Display screen, preparation method thereof and head-mounted display equipment

Abstract

The invention discloses a display screen and a preparation method thereof, and a head-mounted display device, the display screen comprises a screen body and a light control layer, the screen body is provided with a light-emitting unit, the light control layer is arranged on the light-emitting side of the screen body, and the light control layer is provided with a light-emitting port corresponding to the light-emitting unit, so that light emitted by the light-emitting unit is emitted through the light-emitting port. At least part of light emitted by the light-emitting unit is reflected by the section of the light outlet, so that large-angle light rays in the light emitted by the light-emitting unit can enter the section of the light outlet and are emitted after being reflected by the section, the emitting direction of the large-angle light rays can be controlled through the section, and therefore the light-emitting angle of the display screen can be controlled through the light control layer. The light emitting angle of the display screen can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a display screen and a preparation method thereof. The present invention also relates to a head-mounted display device. Background Art

[0002] Light Emitting Diode (LED) display technology has been widely applied in fields such as Virtual Reality (VR) and Augmented Reality (AR) due to its advantages of self-luminescence, wide color gamut, high stability, and the ability to achieve high brightness and high image resolution (the image resolution can be characterized by the number of pixels per inch of the image).

[0003] In the field of micro-displays, for a screen body using light-emitting diodes, an optical lens group is required to parallelize the outgoing light of the screen body and then enter the optical waveguide. Since the light-emitting diode is a Lambert source, the outgoing light angle of the screen body is > 60°, but only small-angle light can enter the optical lens group, such as light with an angle ≤ 30°. Therefore, the light utilization rate of the screen body is low, even lower than 20%, and it cannot meet the application requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a display screen and a preparation method thereof, which can reduce the outgoing light angle of the display screen. The present invention also provides a head-mounted display device.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A display screen, comprising:

[0007] A screen body provided with light-emitting units;

[0008] A light control layer disposed on the light-emitting side of the screen body, which is provided with light-emitting ports corresponding to the light-emitting units, so that the light emitted by the light-emitting units exits through the light-emitting ports, and at least part of the light emitted by the light-emitting units is reflected by the cross-section of the light-emitting ports.

[0009] Optionally, the caliber of the light-emitting ports gradually decreases along the direction away from the screen body.

[0010] Optionally, the light-emitting ports expose the light-emitting units corresponding to the light-emitting ports.

[0011] Optionally, it further comprises:

[0012] A light medium layer filled in the light-emitting ports, and the light medium layer is used to reduce the refractive index difference between the light-emitting units and the outside air.

[0013] Optionally, the surface of the optical medium layer away from the screen body is a smooth surface.

[0014] Optionally, the optical medium layer includes at least two sub-optical medium layers stacked in sequence, and the refractive indices of the at least two sub-optical medium layers increase or decrease in sequence.

[0015] Optionally, the light control layer includes a metal layer, so that the cross-section of the light exit can reflect light.

[0016] A method for manufacturing a display screen includes:

[0017] Forming a sacrificial layer on the light-emitting side of the screen body, and etching the sacrificial layer so that the sacrificial layer forms a barrier corresponding to the light-emitting unit, and the screen body is provided with the light-emitting unit;

[0018] Forming a light control layer on the side of the screen body where the barrier is formed, removing the light control layer formed on the barrier and removing the barrier, so that a light exit corresponding to the light-emitting unit is formed on the light control layer, and the light emitted by the light-emitting unit passes through the light exit, and at least part of the light emitted by the light-emitting unit is reflected by the cross-section of the light exit.

[0019] Optionally, the etching of the sacrificial layer so that the sacrificial layer forms a barrier corresponding to the light-emitting unit includes:

[0020] Etching the sacrificial layer using a wet etching method, retaining the sacrificial layer in the area corresponding to the light-emitting unit, and removing the sacrificial layer in other areas;

[0021] Etching the sacrificial layer in the area corresponding to the light-emitting unit using a photolithography method to form the barrier corresponding to the light-emitting unit.

[0022] Optionally, it further includes:

[0023] Forming an optical medium layer in the light exit, and the optical medium layer is used to reduce the refractive index difference between the light-emitting unit and the outside air.

[0024] Optionally, the optical medium layer includes at least two sub-optical medium layers stacked in sequence, and the refractive indices of the at least two sub-optical medium layers are different;

[0025] The forming of the optical medium layer in the light exit includes:

[0026] Forming each of the at least two sub-optical medium layers of the sub-optical medium layers in sequence on the side of the screen body where the light control layer is formed.

[0027] A head-mounted display device includes an optical element and the display screen described in any one of the above, wherein the optical element is disposed on the light-emitting path of the display screen.

[0028] As can be seen from the above technical solutions, for a display screen and a preparation method thereof provided by the present invention, the display screen includes a screen body and a light control layer. The screen body is provided with light-emitting units, and the light control layer is disposed on the light-emitting side of the screen body and is provided with light-emitting ports corresponding to the light-emitting units, so that the light emitted by the light-emitting units exits through the light-emitting ports. At least part of the light emitted by the light-emitting units is reflected by the cross-section of the light-emitting ports, enabling large-angle light rays emitted by the light-emitting units to be incident on the cross-section of the light-emitting ports and exit after being reflected by the cross-section. Therefore, the cross-section can control the emission direction of the large-angle light rays, so that the light-emitting angle of the display screen can be controlled through the light control layer, and the light-emitting angle of the display screen can be reduced.

[0029] A head-mounted display device provided by the present invention can achieve the above beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic diagram of the light path of the light emitted by the light-emitting units of a display screen provided by an embodiment of the present invention passing through the light control layer;

[0032] Figure 2 It is a schematic longitudinal sectional view of a display screen provided by Embodiment 1 of the present invention;

[0033] Figure 3 It is a schematic longitudinal sectional view of a display screen provided by Embodiment 2 of the present invention;

[0034] Figure 4 It is a schematic longitudinal sectional view of a display screen provided by Embodiment 3 of the present invention;

[0035] Figure 5 It is a flowchart of a method for preparing a display screen provided by an embodiment of the present invention;

[0036] Figure 6 It is a schematic diagram of forming a blocking body on one side of the screen body in a method for preparing a display screen provided by an embodiment of the present invention;

[0037] Figure 7 It is a schematic diagram of forming a light control layer on one side of the screen body in a method for preparing a display screen provided by an embodiment of the present invention;

[0038] Figure 8 Schematic diagram of removing a light control layer formed on a barrier in a display screen preparation method provided by an embodiment of the present invention;

[0039] Figure 9 Schematic diagram of removing a barrier in a display screen preparation method provided by an embodiment of the present invention.

[0040] Reference numerals in the accompanying drawings of the specification include:

[0041] 100 - screen body, 101 - light - emitting unit, 200 - light control layer, 201 - light - emitting port, 300 - light medium layer, 301 - first sub - light medium layer, 302 - second sub - light medium layer, 303 - third sub - light medium layer, 400 - barrier. Detailed implementation manners

[0042] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] This embodiment provides a display screen, including:

[0044] A screen body provided with light - emitting units;

[0045] A light control layer disposed on the light - emitting side of the screen body, having a light - emitting port corresponding to the light - emitting unit, such that the light emitted by the light - emitting unit exits through the light - emitting port, and at least part of the light emitted by the light - emitting unit is reflected by the cross - section of the light - emitting port.

[0046] The light - emitting units of the screen body are used to form pixels of the display screen. The cross - section of the light - emitting port is the inner side surface of the light - emitting port. The light - emitting port of the light control layer corresponding to the light - emitting unit can enable small - angle light emitted by the light - emitting unit to exit through the light - emitting port. The light - emitting port of the light control layer can enable large - angle light emitted by the light - emitting unit to be incident on the cross - section of the light - emitting port and exit after being reflected by the cross - section. The cross - section can control the exit direction of the large - angle light. Therefore, the light - emitting angle of the display screen can be controlled through the light control layer, and the light - emitting angle of the display screen can be reduced.

[0047] The small-angle light rays in the light emitted by the light-emitting unit refer to the light rays whose emission direction forms an angle less than a preset angle with the optical axis of the light-emitting unit, and the large-angle light rays in the light emitted by the light-emitting unit refer to the light rays whose emission direction forms an angle greater than or equal to the preset angle with the optical axis of the light-emitting unit. The light-emitting angle of the display screen refers to the angle between the maximum-angle light rays on both sides of the optical axis of the display screen, and the maximum-angle light rays are the emitted light rays with the largest angle between the emission direction and the optical axis of the display screen on one side of the optical axis of the display screen. Exemplarily, reference can be made to Figure 1 , Figure 1 FIG. Figure 1 is a schematic diagram of the light path of the light emitted by the light-emitting unit of a display screen provided in this embodiment passing through the light control layer, and the arrows in the figure indicate the light propagation direction. As shown in the figure, the small-angle light rays in the light emitted by the light-emitting unit 101 can directly exit through the light-emitting port 201, and the large-angle light rays are incident on the cross-section of the light-emitting port 201 and exit after being reflected by the cross-section.

[0048] In this embodiment, the cross-sectional shape of the light-emitting port 201 is not limited. The cross-sectional line corresponding to the cross-section in the longitudinal section of the light-emitting port 201 can be a straight line or a curve. In the embodiment where the cross-sectional line corresponding to the cross-section in the longitudinal section of the light-emitting port 201 is a curve, the emission direction of the light emitted by the light-emitting unit 101 can be more finely controlled through the cross-section of the light-emitting port 201.

[0049] According to the control requirements for the light-emitting angle of the display screen, the light-emitting port 201 can have a constant diameter along the direction away from the screen body 100, such as Figure 1 shown in the figure, or the light-emitting port 201 can have a gradually increasing diameter along the direction away from the screen body 100. Or the light-emitting port 201 can have a gradually decreasing diameter along the direction away from the screen body 100. Exemplarily, reference can be made to Figure 2 , Figure 2 FIG. Figure 2 is a schematic longitudinal section view of a display screen provided in Embodiment 1. As shown in the figure, it includes a screen body 100 and a light control layer 200. The light control layer 200 is disposed on the light-emitting side of the screen body 100. The light control layer 200 is provided with a light-emitting port 201 corresponding to the light-emitting unit 101. The light-emitting port 201 has a gradually decreasing diameter along the direction away from the screen body 100, and the large-angle light rays in the light emitted by the light-emitting unit 101 can be converged to reduce the light-emitting angle of the display screen. The arrows in the figure indicate the light propagation direction.

[0050] In this embodiment, the thickness of the light control layer 200 is not limited, and the cross-sectional shape of the light exit 201 of the light control layer 200 is not limited. In practical applications, it can be set according to the situation of the light-emitting unit 101. In this embodiment, the material of the light control layer 200 is not limited, as long as the cross-section of the light exit 201 formed by the light control layer 200 can reflect light. In some embodiments, the light control layer 200 includes a metal layer, so that the cross-section of the light exit 201 can reflect light. Metals with high reflectivity can be used to minimize light energy loss, and aluminum, silver, or titanium can be used but are not limited to. Exemplarily, the thickness of the light control layer 200 can be greater than or equal to 3 μm. In a specific example corresponding to Figure 3 the display screen shown, the thickness of the light control layer 200 is 3 - 4 μm, and the light exit angle of the display screen can be within ±30°.

[0051] In some embodiments, the light exit 201 can expose the light-emitting unit 101 corresponding to the light exit 201, so that the light emitted by the light-emitting unit 101 exits through the light exit 201. Exemplarily, such as Figure 2 the display screen shown. In some embodiments, the display screen may further include: a light medium layer 300 filled in the light exit 201, and the light medium layer 300 is used to reduce the refractive index difference between the light-emitting unit 101 and the outside air. The refractive index of the light-emitting unit 101 can be considered as the refractive index of the last medium layer that the light emitted by the light-emitting unit 101 passes through when it exits the light-emitting unit 101. When the light emitted by the light-emitting unit 101 exits the light-emitting unit 101, if the refractive index of the light-emitting unit 101 is greater than the refractive index of the outside medium, since the light may undergo total internal reflection when it enters from an optically denser medium to an optically thinner medium at this time, the greater the refractive index difference between the light-emitting unit 101 and the outside medium, the easier it is to occur total internal reflection at the interface between the two, which will reduce the light extraction efficiency. Reference can be made to Figure 3 Figure 3 FIG. 11 is a schematic longitudinal cross-sectional view of a display screen provided in Embodiment 2. As shown in the figure, a light medium layer 300 is provided in the light exit 201 of the display screen. The light emitted by the light-emitting unit 101 is refracted into the light medium layer 300 and further refracted from the light medium layer 300 to the outside air. By means of the light medium layer 300, the refractive index difference between the light-emitting unit 101 and the outside air is reduced, and the total internal reflection situation can be reduced, thereby improving the light extraction efficiency.

[0052] The light medium layer 300 should have light transmissibility so as not to affect the light emitted by the light-emitting unit 101 from passing through and ensure the brightness of the display screen. In this embodiment, the refractive index of the light medium layer 300 is not specifically limited, and in practical applications, it can be set according to the refractive index of the light-emitting unit 101. In this embodiment, the material of the light medium layer 300 is not limited, as long as its light transmissibility and refractive index meet the requirements. Silicon nitride Si3N4 or silicon dioxide SiO2 can be used but are not limited to.

[0053] In some embodiments, the surface of the optical medium layer 300 away from the screen body 100 is a smooth surface. The light emitted by the light-emitting unit 101 is refracted into the optical medium layer 300 and further refracted out from the surface of the optical medium layer 300 away from the screen body 100. The smooth surface of the optical medium layer 300 can reduce the scattering of light when passing through this surface, so as to avoid affecting the outgoing direction of light and the light-emitting angle of the display screen. For example, if there are uneven structures on this surface of the optical medium layer 300, it will cause strong scattering of light when passing through this surface.

[0054] In some embodiments, the optical medium layer 300 includes at least two sub-optical medium layers stacked in sequence, and the refractive indices of the at least two sub-optical medium layers increase or decrease in sequence. The light emitted by the light-emitting unit 101 is emitted after passing through each layer of sub-optical medium layers in the light-emitting port 201 in sequence. The refractive indices of each layer of sub-optical medium layers change in sequence, which helps to reduce the refractive index difference between the sub-optical medium layer closest to the light-emitting unit 101 and the light-emitting unit 101, and reduce the refractive index difference between adjacent two sub-optical medium layers, and reduce the refractive index difference between the sub-optical medium layer closest to the external air and the external air, which can reduce the occurrence of total reflection at each interface and improve the light-emitting efficiency. In this embodiment, the number of sub-optical medium layers included in the optical medium layer 300 is not limited, and the refractive indices of each sub-optical medium layer are not limited, and can be set according to the light-emitting unit 101 and the brightness requirements of the display screen in practical applications.

[0055] In some embodiments, if the refractive index of the light-emitting unit 101 is greater than the refractive index of the external air, then, along the direction away from the screen body 100, the refractive indices of the at least two sub-optical medium layers decrease in sequence. Exemplarily, reference can be made to Figure 4 , Figure 4 FIG. 11 is a schematic longitudinal cross-sectional view of a display screen provided in Embodiment 3. As shown in the figure, three sub-optical medium layers are filled in the light-emitting port 201 and stacked in sequence, including a first sub-optical medium layer 301, a second sub-optical medium layer 302, and a third sub-optical medium layer 303, and their refractive indices decrease in sequence. The refractive indices of each layer of sub-optical medium layers are all less than the refractive index of the light-emitting unit 101.

[0056] The light-emitting unit 101 may be an organic light-emitting diode. In this embodiment, the structure of the organic light-emitting diode is not limited and can be set according to display requirements in practical applications.

[0057] This embodiment also provides a method for manufacturing a display screen. Reference can be made to Figure 5 , Figure 5 FIG. 12 is a flowchart of a method for manufacturing a display screen provided in this embodiment. As shown in the figure, the method for manufacturing a display screen includes the following steps:

[0058] S11: Form a sacrificial layer on the light-emitting side of the screen body 100, and etch the sacrificial layer so that the sacrificial layer forms a light-blocking body 400 corresponding to the light-emitting unit 101, and the screen body 100 is provided with the light-emitting unit 101;

[0059] S12: Form a light control layer 200 on the side of the screen body 100 where the light-blocking body 400 is formed, and remove the light control layer 200 formed on the light-blocking body 400 and remove the light-blocking body 400, so that a light-emitting opening 201 corresponding to the light-emitting unit 101 is formed on the light control layer 200, so that the light emitted by the light-emitting unit 101 exits through the light-emitting opening 201, and at least part of the light emitted by the light-emitting unit 101 is reflected by the cross-section of the light-emitting opening 201.

[0060] The display screen obtained by the display screen preparation method of this embodiment. The small-angle light rays in the light emitted by the light-emitting unit can exit through the light-emitting opening. The light-emitting opening of the light control layer can make the large-angle light rays in the light emitted by the light-emitting unit enter the cross-section of the light-emitting opening and exit after being reflected by the cross-section. The cross-section can control the exit direction of the large-angle light rays. Therefore, the light-emitting angle of the display screen can be controlled through the light control layer, and the light-emitting angle of the display screen can be reduced.

[0061] When selecting the material of the sacrificial layer, it is necessary to consider that during the process of removing the sacrificial layer, it does not react with the screen body 100, the light-emitting unit 101, and does not react with the light control layer 200. Exemplarily, the sacrificial layer selection materials are amorphous silicon α-Si, silicon nitride Si3N4, or silicon dioxide SiO2.

[0062] In some embodiments, the etching of the sacrificial layer so that the sacrificial layer forms a light-blocking body 400 corresponding to the light-emitting unit 101 can be achieved through the following process, including the following steps:

[0063] S111: Etch the sacrificial layer using a wet etching method, retain the sacrificial layer in the area corresponding to the light-emitting unit 101, and remove the sacrificial layer in other areas;

[0064] S112: Etch the sacrificial layer in the area corresponding to the light-emitting unit 101 using a photolithography method to form the light-blocking body 400 corresponding to the light-emitting unit 101.

[0065] Form a sacrificial layer on the entire light-emitting side of the screen body 100, and the sacrificial layer can be formed by a deposition method. Then, the sacrificial layer in other areas can be removed by a wet etching method, and the sacrificial layer in the area corresponding to the light-emitting unit 101 can be retained. Further, the sacrificial layer in the area corresponding to the light-emitting unit 101 is etched more precisely so that the sacrificial layer corresponding to the light-emitting unit 101 forms a light-blocking body 400 with the required shape. Exemplarily, reference can be made to Figure 6 ,Figure 6 Schematic diagram of forming a barrier on one side of the screen body in a display screen manufacturing method provided in this embodiment. As shown in the figure, the longitudinal section of the light output port 201 of the required light control layer 200 of this display screen is a regular trapezoid, so the longitudinal section of the barrier 400 formed on the light output side of the screen body 100 is a regular trapezoid.

[0066] The light control layer 200 can be formed on the side of the screen body 100 where the barrier 400 is formed by a deposition method, and Physical Vapor Deposition (PVD) method can be used but is not limited to. The light control layer 200 can be a metal layer, and a metal with a high reflectivity can be used. Exemplarily, reference can be made to Figure 7 , Figure 7 Schematic diagram of forming a light control layer on one side of the screen body in a display screen manufacturing method provided in this embodiment.

[0067] The light control layer 200 formed on the barrier 400 can be removed by a Chemical Mechanical Planarization (CMP) method, which can be used but is not limited to. Exemplarily, reference can be made to Figure 8 , Figure 8 Schematic diagram of removing the light control layer formed on the barrier in a display screen manufacturing method provided in this embodiment.

[0068] The shape of the light output port 201 on the light control layer 200 is adjusted by the barrier 400. Exemplarily, reference can be made to Figure 9 , Figure 9 Schematic diagram of removing the barrier in a display screen manufacturing method provided in this embodiment. During the process of removing the barrier 400, reactions with the screen body 100 and the light-emitting unit 101 should be avoided. The barrier 400 can be removed by an etching method, and the wet etching method can be used but is not limited to remove the barrier 400.

[0069] In some embodiments, this display screen manufacturing method may further include the following steps:

[0070] S13: Form a light medium layer 300 in the light output port 201, and the light medium layer 300 is used to reduce the refractive index difference between the light-emitting unit 101 and the outside air.

[0071] The light medium layer 300 can be formed on the entire surface of the side of the screen body 100 where the light control layer 200 is formed. Further, the light medium layer 300 formed on the light control layer 200 is removed, and the light medium layer 300 in the light output port 201 is retained. The light medium layer 300 formed on the light control layer 200 can be removed by a Chemical Mechanical Planarization (CMP) method, which can be used but is not limited to.

[0072] In some embodiments, the optical medium layer 300 includes at least two sub-optical medium layers stacked in sequence, and the refractive indices of the at least two sub-optical medium layers are different. Accordingly, forming the optical medium layer 300 in the light outlet 201 includes: forming each of the at least two sub-optical medium layers in sequence on the side of the screen body 100 where the light control layer 200 is formed.

[0073] For the display screen and its manufacturing method of this embodiment, by providing a light control layer 200 on the light-emitting side of the screen body 100, the light control layer 200 is provided with a light outlet 201 corresponding to the light-emitting unit 101, and the cross-section of the light outlet 201 can reflect light. The light-emitting angle of the display screen can be controlled through the light control layer 200, and the light-emitting angle of the display screen can be reduced. This display screen can be applied to VR or AR devices and can improve the brightness of the whole machine. In addition, in order to reduce the light-emitting angle of the existing micro display screen, a scheme of setting a reflective cup or setting a microlens is adopted. However, the manufacturing process of a micron-level microlens is complex, and setting a reflective cup will increase the volume of the display screen. This display screen can adopt semiconductor technology, with high precision and low process difficulty. This display screen can be a micro display screen, such as a MicroLED device.

[0074] This embodiment also provides a head-mounted display device, including an optical element and the display screen according to any one of the above embodiments, wherein the optical element is arranged on the light-emitting path of the display screen.

[0075] For the head-mounted display device of this embodiment, the display screen adopted by it includes a screen body and a light control layer. The screen body is provided with a light-emitting unit, and the light control layer is arranged on the light-emitting side of the screen body and is provided with a light outlet corresponding to the light-emitting unit, so that the light emitted by the light-emitting unit exits through the light outlet. At least part of the light emitted by the light-emitting unit is reflected by the cross-section of the light outlet, so that the large-angle light rays emitted by the light-emitting unit are incident on the cross-section of the light outlet and exit after being reflected by the cross-section. Therefore, the exit direction of the large-angle light rays can be controlled through the cross-section, and the light-emitting angle of the display screen can be controlled through the light control layer, and the light-emitting angle of the display screen can be reduced.

[0076] The head-mounted display device of this embodiment can be a virtual reality head-mounted display device or an augmented reality head-mounted display device.

[0077] The above has introduced in detail a display screen, its manufacturing method, and a head-mounted display device provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A display screen, characterized in that, Comprising: A screen body provided with light-emitting units; A light control layer disposed on the light-emitting side of the screen body, having light-emitting openings corresponding to the light-emitting units, such that the light emitted by the light-emitting units exits through the light-emitting openings, and at least part of the light emitted by the light-emitting units is reflected by the cross-section of the light-emitting openings.

2. The display screen according to claim 1, wherein The caliber of the light-emitting openings gradually decreases along the direction away from the screen body.

3. The display screen according to claim 1, characterized in that, The light-emitting openings expose the light-emitting units corresponding to the light-emitting openings.

4. The display screen according to claim 1, wherein Further comprising: A light medium layer filled in the light-emitting openings, and the light medium layer is used to reduce the refractive index difference between the light-emitting units and the external air.

5. The display screen according to claim 4, wherein The surface of the light medium layer away from the screen body is a smooth surface.

6. The display screen according to claim 4, wherein The light medium layer comprises at least two sub-light medium layers stacked in sequence, and the refractive indices of the at least two sub-light medium layers increase or decrease in sequence.

7. The display screen according to any one of claims 1 to 6, characterized in that, The light control layer comprises a metal layer.

8. A method for preparing a display screen, characterized in that, Comprising: Forming a sacrificial layer on the light-emitting side of the screen body, and etching the sacrificial layer such that the sacrificial layer forms a blocking body corresponding to the light-emitting units, and the screen body is provided with the light-emitting units; Forming a light control layer on the side of the screen body where the blocking body is formed, and removing the light control layer formed on the blocking body and removing the blocking body, such that light-emitting openings corresponding to the light-emitting units are formed on the light control layer, and the light emitted by the light-emitting units exits through the light-emitting openings, and at least part of the light emitted by the light-emitting units is reflected by the cross-section of the light-emitting openings.

9. The method for manufacturing a display screen according to claim 8, wherein, The etching of the sacrificial layer such that the sacrificial layer forms a blocking body corresponding to the light-emitting units includes: Etching the sacrificial layer using a wet etching method, retaining the sacrificial layer in the area corresponding to the light-emitting units, and removing the sacrificial layer in other areas; Etching the sacrificial layer in the area corresponding to the light-emitting units using a photolithography method to form the blocking body corresponding to the light-emitting units.

10. The method for manufacturing a display screen according to claim 8, wherein, Further comprising: Forming a light medium layer in the light-emitting openings, and the light medium layer is used to reduce the refractive index difference between the light-emitting units and the external air.

11. The method for manufacturing a display screen according to claim 10, wherein, The light medium layer comprises at least two sub-light medium layers stacked in sequence, and the refractive indices of the at least two sub-light medium layers are different; The forming of the light medium layer in the light-emitting openings includes: Sequentially forming each of the at least two sub-light medium layers on the side of the screen body where the light control layer is formed.

12. A head-mounted display device, characterized in that, Comprising an optical element and the display screen according to any one of claims 1 to 7, wherein the optical element is disposed on the light-emitting path of the display screen.

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