Display panel, head-mounted display and manufacturing method of display panel

Abstract

The invention provides a display panel, a head-mounted display and a manufacturing method of the display panel, and relates to the technical field of display. The display panel comprises a plurality of sub-pixels, each sub-pixel comprises an anode, an organic light-emitting layer, a cathode and a micro lens, the organic light-emitting layer is located between the anode and the cathode, and the micro lens is located on the side, away from the anode, of the cathode; the sub-pixel further comprises a metal wire grid layer, the metal wire grid layer is located on the side, away from the anode, of the cathode, the metal wire grid layer comprises a plurality of metal wires arranged at intervals, and the metal wires are periodically arranged. The embodiment of the invention provides a display panel, a head-mounted display and a manufacturing method of the display panel so as to improve the light utilization rate.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel, a head mounted display and a method for manufacturing the display panel. Background Art

[0002] Augmented reality (AR) technology is also known as augmented reality technology. It is a relatively new technology that promotes the integration of real-world information and virtual-world information content. It simulates and processes physical information that is difficult to experience in the spatial range of the real world on the basis of computers and other scientific technologies, and superimposes virtual information content to effectively apply it in the real world. In this process, it can be perceived by human senses, thus achieving a sensory experience beyond reality. After the real environment and virtual objects overlap, they can exist simultaneously in the same picture and space. Augmented reality technology can not only effectively reflect the content of the real world, but also promote the display of virtual information content. These delicate contents complement and overlap each other. In visual augmented reality, users need to make the real world overlap with computer graphics on the basis of helmet displays, and after the overlap, they can fully see the real world around it. Augmented reality technology mainly includes new technologies and means such as multimedia, three-dimensional modeling and scene fusion. There is a clear difference between the information content provided by augmented reality and the information content that humans can perceive.

[0003] For display panels that realize augmented reality, improving light utilization is a very important issue. Summary of the invention

[0004] The present invention provides a display panel, a head mounted display and a method for manufacturing the display panel, so as to improve the light utilization rate.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, comprising a plurality of sub-pixels, wherein the sub-pixels include an anode, an organic light-emitting layer, a cathode, and a microlens, wherein the organic light-emitting layer is located between the anode and the cathode, and the microlens is located on a side of the cathode away from the anode;

[0006] The sub-pixel further includes a metal wire grid layer, the metal wire grid layer is located on a side of the cathode away from the anode, the metal wire grid layer includes a plurality of metal wires arranged at intervals, and the plurality of metal wires are arranged periodically.

[0007] In a second aspect, an embodiment of the present invention provides a head-mounted display, comprising the display panel described in the first aspect.

[0008] In a third aspect, an embodiment of the present invention provides a method for manufacturing a display panel, wherein the display panel includes a plurality of sub-pixels, and the manufacturing method includes:

[0009] sequentially forming a stacked anode, an organic light-emitting layer and a cathode;

[0010] A microlens and a metal material layer are formed on a side of the cathode away from the anode, and the metal material layer is etched to form a metal wire grid layer including a plurality of spaced metal wires; wherein the plurality of metal wires are periodically arranged.

[0011] The display panel provided by the embodiment of the present invention has a metal wire grid layer disposed on the side of the cathode away from the anode. The metal wire grid layer is integrated into the sub-pixel. The metal wire grid layer transmits P light and reflects S light. The anode reflects the light reflected by the metal wire grid layer again, and the light includes both P light and S light. The P light reflected by the anode can pass through the metal wire grid layer and be emitted outside the display panel, thereby improving the light utilization rate of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a partial structural schematic diagram of a head-mounted display in the related art;

[0013] Figure 2 A schematic diagram of a top view structure of a display panel provided by an embodiment of the present invention;

[0014] Figure 3 For along Figure 2 Schematic diagram of the cross-sectional structure along the AA' direction;

[0015] Figure 4 A schematic diagram of a top view structure of a metal wire grid layer provided in an embodiment of the present invention;

[0016] Figure 5 A schematic diagram of the light emitting principle of a display panel provided by an embodiment of the present invention;

[0017] Figure 6 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0018] Figure 7 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0019] Figure 8 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0020] Fig. 9 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0021] Fig.10 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0022] Fig.11 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0023] Fig.12 A schematic diagram of the structure of a head mounted display provided by an embodiment of the present invention;

[0024] Fig.13 A flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0025] Fig.14 A flow chart of another method for manufacturing a display panel provided by an embodiment of the present invention;

[0026] Fig.15 A schematic diagram of a manufacturing process of a display panel provided by an embodiment of the present invention;

[0027] Fig.16 A flow chart of another method for manufacturing a display panel provided by an embodiment of the present invention;

[0028] Fig.17 A schematic diagram of a manufacturing process of another display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] Figure 1 A partial structural diagram of a head mounted display in the related art, referring to Figure 1 The head mounted display includes a display panel 100 and a first polarizer 200. After the light emitted by the display panel 100 passes through the first polarizer 200, the brightness becomes 50% of the original linear polarized light. In practical applications, after passing through the first polarizer 200, the brightness of the light does not even reach 50% of the original, for example, it becomes 46% of the original.

[0031] Figure 2 A schematic diagram of a top view of a display panel provided by an embodiment of the present invention is shown. Figure 3 For along Figure 2 Schematic diagram of the cross-sectional structure in the AA' direction, refer to Figure 2 and Figure 3, the display panel includes a plurality of sub-pixels 102. The sub-pixel 102 includes an anode 10, an organic light-emitting layer 11, a cathode 12, and a microlens 30. The organic light-emitting layer 11 is located between the anode 10 and the cathode 12. When voltage is applied to the anode 10 and the cathode 12, holes and electrons are respectively transferred to the organic light-emitting layer 11, and are recombined in the organic light-emitting layer 11 to form excitons. The excitons migrate under the action of the electric field, transfer energy to the light-emitting material in the organic light-emitting layer 11, and excite the electrons in the light-emitting material to transition from the ground state to the excited state. The excited state energy generates photons through radiation deactivation, releasing light energy. The plurality of sub-pixels 102 may include a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit. The red light-emitting unit emits red light, the green light-emitting unit emits green light, and the blue light-emitting unit emits blue light. Thus, the display panel can realize color display by mixing red, green, and blue. The microlens 30 is located on the side of the cathode 12 away from the anode 10. The microlens 30 is a film layer that is conducive to light extraction, which improves the light extraction efficiency of the sub-pixel 102.

[0032] Figure 4 A schematic diagram of a top view structure of a metal wire grid layer provided in an embodiment of the present invention, Figure 5 A schematic diagram of the light emitting principle of a display panel provided in an embodiment of the present invention, referring to Figure 2-Figure 5 The sub-pixel 102 further includes a metal wire grid layer 40, which is located on the side of the cathode 12 away from the anode 10. The metal wire grid layer 40 includes a plurality of metal wires 43 arranged at intervals, and the plurality of metal wires 43 are arranged periodically. The direction extending along the metal wires is the direction in which the electric field component passes, and the direction perpendicular to the extension of the metal wires is the direction in which the electric field component is reflected.

[0033] For example, Figure 5 As shown, after the first light L1 is projected onto the metal wire grid layer 40, the polarized light (herein referred to as P light) parallel to the extension direction of the metal wire 43 converges into an outgoing light with a small angle (i.e., the second light L2). The polarized light (i.e., the third light L3, here referred to as S light) perpendicular to the extension direction of the metal wire 43 is reflected onto the anode 10. After being reflected by the anode 10, the fourth light L4 is formed. The P light in the fourth light L4 can pass through the metal wire grid layer 40 and be projected out to form the fifth light L5. The fifth light L5 is a newly added light projected out of the display panel relative to the related art, which improves the light utilization rate of the display panel.

[0034] In one example, the third light L3 is 50% of the brightness of the first light L1, the fourth light L4 is 50% of the brightness of the third light L3, and the fifth light L5 is 50% of the brightness of the fourth light L4. Thus, compared with the related art, the newly added fifth light L5 projected out of the display panel increases the original 50% transmittance of the display panel by 12.5% ​​to 62.5%, thereby improving the light utilization rate of the display panel.

[0035] The display panel provided by the embodiment of the present invention has a metal wire grid layer 40 disposed on the side of the cathode 12 away from the anode 10. The metal wire grid layer 40 is integrated into the sub-pixel 102. The metal wire grid layer 40 transmits P light and reflects S light. The anode 10 reflects the light reflected by the metal wire grid layer 40 again, and the cost includes both P light and S light. The P light reflected by the anode 10 can pass through the metal wire grid layer 40 and emit outside the display panel, thereby improving the light utilization rate of the display panel.

[0036] For example, reference Figure 2-Figure 5 , the display panel also includes a substrate 101. The sub-pixel 102 is located on the substrate 101. The multiple sub-pixels 102 are arranged in an array on the substrate 101. The embodiment of the present invention does not limit the arrangement of the multiple sub-pixels 102. In a direction perpendicular to the substrate 101, the microlens 30 covers at least a portion of the anode 10. In one embodiment, the vertical projection of the anode 10 on the substrate 101 may exceed the boundary of the vertical projection of the microlens 30 on the substrate 101. In another embodiment, the vertical projection of the anode 10 on the substrate 101 may be located within the boundary of the vertical projection of the microlens 30 on the substrate 101. It can be specifically set as needed.

[0037] For example, reference Figure 2-Figure 5 The microlens 30 may be hemispherical or hemispherical. When the microlens 30 is hemispherical, the surface of the microlens 30 away from the anode 10 is a spherical surface. The hemispherical microlens 30 has the same extraction efficiency for light within an azimuth angle of 360°, and the brightness gain of the sub-pixel 102 is the same at each azimuth angle. Therefore, the hemispherical microlens 30 is a more preferred embodiment.

[0038] Optionally, refer to Figure 2-Figure 5, the microlens 30 is located between the cathode 12 and the metal wire grid layer 40. The metal wire grid layer 40 is located on the outside of the microlens 30, and the metal wire grid layer 40 as a whole presents the shape of the outer surface of the microlens 30, for example, the metal wire grid layer 40 as a whole presents a spherical shape. The light projected onto the metal wire grid layer 40 on the outside of the microlens 30 can return along the original path and be projected onto the anode 10. The light reflected by the anode 10 will pass through the microlens 30 again and be projected onto the metal wire grid layer 40 on the outside of the microlens 30. By arranging the metal wire grid layer 40 on the side of the microlens 30 away from the anode 10, the propagation path of the light reflected by the metal wire grid layer 40 is controlled, thereby improving the light utilization rate of the display panel.

[0039] Optionally, refer to Figure 2-Figure 5 In the metal wire grid layer 40, a first groove 41 is formed between adjacent metal wires 43. The first groove 41 is opened along the second direction X2, and the second direction X2 is a direction perpendicular to the plane where the anode 10 is located. The first groove 41 extends along the second direction X2, and the depth direction of the first groove 41 is perpendicular to the plane where the anode 10 is located. In the process of manufacturing the metal wire grid layer 40, a layer of metal material layer is first formed, and the metal material layer is etched to form the first groove 41. In the embodiment of the present invention, the depth direction of the first groove 41 is perpendicular to the plane where the anode 10 is located, so that plasma etching and other processes can be used to etch the metal material layer along the second direction X2, thereby simplifying the manufacturing process of the metal wire grid layer 40.

[0040] Optionally, refer to Figure 3 , along the second direction X2, the depth of the first groove 41 is a first depth D1, and the first depth D1 is greater than or equal to 50nm and less than or equal to 400nm. It should be noted that, since each first groove 41 is opened along the second direction X2, the first groove 41 at each position of the metal wire grid layer 40 may have a different first depth D1.

[0041] Optionally, refer to Figure 3 and Figure 4 The plurality of first grooves 41 are arranged along the first direction X1. The width of the first grooves 41 along the first direction X1 is a first width D2. The first width D2 is greater than or equal to 50 nm and less than or equal to 400 nm. The first direction X1 is parallel to the plane where the anode 10 is located.

[0042] For example, reference Figure 3 and Figure 4 The first grooves 41 may have the same first width D2 at various positions of the metal wire grid layer 40. Thus, along the tangential direction (that is, the circumferential direction, the tangential direction is perpendicular to the radial direction), the plurality of metal wires 43 are periodically arranged at equal intervals.

[0043] For example, reference Figure 3-Figure 5 The display panel further includes a protective layer 50, which fills the first groove 41, thereby setting the surface of the metal wire grid layer 40 away from the anode 10 to be a flat surface. The metal wire grid layer 40 is protected to reduce the shape change of the first groove 41, that is, to reduce the position change between two adjacent metal wires 43. Figure 3 As shown, the protection layer 50 does not cover the metal line 43 .

[0044] Figure 6 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention, referring to Figure 6 , the protective layer 50 is located on the side of the metal wire grid layer 40 away from the anode 10. The protective layer 50 fills the first groove 41 and covers the metal wire 43. Thus, the protective layer 50 protects the metal wire grid layer 40 and reduces the shape change of the first groove 41. The protective layer 50 protects the metal wire 43 to prevent the metal wire 43 from being corroded by water vapor and oxygen, thereby improving the service life and stability of the metal wire grid layer 40.

[0045] In one embodiment, a protection layer 50 may be provided for each sub-pixel 102 . In another embodiment, a protection layer 50 may be provided for a plurality of sub-pixels 102 , and the protection layer 50 covers the metal wire grid layer 40 in the plurality of sub-pixels 102 .

[0046] Optionally, refer to Figure 3 and Figure 6 The refractive index of the protective layer 50 is lower than that of the microlens 30, which can convert the light with a large viewing angle into the light with a small angle for emission, thereby increasing the light emission rate. When the P light passes through the metal wire grid layer 40 and is emitted to the outside of the display panel, the protective layer 50 disposed on the outside of the microlens 30 has a smaller refractive index, which converts the light with a large viewing angle into the light with a small angle for emission, thereby improving the light extraction efficiency, that is, improving the light emission rate of the display panel, and improving the light utilization rate of the display panel.

[0047] Exemplarily, the refractive index of the microlens 30 is greater than or equal to 1.6, and the refractive index of the protective layer 50 is less than or equal to 1.4.

[0048] Figure 7 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention, referring to Figure 7, the surface of the microlens 30 away from the anode 10 is a spherical surface. In the metal wire grid layer 40, a first groove 41 is formed between adjacent metal wires 43. The first groove 41 extends along the radial direction of the spherical surface. The depth direction of the first groove 41 is along the radial direction of the spherical surface. That is, the first groove 41 is opened along the radial direction of the microlens 30. The first groove 41 is formed by the gap between adjacent metal wires 43. In one example, the bottom of the first groove 41 is flush with the surface of the microlens 30 away from the anode 10. The top of the first groove 41 is flush with the surface of the metal wire 43 away from the anode 10. Along the radial direction of the microlens 30, the distance between the top of the first groove 41 and the center of the microlens 30 is greater than the distance between the surface of the microlens 30 away from the anode 10 and the center of the microlens 30. That is, the first groove 41 is formed on the outer side of the surface of the microlens 30 away from the anode 10.

[0049] Optionally, refer to Figure 7 , along the radial direction of the spherical surface, the depth of the first groove 41 is a first depth D1, and the first depth D1 is greater than or equal to 50nm and less than or equal to 400nm. Since each first groove 41 is opened along the radial direction of the spherical surface, the first groove 41 at each position of the metal wire grid layer 40 can have the same first depth D1.

[0050] Optionally, referring to FIG7 , along the tangent direction of the spherical surface, the width of the first groove 41 is a first width D2 , and the first width D2 is greater than or equal to 50 nm and less than or equal to 200 nm.

[0051] For example, reference Figure 7 The first grooves 41 may have the same first width D2 at various positions of the metal wire grid layer 40. Thus, along the tangential direction (that is, the circumferential direction, the tangential direction is perpendicular to the radial direction), the plurality of metal wires 43 are periodically arranged at equal intervals.

[0052] Figure 8 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention, referring to Figure 8, a plurality of second grooves 42 are provided on the surface of the microlens 30 away from the anode 10. The second groove 42 is formed by the surface of the microlens 30 away from the anode 10, which is concave toward the anode 10. The top of the second groove 42 is flush with the surface of the microlens 30 away from the anode 10. Along the radial direction of the microlens 30, the distance between the bottom of the second groove 42 and the center of the microlens 30 is smaller than the distance between the surface of the microlens 30 away from the anode 10 and the center of the microlens 30. That is to say, the second groove 42 is formed on the inner side of the surface of the microlens 30 away from the anode 10. The metal wire 43 is provided in the second groove 42. In an embodiment of the present invention, a plurality of second grooves 42 arranged at intervals are provided on the outer surface of the microlens 30, and a metal wire 43 is provided in the second groove 42, so that a plurality of metal wires 43 arranged at intervals form a metal wire grid layer 40. Among them, the depth direction of the second groove 42 can be as follows: Figure 8 As shown in , along the radial direction of the microlens 30. Alternatively, in other embodiments, the depth direction of the second groove 42 may be along the second direction X2.

[0053] Optionally, refer to Figure 2-Figure 8 , multiple metal wires 43 are symmetrically arranged about the mid-vertical plane K1 (shown as a dotted line in the cross-sectional view). The mid-vertical plane K1 is perpendicular to the plane where the anode 10 is located, and parallel to the extension direction of the metal wire 43. The metal wire grid layer 40 is symmetrically arranged about the mid-vertical plane K1, and the metal wire grid layer 40 is bilaterally symmetrical, and evenly transmits and reflects the light projected to the left side of the metal wire grid layer 40, and evenly transmits and reflects the light projected to the right side of the metal wire grid layer 40. The light utilization rate of the display panel is improved.

[0054] Exemplarily, at least one of the anode 10 , the organic light emitting layer 11 , and the microlens 30 may be symmetrically arranged about the mid-vertical plane K1 .

[0055] Optionally, refer to Figure 3 , the microlens 30 covers the opening of the sub-pixel 102 (at Figure 3 The opening of the sub-pixel 102 is not shown in the figure, and the opening of the sub-pixel 102 can be defined by the opening of the pixel defining layer. The organic light-emitting layer 11 is arranged in the opening of the pixel defining layer, thereby forming the opening of the sub-pixel 102. The opening of the sub-pixel 102 is the light-emitting area of ​​the sub-pixel 102. The light emitted from the opening of the sub-pixel 102 passes through the microlens 30 and is emitted to the outside of the display panel. The diameter of the microlens 30 is greater than 5μm and less than 10μm. The opening size of the sub-pixel 102 is slightly smaller than the diameter of the microlens 30. The opening size of the sub-pixel 102 is small, and the display panel provided in an embodiment of the present invention can be a micro-OLED display panel.

[0056] Fig. 9A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention, referring to Fig. 9 , the microlens 30 is located on the side of the metal wire grid layer 40 away from the anode 10. The light emitted by the organic light-emitting layer 11 is projected onto the metal wire grid layer 40, wherein the P light passes through the metal wire grid layer 40, continues to propagate to the microlens 30, and is emitted out of the display panel through the microlens 30. The S light in the light projected onto the metal wire grid layer 40 is reflected by the metal wire grid layer 40. The cost after the anode 10 reflects the light reflected by the metal wire grid layer 40 again includes both P light and S light. The P light reflected by the anode 10 can pass through the metal wire grid layer 40 and be emitted out of the display panel, thereby improving the light utilization rate of the display panel.

[0057] Optionally, refer to Fig. 9 The sub-pixel 102 further includes an encapsulation layer 20, which is located between the microlens 30 and the cathode 12. The encapsulation layer 20 covers the cathode 12, thereby protecting the anode 10, the organic light-emitting layer 11 and the cathode 12 from corrosion by water vapor and oxygen. The metal wire grid layer 40 is located between the microlens 30 and the encapsulation layer 20.

[0058] For example, reference Fig. 9 The display panel further includes a protective layer 50, which fills the first groove 41, thereby setting the surface of the metal wire grid layer 40 away from the anode 10 to a flat surface. It is convenient to form the microlens 30 on the flat surface. The protective layer 50 protects the metal wire grid layer 40 and reduces the shape change of the first groove 41. Fig. 9 As shown, the protection layer 50 does not cover the metal line 43 .

[0059] Fig.10 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention, referring to Fig.10 , the protective layer 50 is located on the side of the metal wire grid layer 40 away from the anode 10. The protective layer 50 fills the first groove 41 and covers the metal wire 43. Thus, the protective layer 50 protects the metal wire grid layer 40 and reduces the shape change of the first groove 41. The protective layer 50 protects the metal wire 43 to prevent the metal wire 43 from being corroded by water vapor and oxygen, thereby improving the service life and stability of the metal wire grid layer 40.

[0060] Fig.11 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention, referring to Fig.11The sub-pixel 102 further includes an insulating layer 13, a metal wire grid layer 40 is located between the encapsulation layer 20 and the cathode 12, and the insulating layer 13 is located between the metal wire grid layer 40 and the cathode 12. The insulating layer 13 serves to electrically insulate the metal wire grid layer 40 from the cathode 12, thereby preventing the electrically insulated metal wire grid layer 40 from being electrically connected to the cathode 12, and ensuring that the electrical properties of the cathode 12 are not affected by the metal wire grid layer 40. The metal wire grid layer 40 is disposed between the encapsulation layer 20 and the cathode 12, and the encapsulation layer 20 can also protect the metal wire grid layer 40, thereby improving the stability of the metal wire grid layer 40.

[0061] Exemplarily, the cathode 12 , the insulating layer 13 and the encapsulation layer 20 may be shared by a plurality of sub-pixels 102 . In other words, the cathode 12 , the insulating layer 13 and the encapsulation layer 20 are a whole film layer, covering the anodes 10 of the plurality of sub-pixels 102 .

[0062] Optionally, the material of the metal wire 43 includes at least one of aluminum, titanium and silver. Aluminum, titanium and silver have good electrical conductivity and certain mechanical strength, which can meet the requirements of manufacturing the metal wire grid layer 40.

[0063] Fig.12 A schematic diagram of the structure of a head mounted display provided by an embodiment of the present invention, referring to Fig.12 The head mounted display includes the display panel 100 in the above embodiment. Compared with the related art in which the first polarizer 200 is attached to the display panel 100, the display panel 100 provided by the embodiment of the present invention integrates the metal wire grid layer 40 into the sub-pixel 102. The light utilization rate of the display panel is improved. Thus, the light utilization rate of the head mounted display is improved.

[0064] For example, reference Fig.12, the head mounted display further comprises a flat glass 300, a second polarizer 400, a polarizing reflective film 500, a quarter wave plate 600 and a semi-reflective semi-transmissive film 700. The second polarizer 400 and the polarizing reflective film 500 are arranged on the flat glass 300, and the second polarizer 400 and the polarizing reflective film 500 are located on the side of the flat glass 300 facing the display panel 100. The second polarizer 400 is located between the polarizing reflective film 500 and the flat glass 300. The quarter wave plate 600 and the semi-reflective semi-transmissive film 700 include a curved surface. The quarter wave plate 600 and the semi-reflective semi-transmissive film 700 are located on the reflective light path of the semi-reflective semi-transmissive film 700. On the one hand, after the light emitted by the display panel 100 is reflected by the polarizing reflective film 500, it passes through the quarter wave plate 600 and is reflected back to the polarizing reflective film 500 by the semi-reflective semi-transmissive film 700. Through the flat glass 300, the second polarizer 400 and the polarizing reflective film 500, the user can observe the image displayed by the display panel 100. On the other hand, the external ambient light can pass through the semi-transmissive film 700, the quarter-wave plate 600, the polarizing reflective film 500, the second polarizer 400 and the flat glass 300, so that the user can observe the image in the external environment. In this way, the head mounted display realizes the function of enhanced display.

[0065] Fig.13 A flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention, referring to Figure 2-Figure 13 , the manufacturing method of the display panel includes:

[0066] S101, sequentially forming a stacked anode, an organic light-emitting layer and a cathode.

[0067] In this step, the anode 10 may be formed on the substrate 101 first, and then the organic light-emitting layer 11 may be formed on the anode 10. On the organic light-emitting layer 11, the cathode 12 may be formed.

[0068] S102, forming a microlens and a metal material layer on a side of the cathode away from the anode, and etching the metal material layer to form a metal wire grid layer including a plurality of spaced metal wires; wherein the plurality of metal wires are periodically arranged.

[0069] In this step, a microlens 30 and a metal wire grid layer 40 are formed on the side of the cathode 12 away from the anode 10. The step of forming the metal wire grid layer 40 includes: forming a metal material layer, and etching the metal material layer to form a metal wire grid layer 40 including a plurality of spaced metal wires. In one embodiment, the step of forming the microlens 30 may be located before the step of forming the metal wire grid layer 40. In another embodiment, the step of forming the microlens 30 may be located after the step of forming the metal wire grid layer 40.

[0070] Fig.14A flow chart of another method for manufacturing a display panel provided by an embodiment of the present invention, Fig.15 A schematic diagram of a manufacturing process of a display panel provided by an embodiment of the present invention, referring to Figure 3 , Fig.14 and Fig.15 , the manufacturing method of the display panel includes:

[0071] S201, sequentially forming a stacked anode, an organic light-emitting layer and a cathode.

[0072] refer to Fig.15 , forming a stacked anode 10, an organic light-emitting layer 11 and a cathode 12 in sequence.

[0073] S202, forming a microlens on a side of the cathode away from the anode.

[0074] For example, reference Fig.15 , an encapsulation layer 20 is formed on the cathode 12 . Thereafter, a microlens 30 is formed on the encapsulation layer 20 .

[0075] S203 , forming a metal material layer on a side of the microlens away from the anode.

[0076] refer to Fig.15 , a metal material layer 401 is formed on the surface of the microlens 30. In one embodiment, one metal material layer 401 may be formed for each microlens 30. In another embodiment, one metal material layer 401 may be formed for a plurality of microlenses 30. The metal material layer 401 generally presents the shape of the outer surface of the microlens 30.

[0077] S204 , etching the metal material layer to form a metal wire grid layer including a plurality of spaced metal wires.

[0078] For example, reference Fig.15 A first groove 41 is formed along a second direction X2, where the second direction X2 is a direction perpendicular to the plane where the anode 10 is located. The process of etching the metal material layer 401 may be, for example, plasma etching or the like.

[0079] In other implementations, the first groove 41 may be opened along the radial direction of the microlens 30 .

[0080] S205 , forming a protective layer on a side of the metal wire grid layer away from the anode.

[0081] refer to Figure 3 and Fig.15A protective layer 50 is formed on the side of the metal wire grid layer 40 away from the anode 10. In one embodiment, the protective layer 50 fills the first groove 41 and does not cover the metal wire 43. In another embodiment, the protective layer 50 fills the first groove 41 and covers the metal wire 43.

[0082] In the embodiment of the present invention, the microlens 30 is formed first, and then the metal wire grid layer 40 is formed. The light projected to the metal wire grid layer 40 outside the microlens 30 can return along the original path and project to the anode 10. The light reflected by the anode 10 will pass through the microlens 30 again and project to the metal wire grid layer 40 outside the microlens 30. By arranging the metal wire grid layer 40 on the side of the microlens 30 away from the anode 10, the propagation path of the light reflected by the metal wire grid layer 40 is controlled, thereby improving the light utilization rate of the display panel.

[0083] In one embodiment, illustratively, reference Figure 8 and Fig.15 After forming the microlens 30 on the side of the cathode 12 away from the anode 10. The method for manufacturing the display panel further includes: forming a second groove 42 on the surface of the microlens 30. Forming a metal material layer 401 on the side of the microlens away from the anode. Etching the metal material layer 401 to form a metal wire grid layer 40 including a plurality of spaced metal wires.

[0084] Fig.16 A flow chart of another method for manufacturing a display panel provided by an embodiment of the present invention, Fig.17 A schematic diagram of another display panel manufacturing process provided by an embodiment of the present invention, referring to Fig. 9 , Fig.16 and Fig.17 , the manufacturing method of the display panel includes:

[0085] S301, sequentially forming a stacked anode, an organic light-emitting layer and a cathode.

[0086] refer to Fig.17 , forming a stacked anode 10, an organic light-emitting layer 11 and a cathode 12 in sequence.

[0087] S302, forming a metal material layer on a side of the cathode away from the anode.

[0088] For example, reference Fig.17 , a packaging layer 20 is formed on the cathode 12 , and a metal material layer 401 is formed on the packaging layer 20 .

[0089] S303 , etching the metal material layer to form a metal wire grid layer including a plurality of spaced metal wires.

[0090] refer to Fig.17, the metal material layer 401 is etched to form a metal wire grid layer 40 including a plurality of spaced metal wires.

[0091] Optionally, after etching the metal material layer 401 to form the metal wire grid layer 40 including a plurality of spaced metal wires, a protection layer 50 may be formed to fill the first groove 41 of the metal wire grid layer 40 .

[0092] S304 , forming a microlens on a side of the metal wire grid layer away from the anode.

[0093] refer to Fig. 9 and Fig.17 A microlens 30 is formed on a side of the metal wire grid layer 40 away from the anode 10 .

[0094] In one embodiment, illustratively, reference Fig.11 and Fig.17 , after sequentially forming the stacked anode 10, the organic light-emitting layer 11 and the cathode 12. The method for manufacturing the display panel also includes: forming an insulating layer 13 on the cathode 12. Forming a metal material layer 401 on the insulating layer 13. Etching the metal material layer 401 to form a metal wire grid layer 40 including a plurality of spaced metal wires. Forming an encapsulation layer 20 on the metal wire grid layer 40. Forming a microlens 30 on the encapsulation layer 20.

[0095] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: The method comprises a plurality of sub-pixels, wherein the sub-pixels comprise an anode, an organic light-emitting layer, a cathode and a micro-lens, wherein the organic light-emitting layer is located between the anode and the cathode, and the micro-lens is located on a side of the cathode away from the anode; The sub-pixel further includes a metal wire grid layer, the metal wire grid layer is located on a side of the cathode away from the anode, the metal wire grid layer includes a plurality of metal wires arranged at intervals, and the plurality of metal wires are arranged periodically.

2. The display panel according to claim 1, characterized in that: The microlens is located between the cathode and the metal wire grid layer.

3. The display panel according to claim 2, characterized in that: In the metal wire grid layer, a first groove is formed between adjacent metal wires; The first groove extends in a direction perpendicular to the plane where the anode is located.

4. The display panel according to claim 3, characterized in that: Along a direction perpendicular to the plane where the anode is located, a depth of the first groove is greater than or equal to 50 nm and less than or equal to 400 nm; And / or, a plurality of the first grooves are arranged along a first direction, and along the first direction, a width of the first grooves is greater than or equal to 50 nm and less than or equal to 400 nm; and the first direction is parallel to a plane where the anode is located.

5. The display panel according to claim 2, characterized in that: The surface of the microlens away from the anode is a spherical surface; In the metal wire grid layer, a first groove is formed between adjacent metal wires; The first groove extends along the radial direction of the spherical surface.

6. The display panel according to claim 5, characterized in that: Along the radial direction of the spherical surface, the depth of the first groove is greater than or equal to 50 nm and less than or equal to 400 nm; And / or, along the tangent direction of the spherical surface, the width of the first groove is greater than or equal to 50 nm and less than or equal to 200 nm.

7. The display panel according to claim 2, characterized in that: A plurality of second grooves are arranged on the surface of the microlens away from the anode, and the metal wires are arranged in the second grooves.

8. The display panel according to claim 1, characterized in that: The plurality of metal wires are symmetrically arranged about the mid-vertical plane; The mid-vertical plane is perpendicular to the plane where the anode is located, and parallel to the extension direction of the metal wire.

9. The display panel according to claim 1, characterized in that: A protection layer is also included, and the protection layer is located on a side of the metal wire grid layer away from the anode.

10. The display panel according to claim 9, characterized in that: The refractive index of the protection layer is smaller than the refractive index of the microlens.

11. The display panel according to claim 1, characterized in that: The diameter of the microlens is greater than 5 μm and less than 10 μm.

12. The display panel according to claim 1, characterized in that: The microlens is located on a side of the metal wire grid layer away from the anode.

13. The display panel according to claim 12, characterized in that: The sub-pixel further includes an encapsulation layer, wherein the encapsulation layer is located between the microlens and the cathode; The metal wire grid layer is located between the microlens and the packaging layer; or, The sub-pixel further includes an insulating layer, the metal wire grid layer is located between the encapsulation layer and the cathode, and the insulating layer is located between the metal wire grid layer and the cathode.

14. The display panel according to claim 1, characterized in that: The material of the metal wire includes at least one of aluminum, titanium and silver.

15. A head mounted display, characterized in that: A display panel comprising any one of claims 1-14.

16. A method for manufacturing a display panel, characterized in that: The display panel includes a plurality of sub-pixels, and the manufacturing method includes: sequentially forming a stacked anode, an organic light-emitting layer and a cathode; A microlens and a metal material layer are formed on a side of the cathode away from the anode, and the metal material layer is etched to form a metal wire grid layer including a plurality of spaced metal wires; wherein the plurality of metal wires are periodically arranged.

17. The manufacturing method according to claim 16, characterized in that: A microlens and a metal material layer are formed on a side of the cathode away from the anode, and the metal material layer is etched to form a metal wire grid layer including a plurality of spaced metal wires, including: forming a microlens on a side of the cathode away from the anode; forming the metal material layer on a side of the microlens away from the anode; The metal material layer is etched to form a metal wire grid layer including a plurality of metal wires arranged at intervals.

18. The manufacturing method according to claim 16, characterized in that: After etching the metal material layer to form a metal wire grid layer including a plurality of spaced metal wires, the manufacturing method further includes: A protection layer is formed on a side of the metal wire grid layer away from the anode.

19. The manufacturing method according to claim 16, characterized in that: A microlens and a metal material layer are formed on a side of the cathode away from the anode, and the metal material layer is etched to form a metal wire grid layer including a plurality of spaced metal wires, including: forming the metal material layer on a side of the cathode away from the anode; Etching the metal material layer to form a metal wire grid layer including a plurality of spaced metal wires; The microlens is formed on a side of the metal wire grid layer away from the anode.

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