Display substrate and display device

Abstract

The embodiment of the invention discloses a display substrate and a display device. In a specific embodiment, the display substrate comprises a substrate; the plurality of pixel units are arranged on the substrate, and each pixel unit comprises a first pixel unit and a second pixel unit; the first pixel unit comprises at least one first light-emitting device, the second pixel unit comprises a second light-emitting device, and the area of the orthographic projection of the second light-emitting device on the substrate is larger than that of the orthographic projection of the first light-emitting device on the substrate; the first lens layer is located on the side, away from the substrate, of the pixel unit, the second lens layer is located on the side, away from the substrate, of the first lens layer, the first lens layer comprises a plurality of first lens sets, each first lens set comprises a plurality of first lenses, and the second lens layer comprises a plurality of second lenses; the orthographic projection of a second lens on the substrate covers the orthographic projection of a first lens group on the substrate, and the orthographic projection of a first lens group on the substrate covers the orthographic projection of a first light-emitting device on the substrate.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and more specifically, to a display substrate and a display device. Background Art

[0002] At present, there is a demand for using an anti-peeping display screen that can be switched to an anti-peeping display mode in some scenarios. For example Figure 1 As shown, many vehicles are currently equipped with multiple touch screens, including an instrument panel display (IDU) 101, a central control display (CID) 102, a co-pilot display (CDD) 103, etc., wherein, for driving safety, the co-pilot display 103 needs to be switched to a narrow-viewing anti-peeping display mode during driving to prevent the driver from being affected by the display content of the co-pilot display 103, which is conducive to the driver being able to concentrate on driving. The inventors have found that the anti-peeping display often has dark corners in the anti-peeping display mode. For example, the roughly rectangular co-pilot display 103 often has dark corners in the anti-peeping display mode, which affects the display effect. Summary of the invention

[0003] The purpose of the present disclosure is to provide a display substrate and a display device to solve at least one of the problems existing in the prior art.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A first aspect of the present disclosure provides a display substrate, comprising:

[0006] substrate;

[0007] A plurality of pixel units are arranged on the substrate, each of the pixel units includes a first pixel unit and a second pixel unit; the first pixel unit includes at least one first light-emitting device, the second pixel unit includes a second light-emitting device, and an area of ​​a positive projection of the second light-emitting device on the substrate is larger than an area of ​​a positive projection of the first light-emitting device on the substrate;

[0008] A first lens layer located at a side of the pixel unit away from the substrate and a second lens layer located at a side of the first lens layer away from the substrate, wherein the first lens layer includes a plurality of first lens groups, the first lens group includes a plurality of first lenses, the second lens layer includes a plurality of second lenses, an orthographic projection of the second lens on the substrate covers an orthographic projection of the first lens group on the substrate, and an orthographic projection of the first lens group on the substrate covers an orthographic projection of the first light-emitting device on the substrate.

[0009] Optionally, in the first lens group, adjacent first lenses are in contact with each other.

[0010] Optionally, the first lens group includes four first lenses.

[0011] Optionally, the aspect ratio of the first lens is greater than 1.

[0012] Optionally, the display substrate further includes a third lens layer located between the first lens layer and the second lens layer, the third lens layer includes a plurality of third lens groups, the third lens group includes a plurality of third lenses, and an orthographic projection of one of the third lenses on the substrate coincides with an orthographic projection of one of the first lenses on the substrate.

[0013] Optionally, the first lens and the third lens have the same size.

[0014] Optionally, the first lens and the third lens are convex lenses respectively.

[0015] Optionally, the second lens is a convex lens.

[0016] A second aspect of the present disclosure provides a display device, comprising the display substrate provided by the first aspect of the present disclosure.

[0017] Optionally, the display device includes a co-pilot display screen.

[0018] The beneficial effects of the present disclosure are as follows:

[0019] The technical solution disclosed in the present invention, by setting a first lens group corresponding to each first light-emitting device, and setting the first lens group to include multiple first lenses, can split the display light beam emitted by the first light-emitting device into multiple sub-beams, and then form a non-rotationally symmetric light spot on the surface of the display screen after being evenly lighted by the second lens, thereby effectively improving the phenomenon of dark corners of the anti-peeping display screen in the anti-peeping display mode in which only the first pixel unit emits light, improving the brightness uniformity of the anti-peeping display screen in the anti-peeping display mode, and optimizing the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific implementation methods of the present disclosure are further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 Schematic diagram showing the distribution of in-vehicle display screens.

[0022] Figure 2 2(a) shows a schematic diagram of the display of the co-pilot display screen in a shared display mode from the perspective of the co-pilot seat, and 2(b) shows a schematic diagram of the display of the co-pilot display screen in an anti-peeping display mode from the perspective of the co-pilot seat.

[0023] Figure 3 A schematic diagram showing the display effect of the co-pilot display screen in anti-peep display mode from the co-pilot seat perspective.

[0024] Figure 4 A schematic diagram showing the pixel arrangement of a display substrate provided in an embodiment of the present disclosure is shown.

[0025] Figure 5 A cross-sectional schematic diagram of a display substrate provided by an embodiment of the present disclosure is shown.

[0026] Figure 6 A schematic diagram showing a first lens group in a display substrate provided in an embodiment of the present disclosure.

[0027] Figure 7 Another cross-sectional schematic diagram of a display substrate provided by an embodiment of the present disclosure is shown.

[0028] Figure 8 Show Figure 7 A schematic diagram of the light path of display light emitted by the first light-emitting device in the display substrate is shown. DETAILED DESCRIPTION

[0029] The terms “on”, “formed on” and “disposed on” in the present disclosure may mean that one layer is directly formed or disposed on another layer, or may mean that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers.

[0030] It should be noted that, although the terms "first", "second", etc. may be used herein to describe various parts, components, elements, regions, layers and / or parts, these parts, components, elements, regions, layers and / or parts should not be limited by these terms. Instead, these terms are used to distinguish one part, component, element, region, layer and / or part from another. Thus, for example, the first part, first member, first element, first region, first layer and / or first part discussed below may be referred to as the second part, second member, second element, second region, second layer and / or second part without departing from the teachings of the present disclosure.

[0031] In the present disclosure, unless otherwise specified, the term "same-layer arrangement" used refers to two layers, parts, components, elements or parts that can be formed by the same preparation process (such as a patterning process, etc.), and the two layers, parts, components, elements or parts are generally formed of the same material. For example, two or more functional layers are arranged in the same layer, which means that these functional layers arranged in the same layer can be formed using the same material layer and the same preparation process, thereby simplifying the preparation process of the display substrate.

[0032] In the present disclosure, unless otherwise specified, the expression "patterning process" generally includes steps such as photoresist coating, exposure, development, etching, photoresist stripping, etc. The expression "one-time patterning process" means a process of forming patterned layers, components, members, etc. using one mask.

[0033] At present, there is a demand for anti-peeping display screens that can be switched to anti-peeping display mode in some scenarios. For example, for driving safety, Figure 1 The passenger display screen 103 shown needs to be switched to a narrow viewing angle anti-peeping display mode to prevent the driver from being distracted. The inventors have found that the anti-peeping display screen often has dark corners in the anti-peeping display mode. For example, the roughly rectangular passenger display screen 103 often has dark corners in the anti-peeping display mode, which affects the display effect.

[0034] The invention further studies the reason and takes the roughly rectangular co-pilot display screen 103 as an example, which includes multiple pixel units, including, for example, red pixel units, green pixel units and blue pixel units. The red pixel units include red anti-peep pixel units and red shared pixel units, the green pixel units include green anti-peep pixel units and green shared pixel units, and the blue pixel units include blue anti-peep pixel units and blue shared pixel units. Among them, the display light viewing angle of the red shared pixel unit is greater than that of the red anti-peeping pixel unit, the display light viewing angle of the green shared pixel unit is greater than that of the green anti-peeping pixel unit, and the display light viewing angle of the blue shared pixel unit is greater than that of the blue anti-peeping pixel unit. When switching to the shared display mode, the red shared pixel unit, the green shared pixel unit and the blue shared pixel unit are controlled to emit display light for display, or the red shared pixel unit, the red anti-peeping pixel unit, the green shared pixel unit, the green anti-peeping pixel unit, the blue shared pixel unit and the blue anti-peeping pixel unit are controlled to emit display light for display, and both the co-pilot seat and the driver's seat can see the display content of the co-pilot display screen 103. When switching to the anti-peeping display mode, the red anti-peeping pixel unit, the green anti-peeping pixel unit and the blue anti-peeping pixel unit are controlled to emit display light for display, and only the co-pilot seat can see the display content of the co-pilot display screen 103.

[0035] The inventors have found that, for example, the method comprising 2(a) and 2(b) Figure 2 and Figure 3 As shown, from the perspective of the co-pilot seat, the roughly rectangular co-pilot display screen 103 often has dark corners in the anti-peeping display mode. Combined with the above structural analysis of the co-pilot display screen, the inventor believes that this is because in the display light emitted by the anti-peeping pixel unit, the attenuation curve of the display light in each direction as the viewing angle changes is rotationally symmetric with the center of the anti-peeping pixel unit as the axis, and the attenuation curve of the display light of the co-pilot display screen 103 in the anti-peeping display mode as the viewing angle changes is symmetric in all directions. When the co-pilot display screen 103 is in the anti-peeping display mode, the brightness attenuation of the four corners is larger, resulting in the dark corners.

[0036] In view of this, an embodiment of the present disclosure provides a display substrate, comprising

[0037] substrate;

[0038] A plurality of pixel units are arranged on the substrate, each of the pixel units includes a first pixel unit and a second pixel unit; the first pixel unit includes at least one first light-emitting device, the second pixel unit includes a second light-emitting device, and an area of ​​a positive projection of the second light-emitting device on the substrate is larger than an area of ​​a positive projection of the first light-emitting device on the substrate;

[0039] A first lens layer located at a side of the pixel unit away from the substrate and a second lens layer located at a side of the first lens layer away from the substrate, wherein the first lens layer includes a plurality of first lens groups, the first lens group includes a plurality of first lenses, the second lens layer includes a plurality of second lenses, an orthographic projection of the second lens on the substrate covers an orthographic projection of the first lens group on the substrate, and an orthographic projection of the first lens group on the substrate covers an orthographic projection of the first light-emitting device on the substrate.

[0040] The display substrate provided in this embodiment can divide the display light beam emitted by the first light-emitting device into multiple sub-beams by setting a first lens group corresponding to each first light-emitting device, and setting the first lens group to include multiple first lenses, and then form a non-rotationally symmetric light spot on the surface of the display screen after being uniformed by the second lens, such as a rectangular light spot, which effectively improves the dark corner phenomenon of the anti-peeping display screen in the anti-peeping display mode in which only the first pixel unit serving as the anti-peeping pixel unit emits light, improves the brightness uniformity of the anti-peeping display screen in the anti-peeping display mode, and optimizes the display effect.

[0041] In a specific example, the privacy display screen is a substantially rectangular shape, for example Figure 1 Taking the co-pilot display screen 103 as an example,

[0042] Figure 4 FIG. 4 shows the pixel arrangement of the display substrate provided in this embodiment. Figure 5 for Figure 4 BB cross-section diagram, for example Figure 4 and Figure 5 As shown, the display substrate provided in this embodiment includes a substrate 511 and a plurality of pixel units arranged on the substrate 511, and the plurality of pixel units include, for example, a red pixel unit 401, a green pixel unit 402 and a blue pixel unit 403:

[0043] The red pixel unit 401 includes a first red pixel unit as a red anti-peeping pixel unit and a second red pixel unit as a red shared pixel unit, the first red pixel unit includes a plurality of first red light-emitting devices 4011 corresponding to a plurality of red anti-peeping pixels, and the second red pixel unit includes a second red light-emitting device 4012 corresponding to a red shared pixel;

[0044] The green pixel unit 402 includes a first green pixel unit as a green anti-peeping pixel unit and a second green pixel unit as a green shared pixel unit, the first green pixel unit includes a plurality of first green light emitting devices 4021 corresponding to a plurality of green anti-peeping pixels, and the second green pixel unit includes a second green light emitting device 4022 corresponding to a green shared pixel;

[0045] The blue pixel unit 403 includes a first blue pixel unit as a blue anti-peep pixel unit and a second blue pixel unit as a blue shared pixel unit. The first blue pixel unit includes a plurality of first blue light-emitting devices 4031 corresponding to a plurality of blue anti-peep pixels, and the second blue pixel unit includes a second blue light-emitting device 4032 corresponding to a blue shared pixel.

[0046] It should be noted that Figure 4 The pixel arrangement of the display substrate shown is only an example, and the pixel arrangement position is not specifically limited in this embodiment.

[0047] For example Figure 5 As shown, the display substrate provided in this example includes a display backplane 510 including a substrate 511, a touch function layer 520, a light adjustment layer 530 and a cover plate 540. Figure 4 BB cross-section diagram Figure 5 , the left side shows the second green light emitting device 4022, and the right side shows two first green light emitting devices 4021. It should be noted that, Figure 5 Only the cross-sectional structure of the green pixel unit 402 is shown, and the cross-sectional structures of the red pixel unit 401 and the blue pixel unit 403 are similar. Figure 5 The display backplane 510 and the touch function layer 520 are simplified, and only part of the film layers are shown.

[0048] Below Figure 5 The second green light emitting device 4022 shown represents a second light emitting device, Figure 5 The first green light emitting device 4021 shown represents the first light emitting device for illustration. Figure 5 As shown, the display backplane 510 is, for example, an OLED display backplane, including a substrate 511 and a spacing layer, a driving circuit layer, a light-emitting functional layer and a packaging layer sequentially stacked on the substrate 511 .

[0049] The spacer layer includes a barrier layer (Barrier) formed on the substrate 511 and a buffer layer (Buffer) formed on the barrier layer. For example, the substrate 511 can be a flexible substrate of materials such as polyimide (PI), polyethylene naphthalate (PEN), thermoplastic polyester (PET), etc., or a rigid substrate of materials such as glass and quartz. The barrier layer and the buffer layer can be formed on the entire surface of the substrate. For example, the barrier layer can be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride, and the buffer layer can also be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The barrier layer is beneficial to blocking water and oxygen from entering the OLED formed later from the bottom. The buffer layer is beneficial to the quality of subsequent material deposition.

[0050] The driving circuit layer may also be referred to as a thin film transistor (TFT) layer, including an active layer (Active) formed on the buffer layer by a patterning process, a gate insulating layer (GI) formed on the active layer by deposition or the like, a gate (Gate) of a thin film transistor formed on the gate insulating layer by a patterning process, a dielectric layer (ILD) formed on the gate by deposition or the like, a source-drain metal layer formed on the dielectric layer, and a flat layer (PLN) covering the source-drain metal layer and the exposed dielectric layer, wherein the source-drain metal layer forms the source (Source) and drain (Drain) of the thin film transistor, for example, the source is electrically connected to the active layer through a dielectric layer via. Among them, the active layer may be made of materials such as polysilicon and metal oxides, the gate insulating layer may be made of inorganic insulating materials such as silicon oxide, silicon nitride or silicon oxynitride, and the dielectric layer may be made of inorganic insulating materials such as silicon oxide, silicon nitride or silicon oxynitride. The gate material includes metals or alloy materials such as aluminum, titanium, and cobalt. The flat layer is, for example, an organic material.

[0051] The light-emitting functional layer includes a pixel definition layer (PDL) 512 formed on the flat layer and an anode (Anode) arranged in an array. The pixel definition layer 512 has an opening to expose the anode. The anode is, for example, a metal oxide such as ITO, IZO, or a metal such as Ag, Al, Mo, or an alloy material thereof. The anode is electrically connected to the second source and drain metal layer through a via hole in the flat layer, thereby being electrically connected to the drain of the thin film transistor. The pixel definition layer can be formed using a composition process and surrounds the anode. Exemplarily, the material of the pixel definition layer can include organic insulating materials such as negative photoresist, polyimide, and epoxy resin.

[0052] The light-emitting functional layer also includes a light-emitting layer (EL) covering the anode and a cathode (Cathode) 514 covering the light-emitting layer and the exposed pixel definition layer 512. The cathode 514 is formed on the entire surface, for example. The material of the cathode 514 may include metals such as Mg, Ca, Li or Al or their alloys, or metal oxides such as IZO and ZTO, or organic materials with conductive properties such as PEDOT / PSS (poly 3,4-ethylenedioxythiophene / polystyrene sulfonate).

[0053] The light-emitting layer includes a first light-emitting layer 5131 and a second light-emitting layer 5132. The first light-emitting layer 5131 represents a first light-emitting device (for example, a first green light-emitting device 4021) in a first pixel unit serving as an anti-peeping pixel unit, and the second light-emitting layer 5132 represents a second light-emitting device (for example, a second green light-emitting device 4022) in a second pixel unit serving as a shared pixel unit.

[0054] The encapsulation layer includes a first inorganic encapsulation layer (not shown in the figure) covering the cathode, an organic encapsulation layer 515 and a second inorganic encapsulation layer 516. For example, the first inorganic encapsulation layer and the second inorganic encapsulation layer 516 are formed by deposition or the like. The organic encapsulation layer 515 is formed by inkjet printing. For example, the first inorganic encapsulation layer and the second inorganic encapsulation layer 516 can be formed by inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride, and the organic encapsulation layer 515 can be formed by organic materials such as polyimide (PI) and epoxy resin. Thus, the first inorganic encapsulation layer, the organic encapsulation layer 515 and the second inorganic encapsulation layer 516 are formed into a composite encapsulation layer, which can form multiple protections for the functional structures in the display backplane 510 and has a better encapsulation effect.

[0055] The touch function layer 520 includes a touch buffer layer 521, a touch metal layer and a touch protection layer (TOC) 523 which are sequentially stacked on the packaging layer, wherein the touch metal layer includes a first touch metal layer (Touch Metal A, TMA), a second touch metal layer (Touch Metal B, TMB) 522 and a touch insulating layer (Touch Insulator, TLD) located between the first touch metal layer and the second touch metal layer 522.

[0056] The light adjustment layer 530 includes a black matrix layer 531, a first flat layer 532 covering the black matrix layer 531, a first lens layer located on the first flat layer 532, a second flat layer 534 covering the first lens layer, and a second lens layer located on the second flat layer 534. The first lens layer includes a plurality of first lens groups, the first lens group includes a plurality of first lenses 533, the second lens layer includes a plurality of second lenses 535, and the orthographic projection of a second lens 535 on the substrate 511 covers a first lens group ( Figure 5The cross section shown includes two orthographic projections of first lenses 533) on substrate 511, an orthographic projection of a first lens group on substrate 511 covers an orthographic projection of a first light-emitting device (first light-emitting layer 5131) on substrate 511, and the black matrix layer 531 has a first opening corresponding to the first light-emitting device (first light-emitting layer 5131) and a second opening corresponding to the second light-emitting device (second light-emitting layer 5132), as shown in FIG. Figure 5 As shown, the orthographic projection of the first opening on the substrate 511 covers the orthographic projection of the first light-emitting device (first light-emitting layer 5131) on the substrate 511, and the orthographic projection of the second opening on the substrate 511 covers the orthographic projection of the second light-emitting device (second light-emitting layer 5132) on the substrate 511. In addition, another black matrix layer may be provided between the second inorganic encapsulation layer 516 and the touch buffer layer 521, and the orthographic projection of the opening of the other black matrix layer on the substrate 511 is covered by the orthographic projection of the opening of the black matrix layer 531 on the substrate 511.

[0057] For example Figure 5 As shown, the second lens layer in the light adjustment layer 530 further includes a fourth lens 537 corresponding to the second light-emitting device (the second light-emitting layer 5132), and the orthographic projection of the fourth lens 537 on the substrate 511 covers the orthographic projection of the second light-emitting device (the second light-emitting layer 5132) on the substrate 511. For example, the height (or thickness, i.e. Figure 5 The length in the vertical direction) is the same as the height of the second lens 535.

[0058] Based on the design that the area of ​​the first light-emitting device (first light-emitting layer 5131) is smaller than the area of ​​the second light-emitting device (second light-emitting layer 5132), or in other words, based on the design that the opening area of ​​the pixel defining layer 512 exposing the first light-emitting device (first light-emitting layer 5131) is smaller than the opening area including the second light-emitting device (second light-emitting layer 5132), combined with the design of the first opening and the second opening of the black matrix layer 531, and the design of the second lens 535 and the fourth lens 537, it is achieved that the display light viewing angle of the second pixel unit as a shared pixel unit is greater than that of the first pixel unit as an anti-peep pixel unit, and the red pixel unit 101, the green pixel unit 102 and the blue pixel unit 103 are all designed for this purpose.

[0059] Furthermore, by setting a first lens group corresponding to each first light-emitting device (first light-emitting layer 5131), and setting the first lens group to include multiple first lenses 533, the display light beam emitted by the first light-emitting device (first light-emitting layer 5131) can be divided into multiple sub-beams, which are then uniformly lighted by the second lens 535 to form a non-rotationally symmetric light spot on the surface of the display screen, thereby effectively improving the phenomenon of dark corners of the anti-peeping display screen in the anti-peeping display mode in which only the first pixel unit serving as the anti-peeping pixel unit emits light, improving the brightness uniformity of the anti-peeping display screen in the anti-peeping display mode, and optimizing the display effect.

[0060] The cover plate 540 is, for example, a glass cover plate (CG).

[0061] In a possible implementation manner, the first lens group includes four first lenses.

[0062] Continuing with the previous example, Figure 5 and Figure 6 As shown, the first lens group includes four first lenses 533, so that the splitting effect of the display light beam emitted by the first light-emitting device (first light-emitting layer 5131) can be ensured, and the process difficulty of lens preparation can also be controlled.

[0063] Figure 6 The figure shows a three-dimensional structure in which the first lens group corresponding to the orthographic projection of the first light-emitting device (the first light-emitting layer 5131) includes four first lenses 533. Figure 6 The three-dimensional structure shows the positional relationship between the circular cross-section of the first light-emitting layer 5131 parallel to the substrate 511, or the circular cross-section of the opening of the pixel defining layer 512 parallel to the substrate 511 that exposes the first light-emitting device (first light-emitting layer 5131), and the first lens 533.

[0064] In a possible implementation manner, in the first lens group, adjacent first lenses are in contact with each other.

[0065] Continuing with the previous example, Figure 5 and Figure 6 As shown, among the four first lenses 533 in the first lens group, adjacent first lenses 533 are in contact with each other. Figure 5 and Figure 6 As shown, the center of the orthographic projection of the first lens group on the substrate 511 coincides with the center of the orthographic projection of the first light emitting device (first light emitting layer 5131) on the substrate 511. The above design is more conducive to ensuring the uniformity of the display light. In addition, as Figure 5 and Figure 6As shown, the four first lenses 533 in a first lens group have the same size, and the orthographic projection of the center of the first lens group formed by the four abutting first lenses 533 on the substrate 511 coincides with the orthographic projection of the center of the first light-emitting device (first light-emitting layer 5131) on the substrate 511.

[0066] In a possible implementation manner, a height-to-width ratio of the first lens is greater than 1.

[0067] Continuing with the previous example, Figure 5 and Figure 6 As shown, the aspect ratio of the first lens 533 is the ratio of its height to its width. The height of the first lens 533 is Figure 5 The length of the first lens 533 in the vertical direction, and the width of the first lens 533 is the maximum side length of its rectangular bottom surface. In this way, it is more conducive to improving the splitting effect of the first lens layer on the display light beam emitted by the first light-emitting device (first light-emitting layer 5131).

[0068] In a possible implementation, the display substrate further includes a third lens layer located between the first lens layer and the second lens layer, the third lens layer includes a plurality of third lens groups, the third lens group includes a plurality of third lenses, and the orthographic projection of one of the third lenses on the substrate coincides with the orthographic projection of one of the first lenses on the substrate. In this way, the third lens layer can further filter the plurality of sub-beams formed by the first lens layer splitting the display light beam emitted by the first light-emitting device, eliminate the stray light therein, and thus form a more uniform non-rotationally symmetrical light spot on the display screen surface after being homogenized by the second lens.

[0069] Continuing with the previous example, Figure 5 As shown in the display substrate, Figure 7 As shown, the display substrate may further include a third lens layer located between the first lens layer and the second lens layer, the third lens layer includes a plurality of third lens groups, the third lens group includes a plurality of third lenses 538, and the orthographic projection of a third lens 538 on the substrate 511 coincides with the orthographic projection of a first lens 533 on the substrate 511, that is, the distribution of the third lenses 538 in the third lens layer is the same as the distribution of the first lenses 533 in the first lens layer. The third lens layer can further filter the plurality of sub-beams, for example, having a roughly rectangular distribution, formed by the first lens layer splitting the display light beam emitted by the first light-emitting device (first light-emitting layer 5131), eliminate the stray light therein, so as to form a more uniform roughly rectangular light spot on the display screen surface after being homogenized by the second lens, which is more conducive to improving the phenomenon that the four corners of the co-pilot display screen are dark in the anti-peeping display mode in which only the first pixel unit emits light.

[0070] Figure 7In the display substrate shown in FIG. 1 , the light path of the first light emitting device (first light emitting layer 5131) emitting display light is as follows: Figure 8 As shown, when the display light beam emitted by the first light-emitting device (first light-emitting layer 5131) is incident on the first lens group including multiple first lenses 533, the first lens group divides the display light beam into multiple sub-beams, and then reaches the MN area on the surface of the display screen after filtering by the second lens group and homogenizing by the second lens 535. Because each sub-beam can irradiate the target MN area, the energy distribution in this area is the result of the superposition of multiple sub-beams in this area. Since each sub-beam is a part of the original display light beam, the uniformity of the light intensity distribution is much better than that of the original display light beam. The light intensity of the sub-beams is uneven, and it will become uniform after superposition in the MN area. Based on the display substrate provided in this embodiment, the brightness attenuation of the four corners of the co-pilot display screen is small when it is in the anti-peeping display mode, thereby improving the phenomenon of dark corners.

[0071] In a possible implementation manner, the first lens and the third lens have the same size.

[0072] Continuing with the previous example, Figure 7 and Figure 8 As shown, the first lens 533 and the third lens 538 are of the same size, so that the third lens layer has the same morphology as the first lens layer, which is more conducive to ensuring the uniformity of the display light.

[0073] In a possible implementation manner, the first lens and the third lens are convex lenses respectively.

[0074] In a possible implementation manner, the second lens is a convex lens, for example, an integrating lens for achieving light beam homogenization.

[0075] For example Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the first lens 533, the second lens 535, the third lens 538 and the fourth lens 537 are convex lenses respectively.

[0076] Continuing with the previous example, Figure 7 The method for preparing the display substrate shown is, for example:

[0077] First, a display back panel 510 is prepared;

[0078] Then, a touch function layer 520 is prepared on the display backplane 510;

[0079] Then, a black matrix layer 531 with openings is prepared by a patterning process;

[0080] Then, a first planarization layer 532 of, for example, an organic material covering the black matrix layer 531 is formed;

[0081] Then, a first lens layer including first lenses 533 is formed on the first flat layer 532;

[0082] Then, a second flat layer 534 of, for example, an organic material covering the first lens layer is formed;

[0083] Then, a third lens layer including a third lens 538 is formed on the second flat layer 534;

[0084] Then, a third flat layer 539 of, for example, an organic material covering the third lens layer is formed;

[0085] Then, a second lens layer including a second lens 535 and a fourth lens 537 is formed on the third flat layer 539;

[0086] Then, a fourth flat layer 536 of, for example, an organic material covering the second lens layer is formed. For example, the materials of the second flat layer 534 , the third flat layer 539 , and the fourth flat layer 536 are the same as the material of the first flat layer 532 .

[0087] Finally, the cover plate 540 is formed.

[0088] Another embodiment of the present disclosure provides a display device, including the above-mentioned display substrate, wherein the display device can be a display device that meets the anti-peeping display requirements in various scenarios, such as a passenger display screen, a mobile phone, a tablet computer, a monitor, a laptop computer, a digital photo frame, etc.

[0089] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not limitations on the implementation methods of the present disclosure. For ordinary technicians in this field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present disclosure are still within the protection scope of the present disclosure.

Claims

1. A display substrate, characterized in that: include: substrate; A plurality of pixel units are arranged on the substrate, each of the pixel units comprising a first pixel unit and a second pixel unit; The first pixel unit includes at least one first light emitting device, the second pixel unit includes a second light emitting device, and an area of ​​an orthographic projection of the second light emitting device on the substrate is larger than an area of ​​an orthographic projection of the first light emitting device on the substrate; A first lens layer located at a side of the pixel unit away from the substrate and a second lens layer located at a side of the first lens layer away from the substrate, wherein the first lens layer includes a plurality of first lens groups, the first lens group includes a plurality of first lenses, the second lens layer includes a plurality of second lenses, an orthographic projection of the second lens on the substrate covers an orthographic projection of the first lens group on the substrate, and an orthographic projection of the first lens group on the substrate covers an orthographic projection of the first light-emitting device on the substrate.

2. The display substrate according to claim 1, characterized in that: In the first lens group, adjacent first lenses are in contact with each other.

3. The display substrate according to claim 1, characterized in that: The first lens group includes four first lenses.

4. The display substrate according to claim 1, characterized in that: The aspect ratio of the first lens is greater than 1.

5. The display substrate according to any one of claims 1 to 4, characterized in that: The display substrate further includes a third lens layer located between the first lens layer and the second lens layer, the third lens layer includes a plurality of third lens groups, the third lens group includes a plurality of third lenses, and an orthographic projection of one of the third lenses on the substrate coincides with an orthographic projection of one of the first lenses on the substrate.

6. The display substrate according to claim 5, characterized in that: The first lens and the third lens have the same size.

7. The display substrate according to claim 5, characterized in that: The first lens and the third lens are convex lenses respectively.

8. The display substrate according to claim 1, characterized in that: The second lens is a convex lens.

9. A display device, characterized in that: The display substrate comprises the display substrate as claimed in any one of claims 1 to 8.

10. The display device according to claim 9, characterized in that: The display device includes a co-pilot display screen.

Images