Display substrate and display device

Abstract

The display substrate and the display device are disclosed. In a specific embodiment, the display substrate comprises a substrate; a plurality of pixel units arranged on the substrate, each pixel unit comprising a first pixel unit and a second pixel unit; the first pixel unit comprising at least one first light emitting device, the second pixel unit comprising a second light emitting device, an area of a projection of the second light emitting device on the substrate being greater than an area of a projection of the first light emitting device on the substrate; a first lens layer located on a side of the pixel unit away from the substrate and a second lens layer located on a side of the first lens layer away from the substrate, the first lens layer comprising a plurality of first lens groups, each first lens group comprising a plurality of first lenses, the second lens layer comprising a plurality of second lenses, a projection of one second lens on the substrate covering a projection of one first lens group on the substrate, a projection of one first lens group on the substrate covering a projection of one first light emitting device on the substrate.

Description

Technical Field

[0001] This disclosure relates to the field of display technology. More specifically, it relates to a display substrate and a display device. Background Technology

[0002] Currently, there is a need in some scenarios for privacy displays that can be switched to a privacy mode. For example... Figure 1 As shown, many vehicles currently have multiple touchscreen displays, including an instrument cluster display (IDU) 101, a center console display (CID) 102, and a passenger-side display (CDD) 103. For driving safety, the passenger-side display 103 needs to be switched to a narrow-viewing-angle privacy mode while driving to prevent the driver from being distracted by the content displayed on the passenger-side display 103, thus allowing the driver to concentrate on driving. The inventors have discovered that privacy displays often exhibit darkened corners in privacy mode. For example, the roughly rectangular passenger-side display 103 often shows darkened corners in privacy mode, affecting the display quality. Summary of the Invention

[0003] The purpose of this 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] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0005] The first aspect of this disclosure provides a display substrate, comprising:

[0006] Substrate;

[0007] Multiple pixel units are disposed on the substrate, each pixel unit including 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 the area of ​​the orthogonal projection of the second light-emitting device on the substrate is larger than the area of ​​the orthogonal projection of the first light-emitting device on the substrate;

[0008] A first lens layer located on the side of the pixel unit away from the substrate and a second lens layer located on the side of the first lens layer away from the substrate, the first lens layer including a plurality of first lens groups, the first lens group including a plurality of first lenses, the second lens layer including a plurality of second lenses, the orthogonal projection of a second lens on the substrate covering the orthogonal projection of a first lens group on the substrate, and the orthogonal projection of a first lens group on the substrate covering the orthogonal projection of a first light-emitting device on the substrate.

[0009] Optionally, in the first lens group, adjacent first lenses abut against 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, and the third lens groups include a plurality of third lenses. 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.

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

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

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

[0016] A second aspect of this disclosure provides a display device, including the display substrate provided in the first aspect of this disclosure.

[0017] Optionally, the display device includes a passenger-side display screen.

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

[0019] The technical solution described in this disclosure, 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 divide the display beam emitted by the first light-emitting device into multiple sub-beams, and then after being uniformly illuminated by the second lens, form a non-rotationally symmetrical light spot on the display screen surface. This effectively improves the phenomenon of dark corners in the privacy display screen in the privacy display mode where only the first pixel unit emits light, improves the brightness uniformity of the privacy display screen in the privacy display mode, and optimizes the display effect. Attached Figure Description

[0020] The specific embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0021] Figure 1 A schematic diagram showing the distribution of in-vehicle displays is provided.

[0022] Figure 2 In the diagram, 2(a) shows a schematic diagram of the passenger-side display screen in shared display mode from the passenger-side view, and 2(b) shows a schematic diagram of the passenger-side display screen in privacy display mode from the passenger-side view.

[0023] Figure 3 This diagram illustrates the display effect of the passenger-side display screen in privacy mode from the passenger's perspective.

[0024] Figure 4 This diagram illustrates the pixel arrangement of a display substrate provided in an embodiment of the present disclosure.

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

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

[0027] Figure 7 This diagram shows another cross-sectional view of a display substrate provided in an embodiment of the present disclosure.

[0028] Figure 8 Show Figure 7 The diagram shows the optical path of the first light-emitting device in the display substrate emitting display light. Detailed Implementation

[0029] The terms “on”, “formed on”, and “set on” used in this disclosure can indicate that one layer is directly formed or set on another layer, or that one layer is indirectly formed or set on another layer, meaning that 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 components, members, elements, regions, layers, and / or parts, these components, members, elements, regions, layers, and / or parts should not be limited by these terms. Rather, these terms are used to distinguish one component, member, element, region, layer, and / or part from another. Thus, for example, the first component, first member, first element, first region, first layer, and / or first part discussed below may be referred to as a second component, second member, second element, second region, second layer, and / or second part without departing from the teachings of this disclosure.

[0031] In this disclosure, unless otherwise stated, the term "co-layer arrangement" means that two layers, components, members, elements, or portions can be formed by the same fabrication process (e.g., patterning process), and that the two layers, components, members, elements, or portions are generally formed of the same material. For example, co-layer arrangement of two or more functional layers means that these co-layer functional layers can be formed using the same material layers and the same fabrication process, thereby simplifying the fabrication process of the display substrate.

[0032] In this disclosure, unless otherwise stated, the term "patterning process" generally includes steps such as photoresist coating, exposure, development, etching, and photoresist stripping. The term "one-step patterning process" refers to a process that uses a photomask to form patterned layers, components, or parts.

[0033] Currently, there is a need for privacy displays that can switch to a privacy mode in some scenarios. For example, for driving safety, privacy displays may be required while driving. Figure 1 The passenger-side display 103 shown needs to be switched to a narrow-viewing-angle privacy screen mode to prevent driver distraction. The inventors discovered that privacy screens often exhibit darkened corners in privacy screen mode. For example, the roughly rectangular passenger-side display 103 often shows darkened corners in privacy screen mode, affecting the display effect.

[0034] The invention further investigated the cause, taking the roughly rectangular passenger-side display screen 103 as an example, which includes multiple pixel units, such as red pixel units, green pixel units and blue pixel units. The red pixel units include red privacy pixel units and red shared pixel units, the green pixel units include green privacy pixel units and green shared pixel units, and the blue pixel units include blue privacy pixel units and blue shared pixel units. The red shared pixel unit has a wider viewing angle than the red privacy pixel unit, the green shared pixel unit has a wider viewing angle than the green privacy pixel unit, and the blue shared pixel unit has a wider viewing angle than the blue privacy pixel unit. When switching to the shared display mode, the red, green, and blue shared pixel units emit display light to display content, or the red, red, green, green, green, blue, and blue shared pixel units emit display light to display content. Both the passenger seat and the driver seat can see the content displayed on the passenger display screen 103. However, when switching to the privacy display mode, the red, green, and blue privacy pixel units emit display light to display content, and only the passenger seat can see the content displayed on the passenger display screen 103.

[0035] The inventors discovered, for example, including 2(a) and 2(b) Figure 2 and Figure 3 As shown, from the passenger's perspective, the roughly rectangular passenger display screen 103 often exhibits a darkening of the four corners in privacy mode. Based on the above structural analysis of the passenger display screen, the inventors believe that this is because the attenuation curve of the display light emitted from the privacy pixel unit in each direction with the change of viewing angle is rotationally symmetrical about the center of the privacy pixel unit. The attenuation curve of the display light of the passenger display screen 103 in privacy mode is symmetrical in all directions. When the passenger display screen 103 is in privacy mode, the brightness attenuation of the four corners is greater, thus causing the phenomenon of darkening of the four corners.

[0036] In view of this, embodiments of the present disclosure provide a display substrate, including...

[0037] Substrate;

[0038] Multiple pixel units are disposed on the substrate, each pixel unit including 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 the area of ​​the orthogonal projection of the second light-emitting device on the substrate is larger than the area of ​​the orthogonal projection of the first light-emitting device on the substrate;

[0039] A first lens layer located on the side of the pixel unit away from the substrate and a second lens layer located on the side of the first lens layer away from the substrate, the first lens layer including a plurality of first lens groups, the first lens group including a plurality of first lenses, the second lens layer including a plurality of second lenses, the orthogonal projection of a second lens on the substrate covering the orthogonal projection of a first lens group on the substrate, and the orthogonal projection of a first lens group on the substrate covering the orthogonal projection of a first light-emitting device on the substrate.

[0040] The display substrate provided in this embodiment, 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 divide the display beam emitted by the first light-emitting device into multiple sub-beams, and then after being homogenized by a second lens, form a non-rotationally symmetrical light spot, such as a rectangular light spot, on the surface of the display screen. This effectively improves the phenomenon of dark corners in the privacy display screen in the privacy display mode where only the first pixel unit, which serves as the privacy pixel unit, emits light, improves the brightness uniformity of the privacy display screen in the privacy display mode, and optimizes the display effect.

[0041] In a specific example, a privacy screen is roughly rectangular, for example... Figure 1 Taking the passenger-side display screen 103 shown as an example,

[0042] Figure 4 This embodiment shows the pixel arrangement of the display substrate. Figure 5 for Figure 4 BB cross-sectional view, 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 disposed on the substrate 511. 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 privacy 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 privacy pixels, and the second red pixel unit includes a second red light-emitting device 4012 corresponding to a red shared pixel.

[0044] Green pixel unit 402 includes a first green pixel unit as a green privacy 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 privacy pixels, and the second green pixel unit includes a second green light-emitting device 4022 corresponding to a green shared pixel.

[0045] Blue pixel unit 403 includes a first blue pixel unit as a blue privacy 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 privacy 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 this embodiment does not specifically limit the pixel arrangement position.

[0047] For example Figure 5 As shown, the display substrate provided in this example includes a display backplate 510 comprising a substrate 511, a touch function layer 520, a light adjustment layer 530, and a cover plate 540. As... 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; the cross-sectional structures of the red pixel unit 401 and the blue pixel unit 403 are similar. It should be noted that... Figure 5 The display back panel 510 and the touch function layer 520 have been simplified, with only a portion of the film layers shown.

[0048] The following is based on 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 is described in the illustration to represent the first light-emitting device, as follows: Figure 5 As shown, the display backplane 510 is, for example, an OLED display backplane, including a substrate 511 and a spacer layer, a driving circuit layer, a light-emitting functional layer and an encapsulation layer sequentially stacked on the substrate 511.

[0049] The spacer layer includes a barrier layer formed on the substrate 511 and a buffer layer formed on the barrier layer. For example, the substrate 511 can be a flexible substrate made of materials such as polyimide (PI), polyethylene naphthalate (PEN), or thermoplastic polyester (PET), or a rigid substrate made of materials such as glass or quartz. The barrier layer and 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 helps to prevent water and oxygen from entering the OLED from the bottom. The buffer layer improves the quality of subsequent material deposition.

[0050] The driving circuit layer, also known as the thin-film transistor (TFT) layer, includes an active layer formed on a buffer layer using a patterning process; a gate insulating layer (GI) formed on the active layer by deposition or other methods; the gate of the TFT formed on the gate insulating layer using a patterning process; a dielectric layer (ILD) formed on the gate by deposition or other methods; a source / drain metal layer formed on the dielectric layer; and a planarization layer (PLN) covering the source / drain metal layer and the exposed dielectric layer. The source / drain metal layer forms the source and drain of the TFT. For example, the source is electrically connected to the active layer through a via in the dielectric layer. The active layer can be made of materials such as polysilicon and metal oxides. The gate insulating layer can be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The dielectric layer can also be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The gate material includes metals or alloys such as aluminum, titanium, and cobalt. The planarization layer is, for example, an organic material.

[0051] The light-emitting functional layer includes a pixel defining layer (PDL) 512 formed on a planarization layer and an array of anodes. The pixel defining layer 512 has an opening that exposes the anodes. The anodes are, for example, metal oxides such as ITO and IZO, or metals such as Ag, Al, and Mo, or their alloys. The anodes are electrically connected to a second source / drain metal layer, for example, through a via in the planarization layer, thereby being electrically connected to the drain of a thin-film transistor. The pixel defining layer can be formed using a patterning process and surrounds the anodes. For example, the material of the pixel defining layer may include negative photoresist, polyimide, epoxy resin, or other organic insulating materials.

[0052] The light-emitting functional layer also includes a light-emitting layer (EL) covering the anode and a cathode 514 covering the light-emitting layer and the exposed pixel defining layer 512. The cathode 514 may be formed over an 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 or ZTO, or conductive organic materials 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 (e.g., a first green light-emitting device 4021) in a first pixel unit that serves as a privacy pixel unit, and the second light-emitting layer 5132 represents a second light-emitting device (e.g., a second green light-emitting device 4022) in a second pixel unit that serves 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 other methods. 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 using inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride, while the organic encapsulation layer 515 can be formed using 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 form a composite encapsulation layer. This composite encapsulation layer can provide multiple layers of protection for the functional structures in the display backplane 510, resulting in better encapsulation performance.

[0055] The touch function layer 520 includes a touch buffer layer 521, a touch metal layer, and a touch protection layer (TOC) 523 stacked sequentially on the encapsulation layer. 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-adjusting layer 530 includes a black matrix layer 531, a first planarization layer 532 covering the black matrix layer 531, a first lens layer located on the first planarization layer 532, a second planarization layer 534 covering the first lens layer, and a second lens layer located on the second planarization layer 534. The first lens layer includes a plurality of first lens groups, and the first lens groups include a plurality of first lenses 533. The second lens layer includes a plurality of second lenses 535. The orthographic projection of a second lens 535 onto the substrate 511 covers a first lens group. Figure 5The cross-section shown includes the orthographic projections of two first lenses (533) onto the substrate 511. The orthographic projection of a first lens group onto the substrate 511 covers the orthographic projection of a first light-emitting device (first light-emitting layer 5131) onto the substrate 511. 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. 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. Furthermore, another black matrix layer may also be disposed between the second inorganic encapsulation layer 516 and the touch buffer layer 521, and the orthographic projection of the opening of this 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 also includes a fourth lens 537 corresponding to the second light-emitting device (second light-emitting layer 5132). The orthogonal projection of the fourth lens 537 onto the substrate 511 covers the orthogonal projection of the second light-emitting device (second light-emitting layer 5132) onto the substrate 511. For example, the height (or thickness) of the fourth lens 537... Figure 5 The vertical length 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 and second openings of the black matrix layer 531, and the design of the second lens 535 and the fourth lens 537, the display light viewing angle of the second pixel unit, which is a shared pixel unit, is greater than that of the first pixel unit, which is a privacy pixel unit. 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 beam emitted by the first light-emitting device (first light-emitting layer 5131) can be divided into multiple sub-beams, which are then uniformly distributed by the second lens 535 to form a non-rotationally symmetrical light spot on the display screen surface. This effectively improves the phenomenon of dark corners in the privacy display screen in the privacy display mode where only the first pixel unit, which is the privacy pixel unit, emits light, improves the brightness uniformity of the privacy display screen in the privacy display mode, and optimizes the display effect.

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

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

[0062] Continuing with the previous example, such as Figure 5 and Figure 6 As shown, the first lens group includes four first lenses 533, which can ensure the segmentation effect of the display beam emitted from the first light-emitting device (first light-emitting layer 5131) and also control the difficulty of lens manufacturing process.

[0063] Figure 6 The diagram shows the three-dimensional structure of the first lens group, which includes four first lenses 533, corresponding to the orthographic projection of the first light-emitting device (first light-emitting layer 5131). Figure 6 The diagram 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 pixel defining layer 512 exposing the opening of the first light-emitting device (first light-emitting layer 5131) parallel to the substrate 511, and the first lens 533.

[0064] In one possible implementation, adjacent first lenses in the first lens group abut against each other.

[0065] Continuing with the previous example, such as Figure 5 and Figure 6 As shown, in the first lens group, among the four first lenses 533, adjacent first lenses 533 abut against each other. Additionally, as... Figure 5 and Figure 6 As shown, the center of the first lens group's orthogonal projection onto the substrate 511 coincides with the center of the first light-emitting device (first light-emitting layer 5131)'s orthogonal projection onto the substrate 511. This design is more conducive to ensuring the uniformity of the displayed light. Furthermore, as... Figure 5 and Figure 6As shown, the four first lenses 533 in a first lens group are of 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 one possible implementation, the aspect ratio of the first lens is greater than 1.

[0067] Continuing with the previous example, such as Figure 5 and Figure 6 As shown, the aspect ratio of the first lens 533 is the ratio of its height to its width, and 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 are the maximum side lengths of its rectangular base. This is more conducive to improving the segmentation effect of the first lens layer on the display beam emitted from the first light-emitting device (first light-emitting layer 5131).

[0068] In one 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 multiple third lens groups, each containing multiple third lenses. The orthographic projection of one of the third lenses onto the substrate coincides with the orthographic projection of one of the first lenses onto the substrate. In this way, the third lens layer can further filter the multiple sub-beams formed by the first lens layer splitting the display beam emitted from the first light-emitting device, eliminating stray light and thus forming a more uniform, non-rotationally symmetric light spot on the display screen surface after being homogenized by the second lens.

[0069] Continuing with the previous example, in Figure 5 Based on the display substrate shown, such as 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 multiple third lens groups, each containing multiple third lenses 538. The orthographic projection of a third lens 538 onto the substrate 511 coincides with the orthographic projection of a first lens 533 onto 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 multiple sub-beams, for example, those with a roughly rectangular distribution, formed by the first lens layer splitting the display beam emitted from the first light-emitting device (first light-emitting layer 5131), eliminating stray light. This results in 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 of dark corners on the passenger-side display screen in the privacy display mode where only the first pixel unit emits light.

[0070] Figure 7In the display substrate shown, 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 beam emitted from 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 beam into multiple sub-beams. After being filtered by the second lens group and homogenized by the second lens 535, the beam reaches the MN region on the display screen surface. Because each sub-beam can illuminate the target MN region, the energy distribution in this region is the result of the superposition of multiple sub-beams in this region. Since each sub-beam is part of the original display beam, the uniformity of light intensity distribution is much better than that of the original display beam. The uneven light intensity of the sub-beams becomes uniform after superposition in the MN region. Based on the display substrate provided in this embodiment, the brightness attenuation of the four corners of the passenger-side display screen is small when it is in privacy display mode, thereby improving the phenomenon of dark corners.

[0071] In one possible implementation, the first lens and the third lens are the same size.

[0072] Continuing with the previous example, for example Figure 7 and Figure 8 As shown, the first lens 533 and the third lens 538 have the same size. In this way, the third lens layer has the same shape as the first lens layer, which is more conducive to ensuring the uniformity of the displayed light.

[0073] In one possible implementation, the first lens and the third lens are both convex lenses.

[0074] In one possible implementation, the second lens is a convex lens, such as an integrating lens for achieving 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 all convex lenses.

[0076] Continuing with the previous example, Figure 7 The fabrication method of the display substrate shown is as follows:

[0077] First, the display backplate 510 is prepared;

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

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

[0080] Then, a first planar layer 532, such as an organic material, is formed covering the black matrix layer 531;

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

[0082] Then, a second planar layer 534, such as an organic material, is formed to cover the first lens layer;

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

[0084] Then, a third planar layer 539, such as an organic material, is formed to cover the third lens layer;

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

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

[0087] Finally, cover plate 540 is formed.

[0088] Another embodiment of this disclosure provides a display device including the aforementioned display substrate. The display device can be used in various scenarios to meet privacy protection display requirements, such as a passenger-side display, mobile phone, tablet computer, monitor, laptop computer, digital photo frame, etc.

[0089] Obviously, the above embodiments of this disclosure are merely examples for clearly illustrating this disclosure, and are not intended to limit the implementation of this disclosure. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all implementation methods here. Any obvious variations or modifications derived from the technical solutions of this disclosure are still within the protection scope of this disclosure.

Claims

1. A display substrate, characterized by, Comprising: a substrate; a plurality of pixel units disposed on the substrate, each of the pixel units comprising a first pixel unit and a second pixel unit; the first pixel unit comprising at least one first light emitting device, the second pixel unit comprising a second light emitting device, an area of a normal projection of the second light emitting device on the substrate being greater than an area of a normal projection of the first light emitting device on the substrate; a first lens layer located on a side of the pixel units away from the substrate and a second lens layer located on a side of the first lens layer away from the substrate, the first lens layer comprising a plurality of first lens groups, each of the first lens groups comprising a plurality of first lenses, each of the first lenses being a convex lens, the second lens layer comprising a plurality of second lenses, each of the second lenses being a convex lens, a normal projection of one of the second lenses on the substrate covering a normal projection of one of the first lens groups on the substrate, a normal projection of one of the first lens groups on the substrate covering a normal projection of one of the first light emitting devices on the substrate.

2. The display substrate of claim 1, wherein, In the first lens groups, adjacent first lenses abut against each other.

3. The display substrate of claim 1, wherein, The first lens groups comprise four first lenses.

4. The display substrate of claim 1, wherein, An aspect ratio of the first lenses is greater than 1.

5. The display substrate according to any one of claims 1-4, wherein, The display substrate further comprises a third lens layer located between the first lens layer and the second lens layer, the third lens layer comprising a plurality of third lens groups, each of the third lens groups comprising a plurality of third lenses, a normal projection of one of the third lenses on the substrate coinciding with a normal projection of one of the first lenses on the substrate. 6.The display substrate of claim 5, wherein, The first lenses and the third lenses are of the same size. 7.The display substrate of claim 5, wherein, The third lenses are convex lenses.

8. A display device, characterized by comprising: The display device comprises a display screen.

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