Display device

Abstract

The present invention discloses a display device, which relates to the field of display technology and includes a substrate, a light-emitting element arranged on one side of the substrate, a light transmission structure arranged on the side of the light-emitting element away from the substrate, and a plurality of light-sensitive units arranged on the side of the substrate away from the light-emitting element; the light transmission structure includes a first light guide and a reflector arranged in a direction parallel to the plane where the substrate is located, the reflector is located on both sides of the first light guide, and the orthographic projection of the first light guide on the substrate is located between two adjacent light-emitting elements; wherein the refractive index of the first light guide is n1, and the refractive index of the reflector is n0, wherein n1≠n0. Due to the reflection effect of the reflector, the first light guide forms a light-guiding channel, and light will be able to be transmitted through the first light guide to between two adjacent light-emitting elements, and then can be transmitted to the light-sensitive unit. In this way, it is beneficial to increase the amount of light transmitted to the light-sensitive unit and improve the light-sensitive performance of the product.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more particularly, to a display device. Background Art

[0002] With the increasing popularity of mobile display products, information security has drawn significant attention. Fingerprints are unique, innate, and unchanging features that distinguish one person from another. They consist of a series of ridges and valleys on the surface of the skin at the fingertips. These details, such as bifurcations, ridge terminations, arches, tented arches, left-handed, right-handed, spiral, or double spirals, determine the uniqueness of the fingerprint pattern. Due to the uniqueness, difficulty in replicating, and security of fingerprints, fingerprint recognition technology has been widely adopted in mobile display products in recent years as a means of identity authentication and access control, significantly improving the security and ease of use of mobile display products.

[0003] Optical fingerprint recognition uses the principles of light refraction and reflection. By placing the finger on a optical lens, the difference in reflection of light on the valleys and ridges on the finger surface is used to differentiate the fingerprint information received by the sensing device and form a fingerprint image. The working principle is relatively simple, but the sensing device used in the fingerprint recognition process is easily affected by optical noise, making it difficult to improve the accuracy of fingerprint recognition.

[0004] Therefore, how to improve the accuracy of light fingerprint recognition is one of the technical problems that need to be solved urgently in this field. Summary of the Invention

[0005] In view of this, the present invention provides a display device, which aims to improve the photosensitivity of a product, thereby improving the fingerprint recognition accuracy of a product with a fingerprint recognition function.

[0006] In a first aspect, the present application provides a display device, comprising a substrate, a light-emitting element disposed on one side of the substrate, a light-transmitting structure disposed on a side of the light-emitting element facing away from the substrate, and a plurality of light-sensing units disposed on a side of the substrate facing away from the light-emitting element;

[0007] The light transmission structure includes a first light guide and a reflector arranged in a direction parallel to the plane of the substrate, the reflector is located on both sides of the first light guide, and the orthographic projection of the first light guide on the substrate is located between two adjacent light-emitting elements; wherein the refractive index of the first light guide is n1, and the refractive index of the reflector is n0, wherein n1≠n0.

[0008] Compared with the prior art, the display device provided by the present invention achieves at least the following beneficial effects:

[0009] In the display device provided by the present invention, a light transmission structure is provided on the side of the light-emitting element facing away from the substrate, and a plurality of light-sensing units are provided on the side of the substrate facing away from the light-emitting element, wherein the light transmission structure includes a first light guide and a reflector provided on both sides of the first light guide, and the first light guide is located between two adjacent light-emitting elements along a direction perpendicular to the substrate. The present invention sets the refractive index of the first light guide in the light transmission structure to be different from the refractive index of the reflector, and when the light is transmitted to the interface between the first light guide and the reflector, reflection will occur, and the first light guide will form a light guide channel, and the light will be able to be transmitted through the first light guide to between two adjacent light-emitting elements, and then be able to be transmitted to the light-sensing unit. In this way, it is beneficial to increase the amount of light transmitted to the light-sensing unit and improve the light-sensing performance of the product. When the light-sensing unit provided on the side of the substrate facing away from the light-emitting element is a fingerprint recognition unit, the above-mentioned light guide channel can transmit more light to the fingerprint recognition unit, which is beneficial to improve the fingerprint recognition accuracy of the product.

[0010] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0011] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0013] Figure 1 FIG2 is a top view of a display device provided by an embodiment of the present invention;

[0014] Figure 2 Shown Figure 1 A partially enlarged schematic diagram of a display area in a display device;

[0015] Figure 3 Shown Figure 2 An AA cross-sectional view of the display device;

[0016] Figure 4 FIG1 is another partial enlarged schematic diagram of the display area of the display device 1;

[0017] Figure 5 Shown Figure 4 A BB cross-sectional view of the display device;

[0018] Figure 6 FIG1 is another partial enlarged schematic diagram of the display area of the display device 1;

[0019] Figure 7 Shown Figure 6 A CC cross-sectional view of a display device;

[0020] Figure 8 Shown Figure 1 Another partially enlarged schematic diagram of the display area of the display device;

[0021] Figure 9 Shown Figure 1 Another partially enlarged schematic diagram of the display area of the display device;

[0022] Figure 10 Shown Figure 1 Another partially enlarged schematic diagram of the display area of the display device;

[0023] Figure 11 Shown Figure 1 Another partially enlarged schematic diagram of the display area of the display device;

[0024] Figure 12 Shown Figure 1 Another partially enlarged schematic diagram of the display area of the display device;

[0025] Figure 13 FIG2 is a diagram showing a relative position relationship between a second light guide and a pixel unit in a display device provided by an embodiment of the present invention;

[0026] Figure 14 FIG2 is a top view of the relationship between the first light guide and the light sensing unit in the display device provided by an embodiment of the present invention;

[0027] Figure 15 Shown Figure 14 A DD cross-sectional view of the display device;

[0028] Figure 16 FIG. 1 is another schematic diagram of a film layer of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the present invention. Therefore, the present invention is intended to cover modifications and variations of the present invention that fall within the scope of the corresponding claims (technical solutions claimed for protection) and their equivalents. It should be noted that the embodiments provided in the embodiments of the present invention may be combined with each other unless there is any contradiction.

[0034] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] Figure 1 FIG. 1 is a top view of a display device provided by an embodiment of the present invention. Figure 2 Shown Figure 1 A partial enlarged schematic diagram of a display area in a display device, Figure 3 Shown Figure 2 An AA cross-sectional view of the display device, please refer to Figures 1 to 3 An embodiment of the present invention provides a display device 100, comprising a substrate 00, a light emitting element 10 disposed on one side of the substrate 00, a light transmission structure 60 disposed on a side of the light emitting element 10 facing away from the substrate 00, and a plurality of light sensing units 40 disposed on a side of the substrate 00 facing away from the light emitting element 10;

[0036] The optical transmission structure 60 includes a first light guide 21 and a reflector 30 arranged in a direction parallel to the plane of the substrate 00. The reflector 30 is located on both sides of the first light guide 21, and the orthographic projection of the first light guide 21 on the substrate 00 is located between two adjacent light-emitting elements 10; wherein, the refractive index of the first light guide 21 is n1, and the refractive index of the reflector 30 is n0, wherein n1≠n0.

[0037] It is understandable that Figure 1 The display device in the present invention is illustrated by taking a display device with a rectangular structure as an example, and the actual shape of the display device is not limited. In some other embodiments of the present invention, the display device can also be embodied in shapes other than rectangular, such as circular, elliptical or non-rectangular special-shaped structures. Figure 1 and Figure 2The light-emitting element 10 of the present invention is illustrated by taking the light-emitting element 10 with a rectangular structure as an example, and the actual shape of the light-emitting element 10 is not limited. In some other embodiments of the present invention, the light-emitting element 10 can also be embodied as other structures such as a circle or a diamond. Figure 1 The light-emitting elements 10 in the display device are only illustrated as being arranged in an array, and the actual arrangement of the light-emitting elements 10 is not limited. In other embodiments of the present invention, the light-emitting elements 10 may also be arranged in other feasible ways.

[0038] To clearly illustrate the present invention, the accompanying drawings illustrate only structures relevant to the present invention. Although not shown in the drawings, it is understood that to drive the light-emitting element 10 to emit light, the display device may further include multiple signal lines, such as gate lines, data lines, clock signal lines, etc., and may further include multiple drive circuits, such as a pixel drive circuit located in the display area and a gate drive circuit located in the non-display area.

[0039] For details, please refer to Figures 1 to 3 In the display device provided by the present invention, a light transmission structure 60 is provided on the side of the light-emitting element 10 facing away from the substrate 00, and a plurality of light-sensing units 40 are provided on the side of the substrate 00 facing away from the light-emitting element 10. Optionally, the light-sensing unit 40 is a fingerprint recognition unit or an infrared sensing unit having a light-sensing function. Taking the light-sensing unit 40 as an example of a fingerprint recognition unit, the touching subject presses on the screen of the display device. The finger has ridges and valleys. The ridges are in contact with the surface of the display screen, while the valleys are not in contact with the surface of the display screen. This causes the reflectivity of the light irradiated on the areas corresponding to the valleys and ridges of the fingerprint to be different, thereby causing the light-sensing unit 40 to receive different intensities of the reflected light formed at the position of the ridge and the reflected light formed at the position of the valley. Accordingly, the reflected light formed at the position of the ridge and the reflected light formed at the position of the valley F2 are converted into different photocurrents in the light-sensing unit 40. The ridges and valleys of the fingerprint can be identified based on the photocurrent. The current sizes of the plurality of light-sensing units 40 are integrated to identify the fingerprint information. In the related art, since the sensing devices used in the fingerprint recognition process are easily affected by optical noise, it is difficult to improve the accuracy of fingerprint recognition.

[0040] To this end, the present invention introduces a light transmission structure 60 into the display device, wherein the light transmission structure 60 includes a first light guide 21 and reflectors 30 disposed on both sides of the first light guide 21. The first light guide 21 is located between two adjacent light-emitting elements 10 in a direction perpendicular to the substrate 00. Assuming that the area in the display device where the light-emitting elements 10 are disposed is an opening area, and the area where the light-emitting elements 10 are not disposed (for example, the area between two adjacent light-emitting elements 10) is a non-opening area, optionally, the first light guide 21 and the reflector 30 in the light transmission structure 60 of the present invention are both located in the non-opening area to avoid blocking the light emitted by the light-emitting elements 10 and affecting the aperture ratio of the display device. Furthermore, the present invention sets the refractive index of the first light guide 21 in the light transmission structure 60 to be different from the refractive index of the reflector 30. When light is transmitted to the interface between the first light guide 21 and the reflector 30, reflection will occur. The first light guide 21 will form a light guide channel. The light will be able to be transmitted through the first light guide 21 to the area between two adjacent light-emitting elements 10, and then be able to be transmitted from this area to the photosensitive unit 40 located on the side of the substrate 00 away from the light-emitting element 10. The setting of the above-mentioned light guide channel is conducive to increasing the amount of light transmitted to the photosensitive unit 40. When the amount of light received by the photosensitive unit 40 is increased, it is conducive to improving the light-sensing performance of the product. When the photosensitive unit 40 set on the side of the substrate 00 away from the light-emitting element 10 is a fingerprint recognition unit, the above-mentioned light guide channel can transmit more light to the fingerprint recognition unit, thereby helping to improve the fingerprint recognition accuracy of the product.

[0041] In an optional embodiment of the present invention, the refractive index n1 of the first light guide 21 and the refractive index n0 of the reflector 30 satisfy: n1>n0.

[0042] Specifically, the present invention specifies that the refractive index of the first light guide 21 is greater than that of the reflectors 30 located on either side of it. When light travels from the first light guide 21 toward the reflectors 30, it is equivalent to traveling from a medium with a higher refractive index to a medium with a lower refractive index. Consequently, at least a portion of the light is reflected back into the first light guide 21 at the interface. Within the first light guide 21, the light is continuously reflected by the reflectors 30 before being directed toward the photosensitive unit 40. This effectively increases the effective utilization rate of the light transmitted through the first light guide 21, effectively increasing the amount of light transmitted through the first light guide 21 to the photosensitive unit 40, thereby improving the photosensitivity of the photosensitive unit 40.

[0043] Continue to refer Figure 2 and Figure 3 In an optional embodiment of the present invention, the reflector 30 includes a first reflector 31 and a second reflector 32 located on both sides of the first light guide 21, and the refractive index of the first reflector 31 is n 01 The refractive index of the second reflector 32 is n02 , where n 01 =n 02 .

[0044] Specifically, when the refractive indices of the first reflector 31 and the second reflector 32 arranged on both sides of the first light guide 21 are set to be the same, when the incident angles of the light emitted from the first light guide 21 to the first reflector 31 and the second reflector 32 are the same, the reflection angles will also be the same, that is, the first reflector 31 and the second reflector 32 have the same ability to reflect light, which is beneficial to improving the uniformity of the overall light guiding in the optical transmission structure.

[0045] Of course, in some other embodiments of the present invention, the refractive indices of the first reflector 31 and the second reflector 32 located on both sides of the same first light guide 21 can also be set to be different. Since the refractive index of the first reflector 31 and the refractive index of the second reflector 32 are both smaller than the refractive index of the first light guide 21, the light emitted from the first light guide 21 to the first reflector 31 and the second reflector 32 can be further reflected into the first light guide 21 and then emitted into the area between the light-emitting elements 10, and transmitted to the photosensitive unit 40, which is also beneficial to improving the photosensitivity of the photosensitive unit 40.

[0046] In an optional embodiment of the present invention, the first reflector 31 and the second reflector 32 are made of the same material.

[0047] Specifically, when the first reflector 31 and the second reflector 32 located on both sides of the first light guide 21 are made of the same material, the first reflector 31 and the second reflector 32 can be manufactured in the same manufacturing process, which is conducive to simplifying the overall manufacturing process of the display device and improving production efficiency.

[0048] In an optional embodiment of the present invention, along the direction from the first reflector 31 to the second reflector 32 , the thicknesses of the first reflector 31 and the second reflector 32 are the same.

[0049] Optionally, the smaller the thickness of the first reflector 31 and the second reflector 32 on either side of the first light guide 21, the smaller the area occupied by the first reflector 31 and the second reflector 32 in the display area of the display device, which is more conducive to improving the pixel density of the display device. In the present invention, when the first reflector 31 and the second reflector 32 have the same thickness, there is no need to manufacture the first reflector 31 and the second reflector 32 separately according to different thickness specifications. This helps simplify the manufacturing process of the first reflector 31 and the second reflector 32 and improves the production efficiency of the display device.

[0050] Figure 4 FIG. 1 is another partially enlarged schematic diagram of the display area of the display device 1. Figure 5 Shown Figure 4 A BB cross-sectional view of a display device, please refer to Figure 4 and Figure 5 In an optional embodiment of the present invention, the light transmission structure 60 also includes a plurality of second light guides 22. Along the first direction, the second light guides 22 cover the light emitting element 10. The refractive index of the second light guides 22 is n2, wherein n2>n0, wherein the first direction is perpendicular to the substrate 00.

[0051] Specifically, in the display device provided by the embodiment of the present invention, the light transmission structure 60 includes, in addition to the first light guide 21 and the reflector 30, a second light guide 22, wherein the second light guide 22 covers the light-emitting element 10. In other words, the second light guide 22 covers the upper surface and side surfaces of the light-emitting element 10. Optionally, the reflector 30 is located on the outer side surface of the second light guide 22. In the embodiment of the present invention, the refractive index of the second light guide 22 is set to be greater than the refractive index of the reflector 30. When the light emitted by the light-emitting element 10 is emitted from the second light guide 22 to the interface between the reflector 30 and the second light guide 22, it is equivalent to being transmitted from a medium with a larger refractive index to a medium with a smaller refractive index. In this way, at least a portion of the light will be reflected back into the second light guide 22 at the interface between the two. The light will be continuously reflected by the reflector 30 in the second light guide 22 and will eventually be emitted to the light-emitting surface of the display device. The method of setting up the second light guide 22 in the display device is equivalent to setting up a light guide channel for the light-emitting element 10, so that most of the light emitted by the light-emitting element 10 can be directed toward the light-emitting surface of the display device, which is beneficial to improving the effective utilization rate of the light emitted by the light-emitting element 10, and thus is beneficial to improving the overall brightness of the display device.

[0052] Continue to refer Figure 4 and Figure 5 In an optional embodiment of the present invention, the refractive index of the first light guide 21 and the refractive index of the second light guide 22 satisfy: n1=n2.

[0053] Specifically, in the embodiment of the present invention, when the refractive index of the first light guide 21 is set to be the same as the refractive index of the second light guide 22, the first light guide 21 and the second light guide 22 can be made of the same material, and the first light guide 21 and the second light guide 22 can be made in the same process. On the one hand, it is beneficial to simplify the types of constituent materials of the film layer included in the display device, and on the other hand, it is also beneficial to improve the production efficiency of the display device and reduce production costs.

[0054] Continue to refer Figure 4 and Figure 5 In an optional embodiment of the present invention, along the first direction, the same second light guide 22 covers one light emitting element 10 .

[0055] Specifically, in the display device provided by this embodiment, when the second light guide 22 is introduced, optionally, the second light guide 22 is arranged in a one-to-one correspondence with the light-emitting element 10, that is, one second light guide 22 only covers one light-emitting element 10. In this way, it is equivalent to introducing a separate light-guiding channel for each light-emitting element 10. The light emitted by each light-emitting element 10 is transmitted to the light-emitting surface of the display device through the light-guiding effect of the second light guide 22, which is beneficial to improving the effective utilization rate of the light emitted by each light-emitting element 10, and is therefore more beneficial to improving the overall display brightness of the display device and improving the display effect.

[0056] Continue to refer Figure 4 and Figure 5 In an optional embodiment of the present invention, the same reflector 30 is arranged around a second light guide 22.

[0057] Specifically, when a second light guide 22 is introduced on the light-emitting side of the light-emitting element 10, in an embodiment of the present invention, a reflector 30 is introduced for each second light guide 22, and the reflector 30 is disposed around the second light guide 22. Optionally, the side surfaces of the second light guide 22 are all covered by the reflector 30. When part of the light emitted by the light-emitting element 10 is directed toward the side surfaces of the second light guide 22 in any direction, since the side surfaces of the second light guide 22 are surrounded by the reflector 30, this part of the light will be reflected by the reflector 30 and will be reflected back into the second light guide 22. After multiple reflections, it will be directed toward the light-emitting surface of the display device. The arrangement of the reflector 30 surrounding the second light guide 22 allows the light emitted by the light-emitting element 10 that may not originally be emitted toward the light-emitting surface to be effectively utilized. This part of the light is finally emitted toward the light-emitting surface of the display device after being reflected by the second light guide 22 and the reflector 30. This is more conducive to improving the effective utilization rate of the light of the light-emitting element 10 corresponding to the second light guide 22, and further more conducive to improving the overall brightness of the display device.

[0058] Optionally, the reflector around the first light guide 21 and the reflector around the second light guide 22 are made of the same material and reused with each other. For example, the reflector 30 located between the first light guide 21 and the second light guide 22 can reflect both the light in the first light guide 21 and the light in the second light guide 22.

[0059] Figure 6 FIG. 1 is another partially enlarged schematic diagram of the display area of the display device 1. Figure 7 Shown Figure 6A CC cross-sectional view of a display device. In an optional embodiment of the present invention, the light-emitting element 10 includes a first color light-emitting element 11, a second color light-emitting element 12 and a third color light-emitting element 13, and the refractive index of the second light guide 22 corresponding to the first color light-emitting element 11, the second color light-emitting element 12 and the third color light-emitting element 13 is the same.

[0060] Specifically, this embodiment illustrates the relative positional relationship between each light-emitting element 10, the second light guide 22, and the reflector 30 when a display device is provided with three light-emitting elements 10 emitting light of different colors. When a display device is provided with three light-emitting elements 10 emitting light of different colors, this embodiment provides a second light guide 22 and a reflector 30 surrounding the second light guide 22 for each light-emitting element 10. Light emitted by the light-emitting elements 10 emitting light of different colors passes through the corresponding second light guide 22 toward the light-emitting surface of the display device. The reflector 30 also acts as a barrier to prevent color mixing of light emitted by the light-emitting elements 10 emitting light of different colors. In this embodiment, by setting the refractive index of the second light guides 22 corresponding to the light-emitting elements 10 of different colors to be the same, each second light guide 22 can be made of the same material. There is no need to design the second light guides 22 for light-emitting elements 10 of different colors differently. All second light guides 22 can be manufactured using the same manufacturing process, thereby simplifying the manufacturing process of the display device and improving the production efficiency of the display panel.

[0061] Continue to refer Figure 6 and Figure 7 In an optional embodiment of the present invention, the light emitting element 10 includes a first color light emitting element 11, a second color light emitting element 12 and a third color light emitting element 13. The refractive index of the second light guide 221 corresponding to the first color light emitting element 11 is n 21 The refractive index of the second light guide 222 corresponding to the second color light emitting element 12 is n 22 The refractive index of the second light guide 223 corresponding to the third color light emitting element 13 is n 23 The refractive index of the reflector 30 corresponding to the first color light emitting element 11 is n 01 The refractive index of the reflector 30 corresponding to the second color light emitting element 12 is n 02 The refractive index of the reflector 30 corresponding to the third color light emitting element 13 is n 03 ; where n 21 -n 01 =n 22 -n 02 =n 23 -n 03 .

[0062] Continue to refer Figure 6 and Figure 7 When different second light guides 22 are provided for light emitting elements 10 of different luminous colors, each second light guide 22 is surrounded by a different reflector 30. This embodiment limits the difference in refractive index between the second light guides 22 corresponding to different light emitting elements 10 and the reflector 30 surrounding the second light guide 22. The difference in refractive index between the second light guide 221 corresponding to the first color light emitting element 11 and the reflector 30 is set to n. 21 -n 01 , the refractive index difference n between the second light guide 222 and the reflector 30 corresponding to the second color light emitting element 12 22 -n 02 , and the refractive index difference n between the second light guide 223 and the reflector 30 corresponding to the third color light emitting element 13 23 -n 03 The same material ensures that the second light guides 22 and reflectors 30 corresponding to the light emitting elements 10 of different luminous colors have the same reflective capabilities for light of different colors, which helps improve the overall brightness uniformity of the display device. In addition, when the refractive index of the second light guides 22 corresponding to the light emitting elements 10 of different luminous colors is the same, the refractive index of the reflectors 30 corresponding to the light emitting elements 10 of different luminous colors will also be the same. In this way, when the second light guides 22 are made of the same material and in the same process, the reflectors 30 can also be made of the same material and in a different process. This helps simplify the manufacturing process of the display device and improves the production efficiency of the display device.

[0063] Continue to refer Figure 6 and Figure 7 In an optional embodiment of the present invention, the light emitting element 10 in the display device includes a red light emitting element R, a green light emitting element G and a blue light emitting element B. The refractive index of the second light guide 22 corresponding to the red light emitting element R is n 21 The refractive index of the second light guide 22 corresponding to the green light emitting element G is n 22 The refractive index of the second light guide 22 corresponding to the blue light emitting element B is n 23 The refractive index of the reflector 30 corresponding to the red light emitting element R is n 01 The refractive index of the reflector 30 corresponding to the green light emitting element G is n 02 The refractive index of the reflector 30 corresponding to the blue light emitting element B is n 03 ; where n 23 -n 03 >n 22 -n 02 >n 21 -n 01 .

[0064] Optionally, the light-emitting element 10 provided in the embodiment of the present invention is a Micro LED or Mini LED. Generally, the red light-emitting element R has the highest luminous efficiency, the blue light-emitting element B has the lowest luminous efficiency, and the green light-emitting element G has an intermediate luminous efficiency. To balance the differences in luminous efficiency among the light-emitting elements 10 of different colors, this embodiment sets the refractive index difference between the second light guide 22 and the reflector 30 corresponding to the blue light-emitting element B to the maximum. This allows more light from the blue light-emitting element B to be transmitted to the light-emitting surface of the display device under the action of the second light guide 22 and the reflector 30, thereby increasing the brightness of the blue light-emitting element B with lower luminous efficiency. The refractive index difference between the second light guide 22 and the reflector 30 corresponding to the green light-emitting element G is set to the intermediate value, while the refractive index difference between the second light guide 22 and the reflector 30 corresponding to the red light-emitting element R is set to the minimum value. This reduces the difference in light emitted from the light-emitting elements 10 of different luminous efficiencies toward the light-emitting surface of the display device, balances the actual luminous efficiency differences among the light-emitting elements 10 of different colors, and further improves the display effect of the display device.

[0065] Continue to refer Figure 6 and Figure 7 In an optional embodiment of the present invention, along the arrangement direction of the light emitting elements 10, the width of the interval between any two adjacent reflectors 30 is equal.

[0066] Specifically, in the embodiment of the present invention, when the interval widths between two adjacent reflectors 30 are set to be equal, different reflectors 30 can be formed according to the same interval specifications, without the need to design the intervals between different reflectors 30 differently. Therefore, while improving the light output rate of the display device through the reflectors 30 and the light guide, it is also beneficial to simplify the manufacturing process of the display device and improve the production efficiency of the display device.

[0067] Continue to refer Figure 6 and Figure 7 In an optional embodiment of the present invention, the outline shape of the orthographic projection of the light emitting element 10 on the substrate 00 is the same as the outline shape of the orthographic projection of the reflector 30 corresponding to the light emitting element 10 on the substrate 00 .

[0068] Specifically, when the second light guide 22 is introduced into the light-emitting element 10, the reflector 30 is arranged around the second light guide 22. When the light-emitting element 10 and the positive projection of the reflector 30 corresponding to the light-emitting element 10 are set to have the same contour shape, the interface connection between the reflector 30 and the second light guide 22 is more reliable, the reflector 30 has better covering properties on the second light guide 22, and is more conducive to the reflection of light.

[0069] The above embodiment is described by taking the outline shape of the orthographic projection of the light emitting element 10 on the substrate 00 and the outline shape of the reflector 30 corresponding to the light emitting element 10 on the substrate 00 as a rectangle. In some other embodiments of the present invention, the outline shapes of the orthographic projection of the light emitting element 10 and the reflector 30 corresponding to the light emitting element 10 on the substrate 00 can also be set to other shapes, such as Figure 8 As shown, they are all set to be circular, or as Figure 9 The shapes shown are all elliptical, etc., which are not specifically limited in the present invention. Figure 8 and Figure 9 They are Figure 1 Another partially enlarged schematic diagram of the display area of the display device.

[0070] Please refer to Figure 6 and Figure 8 In an optional embodiment of the present invention, the outer edge of the outline of the orthographic projection of the light-emitting element 10 on the substrate 00 is the first edge B1, the inner edge of the outline of the orthographic projection of the reflector 30 corresponding to the light-emitting element 10 on the substrate 00 is the second edge B2, and the distance d0 between the first edge B1 and the second edge B2 is equal.

[0071] Specifically, when the distance d0 between the outer edge of the outline of the orthographic projection of the light-emitting element 10 on the substrate 00 and the inner edge of the orthographic projection of the reflector 30 on the substrate 00 is set to be equal, the spacing between the light-emitting element 10 and the corresponding reflector 30 is relatively uniform, and the distance that the light of the same angle emitted by the light-emitting element 10 propagates to the reflector 30 is also more uniform, which is beneficial to improving the uniformity of the reflection efficiency of the reflector 30 for the light emitted from different directions by the light-emitting element 10, and thus is beneficial to improving the overall light extraction efficiency of the light-emitting element 10.

[0072] The above embodiment shows a solution in which the shapes of the orthographic projections of the light emitting elements 10 and the corresponding reflectors 30 on the substrate 00 are the same in the display device. In some other embodiments of the present invention, the outline shape of the orthographic projection of the reflectors 30 corresponding to the light emitting elements 10 on the substrate 00 may be different from the outline shape of the light emitting elements 10. For example, please refer to Figure 10 , Figure 10 Shown Figure 1 Another partially enlarged schematic diagram of the display area of the display device in FIG. 1 . In an optional embodiment of the present invention, the reflectors 30 corresponding to the light-emitting elements 10 of the same color have the same shape of the orthographic projection on the substrate 00, and the shapes of the reflectors 30 corresponding to the light-emitting elements 10 of the same color include a first shape and a second shape, and the first shape and the second shape are alternately arranged along the arrangement direction of the light-emitting elements 10.

[0073] Continue to refer Figure 10, light-emitting elements 10 of the same color are represented by the same fill pattern in the drawings, and light-emitting elements 10 of different colors are distinguished by different fill patterns. In this embodiment, taking the first color light-emitting elements 11 as an example, the contour shape of the orthographic projection of each first color light-emitting element 11 on the substrate 00 is the same (this embodiment is described using a rectangle as an example), which helps to simplify the manufacturing process of light-emitting elements 10 of the same color and improve production efficiency. The contour shape of the orthographic projection of the reflector 30 corresponding to the first color light-emitting element 11 on the substrate 00 includes two shapes, namely a first shape (described using a circle as an example) and a second shape (described using a rectangle as an example). One of the first shape and the second shape can be the same as the projection contour shape of the corresponding light-emitting element 10, or both can be different from the projection contour shape of the corresponding light-emitting element 10. The present invention does not specifically limit this. When the luminous efficiency of the first color light-emitting element 11 is the highest compared to the second color light-emitting element 12 and the third color light-emitting element 13, the embodiment of the present invention is beneficial to reduce the light output of the first color light-emitting element 11 to a certain extent by setting the projection profile of at least part of the reflector 30 corresponding to the first color light-emitting element 11 to be different from the projection profile shape of the first color light-emitting element 11, so as to balance the difference in luminous efficiency between the first color light-emitting element and the other color light-emitting elements 10, thereby improving the overall display effect of the display device.

[0074] In addition, in this embodiment, the first shape and the second shape are alternately arranged along the arrangement direction of the light-emitting element 10, which is beneficial to improving the overall luminous brightness uniformity of the light-emitting elements 10 of the same luminous color in the display device, avoiding the phenomenon of local overbrightness or local overdarkness, which affects the display effect.

[0075] Optionally, for a light-emitting element 10 with lower luminous efficiency, the projection profile shape of the corresponding reflector 30 can be set to be the same as that of the reflector, thereby increasing the amount of light emitted from the light-emitting element 10 to the light-emitting surface of the display device to a certain extent, so as to balance the difference in luminous efficiency between the light-emitting element 10 and other color light-emitting elements 10, and improve the overall display effect of the display device.

[0076] It should be noted that Figure 10 The contours of the orthographic projections of the light emitting element 10 and the reflector 30 on the substrate 00 in the embodiment are only for illustration. In some other embodiments of the present invention, the shapes of the light emitting element 10 and the reflector 30 may be adjusted according to actual conditions, and the present invention is not limited thereto.

[0077] also, Figure 10The embodiment shows a scheme in which the orthographic projection contour shapes of the light-emitting elements 10 of the same color are the same. Optionally, the orthographic projection contour shapes of the light-emitting elements 10 of different colors are different. For example, the orthographic projection contour shape of the first color light-emitting element 11 is a rectangle, the orthographic projection contour shape of the second color light-emitting element 12 is a square, the orthographic projection contour shape of the third color light-emitting element 13 is a circle, and so on.

[0078] Optionally, in order to further balance the differences in luminous efficiency of light-emitting elements 10 of different colors, the present application may also appropriately increase the size of the light-emitting element 10 with lower luminous efficiency to increase the amount of light emitted from the light-emitting element 10 with lower luminous efficiency to the light-emitting surface of the display device.

[0079] Figure 11 Shown Figure 1 Another partially enlarged schematic diagram of the display area of the display device in FIG. 1 . In an optional embodiment of the present invention, the shapes of the orthographic projections of the reflectors 30 corresponding to the light-emitting elements 10 on the substrate 00 are the same.

[0080] Specifically, when the reflector 30 is introduced around the second light guide 22, this embodiment shows a solution in which the contour shape of the orthographic projection of each reflector 30 in the display device on the substrate 00 is a rectangle. When the contour shape of the orthographic projection of each reflector 30 is set to be the same, the same shape specification can be used to manufacture each reflector 30, which is conducive to simplifying the manufacturing process of the reflector 30 and improving the manufacturing efficiency of the display device.

[0081] The above embodiment of the present invention shows a scheme in which the light emitting elements 10 and the second light guides 22 are arranged in a one-to-one correspondence, that is, different light emitting elements 10 correspond to different second light guides 22. In some other embodiments of the present invention, one second light guide 22 may also correspond to two or more light emitting elements 10. For example, please refer to Figure 12 , Figure 12 Shown Figure 1 In an optional embodiment of the present invention, the same second light guide 22 covers at least two adjacent light emitting elements 10 , and the same reflector 30 is disposed around the same second light guide 22 .

[0082] Specifically, Figure 12The illustrated embodiment shows a scheme in which two adjacent light-emitting elements 10 are covered by the same second light guide 22. Light emitted by the two light-emitting elements 10 covered by the same second light guide 22 is reflected by the second light guide 22 and the reflector 30 and then emitted toward the light-emitting surface of the display device. The scheme in which the same second light guide 22 covers at least two light-emitting elements 10 is equivalent to increasing the size of a single second light guide 22, which helps to reduce the difficulty of manufacturing the second light guide 22. Furthermore, the scheme in which the same second light guide 22 covers at least two light-emitting elements 10 effectively reduces the number of second light guides 22 included in the display device, which also helps to simplify the manufacturing difficulty of the second light guide 22, thereby improving the overall light extraction efficiency of the display device and improving the production efficiency of the display device.

[0083] Although Figure 12 The embodiment only illustrates a scheme in which the same second light guide 22 covers two light-emitting elements 10. However, in some other embodiments of the present invention, the same second light guide 22 may also cover more than two light-emitting elements 10. The correspondence between the second light guide 22 and the light-emitting elements 10 in the display device may also include the following schemes: some second light guides 22 cover the same number of light-emitting elements 10, while others cover different numbers of light-emitting elements 10. For example, some second light guides 22 cover two light-emitting elements 10, while others cover three light-emitting elements 10. This is not specifically limited in the present invention.

[0084] Continue to refer Figure 12 In an optional embodiment of the present invention, at least part of the second light guide 22 covers the same number of light emitting elements 10 .

[0085] Specifically, this embodiment illustrates a solution in which each second light guide 22 covers the same number of light-emitting elements 10, using the example of two light-emitting elements 10 covered by each second light guide 22. When each second light guide 22 covers the same number of light-emitting elements 10, the dimensions of each second light guide 22 are identical or similar. Thus, different second light guides 22 can be manufactured using the same dimensions, thereby simplifying the manufacturing process for the second light guides 22 and the display device manufacturing process. Furthermore, when the same second light guide 22 covers two or more light-emitting elements 10, this also helps reduce the number of second light guides 22 actually included in the display device, similarly simplifying the display device manufacturing process.

[0086] Figure 13The figure shows a relative position relationship diagram between the second light guide 22 and the pixel unit P0 in the display device provided by an embodiment of the present invention. In an optional embodiment of the present invention, the display device includes a multi-pixel unit P0, the pixel unit P0 includes at least three light-emitting elements 10 with different luminous colors, and the same second light guide 22 covers one pixel unit P0.

[0087] This embodiment illustrates the positional relationship between the second light guide 22 and the pixel unit P0 when a display device includes multiple pixel units P0. Optionally, this embodiment illustrates a pixel unit P0 including three light-emitting elements 10 emitting light of different colors, where the three light-emitting elements 10 emitting light of different colors are, for example, a red light-emitting element R, a green light-emitting element G, and a blue light-emitting element B. In some other embodiments of the present invention, the same pixel unit P0 may further include four light-emitting elements 10 emitting light of different colors, where the four light-emitting elements 10 emitting light of different colors are, for example, a red light-emitting element, a green light-emitting element, a blue light-emitting element, and a white light-emitting element.

[0088] Specifically, in this embodiment, the second light guide 22 is provided in a one-to-one correspondence with the pixel unit P0, that is, one second light guide 22 covers multiple light-emitting elements 10 corresponding to the same pixel unit P0. When the display panel uses the pixel unit P0 for display, the different light-emitting elements 10 in the same pixel unit P0 form a predetermined color picture by mixing colors. In this embodiment, the same second light guide 22 covers the same pixel unit P0. When the light-emitting element 10 in the pixel unit P0 covered by the same second light guide 22 emits light, at least part of the light is transmitted from the second light guide 22 to the corresponding reflector 30, and after being reflected by the reflector 30, it returns to the second light guide 22 again, and is emitted from the light-emitting surface of the display device after multiple reflections, thereby helping to improve the light extraction efficiency of each light-emitting element 10 in the pixel unit P0. When displaying a color image, since each light-emitting element 10 within the same pixel unit P0 requires light mixing to function, when the same pixel unit P0 is covered by the same second light guide 22, the reflector 30 surrounding the second light guide 22 acts as a barrier, effectively preventing light from mixing between adjacent pixel units P0, thereby improving the display quality of the display device. Furthermore, the one-to-one correspondence between the second light guides 22 and the pixel units P0 further reduces the number of second light guides 22 included in the display device, which also helps simplify the manufacturing process of the second light guides 22.

[0089] Figure 14 FIG. 1 is a top view of the relationship between the first light guide 21 and the light sensing unit 40 in the display device provided by an embodiment of the present invention. Figure 15 Shown Figure 14A DD cross-sectional view of the display device in FIG. 2 shows a film relationship between the first light guide 21 and the light sensing unit 40. In an optional embodiment of the present invention, the light sensing unit 40 includes sensors arranged in an array. Along the first direction, the same light sensing unit 40 overlaps with multiple first light guides 21; the first light guide 21 overlapping with the same light sensing unit 40 includes a first sub-light guide 211 and a second sub-light guide 212. Along the direction parallel to the substrate 00, the first sub-light guide 211 is on the substrate 00. 0 and the geometric center of the photosensitive unit 40 is d1, and the distance between the geometric center of the orthographic projection of the second sub-light guide 212 on the substrate 00 and the geometric center of the photosensitive unit 40 is d2, wherein d1<d2; the refractive index difference between the first sub-light guide 211 and the reflector 30 adjacent to it is s1, and the refractive index difference between the second sub-light guide 212 and the reflector 30 adjacent to it is s2, wherein s1<s2, wherein the first direction is perpendicular to the substrate.

[0090] Continue to refer Figure 14 and Figure 15 In an embodiment of the present invention, a plurality of light-sensing units 40 are provided on a side of the substrate 00 away from the light-emitting element 10, and the light transmitted through the first light guide 21 can be emitted from between two adjacent light-emitting elements 10 to the light-sensing unit 40. Optionally, the light-sensing unit 40 includes sensors arranged in an array, and any sensor receiving the light transmitted through the first light guide 21 can convert the light signal into an electrical signal. It can be understood that part of the light transmitted through the first light guide 21 to the light-sensing unit 40 can be, for example, inclined, that is, not perpendicular to the plane where the substrate 00 is located. In this case, even if the light-sensing unit 40 is not provided directly below the first light guide 21, the light with an inclined direction can be emitted into the light-sensing unit 40 adjacent to the position directly below the first light guide 21. Therefore, along the direction perpendicular to the plane where the substrate 00 is located, the light-sensing unit 40 provided in the embodiment of the present invention can not overlap with the first light guide 21. Of course, in some other embodiments of the present invention, the photosensitive unit 40 and the first light guide 21 can also be set to overlap in a direction perpendicular to the substrate 00. In this way, the light emitted vertically or obliquely from the first light guide 21 can be emitted toward the photosensitive unit 40, which is beneficial to increase the amount of light that the photosensitive unit 40 can receive and improve the photosensitivity of the photosensitive unit 40.

[0091] Optionally, along a direction perpendicular to the plane of the substrate 00, one photosensitive unit 40 corresponds to multiple first light guides 21. It is assumed that the first light guide 21 corresponding to the same photosensitive unit 40 includes a first sub-light guide 211 and a second sub-light guide 212, wherein the distance d1 between the first sub-light guide 211 and the geometric center of the photosensitive unit 40 is smaller than the distance d2 between the second sub-light guide 212 and the geometric center of the photosensitive unit 40, that is, the first sub-light guide 211 is closer to the geometric center of the photosensitive unit 40, and the second sub-light guide 212 is farther from the geometric center of the photosensitive unit 40. If the refractive index difference between the first sub-light guide 211 and its corresponding reflector 30 is the same as the refractive index difference between the second sub-light guide 212 and its corresponding reflector 30, since the second sub-light guide 212 is farther from the geometric center of the photosensitive unit 40, the amount of light emitted from the second sub-light guide 212 to the photosensitive unit 40 will be less than the amount of light emitted from the first sub-light guide unit to the photosensitive unit 40. To this end, the present invention differentiates the refractive index difference between the first sub-light guide 211 and its corresponding reflector 30, and the refractive index difference between the second sub-light guide 212 and its corresponding reflector 30, so that the refractive index difference between the second sub-light guide 212 and its corresponding reflector 30, which is farther away from the geometric center of the photosensitive unit 40, is designed to be larger, so as to improve the reflection efficiency of the reflector 30 for the light in the second sub-light guide 212, so that more light can be transmitted from the second sub-light guide 212 to the photosensitive unit 40, which is beneficial to improve the amount of light that the photosensitive unit 40 can receive, and further help to improve the photosensitivity accuracy of the photosensitive unit 40.

[0092] In an optional embodiment of the present invention, along the direction from the geometric center of the light sensing unit 40 to the periphery, the refractive index difference between different first light guides 21 and the reflectors 30 adjacent thereto gradually increases.

[0093] When the same photosensitive unit 40 corresponds to multiple first light guides 21, the distances between different first light guides 21 and the geometric center of the photosensitive unit 40 are not the same. In this embodiment, the refractive index difference between the first light guide 21 farther from the geometric center and its corresponding reflector 30 is larger, while the refractive index difference between the first light guide 21 farther away and its corresponding reflector 30 is smaller, and gradually changes according to the changing trend of the distance between the first light guide 21 and the geometric center, thereby increasing the amount of light transmitted from the first light guide 21 farther from the geometric center to the photosensitive unit 40, which is more conducive to improving the uniformity of the amount of light actually received by the photosensitive unit 40 and the amount of light received by sensors at different positions of the photosensitive unit 40, and thus is more conducive to improving the photosensitivity accuracy of the photosensitive unit 40.

[0094] Continue to refer Figure 15In an optional embodiment of the present invention, the light transmission structure is reused as an encapsulation layer of the display device.

[0095] Specifically, in the display device provided by the embodiment of the present invention, a light transmission structure is introduced on the side of the light-emitting element 10 away from the substrate 00, wherein the first light guide 21 is located between two adjacent light-emitting elements 10, the second light guide 22 covers the light-emitting element 10, and the reflector 30 is arranged between the first light guide 21 and the second light guide 22 and covers the second light guide 22. The light transmission structure formed by the first light guide 21, the second light guide 22 and the reflector 30 covers the light-emitting element 10 and can serve as an encapsulation layer. There is no need to introduce an encapsulation layer in the display device, which is conducive to simplifying the film structure of the display device, reducing the overall thickness of the display device, and meeting the requirements of the display device being thin and light.

[0096] Figure 16 The figure shows another film layer schematic diagram of the display device provided by an embodiment of the present invention. In an optional embodiment of the present invention, the display device further includes an encapsulation layer 50, which is located on the side of the light transmission structure away from the substrate 00, and the refractive index of the encapsulation layer 50 is the same as the refractive index of the first light guide 21.

[0097] This embodiment shows a solution for introducing an encapsulation layer 50 into a display device. Specifically, the encapsulation layer 50 is located on the side of the light transmission structure facing away from the substrate 00. The encapsulation layer 50 can prevent external moisture and impurities from contacting the light-emitting element 10, thereby improving the display reliability of the display device. In addition, when the encapsulation layer 50 is introduced, the present application sets the refractive index of the encapsulation layer 50 and the first light guide 21 to be the same. The encapsulation layer 50 and the first light guide 21 can be made of the same material, which is beneficial to simplify the types of film materials of the display device and simplify the manufacturing process of the display device. In addition, when the refractive index of the encapsulation layer 50 and the first light guide 21 is set to be the same, it is beneficial to avoid the reflection of light between the encapsulation layer 50 and the first light guide 21, thereby reducing the amount of light emitted from the first light guide 21 to the light sensing unit 40, and thus it is also beneficial to ensure the light sensing accuracy.

[0098] Continue to refer Figure 16 Optionally, the refractive index of the second light guide 22 is the same as that of the encapsulation layer 50. This helps prevent light emitted from the second light guide 22 from being reflected at the encapsulation layer 50, thereby affecting the light extraction efficiency of the display device. Furthermore, when the refractive indices of the two are the same, the same materials and the same manufacturing process can be used to simplify the display device manufacturing process and improve production efficiency.

[0099] Optionally, the encapsulation layer 50, the first light guide 21 and the second light guide 22 have the same refractive index and are made of the same material in the same manufacturing process, so as to further simplify the manufacturing process of the display device and improve production efficiency while improving the light sensitivity and light extraction rate.

[0100] The display device provided in the embodiment of the present invention can be embodied as any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, etc., and is particularly suitable for display devices with light sensing function.

[0101] In summary, the display device provided by the present invention achieves at least the following beneficial effects:

[0102] In the display device provided by the present invention, a light transmission structure is provided on the side of the light-emitting element facing away from the substrate, and a plurality of light-sensing units are provided on the side of the substrate facing away from the light-emitting element, wherein the light transmission structure includes a first light guide and a reflector provided on both sides of the first light guide, and the first light guide is located between two adjacent light-emitting elements along a direction perpendicular to the substrate. The present invention sets the refractive index of the first light guide in the light transmission structure to be different from the refractive index of the reflector, and when the light is transmitted to the interface between the first light guide and the reflector, reflection will occur, and the first light guide will form a light guide channel, and the light will be able to be transmitted through the first light guide to between two adjacent light-emitting elements, and then be able to be transmitted to the light-sensing unit. In this way, it is beneficial to increase the amount of light transmitted to the light-sensing unit and improve the light-sensing performance of the product. When the light-sensing unit provided on the side of the substrate facing away from the light-emitting element is a fingerprint recognition unit, the above-mentioned light guide channel can transmit more light to the fingerprint recognition unit, which is beneficial to improve the fingerprint recognition accuracy of the product.

[0103] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A display device, characterized in that: The device comprises a substrate, a light-emitting element disposed on one side of the substrate, a light-transmitting structure disposed on a side of the light-emitting element away from the substrate, and a plurality of light-sensing units disposed on a side of the substrate away from the light-emitting element; The light transmission structure includes a first light guide and a reflector arranged in a direction parallel to the plane of the substrate, the reflectors are located on both sides of the first light guide, and the orthographic projection of the first light guide on the substrate is located between two adjacent light-emitting elements; wherein the refractive index of the first light guide is n1, and the refractive index of the reflector is n0, where n1≠n0; The photosensitive unit includes sensors arranged in an array, and along a first direction, the same photosensitive unit overlaps with multiple first light guides; the first light guide overlapping with the same photosensitive unit includes a first sub-light guide and a second sub-light guide, and along a direction parallel to the substrate, the distance between the geometric center of the orthographic projection of the first sub-light guide on the substrate and the geometric center of the photosensitive unit is d1, and the distance between the geometric center of the orthographic projection of the second sub-light guide on the substrate and the geometric center of the photosensitive unit is d2, wherein d1<d2; the refractive index difference between the first sub-light guide and the reflector adjacent to it is s1, and the refractive index difference between the second sub-light guide and the reflector adjacent to it is s2, wherein s1<s2, and wherein the first direction is perpendicular to the substrate.

2. The display device according to claim 1, wherein n1>n0.

3. The display device according to claim 1, wherein The reflector includes a first reflector and a second reflector respectively located on both sides of the first light guide. The refractive index of the first reflector is n 01 , the refractive index of the second reflector is n 02 , where n 01 =n 02 .

4. The display device according to claim 3, wherein: The first reflector and the second reflector are made of the same material.

5. The display device according to claim 3, wherein Along a direction from the first reflector to the second reflector, the first reflector and the second reflector have the same thickness.

6. The display device according to claim 1, wherein The light transmission structure further includes a plurality of second light guides, which cover the light emitting elements along a first direction, and the refractive index of the second light guides is n2, wherein n2>n0, and wherein the first direction is perpendicular to the substrate.

7. The display device according to claim 6, wherein: n1=n2.

8. The display device according to claim 6, wherein: Along the first direction, the same second light guide covers one light emitting element.

9. The display device according to claim 8, wherein The same reflector is arranged around one second light guide.

10. The display device according to claim 8, wherein The light emitting elements include a first color light emitting element, a second color light emitting element and a third color light emitting element, and the refractive index of the second light guide corresponding to the first color light emitting element, the second color light emitting element and the third color light emitting element is the same.

11. The display device according to claim 8, wherein The light emitting elements include a first color light emitting element, a second color light emitting element and a third color light emitting element. The refractive index of the second light guide corresponding to the first color light emitting element is n 21 The refractive index of the second light guide corresponding to the second color light emitting element is n 22 The refractive index of the second light guide corresponding to the third color light emitting element is n 23 The refractive index of the reflector corresponding to the first color light emitting element is n 01 The refractive index of the reflector corresponding to the second color light emitting element is n 02 The refractive index of the reflector corresponding to the third color light emitting element is n 03 ; where n 21 -n 01 =n 22 -n 02 =n 23 -n 03 .

12. The display device according to claim 8, wherein The light emitting elements include a red light emitting element, a green light emitting element and a blue light emitting element, and the refractive index of the second light guide corresponding to the red light emitting element is n 21 The refractive index of the second light guide corresponding to the green light emitting element is n 22 The refractive index of the second light guide corresponding to the blue light emitting element is n 23 The refractive index of the reflector corresponding to the red light emitting element is n 01 The refractive index of the reflector corresponding to the green light emitting element is n 02 The refractive index of the reflector corresponding to the blue light emitting element is n 03 ; where n 23 -n 03 >n 22 -n 02 >n 21 -n 01 .

13. The display device according to claim 8, wherein Along the arrangement direction of the light emitting elements, the widths of the intervals between any two adjacent reflectors are equal.

14. The display device according to claim 8, wherein The outline shape of the orthographic projection of the light emitting element on the substrate is the same as the outline shape of the orthographic projection of the reflector corresponding to the light emitting element on the substrate.

15. The display device according to claim 8, wherein The outer edge of the outline of the orthographic projection of the light emitting element on the substrate is a first edge, the inner edge of the outline of the orthographic projection of the reflector corresponding to the light emitting element on the substrate is a second edge, and the distances between the first edge and the second edge are equal.

16. The display device according to claim 8, wherein The reflectors corresponding to the light-emitting elements of the same color have the same shape of positive projection on the substrate. The shapes of the reflectors corresponding to the light-emitting elements of the same color include a first shape and a second shape. The first shape and the second shape are alternately arranged along the arrangement direction of the light-emitting elements.

17. The display device according to claim 8, wherein The reflectors corresponding to the light emitting elements have the same shape as their orthographic projections on the substrate.

18. The display device according to claim 6, wherein The same second light guide covers at least two adjacent light emitting elements, and the same reflector is arranged around the same second light guide.

19. The display device according to claim 18, wherein At least part of the second light guides covers the same number of light emitting elements.

20. The display device according to claim 18, wherein The display device includes a multi-pixel unit, each pixel unit includes at least three light-emitting elements with different luminous colors, and the same second light guide covers one pixel unit.

21. The display device according to claim 1, wherein Along the direction from the geometric center of the light sensing unit to the periphery, the refractive index differences between different first light guides and the reflectors adjacent thereto gradually increase.

22. The display device according to claim 1, wherein The light transmission structure is reused as an encapsulation layer of the display device.

23. The display device according to claim 1, wherein It also includes an encapsulation layer, which is located on a side of the light transmission structure away from the substrate, and has a refractive index that is the same as that of the first light guide.

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