opening area K1. The lens unit 1 includes a plurality of lenses distributed in an array, each lens including a central lens portion 101 and at least one surrounding lens portion 102, wherein the surrounding lens portion 102 surrounds the central lens portion 101. This arrangement forms the lens into a structure in which the central lens portion 101 nests the surrounding lens portion 102, so that each lens can form multiple recesses, which is equivalent to increasing the number of lenses included in the lens unit 1, thereby greatly improving the light extraction efficiency of the pixel opening area K1. Moreover, when laying out the lens unit 1 including the above lens structure, only the boundary matching between adjacent lenses needs to be considered, without considering the boundary matching between the central lens portion 101 and the surrounding lens portion 102 in each lens. Therefore, while achieving higher light extraction efficiency, the difficulty of lens layout will not be increased. In addition, in the display substrate provided by the above embodiment, the light extraction efficiency can be improved by changing the lens structure without increasing the power consumption of the sub-pixel driving circuit, thus being more conducive to saving the overall power consumption of the display substrate.

[0125] The display device provided by the embodiment of the present disclosure also has the above-mentioned beneficial effects when it includes the above-mentioned display substrate, which will not be described in detail here.

[0126] The present disclosure also provides a method for manufacturing a display substrate, which is used to manufacture the display substrate provided in the above embodiment. The display substrate includes: a base substrate and a plurality of sub-pixels arranged on the base substrate, wherein the sub-pixels include a pixel opening area K1; the display substrate also includes a plurality of lens units 1, wherein at least a portion of the lens units 1 is located within the corresponding pixel opening area K1; the manufacturing method includes the steps of manufacturing the lens units 1, which specifically include:

[0127] forming an organic material layer on a base substrate;

[0128] forming a photoresist layer on a side of the organic material layer facing away from the base substrate, and patterning the photoresist layer to form a photoresist pattern;

[0129] The organic material layer is etched using the photoresist pattern as a mask to form the lens unit 1. The lens unit 1 includes a plurality of lenses 10 distributed in an array. The lenses include a central lens portion 101 and at least one surrounding lens portion 102. The surrounding lens portion 102 surrounds the central lens portion 101.

[0130] In a display substrate manufactured using the manufacturing method provided by an embodiment of the present disclosure, a lens unit 1 is disposed within the pixel opening region K1. The lens unit 1 includes a plurality of lenses arranged in an array, each lens comprising a central lens portion 101 and at least one surrounding lens portion 102, with the surrounding lens portion 102 surrounding the central lens portion 101. This arrangement forms a structure in which the central lens portion 101 nests within the surrounding lens portion 102, enabling each lens to form multiple recesses. This effectively increases the number of lenses included in the lens unit 1, thereby maximizing light extraction efficiency within the pixel opening region K1.

[0131] Moreover, in the display substrate manufactured using the manufacturing method provided by the embodiment of the present disclosure, it is only necessary to consider the boundary matching between adjacent lenses, without considering the boundary matching between the central lens portion 101 and the surrounding lens portion 102 in each lens. Therefore, while achieving higher light extraction efficiency, the difficulty of lens layout will not be increased.

[0132] In addition, in the display substrate manufactured using the manufacturing method provided by the embodiment of the present disclosure, the light extraction efficiency can be improved by changing the structure of the lens without increasing the power consumption of the sub-pixel driving circuit. Therefore, it is more conducive to saving the overall power consumption of the display substrate.

[0133] In addition, in the display substrate manufactured using the manufacturing method provided by the embodiment of the present disclosure, the lens units 1 corresponding to each pixel opening area K1 are manufactured at the same time, ensuring the consistency of the morphology of the lens units 1 in each pixel opening area K1, and at the same time ensuring that the size and nesting number of each lens remain consistent, thereby better improving the uniformity.

[0134] In some embodiments, the step of etching the organic material layer using the photoresist pattern as a mask specifically includes:

[0135] After the lens unit 1 is formed by etching, the etching time is extended. In the lens unit 1 , contact portions 30 are formed between three adjacent lenses. The surface of the contact portion 30 facing away from the substrate forms a sharp corner 301 .

[0136] In the manufacturing method provided in the above embodiment, during the process of etching to form the lens, after the lens is formed, the etching time is further prolonged to make the platform area disappear, thereby forming the contact portion 30 with a sharp corner 301 .

[0137] The contact portion 30 is arranged to form a sharp corner 301 on the surface facing away from the substrate, thereby avoiding the formation of the platform area, so that the portion of the light-emitting functional layer EL covering the contact portion 30 has a thinner thickness, thereby further improving the luminous brightness of the light-emitting functional layer EL.

[0138] In the various method embodiments of the present disclosure, the serial numbers of the steps cannot be used to limit the order of the steps. For ordinary technicians in this field, without paying any creative work, changes to the order of the steps are also within the scope of protection of the present disclosure.

[0139] It should be noted that the "same layer" in the embodiment of the present disclosure may refer to a film layer on the same structural layer. Or, for example, a film layer in the same layer may be a film layer formed by using the same film forming process to form a specific pattern, and then patterning the film layer using the same mask through a single composition process to form a layer structure. Depending on the specific pattern, a single composition process may include multiple exposure, development or etching processes, and the specific pattern in the formed layer structure may be continuous or discontinuous. These specific patterns may also be at different heights or have different thicknesses.

[0140] It should be noted that the various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences from other embodiments. In particular, the method embodiments are described briefly because they are generally similar to the product embodiments. For relevant parts, refer to the description of the product embodiments.

[0141] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect", "couple" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0142] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “under” another element, it can be “directly on” or “under” the other element or intervening elements may be present.

[0143] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0144] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A display substrate, comprising: A substrate and a plurality of sub-pixels disposed on the substrate, the sub-pixels including pixel opening regions; the display substrate further includes a plurality of lens units, and at least a part of the lens units is located in the corresponding pixel opening regions; The lens unit includes a plurality of lenses arranged in an array, the lens includes a central lens portion and at least one surrounding lens portion, and the surrounding lens portion surrounds the central lens portion.

2. The display substrate according to claim 1, wherein, The orthographic projection of the central lens portion on the substrate has a first boundary, and the orthographic projection of the surrounding lens portion on the substrate has an outer boundary away from the central lens portion, and the shape of the outer boundary is the same as the shape of the first boundary.

3. The display substrate according to claim 2, wherein, Along the extension direction of the axis of symmetry of the central lens portion, the difference d1 between the width of the central lens portion and the width of the surrounding lens portion satisfies: d1 is less than or equal to 0.3 μm.

4. The display substrate according to claim 2, wherein, The central lens portion includes a first edge portion, and the orthographic projection of the first edge portion on the substrate forms the first boundary; the surrounding lens portion includes an outer edge portion, and the orthographic projection of the outer edge portion on the substrate forms the outer boundary; in the direction perpendicular to the substrate, the difference h1 between the height of the first edge portion and the height of the outer edge portion satisfies: h1 is less than or equal to 0.3 μm.

5. The display substrate according to claim 2, wherein, The central lens portion includes a first edge portion, and the orthographic projection of the first edge portion on the substrate forms the first boundary; the surrounding lens portion includes an outer edge portion, and the orthographic projection of the outer edge portion on the substrate forms the outer boundary; in the direction parallel to the substrate, the difference d2 between the width of the first edge portion and the width of the outer edge portion satisfies: d2 is less than or equal to 0.3 μm.

6. The display substrate according to claim 2, wherein, In the direction perpendicular to the substrate, the difference h2 between the maximum depth of the central lens portion and the maximum depth of the surrounding lens portion satisfies: h2 is less than or equal to 0.3 μm.

7. The display substrate according to claim 2, wherein, The shape of the outer boundary includes a regular hexagon.

8. The display substrate according to claim 1, wherein, The central lens portion includes a first edge portion, the first edge portion includes alternately arranged first side portions and first corner portions, adjacent first side portions and first corner portions are coupled, and in the direction away from the first corner portion to which it is coupled, the height of the first side portion gradually decreases.

9. The display substrate according to claim 1, wherein, The surrounding lens portion includes an outer edge portion, the outer edge portion includes alternately arranged outer side portions and outer corner portions, adjacent outer side portions and outer corner portions are coupled, and in the direction away from the outer corner portion to which it is coupled, the height of the outer side portion gradually decreases.

10. The display substrate according to claim 1, wherein, In the lens unit, a contact portion is formed between three adjacent lenses, and a sharp angle is formed on the surface of the contact portion facing away from the substrate.

11. The display substrate according to claim 1, wherein, The display substrate further includes a pixel defining layer that defines the pixel opening regions, and in at least a part of the lens units, the orthographic projection of the part of the lens located at the edge of the pixel opening region on the substrate at least partially overlaps with the orthographic projection of the pixel defining layer on the substrate.

12. The display substrate according to claim 1, wherein, The lens includes a first surrounding lens portion and a second surrounding lens portion. The first surrounding lens portion surrounds the central lens portion, and the second surrounding lens portion surrounds the first surrounding lens portion.

13. The display substrate according to any one of claims 1 to 12, wherein, The multiple sub-pixels include a first color sub-pixel and a second color sub-pixel. The driving current corresponding to the first color sub-pixel is greater than the driving current corresponding to the second color sub-pixel. The filling rate of the lens unit in the pixel opening area of the first color sub-pixel is greater than the filling rate of the lens unit in the pixel opening area of the second color sub-pixel.

14. The display substrate according to claim 13, wherein, The multiple sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The driving current corresponding to the red sub-pixel is greater than the driving current corresponding to the green sub-pixel, and the driving current corresponding to the green sub-pixel is greater than the driving current corresponding to the blue sub-pixel. The filling rate of the lens unit in the pixel opening area of the red sub-pixel is greater than the filling rate of the lens unit in the pixel opening area of the green sub-pixel; the filling rate of the lens unit in the pixel opening area of the green sub-pixel is greater than the filling rate of the lens unit in the pixel opening area of the blue sub-pixel. Unit filling rate.

15. The display substrate according to claim 14, wherein, The multiple sub-pixels further include a white sub-pixel. The driving current corresponding to the white sub-pixel is less than the driving current corresponding to the blue sub-pixel. The filling rate of the lens unit in the pixel opening area of the white sub-pixel is less than the filling rate of the lens unit in the pixel opening area of the blue sub-pixel.

16. The display substrate according to any one of claims 1 to 12, wherein, The multiple sub-pixels include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. The pixel opening area included in the white sub-pixel does not fill the lens unit; or, At least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel includes a pixel opening area that does not fill the lens unit; or, The pixel opening area included in the white sub-pixel does not fill the lens unit, and at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel includes a pixel opening area that does not fill the lens unit.

17. The display substrate according to claim 1, wherein, The display substrate further includes a driving circuit layer and a color filter layer. The driving circuit layer is located on the side of the color filter layer facing the substrate, and the color filter layer is located on the side of the lens unit facing the substrate. The orthographic projection of the color filter layer on the substrate at least partially overlaps with the orthographic projection of the pixel opening area on the substrate.

18. A display device, comprising the display substrate according to any one of claims 1 to 17.

19. A manufacturing method of a display substrate for manufacturing the display substrate according to any one of claims 1 to 17, the display substrate comprising: A substrate and multiple sub-pixels provided on the substrate. The sub-pixels include pixel opening areas; the display substrate further includes multiple lens units, and at least a part of the lens units is located in the corresponding pixel opening areas; the manufacturing method includes the step of manufacturing the lens units, and this step specifically includes: Form an organic material layer on the substrate. Form a photoresist layer on the side of the organic material layer facing away from the substrate, pattern the photoresist layer to form a photoresist pattern. Using the photoresist pattern as a mask, etching the organic material layer to form the lens unit, the lens unit includes a plurality of lenses arranged in an array, and the lens includes a central lens portion and at least one surrounding lens portion, and the surrounding lens portion surrounds the central lens portion.

20. The manufacturing method of the display substrate according to claim 19, wherein, The step of etching the organic material layer using the photoresist pattern as a mask specifically includes: After etching to form the lens unit, extending the etching time to form a contact portion between three adjacent lenses in the lens unit, and a sharp angle is formed on the surface of the contact portion facing away from the substrate.

Images