Display panel, display module and virtual reality equipment

Abstract

The invention provides a display panel, a display module and virtual reality equipment. The display panel comprises a substrate, a driving circuit layer, a first electrode layer, a pixel defining layer, an organic light-emitting layer and a second electrode layer, the driving circuit layer is located on one side of the substrate; the first electrode layer is located on the side, away from the substrate, of the driving circuit layer and comprises a plurality of first electrodes, and the first electrodes are electrically connected with the driving circuit layer; the pixel defining layer is located on the side, away from the driving circuit layer, of the first electrode layer, the pixel defining layer comprises a plurality of openings exposing the first electrodes, the pixel defining layer is made of a light absorbing material, and the pixel defining layer comprises a main body part and a plurality of protruding parts located on the side, away from the first electrode layer, of the main body part; the organic light-emitting layer is located in the opening; the second electrode layer is located on one side of the organic light-emitting layer away from the first electrode layer.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel, a display module and a virtual reality device. Background Art

[0002] In virtual reality (VR) devices, by adopting a folded optical path solution, the thickness of the entire device can be reduced to nearly half of the thickness of the device using a Fresnel lens solution. The main principle of the folded optical path solution is to use the refraction, reflection, and polarization characteristics of light to reduce the physical length and weight of the optical system by folding the optical path, thereby improving the lightness and portability of the device. However, this folded optical path solution will greatly reduce the light output efficiency, and the ghosting problem also affects its better application.

[0003] The above information disclosed in this section is only for understanding the background of the inventive concept of the present disclosure and therefore the above information may contain information that does not constitute the prior art. Summary of the invention

[0004] In one aspect, a display panel is provided, which includes a substrate, a driving circuit layer, a first electrode layer, a pixel defining layer, an organic light-emitting layer and a second electrode layer; the driving circuit layer is located on one side of the substrate; the first electrode layer is located on a side of the driving circuit layer away from the substrate, the first electrode layer includes a plurality of first electrodes, and the first electrodes are electrically connected to the driving circuit layer; the pixel defining layer is located on a side of the first electrode layer away from the driving circuit layer, the pixel defining layer includes a plurality of openings exposing the first electrodes, the material of the pixel defining layer is a light-absorbing material, the pixel defining layer includes a main body and a plurality of protrusions located on a side of the main body away from the first electrode layer; the organic light-emitting layer is located in the opening; the second electrode layer is located on a side of the organic light-emitting layer away from the first electrode layer.

[0005] According to some exemplary embodiments, in a cross section along a direction from the protrusion to the main body, the shape of the protrusion includes any one of a triangle, a semicircle, and a semi-ellipse.

[0006] According to some exemplary embodiments, a distance between two adjacent protrusions that are respectively away from one end of the main body is greater than or equal to 1 micrometer and less than or equal to 2 micrometers.

[0007] According to some exemplary embodiments, the protrusion includes a bottom surface and a side surface, the bottom surface is in contact with the main body, and an angle between the side surface and the bottom surface is greater than or equal to 30 degrees and less than 90 degrees.

[0008] According to some exemplary embodiments, a material of the pixel defining layer includes a black resin-based material.

[0009] According to some exemplary embodiments, the second electrode layer covers the pixel defining layer and the organic light-emitting layer; or, the second electrode layer includes a plurality of second electrodes, and an orthographic projection of the second electrode on the substrate has no overlap with an orthographic projection of the pixel defining layer on the substrate.

[0010] On the other hand, a display module is provided, which includes the display panel, an optical functional layer, a phase retarder and a polarizer as described above; the optical functional layer is located on the light-emitting side of the display panel, and the optical functional layer is used to convert the light emitted by the display panel into a first right-handed circularly polarized light and a left-handed circularly polarized light, and transmit the first right-handed circularly polarized light and reflect the left-handed circularly polarized light; the phase retarder is located on the side of the optical functional layer away from the display panel; the polarizer is located on the side of the phase retarder away from the optical functional layer; wherein the second electrode layer is used to convert the left-handed circularly polarized light reflected by the optical functional layer into a second right-handed circularly polarized light.

[0011] According to some exemplary embodiments, the reflectivity of the second electrode layer is greater than or equal to 20% and less than or equal to 60%.

[0012] According to some exemplary embodiments, the material of the optical functional layer includes a mixture of cholesteryl esters, halides and carbonates, or includes a dendron molecular material containing a naphthalene ring.

[0013] On the other hand, a virtual reality device is provided, comprising the display module as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Other objects and advantages of the present disclosure will be apparent from the following description of the present disclosure with reference to the accompanying drawings and will help to have a comprehensive understanding of the present disclosure.

[0015] Figure 1 The figure schematically shows a schematic diagram of an outgoing light path of a display module in the related art.

[0016] Figure 2a and Figure 2b The schematic diagram shows the principle of ghosting generated by a display module in the related art.

[0017] Figure 3 The structural diagram of a display panel according to some embodiments of the present disclosure is schematically shown.

[0018] Figure 4The structure diagram of the pixel definition layer according to some embodiments of the present disclosure is schematically shown.

[0019] Figure 5 The structural diagrams of display panels according to other embodiments of the present disclosure are schematically shown.

[0020] Figure 6 The figure schematically shows a schematic diagram of an outgoing light path of a display module according to some embodiments of the present disclosure.

[0021] Figure 7 The figure schematically shows the outgoing light path of the display module according to some other embodiments of the present disclosure.

[0022] Figure 8 The figure schematically shows the outgoing light path of the display module according to some other embodiments of the present disclosure.

[0023] Fig. 9 The structural block diagram of a virtual reality device according to some embodiments of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0024] In the following description, for the purpose of explanation, many specific details are set forth to provide a comprehensive understanding of various exemplary embodiments. However, it is apparent that various exemplary embodiments may be implemented without these specific details or with one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, the specific shapes, configurations, and characteristics of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0025] In the accompanying drawings, the size and relative size of the elements may be exaggerated for the purpose of clarity and / or description. Thus, the size and relative size of each element are not necessarily limited to the size and relative size shown in the drawings. In addition, the same reference numerals represent the same elements.

[0026] When an element is described as being "on" another element, "connected to" another element, or "coupled to" another element, the element may be directly on, directly connected to, or directly coupled to another element, or there may be intermediate elements. However, when an element is described as being "directly on" another element, "directly connected to" another element, or "directly coupled to" another element, there are no intermediate elements. Other terms and / or expressions used to describe the relationship between elements should be interpreted in a similar manner, for example, "between" versus "directly between", "adjacent" versus "directly adjacent", or "on" versus "directly on", etc. In addition, the term "connected" may refer to a physical connection, an electrical connection, a communication connection, and / or a fluid connection.

[0027] It should be understood that, although the terms first, second, etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the exemplary embodiment, the first element may be named as the second element, and similarly, the second element may be named as the first element.

[0028] Figure 1 It is a schematic diagram of the output light path of a display module in the related art. Figure 2a and Figure 2b It is a schematic diagram of the principle of ghosting produced by a display module in the related art.

[0029] Reference Figure 1 In the related art, the display module includes a display panel 101, a beam splitter 102 (Beam Splitter, abbreviated as BS), a quarter wave plate 103 (Quarter-wave Plate, abbreviated as QWP), a polarization beam splitter 104 (Polarization Beam Splitter, abbreviated as PBS) and a polarizer 105 (Polarizer, abbreviated as POL). The light (s light and p light) is first emitted from the display panel 101, and then converted into 50% left-handed circular polarization (Left-handed Circular Polarization, abbreviated as LCP) and 50% right-handed circular polarization (Right-handed Circular Polarization, abbreviated as RCP) by the beam splitter 102, wherein the left-handed circular polarization LCP can pass through the beam splitter 102, and the right-handed circular polarization RCP cannot pass through the beam splitter 102, that is, the light efficiency is reduced by 50%. 50% of the left-handed circularly polarized light LCP is converted into s-light by the quarter wave plate 103. Since the polarization beam splitter 104 is an anti-s-transmitting p-polarizer, the s-light is reflected by the polarization beam splitter 104 and converted into the left-handed circularly polarized light LCP by the quarter wave plate 103 again. The left-handed circularly polarized light LCP passes through the beam splitter 102, and half of the light is transmitted and half of the light is reflected, and the light efficiency is reduced by 25%. The reflected light is converted into 25% of the right-handed circularly polarized light RCP due to phase reversal. 25% of the right-handed circularly polarized light RCP is converted into p-light by the quarter wave plate 103. Since the polarization beam splitter 104 is an anti-s-transmitting p-polarizer, the p-light can pass through the polarization beam splitter 104 and finally pass through the polarizer 105 to be emitted. That is, there is still 25% of the right-handed circularly polarized light RCP that can be emitted, but due to the loss of light during the propagation process, the actual light efficiency is less than 25%.

[0030] It should be noted that s-light refers to polarized light whose electric field vibration direction is perpendicular to the propagation direction of the light. P-light refers to polarized light whose electric field vibration direction is the same as the propagation direction of the light.

[0031] Reference Figure 2a , the light emitted by the display panel 101 is reflected back to the display panel 101 by the polarizer 105, and then reflected out again by the display panel 101, thereby generating a ghost image. Figure 2b When multiple film layers (beam splitter 102, ..., polarizer 105) are arranged on the light-emitting side of the display panel 101, the folded light path is transmitted and reflected between the multiple film layers, which may also produce ghost images.

[0032] From the above, it can be seen that in the relevant technology, the use of the folded optical path solution will greatly reduce the light output efficiency (less than 25%), the picture contrast will deteriorate, and there will be serious ghosting problems. In addition, the optical path is offset during the folding process (for example, there is a 0.1 micron deviation in the alignment accuracy during the module assembly process), which will be projected onto the screen and eventually to the human eye. It will produce a double image, commonly known as a ghost image. Or due to differences in the uniformity of the display panel preparation, or due to poor sealing of the entire machine's glasses rubber cover (i.e., there is ambient light leakage), ghosting will occur, resulting in a poor experience for VR devices.

[0033] Therefore, in order to solve at least one aspect of the above technical problems, the embodiments of the present disclosure provide a display panel, a display module and a virtual reality device, which are conducive to improving the ghosting problem, improving the light output efficiency of the folded light path, and enhancing the picture contrast.

[0034] Figure 3 is a schematic structural diagram of a display panel 20 according to some embodiments of the present disclosure. Figure 4 is a schematic structural diagram of a pixel defining layer 200 according to some embodiments of the present disclosure. Figure 5 is a schematic structural diagram of a display panel 20 according to some other embodiments of the present disclosure.

[0035] Reference Figure 3 and Figure 4The display panel 20 includes a substrate 30, a driving circuit layer 33, a first electrode layer 35, a pixel defining layer 200, an organic light emitting layer 36, and a second electrode layer 37. The driving circuit layer 33 is located on one side of the substrate 30. The first electrode layer 35 is located on the side of the driving circuit layer 33 away from the substrate 30. The first electrode layer 35 includes a plurality of first electrodes 351, and the first electrodes 351 are electrically connected to the driving circuit layer 33. The pixel defining layer 200 is located on the side of the first electrode layer 35 away from the driving circuit layer 33. The pixel defining layer 200 includes a plurality of openings 203 exposing the first electrodes 351. The material of the pixel defining layer 200 is a light absorbing material. The pixel defining layer 200 includes a main body 201 and a plurality of protrusions 202 located on the side of the main body 201 away from the first electrode layer 35. The organic light emitting layer 36 is located in the opening 203. The second electrode layer 37 is located on the side of the organic light emitting layer 36 away from the first electrode layer 35.

[0036] It should be noted that the pixel defining layer 200 is used to define a plurality of pixel regions (ie, light emitting regions) on the display panel 20. The first electrode layer 35 is, for example, an anode layer, and the second electrode layer 37 is, for example, a cathode layer.

[0037] It is understandable that in this embodiment, by setting the material of the pixel defining layer 200 to a light-absorbing material, the light reflected from the outgoing light path to the display panel 20 can be effectively absorbed, and the ambient light leakage caused by the poor sealing of the VR device can also be absorbed, thereby improving the ghost problem. By providing a plurality of raised portions 202 on the side of the main body 201 away from the first electrode layer 35 (specifically, the side close to the light-emitting side of the display panel 20), the light-absorbing area of ​​the pixel defining layer 200 is increased, and the light reflected from the outgoing light path to the display panel 20 and the ambient light leakage caused by the poor sealing of the VR device can be fully absorbed.

[0038] In some embodiments of the present disclosure, in a cross section along the direction from the protrusion 202 to the main body 201, the shape of the protrusion 202 includes any one of a triangle, a semicircle, and a semi-ellipse. Figure 3 As shown, the cross-sectional shape of the protrusion 202 is a triangle, that is, the protrusion 202 can be a cone or a triangular pyramid. In other embodiments, the protrusion 202 can also be a hemisphere or a semi-ellipsoid, and the embodiments of the present disclosure are not limited thereto.

[0039] In some embodiments of the present disclosure, referring to Figure 4 In the direction from the protruding portion 202 to the main body 201, the thickness h1 of the pixel defining layer 200 is greater than or equal to 1 micron and less than or equal to 2 microns. For example, the thickness h1 of the pixel defining layer 200 is any value of 1 micron, 1.2 microns, 1.5 microns, 1.7 microns, and 2 microns.

[0040] In some embodiments of the present disclosure, referring to Figure 4 The spacing d between two adjacent protrusions 202, respectively away from one end of the main body 201 (i.e., the top of the protrusion 202), is greater than or equal to 1 micron and less than or equal to 2 microns. For example, the spacing d between the tops of two adjacent protrusions 202 is any value of 1 micron, 1.2 microns, 1.5 microns, 1.7 microns, and 2 microns.

[0041] It can be understood that in this embodiment, by limiting the distance d between the tops of two adjacent protrusions 202 within the range of 1 micron to 2 microns, more protrusions 202 can be arranged within a unit area, thereby increasing the light absorption area of ​​the pixel defining layer 200, and since the size of the protrusions 202 is small, it can avoid affecting the film layer deposited on the pixel defining layer 200.

[0042] In some embodiments of the present disclosure, referring to Figure 4 The raised portion 202 includes a bottom surface S1 and a side surface S2, the bottom surface S1 contacts the main body 201, and the angle a between the side surface S2 and the bottom surface S1 is greater than or equal to 30 degrees and less than 90 degrees. For example, the angle a between the side surface S2 and the bottom surface S1 is any value of 30 degrees, 45 degrees, 60 degrees, 70 degrees, and 80 degrees.

[0043] It is understandable that when the light absorption rate of the material of the pixel defining layer 200 is less than 100%, the light reflected from the outgoing light path to the display panel 20 cannot be completely absorbed by the pixel defining layer 200, but since most of the light is absorbed by the pixel defining layer 200, a very small part of the light is not absorbed by the pixel defining layer 200, so no ghost problem will be caused. In this embodiment, by setting the angle a between the side surface S2 and the bottom surface S1 of the protrusion 202 to be greater than or equal to 30 degrees and less than 90 degrees, the light that is not absorbed by the pixel defining layer 200 can be reflected to the pixel area after irradiating the side surface S2, so as to increase the light output of the pixel area, thereby improving the light output efficiency of the display panel 20.

[0044] In some embodiments of the present disclosure, the material of the pixel defining layer 200 includes a black resin material. For example, the material of the pixel defining layer 200 is carbon black acrylic resin, that is, the pixel defining layer 200 is composed of carbon black and acrylic resin, but the embodiments of the present disclosure are not limited thereto.

[0045] It should be noted that, in the present embodiment, a pixel driving circuit is provided in the driving circuit layer 33. The pixel driving circuit may include a transistor and a storage capacitor. Further, the transistor may be a thin film transistor, and the thin film transistor may be selected from a top gate thin film transistor, a bottom gate thin film transistor or a double gate thin film transistor. The material of the active layer 3311 of the thin film transistor may be an amorphous silicon semiconductor material, a low temperature polycrystalline silicon semiconductor material, a metal oxide semiconductor material, an organic semiconductor material or other types of semiconductor materials. The thin film transistor may be an N-type thin film transistor or a P-type thin film transistor.

[0046] Exemplarily, the driving circuit layer 33 may include a semiconductor layer, a first gate insulating layer 332, a first metal layer, a second gate insulating layer 334, a second metal layer, an interlayer insulating layer 336, and a third metal layer stacked between the substrate 30 and the first electrode layer 35. Among them, the semiconductor layer can be used to form an active layer 3311 of a thin film transistor and a first plate 3312 of a storage capacitor. The first metal layer can be used to form a gate 3331 of a thin film transistor, and can also be used to form a second plate 3332 of a storage capacitor. The second metal layer can be used to form a third plate 335 of a storage capacitor. The third metal layer can be used to form a source 3381 and a drain 3382 of a thin film transistor, and can also be used to form a signal line 3383. The signal line 3383 is separated from the third electrode 335 by the insulating medium layer 337, and is thereby electrically connected to the second electrode 3332, that is, a first capacitor is formed between the second electrode 3332 and the first electrode 3312, and a second capacitor is formed between the second electrode 3332 and the third electrode 335, and the first capacitor and the second capacitor are connected in parallel to form a storage capacitor, thereby increasing the amount of charge stored in the storage capacitor.

[0047] Optionally, the driving circuit layer 33 may further include a protective layer 31 and a buffer layer 32 disposed between the substrate 30 and the semiconductor layer. The substrate 30 may be made of glass, the protective layer 31 may be made of polyimide, and the buffer layer 32 may be made of inorganic insulating materials such as silicon oxide and silicon nitride.

[0048] Optionally, the driving circuit layer 33 may further include a planarization layer 34 disposed between the third metal layer and the first electrode layer 35, and the planarization layer 34 may provide a planarized surface for the first electrode 351. Optionally, the material of the planarization layer 34 may be an organic material.

[0049] Optionally, refer to Figure 3, in a direction perpendicular to the plane where the substrate 30 is located, the thickness h2 of the organic light-emitting layer 36 is greater than or equal to 280 nanometers and less than or equal to 400 nanometers, for example, the thickness h2 of the organic light-emitting layer 36 is any value of 280 nanometers, 300 nanometers, 320 nanometers, 360 nanometers, and 400 nanometers. The organic light-emitting layer 36 may include an organic electroluminescent material layer, and may include one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer. The various film layers of the organic light-emitting layer 36 may be prepared by an evaporation process. Among them, the organic electroluminescent material layer includes a red light-emitting material layer, a green light-emitting material layer, and a blue light-emitting material layer.

[0050] In some embodiments of the present disclosure, Figure 3 As shown, the second electrode layer 37 covers the pixel defining layer 200 and the organic light emitting layer 36. In the direction perpendicular to the plane where the substrate 30 is located, the thickness h3 of the second electrode layer 37 is greater than or equal to 12 nanometers and less than or equal to 19 nanometers. For example, the thickness h3 of the second electrode layer 37 is any value among 12 nanometers, 14 nanometers, 16 nanometers, 18 nanometers, and 19 nanometers. That is, the second electrode layer 37 can be provided as a whole layer, covering the pixel defining layer 200 and the organic light emitting layer 36 at the same time. Since the pixel defining layer 200 includes a plurality of protrusions 202, the film layer (i.e., the second electrode layer 37) formed on the pixel defining layer 200 is contoured with the upper surface of the pixel defining layer 200 (i.e., the side surface of the pixel defining layer 200 away from the first electrode layer 35). In this embodiment, multiple organic light-emitting layers 36 share one second electrode layer 37, so that the second electrode layer 37 has fewer leads and a simpler preparation process. Moreover, since the second electrode layer 37 is very thin, it will not have much impact on the light absorption performance of the pixel defining layer 200.

[0051] In other embodiments of the present disclosure, Figure 5 As shown, the second electrode layer 37 includes a plurality of second electrodes 371, and the orthographic projection of the second electrode 371 on the substrate 30 does not overlap with the orthographic projection of the pixel defining layer 200 on the substrate 30. That is, in this embodiment, by patterning the second electrode layer 37 to form a plurality of second electrodes 371, the second electrodes 371 are only arranged on the organic light-emitting layer 36, and do not overlap with the arrangement area of ​​the pixel defining layer 200, that is, the second electrodes 371 are only arranged in the pixel area, so as to avoid affecting the light absorption performance of the pixel defining layer 200.

[0052] Figure 6 is a schematic diagram of an outgoing light path of a display module 2 according to some embodiments of the present disclosure. Figure 7 Schematic diagram of the outgoing light path of the display module 2 according to some other embodiments of the present disclosure. Figure 8 is a schematic diagram of an outgoing light path of a display module 2 according to some other embodiments of the present disclosure.

[0053] Reference Figure 6 The display module 2 includes a display panel 20, a beam splitter 102, a quarter wave plate 103, a polarization beam splitter 104, and a polarizer 105. Light (s light and p light) is first emitted from the display panel 20, and then converted into 50% left-handed circularly polarized light LCP and 50% right-handed circularly polarized light RCP by the beam splitter 102, wherein the left-handed circularly polarized light LCP can pass through the beam splitter 102, and the right-handed circularly polarized light RCP cannot pass through the beam splitter 102. The left-handed circularly polarized light LCP is converted into s light by the quarter wave plate 103. Since the polarization beam splitter 104 is an anti-s-transmitting p polarizer, the s light is reflected by the polarization beam splitter 104 and converted into left-handed circularly polarized light LCP by the quarter wave plate 103 again. The left-handed circularly polarized light LCP passes through the beam splitter 102, and half of the light is transmitted and half of the light is reflected. The reflected light is converted into right-handed circularly polarized light RCP due to phase inversion. The right circularly polarized light RCP is converted into p-light by the quarter wave plate 103 . Since the polarization beam splitter 104 is a reverse s-transmitting p-polarizer, the p-light can pass through the polarization beam splitter 104 and finally be emitted through the polarizer 105 .

[0054] In this embodiment, since the display panel 20 includes a pixel defining layer 200, the material of the pixel defining layer 200 is a light-absorbing material, which can effectively absorb the light reflected from the outgoing light path to the display panel 20, and can also absorb the ambient light leakage caused by the poor sealing of the VR device, thereby improving the ghost problem. In addition, by providing a plurality of protrusions 202 on the side of the main body 201 of the pixel defining layer 200 away from the first electrode layer 35 (specifically, the side close to the light-emitting side of the display panel 20), the light-absorbing area of ​​the pixel defining layer 200 is increased, and the light reflected from the outgoing light path to the display panel 20 and the ambient light leakage caused by the poor sealing of the VR device can be fully absorbed.

[0055] Reference Figure 7 The display module 2 includes a display panel 20, an optical function layer 21, a phase retarder 22 and a polarizer 23. The optical function layer 21 is located on the light-emitting side of the display panel 20. The optical function layer 21 is used to convert the light emitted by the display panel 20 into a first right-handed circularly polarized light RCP1 and a left-handed circularly polarized light LCP, and transmit the first right-handed circularly polarized light RCP1 and reflect the left-handed circularly polarized light LCP. The phase retarder 22 is located on the side of the optical function layer 21 away from the display panel 20. The polarizer 23 is located on the side of the phase retarder 22 away from the optical function layer 21. For the specific structure of the display panel 20, please refer to Figure 3 and Figure 5The display panel 20 includes a second electrode layer 37, and the second electrode layer 37 is used to convert the left-handed circularly polarized light LCP reflected by the optical functional layer 21 into a second right-handed circularly polarized light RCP2. The phase retarder 22 is used to convert the first right-handed circularly polarized light RCP1 and the second right-handed circularly polarized light RCP2 into linearly polarized light, i.e., p-light.

[0056] It can be understood that in this embodiment, the light (s light and p light) is first emitted from the display panel 20, and then converted into 50% left-handed circularly polarized light LCP and 50% first right-handed circularly polarized light RCP1 through the optical function layer 21, wherein the left-handed circularly polarized light LCP cannot pass through the optical function layer 21, and the first right-handed circularly polarized light RCP1 can pass through the optical function layer 21, and RCP1 is converted into directional p light through the phase delay plate 22, and finally emitted through the polarizer 23, that is, the light efficiency of this part of light is 50%. The 50% left-handed circularly polarized light LCP that is returned is reflected by the second electrode layer 37, and the reflected light is converted into the second right-handed circularly polarized light RCP2 of 50%*Rf (Rf is the reflectivity of the second electrode layer 37) due to phase inversion, and is emitted twice. The second right-handed circularly polarized light RCP2 of 50%*Rf can pass through the optical function layer 21. That is, the light efficiency that is finally transmitted to the observer's field of view is 50%*(1+Rf). That is, the light extraction efficiency of the display module 2 provided in the embodiment of the present disclosure can be increased to more than 50%, thereby reducing power consumption.

[0057] It can be understood that in this embodiment, since the first right-handed circularly polarized light RCP1 and the second right-handed circularly polarized light RCP2 are both converted into p-light after passing through the phase retarder 22, and there is no s-light, a layer of polarization beam splitter (anti-s-transmitting p-polarizer) can be omitted, thereby saving material costs.

[0058] It can be understood that since the material of the pixel defining layer 200 is set to a light-absorbing material and a plurality of protrusions 202 are set on the side of the pixel defining layer 200 close to the light-emitting side, the ghosting problem can be improved. At the same time, an optical functional layer 21 is also set on the light-emitting side of the display panel 20, which can improve the light-emitting efficiency of the display module 2, which not only reduces power consumption, but also effectively improves the picture contrast and improves the user experience.

[0059] In some embodiments of the present disclosure, the reflectivity of the second electrode layer 37 is greater than or equal to 20% and less than or equal to 60%. For example, the reflectivity of the second electrode layer 37 is any value of 20%, 30%, 40%, 50%, and 60%.

[0060] It should be noted that the reflectivity of the second electrode layer 37 is related to the light irradiated on the second electrode layer 37. For example, the reflectivity of the second electrode layer 37 can reach 30% to 35% when irradiated with blue light, 50% when irradiated with green light, and 50% to 60% when irradiated with red light. In addition, the reflectivity of the second electrode layer 37 can also be adjusted by adjusting the thickness of the second electrode layer 37, so that the reflectivity of the second electrode layer 37 is greater than or equal to 20% and less than or equal to 60%, but the embodiments of the present disclosure are not limited thereto.

[0061] In some embodiments of the present disclosure, the material of the optical functional layer 21 includes a mixture of cholesterol esters, halides and carbonates. Among them, cholesterol esters refer to ester compounds generated by reacting cholesterol with compounds such as fatty acids through esterification reactions, halides refer to compounds containing halogens (such as chlorine, bromine, and iodine), and carbonates refer to polymers containing carbonate groups in the molecular chain. Alternatively, the material of the optical functional layer 21 includes a dendron molecular material containing a naphthalene ring. Dendron molecular materials containing naphthalene rings include naphthalene-triphenylamine dendron molecules, photoreactive dendron polymers, etc. The embodiments of the present disclosure are not limited to this, and the material of the optical functional layer 21 may also include other polymer film materials with specific circularly polarized light response.

[0062] Reference Figure 8 , the display module 2 includes a display panel 101, an optical function layer 21, a phase retarder 22 and a polarizer 23. The optical function layer 21 is located at the light-emitting side of the display panel 101, and the optical function layer 21 is used to convert the light emitted by the display panel 101 into a first right-handed circularly polarized light RCP1 and a left-handed circularly polarized light LCP, and transmit the first right-handed circularly polarized light RCP1 and reflect the left-handed circularly polarized light LCP. The phase retarder 22 is located on the side of the optical function layer 21 away from the display panel 101. The polarizer 23 is located on the side of the phase retarder 22 away from the optical function layer 21. Among them, the display panel 101 can be an organic light-emitting diode display panel commonly used in the art. The display panel 101 includes a second electrode layer 37, and the second electrode layer 37 is used to convert the left-handed circularly polarized light LCP reflected by the optical function layer 21 into a second right-handed circularly polarized light RCP2. The phase retarder 22 is used to convert the first right-handed circularly polarized light RCP1 and the second right-handed circularly polarized light RCP2 into linearly polarized light, that is, p-light.

[0063] It can be understood that in this embodiment, the light (s light and p light) is first emitted from the display panel 101, and then converted into 50% left-handed circularly polarized light LCP and 50% first right-handed circularly polarized light RCP1 through the optical function layer 21, wherein the left-handed circularly polarized light LCP cannot pass through the optical function layer 21, and the first right-handed circularly polarized light RCP1 can pass through the optical function layer 21, and RCP1 is converted into directional p light through the phase delay plate 22, and finally emitted through the polarizer 23, that is, the light efficiency of this part of light is 50%. The 50% left-handed circularly polarized light LCP that is returned is reflected by the second electrode layer 37, and the reflected light is converted into the second right-handed circularly polarized light RCP2 of 50%*Rf (Rf is the reflectivity of the second electrode layer 37) due to phase inversion, and is emitted twice. The second right-handed circularly polarized light RCP2 of 50%*Rf can pass through the optical function layer 21. That is, the light efficiency that is finally transmitted to the observer's field of view is 50%*(1+Rf). That is, the light extraction efficiency of the display module 2 provided in the embodiment of the present disclosure can be increased to more than 50%, thereby reducing power consumption.

[0064] Fig. 9 is a structural block diagram of a virtual reality device 4 according to some embodiments of the present disclosure.

[0065] Reference Fig. 9 The virtual reality device 4 includes the display module 2 as described above. Please refer to the specific structure of the display module 2. Figures 6 to 8 And related instructions will not be repeated here.

[0066] It should be noted that in the related art, the substrate used in VR devices is a single crystal silicon wafer substrate, but due to the complex preparation process and uneven crystal quality, the cost is high. In this embodiment, a display module 2 is formed by using a display panel 20 including a substrate 30, a driving circuit layer 33, a first electrode layer 35, a pixel defining layer 200, an organic light-emitting layer 36, and a second electrode layer 37, that is, it can be optimized on the basis of the existing organic light-emitting diode (OLED) display panel 20 and applied to VR devices, thereby reducing production costs.

[0067] Although some embodiments according to the general inventive concept of the present disclosure have been illustrated and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A display panel, characterized in that: The display panel comprises: substrate; A driving circuit layer, located on one side of the substrate; A first electrode layer, located at a side of the driving circuit layer away from the substrate, the first electrode layer comprising a plurality of first electrodes, and the first electrodes are electrically connected to the driving circuit layer; a pixel defining layer, located on a side of the first electrode layer away from the driving circuit layer, the pixel defining layer comprising a plurality of openings exposing the first electrode, the material of the pixel defining layer being a light absorbing material, the pixel defining layer comprising a main body portion and a plurality of protrusions located on a side of the main body portion away from the first electrode layer; an organic light-emitting layer, located in the opening; and The second electrode layer is located on a side of the organic light-emitting layer away from the first electrode layer.

2. The display panel according to claim 1, characterized in that: In a cross section along a direction from the protrusion to the main body, the protrusion may have a shape of a triangle, a semicircle, or a semi-ellipse.

3. The display panel according to claim 1, characterized in that: The distance between two adjacent protrusions, respectively away from one end of the main body, is greater than or equal to 1 micron and less than or equal to 2 microns.

4. The display panel according to claim 1, characterized in that: The raised portion includes a bottom surface and a side surface, the bottom surface is in contact with the main body, and an angle between the side surface and the bottom surface is greater than or equal to 30 degrees and less than 90 degrees.

5. The display panel according to claim 1, characterized in that: The material of the pixel definition layer includes a black resin material.

6. The display panel according to any one of claims 1 to 5, characterized in that: The second electrode layer covers the pixel defining layer and the organic light emitting layer; or, The second electrode layer includes a plurality of second electrodes, and an orthographic projection of the second electrodes on the substrate does not overlap with an orthographic projection of the pixel defining layer on the substrate.

7. A display module, characterized in that: The display module comprises: The display panel according to any one of claims 1 to 6; an optical functional layer, located at the light-emitting side of the display panel, and configured to convert the light emitted by the display panel into first right-handed circularly polarized light and left-handed circularly polarized light, transmit the first right-handed circularly polarized light, and reflect the left-handed circularly polarized light; a phase retarder, located on a side of the optical functional layer away from the display panel; and A polarizer, located on a side of the phase retarder away from the optical functional layer; Wherein, the second electrode layer is used for converting the left-handed circularly polarized light reflected by the optical functional layer into second right-handed circularly polarized light.

8. The display module according to claim 7, characterized in that: The reflectivity of the second electrode layer is greater than or equal to 20% and less than or equal to 60%.

9. The display module according to claim 7, characterized in that: The material of the optical functional layer includes a mixture of cholesteryl ester, halide and carbonate, or includes a dendron molecular material containing a naphthalene ring.

10. A virtual reality device, characterized in that: The virtual reality device comprises a display module according to any one of claims 7-9.

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