Display assembly and display device

Abstract

A display assembly comprises a back plate, a light-emitting part and a light guide part. And the light-emitting part is positioned on one side of the back plate and is electrically connected with the back plate. The light-emitting part comprises a plurality of light-emitting sub-parts. The light-emitting parts are sequentially arranged in the first direction. The first direction is perpendicular to the thickness direction of the back plate. And each light-emitting sub-part is configured to emit light of one color. And the light guide piece is positioned on one side, far away from the back plate, of the light-emitting part. And the light guide part covers the light emitting part along the thickness direction of the back plate. Wherein the light guide part is configured to convert light rays which are emitted by the plurality of light-emitting sub-parts and are incident to the light guide part into light rays which share the same optical axis and are equal in image moment, and the light rays are emitted out.

Description

Display assembly and display device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a display assembly and a display device. BACKGROUND

[0002] With the development of virtual reality (VR), augmented reality (AR) and mixed reality (MR) technologies, higher requirements are put forward for near-eye display devices.

[0003] SUMMARY

[0004] In one aspect, a display assembly is provided, comprising: a back plate, a light emitting part and a light guide. The light emitting part is located on one side of the back plate and is electrically connected to the back plate. The light emitting part comprises a plurality of light emitting sub-parts. The plurality of light emitting sub-parts are arranged in sequence along a first direction. The first direction is perpendicular to the thickness direction of the back plate. Each light emitting sub-part is configured to emit light of a color. The light guide is located on the side of the light emitting part away from the back plate. Along the thickness direction of the back plate, the light guide covers the light emitting part. The light guide is configured to convert the light emitted by the plurality of light emitting sub-parts and incident on the light guide into light of the same optical axis and equal image size, and emit the light.

[0005] In some embodiments, the light emitting sub-part comprises a plurality of light emitting elements arranged in an array. The light emitting elements are electrically connected to the back plate.

[0006] In some embodiments, the light emitting elements comprise micro light emitting diodes or organic light emitting devices.

[0007] In some embodiments, the light emitting part further comprises a light shielding layer located between adjacent two light emitting sub-parts.

[0008] In some embodiments, the light guide comprises a plurality of first prisms arranged in sequence along the first direction. The first prisms comprise a first surface and a light filtering film. The light filtering film covers at least a portion of the first surface. The included angle between the first surface and the positive direction of the first direction is an acute angle. Along the thickness direction of the back plate, the light filtering films of the plurality of first prisms cover the plurality of light emitting sub-parts, respectively. The light filtering films are configured to reflect the light emitted by the light emitting sub-part covered thereby and incident on the light filtering film, and transmit the light emitted by other light emitting sub-parts and incident on the light filtering film.

[0009] In some embodiments, the light emitted by the plurality of light filtering films is of the same optical axis.

[0010] In some embodiments, the first prisms are coincident in their orthographic projections along the first direction. The planes on which the light filtering films of the first prisms are located are parallel to each other.

[0011] In some embodiments, the light guide further comprises second prisms located on the light exit side of the first prisms. The second prisms have a dimension along the first direction that is greater than the dimension of the first prisms along the first direction.

[0012] In some embodiments, the light guide further comprises a lens group. The lens group is located on the light exit side of the first prisms, and the side surface of the lens group away from the first prisms constitutes the light exit surface of the light guide. The lens group is configured to convert the light rays that exit the first prisms and are incident on the lens group into light rays with equal image distances.

[0013] In some embodiments, the lens group is coaxial with the light filtering films.

[0014] In some embodiments, the lens group comprises a diffractive lens. The diffractive lens has at least one microstructure. The microstructure is configured to adjust the focal length of the diffractive lens and adjust the phase of the light rays incident on the microstructure, and adjust the light rays that exit the diffractive lens into light rays with equal image distances.

[0015] In some embodiments, the refractive index of the material of the microstructure is greater than or equal to 1.9.

[0016] In some embodiments, the microstructure has an axial symmetric shape in the top view on the plane on which the back plate is located.

[0017] In some embodiments, the diffractive lens further has a substrate, and the microstructure is located on the substrate. The microstructure is convex relative to the substrate.

[0018] In some embodiments, the shape of the microstructure comprises a column or a cylinder. Or the diffractive lens comprises one microstructure, and the shape of the microstructure is a mesh or a combination of multiple columns in multiple mesh holes.

[0019] In some embodiments, the heights of the microstructures are equal or approximately equal.

[0020] In some embodiments, the microstructures are arranged in an array. The arrangement period of the microstructures is 200-500 nm, the dimension of the microstructure along the first direction is a first dimension, and the ratio of the height of the microstructure to the first dimension is in the range of 3:1-20:1.

[0021] In some embodiments, the lens group further comprises at least one refractive lens. The at least one refractive lens is co-axial with the diffractive lens.

[0022] In some embodiments, the lens group comprises a holographic lens.

[0023] In another aspect, a display device is also provided, comprising a display assembly as described in any of the above embodiments, and an imaging assembly located on the light-out side of the display assembly. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present disclosure, the following will briefly introduce the drawings needed to be used in some embodiments of the present disclosure. Obviously, the drawings described in the following description are only the drawings of some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art according to these drawings. In addition, the drawings described in the following description can be regarded as schematic diagrams, and are not limited to the actual size of the products involved in the embodiments of the present disclosure.

[0025] FIG. 1 is a structural diagram of a display device according to some embodiments of the present disclosure;

[0026] FIG. 2 is a structural diagram of another display device according to some embodiments of the present disclosure;

[0027] FIG. 3 is a structural diagram of a display device according to a first implementation;

[0028] FIG. 4 is a structural diagram of a display device according to a second implementation;

[0029] FIG. 5 is a structural diagram of a display device according to a third implementation;

[0030] FIG. 6 is a structural diagram of a display device according to a fourth implementation;

[0031] FIG. 7 is a graph of the relationship between the normalized electroluminescence spectral intensity, wavelength and current density according to the fourth implementation;

[0032] FIG. 8 is a structural diagram of a display device in the process of preparation according to a fifth implementation;

[0033] FIG. 9 is a structural diagram of another display device according to some embodiments of the present disclosure;

[0034] FIG. 10 is a structural diagram of a display assembly according to some embodiments of the present disclosure;

[0035] FIG. 11 is a structural diagram of a back plate and a light-emitting part according to some embodiments of the present disclosure;

[0036] FIG. 12 is a structure diagram of another back plate and light emitting part according to some embodiments of the present disclosure;

[0037] FIG. 13 is a structure diagram of yet another back plate and light emitting part according to some embodiments of the present disclosure;

[0038] FIG. 14 is a structure diagram of another display assembly according to some embodiments of the present disclosure;

[0039] FIG. 15 is a structure diagram of yet another display assembly according to some embodiments of the present disclosure;

[0040] FIG. 16 is a structure diagram of a first sub-mirror according to some embodiments of the present disclosure;

[0041] FIG. 17 is a structure diagram of a second sub-mirror or a third sub-mirror according to some embodiments of the present disclosure;

[0042] FIG. 18 is a structure diagram of yet another display assembly according to some embodiments of the present disclosure;

[0043] FIG. 19 is a structure diagram of yet another display assembly according to some embodiments of the present disclosure;

[0044] FIG. 20 is a structure diagram of yet another display assembly according to some embodiments of the present disclosure;

[0045] FIG. 21 is a structure diagram of yet another display assembly according to some embodiments of the present disclosure;

[0046] FIG. 22 is a structure diagram of yet another display assembly according to some embodiments of the present disclosure;

[0047] FIG. 23 is a structure diagram of a diffractive lens according to some embodiments of the present disclosure;

[0048] FIG. 24 is a phase calculation diagram of a diffractive lens according to some embodiments of the present disclosure;

[0049] FIG. 25 is a phase diagram of a microstructure according to some embodiments of the present disclosure;

[0050] FIG. 26 is a structure diagram of a microstructure according to some embodiments of the present disclosure;

[0051] FIG. 27 is a structure diagram of another four microstructures according to some embodiments of the present disclosure;

[0052] FIG. 28 is a structure diagram of yet two microstructures according to some embodiments of the present disclosure;

[0053] FIG. 29 is a structure diagram of yet another microstructure according to some embodiments of the present disclosure;

[0054] FIG. 30 is a structural diagram of yet two microstructures in some embodiments according to the present disclosure;

[0055] FIG. 31 is a structural diagram of yet two microstructures in some embodiments according to the present disclosure;

[0056] FIG. 32 is a structural diagram of yet another display assembly in some embodiments according to the present disclosure;

[0057] FIG. 33 is a preparation optical path diagram of a holographic lens in some embodiments according to the present disclosure. DETAILED DESCRIPTION

[0058] The technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present disclosure.

[0059] Unless otherwise required by context, the term “comprise” and other forms thereof such as “comprises” and “comprising” are to be construed as open, inclusive, meaning that “comprising” means “including, but not limited to.” In the description of the specification, the terms “one embodiment,” “some embodiments,” “exemplary embodiments,” “example,” “specific example” or “some examples” are intended to indicate that a specific feature, structure, material, or characteristic being discussed is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics can be included in any one or more embodiments or examples in any appropriate manner.

[0060] Hereinafter, the terms “first” and “second” are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of “a plurality of” is two or more.

[0061] “A and / or B” includes the following three combinations: only A, only B, and a combination of A and B.

[0062] The use of “adapted for” or “configured for” herein means open and inclusive language that is not closed- or limited to devices that perform only the recited task or step.

[0063] As used herein, “about,” “substantially,” or “approximately” includes the recited value and the average value within an acceptable range of deviation from the recited value, as determined by one of ordinary skill in the art considering the measurement in question and the error in measuring the particular quantity (i.e., the limitations of the measurement system).

[0064] In describing some embodiments, “connected” and / or terms of similar meaning can be used. The term “connected” is used broadly and exemplarily, and can be a direct connection, or an indirect connection via another part, and can be fixedly connected, removably connected, or integral.

[0065] As used herein, “perpendicular,” “equal” includes the recited condition and conditions that approximate the recited condition, the approximation being within an acceptable range of deviation, as determined by one of ordinary skill in the art considering the measurement in question and the error in measuring the particular quantity (i.e., the limitations of the measurement system). For example, “perpendicular” includes absolute perpendicularity and near perpendicularity, where near perpendicularity can be within an acceptable range of deviation of, for example, 5°. “Equal” includes absolute equality and near equality, where near equality can be within an acceptable range of deviation of, for example, less than or equal to 5% of either of the two quantities being compared.

[0066] It will be understood that when a layer or element is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers can also be present.

[0067] Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are idealized examples. In the drawings, the thickness of layers and regions are exaggerated for clarity. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region illustrated as a rectangle will typically have rounded or curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.

[0068] Some embodiments of the present disclosure provide a display device. The display device can be any display device that displays both motion (e.g., video) and still (e.g., still image) and both text and image.

[0069] For example, the display device 1 can be a head-up display (HUD), a projector (see FIG. 1), a near-eye display device such as a head-mounted or wearable display device (see FIG. 2), or the like.

[0070] There are various structures of the display device 1 described above.

[0071] In a first implementation, as shown in FIG. 3, the display device 1 includes three independent monochrome micro-displays 10F and a light combining prism 10G (also referred to as an X prism), the three monochrome micro-displays 10F are sequentially in contact with each other, two adjacent monochrome micro-displays 10F are perpendicular to each other, and two monochrome micro-displays 10F that are not in contact are parallel to each other. The three dashed arrows in FIG. 3 represent the exit paths of the light rays emitted by the three monochrome micro-displays 10F. This display device requires three independently arranged monochrome micro-displays, and the preparation cost of the display device is relatively high. In addition, the arrangement of the three monochrome micro-displays occupies a relatively large space, which leads to a relatively large volume of the display device, and is not conducive to the miniaturization and lightweight design of the display device.

[0072] In a second implementation, as shown in FIG. 4, the display device 1 includes a plurality of light-emitting diodes 10H and a color conversion pattern 10J on the light-emitting diodes. Each light-emitting diode 10H and its corresponding color conversion pattern 10J constitute a red sub-pixel, a green sub-pixel, or a blue sub-pixel. The dashed arrows in FIG. 4 represent the light exit direction of the sub-pixels. Adjacent or nearby red sub-pixels, green sub-pixels, and blue sub-pixels constitute a pixel unit, and a plurality of pixel units are arranged in an array. In the case of a high resolution of the display device, since the types of adjacent color conversion patterns 10J are different (for example, the types of the color conversion patterns 10J in the case of two adjacent sub-pixels being a red sub-pixel and a green sub-pixel respectively refer to the color conversion pattern in the red sub-pixel converting the light emitted by the light-emitting diode into red, and the color conversion pattern in the green sub-pixel converting the light emitted by the light-emitting diode into green), each color conversion pattern 10J needs to be prepared respectively. Since the size of the sub-pixel is small, the size of the corresponding color conversion pattern 10J is also small, which makes the preparation of the color conversion pattern 10J difficult, and the light emitted by the light-emitting diode 10H has a certain loss after exiting through the color conversion pattern 10J, thereby limiting the light brightness of the display device.

[0073] In a third implementation, as shown in FIG. 5, the display device 1 is prepared by using a three-color micro-display stacking technology. Specifically, light-emitting layers 10K of different colors, such as red light-emitting layers, green light-emitting layers, and blue light-emitting layers, are stacked in sequence along the thickness direction of the display device 1. The dashed arrows in FIG. 5 represent the light-emitting direction of the light-emitting layers 10K. The device integration degree of the display device is high, however, the stacking of the three light-emitting layers 10K inevitably causes light loss during the light-emitting process, which reduces the light-emitting brightness of the display device. Moreover, the preparation process of the three-color micro-display stacking technology is relatively complex, which results in a low yield of the display device and a high production cost.

[0074] In a fourth implementation, as shown in FIG. 6, the display device 1 includes a single display screen 10M, and the display screen 10M emits light of different colors by controlling the current density of the input display screen 10M. With reference to FIG. 7, in the case of a small current density, the display screen 10M displays red light, however, the brightness of the display screen 10M is low. In the case of a high current density, the gray scale of the display image is not easy to control, which is not conducive to achieving high brightness and high color gamut display of the display device.

[0075] In a fifth implementation, the display device includes a silicon substrate 10N and an organic light-emitting device 10P. As shown in FIG. 8, the organic light-emitting device 10P is prepared by using a Fine Metal Mask (FMM) as a mask and by using an evaporation process. The evaporation source 10Q evaporates light-emitting materials through the FMM to the silicon substrate 10N. However, due to the process limitation of the FMM, the resolution of the display device is low. In order to overcome the defect of low resolution, a white light-emitting device and a color film are used to provide light of different colors. However, the introduction of the color film reduces the light-emitting efficiency of the display device and the color gamut.

[0076] Based on this, some embodiments of the present disclosure provide a display device, as shown in FIG. 9, which includes a display assembly 10 and an imaging assembly 20.

[0077] For example, the display assembly 10 can be a projection light machine, a projection unit, an image generator, a near-eye display assembly, etc.

[0078] For example, in the case of the display device 1 being a projector, the imaging assembly can be a projection screen.

[0079] For example, as shown in FIG. 9, in the case of the display device 1 being a near-eye display device, the imaging assembly 20 includes a light waveguide plate 21, a coupling-out element 22, and a coupling-in element 23.

[0080] For example, the coupling-out element 22 and the coupling-in element 23 are located on one side of the light waveguide plate 21. The coupling-out element 22 is spaced apart from the coupling-in element 23 and located on the same side of the light waveguide plate 21.

[0081] For another example, the coupling-out element 22 and the coupling-in element 23 are embedded on the side of the light waveguide plate 21 close to the display assembly 10.

[0082] As shown in FIG. 9, the coupling-in element 23 is arranged corresponding to the light exit side of the display assembly 10. The light emitted by the display assembly 10 is incident on the coupling-in element 23, transmitted in the light waveguide plate 21 to the coupling-out element 22, and emitted from the coupling-out element 22. The human eye E can view the display image on the light exit side of the coupling-out element 22.

[0083] It can be understood that in FIG. 9, the dashed line with an arrow represents the propagation path of the emitted light.

[0084] In some embodiments, as shown in FIG. 10, the display assembly 10 includes a back plate 11, a light emitting part 12, and a light guide part 13.

[0085] For example, the back plate 11 includes a substrate and a circuit structure layer on one side of the substrate. The substrate serves as a carrier of the circuit structure layer.

[0086] The type of the substrate includes various types, which can be selected and arranged according to actual needs.

[0087] For example, the substrate can be a rigid substrate. The rigid substrate can be a glass substrate or a PMMA (Polymethyl methacrylate) substrate, etc. The first substrate can also be a printed circuit board (PCB), an aluminum substrate, etc.

[0088] For example, the substrate can be a flexible substrate. The flexible substrate can be a PET (Polyethylene terephthalate) substrate, a PEN (Polyethylene naphthalate two formic acid glycol ester) substrate, or a PI (Polyimide) substrate, etc. In some examples, the circuit structure layer includes a plurality of pixel circuits. The plurality of pixel circuits can be arranged in an array.

[0089] Exemplarily, the structure of the pixel circuit can include various structures, and embodiments of the present disclosure are not limited thereto. For example, the structure of the pixel circuit can be a "2T1C", "6T1C", "7T1C", "6T2C", "7T2C", or the like; wherein "T" represents a transistor, the number in front of "T" represents the number of transistors, "C" represents a storage capacitor, and the number in front of "C" represents the number of storage capacitors.

[0090] Exemplarily, the type of the transistor is not limited. For example, the transistor can be an oxide thin film transistor (Oxide TFT) or a low-temperature polysilicon thin film transistor (LTPS TFT).

[0091] In some other examples, the circuit structure layer includes a plurality of driving chips. The plurality of driving chips are arranged in an array.

[0092] In some examples, as shown in FIG. 10, the light emitting part 12 is located on one side of the back plate 11 and is electrically connected with the back plate 11. The light emitting part 12 emits light under the control of the back plate 11.

[0093] Specifically, the light emitting part 12 includes a plurality of light emitting sub-parts 121. For example, the light emitting part 12 includes three light emitting sub-parts 121.

[0094] For the convenience of description, the following will be described by taking an example that the light emitting part 12 includes three light emitting sub-parts 121.

[0095] As shown in FIG. 11, the plurality of light emitting sub-parts 121 are arranged in sequence along a first direction A. The first direction A is perpendicular to the thickness direction of the back plate 11. The thickness direction of the back plate 11 can be a third direction C.

[0096] For example, as shown in FIG. 11, the three light emitting sub-parts 121 are arranged in sequence and closely along the first direction A. Alternatively, as shown in FIG. 12, the three light emitting sub-parts 121 are arranged in sequence and spaced apart along the first direction A.

[0097] The plurality of light emitting sub-parts 121 are arranged in the same direction, which can make the size of the plurality of light emitting parts 12 in the thickness direction of the back plate 11 smaller, thereby facilitating the reduction of the volume of the display assembly 10, so as to reduce the size of the display device 1 and realize the lightweight design of the display device 1.

[0098] Exemplarily, each light emitting sub-part 121 is configured to emit light of one color.

[0099] For example, the three light emitting sub-parts 121 can include a first light emitting sub-part 1201, a second light emitting sub-part 1202, and a third light emitting sub-part 1203, the first light emitting sub-part 1201 emits red light, the second light emitting sub-part 1202 emits green light, and the third light emitting sub-part 1203 emits blue light.

[0100] Thus, different light emitting sub-units 121 can be respectively optimized, which is conducive to improving the brightness of the light emitting sub-units 121 and the colorization degree of the light emitting unit 12, and further improving the color gamut of the image displayed by the display assembly 10. Moreover, the same light emitting sub-unit 121 emits light of the same color, which can reduce the difficulty of manufacturing the light emitting sub-unit 121 to some extent and improve the display resolution of the display assembly 10.

[0101] For example, each light emitting sub-unit 121 is connected to the same back plate 11, so that the alignment accuracy between the light emitting sub-units 121 and the back plate 11 is high, and each light emitting sub-unit 121 is arranged in the same direction, which can reduce the assembly difficulty between the light emitting sub-units 121 and the light guide 13, and is conducive to improving the manufacturing yield of the display assembly 10 and reducing the manufacturing cost of the display assembly 10.

[0102] In some examples, as shown in FIG. 10, the light guide 13 is located on the side of the light emitting unit 12 away from the back plate 11. The light guide 13 covers the light emitting unit 12 along the thickness direction of the back plate 11. For example, the orthographic projection of the light emitting unit 12 on the plane of the back plate 11 is within the orthographic projection range of the light guide 13 on the plane of the back plate 11.

[0103] Thus, most or all of the light emitted by the light emitting unit 12 can be incident on the light guide 13, thereby reducing the loss of light.

[0104] For example, the light guide 13 is configured to convert the light emitted by the plurality of light emitting sub-units 121 and incident on the light guide 13 into light of the same optical axis and equal image distance.

[0105] Based on this, the red light, green light and blue light emitted by the light guide 13 and projected onto the imaging assembly 20 can form a red image, a green image and a blue image that can converge together to form an image with high display quality, and can be imaged on the imaging assembly 20 (for example, the distance between the imaging assembly 20 and the light guide 13 can be set as an image distance), so that the display quality of the image displayed by the display device 1 is high. Compared with the display device in the above implementation manner, the display assembly 10 provided by the embodiment of the present disclosure does not need to pass through a color conversion pattern, and to some extent, reduces the loss of light during emission, so as to ensure that the light emitted by the display assembly 10 and the display device 1 has high brightness.

[0106] The display assembly 10 provided by the embodiment of the present disclosure has the advantages that: by arranging a plurality of light emitting sub-parts 121 along the first direction A, and each light emitting part 12 emits light of one color, the plurality of light emitting sub-parts 121 occupy a smaller size in the thickness direction of the back plate 11, which is beneficial to realize the miniaturization and lightweight design of the display assembly 10 and the display device 1. In addition, the light guide piece 13 is arranged on one side of the light emitting part 12 and covers the light emitting part 12, so that the light emitted by the plurality of light emitting sub-parts 121 and incident on the light guide piece 13 is converted into light of the same optical axis and equal image distance, thereby converging different colors of light together to form an image with higher brightness and higher color gamut, thereby improving the image display quality of the display assembly 10 and the display device 1 and improving the user experience.

[0107] For example, the shapes of the light emitting sub-parts 121 are the same. The areas occupied by the light emitting sub-parts 121 are equal.

[0108] In some examples, as shown in FIG. 13, the light emitting sub-part 121 includes a plurality of light emitting elements 1211. The light emitting element 1211 is electrically connected to the back plate 11.

[0109] The arrangement mode of the plurality of light emitting elements 1211 can be various, which can be selected and arranged according to actual conditions, and the embodiment of the present disclosure does not limit this.

[0110] The number of light emitting elements 1211 included in each light emitting sub-part 121 can be equal or not equal. The arrangement mode of the plurality of light emitting elements 1211 in each light emitting sub-part 121 can be the same or different.

[0111] For example, the plurality of light emitting elements 1211 in each light emitting sub-part 121 are arranged in an array. In this way, the arrangement of the plurality of light emitting elements 1211 is facilitated, which is beneficial to reduce the design difficulty of the display assembly 10.

[0112] Each light emitting sub-part 121 includes a plurality of light emitting elements 1211 emitting light of the same color, which reduces the probability of adjacent light emitting elements 1211 emitting light of different colors, can alleviate or even avoid the color crosstalk problem caused by the red light emitting element, the blue light emitting element 1211 and the green light emitting element 1211 being adjacent in turn, and can avoid the light loss caused by the red light emitting element 1211, the blue light emitting element 1211 and the green light emitting element 1211 being designed in a laminated manner along the thickness direction thereof.

[0113] It can be understood that the structure of the light emitting element 1211 can be various, which can be selected and arranged according to actual conditions, and the embodiment of the present disclosure does not limit this.

[0114] In some examples, the light-emitting element 1211 described above includes a micro light-emitting diode (Micro LED) or an organic light-emitting device.

[0115] For example, the micro LED is connected to the pixel circuitry in the backplane 11. Alternatively, the micro LED is connected to the driver chip in the backplane 11.

[0116] There are various methods for fabricating the light-emitting part 121 of the micro light-emitting diode, and the method can be selected according to actual needs. The embodiments disclosed herein do not limit this method.

[0117] For example, the backplate 11 includes three regions: a first region corresponding to the first light-emitting sub-part 1201, a second region corresponding to the second light-emitting sub-part 1202, and a third region corresponding to the third light-emitting sub-part 1203. The micro-light-emitting diode (LED) includes an epitaxial structure consisting of a first semiconductor layer, a light-emitting layer, and a second semiconductor layer stacked sequentially. The light-emitting layer can be a multiple quantum well (MQW) layer. The material of the first semiconductor layer can be p-GaN (p-type gallium nitride). The material of the second semiconductor layer can be n-GaN (n-type gallium nitride). The GaN material here can also be InGaN (indium gallium nitride), AlGAInP (aluminum gallium indium phosphide), AlGaN (aluminum gallium nitride), etc. Using these materials allows for a higher photoelectric conversion efficiency and a narrower spectrum of emitted light in the formed LED, resulting in higher brightness, higher purity, and higher display quality for the display component 10.

[0118] In some examples, the fabrication method of the light-emitting sub-part 121 includes: fabricating a plurality of red micro-light-emitting diodes, a plurality of green micro-light-emitting diodes, and a plurality of blue micro-light-emitting diodes respectively. Then, the portion of the backplate 11 located in a first region is etched, and each red micro-light-emitting diode is bonded and connected to the first region to form a first light-emitting sub-part 1201. The portion of the backplate 11 located in a second region is etched, and each green micro-light-emitting diode is bonded and connected to the second region to form a second light-emitting sub-part 1202. The portion of the backplate 11 located in a third region is etched, and a plurality of blue micro-light-emitting diodes are bonded and connected to the third region to form a third light-emitting sub-part 1203.

[0119] In other examples, the fabrication method of the light-emitting sub-part 121 includes: forming a first micro-light-emitting diode group, a second micro-light-emitting diode group, and a third micro-light-emitting diode group, respectively. The first micro-light-emitting diode group includes multiple red micro-light-emitting diodes, the second micro-light-emitting diode group includes multiple green micro-light-emitting diodes, and the third micro-light-emitting diode group includes multiple blue micro-light-emitting diodes. The first micro-light-emitting diode group is bonded and connected to a first region to form the first light-emitting sub-part 1201. The second micro-light-emitting diode group is bonded and connected to a second region to form the second light-emitting sub-part 1202. The third micro-light-emitting diode group is bonded and connected to a third region to form the third light-emitting sub-part 1203.

[0120] Specifically, the above-mentioned method for forming the first micro-light-emitting diode group includes: forming a first semiconductor layer, sequentially forming a red light-emitting layer and a second semiconductor layer on the first semiconductor layer, and etching the stacked second semiconductor layer, red light-emitting layer, and first semiconductor layer to form the first micro-light-emitting diode group. The methods for forming the second micro-light-emitting diode group and the fabrication methods for the third micro-light-emitting diode group can refer to the above-mentioned method for fabricating the first micro-light-emitting diode group.

[0121] Compared to the size of a single micro-LED, the dimensions of each region of the backplate 11 are relatively large. By using the two fabrication methods described above to form the light-emitting sub-parts 121, the fabrication process of the micro-LEDs can be simplified, and the fabrication process of the light-emitting sub-parts 121 can be improved. This is beneficial to improving the resolution of the display component 10. Furthermore, each light-emitting sub-part 121 can be optimized separately, which facilitates the achievement of a higher photoelectric conversion rate and the acquisition of images with higher brightness and color purity, thereby improving the display quality of the display component 10.

[0122] In some other examples, the fabrication method of the light-emitting portion 121 includes: forming a first semiconductor layer; sequentially forming a light-emitting layer and a second semiconductor layer on the first semiconductor layer, wherein the light-emitting layer can emit blue light; bonding the stacked first semiconductor layer, light-emitting layer, and second semiconductor layer to a backplate 11; etching the first semiconductor layer, light-emitting layer, and second semiconductor layer; and forming a first color-transfer layer on the first semiconductor layer, light-emitting layer, and second semiconductor layer corresponding to the first region, wherein the first color-transfer layer converts the blue light emitted by the light-emitting layer into red light. A second color-transfer layer is formed on the first semiconductor layer, light-emitting layer, and second semiconductor layer corresponding to the second region, wherein the second color-transfer layer converts the blue light emitted by the light-emitting layer into green light. It is understood that the light-emitting layer can also be made of a material that emits violet light. In this case, color-transfer layers need to be formed in the first region, the second region, and the third region respectively to convert violet light into red light, green light, and blue light, respectively.

[0123] The light-emitting part 121 is formed by the above-described preparation method. Since each region of the back plate 11 is relatively large in size compared to a single micro light-emitting diode, the preparation difficulty of the color transfer layer can be reduced during the preparation process, crosstalk between the light emitted by different color transfer layers can be avoided, and the display component 10 can also be guaranteed to have a high resolution.

[0124] For example, the organic light-emitting device described above can be connected to the pixel circuit in the backplane 11.

[0125] There are various methods for preparing the light-emitting sub-part 121 containing the organic light-emitting device, and the method can be selected according to actual needs. The embodiments disclosed herein do not limit this method.

[0126] For example, the method for fabricating the light-emitting sub-part 121 includes: depositing red light-emitting material in a first region using an open mask vapor deposition process to form a plurality of red organic light-emitting devices, the plurality of red organic light-emitting devices constituting the first light-emitting sub-part 121; depositing green light-emitting material in a second region to form a plurality of green organic light-emitting devices, the plurality of green organic light-emitting devices constituting the second light-emitting sub-part 121; and depositing blue light-emitting material in a third region to form a plurality of blue organic light-emitting devices, the plurality of blue organic light-emitting devices constituting the third light-emitting sub-part 121.

[0127] The organic light-emitting device fabricated using the above method can achieve a high resolution of display component 10, reaching over 1000 PPI (pixels per inch), without being limited by the resolution constraints imposed by the use of fine metal masks in related technologies. Furthermore, each light-emitting sub-unit 121 can be optimized individually, eliminating the need for color conversion layers, color filters, etc., thus reducing light emission losses of the light-emitting elements 1211. This results in better color saturation, brightness, and electro-optical conversion efficiency, as well as higher color purity and color gamut, enabling display component 10 to achieve superior display performance.

[0128] In some examples, as shown in Figures 12 and 14, the light-emitting part 12 further includes a light-shielding layer 122 located between two adjacent light-emitting sub-parts 121.

[0129] For example, the light-shielding layer 122 can be a black matrix (BM) to block light.

[0130] The black matrix is ​​used to avoid crosstalk between light emitted from two adjacent light-emitting sub-units 121, which helps to improve the display quality of the display component 10.

[0131] For example, along the first direction A, the size of the light-shielding layer 122 can range from the micrometer level to the millimeter level.

[0132] As exemplarily shown in FIG15, the display assembly 10 further includes a cover plate 14 located between the light-emitting part 12 and the light guide member 13. The orthographic projection of the light-emitting part 12 on the back plate 11 is located within the orthographic projection range of the cover plate 14 on the back plate 11.

[0133] The cover plate 14 is used to protect the light-emitting part 12 and can alleviate crosstalk between the light-emitting sub-parts 121.

[0134] For example, the material of cover plate 14 can be glass.

[0135] In some examples, as shown in Figure 15, the light guide 13 includes a plurality of first prisms 131 arranged sequentially along a first direction A.

[0136] As shown in Figures 16 and 17, the first prism 131 includes a first surface 131S and a filter film 131M. The filter film 131M covers at least a portion of the first surface 131S.

[0137] For example, as shown in Figure 17, the filter film 131M covers a portion of the first surface 131S. As also shown in Figure 16, the filter film 131M covers the first surface 131S.

[0138] As shown in Figure 16, the angle α between the first surface 131S and the positive direction of the first direction is an acute angle. As shown in Figure 15, the positive direction of the first direction A can be the direction of the first direction A to the left along the paper.

[0139] For example, the filter film 131M can be a film layer with uniform thickness. Thus, the angle between the filter film 131M and the positive direction of the first direction is equal to the angle between the first surface 131S and the positive direction of the first direction. Since this angle is acute, the light incident on the filter film 131M can be reflected by the filter film 131M and exit approximately in the positive direction of the first direction A.

[0140] For example, the angle α between the filter film 131M and the positive direction of the first direction can be 35°, 40°, 45°, 50°, 55° or 60°.

[0141] Along the thickness direction of the back plate 11, the filter films 131M of the plurality of first prisms 131 respectively cover the plurality of light-emitting sub-parts 121. For example, the filter film 131M of one first prism 131 covers one light-emitting sub-part 121.

[0142] As shown in Figure 18, the filter film 131M is configured to reflect the light emitted by the light-emitting sub-parts 121 it covers and incident on the filter film 131M, and transmit the light emitted by other light-emitting sub-parts 121 and incident on the filter film 131M.

[0143] The first prism 131 can be referred to as a dichroic reflector.

[0144] For example, the plurality of filter films 131M include a first filter film 1311M, a second filter film 1312M and a third filter film 1313M arranged sequentially along the first direction A.

[0145] Specifically, the first filter film 1311M covers the first light-emitting part 1201, reflects the red light emitted by the first light-emitting part 1201 and incident on the first filter film 1311M, transmits the green light emitted by the second light-emitting part 1202 and incident on the first filter film 1311M, and transmits the blue light emitted by the third light-emitting part 1203 and incident on the first filter film 1311M.

[0146] The second filter film 1312M covers the second light-emitting part 1202, reflects the green light emitted by the second light-emitting part 1202 and incident on the second filter film 1312M, transmits the red light emitted by the first light-emitting part 1201 and incident on the second filter film 1312M, and transmits the blue light emitted by the third light-emitting part 1203 and incident on the second filter film 1312M.

[0147] The third filter film 1313M covers the third light-emitting part 1203, reflects the blue light emitted by the third light-emitting part 1203 and incident on the third filter film 1313M, transmits the red light emitted by the first light-emitting part 1201 and incident on the third filter film 1313M, and transmits the green light emitted by the second light-emitting part 1202 and incident on the third filter film 1313M.

[0148] For example, the light-emitting part 12 emits light in a direction that is generally along the thickness direction of the back plate 11 (i.e., the third direction Z), and is incident on the filter film 131M. After being reflected by the filter film 131M, the light is emitted in a direction that is generally in the positive direction of the first direction.

[0149] Referring to Figures 19 to 21, taking an example where the angle between the filter film 131M and the positive direction of the first direction is 45°, the light emitted by the light-emitting part 12 is incident on the first prism 131 along the third direction C. The incident angle of this light is 45°. According to the law of reflection, after being reflected by the filter film 131M in the first prism 131, the reflection angle is 45°, and the reflected light is emitted along the positive direction of the first direction A.

[0150] Therefore, the arrangement of the first prism 131 can change the exit direction of the light incident on the filter film 131M, thereby reducing the size of the display component 10 in the third direction C, which in turn helps to reduce the volume of the display component 10 and the display device 1.

[0151] In some examples, as shown in Figure 15, the light rays emitted from multiple filter films 131M are coaxial.

[0152] Understandably, in Figure 15, the dashed lines with arrows represent the exit path of the light rays.

[0153] This allows the light emitted from different filter films 131M to converge more effectively, preventing the light emitted from different filter films 131M from not overlapping or being too far apart, which would result in poor image quality formed by the light emitted from the display component 10.

[0154] For example, as shown in FIG15, the orthographic projections of each first prism 131 along the first direction A coincide. As a result, the dimensions of each first prism 131 along the third direction C are equal, which facilitates the bonding of multiple first prisms 131 together, which helps to reduce the volume of the light guide 13 and realize the miniaturization and lightweight design of the display component 10 and the display device 1.

[0155] For example, the planes on which the filter films 131M of each first prism 131 are located are parallel to each other.

[0156] This makes the light rays emitted from each of the first prisms 131 more concentrated, which helps to improve the display quality of the image.

[0157] For example, the plurality of first prisms 131 include: a first sub-prism 1301, a second sub-prism 1302, and a third sub-prism 1303 arranged sequentially along a first direction A. The second sub-prism 1302 and the third sub-prism 1303 may have the same shape and the same size.

[0158] The second sub-mirror 1302 further includes a second surface disposed opposite to its first surface 131S. The second surface is parallel to the first surface 131S. The third sub-mirror 1303 further includes a third surface disposed opposite to its first surface 131S, and the third surface is parallel to its first surface 131S. Thus, the first surface 131S of the first sub-mirror 1301 and its filter film 131M can be bonded to the second surface of the second sub-mirror 1302 to achieve the connection between the first sub-mirror 1301 and the second sub-mirror 1302, and the first surface 131S of the second sub-mirror 1302 and its filter film 131M can be bonded to the third surface of the third sub-mirror 1303 to achieve the connection between the second sub-mirror 1302 and the third sub-mirror 1303. This connects the first sub-mirror 1301, the second sub-mirror 1302, and the third sub-mirror 1303 into a whole, which is beneficial to reducing the size of the display assembly 10 and the display device 1.

[0159] In some examples, as shown in Figure 15, the light guide 13 further includes a second prism 132 located on the light-emitting side of the plurality of first prisms 131.

[0160] For example, the orthographic projection of the second prism 132 along the first direction A coincides with the orthographic projection of any one of the first prisms 131 along the first direction A. The second prism 132 includes a fourth surface, which is parallel to the first surface 131S of the third sub-mirror 1303. Thus, the fourth surface of the second prism 132 can be bonded to the first surface 131S and the filter film 131M of the third sub-mirror 1303, thereby connecting each of the first prisms 131 and the second prism 132 into one unit, which helps to reduce the size of the display assembly 10 and the display device 1.

[0161] For example, the first sub-mirror 1301 further includes a fifth surface, which forms a 90° angle with the first direction A and is parallel to the third direction C. The second prism 132 further includes a sixth surface, which is parallel to the fifth surface. Thus, the projection shape of each of the first prisms 131 and the second prism 132 along the second direction B is rectangular or approximately rectangular, which is beneficial for reducing the size of the display assembly 10 and the display device 1.

[0162] Light rays emitted from each of the first prisms 131 enter the second prism 132 along the first direction A, continue to propagate within the second prism 132 along the first direction A, and exit from the sixth surface of the second prism 132.

[0163] For example, as shown in FIG15, the size of the second prism 132 along the first direction A is larger than the size of the first prism 131 along the first direction A.

[0164] For example, the dimension of the second prism 132 along the first direction A is much larger than the dimension of the first prism 131 along the first direction A. The dimension of the second prism 132 along the first direction A is greater than the sum of the dimensions of the multiple first prisms 131 along the first direction A.

[0165] Therefore, the light emitted from each light-emitting sub-unit 121 has a shorter optical path (or emission path) within each first prism 131 and a longer optical path within the second prism 132. This results in a smaller optical path difference between the different colors of light emitted from each light-emitting sub-unit 121, which means that the optical path difference between red, green, and blue light is smaller. Consequently, the equivalent object distance of the three colors of light relative to the light-emitting surface of the light guide 13 tends to be equal, which helps to ensure that the image distance of the three colors of light is equal. This, in turn, helps to ensure the consistency of the field of view angle after the three colors of light are emitted from the display component 10, which helps to improve the display quality of the display component 10 and the display device 1, and improves the user's user experience.

[0166] In some examples, as shown in Figure 15, the light guide 13 also includes a lens group 133.

[0167] The lens group 133 is located on the light-emitting side of the plurality of first prisms 131, and the side surface of the lens group 133 away from the plurality of first prisms 131 constitutes the light-emitting surface of the light guide 13.

[0168] When the light guide 13 also includes a second prism 132, the lens group 133 is located on the light-emitting side of the second prism 132. Thus, light rays emitted from the first prism 131 and the second prism 132 can enter the lens group 133.

[0169] The lens group 133 is configured to convert the light rays emitted from the plurality of first prisms 131 and incident on the lens group 133 into light rays with equal image distances before they are emitted.

[0170] This allows the three-color light rays (red, green, and blue) to be combined, enabling the display component 10 to emit colored light rays to form a color image.

[0171] In some examples, as shown in Figure 15, the lens group 133 is coaxial with multiple filters 131M.

[0172] This ensures that the light emitted from the filter film 131M to the lens group 133 is more focused, that the light emitted from the lens group 133 is brighter, and that the image quality of the three-color light composite is better, thereby improving the image quality of the display component 10 and the display device 1 and thus improving the user experience.

[0173] In some examples, as shown in Figure 15, lens group 133 includes diffractive lens 1331.

[0174] For example, the diffraction lens 1331 can be an aberration-free lens.

[0175] As shown in Figure 23, the diffraction lens 1331 has at least one microstructure 1332, for example, the microstructure 1332 can be a metasurface structure with size parameters at the nanometer level.

[0176] The shapes of the multiple microstructures 1332 can be the same or different.

[0177] For example, multiple microstructures 1332 are configured to adjust the focal length of the diffraction lens 1331 and adjust the phase of the light incident on the microstructure 1332, so that the light emitted through the diffraction lens 1331 is adjusted to light with equal image distance.

[0178] Therefore, the three-color light rays emitted through the diffraction lens 1331 can be combined to form a color image, and the display quality of the color image is better, avoiding the undesirable phenomenon that the images formed by different colors of light rays cannot be completely superimposed due to the unequal image distances of the light rays carrying different images.

[0179] There are various design methods for the multiple microstructures 1332 on the diffraction lens 1331, and the embodiments disclosed herein do not limit this method.

[0180] In some examples, according to the lens imaging formula (also known as the Gaussian imaging formula, see Formula 1), the object distances of the rays emitted by each emitting sub-unit 121 are different. In order to achieve that the red ray (containing red image information), green ray (containing green image information), and blue ray (containing blue image information) are imaged on the same image plane (i.e., have equal image distances) after being processed by the diffraction lens 1331, the focal lengths of the diffraction lens 1331 for the red, green, and blue rays need to be designed to be different. The focal lengths of the diffraction lens 1331 for the red, green, and blue rays can be calculated with reference to Formulas 2, 3, and 4 below.

[0181] In Formula 1, u is the object distance, v is the image distance, and f is the focal length. Formulas 2, 3, and 4 are variations of Formula 1. R Let u be the object distance of the red ray. G Let u be the object distance of the green ray. B f is the object distance of the blue light ray. R f is the focal length of lens group 133 for red light. G f is the focal length of lens group 133 for green light. B Let x and y be the focal length of lens group 133 for blue light. In Formula 5, x and y are the coordinates of a certain position on diffraction lens 1331, with the center of diffraction lens 1331 as the center point. Let λ represent the phase of microstructure 1332 at coordinates (x, y), λ be the wavelength of the light, and f be the focal length. Formula 5 applies to the phase calculation of the aforementioned aberration-free lens.

[0182] It is understandable that Figure 24 is a schematic diagram of phase calculation for a diffractive lens, and the specific calculation can be referred to Formula 5 above. In Figure 24, DM is a virtual surface formed by a certain phase point of diffractive lens 1331, F is the focal point of diffractive lens 1331, and O is the origin of coordinates of diffractive lens 1331.

[0183] Since the image distance v is a fixed value (which can be determined based on the distance between the imaging component 20 and the lens group 133), the object distance u can be measured or calculated based on the distance between the light-emitting part 12 in the display component 10 and the lens group 133. Therefore, the focal length f can be obtained according to Formula 2, Formula 3, and Formula 4. R f G f BThe value of φ is then calculated according to Formula 5, which gives the phase φ of the three colors of light at any position on the diffraction lens 1331. L (x, y). Next, using electromagnetic wave simulation software, the microstructure database (see Figure 25) is searched for the phase φ described above. L Microstructures 1332 with the same or similar coordinates (x, y) are designed at their corresponding coordinate positions (x, y), and multiple microstructures 1332 constitute a diffraction lens 1331.

[0184] In some examples, the refractive index of the material with microstructure 1332 is greater than or equal to 1.9.

[0185] For example, the refractive index of the material with microstructure 1332 can be 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or above 3.0.

[0186] The high refractive index of microstructure 1332 allows for the fabrication of microstructures with a low aspect ratio (the aspect ratio here can be the ratio of the height H of microstructure 1332 to the first dimension L, as mentioned below) while achieving phase adjustment. This reduces the fabrication difficulty of microstructure 1332, effectively improves the yield of light guide fabrication, and lowers the fabrication cost of light guides. Furthermore, the high refractive index of microstructure 1332 also makes the design and fabrication of display component 10 easier, ensuring that display component 10 has a wider light emission angle and a wider light emission spectrum, while reducing light loss and thus improving the brightness of display component 10 and display device 1.

[0187] For example, the material of microstructure 1332 may include: titanium oxide (TiOx), niobium oxide (Nb2Ox), silicon nitride (SiNx), gallium nitride (GaN), silicon carbide (SiC), or a high-refractive-index resin, etc.

[0188] The aforementioned material has a low absorption rate of visible light. Therefore, the loss of light during the process of passing through the microstructure 1332 can be further reduced, thereby improving the light output brightness of the display component 10 and the display device 1.

[0189] In some examples, as shown in Figures 27, 28, 30, and 31, the top view of the microstructure 1332 on the plane of the backplate 11 is an axisymmetric figure.

[0190] Therefore, the phase of the light can be adjusted better, so that the image distances of light of different wavelengths are equal after they are emitted.

[0191] In some examples, as shown in Figures 26 to 31, the diffraction lens 1331 also has a substrate 1333, on which a plurality of microstructures 1332 are located.

[0192] For example, the substrate 1333 can be made of glass, sapphire, quartz, resin, etc. Therefore, using these materials as substrates can reduce the absorption of light by the substrate 1333 and reduce light loss.

[0193] For example, the microstructure 1332 protrudes relative to the substrate 1333. This facilitates the adjustment of the phase of light by the microstructure 1332.

[0194] For example, microstructure 1332 is closer to the second prism 132 than substrate 1333. Similarly, substrate 1333 is closer to the second prism 132 than microstructure 1332.

[0195] It is understood that the shape and size parameters of the microstructure 1332 can have various combinations and can be selected and set according to actual needs. The embodiments disclosed herein do not limit this. In addition, changing the shape, size, and arrangement period of multiple microstructures 1332 can make the microstructure 1332 have different effects on the phase regulation of light of different wavelengths.

[0196] In some examples, the shape of microstructure 1332 includes columnar or cylindrical; or the diffractive lens includes a microstructure in the shape of a mesh or a combination of multiple columnar structures located within multiple mesh openings.

[0197] For example, as shown in Figures 26, 27(a), 27(b), and 27(c), the shape of the microstructure 1332 can be a square prism, a cylinder, a regular hexagonal prism, etc. As shown in Figure 27(d), the shape of the microstructure 1332 can also be a combination of two square prisms, and the top view of the two square prisms is a cross shape.

[0198] As shown in Figures 28(a) and 28(b), the cylindrical shape of microstructure 1332 means that its top view is a ring-shaped structure, and the shape of the inner ring can be the same as or different from that of the outer ring. For example, the outer ring can be rectangular, and the inner ring can be rectangular, circular, hexagonal, or cross-shaped, etc. Alternatively, the outer ring can be circular, and the inner ring can also be circular, etc.

[0199] As shown in Figures 29, 30(a), 30(b), 30(c), and 30(d), the diffraction lens includes a microstructure with a mesh-like shape. The orthographic projection of the microstructure 1332 onto the substrate 1333 also has a mesh-like shape. This mesh structure has pores, the size of which is at the nanometer level. The shape of the pores can be circular, square, hexagonal, or cross-shaped, etc.

[0200] As shown in Figures 31(a) and 31(b), the columnar shape of the microstructure 1332 located within the mesh refers to the fact that the microstructure 1332 includes a first sub-part 1332q and multiple second parts 1332r. The orthographic projection of the first part 1332q onto the substrate 1333 is a mesh structure with mesh openings, the shape of which can be circular or square. Each second part 1332r is located at the center of its respective mesh opening. The shape of the second part 1332r can be columnar, such as a cylinder or a regular square prism.

[0201] It is understandable that the shapes of multiple microstructures 1332 can be the same or different.

[0202] In some examples, multiple microstructures 1332 have equal or approximately equal heights.

[0203] For example, when the shape of the microstructure 1332 is a columnar combination located within the mesh, the equal height of the multiple microstructures 1332 means that the height of the first sub-part 1332q and the second sub-part 1332r are equal.

[0204] Therefore, multiple microstructures 1332 or intermediate microstructures of the same height can be formed in a single fabrication process (such as the exposure etching process, nanoimprinting process, or nanoimprinting process and etching process mentioned below), which helps to reduce the fabrication difficulty of microstructure 1332.

[0205] For example, the height of microstructure 1332 ranges from 300 nm to 1500 nm.

[0206] For example, the height range of microstructure 1332 may include: 300nm~600nm, 700nm~1000nm, 1100nm~1200nm, 300nm~1200nm or 1000nm~1500nm.

[0207] For example, the height of microstructure 1332 can be 300nm, 600nm, 800nm, 1100nm or 1500nm.

[0208] In some examples, as shown in Figure 23, multiple microstructures are arranged in an array of 1332.

[0209] The arrangement period P of multiple microstructures 1332 is 200nm to 500nm, the size of microstructure 1332 in the first direction A is the first size L, and the ratio of the height H of microstructure 1332 to the first size L is in the range of 3:1 to 20:1.

[0210] For example, the arrangement period P here refers to the spacing between the centers of two adjacent microstructures 1332.

[0211] For example, the arrangement period of the multiple microstructures 1332 can be 200nm~300nm, 200nm~400nm, 350nm~450nm, 350nm~500nm or 400nm~500nm.

[0212] For example, the arrangement period of multiple microstructures 1332 can be 200nm, 300nm, 350nm, 400nm or 500nm.

[0213] When the microstructure 1332 is mesh-like, the size of the microstructure 1332 in the first direction is the first size L, which is the size of its mesh openings in the first direction.

[0214] When the microstructure 1332 is a columnar combination shape located within the mesh, the size of the microstructure 1332 in the first direction is the first dimension L, and the size of the mesh in the first direction is L1, or the size of its columnar second sub-part 1332r in the first direction is L2.

[0215] For example, the dimension of the microstructure 1332 in the first direction is the first dimension L, and the ratio of the height H of the microstructure 1332 to the first dimension L can be in the range of 3:1 to 7:1, 3:1 to 10:1, 5:1 to 10:1, 10:1 to 15:1 or 5:1 to 20:1.

[0216] For example, the dimension of the microstructure 1332 in the first direction is the first dimension L, and the ratio of the height H of the microstructure 1332 to the first dimension L can be 3:1, 7:1, 10:1, 15:1 or 20:1.

[0217] By setting the first size, height, and period of the microstructure 1332 within the above range, the microstructure 1332 can adjust the phase of light of different wavelengths, ensuring that the image distance of the light emitted from the diffraction lens 1331 is equal.

[0218] There are various methods for preparing the diffraction lens 1331, and the method can be selected according to actual needs. The embodiments disclosed herein do not limit this method.

[0219] In some examples, the fabrication method of the diffraction lens 1331 includes: forming a microfilm on a substrate 1333, and forming multiple microstructures 1332 using an exposure process and an etching process.

[0220] In other examples, the fabrication method of the diffraction lens 1331 includes: forming a microfilm on a substrate 1333 and forming multiple microstructures 1332 using a nanoimprint lithography process. Alternatively, forming a microfilm on a substrate 1333 and forming multiple microstructures 1332 using a nanoimprint lithography and etching process.

[0221] The above preparation method can simplify the preparation process of the diffraction lens 1331 and help reduce the preparation cost of the diffraction lens.

[0222] In some examples, as shown in Figure 22, lens group 133 further includes at least one refractive lens 1334. At least one refractive lens 1334 is coaxial with diffractive lens 1331.

[0223] For example, lens group 133 includes a diffractive lens 1331 and one or more refractive lenses 1334.

[0224] For example, multiple refracting lenses 1334 can be located on one side of the diffraction lens 1331. Alternatively, multiple refracting lenses 1334 can be located on opposite sides of the diffraction lens 1331.

[0225] For example, the refracting lens 1334 can work in conjunction with the diffraction lens 1331 to adjust the phase of the light rays and adjust the focal length of the lens group 133 to ensure that the light rays emitted from the lens group 133 are light rays with equal image distances, thereby improving the user experience.

[0226] When the lens group 133 includes multiple refracting lenses 1334 and diffractive lenses 1331, the focal length of the lens group 133 for different colors of light can be calculated using formulas six, seven, and eight.

[0227] Among them, f R ' is the focal length of the diffractive lens 1331 for red light, f G ' is the focal length of the diffractive lens 1331 for green light, f B 'fi' is the focal length of the diffractive lens 1331 for blue light, fi is the focal length of the i-th refracting lens 1334, and f R f is the focal length of lens group 133 for red light. G f is the focal length of lens group 133 for green light. B This is the focal length of lens group 133 for blue light.

[0228] In other examples, as shown in Figure 32, lens group 133 includes holographic lens 1335.

[0229] For example, the holographic lens 1335 includes a carrier substrate and a functional film located on one side of the substrate.

[0230] The substrate material can be glass or quartz.

[0231] For example, the materials for functional films include: silver halide dry plates, dichromate gelatin, holographic polymer dispersed liquid crystal (HPDLC), holographic polymers, etc.

[0232] For example, the thickness of the functional membrane ranges from 1 μm to 50 μm.

[0233] Understandably, the holographic lens 1335 can adjust the phase of the light incident on it, and adjust the light emitted from the holographic lens 1335 to light with equal image distance.

[0234] There are various methods for preparing the holographic lens 1335, and the embodiments disclosed herein are not limited to any particular method.

[0235] For example, the fabrication method of the holographic lens 1335 includes: providing a carrier substrate, coating a functional film material on the carrier substrate to form a holographic plate 1335'. ​​A laser emitter 31, a laser beam expander 32, a first lens 33, a beam splitter 34, a second lens 35, a first reflector 36, a second reflector 37, etc., are provided, and the optical path is designed as shown in Figure 33. The focal length of the second lens 35 is calculated according to Formulas 2, 3, and 4 above. The laser emitter 31 provides lasers with wavelengths of red, green, and blue light respectively to expose the holographic plate 1335', ​​recording the information of the second lens 35 on the functional film material to form the holographic lens 1335.

[0236] Because the material of the functional film has Bogle diffraction properties, the holographic lens 1335 can respond within a narrow spectral range, thereby avoiding crosstalk between different colors emitted after passing through the holographic lens and improving the color gamut of the display component 10 and the display device 1.

[0237] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A display component, comprising: Back panel; The light-emitting part is located on one side of the back plate and is electrically connected to the back plate; The light-emitting part includes: a plurality of light-emitting sub-parts; the plurality of light-emitting parts are arranged sequentially along a first direction; the first direction is perpendicular to the thickness direction of the back plate; each light-emitting sub-part is configured to emit light of a certain color; and, A light guide is located on the side of the light-emitting part away from the back plate; the light guide covers the light-emitting part along the thickness direction of the back plate; The light guide is configured to convert light emitted by the plurality of light-emitting sub-parts and incident on the light guide into light rays that are coaxial and have equal image moments, and then emit them.

2. The display component according to claim 1, wherein, The light-emitting sub-section includes multiple light-emitting elements arranged in an array; the light-emitting elements are electrically connected to the back plate.

3. The display component according to claim 2, wherein, The light-emitting element includes a micro light-emitting diode or an organic light-emitting device.

4. The display component according to claim 1, wherein, The light-emitting part further includes a light-shielding layer located between two adjacent light-emitting sub-parts.

5. The display component according to any one of claims 1 to 4, wherein, The light guide includes: a plurality of first prisms arranged sequentially along the first direction; The first prism includes: a first surface and a filter film; the filter film covers at least a portion of the first surface; The angle between the first surface and the positive direction of the first direction is an acute angle; Along the thickness direction of the back plate, the filter films of the plurality of first prisms respectively cover the plurality of light-emitting sub-parts; The filter film is configured to reflect light emitted by the light-emitting portion it covers and incident on the filter film, and to transmit light emitted by other light-emitting portions and incident on the filter film.

6. The display component according to claim 5, wherein, The light rays emitted from the multiple filter films are coaxial.

7. The display component according to claim 5 or 6, wherein, The orthographic projections of each of the first prisms along the first direction coincide; the planes containing the filter films of each of the first prisms are parallel to each other.

8. The display component according to any one of claims 5 to 7, wherein, The light guide further includes: a second prism located on the light-emitting side of the plurality of first prisms; The dimension of the second prism along the first direction is greater than the dimension of the first prism along the first direction.

9. The display component according to any one of claims 5 to 8, wherein, The light guide also includes: a lens assembly; The lens group is located on the light-emitting side of the plurality of first prisms, and the lens group is located away from the plurality of first prisms. The side surface constitutes the light-emitting surface of the light guide; The lens group is configured to convert light rays emitted from the plurality of first prisms and incident on the lens group into light rays with equal image distances before they exit.

10. The display component according to claim 9, wherein, The lens group and the plurality of filter films share the same optical axis.

11. The display component according to claim 9 or 10, wherein, The lens group includes diffractive lenses; The diffractive lens has at least one microstructure; the microstructure is configured to adjust the focal length of the diffractive lens and the phase of the light incident on the microstructure, thereby adjusting the light emitted from the diffractive lens to light with equal image distances.

12. The display component according to claim 11, wherein, The refractive index of the material of the microstructure is greater than or equal to 1.

9.

13. The display component according to claim 11 or 12, wherein, The shape of the microstructure in the top view of the plane where the back plate is located is an axisymmetric figure.

14. The display component according to any one of claims 11 to 13, wherein, The diffraction lens also has a substrate on which the plurality of microstructures are located; the microstructures protrude relative to the substrate.

15. The display component according to claim 14, wherein, The microstructure may be columnar or cylindrical; or the diffractive lens may include a microstructure, the shape of which may be a mesh or a combination of multiple columnar structures located within multiple mesh openings.

16. The display component according to claim 15, wherein, The heights of the multiple microstructures are equal or approximately equal.

17. The display component according to any one of claims 11 to 16, wherein, The multiple microstructure arrays are arranged; The arrangement period of the plurality of microstructures is 200nm to 500nm, the size of the microstructure in the first direction is the first size, and the ratio of the height of the microstructure to the first size is in the range of 3:1 to 20:

1.

18. The display component according to any one of claims 11 to 17, wherein, The lens group further includes at least one refractive lens; the at least one refractive lens and the diffractive lens are coaxial.

19. The display component according to claim 9 or 10, wherein, The lens group includes a holographic lens.

20. A display device comprising a display component according to any one of claims 1 to 19, and an imaging component located on the light-emitting side of the display component.

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