Display module and electronic equipment

Abstract

The invention provides a display module and electronic equipment, the display module comprises a first display screen and a second display screen, the directions from light emitting sides to backlight sides of the first display screen and the second display screen are the same, and the second display screen is located on the backlight side of the first display screen; the first display screen comprises a light-transmitting part and a first display part, and the projection of the second display screen in the thickness direction of the display module covers the light-transmitting part; the pixel density of the first display screen is smaller than that of the second display screen. The display module is formed by splicing the first display screen and the second display screen, so that the total area of the display module is large, and the requirement of a large field angle can be met. In addition, the area of the second display screen can be set to be small, so that the material cost of the second display screen can be reduced, the product yield is improved, and the cost of the display module and the electronic equipment is reduced. Therefore, according to the display module and the electronic equipment provided by the invention, the cost of the display module and the electronic equipment is relatively low.

Description

Technical Field

[0001] The present application relates to the field of terminal technology, and in particular to a display module and an electronic device. Background Art

[0002] Virtual reality (VR) technology, also known as spiritual technology, is a new practical technology developed in the 20th century. VR technology uses computer simulation to create virtual environments, such as airplane cockpits, molecular structure worlds, high-risk environments, etc., to immerse users in the environment. Among them, the field of view (FoV) and resolution have a great impact on the sense of immersion.

[0003] In the related art, VR equipment may include a display screen and a lens module disposed between the display screen and the human eye. The lens module is used to make the distance between the virtual image of the display screen and the human eye greater than the actual distance between the display screen and the human eye, and can change the range of the image displayed on the display screen in the human eye to improve the immersion of the VR equipment. The display screen may adopt a silicon-based OLED (organic light-emitting diode) display screen, thereby ensuring the high resolution of the display screen, so that the user can obtain clear images at a large field of view.

[0004] However, the cost of the above-mentioned display screen is relatively high, which leads to a higher cost of the VR device. Summary of the invention

[0005] The embodiments of the present application provide a display module and an electronic device, and the cost of the display module and the electronic device is relatively low.

[0006] A first aspect of an embodiment of the present application provides a display module, comprising a first display screen and a second display screen, wherein the directions from the light emitting side to the backlight side of the first display screen and the second display screen are the same, and the second display screen is located on the backlight side of the first display screen; the first display screen comprises a light-transmitting portion and a first display portion, and the projection of the second display screen in the thickness direction of the display module covers the light-transmitting portion; and the pixel density of the first display screen is less than the pixel density of the second display screen.

[0007] The display module provided in the embodiment of the present application may include a first display screen and a second display screen, the direction from the light-emitting side to the backlight side of the first display screen and the second display screen is the same, and the second display screen is located on the backlight side of the first display screen. The first display screen may include a light-transmitting portion and a first display portion, the projection of the second display screen in the thickness direction of the display module covers the light-transmitting portion, and the light emitted by the second display screen may enter the user's eyes through the light-transmitting portion. The pixel density of the first display screen may be less than the pixel density of the second display screen, so that the clarity of the image provided by the second display screen is greater than the clarity of the image provided by the first display screen. The clarity of the first display screen is lower, which may correspond to an area where the user's viewing attention is lower, and the clarity of the second display screen is higher, which may correspond to an area where the user's viewing attention is higher, so that the image provided by the display module conforms to the user's eye habits, so that the user obtains a better viewing experience. Since the display module is formed by splicing the first display screen and the second display screen, the total area of ​​the display module is larger, which can meet the requirements of a large field of view. In addition, the area of ​​the second display screen can be reduced, thereby reducing the material cost of the second display screen and improving the product yield, so as to reduce the cost of the display module and the electronic device. For example, the cost of the second display screen with high pixel density can be greater than the cost of the first display screen with low pixel density, and the area of ​​the second display screen can be set smaller, thereby reducing the material cost of the second display screen, improving the product yield, and reducing the cost of the display module and the electronic device. The total area of ​​the display module is increased by the low-cost first display screen, so that the display module meets the requirements of a large field of view and reduces the overall cost of the display module.

[0008] In a possible implementation, the light-transmitting portion includes a through hole, and the through hole penetrates the first display screen along a thickness direction of the first display screen.

[0009] In this way, no structural layer is arranged in the light-transmitting portion, so that the light transmittance of the light of the second display screen through the light-transmitting portion is higher.

[0010] In a possible embodiment, the first display screen includes a driving backplane, a first light-emitting device layer and a packaging layer which are stacked in sequence. A pixel circuit is arranged in the driving backplane located in the first display part, and a hollow hole is provided in the light-transmitting part. The hollow hole penetrates the first light-emitting device layer along the thickness direction of the first display screen, and part of the packaging layer is inserted in the hollow hole.

[0011] In this way, the light-transmitting portion can effectively transmit light, and abnormal brightness at the joint between the first display screen and the second display screen can be prevented from being noticed by the user.

[0012] In a possible implementation, the second display screen includes a second display portion, and a projection of the second display screen in a thickness direction of the display module covers the light-transmitting portion, including: a projection of the second display portion in a thickness direction of the display module covers the light-transmitting portion.

[0013] In this way, the light emitted from the second display portion can cover the entire light-transmitting portion, thereby preventing the image on the first display screen and the image on the second display screen from being misaligned or spaced apart, so that the images provided by the two can be better combined to provide a complete image for the user.

[0014] In a possible embodiment, the second display portion includes a main display portion and a redundant display portion, the redundant display portion is arranged on at least a portion of the periphery of the main display portion, and the projection of the second display portion in the thickness direction of the display module covers the light-transmitting portion, including: the projection of the main display portion in the thickness direction of the display module coincides with the light-transmitting portion, and the projection of the redundant display portion in the thickness direction of the display module at least partially covers the first display portion.

[0015] In this way, during the alignment process of the first display screen and the second display screen, the main display portion has more selectivity in the second display portion, which can compensate for the alignment tolerance of the first display screen and the second display screen.

[0016] In a possible implementation, the second display screen includes a non-display portion, which is disposed at least partially around a periphery of the second display portion, and a projection of the non-display portion in a thickness direction of the display module at least partially covers the first display portion.

[0017] In this way, the non-display portion can be used to set a portion of wiring to avoid the influence of the portion of wiring on the display of the second display portion.

[0018] In a possible embodiment, the display module also includes an optical device layer, which is located between the first display screen and the second display screen, and the optical device layer includes multiple optical devices, and one optical device corresponds to at least one pixel of the second display screen; the first display screen includes a first light-emitting device layer, and the first light-emitting device layer includes a first light-emitting material layer, and the second display screen includes a second light-emitting device layer, and the second light-emitting device layer includes a second light-emitting material layer; the optical device layer is used to image the surface of the second light-emitting material layer facing the first display screen to an imaging surface, and along the thickness direction of the first display screen, the distance between the imaging surface and the plane where the first light-emitting material layer is located is less than or equal to 0.1 mm.

[0019] In this way, the imaging surface is closer to the plane where the first luminescent material layer is located, so that the user cannot easily observe the joint seam between the first display screen and the second display screen, the images of the first display screen and the second display screen can be better combined, and the picture displayed by the display module is more complete.

[0020] In a possible implementation, the imaging surface is flush with a surface of the first luminescent material layer facing away from the second display screen.

[0021] In this way, the user can be more effectively prevented from observing the joint seam between the first display screen and the second display screen.

[0022] In a possible implementation, the optical device includes a lens, and the thickness of the lens gradually decreases or increases along a direction from an edge to a center of the lens, and a rate of change of the thickness of the lens gradually decreases.

[0023] In this way, the lens can image the second luminescent material layer onto the imaging plane.

[0024] In one possible embodiment, the optical device includes a metasurface device, the metasurface device includes a plurality of phase adjustment members arranged at intervals, the phase adjustment member includes a substrate layer and a plurality of adjustment members, the plurality of adjustment members are arranged at intervals on the substrate layer, and within a unit volume of the phase adjustment member, the volume of the adjustment member and the volume of the phase adjustment member have a ratio; the refractive index of the adjustment member is greater than the refractive index of the substrate layer, and along the direction from the edge to the center of the metasurface device, the ratio of the same phase adjustment member increases, and the increase rate of the ratio of each phase adjustment member decreases; or, the refractive index of the adjustment member is less than the refractive index of the substrate layer, and along the direction from the edge to the center of the metasurface device, the ratio of the same phase adjustment member decreases, and the decrease rate of the ratio of each phase adjustment member decreases.

[0025] In a possible embodiment, the optical device includes a metasurface device, the metasurface device includes a substrate layer and a plurality of adjustment members, and the plurality of adjustment members are arranged at intervals along a preset direction; the metasurface device includes a first end and a second end arranged along the preset direction, and in the direction from the first end to the second end, the adjustment member close to the second end of two adjacent adjustment members has a rotation angle relative to the adjustment member close to the first end, and the rotation directions of the rotation angles of the plurality of adjustment members are the same; in the preset direction, along the direction from the edge to the center of the metasurface device, the rotation angles of the plurality of adjustment members decrease successively, and the rate of decrease of the rotation angle decreases.

[0026] In this way, the metasurface device can image the second light-emitting material layer onto the imaging surface. In addition, the metasurface device has the advantages of easy integration, lightness, thinness and compactness, making it possible to realize a multifunctional and compact display module.

[0027] In one possible embodiment, the optical device includes a plurality of sub-optical devices in a ring shape, and the plurality of sub-optical devices are sequentially arranged from the inside to the outside and connected to each other. Along the direction from the edge to the center of the optical device, the refractive index of the plurality of sub-optical devices increases sequentially, and the increase rate of the refractive index of the plurality of sub-optical devices decreases.

[0028] In this way, the optical device realizes its imaging function through a plurality of sub-optical devices, and can image the second luminescent material layer onto an imaging surface.

[0029] In a possible implementation, the magnification of the optical device is in the range of 0.8-1.2.

[0030] In this way, a high pixel density of the second display screen can be ensured, and a color mixing phenomenon can be avoided on the second display screen.

[0031] In a possible implementation, the display module further includes a light-transmitting layer, and the light-transmitting layer is located at least one of between the optical device layer and the first display screen and between the optical device layer and the second display screen.

[0032] In this way, the light-transmitting layer can reduce stray light and ghost images.

[0033] In a possible implementation, a plurality of conductive lines are disposed in the first display portion, and along an extension direction parallel to the first display screen, each conductive line extends from one end of the first display screen to the other end of the first display screen;

[0034] A portion of the conductive wires includes two extension portions and a bending portion located between the two extension portions, the two extension portions are respectively located on both sides of the light-transmitting portion, at least a portion of the bending portion is located on one side of the light-transmitting portion along a direction perpendicular to one of the two extension portions to the other, the extension portion and the bending portion are arranged in different layers, and are arranged in the same layer as another portion of the conductive wires.

[0035] In this way, the layout of other wirings in the same layer at the inner edge of the first display part can be avoided from being affected. In addition, the difference in parasitic capacitance between the conductive wires at the inner edge of the first display part and the conductive wires in the rest of the part can be reduced, thereby improving the uniformity of display brightness.

[0036] In a possible implementation manner, the pixel density of the first display screen ranges from 400 pixels / inch to 1700 pixels / inch.

[0037] In this way, it is possible to avoid the pixel density of the first display being too low, thereby preventing the clarity of the image provided by the first display from being too low and affecting the user's viewing experience; it is also possible to avoid the pixel density of the first display being too high, thereby preventing the clarity of the image provided by the first display from exceeding the user's requirements for areas of lower attention, thereby reducing the preparation cost of the first display, reducing the cost of use and saving energy.

[0038] In a possible implementation, the pixel density of the second display screen is greater than or equal to 3000 pixels / inch.

[0039] In this way, the image provided by the second display screen has higher definition and more delicate images, so that the image presented in the area with higher user attention meets the user's demand for clarity, allowing the user to obtain a better viewing experience.

[0040] In a possible implementation, a distance between the center of the light-transmissive portion and the center of the first display screen is less than or equal to 0.1 mm.

[0041] In this way, the light-transmitting portion can correspond to the central area of ​​the horizontal field of view angle and the vertical field of view angle, so that the second display screen can provide a higher-definition image for the central area of ​​the horizontal field of view angle and the vertical field of view angle after passing through the light-transmitting portion, thereby meeting the user's demand for clarity in the central area of ​​the field of view angle.

[0042] In a possible implementation manner, the first display portion is disposed on at least a portion of the periphery of the light-transmitting portion.

[0043] A second aspect of an embodiment of the present application provides an electronic device, comprising a lens assembly and the display module of the first aspect, wherein the lens assembly is located on a light emitting side of a first display screen of the display module.

[0044] The electronic device provided in the embodiment of the present application may include a display module, and the display module may include a first display screen and a second display screen. The directions from the light-emitting side to the backlight side of the first display screen and the second display screen are the same, and the second display screen is located on the backlight side of the first display screen. The first display screen may include a light-transmitting portion and a first display portion, and the projection of the second display screen in the thickness direction of the display module covers the light-transmitting portion, and the light emitted by the second display screen may enter the user's eyes through the light-transmitting portion. The pixel density of the first display screen may be less than the pixel density of the second display screen, so that the clarity of the image provided by the second display screen is greater than the clarity of the image provided by the first display screen. The clarity of the first display screen is lower, which may correspond to an area where the user's viewing attention is lower, and the clarity of the second display screen is higher, which may correspond to an area where the user's viewing attention is higher, so that the image provided by the display module conforms to the user's eye habits, so that the user obtains a better viewing experience. Since the display module is formed by splicing the first display screen and the second display screen, the total area of ​​the display module is larger, which can meet the requirements of a large field of view. In addition, the area of ​​the second display screen can be reduced, thereby reducing the material cost of the second display screen and improving the product yield, so as to reduce the cost of the display module and the electronic device. For example, the cost of the second display screen with high pixel density can be greater than the cost of the first display screen with low pixel density, and the area of ​​the second display screen can be set smaller, thereby reducing the material cost of the second display screen, improving the product yield, and reducing the cost of the display module and the electronic device. The total area of ​​the display module is increased by the low-cost first display screen, so that the display module meets the requirements of a large field of view and reduces the overall cost of the display module.

[0045] The construction of the present application as well as its other objects and beneficial effects will be more clearly understood through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A structural diagram of a VR device for viewing with eyes provided in related technology 2;

[0047] Figure 2 A schematic diagram of the structure of the electronic device provided in the embodiment of the present application when in use;

[0048] Figure 3 A schematic diagram of the structure of an eye viewing an electronic device provided in an embodiment of the present application;

[0049] Figure 4 A top view of a display module provided in an embodiment of the present application;

[0050] Figure 5 A top view of a first display screen provided in an embodiment of the present application;

[0051] Figure 6 A top view of a second display screen provided in an embodiment of the present application;

[0052] Figure 7 A cross-sectional view of a second display screen provided in an embodiment of the present application;

[0053] Figure 8 Another cross-sectional view of the second display screen provided in the embodiment of the present application;

[0054] Fig. 9 Another cross-sectional view of the second display screen provided in the embodiment of the present application;

[0055] Fig.10 A cross-sectional view of a display module provided in an embodiment of the present application;

[0056] Fig.11 Another cross-sectional view of the display module provided by the embodiment of the present application;

[0057] Fig.12 A cross-sectional view of a first display screen provided in an embodiment of the present application;

[0058] Fig.13 A perspective view of a source line of a first display screen provided in an embodiment of the present application;

[0059] Fig.14 A perspective view of a gate line of a first display screen provided by an embodiment of the present application;

[0060] Fig.15 A schematic diagram of the structure after the first driving backplane is formed according to an embodiment of the present application;

[0061] Fig.16 A schematic diagram of the structure after forming the first anode layer provided in an embodiment of the present application;

[0062] Fig.17 A schematic diagram of the structure after forming a first hole injection layer and a first hole transport layer provided in an embodiment of the present application;

[0063] Fig.18A schematic diagram of the structure after forming the first light-emitting material layer provided in an embodiment of the present application;

[0064] Fig.19 A schematic diagram of the structure after forming a first electron transport layer, a first electron injection layer and a first cathode layer provided in an embodiment of the present application;

[0065] Fig. 20 A schematic diagram of the structure after the first encapsulation layer is formed according to an embodiment of the present application;

[0066] Fig.21 A top view of a metasurface device provided in an embodiment of the present application;

[0067] Fig. 22 Another top view of the metasurface device provided in an embodiment of the present application;

[0068] Fig.23 Another top view of the metasurface device provided in an embodiment of the present application;

[0069] Fig.24 A schematic diagram of the rotation angle between two adjacent adjustment members arranged along a first preset direction provided in an embodiment of the present application;

[0070] Fig.25 The optical device provided in the embodiment of the present application includes a top view of multiple sub-optical devices.

[0071] Description of reference numerals:

[0072] 11: Silicon-based OLED display; 12: OLED display; 13: Lens module;

[0073] 14: spectroscope; 20: head; 20a / 20b: eyes;

[0074] 30: electronic device; 31: housing; 32: wearable component;

[0075] 33: fixed bracket; 34: top belt assembly; 35: side belt assembly;

[0076] 36: lens assembly; 39: display module; 300: first display screen;

[0077] 301: first non-display portion; 302: first display portion; 303: light-transmitting portion;

[0078] 310: first driving backplane; 311: pixel circuit; 320: first light emitting device layer;

[0079] 321: first anode layer; 322: first light-emitting material layer; 322a: first light-emitting surface;

[0080] 3221: first light emitting unit; 323: first cathode layer; 324: first hole injection layer;

[0081] 325: first hole transport layer; 326: first electron injection layer; 327: first electron transport layer;

[0082] 328: hollow hole; 330: first packaging layer; 340: first cover plate;

[0083] 350a: extension portion; 350b: bending portion; 351: source line;

[0084] 3511: first source line; 3512: second source line; 352: gate line;

[0085] 3521: first gate line; 3522: second gate line; 361: source driving circuit;

[0086] 362: gate driving circuit; 400: second display screen; 401: second non-display portion;

[0087] 402: Second display unit; 4021: Main display unit; 4022: Redundant display unit;

[0088] 410: second driving backplane; 420: second light emitting device layer; 421: second anode layer;

[0089] 422: second light-emitting material layer; 4221: second light-emitting unit; 422a: second light-emitting surface;

[0090] 423: second cathode layer; 430: second encapsulation layer; 440: second cover plate;

[0091] 451: lens layer; 4512: second lens; 452: second planarization layer;

[0092] 453: a third planarization layer; 454: a second color resist layer; 455: a second pixel defining layer;

[0093] 501: light-transmitting layer; 502: optical device layer; 502a: optical device;

[0094] 513: a third lens; 520: a metasurface device; 521: a phase adjustment element;

[0095] 5211: substrate layer; 5212: adjustment member; 5212a: first adjustment member;

[0096] 5212b: second adjusting member; 531: sub-optical device. DETAILED DESCRIPTION

[0097] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0098] In the related art, a VR device may include a display screen and a lens module disposed between the display screen and the eyes. The larger the field of view, the smaller the black edges of the image viewed through the VR device, and thus the stronger the sense of immersion. When the field of view increases, if the clarity cannot keep up, the magnification of a single pixel will increase accordingly, resulting in a decrease in the clarity of the image viewed through the VR device, thereby affecting the user experience. Silicon-based OLED can achieve a high pixel density that ordinary OLEDs cannot achieve, making silicon-based OLEDs have high resolution, which is favored by VR device products.

[0099] However, because silicon-based OLED uses semiconductor technology to prepare the driving backplane, the technical maturity of the driving backplane needs to be improved, and the overall yield is low, resulting in high costs for silicon-based OLED displays and VR devices. In addition, in the application scenario of a large field of view, the silicon-based OLED display needs to have a larger display area, and the larger the product area of ​​the silicon-based OLED display, the higher the material cost and the lower the yield, which will further increase the cost of silicon-based OLED displays and VR devices, thereby restricting the development of silicon-based OLED in the VR field.

[0100] In the first example, in order to take into account the cost and field of view of VR products, the silicon-based OLED display screen can be set to be smaller. For example, the area of ​​the silicon-based OLED display screen is about 1 inch, so that the cost of the silicon-based OLED display screen is relatively low. However, due to the small area of ​​the 1-inch silicon-based OLED display screen, the display screen needs to simultaneously adopt the chief ray angle (CRA) modulation technology to increase the field of view. The CRA modulation technology is to misalign the center of the light-emitting unit of the display screen with the center of the corresponding filter, so that the light of the light-emitting unit is more inclined to be emitted from the filter to increase the light output under a large field of view and reduce the color deviation. However, due to the small size of the light-emitting unit and the filter of the silicon-based OLED display screen, if the center of the filter and the center of the light-emitting unit are misaligned too much, it is easy to cause light crosstalk, so that the CRA modulation has limited improvement on the field of view. In the application scenario of a large field of view, the edge of the image viewed through the VR device will still have problems such as low brightness and color deviation, thereby affecting the user experience. In addition, the cost of a 1-inch silicon-based OLED display screen is still high, and it is difficult to be commercialized on a large scale in the consumer field.

[0101] For related example 2, see Figure 1, VR products can use two display screens, which can include a silicon-based OLED display screen 11 and an OLED display screen 12 respectively. The lens module 13 is located on the light-emitting side of the OLED display screen 12. An inclined spectroscope 14 is arranged between the OLED display screen 12 and the lens module 13. The light emitted by the OLED display screen 12 passes through the spectroscope 14 and reaches the lens module 13 before entering the eye 20a. The silicon-based OLED display screen 11 is arranged at intervals at the top of the spectroscope 14. The silicon-based OLED display screen 11 and the OLED display screen 12 are perpendicular to each other. The light emitted by the silicon-based OLED display screen 11 reaches the spectroscope 14 and is reflected by the spectroscope 14 to the lens module 13, and then reaches the eye 20a. The silicon-based OLED display screen 11 can be used to provide a field of view in the central area to ensure that the clarity of the field of view in the central area meets the needs of users. In addition, the area of ​​the silicon-based OLED display screen 11 can be set smaller to reduce the cost of the silicon-based OLED display screen 11 and the VR device. The OLED display screen 12 can be used to provide a field of view in the peripheral area. The OLED display screen 12 can increase the total area of ​​the display screen of the VR device, thereby meeting the needs of a large field of view. In addition, since the cost of the OLED display screen 12 is reduced, the cost of the VR device can be reduced. However, since the silicon-based OLED display screen 11 and the OLED display screen 12 are perpendicular to each other, the overall volume occupied by the silicon-based OLED display screen 11 and the OLED display screen 12 is large, which makes the volume and weight of the VR device large. In addition, the silicon-based OLED display screen 11 and the OLED display screen 12 need to be set with different fixing structures, and an additional beam splitter 14 needs to be set, which further makes the volume and weight of the VR device large, which is not conducive to the thinness of the VR device and reduces the user experience.

[0102] Based on the above problems, the embodiment of the present application provides a display module and an electronic device, wherein the display module may include a first display screen and a second display screen, wherein the directions from the light-emitting side to the backlight side of the first display screen and the second display screen are the same, and the second display screen is located on the backlight side of the first display screen. The first display screen may include a light-transmitting portion and a first display portion, wherein the projection of the second display screen in the thickness direction of the display module covers the light-transmitting portion, and the light emitted by the second display screen may enter the user's eyes through the light-transmitting portion. The pixel density of the first display screen may be less than the pixel density of the second display screen, so that the clarity of the image provided by the second display screen is greater than the clarity of the image provided by the first display screen. The clarity of the first display screen is lower, which may correspond to an area where the user has a lower viewing attention, and the clarity of the second display screen is higher, which may correspond to an area where the user has a higher viewing attention, so that the image provided by the display module conforms to the user's eye habits, so that the user obtains a better viewing experience. Since the display module is formed by splicing the first display screen and the second display screen, the total area of ​​the display module is larger, which can meet the requirements of a large field of view. In addition, the area of ​​the second display screen may be reduced, thereby reducing the material cost of the second display screen and improving the product yield, so as to reduce the cost of the display module and the electronic device. For example, the cost of the second display screen with high pixel density can be greater than the cost of the first display screen with low pixel density, and the area of ​​the second display screen can be set smaller, thereby reducing the material cost of the second display screen, improving the product yield, and reducing the cost of the display module and the electronic device. The total area of ​​the display module is increased by the low-cost first display screen, so that the display module meets the requirements of a large field of view and reduces the overall cost of the display module.

[0103] Compared with the related art 1, since the total area of ​​the display module is larger, the problem of low brightness and color deviation at the edge of the image caused by the small area of ​​the display module can be avoided, so that the brightness / chromaticity of the image provided by the display module and the electronic device is more uniform as a whole, thereby improving the user's viewing experience. In addition, since the second display screen can be set smaller, the cost of the second display screen, the display module and the electronic device can be effectively reduced, and the application scale of the second display screen in the consumer field can be expanded.

[0104] Compared with the related art 2, since the first display screen and the second display screen are stacked and have an overlapping portion, the overall volume occupied by the first display screen and the second display screen is smaller, which is conducive to the thinness of the display module and the electronic device. In addition, it is convenient to fix the first display screen and the second display screen with the same fixing structure, and there is no need to set up an additional beam splitter, so that the volume and weight of the electronic device can be further reduced, which is conducive to the thinness of VR equipment and improves the user experience.

[0105] The following is combined with Figure 1-24 The electronic device 30 provided in the embodiment of the present application is described.

[0106] The electronic device 30 provided in the embodiment of the present application may include but is not limited to a head-mounted electronic device, a mobile phone, a tablet computer, a laptop computer, an ultra-mobile personal computer (UMPC), a handheld computer, a walkie-talkie, a netbook, a vehicle-mounted device, a security device, etc.

[0107] The embodiment of the present application is described by taking the electronic device 30 as a head-mounted electronic device as an example.

[0108] Head-mounted electronic devices can achieve different effects such as virtual reality (VR), augmented reality (AR), mixed reality (MR), etc. Head-mounted electronic devices may include but are not limited to glasses, eye masks, face masks or helmets.

[0109] For example, see Figure 2 The head-mounted electronic device may include a cover 31 and a wearable component 32, and an accommodating space for accommodating the user's head 20 is formed between the cover 31 and the wearable component 32. The wearable component 32 may include at least one of a fixed bracket 33, a top strap component 34, and a side strap component 35. For example, the length of the top strap component 34 and / or the side strap component 35 can be adjusted, so that the use requirements of users with different head circumferences can be met by adjusting the length of the top strap component 34 and / or the side strap component 35. The wearable component 32 can also be a head bracket or other forms. When the user wears it, the cover 31 can be located in front of the user's eyes 20b, and the fixed bracket 33 can be located at the back of the user's head.

[0110] See also Figure 3 The head-mounted electronic device may include a display module 39 and a lens assembly 36. The display module 39 may be installed in the cover 31 to protect the display module 39. The lens assembly 36 may be located on the light-emitting side of the display module 39, and the display module 39 may be located on the side of the lens assembly 36 away from the eye 20b. The lens assembly 36 may magnify the image displayed by the display module 39 and project it into the eye 20b. What the eye 20b sees is the magnified virtual image of the display module 39, so that the field of view can be improved through the lens assembly 36, creating a virtual sense of immersion for the user. The lens assembly 36 may be exposed to the outside of the cover 31, so that the user can view the virtual image through the lens assembly 36.

[0111] Exemplarily, the lens assembly 36 may be composed of at least one lens (first lens), and the first lens may include but is not limited to a Fresnel lens, a plano-convex lens, a biconvex lens, a positive meniscus lens, a plano-concave lens, a biconcave lens, a negative meniscus lens, etc. The light emitted by the display module 39 enters the eye 20b after being refracted or reflected by one or more first lenses.

[0112] It is understood that after the light emitted by the object is refracted or reflected by the lens, the light path changes, and the image seen by the eyes is a virtual image. The position of the virtual image is called the position of the virtual image, and the plane where the virtual image is located is called the imaging plane. The distance between the position of the virtual image and the lens is the image distance, and the distance between the object and the lens is the object distance. It should be understood that there is no actual object at the position of the virtual image.

[0113] Exemplarily, at least one of a processor, a motion sensor, a memory, a battery, a microphone, a speaker, an audio module, a communication module, a camera, etc. (not shown in the figure) may be installed on the cover 31. For example, the motion sensor may be an inertial measurement unit for detecting the direction of movement of the user's head 20, and converting the sensed information into an electrical signal or other required form and outputting it to the processor. The processor may be used to obtain the direction of movement of the user's head 20 detected by the motion sensor, and generate image data for transmission to the display module 39. The memory is used to store instructions and data, and the memory may be an independent structure and electrically connected to the processor, or the memory may be integrated with the processor.

[0114] It is understandable that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the electronic device 30. In some embodiments of the present application, the electronic device 30 may include more or fewer components than shown, or combine some components, or separate some components, or arrange the components differently.

[0115] The display module 39 provided in the embodiment of the present application is described below.

[0116] See also Figure 3 and Figure 4 The display module 39 may include a first display screen 300 and a second display screen 400. The direction from the light emitting side to the backlight side of the first display screen 300 is the same as the direction from the light emitting side to the backlight side of the second display screen 400. The light emitting directions of the first display screen 300 and the second display screen 400 may be the same. In this case, the first display screen 300 and the second display screen 400 are stacked.

[0117] The display screen (the first display screen 300 and / or the second display screen 400) may include a light-emitting side and a backlight side, and the light-emitting side and the backlight side may be arranged opposite to each other along the thickness direction of the display screen. The light-emitting side may be a side for displaying images, and the backlight side may be the other side arranged opposite to the light-emitting side along the thickness direction of the display screen. The second display screen 400 may be located on the backlight side of the first display screen 300, and the light-emitting side of the first display screen 300 is also the light-emitting side of the display module 39.

[0118] For example, see Figure 3 , the first display screen 300 may include a light-transmitting portion 303 and a first display portion 302, and the light-transmitting portion 303 and the first display portion 302 may be arranged adjacent to each other. The light-transmitting portion 303 may allow light to pass through. The projection of the second display screen 400 in the thickness direction of the display module 39 may cover the light-transmitting portion 303, and the light emitted by the second display screen 400 may enter the user's eye 20b through the light-transmitting portion 303. Since the display module 39 is formed by splicing the first display screen 300 and the second display screen 400 together, the total display area of ​​the display module 39 is large, thereby meeting the requirements of a large field of view. In addition, the area of ​​the second display screen 400 may be reduced, thereby reducing the material cost of the second display screen 400 and improving the product yield, so as to reduce the cost of the display module 39 and the electronic device 30.

[0119] It is understandable that the larger the display area of ​​the display module 39, the larger the field of view that can be provided. On the contrary, the smaller the display area of ​​the display module 39, the smaller the field of view that can be provided. A large field of view means that the image seen by the user is large, and the resolution requirement is high. On the contrary, a small field of view means that the image seen by the user is small, and the resolution requirement is low. Pixel density can be used to indicate the resolution of a display screen. Pixel density refers to the number of pixels per inch of a display screen. The higher the pixel density, the higher the density of the displayed image, and the richer and clearer the details of the picture.

[0120] The pixel density (pixels per inch, PPI for short) of the first display screen 300 may be smaller than that of the second display screen 400, so that the definition of the image provided by the second display screen 400 is greater than that of the image provided by the first display screen 300. The first display screen 300 has a lower definition, which may correspond to an area where the user's viewing attention is lower, and the second display screen 400 has a higher definition, which may correspond to an area where the user's viewing attention is higher, so that the image provided by the display module 39 conforms to the user's eye habits, so that the user can obtain a better viewing experience.

[0121] The preparation cost of the second display screen 400 with a high pixel density can be greater than the preparation cost of the first display screen 300 with a low pixel density. Since the second display screen 400 only corresponds to the area with high user attention, the area of ​​the second display screen 400 can be set to be smaller, so that the material cost of the second display screen 400 can be reduced, the product yield can be improved, and the cost of the display module 39 and the electronic device 30 can be reduced. And the total area of ​​the display module 39 is increased by the low-cost first display screen 300, so that the display module 39 meets the demand for a large field of view and reduces the overall cost of the display module 39. For example, the area of ​​the first display screen 300 can be set to be larger, so as to better meet the user's demand for a large field of view and reduce the cost of the display module 39. In addition, since the pixel density of the first display screen 300 is low, the power consumption of the first display screen 300 can be reduced, thereby saving energy and reducing the cost of use.

[0122] Therefore, the embodiment of the present application splices the first display screen 300 and the second display screen 400 together, which can meet the user's demand for image clarity in areas of high concern and a wide viewing angle, and can also reduce the cost of the display module 39 and the electronic device 30.

[0123] Compared with the related art 1, since the total area of ​​the display module 39 is larger, the problem of low brightness and color deviation at the edge of the image caused by the small area of ​​the display module 39 can be avoided, so that the brightness / chromaticity of the image provided by the display module 39 and the electronic device 30 is more uniform as a whole, improving the user's viewing experience. In addition, since the second display screen 400 can be set smaller, the cost of the second display screen 400, the display module 39 and the electronic device 30 can be effectively reduced, and the application scale of the second display screen 400 in the consumer field can be expanded.

[0124] Compared with the related art 2, since the first display screen 300 and the second display screen 400 are stacked, the overall volume occupied by the first display screen 300 and the second display screen 400 is smaller, which is conducive to the thinness of the display module 39 and the electronic device 30. In addition, it is convenient to fix the first display screen 300 and the second display screen 400 with the same fixing structure, and there is no need to set up an additional beam splitter, so that the volume and weight of the electronic device 30 can be further reduced, which is conducive to the thinness of the electronic device 30 and improves the user experience.

[0125] For example, the pixel density of the first display screen 300 may be in the range of 400 pixels / inch to 1700 pixels / inch, thereby preventing the pixel density of the first display screen 300 from being too low, preventing the clarity of the image provided by the first display screen 300 from being too low and affecting the viewing experience of the user, and preventing the pixel density of the first display screen 300 from being too high, preventing the clarity of the image provided by the first display screen 300 from exceeding the user's requirements for the area with low attention, thereby reducing the preparation cost of the first display screen 300, and also reducing the use cost and saving energy. For example, the pixel density of the first display screen 300 may be 400 pixels / inch, 600 pixels / inch, 800 pixels / inch, 1000 pixels / inch, 1200 pixels / inch, 1400 pixels / inch, 1700 pixels / inch, or any value between 400 pixels / inch and 1700 pixels / inch.

[0126] Exemplarily, the pixel density of the second display screen 400 may be greater than or equal to 3000 pixels / inch, so that the image provided by the second display screen 400 has a higher definition and provides a more delicate image, so that the image presented in the area where the user pays more attention meets the user's demand for clarity, so that the user obtains a better viewing experience. For example, the pixel density of the second display screen 400 may be 3000 pixels / inch, 3200 pixels / inch, 3400 pixels / inch, 3600 pixels / inch, or any value greater than 3000 pixels / inch.

[0127] Exemplarily, the first display screen 300 may include but is not limited to a liquid crystal display (LCD) display screen, an OLED display screen, a light emitting diode (LED) display screen, a quantum dot light emitting diodes (QLED) display screen, or a mini light emitting diode (Mini light emitting diodes, MiniLED) display screen.

[0128] Exemplarily, the second display screen 400 may include, but is not limited to, a micro light emitting diode (Micro LED) display screen, a micro organic light emitting diode (Micro OLED, also known as silicon-based OLED) display screen, a fast liquid crystal (fast LCD) display screen, a liquid crystal on silicon (LCOS) display screen, a digital light processing (DLP) display screen, or a laser scanning micro electromechanical system (laser MEMS) display screen. For example, the second display screen 400 may be a silicon-based OLED display screen, which has the characteristics of ultra-high PPI, can be compatible with a small, thin and light form factor and high resolution, and has the advantages of high color gamut, high brightness, etc.

[0129] See also Figure 3 and Figure 4 , the first display screen 300 may include a first direction X, a second direction Y and a third direction Z, and the first direction X, the second direction Y and the third direction Z are all different. The first direction X and the second direction Y may be any two different directions parallel to the first display screen 300, and the third direction Z may be any direction intersecting the first display screen 300. For example, the first direction X, the second direction Y and the third direction Z may be perpendicular to each other. Exemplarily, the first direction X may be the length direction of the first display screen 300, the second direction Y may be the width direction of the first display screen 300, and the third direction Z may be the thickness direction of the first display screen 300. The thickness direction of the first display screen 300 may be the same as the thickness direction of the display module 39. The length, width and thickness in the embodiments of the present application are merely for the convenience of description and do not imply any limitation on the size. For example, the width may be greater than, equal to or less than the length.

[0130] The positional relationship between the light-transmitting portion 303 and the first display portion 302 of the first display screen 300 provided in the embodiment of the present application is described below.

[0131] Since the light emitted by the second display screen 400 enters the user's eye 20b through the light-transmitting portion 303, it is equivalent to that the light emitted from the second display screen 400 through the light-transmitting portion 303 and the light emitted from the first display portion 302 together form the light emitted by the display module 39, and are used together to form an image. The area corresponding to the light-transmitting portion 303 is the area where the user pays more attention to the viewing, and the area corresponding to the first display portion 302 is the area where the user pays less attention to the viewing.

[0132] See also Figure 5, the first display portion 302 may be disposed on at least a portion of the periphery of the light-transmitting portion 303, the first display portion 302 may be located on at least one side of the first direction X of the light-transmitting portion 303, and / or, the first display portion 302 may be located on at least one side of the second direction Y of the light-transmitting portion 303. Exemplarily, the field of view may include a horizontal field of view angle and a vertical field of view angle. One of the first direction X and the second direction Y may correspond to a horizontal field of view angle, and the other corresponds to a vertical field of view angle. The embodiment of the present application is described by taking the first direction X corresponding to the horizontal field of view angle and the second direction Y corresponding to the vertical field of view angle as an example.

[0133] It is understandable that in a scene with a large field of view, when the eye 20b is viewing the central area of ​​the image (within the range of a small field of view), the muscles of the eye 20b are in a relatively natural state, and the eye 20b can distinguish objects more easily and clearly. In this field of view, the eye 20b is more sensitive to changes in various information. Therefore, the eye 20b pays more attention to this area, concentrates its attention, and requires higher clarity. When the eye 20b is viewing the peripheral area of ​​the image (within the range of a large field of view), it needs to move the eyeball or even turn its head to look, and it will feel tired after a period of time. Therefore, the eye 20b pays less attention to the peripheral area of ​​the image, its attention is scattered, and requires lower clarity.

[0134] Exemplarily, the first display portion 302 may be located on both sides of the light-transmitting portion 303 in the first direction X. For example, along the first direction X, the light-transmitting portion 303 may be disposed close to the middle of the first display screen 300 in the first direction X, so that the light-transmitting portion 303 corresponds to the central area of ​​the horizontal field of view, and the first display portion 302 corresponds to the peripheral area of ​​the horizontal field of view, so that the second display screen 400 can provide a high-definition image for the central area of ​​the horizontal field of view after passing through the light-transmitting portion 303, and the first display portion 302 provides a low-definition image for the peripheral area of ​​the horizontal field of view, thereby matching the viewing habits of the eye 20b along the horizontal field of view under the premise of meeting a large field of view and low cost.

[0135] Exemplarily, the first display unit 302 may be located on both sides of the second direction Y of the light-transmitting unit 303. For example, along the second direction Y, the light-transmitting unit 303 may be disposed close to the middle of the second direction Y of the first display screen 300, so that the light-transmitting unit 303 corresponds to the central area of ​​the vertical field of view, and the first display unit 302 corresponds to the peripheral area of ​​the vertical field of view, so that the second display screen 400 can provide a high-definition image for the central area of ​​the vertical field of view after passing through the light-transmitting unit 303, and the first display unit 302 provides a low-definition image for the peripheral area of ​​the vertical field of view, thereby matching the viewing habits of the eye 20b along the vertical field of view under the premise of meeting a large field of view and low cost.

[0136] Exemplarily, the first display unit 302 may be disposed on the entire periphery of the light-transmitting unit 303. For example, the light-transmitting unit 303 may be disposed close to the center of the first display screen 300, and the distance between the center of the light-transmitting unit 303 and the center of the first display screen 300 may be less than or equal to 0.1 mm, so that the light-transmitting unit 303 may correspond to the central area of ​​the horizontal field of view angle and the vertical field of view angle, and the first display unit 302 may correspond to the peripheral area of ​​the horizontal field of view angle and the vertical field of view angle, so that the second display screen 400 may provide a high-definition image for the central area of ​​the horizontal field of view angle and the vertical field of view angle after passing through the light-transmitting unit 303, and the first display unit 302 may provide a low-definition image for the peripheral area of ​​the horizontal field of view angle and the vertical field of view angle, thereby matching the viewing habits of the eye 20b along the horizontal field of view angle and the vertical field of view angle under the premise of meeting the large field of view angle and low cost. For example, the distance between the center of the light-transmitting portion 303 and the center of the first display screen 300 can be 0 mm, 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, or any value less than 0.1 mm. When the distance is 0 mm, the center of the light-transmitting portion 303 coincides with the center of the first display screen 300, which can better match the viewing habits of the eye 20b along the horizontal and vertical viewing angles.

[0137] The positional relationship between the first display screen 300 and the second display screen 400 provided in the embodiment of the present application is described below.

[0138] In some embodiments, see Figure 5 , the first display screen 300 may include a first non-display portion 301, and the first non-display portion 301 may be disposed at least partially around the first display portion 302. Figure 6 The second display screen 400 may include a non-display portion (the non-display portion may be a second non-display portion 401 ), and the second non-display portion 401 may be disposed on at least a portion of the periphery of the second display portion 402 .

[0139] Exemplarily, the projection of the second non-display portion 401 in the thickness direction of the display module 39 may at least partially cover the first display portion 302. For example, the projection of the second non-display portion 401 in the thickness direction of the display module 39 may be located in the first display portion 302, so that the second non-display portion 401 may be blocked by the first display portion 302 to prevent the second non-display portion 401 from being noticed by the user and affecting the display effect of the display module 39.

[0140] See also Figure 3 and Figure 4, along the thickness direction of the first display screen 300, the light-transmitting portion 303 of the first display screen 300 and the second display screen 400 can be arranged opposite to each other. The light emitted by the first display section 302 forms a first image, and the second display screen 400 may include a second display section 402, and the light emitted by the second display section 402 forms a second image, and the second image and the first image passing through the light-transmitting portion 303 together form a graphic presented by the display module 39. The projection of the second display section 402 in the thickness direction of the display module 39 can cover the light-transmitting portion 303, so that the light emitted by the second display section 402 can cover the light-transmitting portion 303, thereby preventing the first image and the second image from being misaligned or having a gap, so that the first image and the second image can be better combined to provide a complete image for the user.

[0141] For example, see Figure 4 and Figure 6 The second display portion 402 may include a main display portion 4021 and a redundant display portion 4022. The redundant display portion 4022 may be disposed at least partially around the main display portion 4021. The projection of the main display portion 4021 in the thickness direction of the display module 39 may overlap with the light-transmitting portion 303. The projection of the redundant display portion 4022 in the thickness direction of the display module 39 may at least partially cover the first display portion 302. For example, the projection of the redundant display portion 4022 in the thickness direction of the display module 39 may be located in the first display portion 302. Both the redundant display portion 4022 and the main display portion 4021 may display images. By disposing the redundant display portion 4022, the area of ​​the second display portion 402 is made larger than the area of ​​the light-transmitting portion 303, so that the projection of the second display portion 402 in the thickness direction of the display module 39 covering the light-transmitting portion 303 can be realized more easily. During the alignment process of the first display screen 300 and the second display screen 400, the main display part 4021 has more selectivity in the second display part 402, which can compensate for the alignment tolerance of the first display screen 300 and the second display screen 400. For example, see Figure 7-Figure 9 The redundant display portion 4022 may be located on at least one side of the main display portion 4021 along the first direction X, and / or the redundant display portion 4022 may be located on at least one side of the main display portion 4021 along the second direction Y. Figure 6 The redundant display unit 4022 can be arranged on the entire periphery of the main display unit 4021, so as to compensate for the splicing alignment tolerance of the first display screen 300 and the second display screen 400 in various directions, and effectively ensure the alignment accuracy of the first display screen 300 and the second display screen 400.

[0142] The stacked structure layers of the first display screen 300 provided in the embodiment of the present application are described below.

[0143] See also Fig.10 and Fig.12The first display screen 300 may include a driving backplane (the driving backplane may be a first driving backplane 310) and a first light-emitting device layer 320. The first driving backplane 310 and the first light-emitting device layer 320 may be stacked. The first driving backplane 310 may be provided with a pixel circuit 311, which may be used to be electrically connected to the first light-emitting device layer 320 to control the first light-emitting device layer 320 to emit light. The pixel circuit 311 may include a thin film transistor and a capacitor structure, etc.

[0144] For example, see Fig.13 and Fig.14 , the first driving backplane 310 may also be provided with conductive wires (e.g., source lines 351 and / or gate lines 352), and the conductive wires may be electrically connected to the pixel circuit 311. Along the extension direction parallel to the first display screen 300, the conductive wires extend from one end of the first display screen 300 to the other end of the first display screen 300. The conductive wires may be located in the first display portion 302, while no conductive wires are provided in the light-transmitting portion 303, thereby avoiding the influence of the conductive wires on the transmittance of the light-transmitting portion 303.

[0145] In some embodiments, there may be multiple conductive lines, and the multiple conductive lines may include multiple first conductive lines, and the first conductive lines extend from one end to the other end of the first display screen 300 along the first direction X. The embodiment of the present application is described by taking the first conductive line as a source line as an example. Fig.13 , the source line 351 can be electrically connected to the source driving circuit 361. The source line 351 can include a first source line 3511, and the first source line 3511 can be electrically connected to the pixel circuit 311 in the first display part 302 located on opposite sides of the light-transmitting part 303 along the first direction X. The first source line 3511 can include a bending portion 350b and two extension portions 350a, the bending portion 350b is located between the two extension portions 350a, and the two extension portions 350a are respectively located on both sides of the light-transmitting part 303 along the first direction X, and at least part of the bending portion 350b can be located on one side of the light-transmitting part 303 along the second direction Y. Since in the prior art, each conductive line is a straight line, and one conductive line is electrically connected to a row (or a column) of pixel circuits 311 arranged along the first direction X, part of the conductive line will be distributed in the light-transmitting part 303, thereby affecting the transmittance of the light-transmitting part 303. In the embodiment of the present application, the bending portion 350b is provided to prevent the first source line 3511 from passing through the light-transmitting portion 303, so as to avoid the influence of the first source line 3511 on the transmittance of the light-transmitting portion 303. The source line 351 may further include a second source line 3512, which is located at one side of the light-transmitting portion 303 along the second direction Y.

[0146] In some examples, the first source line 3511 and the second source line 3512 can be arranged in the same layer, so as to facilitate the simultaneous preparation of the first source line 3511 and the second source line 3512. The inner edge of the first display portion 302 includes two first inner edges, and the two first inner edges can be arranged at intervals along the second direction Y, and the first inner edge can be located between the second source line 3512 and the light-transmitting portion 303. The bent portions 350b of the plurality of first source lines 3511 will be concentrated in the first inner edge of the first display portion 302, so that the routing density of the first inner edge is higher than that of the rest of the first display portion 302. In the first inner edge, the bent portions 350b are not easy to avoid other routings of the layer, and are easy to affect the layout of other routings of the layer, which may affect the pixel arrangement and brightness corresponding to the first inner edge, and present a black border. In addition, since the wiring density in the first inner edge is significantly different from that in the rest of the first display portion 302, it is easy to cause a significant difference in parasitic capacitance between the source line 351 in the first inner edge and the source line 351 in the rest of the first display portion 302, thereby affecting the uniformity of display brightness.

[0147] In some examples, the extension 350a of the first source line 3511 and the second source line 3512 can be arranged in the same layer, so as to facilitate the simultaneous preparation of the extension 350a of the first source line 3511 and the second source line 3512. The bending portion 350b of the first source line 3511 and the extension 350a of the first source line 3511 and the second source line 3512 can be arranged in different layers, which can avoid the wiring density of the first inner edge being too large, so that the design freedom of the wiring of this layer in the first inner edge is higher, and the bending portion 350b of the first source line 3511 is avoided. The layout of other wirings in the first inner edge is affected, and the pixel arrangement and brightness in the first inner edge are avoided. In addition, the multiple source lines 351 can be distributed more evenly in the first display part 302, reducing the difference in parasitic capacitance between the source lines 351 in the first inner edge and the source lines 351 in the rest of the parts, and improving the uniformity of display brightness.

[0148] In some embodiments, the plurality of conductive lines may include a plurality of second conductive lines, and each second conductive line may extend from one end to the other end of the first display screen 300 along the second direction Y. The present application embodiment is described by taking the second conductive line as a gate line as an example. Fig.14, the gate line 352 can be electrically connected to the gate driving circuit 362. The gate line 352 can include a first gate line 3521, and the first gate line 3521 can be electrically connected to the pixel circuit 311 in the first display part 302 located on opposite sides of the light-transmitting part 303 along the second direction Y. The first gate line 3521 can include a bent portion 350b and two extensions 350a, and the bent portion 350b can be located between the two extensions 350a, and the two extensions 350a are respectively located on both sides of the light-transmitting part 303 along the second direction Y. At least part of the bent portion 350b can be located on one side of the light-transmitting part 303 along the first direction X to avoid the influence of the bent portion 350b of the first gate line 3521 on the transmittance of the light-transmitting part 303. The gate line 352 can also include a second gate line 3522, and the second gate line 3522 can be located on one side of the light-transmitting part 303 along the first direction X.

[0149] In some examples, the first gate line 3521 and the second gate line 3522 may be disposed in the same layer, so as to facilitate simultaneous preparation of the first gate line 3521 and the second gate line 3522. The principle is similar to that of the source line 351 and will not be described in detail.

[0150] In some examples, the inner edge of the first display portion 302 includes two second inner edges, the two second inner edges can be arranged at intervals along the first direction X, and the second inner edge can be located between the second gate line 3522 and the light-transmitting portion 303. The extension 350a of the first gate line 3521 can be arranged in the same layer as the second gate line 3522, so as to facilitate the simultaneous preparation of the extension 350a of the first gate line 3521 and the second gate line 3522. The bending portion 350b of the first gate line 3521 and the extension 350a of the first gate line 3521 and the second gate line 3522 can all be arranged in different layers. It can avoid that the routing density of the second inner edge is too large, and the bending portion 350b of the first gate line 3521 can avoid affecting the layout of other routings in the first inner edge, thereby avoiding affecting the pixel arrangement and brightness in the second inner edge. In addition, the gate lines 352 can be distributed more evenly in the first display portion 302, reducing the difference in parasitic capacitance between the gate lines 352 in the second inner edge and the gate lines 352 in the remaining portion, thereby improving the uniformity of display brightness. The principle is similar to that of the source line 351 and will not be described in detail.

[0151] The bent portion 350b of the first source line 3511 and / or the bent portion 350b of the first gate line 3521 may be arranged in the same layer as the original wiring of other layers in the first driving backplane 310, thereby facilitating the reduction of the thickness of the first display screen 300. Alternatively, a new wiring layer may be added to the first driving backplane 310 to separately arrange the bent portion 350b of the first source line 3511 and / or the bent portion 350b of the first gate line 3521, thereby avoiding the influence on the layout of the original wiring of other layers.

[0152] Exemplarily, the source driver circuit 361 and the gate driver circuit 362 may be located on different sides of the first display screen 300. Alternatively, the source driver circuit 361 and the gate driver circuit 362 may be located on the same side of the first display screen 300, for example, the source driver circuit 361 and the gate driver circuit 362 may be integrated into the same driver chip.

[0153] See also Fig.12 The first light-emitting device layer 320 may include a first anode layer 321, a first light-emitting material layer 322 and a first cathode layer 323. The first light-emitting material layer 322 may be located between the first anode layer 321 and the first cathode layer 323. The first anode layer 321 may be located on the side of the first light-emitting material layer 322 facing the first driving backplane 310.

[0154] Exemplarily, the first light-emitting material layer 322 may include a plurality of first light-emitting units 3221, and the first light-emitting units 3221 may include a red light-emitting unit, a green light-emitting unit, a blue light-emitting unit, or a white light-emitting unit. The first display screen 300 may include a plurality of pixels, and the plurality of pixels of the first display screen 300 may be arranged in an array. Each pixel of the first display screen 300 may include a plurality of first light-emitting units 3221. For example, each pixel of the first display screen 300 may include three first light-emitting units 3221, and the three first light-emitting units 3221 may be a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit, respectively.

[0155] Exemplarily, a first color resist layer may be provided on the side of the first light emitting device layer 320 away from the first driving backplane 310, the first color resist layer may include a plurality of first color resists, and the first light emitting unit 3221 may correspond to a first color resist. For example, the color of the first color resist may be the same as the color of the corresponding first light emitting unit 3221.

[0156] Illustratively, a first pixel defining layer may be disposed between two adjacent first light emitting units 3221 , and the first pixel defining layer may be disposed around the periphery of each first light emitting unit 3221 .

[0157] For example, at least one of a first hole transport layer 325, a first hole injection layer 324, and an electron blocking layer may be disposed between the first anode layer 321 and the first light emitting material layer 322. At least one of a first electron transport layer 327, a first electron injection layer 326, and a hole blocking layer may be disposed between the first cathode layer 323 and the first light emitting material layer 322.

[0158] Exemplarily, a first planarization layer may be disposed between the first driving backplane 310 and the first light-emitting device layer 320 , and the first planarization layer may provide good planar support for the first light-emitting device layer 320 to be formed subsequently.

[0159] Exemplarily, the first display screen 300 may include an encapsulation layer (the encapsulation layer may be a first encapsulation layer 330), the first encapsulation layer 330 may be located on the side of the first light-emitting device layer 320 away from the first driving backplane 310, and the first encapsulation layer 330 may be used to seal the first light-emitting device layer 320 to prevent external water and oxygen from penetrating into the first light-emitting device layer 320 and damaging the first display screen 300. For example, the first encapsulation layer 330 may include a silicon oxide (SiO) layer and / or a silicon nitride (SiN) layer, or other inorganic structure layers and / or organic structure layers. The thickness of the first encapsulation layer 330 in the first display portion 302 may be approximately equal to 1 μm.

[0160] Exemplarily, the first display screen 300 may include a first cover plate 340 . The first cover plate 340 may be located on a side of the first encapsulation layer 330 away from the first driving backplane 310 . The first cover plate 340 may be used to protect the first display screen 300 to avoid scratching the first display screen 300 .

[0161] Exemplarily, a first adhesive layer may be provided on the side of the first cover plate 340 facing the first encapsulation layer 330, and the first adhesive layer may be used to connect the first cover plate 340. In an embodiment in which a first color resist layer is provided in the first display screen 300, the first color resist layer may be located between the first encapsulation layer 330 and the first adhesive layer.

[0162] The light-transmitting portion 303 provided in the embodiment of the present application is described below.

[0163] In some embodiments, the light-transmitting portion 303 may include a through hole, and the through hole penetrates the first display screen 300 along the thickness direction of the first display screen 300. In other words, the light-transmitting portion 303 is formed by the through hole, and no structural layer is disposed in the light-transmitting portion 303, so that the light transmittance of the light of the second display screen 400 is higher in the light-transmitting portion 303.

[0164] In some embodiments, see Fig.12, a light-transmitting structural layer may be prepared in the light-transmitting portion 303 to avoid the shielding of the light of the second display screen 400 by preparing an opaque structural layer. Exemplarily, at least part of the first driving backplane 310 may be provided in both the first display portion 302 and the light-transmitting portion 303, and the pixel circuit 311 may be provided in the first driving backplane 310 located in the first display portion 302, while the pixel circuit 311 is not provided in the first driving backplane 310 in the light-transmitting portion 303, thereby avoiding the influence of the pixel circuit 311 on the transmittance of the light-transmitting portion 303. The light-transmitting portion 303 may include a hollow hole 328, wherein the hollow hole 328 may penetrate the first light-emitting device layer 320 along the thickness direction of the first display screen 300, that is, the first light-emitting device layer 320 is not provided in the light-transmitting portion 303, thereby avoiding the influence of the first light-emitting device layer 320 on the transmittance of the light-transmitting portion 303. At least part of the first encapsulation layer 330 and the first cover plate 340 may be disposed in the first display portion 302 and the light-transmitting portion 303, wherein part of the first encapsulation layer 330 may be inserted into the hollow hole 328, thereby filling the hollow hole 328 to improve the structural strength of the light-transmitting portion 303. Compared with forming the light-transmitting portion 303 with a through hole, preparing a light-transmitting structural layer in the light-transmitting portion 303 can avoid total reflection at the hole wall of the through hole to cause stray light, thereby preventing the abnormal brightness of the first display screen 300 and the second display screen 400 from being noticed by the user at the joint. In other examples, the first driving backplane 310 may not be prepared in the light-transmitting portion 303. For example, the light-transmitting portion 303 may not be prepared with the first light-emitting device layer 320 and the first driving backplane 310 at the same time, the hollow hole 328 may penetrate the first light-emitting device layer 320 and the first driving backplane 310 along the thickness direction of the display module 39, and the first encapsulation layer 330 may be inserted into the hollow hole 328. The principle has been explained and will not be repeated here.

[0165] Exemplarily, the method for preparing the first display screen 300 may be: Fig.15 , forming a first driving backplane 310, a pixel circuit 311 is provided in the first driving backplane 310 of the first display portion 302, and a pixel circuit 311 is not provided in the first driving backplane 310 of the light-transmitting portion 303, thereby preventing the pixel circuit 311 from affecting the transmittance of the light-transmitting portion 303. The first driving backplane 310 may include a substrate, and the substrate may form a support for the subsequently formed structural layer, and the substrate may be a flexible substrate (such as a polyimide substrate, a polyethylene substrate, etc.), or a rigid substrate (such as a glass substrate). A mask plate may be used to shield the substrate of the light-transmitting portion 303 and expose the substrate of the first display portion 302, so as to form a pixel circuit 311 on the substrate of the first display portion 302. Then, see Figure 16-Figure 19, a first anode layer 321, a first hole injection layer 324, a first hole transport layer 325, a first light-emitting material layer 322, a first electron transport layer 327, a first electron injection layer 326 and a first cathode layer 323 are sequentially formed on the first driving backplane 310 of the first display portion 302. A mask plate can be used to shield the first driving backplane 310 of the light-transmitting portion 303 and expose the first driving backplane 310 of the first display portion 302, so as to form a first light-emitting device layer 320 on the first driving backplane 310 of the first display portion 302, and form a hollow hole 328 corresponding to the light-transmitting portion 303 in the first light-emitting device layer 320. In this way, the first light-emitting device layer 320 is not provided in the light-transmitting portion 303, so that the first light-emitting device layer 320 can be prevented from affecting the transmittance of the light-transmitting portion 303. Then, see Fig. 20 , forming a first encapsulation layer 330 on the side of the first light emitting device layer 320 away from the first driving backplane 310, and filling a portion of the first encapsulation layer 330 into the hollow hole 328. Then, referring to Fig.12 A first cover plate 340 is formed on a side of the first encapsulation layer 330 away from the first driving backplane 310 .

[0166] The stacked structure layers of the second display screen 400 provided in the embodiment of the present application are described below.

[0167] See also Fig.10 and Fig.11 , the second display screen 400 may include a second driving backplane 410 and a second light emitting device layer 420, and the second driving backplane 410 and the second light emitting device layer 420 may be stacked. The second light emitting device layer 420 may include a second anode layer 421, a second cathode layer 423, and a second light emitting material layer 422, and the second light emitting material layer 422 may be located between the second anode layer 421 and the second cathode layer 423, and the second anode layer 421 may be located on the side of the second light emitting material layer 422 facing the second driving backplane 410. For example, the second light emitting material layer 422 may include a plurality of second light emitting units 4221. The second display screen 400 includes a plurality of pixels, and the plurality of pixels of the second display screen 400 may be arranged in an array. Each pixel of the second display screen 400 may include a plurality of second light emitting units 4221, for example, each pixel of the second display screen 400 may include three second light emitting units 4221. Its principle is similar to that of the first display screen 300, and will not be repeated.

[0168] Exemplarily, at least one of a second hole transport layer, a second hole injection layer, and a second electron blocking layer may be provided between the second anode layer 421 and the second light-emitting material layer 422. At least one of a second electron transport layer, a second electron injection layer, and a second hole blocking layer may be provided between the second cathode layer 423 and the second light-emitting material layer 422. The second display screen 400 may further include at least one of a second pixel defining layer 455, a second planarization layer 452, a second encapsulation layer 430, a second adhesive layer, a second cover plate 440, and a second color resist layer 454, the principle of which is similar to that of the first display screen 300 and will not be described in detail.

[0169] For example, see Fig.10 and Fig.11 , the second display screen 400 may include a lens layer 451, and the lens layer 451 may include a plurality of second lenses 4512, and the second lenses 4512 may be arranged one by one with the second light-emitting units 4221. The second lenses 4512 have a light collimating effect, which can improve the light extraction rate. For example, the lens layer 451 may be located between the second color resist layer 454 and the second encapsulation layer 430, and a third planarization layer 453 may be further provided on the side of the lens layer 451 facing the second encapsulation layer 430. Alternatively, the lens layer 451 may be located on the side of the second color resist layer 454 facing the second cover plate 440, and a third planarization layer 453 may be provided between the lens layer 451 and the second color resist layer 454.

[0170] The optical device layer 502 provided in the embodiment of the present application is described below.

[0171] See also Fig.10 and Fig.11The display module 39 may include an optical device layer 502, which may be located between the first display screen 300 and the second display screen 400. The optical device layer 502 has an imaging function. The light of the second light-emitting material layer 422 forms a virtual image after passing through the optical device layer 502. The optical device layer 502 can be used to image the surface of the second light-emitting material layer 422 facing the first display screen 300 to an imaging surface. Along the thickness direction of the first display screen 300, the distance between the imaging surface and the plane where the first light-emitting material layer 322 is located is less than or equal to 0.1 mm, so that the distance between the imaging surface and the plane where the first light-emitting material layer 322 is located is closer, so that the user is not easy to observe the splicing seam between the first display screen 300 and the second display screen 400, the images of the first display screen 300 and the second display screen 400 can be better combined, and the picture displayed by the display module 39 is more complete. For example, the distance between the imaging plane and the first light emitting material layer 322 may be 0 mm, 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm or any value less than 0.1 mm. The plane where the first light emitting material layer 322 is located may include the plane where the surface of the first light emitting material layer 322 is located away from the second display screen 400 and the plane where the surface of the first light emitting material layer 322 is located close to the second display screen 400.

[0172] For example, along the thickness direction of the first display screen 300, when the distance between the imaging surface and the plane where the surface of the first light-emitting material layer 322 facing away from the second display screen 400 is located is 0 mm, the imaging surface is flush with the surface of the first light-emitting material layer 322 facing away from the second display screen 400, which can more effectively prevent the user from observing the joint between the first display screen 300 and the second display screen 400. The surface of the first light-emitting material layer 322 facing away from the second display screen 400 can be regarded as the light-emitting surface of the first display screen 300 ( Fig.11 The surface of the second light-emitting material layer 422 facing the first display screen 300 can be regarded as the light-emitting surface of the second display screen 400 ( Fig.11 In this way, in the thickness direction of the first display screen 300, the second light emitting surface 422a is flush with the first light emitting surface 322a through the imaging surface of the optical device layer 502. Fig.11 , a point G2 of the second light-emitting material layer 422 has a virtual image position G1 after passing through the optical device layer 502 .

[0173] It can be understood that in an embodiment in which a second color resist layer 454 is provided in the second display screen 400, the distance between the second color resist layer 454 and the second light-emitting material layer 422 along the third direction Z can be set to be smaller, the thickness of the structural layer between the second color resist layer 454 and the second light-emitting material layer 422 can be ignored, and the second light-emitting surface 422a can be regarded as the surface of the second color resist layer 454 facing the first display screen 300.

[0174] In some examples, a light-transmitting layer 501 may be provided between the optical device layer 502 and the first display screen 300, and one side of the light-transmitting layer 501 is bonded to the optical device layer 502 to protect the optical device layer 502. The other side of the light-transmitting layer 501 is bonded to the first display screen 300, so that the stray light caused by the reflection of the air interface between the optical device layer 502 and the first display screen 300 (if the stray light just gathers on the imaging surface, a ghost image will be generated), thereby reducing the ghost image. In addition, the distance between the light-transmitting layer 501 and the first display screen 300 is relatively close, so that the distance between the first display screen 300 and the second display screen 400 is relatively close, which can effectively reduce the volume occupied by the display module 39, thereby helping to reduce the volume and weight of the electronic device 30 and improve the user experience. Alternatively, the other side of the light-transmitting layer 501 can be spaced apart from the first display screen 300. In some examples, a light-transmitting layer 501 may be provided between the optical device layer 502 and the second display screen 400, one side of the light-transmitting layer 501 may be bonded to the optical device layer 502, and the other side of the light-transmitting layer 501 may be bonded to or spaced from the second display screen 400, and the principle has been described and will not be repeated. Among them, a light-transmitting layer 501 may be provided at least one of between the optical device layer 502 and the first display screen 300 and between the optical device layer 502 and the second display screen 400. In some examples, the optical device layer 502 may be directly prepared on the backlight side of the first display screen 300, so that no other structural layers need to be prepared between the first display screen 300 and the optical device layer 502, so as to simplify the preparation process of the display module 39, facilitate the thinness of the display module 39, and also reduce stray light and ghost images. Alternatively, the optical device layer 502 can be directly prepared on the light-emitting side of the second display screen 400, so that there is no need to prepare other structural layers between the second display screen 400 and the optical device layer 502, so as to simplify the preparation process of the display module 39, facilitate the thinness of the display module 39, and also reduce stray light and ghost images. In some other examples, the optical device layer 502 can be spaced apart from the first display screen 300, and the light-transmitting layer 501 is not disposed between the optical device layer 502 and the first display screen 300, and / or, the optical device layer 502 can be spaced apart from the second display screen 400, and the light-transmitting layer 501 is not disposed between the optical device layer 502 and the second display screen 400.

[0175] Exemplarily, the light-transmitting layer 501 may be a material with high light transmittance and low refractive index, for example, the light-transmitting layer 501 may be a liquid optical clear resin (OCR for short). The material of the light-transmitting layer 501 may include but is not limited to organic silicone, acrylate or polyurethane.

[0176] In the embodiment where the second display screen 400 is connected to the first display screen 300 via the optical device layer 502 and the light-transmitting layer 501, the first display screen 300 and the second display screen 400 can be prevented from being misaligned during the subsequent assembly process, thereby ensuring that the images of the first display screen 300 and the second display screen 400 are well combined.

[0177] The optical device 502a provided in the embodiment of the present application is described below.

[0178] See also Fig.10 and Fig.11 , the optical device layer 502 may include a plurality of optical devices 502a, and one optical device 502a may correspond to at least one pixel of the second display screen 400. For example, one optical device 502a may correspond to (5-50)×(5-50) pixels of the second display screen 400, thereby preventing a single optical device 502a from covering too few pixels of the second display screen 400, preventing a single optical device 502a from being too small in size, making the single optical device 502a have a larger light receiving capacity, and thus making the light flux entering the single optical device 502a larger. In addition, it is also possible to prevent a single optical device 502a from covering too many pixels of the second display screen 400, preventing a single optical device 502a from being too large in size, and thus preventing a large difference in imaging effects between the center of the optical device 502a and the edge of the optical device 502a.

[0179] in, Fig.11 Part of the structural layers of the second display screen 400 on both sides of the second light-emitting material layer 422 in the thickness direction are omitted.

[0180] When the magnification of the optical device 502a is large, the distance between the two adjacent second light-emitting units 4221 of the second display unit 402 needs to be set larger, which will reduce the aperture ratio and pixel density of the second display screen 400, affect the display effect of the second display screen 400, and fail to meet the user's demand for high resolution of the high-attention area. When the magnification is small, there will be a large overlap between the two adjacent second light-emitting units 4221 of the second display screen 400, so that color mixing is likely to occur, affecting the display effect of the second display screen 400. Exemplarily, the magnification of the optical device 502a can range from 0.8 to 1.2, which can alleviate the above problems. For example, the magnification of the optical device 502a can be 0.8, 0.9, 1, 1.1, 1.2 or any value between 0.8 and 1.2. When the magnification of the optical device 502a is 1, the above problems can be avoided more effectively.

[0181] In some embodiments, see Figure 21-23 The optical device 502a may include a metasurface device 520, which is composed of artificially prepared sub-wavelength basic structural units arranged periodically and can regulate the phase, amplitude, polarization, etc. of the incident electromagnetic wave.

[0182] In some examples, the metasurface device 520 can achieve phase control by using the optical path difference generated during the propagation of electromagnetic waves, which is called a propagation phase metasurface device. Fig.21 ), the volume V1 of the adjustment member 5212 and the volume V2 of the phase adjustment member 521 have a ratio V1 / V2, and different equivalent refractive indices can be achieved by changing the ratio V1 / V2 to achieve the adjustment of the propagation phase. For example, along the direction from the edge to the center of the metasurface device 520, the total volume of the same phase adjustment member 521 can be divided into multiple unit volumes, and the volumes of any two unit volumes can be the same. By adjusting the ratio V1 / V2 of each unit volume of the phase adjustment member 521, the equivalent refractive index of each unit volume of the phase adjustment member 521 can be adjusted. See Fig.21 and Fig. 22 The metasurface device 520 may include a plurality of phase adjustment members 521, which may be arranged at intervals. The phase adjustment member 521 may include a substrate layer 5211 and a plurality of adjustment members 5212, which are arranged at intervals on the substrate layer 5211. The number of adjustment members 5212 in the same phase adjustment member 521 may be greater than or equal to 3, for example, 3, 4, 5, or 6 or more. Fig.21 and Fig. 22Only three phase adjustment elements 521 in the same metasurface device 520 are shown, and the remaining phase adjustment elements 521 are omitted. When the refractive index of the adjustment element 5212 is greater than the refractive index of the substrate layer 5211, the larger the ratio V1 / V2 of the phase adjustment element 521 per unit volume, the larger the proportion of the adjustment element 5212 with a high refractive index, the larger the equivalent refractive index of the phase adjustment element 521 per unit volume, and the larger the phase when the light passes through. When the refractive index of the adjustment element 5212 is less than the refractive index of the substrate layer 5211, the smaller the ratio V1 / V2 of the phase adjustment element 521 per unit volume, the smaller the proportion of the adjustment element 5212 with a low refractive index, the larger the equivalent refractive index of the phase adjustment element 521 per unit volume, and the larger the phase when the light passes through.

[0183] In the embodiment where the refractive index of the adjustment element 5212 is less than the refractive index of the substrate layer 5211, the ratio V1 / V2 of the same phase adjustment element 521 decreases along the direction from the edge to the center of the metasurface device 520, so that the phase of the same phase adjustment element 521 increases along the direction from the edge to the center of the metasurface device 520, so that there is a phase difference along the direction from the edge to the center of the metasurface device 520, thereby providing momentum in the direction of increasing phase difference for the transmitted light, so that the light is deflected toward the direction of increasing phase difference (deflected along the direction from the edge to the center of the metasurface device 520). Along the direction from the edge to the center of the metasurface device 520, the rate of decrease of the ratio V1 / V2 of each phase adjustment element 521 decreases, so that the rate of phase change of each phase adjustment element 521 along the direction from the edge to the center of the metasurface device 520 decreases, so that the degree of deflection of the light along the direction from the edge to the center of the metasurface device 520 is reduced, so as to realize the above-mentioned imaging function of the optical device 502a. In addition, the metasurface device 520 has the advantages of being easy to integrate, thin and compact, and provides the possibility of realizing a multifunctional and compact display module 39. The variation law of the ratio V1 / V2 can be adjusted by adjusting the cross-sectional area of ​​each adjusting member 5212 in the same phase adjusting member 521. Fig.21, along the direction from the edge to the center of the metasurface device 520, the cross-sectional areas of the respective adjusting members 5212 in the same phase adjusting member 521 decrease successively, and the rate of decrease of the cross-sectional areas of the adjusting members 5212 of each phase adjusting member 521 decreases, thereby adjusting the equivalent refractive index at different positions in the same phase adjusting member 521 to achieve a gradual change in the propagation phase. For example, at the edge of the metasurface device 520, the cross-sectional areas of the respective adjusting members 5212 in the same phase adjusting member 521 change faster, so that the phase changes faster. In the center of the metasurface device 520, the cross-sectional areas of the respective adjusting members 5212 of the same phase adjusting member 521 may remain almost unchanged. With such an arrangement, the refraction at the edge of the metasurface device 520 is larger, and the refraction at the center of the metasurface device 520 is almost non-existent. Alternatively, the variation law of the ratio V1 / V2 may be adjusted by adjusting the distance between two adjacent adjusting members 5212 in the same phase adjusting member 521. See. Fig. 22 , along the direction from the edge to the center of the metasurface device 520, the distance between two adjacent adjustment elements 5212 in the same phase adjustment element 521 decreases successively, and the increase rate of the distance between two adjacent adjustment elements 5212 of each phase adjustment element 521 decreases, thereby adjusting the equivalent refractive index at different positions in the same phase adjustment element 521 to achieve a gradual change in the propagation phase.

[0184] In the embodiment where the refractive index of the adjustment member 5212 is greater than the refractive index of the substrate layer 5211, along the direction from the edge to the center of the metasurface device 520, the ratio V1 / V2 of the same phase adjustment member 521 increases, and the rate of increase of the ratio V1 / V2 of each phase adjustment member 521 decreases. To achieve the above-mentioned imaging function of the optical device 502a, its principle is similar to that of the refractive index of the adjustment member 5212 being less than the refractive index of the substrate layer 5211, and will not be repeated. Among them, the variation law of the ratio V1 / V2 can be adjusted by adjusting the cross-sectional area size of each adjustment member 5212 in the same phase adjustment member 521. Along the direction from the edge to the center of the metasurface device 520, the cross-sectional area of ​​each adjustment member 5212 in the same phase adjustment member 521 increases successively, and the rate of increase of the cross-sectional area of ​​the adjustment member 5212 of each phase adjustment member 521 decreases. Alternatively, the variation rule of the ratio V1 / V2 can be adjusted by adjusting the distance between two adjacent adjustment members 5212 in the same phase adjustment member 521. In the same phase adjustment member 521, the distance between two adjacent adjustment members 5212 decreases in sequence from the edge to the center of the metasurface device 520, and the decreasing rate of the distance between two adjacent adjustment members 5212 of each phase adjustment member 521 decreases.

[0185] For some examples, see Fig.23The metasurface device 520 may include a substrate layer 5211 and an adjustment member 5212, and each adjustment member 5212 may be located on the substrate layer 5211. The geometric phase of the light (e.g., circularly polarized light) may be regulated by changing the rotation angle of the adjustment member 5212. Exemplarily, a plurality of adjustment members 5212 may be arranged at intervals along a preset direction, and the preset direction may include a first preset direction P1 and / or a second preset direction P2. For example, a plurality of adjustment members 5212 may be arranged at intervals in the first preset direction P1 and the second preset direction P2, and the first preset direction P1 and the second preset direction P2 may be different, for example, the first preset direction P1 and the second preset direction P2 may be perpendicular to each other.

[0186] For example, see Fig.23 and Fig.24 , a plurality of adjustment members 5212 arranged at intervals along the first preset direction P1 can form a first adjustment member group T1, the first adjustment member group T1 can be multiple, and the plurality of first adjustment member groups T1 can be arranged at intervals along the second preset direction P2. The metasurface device 520 may include a first end 520a and a second end 520b, and the first end 520a and the second end 520b may be two ends arranged opposite to each other along the first preset direction P1. In the direction from the first end 520a to the second end 520b, the adjustment member 5212 (equivalent to the second adjustment member 5212b) of the two adjacent adjustment members 5212 close to the second end 520b has a rotation angle relative to the adjustment member 5212 (equivalent to the first adjustment member 5212a) close to the first end 520a.

[0187] See also Fig.24 The two adjusting members 5212 adjacently arranged along the first preset direction P1 may include a first adjusting member 5212a and a second adjusting member 5212b. Fig.24The dotted box in is the position of the first adjusting member 5212a when the center of the first adjusting member 5212a and the center of the second adjusting member 5212b are overlapped. The extension direction of the dotted box after rotating counterclockwise by α can be the same as the extension direction of the second adjusting member 5212b. For example, the dotted box can overlap with the second adjusting member 5212b after rotating counterclockwise by α. Among them, the rotation direction of the second adjusting member 5212b relative to the rotation angle of the first adjusting member 5212a is counterclockwise, and the magnitude of the rotation angle is α. In the direction from the first end 520a to the second end 520b, the rotation directions of the rotation angles of the multiple adjusting members 5212 of the same first adjusting member group T1 can all be the same. In the first preset direction P1, along the direction from the edge to the center of the meta-surface device 520, the rotation angles of the multiple adjusting members 5212 of the same first adjusting member group T1 decrease successively, and the rate of decrease of the rotation angle decreases. In addition, a plurality of adjustment members 5212 arranged at intervals along the second preset direction P2 can form a second adjustment member group T2, and the second adjustment member group T2 can be multiple, and the plurality of second adjustment member groups T2 can be arranged at intervals along the first preset direction P1. From one end to the other end on the second preset direction P2, the adjustment member 5212 close to one end of two adjacent adjustment members 5212 has a rotation angle relative to the adjustment member 5212 close to the other end. From one end to the other end on the second preset direction P2, the rotation directions of the rotation angles of the plurality of adjustment members 5212 of the same second adjustment member group T2 can be the same. In the second preset direction P2, along the direction from the edge to the center of the meta-structured surface device 520, the rotation angles of the plurality of adjustment members 5212 of the same second adjustment member group T2 decrease successively, and the rate of decrease of the rotation angle decreases. In this way, the constructed meta-structured surface device 520 has the above-mentioned imaging function.

[0188] Exemplarily, the metasurface device 520 can be prepared by nanoimprinting or electron beam etching.

[0189] Exemplarily, the distance from the center to the edge of the phase adjustment element 521 may range from 5 nm to 500 nm. For example, the distance from the center to the edge of the phase adjustment element 521 may range from 5 nm, 50 nm, 100 nm, 250 nm, 500 nm, or any value between 5 nm and 500 nm.

[0190] Exemplarily, the materials of the substrate layer 5211 and the adjusting member 5212 may be different. For example, the substrate layer 5211 and / or the adjusting member 5212 may include dielectric materials such as single crystal silicon, silicon dioxide, titanium dioxide, or non-dielectric materials such as semiconductors and metals.

[0191] Exemplarily, the cross-sectional shape of the adjusting member 5212 may include, but is not limited to, circular, elliptical, rectangular, triangular or V-shaped.

[0192] In some embodiments, see Fig.11 , the optical device 502a may include a lens (third lens 513), and the thickness of the third lens 513 gradually decreases or increases along the direction from the edge to the center of the third lens 513, and the change rate of the thickness of the third lens 513 gradually decreases. The third lens 513 can change the surface morphology of the third lens 513 by changing the thickness to achieve a phase rate gradient at different positions along the direction from the edge to the center of the third lens 513, so that the constructed third lens 513 has the above-mentioned imaging function.

[0193] Exemplarily, the material of the third lens 513 may include polyester materials, such as polymethyl methacrylate (PMMA for short), polydimethylsiloxane (PDMS for short), and the like.

[0194] Exemplarily, the third lens 513 may include a micro lens, and the optical device layer 502 may be a micro lens array (MLA). For example, the third lens 513 may include a plano-convex lens, a bi-convex lens, a plano-concave lens, a bi-concave lens or other lenses.

[0195] According to the Gaussian imaging formula, the inverse of the object distance plus the inverse of the image distance equals the inverse of the focal length. Fig.11 ) passes through the imaging surface of the optical device layer 502 and the first light emitting surface 322a ( Fig.11 ), the distance b between the third lens 513 and the second light-emitting material layer 422 is equivalent to the object distance, the distance a between the third lens 513 and the first light-emitting material layer 322 is equivalent to the image distance, and the focal length of the third lens 513 is f. Therefore, 1 / f=1 / a+1 / b, and it can be deduced that:

[0196] Therefore, the above formula can be satisfied by adjusting the distance b between the third lens 513 and the second light-emitting material layer 422 (for example, the second light-emitting surface 422a), the distance a between the third lens 513 and the first light-emitting material layer 322 (for example, the first light-emitting surface 322a), and the focal length f, so that the imaging surface of the second light-emitting surface 422a passing through the optical device layer 502 is flush with the first light-emitting surface 322a, so that the user cannot easily observe the splicing seam between the first display screen 300 and the second display screen 400.

[0197] Understandably, see Fig.11When other lenses are arranged between the third lens 513 and the second light-emitting material layer 422, for example, the second lens 4512 is arranged, the light of the second light-emitting material layer 422 must first pass through the second lens 4512 for imaging before reaching the third lens 513, and the distance b between the third lens 513 and the second light-emitting material layer 422 may be the distance between the third lens 513 and the virtual image of the second light-emitting material layer 422 formed by the second lens 4512. When other lenses are not arranged between the third lens 513 and the second light-emitting material layer 422, the distance b between the third lens 513 and the second light-emitting material layer 422 may be the distance between the third lens 513 and the entity of the second light-emitting material layer 422.

[0198] Exemplarily, the distance from the center to the edge of the third lens 513 may range from 20 μm to 50 μm, for example, the distance from the center to the edge of the third lens 513 may be 20 μm, 30 μm, 40 μm, 50 μm, or any value between 20 μm and 50 μm. The radius of curvature of the third lens 513 may range from 20 μm to 50 μm, for example, the radius of curvature of the third lens 513 may be 20 μm, 30 μm, 40 μm, 50 μm, or any value between 20 μm and 50 μm.

[0199] In some embodiments, see Fig.25 , the optical device 502a may include a plurality of sub-optical devices 531, each of which may be annular. The plurality of sub-optical devices 531 are sequentially arranged from the inside to the outside and are connected to each other. Along the direction from the edge to the center of the optical device 502a, the refractive index of the plurality of sub-optical devices 531 increases sequentially, and the increase rate of the refractive index of the plurality of sub-optical devices 531 decreases. In this way, the plurality of sub-optical devices 531 in the same optical device 502a can realize the phase rate gradient at different positions along the direction from the edge to the center of the optical device 502a through the difference in refractive index, so that the constructed optical device 502a has the above-mentioned imaging function. For example, a plurality of sub-optical devices 531 may be prepared by a holographic method to form the optical device 502a.

[0200] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0201] The terms "first," "second," "third," "fourth," etc., if any, are used to distinguish between similar objects and not necessarily to describe a particular sequence or order.

[0202] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display module, characterized in that: It comprises a first display screen and a second display screen, wherein the directions from the light emitting side to the backlight side of the first display screen and the second display screen are the same, and the second display screen is located on the backlight side of the first display screen; The first display screen includes a light-transmitting portion and a first display portion, and a projection of the second display screen in a thickness direction of the display module covers the light-transmitting portion; The pixel density of the first display screen is smaller than the pixel density of the second display screen.

2. The display module according to claim 1, characterized in that: The second display screen includes a second display portion, and a projection of the second display screen in a thickness direction of the display module covers the light-transmitting portion, including: a projection of the second display portion in a thickness direction of the display module covers the light-transmitting portion.

3. The display module according to claim 2, characterized in that: The second display portion includes a main display portion and a redundant display portion, the redundant display portion is arranged on at least a portion of the periphery of the main display portion, and the projection of the second display portion in the thickness direction of the display module covers the light-transmitting portion, including: the projection of the main display portion in the thickness direction of the display module coincides with the light-transmitting portion, and the projection of the redundant display portion in the thickness direction of the display module at least partially covers the first display portion.

4. The display module according to claim 2, characterized in that: The second display screen includes a non-display portion, which is disposed on at least a portion of an outer periphery of the second display portion, and a projection of the non-display portion in a thickness direction of the display module at least partially covers the first display portion.

5. The display module according to any one of claims 1 to 4, characterized in that: The light-transmitting portion includes a through hole, and the through hole penetrates the first display screen along the thickness direction of the first display screen; Alternatively, the first display screen includes a driving backplane, a first light-emitting device layer and a packaging layer which are stacked in sequence, a pixel circuit is arranged in the driving backplane located in the first display part, a hollow hole is provided in the light-transmitting part, the hollow hole penetrates the first light-emitting device layer along the thickness direction of the first display screen, and part of the packaging layer is inserted in the hollow hole.

6. The display module according to any one of claims 1 to 4, characterized in that: It also includes an optical device layer, the optical device layer is located between the first display screen and the second display screen, the optical device layer includes a plurality of optical devices, and one of the optical devices corresponds to at least one pixel of the second display screen; The first display screen includes a first light emitting device layer, the first light emitting device layer includes a first light emitting material layer, the second display screen includes a second light emitting device layer, the second light emitting device layer includes a second light emitting material layer; The optical device layer is used to image the surface of the second luminescent material layer facing the first display screen onto an imaging surface, and along the thickness direction of the first display screen, the distance between the imaging surface and the plane where the first luminescent material layer is located is less than or equal to 0.1 mm.

7. The display module according to claim 6, characterized in that: The imaging surface is flush with a surface of the first luminescent material layer facing away from the second display screen.

8. The display module according to claim 6, characterized in that: The optical device comprises a lens, wherein the thickness of the lens gradually decreases or increases along a direction from an edge to a center of the lens, and a changing rate of the thickness of the lens gradually decreases.

9. The display module according to claim 6, characterized in that: The optical device comprises a metasurface device, the metasurface device comprises a plurality of phase adjustment members arranged at intervals, the phase adjustment member comprises a substrate layer and a plurality of adjustment members, and the plurality of adjustment members are arranged at intervals on the substrate layer; Within a unit volume of the phase adjusting member, the volume of the adjusting member has a ratio to the volume of the phase adjusting member; The refractive index of the adjusting element is greater than the refractive index of the substrate layer, and along the direction from the edge to the center of the metasurface device, the ratio of the same phase adjusting element increases, and the increasing rate of the ratio of each phase adjusting element decreases; or, The refractive index of the adjustment element is smaller than the refractive index of the substrate layer. Along the direction from the edge to the center of the metasurface device, the ratio of the same phase adjustment element decreases, and the reduction rate of the ratio of each phase adjustment element decreases.

10. The display module according to claim 6, characterized in that: The optical device includes a metasurface device, the metasurface device includes a substrate layer and a plurality of adjustment members, and the plurality of adjustment members are arranged at intervals along a preset direction; The metasurface device comprises a first end and a second end arranged along the preset direction, and in the direction from the first end to the second end, the adjusting member close to the second end of two adjacent adjusting members has a rotation angle relative to the adjusting member close to the first end, and the rotation directions of the rotation angles of the plurality of adjusting members are the same; In the preset direction, along the direction from the edge to the center of the metasurface device, the rotation angles of the plurality of adjustment members decrease in sequence, and the decreasing rate of the rotation angle decreases.

11. The display module according to claim 6, characterized in that: The optical device includes a plurality of annular sub-optical devices, which are arranged in sequence from the inside to the outside and connected to each other. Along the direction from the edge to the center of the optical device, the refractive index of the plurality of sub-optical devices increases in sequence, and the increase rate of the refractive index of the plurality of sub-optical devices decreases.

12. The display module according to claim 6, characterized in that: The magnification of the optical device ranges from 0.8 to 1.

2.

13. The display module according to claim 6, characterized in that: The optical device further includes a light-transmitting layer, which is located at least one of between the optical device layer and the first display screen and between the optical device layer and the second display screen.

14. The display module according to any one of claims 1 to 4, characterized in that: A plurality of conductive lines are arranged in the first display portion, and each of the conductive lines extends from one end of the first display screen to the other end of the first display screen along an extension direction parallel to the first display screen; A partial number of the conductive wires include two extension portions and a bending portion located between the two extension portions, the two extension portions are respectively located on both sides of the light-transmitting portion, at least a portion of the bending portions are located on one side of the light-transmitting portion along a direction perpendicular to one of the two extension portions to the other, the extension portions and the bending portions are arranged in different layers, and are arranged in the same layer as another partial number of the conductive wires.

15. The display module according to any one of claims 1 to 4, characterized in that: The pixel density of the first display screen ranges from 400 pixels / inch to 1700 pixels / inch; The pixel density of the second display screen is greater than or equal to 3000 pixels / inch.

16. The display module according to any one of claims 1 to 4, characterized in that: A distance between a center of the light-transmitting portion and a center of the first display screen is less than or equal to 0.1 mm.

17. The display module according to any one of claims 1 to 4, characterized in that: The first display portion is disposed on at least a portion of the outer periphery of the light-transmitting portion.

18. An electronic device, characterized in that: It comprises a lens assembly and the display module described in any one of claims 1 to 17, wherein the lens assembly is located on the light-emitting side of the first display screen of the display module.

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