Display substrate, preparation method thereof and display device

Abstract

The invention provides a display substrate, a preparation method thereof and a display device. The display substrate comprises a first sub-pixel area (41) and a first non-sub-pixel area (51) located on the periphery of the first sub-pixel area (41). The display substrate comprises a color filtering structure layer (106) arranged on a substrate (101). The color filtering structure layer (106) comprises a first color filtering pattern (21) arranged on the substrate (101), and the first color filtering pattern (21) is located in a first sub-pixel area (41). The first light blocking pattern (31) and the second light blocking pattern (32) are arranged on the substrate (101) and are different in color, and the first light blocking pattern (31) and the second light blocking pattern (32) are both located in the first non-sub-pixel area (51); the second light blocking pattern (32) is arranged on the side, away from the substrate (101), of the first light blocking pattern (31), and at least part of the orthographic projection of the second light blocking pattern (32) and the orthographic projection of the first light blocking pattern (31) on the substrate (101) are overlapped; and at least part of the material of the first color filter pattern (21) extends to the first non-sub-pixel region (51) to form the second light blocking pattern (32).

Description

Display substrate, preparation method thereof and display device TECHNICAL FIELD

[0001] The present disclosure relates to, but is not limited to, the technical field of display, in particular to a display substrate, a preparation method thereof and a display device. BACKGROUND

[0002] Organic Light Emitting Diode (OLED) and Quantum-dot Light Emitting Diodes (QLED) are active light-emitting display devices, which have the advantages of self-luminous, wide viewing angle, high contrast, low power consumption, extremely high response speed, lightness, flexibility, low cost, etc. With the continuous development of display technology, flexible display devices with OLED or QLED as light-emitting devices and controlled by Thin Film Transistor (TFT) have become the mainstream products in the current display field.

[0003] SUMMARY

[0004] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0005] In one aspect, the present disclosure provides a display substrate, comprising a first sub-pixel region, and a first non-sub-pixel region located around the first sub-pixel region.

[0006] The display substrate comprises a color filter structure layer disposed on a substrate:

[0007] The color filter structure layer comprises:

[0008] a first color filter pattern disposed on the substrate, the first color filter pattern being located in the first sub-pixel region;

[0009] two first and second light-blocking patterns of different colors disposed on the substrate, the first and second light-blocking patterns being located in the first non-sub-pixel region;

[0010] The second light-blocking pattern is disposed on a side of the first light-blocking pattern away from the substrate, and at least part of the second light-blocking pattern overlaps with the first light-blocking pattern in orthographic projection on the substrate.

[0011] At least part of the material of the first color filter pattern extends to the first non-sub-pixel region to form the second light-blocking pattern.

[0012] In an exemplary embodiment, a normal projection of the second light-blocking pattern on the substrate covers a normal projection of the first light-blocking pattern on the substrate.

[0013] In an exemplary embodiment, the first color filter pattern and the second light-blocking pattern are both red color filters, and the first light-blocking pattern is a blue color filter.

[0014] In an exemplary embodiment, a second sub-pixel region and a second non-sub-pixel region surrounding the second sub-pixel region are further included.

[0015] The color filter structure layer further includes:

[0016] A second color filter pattern disposed on the substrate, the second color filter pattern being located in the second sub-pixel region.

[0017] Two third light-blocking patterns and fourth light-blocking patterns of different colors are disposed on the substrate, the third light-blocking patterns and the fourth light-blocking patterns being located in the second non-sub-pixel region.

[0018] The fourth light-blocking pattern is disposed on a side of the third light-blocking pattern away from the substrate, and at least part of the fourth light-blocking pattern overlaps a normal projection of the third light-blocking pattern on the substrate.

[0019] At least part of the material of the second color filter pattern extends to the second non-sub-pixel region to form the third light-blocking pattern.

[0020] In an exemplary embodiment, the second color filter pattern is adjacent to the first color filter pattern, and at least part of the material of the first color filter pattern extends to the second non-sub-pixel region to form the fourth light-blocking pattern in a region between the second color filter pattern and the first color filter pattern.

[0021] In an exemplary embodiment, a maximum thickness of the material of the first color filter pattern is h1, a maximum thickness of the material of the second color filter pattern is h2, and the h1 and the h2 satisfy the following relationship: h1>h2.

[0022] In an exemplary embodiment, a color conversion structure layer is further included on the substrate, the color conversion structure layer is disposed on the color filter structure layer close to the substrate, the color conversion structure layer includes at least one second pattern, the at least one second pattern is located in the second sub-pixel region and overlaps with the normal projection of the second color filter pattern on the substrate, the second pattern includes an upper surface close to the color filter structure layer and a lower surface away from the color filter structure layer, the maximum length of the upper surface and the lower surface in the direction parallel to the substrate is substantially equal, the maximum width of the overlapping area of the fourth light blocking pattern and the third light blocking pattern in the direction perpendicular to the substrate is WRB, the maximum length of the second sub-pixel region in the direction parallel to the substrate is d0, the maximum length of the material of the second color filter pattern in the direction parallel to the substrate is d2, and the WRB, the d2 and the d0 satisfy the following relationship: (d2-d0) / 3≤WRB≤(d2-d0) / 2.

[0023] In an exemplary embodiment, a color conversion structure layer is further included on the substrate, the color conversion structure layer is disposed on the color filter structure layer close to the substrate, the color conversion structure layer includes at least one second pattern, the at least one second pattern is located in the second sub-pixel region and overlaps with the normal projection of the second color filter pattern on the substrate, the second pattern includes an upper surface close to the color filter structure layer and a lower surface away from the color filter structure layer, the maximum length of the upper surface and the lower surface in the direction parallel to the substrate is substantially equal, the maximum width of the overlapping area of the fourth light blocking pattern and the third light blocking pattern in the direction perpendicular to the substrate is WRB, the maximum length of the second sub-pixel region in the direction parallel to the substrate is d0, the maximum length of the material of the second color filter pattern in the direction parallel to the substrate is d2, and the WRB, the d2 and the d0 satisfy the following relationship: (d2-d0) / 3≤WRB≤(d2-d0) / 2.

[0024] In an exemplary embodiment, the second color filter pattern and the first light blocking pattern are located in the same film layer and include the same color filter material.

[0025] In an exemplary embodiment, the second color filter pattern and the third light blocking pattern are both blue color filters, and the fourth light blocking pattern is a red color filter.

[0026] In an exemplary embodiment, a third sub-pixel region and a third non-sub-pixel region located around the third sub-pixel region are further included.

[0027] The color filter structure layer further includes:

[0028] a third color filter pattern disposed on the substrate, the third color filter pattern being located in the third sub-pixel region;

[0029] a fifth light-blocking pattern and a sixth light-blocking pattern of two different colors disposed on the substrate, the fifth light-blocking pattern and the sixth light-blocking pattern being located in the third non-sub-pixel region;

[0030] the sixth light-blocking pattern is disposed on a side of the fifth light-blocking pattern away from the substrate, and at least part of the sixth light-blocking pattern overlaps with a normal projection of the fifth light-blocking pattern on the substrate;

[0031] at least part of the material of the third color filter pattern extends to the third non-sub-pixel region, forming the fifth light-blocking pattern.

[0032] In an exemplary embodiment, the third color filter pattern is adjacent to the second color filter pattern, the sixth light-blocking pattern and the fourth light-blocking pattern in the region between the second color filter pattern and the third color filter pattern are in an integrated structure, the integrated structure is in the same film layer as the first color filter pattern, and uses the same material.

[0033] In an exemplary embodiment, a maximum width of the region where the fourth light-blocking pattern and the third light-blocking pattern overlap in a direction parallel to the substrate is W1, a maximum length of the second sub-pixel region in a direction parallel to the substrate is d0, a maximum length of the material of the second color filter pattern in a direction parallel to the substrate is d2, and the W1, the d2, and the d0 satisfy the following relationship: W1≤(d2-d0) / 2.

[0034] In an exemplary embodiment, a maximum width of the region where the sixth light-blocking pattern and the fifth light-blocking pattern overlap in a direction parallel to the substrate is W2, a maximum length of the third sub-pixel region in a direction parallel to the substrate is d4, a maximum length of the material of the third color filter pattern in a direction parallel to the substrate is d3, and the W2, the d3, and the d4 satisfy the following relationship: W2≤(d3-d4) / 2.

[0035] In an exemplary embodiment, a color conversion structure layer is further included on the substrate, the color conversion structure layer is disposed on the color filter structure layer close to the substrate, the color conversion structure layer includes at least one third pattern, the at least one third pattern is located in the third sub-pixel region and overlaps with the third color filter pattern in the orthographic projection on the substrate, the third pattern includes an upper surface close to the color filter structure layer and a lower surface away from the color filter structure layer, the maximum length of the upper surface and the lower surface in the direction parallel to the substrate is substantially equal, the maximum width of the overlapping area of the sixth light blocking pattern and the fifth light blocking pattern in the area between the third sub-pixel region and the first sub-pixel region in the direction parallel to the substrate is WRG, the maximum length of the third sub-pixel region in the direction parallel to the substrate is d4, the maximum length of the material of the third color filter pattern in the direction parallel to the substrate is d3, and the WRG, the d3 and the d4 satisfy the following relationship: (d3-d4) / 3≤WRG≤(d3-d4) / 2.

[0036] In an exemplary embodiment, a color conversion structure layer is further included on the substrate, the color conversion structure layer is disposed on the color filter structure layer close to the substrate, the color conversion structure layer includes at least one third pattern, the at least one third pattern is located in the third sub-pixel region and overlaps with the third color filter pattern in the orthographic projection on the substrate, the third pattern includes an upper surface close to the color filter structure layer and a lower surface away from the color filter structure layer, the maximum length of the upper surface in the direction parallel to the substrate is L3, which is greater than the maximum length of the lower surface in the direction parallel to the substrate, L4, the maximum width of the overlapping area of the sixth light blocking pattern and the fifth light blocking pattern in the area between the third sub-pixel region and the first sub-pixel region in the direction parallel to the substrate is WRG, the maximum length of the material of the third color filter pattern in the direction parallel to the substrate is d3, and the WRG, the d3, the L3 and the L4 satisfy the following relationship: (d3-L3) / 2≤WRG≤(d3-L4) / 2.

[0037] In an exemplary embodiment, the sixth light blocking pattern and the fourth light blocking pattern in the area between the third color filter pattern and the second color filter pattern are an integral structure.

[0038] In an exemplary embodiment, the maximum thickness of the integral structure is h4, the maximum thickness of the material of the first color filter pattern is h1, the maximum thickness of the material of the second color filter pattern is h2, and the h1, the h2 and the h4 satisfy the following relationship: h1>h4≥h2.

[0039] In an exemplary embodiment, the third color filter pattern is adjacent to the first color filter pattern, and material of at least part of the first color filter pattern extends to the third non-sub-pixel region, forming the sixth light-blocking pattern in an area between the third color filter pattern and the first color filter pattern.

[0040] In an exemplary embodiment, the third color filter pattern and the fifth light-blocking pattern are both green color filters.

[0041] In an exemplary embodiment, the display substrate further comprises a second sub-pixel region and a third sub-pixel region, the second sub-pixel region is provided with a second color filter pattern, and the third sub-pixel region is provided with a third color filter pattern, a maximum length of material of the first color filter pattern in a direction parallel to the substrate is d1, a maximum length of material of the second color filter pattern in a direction parallel to the substrate is d2, and a maximum length of material of the third color filter pattern in a direction parallel to the substrate is d3, and the d1, the d2, and the d3 satisfy the following relationship: d1>d3≥d2.

[0042] In an exemplary embodiment, the display substrate further comprises a second sub-pixel region and a third sub-pixel region, a minimum distance between edges of adjacent first sub-pixel regions in a direction parallel to the substrate is S1, a minimum distance between an edge of the first sub-pixel region and an edge of an adjacent third sub-pixel region in a direction parallel to the substrate is S2, and a minimum distance between an edge of the first sub-pixel region and an edge of an adjacent second sub-pixel region in a direction parallel to the substrate is S3, and the S1, the S2, and the S3 are different from each other.

[0043] In another aspect, the present disclosure further provides a display device comprising any of the display substrates described above.

[0044] In another aspect, the present disclosure further provides a method for manufacturing a display substrate, the display substrate comprising a first sub-pixel region and a first non-sub-pixel region around the first sub-pixel region, the method comprising:

[0045] forming a first light-blocking pattern on the substrate, the first light-blocking pattern being located in the first non-sub-pixel region;

[0046] forming a first color filter pattern on the substrate, the first color filter pattern being located in the first sub-pixel region, material of at least part of the first color filter pattern extending to the first non-sub-pixel region, forming a second light-blocking pattern, the second light-blocking pattern being different in color from the first light-blocking pattern, the second light-blocking pattern being located on a side of the first light-blocking pattern away from the substrate, and at least part of the second light-blocking pattern overlapping a projection of the first light-blocking pattern on the substrate.

[0047] Other aspects can become apparent from the following detailed description, when considered in conjunction with the accompanying drawings.

[0048] SUMMARY

[0049] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of this specification that is included to illustrate the present application and to explain the principles of the present application. The drawings provided herein are used to provide an overall understanding of the present application, and are not intended to be used to limit the scope of the present application.

[0050] Fig. 1 is a schematic diagram of a planar structure of a display substrate according to an embodiment of the present application;

[0051] Fig. 2 is a schematic diagram of a cross-sectional structure of a display substrate according to an embodiment of the present application;

[0052] Fig. 3a is a schematic diagram of a cross-sectional structure of a display substrate according to an embodiment of the present application;

[0053] Fig. 3b is a schematic diagram of a cross-sectional structure of a display substrate according to an embodiment of the present application;

[0054] Fig. 4a and Fig. 4b are schematic diagrams of a display substrate during preparation according to an embodiment of the present application;

[0055] Fig. 5a and Fig. 5b are schematic diagrams of a display substrate during preparation according to an embodiment of the present application;

[0056] Fig. 6a and Fig. 6b are schematic diagrams of a display substrate during preparation according to an embodiment of the present application;

[0057] Fig. 7 is a graph of red filter, green filter and blue light intensity;

[0058] Fig. 8 is a schematic diagram of a planar structure of a display substrate according to an embodiment of the present application.

[0059] DETAILED DESCRIPTION

[0060] In order to make the objects, technical solutions and advantages of the present disclosure clearer, below the embodiments of the present disclosure will be described in detail with reference to the drawings. It should be noted that the embodiments can be implemented in a variety of different forms. One skilled in the art can easily understand that the means and content can be changed into various forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the content described in the following embodiments. The embodiments in the present disclosure and the features in the embodiments can be combined with each other as long as there is no conflict.

[0061] In the drawings, the size, the thickness, or the region of each component is sometimes exaggerated, and sometimes shrunk for clarity. Therefore, one embodiment of the present disclosure is not necessarily limited to such a scale. The drawings are schematic views showing ideal examples, and the present disclosure is not limited to shapes or values shown in the drawings.

[0062] In this specification, ordinal numbers such as "first", "second", and "third" are used to avoid confusion among components, and are not used to limit the number in the specification.

[0063] In this specification, terms of "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like that indicate the orientation or positional relationship are used to describe the positional relationship of components with reference to the drawings, for the convenience of this specification and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present disclosure. The positional relationship of the components is appropriately changed according to the direction in which each component is described. Therefore, it is not limited to the words described in the specification, and can be appropriately changed depending on the situation.

[0064] In this specification, unless explicitly stated and limited otherwise, the terms "mount", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or connected; it can be directly connected, or indirectly connected through an intermediate piece, or communication between two elements. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art according to the specific circumstances.

[0065] In this specification, a transistor refers to an element including at least three terminals of a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between the drain electrode (drain electrode terminal, drain region, or drain electrode) and the source electrode (source electrode terminal, source region, or source electrode), and current can flow through the drain electrode, the channel region, and the source electrode. Note that in this specification, the channel region refers to a region where current mainly flows.

[0066] In this specification, the first electrode can be a drain electrode, and the second electrode can be a source electrode, or the first electrode can be a source electrode, and the second electrode can be a drain electrode. In the case of using a transistor with opposite polarity or in the case of changing the direction of current in the circuit operation, the functions of "source electrode" and "drain electrode" are sometimes exchanged with each other. Therefore, in this specification, "source electrode" and "drain electrode" can be exchanged with each other.

[0067] In the present specification, "connection" includes a case where components are connected together through an element having some electrical action. The element having some electrical action is not particularly limited as long as it can perform transmission and reception of an electrical signal between the components to be connected. Examples of the element having some electrical action include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, and another element having various functions.

[0068] In the present specification, "parallel" means a state where an angle formed by two straight lines is -10° or more and 10° or less, and thus, a state where the angle is -5° or more and 5° or less is also included. In addition, "perpendicular" means a state where an angle formed by two straight lines is 80° or more and 100° or less, and thus, a state where the angle is 85° or more and 95° or less is also included.

[0069] In the present specification, "film" and "layer" can be replaced with each other. For example, "a conductive layer" can be replaced with "a conductive film". Similarly, "an insulating film" can be replaced with "an insulating layer".

[0070] In the present disclosure, "about" means not strictly limited to a boundary, allowing a range of values within process and measurement errors.

[0071] The display substrate provided by the embodiment of the present disclosure includes a first sub-pixel region and a first non-sub-pixel region located around the first sub-pixel region.

[0072] The display substrate includes a color filter structure layer disposed on a substrate:

[0073] The color filter structure layer includes:

[0074] A first color filter pattern disposed on the substrate, the first color filter pattern being located in the first sub-pixel region;

[0075] A first light-blocking pattern and a second light-blocking pattern of two different colors disposed on the substrate, the first light-blocking pattern and the second light-blocking pattern being located in the first non-sub-pixel region;

[0076] The second light-blocking pattern is disposed on a side of the first light-blocking pattern away from the substrate, and at least part of the second light-blocking pattern overlaps with a projection of the first light-blocking pattern on the substrate.

[0077] At least part of the material of the first color filter pattern extends to the first non-sub-pixel region to form the second light-blocking pattern.

[0078] The scheme of the embodiment is exemplified below by some examples.

[0079] FIG. 1 is a schematic diagram of a planar structure of a display substrate according to an embodiment of the present application; and FIG. 2 is a schematic diagram of a cross-sectional structure of the display substrate according to an embodiment of the present application. FIG. 2 can be a cross-sectional view along the direction of A-A' in FIG. 1. In an exemplary embodiment, as shown in FIGS. 1 and 2, in a direction parallel to the display substrate, the display substrate according to an embodiment of the present application includes a first sub-pixel region 41 and a first non-sub-pixel region 51 surrounding the first sub-pixel region 41, a second sub-pixel region 42 and a second non-sub-pixel region 52 surrounding the second sub-pixel region 42, and a third sub-pixel region 43 and a third non-sub-pixel region 53 surrounding the third sub-pixel region 43. The second sub-pixel region 42, the first sub-pixel region 41, and the third sub-pixel region 43 are arranged at intervals along a first direction D1.

[0080] In an exemplary embodiment, the first sub-pixel region 41 can emit light of a first color, the second sub-pixel region 42 can emit light of a second color, and the third sub-pixel region 43 can emit light of a third color. For example, the first sub-pixel region 41 can be a red light-emitting device (R) that emits red light, the second sub-pixel region 42 can be a blue light-emitting device (B) that emits blue light, and the third sub-pixel region 43 can be a green light-emitting device (G) that emits green light.

[0081] In an exemplary embodiment, the second sub-pixel region 42, the first sub-pixel region 41, and the third sub-pixel region 43 can be arranged at intervals along the first direction D1 to form a pixel unit, and a plurality of pixel units can be arranged at intervals along a second direction D2. The first direction D1 and the second direction D2 are both parallel to the substrate 101, and the first direction D1 and the second direction D2 intersect with each other, for example, the first direction D1 and the second direction D2 are perpendicular to each other.

[0082] In some embodiments, the second sub-pixel region, the first sub-pixel region, and the third sub-pixel region can be arranged at intervals along the second direction D2, or the second sub-pixel region, the first sub-pixel region, and the third sub-pixel region can be arranged in a triangular manner, which is not limited in the present disclosure.

[0083] In an exemplary embodiment, in a direction perpendicular to the display substrate, the display substrate according to an embodiment of the present application includes a driving circuit layer 102 disposed on a substrate 101, a light-emitting structure layer 103 disposed on a side of the driving circuit layer 102 away from the substrate 101, an encapsulation structure layer 104 disposed on a side of the light-emitting structure layer 103 away from the substrate 101, a color conversion structure layer 105 disposed on a side of the encapsulation structure layer 104 away from the substrate 101, and a color filter structure layer 106 disposed on a side of the color conversion structure layer 105 away from the substrate 101. In some possible implementations, the display substrate can include other film layers, such as a touch structure layer, which is not limited in the present disclosure.

[0084] In the example embodiment, the substrate 101 can be a flexible substrate or a rigid substrate. The driving circuit layer 102 can include a pixel driving circuit, which can include a plurality of transistors and a storage capacitor. The light-emitting structure layer 103 can include a plurality of light-emitting devices, which can include an anode, an organic light-emitting layer, and a cathode, the anode being connected to the pixel driving circuit, the organic light-emitting layer being connected to the anode, and the cathode being connected to the organic light-emitting layer, the organic light-emitting layer emitting light under the driving of the anode and the cathode. The encapsulation structure layer 104 can include a first encapsulation layer, a second encapsulation layer, and a third encapsulation layer stacked together, the first encapsulation layer and the third encapsulation layer can be made of inorganic materials, and the second encapsulation layer can be made of an organic material, the second encapsulation layer being arranged between the first encapsulation layer and the third encapsulation layer to form an inorganic material / organic material / inorganic material stacked structure, which can prevent external water vapor from entering the light-emitting structure layer 103.

[0085] In the example embodiment, the light-emitting device can include one of an organic light-emitting diode (OLED), a micro light-emitting diode (LED), and a quantum dot light-emitting diode (QLED).

[0086] In the example embodiment, the organic light-emitting layer can include an emission layer (EML) and any one or more of a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL).

[0087] In the example embodiment, the color conversion structure layer 105 includes a first pattern 11, a second pattern 12, a third pattern 13, and a boundary layer 14 between adjacent patterns of the first pattern 11, the second pattern 12, and the third pattern 13. The second pattern 12 is located in the second sub-pixel area 42, the first pattern 11 is located in the first sub-pixel area 41, the third pattern 13 is located in the third sub-pixel area 43, and the boundary layer 14 is located in the non-sub-pixel area. At least one of the first pattern 11, the second pattern 12, and the third pattern 13 is a quantum dot color conversion pattern configured to convert light emitted by the light-emitting device to a specific color.

[0088] In the example embodiment, when the light-emitting device is a blue OLED light-emitting device, the first pattern 11 is a red quantum dot color conversion pattern that can convert blue light emitted by the light-emitting device to red light emission, the second pattern 12 is a transmission pattern with a visible light transmission rate greater than 90%, and the third pattern 13 is a green quantum dot color conversion pattern that can convert blue light emitted by the light-emitting device to green light emission.

[0089] In some embodiments, when the light-emitting device is a white OLED light-emitting device, the first pattern 11 is a red quantum dot color conversion pattern, the red quantum dot color conversion pattern can convert the white light emitted by the light-emitting device into red light emission; the second pattern 12 is a blue quantum dot color conversion pattern, the blue quantum dot color conversion pattern can convert the white light emitted by the light-emitting device into blue light emission; the third pattern 13 is a green quantum dot color conversion pattern, the green quantum dot color conversion pattern can convert the white light emitted by the light-emitting device into green light emission.

[0090] In the example embodiment, the color filter structure layer 16 includes the second color filter pattern 22, the first color filter pattern 21 and the third color filter pattern 23 arranged along the direction parallel to the substrate 101. The first color filter pattern 21 is located in the first sub-pixel area 41, and the first color filter pattern 21 and the first pattern 11 have an overlapping projection on the substrate. For example, the first color filter pattern 21 and the first pattern 11 have a complete overlapping projection on the substrate. The first color filter pattern 21 can be used to realize the first color light emission, and the color of the light emitted by the first color filter pattern 21 is the same as the color of the light emitted by the first pattern 11. For example, the first color filter pattern 21 and the first pattern 11 can both realize red light emission. The second color filter pattern 22 is located in the second sub-pixel area 42, and the second color filter pattern 22 and the second pattern 12 have an overlapping projection on the substrate. For example, the second color filter pattern 22 and the second pattern 12 have a complete overlapping projection on the substrate. The second color filter pattern 22 can be used to realize the second color light emission, and the color of the light emitted by the second color filter pattern 22 is the same as the color of the light emitted by the second pattern 12. For example, the second color filter pattern 22 and the second pattern 12 can both realize blue light emission. The third color filter pattern 23 is located in the third sub-pixel area 43, and the third color filter pattern 23 and the third pattern 13 have an overlapping projection on the substrate. For example, the third color filter pattern 23 and the third pattern 13 have a complete overlapping projection on the substrate. The third color filter pattern 23 can be used to realize the third color light emission, and the color of the light emitted by the third color filter pattern 23 is the same as the color of the light emitted by the third pattern 13. For example, the third color filter pattern 23 and the third pattern 13 can both realize green light emission.

[0091] In the example embodiment, the color filter structure layer 16 further comprises a first light-blocking pattern 31 and a second light-blocking pattern 32 of two different colors and overlapping each other, both of which are located in the first non-sub-pixel region 51 and arranged around the periphery of the first color filter pattern 21. The overlapping region of the first light-blocking pattern 31 and the second light-blocking pattern 32 is a light-blocking region, which can prevent the first color filter pattern 21 from mixing with the light emitted by the adjacent color filter pattern.

[0092] In the example embodiment, at least part of the first light-blocking pattern 31 is located on the side of the second light-blocking pattern 32 close to the substrate, the cross-sectional shape of the first light-blocking pattern 31 in the direction parallel to the substrate comprises a ring-shaped octagon, which is arranged around the periphery of the first color filter pattern 21 and does not overlap with the orthographic projection of the first color filter pattern 21 on the substrate. The first light-blocking pattern 31 can be a blue color filter. At least part of the second light-blocking pattern 32 is located on the side of the first light-blocking pattern 31 away from the substrate and covers the first light-blocking pattern 31, and the orthographic projection of the second light-blocking pattern 32 on the substrate overlaps with the orthographic projection of the first light-blocking pattern 31 on the substrate. For example, the orthographic projection of the second light-blocking pattern 32 on the substrate covers the orthographic projection of the first light-blocking pattern 31 on the substrate. The cross-sectional shape of the second light-blocking pattern 321 in the direction parallel to the substrate comprises a ring-shaped octagon, which is arranged around the periphery of the first color filter pattern 21. At least part of the material of the first color filter pattern 21 diffuses along the direction parallel to the substrate and extends to the first non-sub-pixel region 51 to form the second light-blocking pattern 32, i.e., the second light-blocking pattern 32 and the first color filter pattern 21 can be prepared by the same preparation process using the same color filter film. For example, the second light-blocking pattern 32 and the first color filter pattern 21 can both be red color filters.

[0093] The substrate of the example embodiment can prevent the light emitted by the adjacent color filter pattern from mixing by overlapping the first light-blocking pattern 31 and the second light-blocking pattern 32 of two different colors to form a light-blocking region. Compared with the substrate of the display substrate in which the light-blocking region is formed by three light-blocking patterns of different colors and overlapping each other, the substrate of the example embodiment can reduce the height difference of the light-blocking region, reduce the thickness of the light-blocking region, and improve the uniformity of the film thickness of the light-blocking region and the sub-pixel region.

[0094] In the example embodiment, the color filter structure layer 16 further comprises a third light-blocking pattern 33 and a fourth light-blocking pattern 34 of two different colors and overlapping each other, both of which are located in the second non-sub-pixel region 52 and arranged around the periphery of the second color filter pattern 22. The overlapping region of the third light-blocking pattern 33 and the fourth light-blocking pattern 34 is a light-blocking region, which can prevent the second color filter pattern 22 from mixing with the light emitted by the adjacent color filter pattern.

[0095] In an example embodiment, at least part of the third light-blocking pattern 33 is located on the side of the fourth light-blocking pattern 34 close to the substrate, and the third light-blocking pattern 33 in the cross-sectional shape parallel to the substrate direction comprises an octagonal ring arranged around the periphery of the second color filter pattern 22. The material of at least part of the second color filter pattern 22 diffuses along the direction parallel to the substrate and extends to the second non-sub-pixel region 52 to form the third light-blocking pattern 33, that is, the third light-blocking pattern 33 and the second color filter pattern 22 can be made of the same color filter film by the same preparation process. For example, the third light-blocking pattern 33 and the second color filter pattern 22 can both be blue color filters. At least part of the fourth light-blocking pattern 34 is located on the side of the third light-blocking pattern 33 away from the substrate, covering the third light-blocking pattern 33, and there is an overlap between the third light-blocking pattern 33 and the orthographic projection of the third light-blocking pattern 33 on the substrate. The fourth light-blocking pattern 34 in the cross-sectional shape parallel to the substrate direction comprises an octagonal ring arranged around the periphery of the second color filter pattern 22.

[0096] The display substrate of the example embodiment can prevent color mixing of light emitted by adjacent color filter patterns by forming a light-blocking region by overlapping the third light-blocking pattern 33 and the fourth light-blocking pattern 34 of different colors with each other. Compared with a display substrate in which a light-blocking region is formed by three light-blocking patterns of different colors and overlapping with each other, the display substrate of the example embodiment can reduce the height difference of the light-blocking region, reduce the thickness of the light-blocking region, and improve the uniformity of the film thickness of the light-blocking region and the sub-pixel region.

[0097] In an example embodiment, the second color filter pattern 22 is adjacent to the first color filter pattern 21, and the second color filter pattern 22 is located on the side of the first color filter pattern 21 parallel to the substrate direction. The second non-sub-pixel region 52 and the first non-sub-pixel region 51 are arranged between the second color filter pattern 22 and the first color filter pattern 21. The material of the first color filter pattern 21 diffuses along the direction parallel to the substrate, passes through the first non-sub-pixel region 51, extends to the second non-sub-pixel region 52, and the material of the first color filter pattern 21 located in the first non-sub-pixel region 51 forms the second light-blocking pattern 32. The material of the first color filter pattern 21 located in the second non-sub-pixel region 52 and overlapping with the fourth light-blocking pattern 34 forms the fourth light-blocking pattern 34 in the region between the second color filter pattern 22 and the first color filter pattern 21.

[0098] In an example embodiment, the fourth light-blocking pattern 34, the second light-blocking pattern 32, and the first color filter pattern 21 can be made of the same color filter film by the same preparation process. For example, the fourth light-blocking pattern 34, the second light-blocking pattern 32, and the first color filter pattern 21 can all be red color filters.

[0099] In the exemplary embodiment, the second color filter pattern 22 and the first light blocking pattern 31 can be made of the same color filter film by the same manufacturing process. For example, the second color filter pattern 22 and the first light blocking pattern 31 can both be blue color filters.

[0100] In the exemplary embodiment, the color filter structure layer 16 further comprises a fifth light blocking pattern 35 and a sixth light blocking pattern 36, which are of different colors and overlap each other, and both of which are located in the third non-sub-pixel region 53 and surround the third color filter pattern 23. The overlapping area of the fifth light blocking pattern 35 and the sixth light blocking pattern 36 is a light blocking region, which can prevent the third color filter pattern 23 from mixing with the light emitted by the adjacent color filter pattern.

[0101] In the exemplary embodiment, at least part of the fifth light blocking pattern 35 is located on the side of the sixth light blocking pattern 36 close to the substrate, and the cross-sectional shape of the fifth light blocking pattern 35 in the direction parallel to the substrate comprises an octagonal ring surrounding the third color filter pattern 23. At least part of the material of the third color filter pattern 23 diffuses in the direction parallel to the substrate and extends to the third non-sub-pixel region 53 to form the fifth light blocking pattern 35, i.e., the fifth light blocking pattern 35 and the third color filter pattern 23 can be made of the same color filter film by the same manufacturing process. For example, the fifth light blocking pattern 35 and the third color filter pattern 23 can both be green color filters. At least part of the sixth light blocking pattern 36 is located on the side of the fifth light blocking pattern 35 away from the substrate and covers the fifth light blocking pattern 35, and the sixth light blocking pattern 36 overlaps the orthogonal projection of the fifth light blocking pattern 35 on the substrate. The cross-sectional shape of the sixth light blocking pattern 36 in the direction parallel to the substrate comprises an octagonal ring surrounding the third color filter pattern 23.

[0102] The substrate of the present embodiment shows that by overlapping the fifth light blocking pattern 35 and the sixth light blocking pattern 36 of different colors, a light blocking region is formed, which can prevent the light emitted by the adjacent color filter pattern from mixing. Compared with the display substrate using three layers of light blocking patterns of different colors and overlapping each other to form a light blocking region, the display substrate of the present embodiment can reduce the height difference of the light blocking region, reduce the thickness of the light blocking region, and improve the uniformity of the film thickness of the light blocking region and the sub-pixel region.

[0103] In an exemplary embodiment, the third color filter pattern 23 is adjacent to the first color filter pattern 21, the third color filter pattern 23 is located on one side of the first color filter pattern 21 in parallel to the substrate direction, and the third color filter pattern 23 and the first color filter pattern 21 are provided with the third non-sub-pixel region 53 and the first non-sub-pixel region 51. The material of the first color filter pattern 21 diffuses along the parallel direction to the substrate, passes through the first non-sub-pixel region 51, extends to the third non-sub-pixel region 53, and the material of the first color filter pattern 21 located in the first non-sub-pixel region 51 forms the second light blocking pattern 32. The material of the first color filter pattern 21 located in the third non-sub-pixel region 53 and the sixth light blocking pattern 36 overlap, and forms the sixth light blocking pattern 36 located in the region between the third color filter pattern 23 and the first color filter pattern 21.

[0104] In an exemplary embodiment, the sixth light blocking pattern 36, the second light blocking pattern 32 and the first color filter pattern 21 can be prepared by the same preparation process using the same color filter film. For example, the sixth light blocking pattern 36, the second light blocking pattern 32 and the first color filter pattern 21 can all be red color filters.

[0105] In an exemplary embodiment, the third color filter pattern 23 is adjacent to the second color filter pattern 22, the third color filter pattern 23 is located on one side of the second color filter pattern 22 in parallel to the substrate direction, and the third color filter pattern 23 and the second color filter pattern 22 are provided with the third non-sub-pixel region 53 and the second non-sub-pixel region 52. The sixth light blocking pattern 36 and the fourth light blocking pattern 34 located in the region between the second color filter pattern 22 and the third color filter pattern 23 are in an integrated structure, and the integrated structure and the fifth light blocking pattern 35 and the third light blocking pattern 33 have overlapping projections on the substrate. The integrated structure and the first color filter pattern 21 are located in the same film layer and are made of the same material.

[0106] In an exemplary embodiment, the integrated structure and the first color filter pattern 21 can be prepared by the same preparation process using the same color filter film. For example, the integrated structure and the first color filter pattern 21 can all be red color filters.

[0107] FIG. 7 is a curve diagram of red color filters, green color filters and blue light intensity. In an exemplary embodiment, as shown in FIG. 7, when the third color filter pattern 23 and the fifth light blocking pattern 35 of the display substrate are green color filters, the sixth light blocking pattern 36 is a red color filter, and the blue light emitted by the light emitting device is converted into green light by the third pattern 13, the fifth light blocking pattern 35 and the sixth light blocking pattern 36 are superimposed on each other to form a light blocking region, which can prevent color mixing of light emitted by adjacent color filter patterns, the sixth light blocking pattern 36 can absorb blue light that is not converted by the third pattern 13, thereby avoiding the emission of blue light and improving the color purity of the display substrate.

[0108] FIG. 3a is a schematic view of a cross-sectional structure of a display substrate according to an embodiment of the present application. FIG. 3a can be a cross-sectional view along the A-A' direction of FIG. 1. In an exemplary embodiment, as shown in FIG. 2 and FIG. 3a, the second color filter pattern 22, the first color filter pattern 21 and the third color filter pattern 23 in the display substrate according to an embodiment of the present application are octagonal in a cross-section parallel to the substrate direction, the second color filter pattern 22, the first color filter pattern 21 and the third color filter pattern 23 are arranged at intervals along the first direction D1, and the centers of the second color filter pattern 22, the first color filter pattern 21 and the third color filter pattern 23 are substantially aligned in the first direction D1. The maximum length of the material of the first color filter pattern 21 parallel to the substrate direction is d1, the maximum length of the material of the second color filter pattern 22 parallel to the substrate direction is d2, and the maximum length of the material of the third color filter pattern 23 parallel to the substrate direction is d3, and the d1, the d2 and the d3 satisfy the following relationship: d1>d3≥d2. The maximum length d1 of the material of the first color filter pattern 21 parallel to the substrate direction is the distance between the edge of the fourth light-blocking pattern 34 and the edge of the sixth light-blocking pattern 36 in the first direction D1. The maximum length d2 of the material of the second color filter pattern 22 parallel to the substrate direction is the distance between the edges of the third light-blocking pattern 33 in the first direction D1. The maximum length d3 of the material of the third color filter pattern 23 parallel to the substrate direction is the distance between the edges of the fifth light-blocking pattern 35 in the first direction D1.

[0109] In an exemplary embodiment, in the second non-sub-pixel region 52, the third light-blocking pattern 33 and the fourth light-blocking pattern 34 in the region between the third color filter pattern 43 and the second color filter pattern 42 overlap in a direction perpendicular to the substrate direction, and the maximum width of the overlapping region parallel to the substrate direction is W1; the maximum length of the material of the second color filter pattern 22 parallel to the substrate direction is d2; the maximum length of the second sub-pixel region 42 parallel to the substrate direction is d0, which can be the maximum length of the second pattern 12 parallel to the substrate direction; and the W1, the d2 and the d0 satisfy the following relationship: W1≤(d2-d0) / 2.

[0110] In the exemplary embodiment, in the third non-sub-pixel region 53, the fifth light-blocking pattern 35 and the sixth light-blocking pattern 36 in the region between the third color filter pattern 43 and the second color filter pattern 42 overlap in the direction perpendicular to the substrate, and the maximum width in the direction parallel to the substrate is W2; the maximum length of the material of the third color filter pattern 23 in the direction parallel to the substrate is d3; the maximum length of the third sub-pixel region 43 in the direction parallel to the substrate is d4, which can be the maximum length of the third pattern 13 in the direction parallel to the substrate; and the W2, the d3 and the d4 satisfy the following relationship: W2≤(d3-d4) / 2.

[0111] In the exemplary embodiment, the second sub-pixel region 42, the first sub-pixel region 41 and the third sub-pixel region 43 in the substrate are arranged along the first direction D1 to form a pixel unit, and a plurality of pixel units are arranged along the second direction D2. The minimum distance between the edges of the first sub-pixel region 41 in adjacent pixel units in the direction parallel to the substrate is S1, the minimum distance between the edge of the first sub-pixel region 41 and the edge of the adjacent third sub-pixel region 43 in the pixel unit in the direction parallel to the substrate is S2, and the minimum distance between the edge of the first sub-pixel region 41 and the edge of the adjacent second sub-pixel region 42 in the pixel unit in the direction parallel to the substrate is S3, wherein the S1, the S2 and the S3 are different from each other.

[0112] In the exemplary embodiment, the first pattern 11, the second pattern 12 and the third pattern 13 are rectangular in the cross section perpendicular to the substrate, and the boundary layer 14 between adjacent patterns is rectangular in the cross section perpendicular to the substrate. The first pattern 11, the second pattern 12 and the third pattern 13 each include an upper surface close to the color filter structure layer 106 and a lower surface away from the color filter structure layer 106, and the maximum length of the upper surface and the lower surface in the direction parallel to the substrate is substantially equal. The fourth light-blocking pattern 34 and the third light-blocking pattern 33 in the region between the second color filter pattern 42 and the first color filter pattern 41 overlap in the direction perpendicular to the substrate, and the maximum width in the direction parallel to the substrate is W RB , the maximum length of the second sub-pixel region 42 in the direction parallel to the substrate is d0; the maximum length of the material of the second color filter pattern 22 in the direction parallel to the substrate is d2; the W RB , the d2 and the d0 satisfy the following relationship: (d2-d0) / 3≤W RB ≤(d2-d0) / 2.

[0113] The substrate according to the embodiment of the present application satisfies (d2-d0) / 3≤W RB≤(d2-d0) / 2, which ensures that the material of the first color filter pattern 41 can diffuse along the direction parallel to the substrate and extend to the second non-sub-pixel region 52 to form the fourth light-blocking pattern 34, which overlaps with the third light-blocking pattern 33.

[0114] In an exemplary embodiment, the sixth light-blocking pattern 36 and the fifth light-blocking pattern 35 in the region between the third color filter pattern 43 and the first color filter pattern 41 overlap in the region perpendicular to the substrate direction, and the maximum width parallel to the substrate direction is W RG , the maximum length of the third sub-pixel region 43 parallel to the substrate direction is d4, the maximum length of the material of the third color filter pattern 23 parallel to the substrate direction is d3, and the W RG , the d3, and the d4 satisfy the following relationship: (d3-d4) / 3≤W RG ≤(d3-d4) / 2.

[0115] The substrate of the embodiment of the present application satisfies (d3-d4) / 3≤W RG ≤(d3-d4) / 2, which ensures that the material of the first color filter pattern 41 can diffuse along the direction parallel to the substrate and extend to the third non-sub-pixel region 53 to form the sixth light-blocking pattern 36, which overlaps with the fifth light-blocking pattern 35.

[0116] FIG. 3b is a schematic diagram of a cross-sectional structure of a display substrate according to an embodiment of the present application. FIG. 3b can be a cross-sectional view of the A-A’ direction in FIG. 1. In an exemplary embodiment, as shown in FIG. 2 and FIG. 3b, the first pattern 11, the second pattern 12, and the third pattern 13 are inverted trapezoids in the cross section perpendicular to the substrate direction, and the boundary layer 14 between adjacent patterns in the first pattern 11, the second pattern 12, and the third pattern 13 is a trapezoid in the cross section perpendicular to the substrate direction. The second pattern 12 includes an upper surface close to one side of the color filter structure layer 106 and a lower surface away from the other side of the color filter structure layer 106, the maximum length of the upper surface of the second pattern 12 parallel to the substrate direction is L2, the maximum length of the lower surface of the second pattern 12 parallel to the substrate direction is L1, and the maximum length L2 of the upper surface of the second pattern 12 is greater than the maximum length L1 of the lower surface of the second pattern 12. The fourth light-blocking pattern 34 and the third light-blocking pattern 33 in the region between the second color filter pattern 42 and the first color filter pattern 41 overlap in the region perpendicular to the substrate direction, and the maximum width parallel to the substrate direction is W RB , the maximum length of the material of the second color filter pattern 22 parallel to the substrate direction is d2, the W RB , the d2, the L1, and the L2 satisfy the following relationship: (d2-L2) / 2≤W RB ≤(d2-L1) / 2.

[0117] The substrate according to the embodiment of the present application satisfies (d2-L2) / 2≤W RB ≤(d2-L1) / 2, which ensures that the material of the first color filter pattern 41 can diffuse along the direction parallel to the substrate and extend to the second non-sub-pixel region 52 to form the fourth light-blocking pattern 34, which overlaps the third light-blocking pattern 33.

[0118] In the exemplary embodiment, the third pattern 13 includes an upper surface close to one side of the color filter structure layer 106 and a lower surface away from the other side of the color filter structure layer 106, the maximum length of the upper surface of the third pattern 13 in the direction parallel to the substrate is L3, the maximum length of the lower surface of the third pattern 13 in the direction parallel to the substrate is L4, and the maximum length L3 of the upper surface of the third pattern 13 is greater than the maximum length L4 of the lower surface of the third pattern 13. The sixth light-blocking pattern 36 and the fifth light-blocking pattern 35 in the region between the third color filter pattern 43 and the first color filter pattern 41 overlap in the region perpendicular to the substrate direction, and the maximum width of the overlapping region in the direction parallel to the substrate is W RG , the maximum length of the material of the third color filter pattern 23 in the direction parallel to the substrate is d3; the W RG , the d3, the L3 and the L4 satisfy the following relationship: (d3-L3) / 2≤W RG ≤(d3-L4) / 2.

[0119] The substrate according to the embodiment of the present application satisfies (d3-L3) / 2≤W RG ≤(d3-L4) / 2, which ensures that the material of the first color filter pattern 41 can diffuse along the direction parallel to the substrate and extend to the third non-sub-pixel region 53 to form the sixth light-blocking pattern 36, which overlaps the fifth light-blocking pattern 35.

[0120] In the exemplary embodiment, the maximum thickness of the material of the first color filter pattern 41 is h1, the maximum thickness of the material of the second color filter pattern 42 is h2, the maximum thickness of the material of the third color filter pattern 43 is h3, the maximum thickness of the integrated structure formed by the sixth light-blocking pattern 36 and the fourth light-blocking pattern 34 in the region between the second color filter pattern 22 and the third color filter pattern 23 is h4, and the h1, the h2, the h3 and the h4 satisfy the following relationship: h1>h4≥h2, h1>h4≥h3.

[0121] The substrate according to the embodiment of the present application satisfies h1>h4≥h2 and h1>h4≥h3, so that the maximum thickness of the color filter structure layer 106 is the maximum thickness h1 of the material of the first color filter pattern 41. Compared with the display substrate using three layers of color filter patterns with different colors and overlapping with each other to form a light-blocking region, the height step of the light-blocking region can be reduced, the thickness of the light-blocking region can be reduced, and the uniformity of the film thickness of the light-blocking region and the sub-pixel region can be improved.

[0122] The preparation process of the display substrate is exemplarily illustrated below. The "patterning process" in the present disclosure includes coating photoresist, mask exposure, development, etching, stripping photoresist and the like for metal material, inorganic material or transparent conductive material, and includes coating organic material, mask exposure and development and the like for organic material. The deposition can adopt any one or more of sputtering, evaporation, chemical vapor deposition, the coating can adopt any one or more of spraying, spin coating and inkjet printing, and the etching can adopt any one or more of dry etching and wet etching, which are not limited in the present disclosure. The "thin film" refers to a thin film of a certain material on a substrate by deposition, coating or other processes. If the "thin film" does not need a patterning process in the whole preparation process, the "thin film" can also be referred to as a "layer". If the "thin film" needs a patterning process in the whole preparation process, it is referred to as a "thin film" before the patterning process and a "layer" after the patterning process. The "layer" after the patterning process contains at least one "pattern". The "A and B are arranged in the same layer" in the present disclosure means that A and B are formed at the same time by the same patterning process. The "thickness" of the film layer is the size of the film layer in the direction perpendicular to the display substrate. In the exemplary embodiments of the present disclosure, "the orthographic projection of B is within the orthographic projection of A" or "the orthographic projection of A contains the orthographic projection of B" means that the boundary of the orthographic projection of B falls within the boundary of the orthographic projection of A, or the boundary of the orthographic projection of A overlaps with the boundary of the orthographic projection of B.

[0123] In the exemplary embodiments, the display substrate of the present embodiment includes a first sub-pixel region 41 and a first non-sub-pixel region 51 surrounding the first sub-pixel region 41, a second sub-pixel region 42 and a second non-sub-pixel region 52 surrounding the second sub-pixel region 42, and a third sub-pixel region 43 and a third non-sub-pixel region 53 surrounding the third sub-pixel region 43. The preparation process of the display substrate of the present embodiment can include the following operations.

[0124] (11) forming a color conversion structure layer.

[0125] In the exemplary embodiments, forming the color conversion structure layer can include forming a driving circuit layer 102 on the substrate 101, forming a light-emitting structure layer 103 on the driving circuit layer 102 away from the substrate 101, forming an encapsulation structure layer 104 on the light-emitting structure layer 103 away from the substrate 101, and forming a color conversion structure layer 105 on the encapsulation structure layer 104 away from the substrate 101, as shown in FIGS. 4a and 4b.

[0126] In the exemplary embodiments, the light-emitting device of the light-emitting structure layer 103 is a blue OLED light-emitting device, and the blue OLED light-emitting device can emit blue light.

[0127] In the example embodiment, the color conversion structure layer 105 comprises the second pattern 12, the first pattern 11 and the third pattern 13 arranged along a direction parallel to the substrate 101, and a boundary layer 14 is arranged between adjacent patterns of the second pattern 12, the first pattern 11 and the third pattern 13. The second pattern 12 is located in the second sub-pixel region 42, and the second pattern 12 is a transmissive pattern with a transmittance of visible light greater than 90%, which can transmit the blue light emitted by the light emitting device. The first pattern 11 is located in the first sub-pixel region 41, and the first pattern 11 is a red conversion pattern which can convert the blue light emitted by the light emitting device into red light. The third pattern 13 is located in the third sub-pixel region 43, and the third pattern 13 is a green conversion pattern which can convert the blue light emitted by the light emitting device into green light. The boundary layer 14 located around the second pattern 12 is located in the second non-sub-pixel region 52, the boundary layer 14 located around the first pattern 11 is located in the first non-sub-pixel region 51, and the boundary layer 14 located around the third pattern 13 is located in the third non-sub-pixel region 53.

[0128] In the example embodiment, the second pattern 12, the first pattern 11 and the third pattern 13 can have an octagonal shape in a cross section parallel to the substrate 101.

[0129] In some embodiments, the second pattern 12, the first pattern 11 and the third pattern 13 can also have a rectangular, rhombic or pentagonal shape in a cross section parallel to the substrate 101.

[0130] In the example embodiment, the second pattern 12, the first pattern 11 and the third pattern 13 can have a rectangular shape in a cross section perpendicular to the substrate 101. In some embodiments, the second pattern 12, the first pattern 11 and the third pattern 13 can have a trapezoidal shape in a cross section perpendicular to the substrate 101.

[0131] (12) forming a second color filter layer.

[0132] In the example embodiment, forming the second color filter layer can comprise: depositing a second color filter film on the substrate 101 on which the aforementioned patterns are formed, and patterning the second color filter film by a patterning process to form the second color filter layer, as shown in FIGS. 5a and 5b.

[0133] In the example embodiment, the second color filter layer comprises a second color filter pattern 22, a first light blocking pattern 31 and a third light blocking pattern 33.

[0134] In an exemplary embodiment, the second color filter pattern 22 can be a blue color filter pattern. The second color filter pattern 22 has a shape in parallel to the substrate direction including an octagon, the second color filter pattern 22 is located in the second sub-pixel region 42, and a projection of the second color filter pattern 22 on the substrate 101 overlaps with a projection of the second pattern 12 on the substrate 101. For example, the projection of the second color filter pattern 22 on the substrate 101 completely overlaps with the projection of the second pattern 12 on the substrate 101.

[0135] In an exemplary embodiment, the third light-blocking pattern 33 has a shape in parallel to the substrate direction including a ring of octagons, the third light-blocking pattern 33 is arranged around the second color filter pattern 22 and is integrated with the second color filter pattern 22, the third light-blocking pattern 33 is located in the second non-sub-pixel region 52, and a projection of the third light-blocking pattern 33 on the substrate 101 overlaps with a projection of the boundary layer 14 on the substrate 101. For example, the projection of the third light-blocking pattern 33 on the substrate 101 is located in the projection of the boundary layer 14 on the substrate 101.

[0136] In an exemplary embodiment, the first light-blocking pattern 31 has a shape in parallel to the substrate direction including a ring of octagons, the first light-blocking pattern 31 is arranged around the first pattern 11. The first light-blocking pattern 31 is located in the first non-sub-pixel region 51, and a projection of the first light-blocking pattern 31 on the substrate 101 overlaps with a projection of the boundary layer 14 on the substrate 101. For example, the projection of the first light-blocking pattern 31 on the substrate 101 is located in the projection of the boundary layer 14 on the substrate 101. The projection of the first light-blocking pattern 31 on the substrate 101 does not overlap with a projection of the third light-blocking pattern 33 on the substrate 101. For example, the first light-blocking pattern 31 and the third light-blocking pattern 33 are arranged in parallel to the substrate direction with a spacing.

[0137] (13) Forming a third color filter layer.

[0138] In an exemplary embodiment, forming the third color filter layer can include: depositing a third color filter film on the substrate 101 on which the aforementioned patterns are formed, on a side of the light-emitting structure layer away from the substrate 101, and patterning the third color filter film through a patterning process to form the third color filter layer, as shown in FIGS. 6a and 6b.

[0139] In an exemplary embodiment, the third color filter layer includes a third color filter pattern 23 and a fifth light-blocking pattern 35.

[0140] In an exemplary embodiment, the third color filter pattern 23 can be a green color filter pattern. The third color filter pattern 23 has a shape in parallel to the substrate direction including an octagon, the third color filter pattern 23 is located in the third sub-pixel region 43, and a projection of the third color filter pattern 23 on the substrate 101 overlaps with a projection of the third pattern 13 on the substrate 101. For example, the projection of the third color filter pattern 23 on the substrate 101 completely overlaps with the projection of the third pattern 13 on the substrate 101.

[0141] In an exemplary embodiment, the fifth light blocking pattern 35 has a shape in parallel to the substrate direction including a ring-shaped octagon, the fifth light blocking pattern 35 is arranged around the third color filter pattern 23 and is connected to the third color filter pattern 23 as a whole, the fifth light blocking pattern 35 is located in the third non-sub-pixel region 53, and a projection of the fifth light blocking pattern 35 on the substrate 101 overlaps with a projection of the boundary layer 14 on the substrate 101. For example, the projection of the fifth light blocking pattern 35 on the substrate 101 is located in the projection of the boundary layer 14 on the substrate 101. The fifth light blocking pattern 35 is arranged on one side of the third light blocking pattern 33 in the first direction D1, the projection of the fifth light blocking pattern 35 on the substrate 101 does not overlap with the projection of the third light blocking pattern 33 on the substrate 101, and for example, the fifth light blocking pattern 35 is arranged apart from the third light blocking pattern 33 in parallel to the substrate direction. The fifth light blocking pattern 35 is arranged on one side of the first light blocking pattern 31 in the first direction D1, the projection of the fifth light blocking pattern 35 on the substrate 101 does not overlap with the projection of the first light blocking pattern 31 on the substrate 101, and for example, the fifth light blocking pattern 35 is arranged apart from the first light blocking pattern 31 in parallel to the substrate direction.

[0142] (14) forming a first color filter layer.

[0143] In an exemplary embodiment, forming the first color filter layer can include: depositing a first color filter thin film on the substrate 101 on which the aforementioned patterns are formed, on a side of the light emitting structure layer away from the substrate 101, and patterning the first color filter thin film by a patterning process to form the first color filter layer, as shown in FIGS. 1 and 2.

[0144] In an exemplary embodiment, the first color filter layer includes the first color filter pattern 21, the second light blocking pattern 32, the fourth light blocking pattern 34, and the sixth light blocking pattern 36.

[0145] In an exemplary embodiment, the first color filter pattern 21 can be a red color filter pattern. The first color filter pattern 21 has a shape in parallel to the substrate direction including an octagon, the first color filter pattern 21 is located in the first sub-pixel region 41, and a projection of the first color filter pattern 21 on the substrate 101 overlaps with a projection of the first pattern 11 on the substrate 101. For example, the projection of the first color filter pattern 21 on the substrate 101 completely overlaps with the projection of the first pattern 11 on the substrate 101.

[0146] In an exemplary embodiment, the second light-blocking pattern 32 has a shape in parallel to the substrate direction including a ring of octagons, the second light-blocking pattern 32 is arranged around the first color filter pattern 21, and the second light-blocking pattern 32 is connected to the first color filter pattern 21 as a whole. The second light-blocking pattern 32 is located in the first non-sub-pixel region 51, and a projection of the second light-blocking pattern 32 on the substrate 101 overlaps with a projection of the boundary layer 14 on the substrate 101. For example, the projection of the second light-blocking pattern 32 on the substrate 101 is located in the projection of the boundary layer 14 on the substrate 101. At least part of the second light-blocking pattern 32 is arranged on a side of the first light-blocking pattern 31 away from the substrate 101, and a projection of the second light-blocking pattern 32 on the substrate 101 overlaps with a projection of the first light-blocking pattern 31 on the substrate 101. For example, the projection of the second light-blocking pattern 32 on the substrate 101 covers the projection of the first light-blocking pattern 31 on the substrate 101.

[0147] In an exemplary embodiment, the fourth light-blocking pattern 34 has a shape in parallel to the substrate direction including a ring of octagons, the fourth light-blocking pattern 34 is arranged around the second color filter pattern 22. The fourth light-blocking pattern 34 is located in the second non-sub-pixel region 52, and a projection of the fourth light-blocking pattern 34 on the substrate 101 overlaps with a projection of the boundary layer 14 on the substrate 101. For example, the projection of the fourth light-blocking pattern 34 on the substrate 101 is located in the projection of the boundary layer 14 on the substrate 101. At least part of the fourth light-blocking pattern 34 is arranged on a side of the third light-blocking pattern 33 away from the substrate 101, and a projection of the fourth light-blocking pattern 34 on the substrate 101 overlaps with a projection of the third light-blocking pattern 33 on the substrate 101.

[0148] In an exemplary embodiment, the sixth light-blocking pattern 36 comprises a ring shape of octagon in a direction parallel to the substrate, and the sixth light-blocking pattern 36 is arranged around the third color filter pattern 23. The sixth light-blocking pattern 36 is located in the third non-sub-pixel region 53, and the orthographic projection of the sixth light-blocking pattern 36 on the substrate 101 overlaps with the orthographic projection of the delimiting layer 14 on the substrate 101. For example, the orthographic projection of the sixth light-blocking pattern 36 on the substrate 101 is located in the orthographic projection of the delimiting layer 14 on the substrate 101. At least part of the sixth light-blocking pattern 36 is arranged on the side of the fifth light-blocking pattern 35 away from the substrate 101, and the orthographic projection of at least part of the sixth light-blocking pattern 36 on the substrate 101 overlaps with the orthographic projection of the fifth light-blocking pattern 35 on the substrate 101.

[0149] In an exemplary embodiment, the first color filter pattern 21 is adjacent to the second color filter pattern 22 on one side in the first direction D1, and is adjacent to the third color filter pattern 23 on the other side in the first direction D1. The material of the first color filter pattern 21 diffuses in a direction parallel to the substrate 101, and at least part of the material of the first color filter pattern 21 extends to the first non-sub-pixel region 51, covers the first light-blocking pattern 31, and forms the second light-blocking pattern 32. At least part of the material of the first color filter pattern 21 extends to the second non-sub-pixel region 52, covers the third light-blocking pattern 33, and forms the fourth light-blocking pattern 34 in the region between the first color filter pattern 21 and the second color filter pattern 22. At least part of the material of the first color filter pattern 21 extends to the third non-sub-pixel region 53, covers the fifth light-blocking pattern 35, and forms the sixth light-blocking pattern 36 in the region between the first color filter pattern 21 and the third color filter pattern 23.

[0150] In an exemplary embodiment, the first color filter pattern 21, the second light-blocking pattern 32, the fourth light-blocking pattern 34, and the sixth light-blocking pattern 36 are made of the same color filter film and are prepared by the same patterning process.

[0151] FIG. 8 is a schematic diagram of a planar structure of a display substrate according to an embodiment of the present application. As shown in FIG. 8, the structure of the display substrate according to the present embodiment is basically the same as that of the display substrate shown in FIG. 1, except that the first sub-pixel region 41, the second sub-pixel region 42, and the third sub-pixel region 43 of the display substrate according to the present embodiment are arranged in a triangular shape in a direction parallel to the display substrate, forming a pixel unit, and adjacent pixel units can share a third sub-pixel region 43.

[0152] The present disclosure also provides a method for preparing a display substrate, the display substrate comprising a first sub-pixel region and a first non-sub-pixel region around the first sub-pixel region, the method comprising:

[0153] forming a first light-blocking pattern on the base, the first light-blocking pattern being located in the first non-sub-pixel region;

[0154] forming a first color filter pattern on the base, the first color filter pattern being located in the first sub-pixel region, material of at least part of the first color filter pattern extending to the first non-sub-pixel region, forming a second light-blocking pattern, the second light-blocking pattern being different from the first light-blocking pattern in color, the second light-blocking pattern being arranged on a side of the first light-blocking pattern away from the base, and at least part of the second light-blocking pattern overlapping with the first light-blocking pattern in orthographic projection on the base.

[0155] The present disclosure also provides a display device including the display substrate of the foregoing example embodiments. The display device can be any product or component with display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or the like.

[0156] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures can be referred to the general design. In the case of no conflict, the embodiments of the present disclosure, i.e., the features in the embodiments, can be combined with each other to obtain new embodiments.

[0157] Those skilled in the art should understand that the technical solutions of the present disclosure can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present disclosure, and all should be covered in the scope of the claims of the present disclosure.

Claims

1. A display substrate, comprising a first sub-pixel region, and a first non-sub-pixel region located around the first sub-pixel region; The display substrate comprises a color filter structure layer disposed on a base: The color filter structure layer comprises: a first color filter pattern disposed on the base, the first color filter pattern being located in the first sub-pixel region; two first and second light-blocking patterns of different colors disposed on the base, the first and second light-blocking patterns both being located in the first non-sub-pixel region; the second light-blocking pattern being disposed on a side of the first light-blocking pattern away from the base, and at least part of the second light-blocking pattern overlapping a projection of the first light-blocking pattern on the base; material of at least part of the first color filter pattern extending to the first non-sub-pixel region to form the second light-blocking pattern. 2.The display substrate of claim 1, wherein, A projection of the second light-blocking pattern on the base covers a projection of the first light-blocking pattern on the base. 3.The display substrate of claim 1, wherein, The first color filter pattern and the second light-blocking pattern are both red color filters, and the first light-blocking pattern is a blue color filter. 4.The display substrate of claim 1, further comprising a second sub-pixel region, and a second non-sub-pixel region located around the second sub-pixel region; The color filter structure layer further comprises: a second color filter pattern disposed on the base, the second color filter pattern being located in the second sub-pixel region; two third and fourth light-blocking patterns of different colors disposed on the base, the third and fourth light-blocking patterns both being located in the second non-sub-pixel region; the fourth light-blocking pattern being disposed on a side of the third light-blocking pattern away from the base, and at least part of the fourth light-blocking pattern overlapping a projection of the third light-blocking pattern on the base; material of at least part of the second color filter pattern extending to the second non-sub-pixel region to form the third light-blocking pattern. 5.The display substrate of claim 4, wherein, The second color filter pattern is adjacent to the first color filter pattern, and material of at least part of the first color filter pattern extends to the second non-sub-pixel region to form the fourth light-blocking pattern in a region between the second color filter pattern and the first color filter pattern. 6.The display substrate of claim 5, wherein, A maximum thickness of material of the first color filter pattern is h1, and a maximum thickness of material of the second color filter pattern is h2, the h1 and the h2 satisfying the following relationship: h1>h2. 7.The display substrate of claim 5, further comprising a color conversion structure layer disposed on the substrate, the color conversion structure layer disposed on the color filter structure layer close to the substrate, the color conversion structure layer comprising at least one second pattern, the at least one second pattern located in the second sub-pixel region and overlapping with the normal projection of the second color filter pattern on the substrate, the second pattern comprising an upper surface close to the color filter structure layer and a lower surface away from the color filter structure layer, the upper surface and the lower surface having a maximum length in parallel to the substrate direction and substantially equal, the fourth light blocking pattern and the third light blocking pattern in an area overlapping in a direction perpendicular to the substrate direction in a region between the second color filter pattern and the first color filter pattern having a maximum width in parallel to the substrate direction of W RB , the second sub-pixel region having a maximum length in parallel to the substrate direction of d 0, the second color filter pattern having a maximum length in parallel to the substrate direction of d 2, the W RB , the d 2 and the d 0 satisfying the following relationship: (d 2 -d 0 ) / 3≤W RB ≤(d 2 -d 0 ) / 2. 8.The display substrate of claim 5, further comprising a color conversion structure layer disposed on the substrate, the color conversion structure layer disposed on the color filter structure layer close to the substrate, the color conversion structure layer comprising at least one second pattern, the at least one second pattern located in the second sub-pixel region and overlapping with the normal projection of the second color filter pattern on the substrate, the second pattern comprising an upper surface close to the color filter structure layer and a lower surface away from the color filter structure layer, the maximum length L2 of the upper surface in the direction parallel to the substrate being greater than the maximum length L1 of the lower surface in the direction parallel to the substrate, the maximum width W of the overlapping area of the fourth light blocking pattern and the third light blocking pattern in the direction parallel to the substrate being located in the area between the second color filter pattern and the first color filter pattern. RB , the maximum length of the material of the second color filter pattern in the direction parallel to the substrate being d2, the W RB , the d2, the L1 and the L2 satisfying the following relationship: (d2-L2) / 2≤W RB ≤(d2-L1) / 2. 9.The display substrate of claim 4, wherein, The second color filter pattern and the first light-blocking pattern are located in the same film layer and comprise the same color filter material. 10.The display substrate of claim 4, wherein, The second color filter pattern and the third light-blocking pattern are both blue color filters, and the fourth light-blocking pattern is a red color filter. 11.The display substrate of claim 4, further comprising a third sub-pixel region, and a third non-sub-pixel region located around the third sub-pixel region; The color filter structure layer further comprises: a third color filter pattern disposed on the base, the third color filter pattern being located in the third sub-pixel region; two fifth and sixth light-blocking patterns of different colors disposed on the base, the fifth and sixth light-blocking patterns both being located in the third non-sub-pixel region. The sixth light-blocking pattern is arranged on the side of the fifth light-blocking pattern away from the substrate, and at least part of the sixth light-blocking pattern overlaps with the orthographic projection of the fifth light-blocking pattern on the substrate. At least part of the material of the third color filter pattern extends to the third non-sub-pixel region to form the fifth light-blocking pattern. 12.The display substrate of claim 11, wherein, The third color filter pattern is adjacent to the second color filter pattern, the sixth light-blocking pattern and the fourth light-blocking pattern in the region between the second color filter pattern and the third color filter pattern are in an integrated structure, the integrated structure is in the same film layer as the first color filter pattern and is made of the same material. 13.The display substrate of claim 12, wherein, The maximum width of the region where the fourth light-blocking pattern and the third light-blocking pattern overlap in the direction parallel to the substrate in the region between the third color filter pattern and the second color filter pattern is W1, the maximum length of the second sub-pixel region in the direction parallel to the substrate is d0, and the maximum length of the material of the second color filter pattern in the direction parallel to the substrate is d2, and the W1, the d2 and the d0 satisfy the following relationship: W1≤(d2-d0) / 2. 14.The display substrate of claim 12, wherein, The maximum width of the region where the sixth light-blocking pattern and the fifth light-blocking pattern overlap in the direction parallel to the substrate in the region between the third color filter pattern and the second color filter pattern is W2, the maximum length of the third sub-pixel region in the direction parallel to the substrate is d4, and the maximum length of the material of the third color filter pattern in the direction parallel to the substrate is d3, and the W2, the d3 and the d4 satisfy the following relationship: W2≤(d3-d4) / 2. 15.The display substrate of claim 12, further comprising a color conversion structure layer disposed on the substrate, the color conversion structure layer disposed on the color filter structure layer close to the substrate, the color conversion structure layer comprising at least one third pattern, the at least one third pattern located in the third sub-pixel region and overlapping with the third color filter pattern in the orthographic projection on the substrate, the third pattern comprising an upper surface close to the color filter structure layer and a lower surface away from the color filter structure layer, the upper surface and the lower surface having a maximum length in the direction parallel to the substrate substantially equal, a maximum width of an area in which the sixth light blocking pattern and the fifth light blocking pattern overlap in the direction perpendicular to the substrate in the area between the third color filter pattern and the first color filter pattern being W RG , a maximum length of the third sub-pixel region in the direction parallel to the substrate being d4, a maximum length of the third color filter pattern in the direction parallel to the substrate being d3, the W RG , the d3 and the d4 satisfying the following relationship: (d3-d4) / 3≤W RG ≤(d3-d4) / 2. 16.The display substrate of claim 12, further comprising a color conversion structure layer disposed on the substrate, the color conversion structure layer disposed on the color filter structure layer close to the substrate, the color conversion structure layer comprising at least one third pattern, the at least one third pattern located in the third sub-pixel region and overlapping with the third color filter pattern in the orthographic projection on the substrate, the third pattern comprising an upper surface close to the color filter structure layer and a lower surface away from the color filter structure layer, the upper surface having a maximum length L3 in the direction parallel to the substrate greater than a maximum length L4 of the lower surface in the direction parallel to the substrate, the maximum width W of the overlapping area of the sixth light blocking pattern and the fifth light blocking pattern in the direction parallel to the substrate in the area between the third sub-pixel region and the first sub-pixel region being in the direction perpendicular to the substrate. RG , the maximum length of the material of the third color filter pattern in the direction parallel to the substrate being d3, the W RG , the d3, the L3 and the L4 satisfying the following relationship: (d3-L3) / 2≤W RG ≤(d3-L4) / 2. 17.The display substrate of claim 12, wherein, The sixth light-blocking pattern and the fourth light-blocking pattern in the region between the third color filter pattern and the second color filter pattern are in an integrated structure. 18.The display substrate of claim 12, wherein, The maximum thickness of the integrated structure is h4, the maximum thickness of the material of the first color filter pattern is h1, and the maximum thickness of the material of the second color filter pattern is h2, and the h1, the h2 and the h4 satisfy the following relationship: h1>h4≥h2.

19. The display substrate of claim 12, wherein, The third color filter pattern is adjacent to the first color filter pattern, and at least part of the material of the first color filter pattern extends to the third non-sub-pixel region to form the sixth light-blocking pattern in the region between the third color filter pattern and the first color filter pattern.

20. The display substrate of claim 12, wherein, The third color filter pattern and the fifth light-blocking pattern are both green color filters.

21. The display substrate of any one of claims 1 to 18, further comprising a second sub-pixel region and a third sub-pixel region, the second sub-pixel region is provided with a second color filter pattern, and the third sub-pixel region is provided with a third color filter pattern, the maximum length of the material of the first color filter pattern in the direction parallel to the substrate is d1, the maximum length of the material of the second color filter pattern in the direction parallel to the substrate is d2, the maximum length of the material of the third color filter pattern in the direction parallel to the substrate is d3, and the d1, the d2 and the d3 satisfy the following relationship: d1>d3≥d2.

22. The display substrate of any one of claims 1 to 18, further comprising a second sub-pixel region and a third sub-pixel region, a minimum distance between edges of the first sub-pixel region and edges of an adjacent second sub-pixel region in a direction parallel to the substrate is S3, a minimum distance between edges of the first sub-pixel region and edges of an adjacent third sub-pixel region in the direction parallel to the substrate is S2, and a minimum distance between edges of the first sub-pixel region and edges of an adjacent second sub-pixel region in the direction parallel to the substrate is S1, wherein S1, S2 and S3 are different from each other.

23. A display device comprising the display substrate of any one of claims 1 to 22.

24. A method of manufacturing a display substrate, the display substrate comprising a first sub-pixel region and a first non-sub-pixel region surrounding the first sub-pixel region, the method comprising: forming a first light-blocking pattern on a substrate, the first light-blocking pattern being located in the first non-sub-pixel region; and forming a first color filter pattern on the substrate, the first color filter pattern being located in the first sub-pixel region, a material of at least part of the first color filter pattern extending to the first non-sub-pixel region to form a second light-blocking pattern, the second light-blocking pattern having a color different from a color of the first light-blocking pattern, the second light-blocking pattern being disposed on a side of the first light-blocking pattern away from the substrate, and at least part of the second light-blocking pattern overlapping a projection of the first light-blocking pattern on the substrate. ​ ​

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