Display substrate and display device

Abstract

The invention provides a display substrate and a display device. The display substrate comprises a substrate, and a light-emitting layer is arranged on one side of the substrate; the color film layer is located on one side of the light-emitting layer away from the substrate; the regulation and control layer is located on the side, away from the substrate, of the color film layer, the regulation and control layer comprises a plurality of regulation and control protrusions arranged at intervals, the micro lens layer is located on the side, away from the substrate, of the color film layer, and the micro lens layer comprises a plurality of micro lenses arranged in an array mode; wherein on a plane perpendicular to the display substrate, the regulation and control bulge comprises a first plane and a second plane, the first plane and the second plane intersect to form an obtuse angle, and the orthographic projection of the vertex of the obtuse angle on the substrate is at least partially overlapped with the orthographic projection of at least one micro lens on the substrate; in this way, the emergent light cannot be emitted to the light emitting direction of the display substrate, so that the emergent light emitted from the regulation and control protrusions cannot generate crosstalk on light normally emitted from the interval between every two adjacent regulation and control protrusions, and large-view-angle color cast is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display substrate and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) use organic light-emitting materials as their light source, easily meeting market demands for high pixel density, high contrast, low power consumption, and fast response speeds. However, existing OLED display devices are prone to crosstalk from various emitted light rays, resulting in impure monochromatic colors over wide viewing angles and reducing the user's visual experience. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a display substrate and a display device.

[0004] To achieve the above objectives, the first aspect of this application provides a display substrate, comprising:

[0005] A substrate, wherein a light-emitting layer is provided on one side of the substrate;

[0006] A color filter layer is located on the side of the light-emitting layer away from the substrate;

[0007] A control layer is located on the side of the color filter layer away from the substrate, and the control layer includes a plurality of control protrusions spaced apart.

[0008] A microlens layer is located on the side of the color filter layer away from the substrate, and the microlens layer includes a plurality of microlenses arranged in an array;

[0009] Wherein, on a plane perpendicular to the display substrate, the adjustment protrusion includes a first plane and a second plane, the first plane and the second plane intersect at an obtuse angle, and the orthographic projection of the vertex of the obtuse angle on the substrate at least partially overlaps with the orthographic projection of at least one of the microlenses on the substrate.

[0010] Optionally, a planarization layer is further provided between the control layer and the microlens layer, the planarization layer completely covering the color filter layer and the control layer, and the refractive index of the control layer is greater than the refractive index of the planarization layer.

[0011] Optionally, the ratio of the thickness of the control layer to the thickness of the planarization layer is 0.5:1 to 1:1.

[0012] Optionally, the regulating protrusion includes multiple sidewalls, and at least one regulating protrusion has two opposite sidewalls that are inclined surfaces.

[0013] Optionally, the adjustment protrusion further includes a third plane, which is the plane connecting the adjustment protrusion and the color filter layer, and the orthographic projection of the first plane on the substrate lies within the orthographic projection of the third plane on the substrate.

[0014] Optionally, the angles between the two opposite sidewalls of the regulating protrusion and the third plane are a first angle and a second angle, respectively, and both the first angle and the second angle are 50° to 70°.

[0015] Optionally, the color filter layer includes a plurality of color filters, the interval between two adjacent control protrusions is a control interval, and the orthographic projection of the control interval on the substrate lies within the orthographic projection of one of the color filters on the substrate.

[0016] Optionally, the ratio of the area of ​​the orthographic projection of the adjustment interval on the substrate to the area of ​​the orthographic projection of the corresponding color filter on the substrate is 1:10 to 9:10.

[0017] Optionally, the orthographic projection of each of the control protrusions on the substrate partially overlaps with the orthographic projections of the two adjacent color filters on the substrate, and the control protrusions and one of the color filters are made of the same material.

[0018] Optionally, the plurality of color filters includes a first color filter; when the orthographic projection of the control protrusion on the substrate coincides with the orthographic projection of the first color filter on the substrate, there is a gap between the first plane and the top surface of the flat layer away from the substrate, so that at least a portion of the light emitted from the first color filter passes directly through the gap and exits the flat layer.

[0019] Optionally, both the first plane and the second plane near the first color filter are inclined relative to the horizontal plane, wherein the direction of the inclination is from the interval toward the first color filter.

[0020] Based on the same inventive concept, a second aspect of this application provides a display device comprising the display substrate described in any of the first aspects above.

[0021] As can be seen from the above description, the display substrate and display device provided in this application have a control layer disposed on the side of the color filter layer away from the substrate. The control layer includes a plurality of spaced control protrusions. On a plane perpendicular to the display substrate, the control protrusions include a first plane and a second plane. The first plane and the second plane intersect at an obtuse angle. The orthographic projection of the vertex of the obtuse angle onto the substrate at least partially overlaps with the orthographic projection of at least one of the microlenses onto the substrate. This allows the incident light entering the control protrusions to be controlled by the control protrusions, thereby allowing the corresponding outgoing light to enter the color filter layer or exit from both sides of the display substrate. In this way, the outgoing light will not be directed towards the light-emitting direction of the display substrate, so that the outgoing light emitted from the control protrusions will not cause crosstalk to the light emitted normally from the gap between two adjacent control protrusions, and will not affect the large viewing angle color deviation of the light, thereby improving the large viewing angle color deviation and enhancing the user's visual experience. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an exemplary cross-sectional schematic diagram of a display substrate in related technologies;

[0024] Figure 2 This is a simulation diagram of the optical path of light on a display substrate in related technologies;

[0025] Figure 3 This is a first cross-sectional schematic diagram of the display substrate according to an embodiment of this application;

[0026] Figure 4 This is a simulation diagram of the first optical path of light on the display substrate according to an embodiment of this application;

[0027] Figure 5 This is a simulation diagram of a second optical path of light on the display substrate according to an embodiment of this application;

[0028] Figure 6 This is a second cross-sectional schematic diagram of the display substrate according to an embodiment of this application;

[0029] Figure 7 This is a third cross-sectional view of the display substrate according to an embodiment of this application;

[0030] Figure 8 An optical path simulation diagram for controlling the light rays when the protrusion is an inverted trapezoidal structure;

[0031] Figure 9 This is a simulation diagram of the optical path of light from the control protrusions of the display substrate in an embodiment of this application;

[0032] Figure 10 This is a fourth cross-sectional view of the display substrate according to an embodiment of this application;

[0033] Figure 11 This is a fifth cross-sectional view of the display substrate according to an embodiment of this application;

[0034] Figure 12 This is a simulation diagram of a third optical path of light from a display substrate according to an embodiment of this application;

[0035] Figure 13 This is a test result graph of the blue light brightness decay test according to an embodiment of this application. In the graph, the vertical axis L-Decay represents the brightness decay.

[0036] Figure 14 This is a test result diagram of the large-view character color deviation according to an embodiment of this application. In the diagram, the vertical axis Du′v′ represents the color deviation value.

[0037] In the diagram: 1. Substrate; 2. Emitting layer; 3. Encapsulation layer; 4. Color filter layer; 41. Red filter protrusion; 42. Green filter protrusion; 43. Color filter; 431. First color filter; 432. Second color filter; 433. Third color filter; 5. Planarization layer; 51. Spacer; 6. Microlens layer; 61. Microlens; 7. Adhesive layer; 8. Cover plate; 9. Control layer; 91. Control protrusion; 911. First plane; 912. Third plane; 913. Second plane; 914. Obtuse angle; 92. Control interval. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0039] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] With the gradual development of augmented reality (AR) and virtual reality (VR) technologies, silicon-based OLEDs have emerged as the optimal display device for AR / VR. Organic light-emitting diodes (OLEDs) use organic light-emitting materials as their light source, while silicon-based OLEDs use single-crystal silicon wafers as the driving backplane, easily achieving the high pixel density (PPI), high contrast, low power consumption, and fast response speed requirements of AR / VR.

[0041] Exemplary schematic diagrams of existing OLED devices are shown below. Figure 1 As shown, Figure 1 In the stacked structure shown, from bottom to top, the layers are: 2 (light-emitting layer), 3 (encapsulation layer), 4 (color filter layer), 5 (planarization layer), 6 (microlens layer), 7 (adhesive layer), and 8 (cover plate). The color filter layer 4 includes a blue filter, a green filter, and a red filter arranged sequentially. These filters, along with the white-light-emitting layer 2, work together to achieve color emission from the OLED device.

[0042] In the process of fabricating the color filter 43, since three colors of filters need to be made, the manufacturing process requires three coating, exposure, and development steps. For example, in the manufacturing process, the blue filter, red filter, and green filter are fabricated sequentially. This results in the red filter overlapping the already fabricated blue filter during fabrication, ultimately forming a red filter protrusion 41. Then, during the green filter fabrication, the green filter overlaps the already fabricated red and blue filters, ultimately forming a green filter protrusion 42. Due to the process, the existing red filter protrusion 41 and green filter protrusion 42 have a lens-like structure, and the final structure is as follows... Figure 1 As shown.

[0043] In this case, such as Figure 2 As shown, there will be a problem with side light crosstalk paths. Using green light (i.e....) Figure 2 The G ray in the middle is red light (i.e., Figure 2 R-rays and blue light (i.e., R-rays) and blue light (i.e. Figure 2 Taking B-ray crosstalk as an example, green light emitted from the green filter is deflected at a certain angle by the microlens sidewall located above the green filter before entering the wide viewing angle. Similarly, blue and red light emitted from the blue and red filters on both sides of the green filter are also deflected at a certain angle by the microlens sidewall located above the green filter before entering the wide viewing angle. This results in blue and red light being mixed in with the green light at a wide viewing angle, causing crosstalk and impure monochromatic color at a wide viewing angle. This affects the color shift of the display device at a wide viewing angle and reduces the user's visual experience.

[0044] Therefore, how to avoid crosstalk of light to improve the large viewing angle deviation of display devices is an urgent problem to be solved.

[0045] Based on this, see Figure 3 and Figure 4 This application provides a display substrate, comprising:

[0046] A substrate 1, wherein a light-emitting layer 2 is provided on one side of the substrate 1;

[0047] Color filter layer 4 is located on the side of the light-emitting layer 2 away from the substrate 1;

[0048] The control layer 9 is located on the side of the color filter layer 4 away from the substrate 1, and the control layer 9 includes a plurality of control protrusions 91 spaced apart;

[0049] The microlens layer 6 is located on the side of the color filter layer 4 away from the substrate 1, and the microlens layer 6 includes a plurality of microlenses 61 arranged in an array;

[0050] Wherein, on a plane perpendicular to the display substrate, the adjustment protrusion 91 includes a first plane 911 and a second plane 913, the first plane 911 and the second plane 913 intersect at an obtuse angle 914, and the orthographic projection of the vertex of the obtuse angle 914 on the substrate 1 at least partially overlaps with the orthographic projection of at least one of the microlenses 61 on the substrate 1.

[0051] Specifically, substrate 1 includes a substrate base and driving circuitry located on the substrate base. The substrate base can support and protect various components of the display substrate. The substrate base can be made of silicon-based materials, which are novel materials developed based on silicon, including but not limited to germanium-silicon, porous silicon, microcrystalline silicon, and other compound semiconductor materials heteroepitaxially formed on silicon substrate 1. The substrate base can also be formed of glass, quartz, ceramic, or flexible plastic materials. For example, when the substrate base is formed of a plastic material, it can be formed of polyimide (PI). The substrate base can be flexible, stretchable, foldable, bendable, and / or rollable, so the display substrate can also be flexible, stretchable, foldable, bendable, and / or rollable.

[0052] A driving circuit (not shown) is disposed on the substrate. The driving circuit may include a thin-film transistor (TFT) and a capacitor. The TFT is disposed on the substrate. The TFT can be a driving element of the display substrate. The TFT includes an active layer, a gate electrode, a source electrode, and a drain electrode.

[0053] A planarization layer is disposed on the thin-film transistor. The planarization layer is used to remove and / or flatten the steps in the aforementioned structure, thereby increasing the luminous efficiency of the light-emitting element to be formed thereon. At least some of the contact holes overlapping with the drain electrode are formed in the passivation layer.

[0054] The planarization layer may be formed from polyacrylate resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin and / or benzocyclobutene (BCB).

[0055] The light-emitting layer 2 is disposed on the planarization layer. The light-emitting layer 2 includes a first electrode layer, a light-emitting material layer, and a second electrode layer.

[0056] A first electrode layer is disposed on the planarization layer. This first electrode layer can be formed of a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium oxide (In₂O₃), or of a metal such as lithium (Li), calcium (Ca), lithium fluoride / calcium (LiF / Ca), lithium fluoride / aluminum (LiF / Al), aluminum (Al), silver (Ag), magnesium (Mg), or gold (Au). The first electrode layer is electrically connected to the drain electrode of the thin-film transistor via contact holes formed in the planarization layer, serving as the anode of the light-emitting element.

[0057] A light-emitting material layer is disposed on the first electrode layer. The light-emitting material layer may include a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer stacked sequentially. The hole injection layer is in contact with the first electrode layer, and the electron injection layer is in contact with the second electrode layer. Of course, in other exemplary embodiments of this application, the light-emitting material layer may only include a hole transport layer, a light-emitting material layer, and an electron transport layer. The light-emitting material layer may also have other structures, and its specific structure can be set as needed.

[0058] An encapsulation layer 3 is disposed on the side of the second electrode layer away from the substrate 1. The encapsulation layer 3 can be multilayered and may include organic and inorganic layers. The encapsulation layer 3 is disposed on the light-emitting side of the display substrate.

[0059] The color filter layer 4 is disposed on the side of the encapsulation layer 3 away from the substrate 1. The color filter layer 4 includes a plurality of color filters 43, which are arranged sequentially. For example, as shown... Figure 3 As shown, Figure 3 The color filter 43 containing B in the image can be a blue light filter. Figure 3 The color filter 43 containing G can be a green filter. Figure 3 The color filter 43 containing R can be a red light filter.

[0060] It is worth noting that the colors "R", "G", and "B" in the embodiments and accompanying drawings of this application are only used to exemplarily describe that the color filter layer 4 includes multiple color filters 43 of different colors, and are not intended to limit the arrangement of the multiple color filters 43 of different colors in the color filter layer 4. In specific implementations, the multiple color filters 43 of different colors can be arranged according to actual needs, and are not limited here.

[0061] When the light emitted by the light-emitting layer 2 is white, the white light emitted from the light-emitting device will form green light, blue light and red light after passing through the green light filter, blue light filter and red light filter. In this way, the color light emission of the OLED device can be realized by the cooperation of the color filter 43 and the light-emitting layer 2 that emits white light.

[0062] The control layer 9 is located on the side of the color filter layer 4 away from the substrate 1. The control layer 9 includes a plurality of spaced control protrusions 91, with a control interval 92 between two adjacent control protrusions 91. The orthographic projection of the control interval 92 on the color filter layer 4 lies within a color filter 43. Light emitted from the color filter 43 can pass through the control interval 92 and travel directly in the direction away from the substrate 1 (i.e., the light emission direction of the display substrate). Figure 3 The light emitted from the color filter 43 (in the NM direction) will not be affected by the modulation protrusion 91.

[0063] For ease of description later, in this embodiment, the color filter 43 corresponding to the adjustment interval 92 is referred to as the target light filter, and the light emitted from the target light filter and then emitted directly away from the substrate 1 after passing through the adjustment interval 92 is referred to as the target light (i.e., Figure 4 (QW rays and ER rays in the image).

[0064] On a plane perpendicular to the display substrate, the control protrusion 91 includes a first plane 911 and a second plane 913. The first plane 911 is the plane of the control protrusion 91 away from the substrate 1, and the second plane 913 is the plane containing at least one sidewall of the control protrusion 91. Specifically, for a control protrusion 91, the second plane 913 can be the plane containing one sidewall of the control protrusion 91, the plane containing two opposite sidewalls, or the plane containing all sidewalls.

[0065] The first plane 911 and the second plane 913 intersect at an obtuse angle 914. The orthographic projection of the vertex of the obtuse angle 914 onto the substrate 1 at least partially overlaps with the orthographic projection of at least one of the microlenses 61 onto the substrate 1. This causes the incident light entering the control protrusion 91 to be refracted at the interface of the control protrusion 91, thereby effectively controlling the optical circuit of the incident light. Consequently, the corresponding outgoing light can enter the color filter layer 4 or exit from both sides of the display substrate. This prevents the outgoing light from the control protrusion 91 from shining in the light-emitting direction of the display substrate, and thus prevents the outgoing light corresponding to the incident light entering the control protrusion 91 from affecting the front light emission of the display substrate, avoiding light crosstalk.

[0066] like Figure 4 As shown, the incident light is TY and the outgoing light is OP. At this time, the control protrusion 91 can control the outgoing light OP corresponding to the incident light TY, so that the outgoing light OP exiting the control protrusion 91 can directly enter the color filter layer 4.

[0067] like Figure 5As shown, the incident light is AS and the outgoing light is DF. At this time, the control protrusion 91 can control the outgoing light DF corresponding to the incident light AS that enters it, so that the outgoing light DF exiting the control protrusion 91 is emitted from the side wall of the control protrusion 91 in a direction parallel to the color filter layer 4, and then emitted from both sides of the display substrate.

[0068] Thus, at least a portion of the side-incident light entering from the sidewall of the control protrusion 91 will only enter the color filter layer 4 or exit from both sides of the display substrate. The exiting light will not pass through the control protrusion 91 and exit from the top surface of the control protrusion 91. This ensures that the exiting light corresponding to at least a portion of the side-incident light entering the control protrusion 91 will not cause crosstalk to the target light normally emitted from the control interval 92 in the direction away from the substrate 1, and will not affect the large viewing angle color deviation of the target light, thereby improving the user's visual experience.

[0069] In this application, by setting a control layer 9 on the side of the color filter layer 4 away from the substrate 1, and controlling the intersection of the first plane 911 and the second plane 913 of the control protrusion 91 at an obtuse angle 914, the orthographic projection of the vertex of the obtuse angle 914 on the substrate 1 at least partially overlaps with the orthographic projection of at least one of the microlenses 61 on the substrate 1, the control protrusion 91 can control at least part of the emitted light emitted from the control protrusion 91 to enter the color filter layer 4 or to exit from both sides of the display substrate. Thus, the emitted light will not pass through the control protrusion 91 and exit from the top surface of the control protrusion 91, so that the emitted light emitted from the control protrusion 91 will not cause crosstalk to the light emitted normally from the interval between two adjacent control protrusions 91, and will not affect the large viewing angle color deviation of the light, thereby improving the large viewing angle color deviation and enhancing the user's visual experience.

[0070] In some embodiments, see continue to see Figure 3 and Figure 4 A planarization layer 5 is provided between the control layer 9 and the microlens layer 6. The planarization layer 5 completely covers the color filter layer 4 and the control layer 9. The refractive index of the control layer 9 is greater than that of the planarization layer 5, so as to control the optical path of the incident light into the control protrusion 91, so that the corresponding outgoing light enters the color filter layer 4 or exits from both sides of the display substrate.

[0071] Specifically, such as Figure 4 As shown, since the refractive index of the control layer 9 is different from that of the planarization layer 5, the incident light TY injected into the control layer will undergo a first refraction at the injection interface. The refracted light YO after the first refraction will undergo a second refraction at the exit interface when it exits the control protrusion 91. The refracted light OP after the second refraction is the final exit light.

[0072] Since the refractive index of the control layer 9 is greater than that of the planarization layer 5, during the first refraction, the incident light TY enters the control layer 9 with a higher refractive index from the planarization layer 5 with a lower refractive index. At this time, the angle of refraction is smaller than the angle of incidence, causing the light ray YO after the first refraction to bend closer to the substrate 1 (if the first refraction does not occur, the incident light TY will exit along its extended dotted line direction). During the second refraction, the incident light is the refracted light YO from the first refraction. The refracted light YO enters the planarization layer 5 with a lower refractive index from the control layer 9 with a higher refractive index. At this time, the angle of refraction is greater than the angle of incidence, causing the light ray OP after the second refraction to bend closer to the substrate 1 (if the second refraction does not occur, the refracted light YO will exit along its extended dotted line direction). The light ray OP after the second refraction is the outgoing light corresponding to the incident light TY. The outgoing light TY directly enters the color filter layer 4, instead of exiting from the top of the control protrusion 91 along the initial direction.

[0073] See also Figure 5 As shown, similar to the above process, due to the occurrence of two refractions, the control protrusion 91 controls the direction of the outgoing light DF corresponding to the incident light AS, so that the outgoing light DF is emitted from both sides of the control protrusion 91, instead of being emitted in the direction away from the control protrusion 91 along the initial direction.

[0074] After two refractions, the adjustment protrusion 91 modulates the optical path of the incident light, changing the original direction of the outgoing light and causing it to bend closer to the substrate 1, thus directly entering the color filter layer 4 and avoiding crosstalk between the outgoing light and the target light.

[0075] For example, the refractive index of the planarization layer 5 is 1.56 to 1.6, and the refractive index of the control layer 9 is 1.7 to 1.8.

[0076] In this application, by limiting the relationship between the refractive index of the control protrusion 91 and the refractive index of the planarization layer 5, the incident light entering the control protrusion 91 from the side wall of the control protrusion 91 undergoes two refractions, and both refractions cause the refracted light to bend towards the substrate 1, so that the final outgoing light can directly enter the color filter layer 4 or exit from both sides of the display substrate, avoiding crosstalk between the outgoing light and the target light and improving the large viewing angle color shift.

[0077] In some embodiments, see Figure 3 and Figure 6 The ratio of the thickness of the control layer 9 to the thickness of the planarization layer 5 is 0.5:1 to 1:1.

[0078] Specifically, when the ratio of the thickness of the control layer 9 to the thickness of the planarization layer 5 is 0.5:1 to 1:1, it can be ensured that most of the incident light rays entering from the sidewall of the control protrusion 91 are deflected so that they enter the color filter layer 4, ensuring that most of the incident light rays entering from the sidewall do not cause crosstalk to the target light, thus improving the large viewing angle color shift.

[0079] When the ratio of the thickness of the control layer 9 to the thickness of the planarization layer 5 is less than 0.5:1, the thickness of the control protrusion 91 is too small, so that most of the incident light rays entering from its sidewall can directly exit from the gap between the control layer 9 and the upper surface of the planarization layer 5. Thus, the control protrusion 91 cannot control the incident light rays entering from the sidewall, and therefore cannot effectively avoid crosstalk.

[0080] For example, the ratio of the thickness of the control layer 9 to the thickness of the planarization layer 5 can be 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, etc.

[0081] like Figure 6 When the ratio of the thickness of the control layer 9 to the thickness of the planarization layer 5 is 1:1, there is no gap between the first plane 911 of the control protrusion 91 and the upper surface of the planarization layer 5. This ensures that all incident light entering from the side wall will pass through the control protrusion 91 and its optical path will be controlled, thus effectively avoiding crosstalk.

[0082] In some embodiments, the regulating protrusion 91 includes a plurality of sidewalls, and at least two opposite sidewalls of the regulating protrusion 91 are inclined surfaces.

[0083] Specifically, when both opposite sidewalls of the control protrusion 91 are inclined surfaces, since the inclination angle of the inclined surfaces is constant, all light rays passing through this sidewall will be refracted at this sidewall, which can effectively and regularly control the optical path of all light rays. Specifically, when both opposite sidewalls of the control protrusion 91 are inclined surfaces, the incident light entering one sidewall undergoes a first refraction at that sidewall. The refracted light after the first refraction undergoes a second refraction at the other sidewall opposite to that sidewall. The refracted light after the second refraction is the outgoing light ray. After the second refraction, the outgoing light ray directly enters the color filter layer 4, avoiding crosstalk between the outgoing light ray and the target light ray, thereby improving the large field of view color shift.

[0084] Compared to curved surfaces, inclined surfaces provide more regular and uniform control over light. Therefore, when both sides of the control protrusion 91 are inclined surfaces, the presence of the two inclined surfaces can regularly and uniformly control the light path of the incident light entering the control protrusion 91, so that all incident light undergoes two refractions on the side walls of the control protrusion 91. Moreover, the refraction on both sides will cause the refracted light to be deflected towards the substrate 1, thereby causing all the incident light to be directly deflected into the color filter layer 4, avoiding crosstalk between the outgoing light and the target light, thus improving the large field of view color shift. The existing lens-like structure with adjustable protrusions 91, due to the curved sidewalls of the lens-like structure, has different curvatures that affect the light path of incident light differently. As a result, it cannot regularly control the incident light or deflect most of the outgoing light, causing most of the outgoing light to still exit from the light-emitting direction. Ultimately, the outgoing light will cause crosstalk to the target light, resulting in impure monochromatic color at a large viewing angle, affecting the color shift of the display device at a large viewing angle, and reducing the user's visual experience.

[0085] In some embodiments, such as Figure 7 As shown, the adjustment protrusion 91 also includes a third plane 912, which is the plane connecting the adjustment protrusion 91 and the color filter layer 4. The orthographic projection of the first plane 911 on the substrate 1 is located within the orthographic projection of the third plane 912 on the substrate 1.

[0086] Specifically, both the first plane 911 and the third plane 912 are planes or inclined planes, so that the top surface, bottom surface and sidewalls of the regulating protrusion 91 are all planes or inclined planes. Furthermore, the orthographic projection of the first plane 911 on the base 1 lies within the orthographic projection of the third plane 912 on the base 1, thus making the regulating protrusion 91 a trapezoidal structure.

[0087] The trapezoidal structure of the control protrusion 91 causes the distance between the two opposite sidewalls of the control protrusion 91 to gradually increase along the direction from the planar layer 5 to the substrate 1. At this time, the tilt direction of the sidewall of the control protrusion 91 is fixed. Such a tilt direction can ensure that the incident light entering from one sidewall can be refracted after the first refraction and then directed to the other sidewall of the control protrusion 91. Then, a second refraction occurs at the other sidewall, and the light after the second refraction can enter the color filter layer 4.

[0088] However, if the orthographic projection of the third plane 912 on the base 1 lies within the orthographic projection of the first plane 911 on the base 1, that is, if the protrusion 91 is adjusted to be an inverted trapezoidal structure, such as Figure 8The optical path diagram shown shows that, since the tilt direction of the sidewall of the control protrusion 91 changes at this time, although the incident light will also be refracted for the first time on the sidewall of the control protrusion 91, the second refraction may occur on the first plane 911 of the control protrusion 91, so that the final outgoing light still comes out from the top of the control protrusion 91, causing the outgoing light to still cause crosstalk to the target light.

[0089] In this application, by controlling the morphology of the adjustment protrusion 91, the adjustment protrusion 91 can regularly regulate the incident light rays entering from its sidewall, ensuring that most of the outgoing light rays enter the color filter layer 4 and do not entangle with the target light rays, thereby greatly improving the color shift at a large viewing angle. However, the adjustment protrusion 91 of the lens-like structure formed by existing processes has a curved surface with different curvatures at different locations. These different curvatures have different effects on the optical path of the incident light rays, making it impossible to regularly regulate the incident light rays or deflect most of the outgoing light rays. As a result, most of the outgoing light rays still exit from the light-emitting direction, ultimately causing crosstalk between the outgoing light rays and the target light rays, resulting in impure monochromatic color shift at a large viewing angle, affecting the color shift of the display device at a large viewing angle, and reducing the user's visual experience.

[0090] In some embodiments, such as Figure 9 As shown, the angles between the two opposite sidewalls of at least one of the regulating protrusions 91 and the third plane 912 are a first angle and a second angle, respectively, and both the first angle and the second angle are 50° to 70°.

[0091] Specifically, the first included angle is Figure 9 As shown in the figure, the second included angle is Figure 9 The β shown is based on... Figure 9 As can be seen from the optical path diagram shown,

[0092]

[0093] Where e is the deflection angle of the ray, and n is the refractive index of the convex 91.

[0094] Specifically, taking an angle of 60° for both the first and second included angles, an incident angle of 45° to 85°, and a refractive index n of 1.7 for the adjustable protrusion 91 as an example, the final light deflection angle e is calculated to be 63° to 83° based on the above formula. When the light deflection angle e is within this range, the emitted light can directly enter the color filter layer 4.

[0095] After conducting numerous simulation experiments, the inventors calculated that when both the first and second included angles are 50° to 70°, most of the incident light rays can be directly incident into the color filter layer 4, thus avoiding crosstalk to the target light rays.

[0096] In some embodiments, the ratio of the area of ​​the orthographic projection of the adjustment interval 92 on the substrate 1 to the area of ​​the orthographic projection of the corresponding color filter 43 on the substrate 1 is 1:10 to 9:10.

[0097] Specifically, since the adjustment protrusion 91 will adjust the light entering it, when the light emitted from the color filter 43 corresponding to the adjustment interval 92 enters the adjustment protrusion 91, the adjustment protrusion 91 will also adjust the optical path of the light, so that the corresponding outgoing light cannot be emitted from the top of the flat layer 5, thus losing the target light emitted from the color filter 43.

[0098] Therefore, in this application, the ratio of the area of ​​the orthographic projection of the control interval 92 on the substrate 1 to the area of ​​the orthographic projection of the corresponding color filter 43 on the substrate 1 is controlled to be 1:10 to 9:10. At this time, the size of the control interval 92 and the control protrusion 91 are both appropriate. The control interval 92 of appropriate size can ensure that most of the light emitted from the color filter 43 corresponding to the control interval 92 can pass directly through the control interval 92 and exit the planarization layer 5. Thus, the setting of the control protrusion 91 will not have a significant impact on the light emitted from the color filter 43 and will not affect the wide viewing angle display of the target light. At the same time, the control protrusion 91 of appropriate size can control the light emitted from other color filters 43 so that the outgoing light corresponding to the incident light emitted by other color filters can directly enter the color filter layer 4, avoiding crosstalk to the target light.

[0099] When the ratio of the area of ​​the orthographic projection of the control interval 92 on the substrate 1 to the area of ​​the orthographic projection of the corresponding color filter 43 on the substrate 1 is less than 1:10, the control interval 92 is too small. At this time, most of the light emitted from the color filter 43 corresponding to the control interval 92 cannot pass directly through the control interval 92 and exit the planarization layer 5. Instead, it enters the control protrusion 91, which refracts the light, causing the final emitted light to be unable to exit from the top of the planarization layer 5, thus reducing the amount of light emitted from the target light.

[0100] When the ratio of the area of ​​the orthographic projection of the control interval 92 on the substrate 1 to the area of ​​the orthographic projection of the corresponding color filter 43 on the substrate 1 is greater than 9:10, the control interval 92 is too large and the control protrusion 91 is too small. At this time, although the amount of light emitted by the target light can be ensured, the control protrusion 91, which is too small, cannot effectively control the light emitted by other color filters, so that crosstalk cannot be effectively avoided.

[0101] Specifically, see Figure 10The control interval 92 allows most of the light emitted by its corresponding color filter 43 to pass directly through the control interval 92 and exit the flat layer 5, while the control protrusion 91 can effectively control the light emitted by other color filters 43 to avoid crosstalk.

[0102] In some embodiments, the orthographic projection of each of the control protrusions 91 on the substrate 1 partially overlaps with the orthographic projection of the two adjacent color filters 43 on the substrate 1, and the control protrusions 91 and one of the color filters 43 are made of the same material.

[0103] Specifically, in the actual manufacturing process, the adjustment protrusion 91 and one of the color filters 43 are made of the same material and using the same manufacturing process. In this way, when manufacturing the display substrate described in this application, no additional process is required. It can be achieved on the basis of the existing process, which not only achieves the technical effect of preventing crosstalk and improving the color deviation at large viewing angles, but also avoids adding processes and saves manufacturing costs.

[0104] In some embodiments, such as Figure 11 and Figure 12 As shown, the plurality of color filters 43 include a first color filter 431, a second color filter 432, and a third color filter 433; when the orthographic projection of the adjustment protrusion 91 on the substrate 1 coincides with the orthographic projection of the first color filter 431 on the substrate 1, there is a gap 51 between the first plane 911 and the top surface of the flat layer 5 away from the substrate 1, so that at least a portion of the light emitted from the first color filter 431 passes directly through the gap 51 and exits the flat layer 5.

[0105] Furthermore, both the first plane 911 and the second plane 913 near the first color filter 431 are inclined relative to the horizontal plane (i.e., a plane parallel to the substrate 1), wherein the inclination direction is from the gap 51 toward the first color filter 431. When the first plane 911 is inclined in this way, some light emitted from the first color filter 431 can directly pass through the gap 51 and exit the flat layer 5. This ensures that some of the first color light is emitted in the wide-viewing-angle white light of the target light, thus supplementing the brightness of the first color light in the wide-viewing-angle white light and improving the horizontal angle deviation at wide viewing angles. For example, the first color can be blue, the second color can be green, and the third color can be red.

[0106] In practical implementation, since the human eye sees the best effect and the display effect is best when the emitted light is mixed with some blue light, in this application, the first plane 911 of the control protrusion 91 and the second plane 913 near the blue light filter are set as inclined planes with a specific tilt direction, so that some blue light can be emitted directly. This can improve the display effect by mixing some blue light into the emitted light with a large viewing angle of the target light.

[0107] Meanwhile, compared to red and green light, blue light has a more severe brightness decay. Therefore, in this application, the first plane 911 of the control protrusion 91 and the second plane 913 near the blue light filter are set as inclined planes with a specific tilt direction, so that some blue light can be emitted directly. This can also increase the amount of blue light emitted and slow down the brightness decay of blue light.

[0108] like Figure 13 As shown, simulation experiments have shown that setting the first plane 911 of the control protrusion 91 and the second plane 913 near the blue light filter as inclined planes with a specific tilt direction can significantly improve the attenuation of blue light.

[0109] Further as Figure 14 As shown in the simulation experiment, setting the first plane 911 of the control protrusion 91 and the second plane 913 near the blue light filter as inclined planes with a specific tilt direction can also significantly improve the effect of large viewing angle color deviation. Figure 14 As shown, compared to the Du′v′ value (i.e. color deviation value) of white light before improvement, the Du′v′ value of white light after improvement has a significant increase at the 0.025 position. This indicates that setting the first plane 911 of the control protrusion 91 and the second plane 913 near the blue light filter as a sloped surface with a specific tilt direction can not only improve the brightness attenuation of blue light, but also significantly improve the color deviation angle at large viewing angles, thereby improving the display effect.

[0110] In this application, while suppressing the brightness attenuation of red and green light under the same wide viewing angle, the brightness of blue light is increased to improve the target bias under wide viewing angle. Similarly, any component of red, blue and green light in the wide viewing angle can be similarly adjusted according to the specific situation so that the brightness attenuation of red, blue and green light under wide viewing angle is close to the same.

[0111] This application also provides a method for preparing a display substrate, comprising:

[0112] A substrate 1 is provided, and a light-emitting layer 2 is formed on one side of the substrate 1;

[0113] A color filter layer 4 is prepared on the side of the light-emitting layer 2 away from the substrate 1;

[0114] A control layer 9 is prepared on the side of the color filter layer 4 away from the substrate 1. The control layer 9 includes a plurality of control protrusions 91 spaced apart.

[0115] A microlens layer 6 is fabricated on the side of the color filter layer 4 away from the substrate 1, and the microlens layer 6 includes a plurality of microlenses 61 arranged in an array;

[0116] Wherein, on a plane perpendicular to the display substrate, the adjustment protrusion 91 includes a first plane 911 and a second plane 913, the first plane 911 and the second plane 913 intersect at an obtuse angle 914, and the orthographic projection of the vertex of the obtuse angle 914 on the substrate 1 at least partially overlaps with the orthographic projection of at least one of the microlenses 61 on the substrate 1.

[0117] Specifically, when preparing the display substrate described in this application, there is no need to add extra preparation steps on the basis of the existing process. Only the morphology of the control protrusion 91 needs to be adjusted under the premise of the existing preparation process so that the control protrusion 91 can control the light output direction of at least part of the incident light injected into the control protrusion 91, thereby improving the large viewing angle piezoresis and avoiding crosstalk in the large viewing angle.

[0118] This application provides a display device, including the display substrate described in any of the above embodiments or the display substrate prepared by the preparation method described in any of the above embodiments.

[0119] The display device can be a product with image display function, such as: monitor, television, billboard, digital photo frame, laser printer with display function, telephone, mobile phone, personal digital assistant (PDA), digital camera, portable camcorder, viewfinder, navigator, vehicle, large wall, home appliance, information query equipment (such as business query equipment of e-government, bank, hospital, power and other departments, monitor, etc.).

[0120] The display device has the technical effects described in any of the above embodiments, which will not be elaborated here.

[0121] It should be noted that the above description describes some embodiments of this disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0122] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this disclosure as described above, which are not provided in detail for the sake of brevity.

[0123] This disclosure is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A display substrate, characterized in that, include: A substrate, wherein a light-emitting layer is provided on one side of the substrate; A color filter layer is located on the side of the light-emitting layer away from the substrate; A control layer is located on the side of the color filter layer away from the substrate, and the control layer includes a plurality of control protrusions spaced apart. A microlens layer is located on the side of the color filter layer away from the substrate, and the microlens layer includes a plurality of microlenses arranged in an array; Wherein, on a plane perpendicular to the display substrate, the adjustment protrusion includes a first plane and a second plane, the first plane and the second plane intersect at an obtuse angle, and the orthographic projection of the vertex of the obtuse angle on the substrate at least partially overlaps with the orthographic projection of at least one of the microlenses on the substrate.

2. The display substrate according to claim 1, characterized in that, A planarization layer is also provided between the control layer and the microlens layer. The planarization layer completely covers the color filter layer and the control layer. The refractive index of the control layer is greater than that of the planarization layer.

3. The display substrate according to claim 2, characterized in that, The ratio of the thickness of the control layer to the thickness of the planarization layer is 0.5:1 to 1:

1.

4. The display substrate according to claim 2, characterized in that, The regulating protrusion includes multiple sidewalls, and at least two opposite sidewalls of the regulating protrusion are inclined surfaces.

5. The display substrate according to claim 4, characterized in that, The control protrusion further includes a third plane, which is the plane connecting the control protrusion and the color filter layer. The orthographic projection of the first plane on the substrate is located within the orthographic projection of the third plane on the substrate.

6. The display substrate according to claim 5, characterized in that, The angles between the two opposite sidewalls of the regulating protrusion and the third plane are the first angle and the second angle, respectively, and both the first angle and the second angle are 50° to 70°.

7. The display substrate according to claim 2, characterized in that, The color filter layer includes multiple color filters, and the interval between two adjacent control protrusions is the control interval. The orthographic projection of the control interval on the substrate is located within the orthographic projection of one of the color filters on the substrate.

8. The display substrate according to claim 7, characterized in that, The ratio of the area of ​​the orthographic projection of the adjustment interval on the substrate to the area of ​​the orthographic projection of the corresponding color filter on the substrate is 1:10 to 9:

10.

9. The display substrate according to claim 7, characterized in that, The orthographic projection of each of the aforementioned adjustment protrusions on the substrate partially overlaps with the orthographic projections of the two adjacent color filters on the substrate, and the adjustment protrusions and one of the color filters are made of the same material.

10. The display substrate according to claim 7, characterized in that, The plurality of color filters include a first color filter; when the orthographic projection of the control protrusion on the substrate coincides with the orthographic projection of the first color filter on the substrate, there is a gap between the first plane and the top surface of the flat layer away from the substrate, so that at least a portion of the light emitted from the first color filter passes directly through the gap and exits the flat layer.

11. The display substrate according to claim 10, characterized in that, Both the first plane and the second plane near the first color filter are inclined relative to the horizontal plane, wherein the direction of the inclination is from the interval toward the first color filter.

12. A display device, characterized in that, Includes the display substrate as described in any one of claims 1 to 11.

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