Display module and display device

Abstract

The application discloses a display module and a display device, and belongs to the technical field of display. The display module comprises a backlight module and a display panel located on one side of a light-emitting surface of the backlight module. The display module comprises a hollow part provided with a light-sensing element, and the hollow part at least penetrates the backlight module. The backlight module at least comprises a back plate, a backlight source and a plurality of optical film pieces, and the plurality of optical film pieces at least comprise a light guide plate. The backlight module further comprises a light adjustment assembly, the light adjustment assembly is arranged around the hollow part, and along a direction parallel to the light-emitting surface of the display module, the light adjustment assembly is located on one side of the light-sensing element facing the optical film piece. Each light adjustment structure group of the light adjustment assembly comprises a first light adjustment film layer and a second light adjustment film layer arranged in a stack. The refractive index of the first light adjustment film layer is greater than that of the second light adjustment film layer. The display device comprises the above display module. The application can avoid the light of the backlight module leaking into the camera area, affecting the shooting quality, and can also improve the display effect of the full-screen.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, more particularly, to a display module and a display device. BACKGROUND

[0002] With the development demand of full screen, more and more electronic photosensitive devices need to be integrated into the display device, such as opening a hole in the display area of the display device (such as a flat panel, a smart phone, etc.), setting an in-plane camera (i.e. an under-screen camera), so as to improve the screen ratio of the display area. For a liquid crystal display device, a backlight hole is generally formed in a backlight module, and a camera is arranged in the backlight hole. Currently, the problems to be solved include that the camera corresponding area needs to achieve high transparency, so that the imaging quality is relatively good; the backlight module needs to be hole-digged in the camera area, and the hole-digged backlight module cannot pass light during display; during display, the normal display area needs to be substantially consistent with the display effect of the camera area.

[0003] However, the light emitted from the light guide plate is easy to leak into the camera area at the boundary between the display area and the camera area in the shooting mode of the current device, causing light leakage and making the shooting effect worse, which affects the imaging quality of the camera; if the hole-digging position of the camera area is sealed with glue, although the black glue can block the light leakage, a black border is easy to be formed in the display mode, which affects the display quality of the full screen.

[0004] Therefore, it is a technical problem to be solved by those skilled in the art to provide a display module and a display device which can avoid the light of the backlight module from leaking into the camera area and affecting the shooting quality, and also avoid affecting the display effect of the full screen. SUMMARY

[0005] Therefore, the present application provides a display module and a display device to solve the problem that the display quality and the shooting quality cannot be considered in the current under-screen camera technology.

[0006] The application discloses a display module, comprising: a backlight module and a display panel arranged oppositely, the display panel being located on one side of a light emitting surface of the backlight module; the display module comprises a hollow part, the hollow part penetrating at least the backlight module along a direction perpendicular to the light emitting surface of the display module, and a photosensitive element being arranged in the hollow part; the backlight module comprises at least a back plate, a backlight source and a plurality of optical films arranged on a side of the back plate facing the display panel, the plurality of optical films being stacked along a direction perpendicular to the light emitting surface of the display module; the plurality of optical films comprises at least a light guide plate; the backlight module further comprises a light adjusting assembly, the light adjusting assembly being arranged around the hollow part and located on a side of the photosensitive element facing the optical films along a direction parallel to the light emitting surface of the display module; the light adjusting assembly comprises at least one light adjusting structure group, each light adjusting structure group comprising a first light adjusting film layer and a second light adjusting film layer stacked; a refractive index of the first light adjusting film layer is greater than a refractive index of the second light adjusting film layer.

[0007] Based on the same inventive concept, the application further discloses a display device comprising the display module.

[0008] Compared with the prior art, the display module and the display device provided by the application at least achieve the following beneficial effects:

[0009] The display module provided by the application comprises a backlight module, a display panel and a photosensitive element, the photosensitive element is located on the side away from the light emitting surface of the backlight module, and the photosensitive element can be a camera assembly. The hollow part of the display module at least penetrates the backlight module, and the photosensitive element is fixedly arranged in the hollow part. In the non-display mode, the camera assembly works to take pictures, and in the display mode, the photosensitive element of the camera assembly does not work, and the display module displays a full-screen picture. The backlight module further comprises a light adjusting assembly, the light adjusting assembly is arranged around the hollow part, the light adjusting assembly is arranged at the position of the edge of the hollow part between the photosensitive element and the optical film sheet which is prone to light leakage, the light adjusting assembly comprises at least one light adjusting structure group, each light adjusting structure group comprises a first light adjusting film layer and a second light adjusting film layer arranged in layers, the first light adjusting film layer and the second light adjusting film layer with different refractive indexes form at least one pair of light adjusting film layers, and one pair of light adjusting film layers, i.e. one light adjusting structure group, has total reflection of light. When the light rays emitted from the light guide plate are transmitted to the position of the edge of the hollow part which is prone to light leakage, at least one light adjusting structure group at the position is used to form a total reflection interface, i.e. the light emitted from the light guide plate can be totally reflected back to the side of the light emitting surface of the backlight module when the light reaches the edge of the hollow part, thereby the light leakage of the light emitted from the light guide plate at the edge of the hollow part can be greatly reduced, the light leakage problem of the edge of the hollow part towards the photosensitive element is improved, the shooting effect can be improved in the shooting mode, the imaging quality of the camera is improved, and in the display mode, the first light adjusting film layer and the second light adjusting film layer of at least one light adjusting structure group in the light adjusting assembly are light-transmitting structures and not light-blocking structures, so they will not affect the display, and the display quality of the full screen can be ensured. Therefore, the light adjusting assembly arranged at the position of the edge of the hollow part which is prone to light leakage can avoid light leakage, ensure the shooting quality, and also ensure the display quality, thereby the good shooting quality and display quality can be achieved.

[0010] Of course, it is not necessary for any product implementing the present application to achieve all the technical effects mentioned above at the same time.

[0011] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0012] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0013] Figure 1 is a planar structure schematic view of the display module provided by the embodiment of the present application;

[0014] Figure 2 is Figure 1 is a sectional structure schematic view of the direction of A-A' in

[0015] Figure 3 is Figure 2 the light path diagram of the interface of the light adjusting assembly in the middle;

[0016] Figure 4 is Figure 1 another sectional structure schematic view of the A-A' direction in the middle;

[0017] Figure 5 is the reflectivity simulation curve diagram after the light adjusting assembly shown in Figure 4 ;

[0018] Figure 6 is Figure 1 another sectional structure schematic view of the A-A' direction in the middle;

[0019] Figure 7 is Figure 1 another sectional structure schematic view of the A-A' direction in the middle;

[0020] Figure 8 is Figure 7 the local enlarged structure schematic view of the J1 area in the middle;

[0021] Figure 9 is Figure 8 the partial light path diagram of the light incident into the light adjusting assembly in the middle;

[0022] Figure 10 is Figure 1 another sectional structure schematic view of the A-A' direction in the middle;

[0023] Figure 11 is Figure 10 the local enlarged structure schematic view of the J2 area in the middle;

[0024] Figure 12 is the plane structure schematic view of the display device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments are illustrative only and do not limit the scope of the present application unless otherwise specifically stated.

[0026] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application or its applications or uses.

[0027] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and devices can be viewed as part of the specification.

[0028] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0029] Various modifications and changes can be made to the present application in matters of construction and arrangement of parts without departing from the scope of the present application, which is defined in the claims. Accordingly, all modifications and changes deemed appropriate for embodying the present application are intended to be within the scope of the present application. It should be noted that the embodiments provided by the present application can be combined with each other as long as they are not contradictory.

[0030] It should be noted that similar reference numbers and letters refer to similar items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0031] Reference should be made to both drawings together Figures 1-3 , Figure 1 is a schematic view of a planar structure of a display module provided by the embodiments of the present application, Figure 2 is Figure 1 is a schematic view of a cross-sectional structure along A-A' direction in Figure 3 is Figure 2 is a light path diagram of an interface of a light adjusting assembly in the present embodiment, the display module 000 provided by the present embodiment comprises a backlight module 10 and a display panel 20 arranged oppositely, the display panel 20 is located on one side of a light emitting surface 10E of the backlight module 10 (not filled in Figure 2 );

[0032] The display module 000 comprises a hollow part 00K, the hollow part 00K at least penetrates the backlight module 10 along a direction Z perpendicular to the light emitting surface of the display module 000, and a photosensitive element 30 is arranged in the hollow part 00K;

[0033] The backlight module 10 at least comprises a back plate 101, a backlight source 102 and a plurality of optical films 103 located on a side of the back plate 101 facing the display panel 20, and the plurality of optical films 103 are arranged in a stacking manner along a direction Z perpendicular to the light emitting surface of the display module 000; the plurality of optical films 103 at least comprise a light guide plate 1031;

[0034] The backlight module 10 further comprises a light adjusting assembly 104, the light adjusting assembly 104 is arranged around the hollow part 00K, and along a direction X parallel to the light emitting surface of the display module 000, the light adjusting assembly 104 is located on a side of the photosensitive element 30 facing the optical films 103;

[0035] The light adjusting assembly 104 comprises at least one light adjusting structure group 1040, each light adjusting structure group 1040 comprises a first light adjusting film layer 1040A and a second light adjusting film layer 1040B which are arranged in a stack along a direction X parallel to the light emitting surface of the display module 000.

[0036] The refractive index of the first light adjusting film layer 1040A is greater than the refractive index of the second light adjusting film layer 1040B.

[0037] Specifically, the display module 000 provided in the embodiment comprises a backlight module 10, a display panel 20 and a photosensitive element 30, the photosensitive element 30 is located on the side away from the light emitting surface 10E of the backlight module 10. Optionally, the photosensitive element 30 can be a camera assembly or a photoelectric sensor and the like. The embodiment takes the photosensitive element 30 as a camera assembly and the display module 000 as an under-screen camera structure as an example for illustration. The display panel 20 is located on the side of the light emitting surface 10E of the backlight module 10, and the backlight module 10 and the display panel 20 can form a liquid crystal display module. The display module 000 comprises a hollow part 00K, along a direction Z perpendicular to the light emitting surface of the display module 000, the hollow part 00K at least penetrates the backlight module 10, and the photosensitive element 30 is fixedly arranged in the hollow part 00K. The embodiment does not make specific limitation on the fixed connection mode of the photosensitive element 30 and the backlight module 10, and the photosensitive element 30 can be directly fixed with the iron frame or the back plate 101 of the backlight module 10, or the photosensitive element 30 can be fixedly adhered with the iron frame of the backlight module 10 by sealing glue (not shown in the figure), at this time the sealing glue can be located in the hollow part 00K. In actual implementation, the selection and setting can be made according to actual requirements, as long as the effect of fixing the photosensitive element 30 with the backlight module 10 can be achieved.

[0038] The backlight module 10 of the embodiment at least comprises a back plate 101 Figure 2The back plate 101 can be understood as a part of the shell accommodating other film layer structures of the backlight module 10, such as the back plate 101 can be understood as a part of the iron frame of the backlight module 10. In the hollow part 00K area, the iron frame can also form a light-shielding iron frame side wall. The shape and material of the back plate 101 are not specifically limited in the embodiment, and only need to meet the requirements of being able to form a space and supporting the optical film and other structures. The backlight source 102 provided on the side of the back plate 101 facing the display panel 20 can be a side-in backlight source. The plurality of optical films 103 are stacked in the direction Z perpendicular to the light-out surface of the display module 000. The plurality of optical films 103 at least include a light guide plate 1031. The backlight source 102 can be arranged in a strip-shaped arrangement structure at one side edge position of the light guide plate 1031, so as to convert the side-in backlight source 102 into a uniform surface light source, and improve the light-out uniformity of the light-out surface 10E of the backlight module 10. The light guide plate 1031 can be an optical-grade acrylic or polycarbonate plate. The light guide points (not shown in the figure) are printed on the bottom surface of the optical-grade acrylic plate by laser engraving, V-shaped cross grid engraving, UV screen printing technology, etc. When light guiding, the optical-grade acrylic plate can absorb the light emitted from the side-in backlight source 102, and the light stays on the surface of the optical-grade acrylic plate. When the light hits each light guide point, the reflected light will be diffused in various directions, and then be emitted from the front surface (i.e. the surface of the light guide plate 1031 facing the display panel 10) of the light guide plate 1031 after breaking the reflection condition. The light uniformity principle of the light guide plate 1031 is to make the light guide plate 1031 uniformly emit light through various light guide points of different densities and sizes. It can be understood that the thickness of the light guide plate 1031 illustrated in the embodiment does not represent the actual thickness in actual implementation. In actual implementation, the thickness can be designed according to actual requirements. Figure 2 The thickness of the light guide plate 1031 illustrated in the embodiment does not represent the actual thickness in actual implementation. In actual implementation, the thickness can be designed according to actual requirements.

[0039] Optionally, the plurality of optical films 103 in the embodiment are stacked in the direction Z perpendicular to the light-emitting surface of the display module 000. The optical films 103 can further include a reflective sheet 1032 on the side of the light guide plate 1031 facing the back plate 101, and can further include a diffusion sheet 1033 and a brightness enhancement sheet 1034 on the side of the light guide plate 103 away from the back plate 101. The reflective sheet 1032 can be used to reflect light exposed on the bottom surface back into the light guide plate 1031, thereby improving the use efficiency of light, so that the luminous efficiency is high and the power consumption is low under the condition of the same area luminous brightness. The diffusion sheet 1033 can include a plurality of light diffusion particles with different particle sizes. During the process of light passing through the diffusion sheet 1033, the plurality of light diffusion particles can refract, scatter and reflect the light, thereby improving the diffusion effect of the backlight. Since the light directionality is poor after the light is emitted from the diffusion sheet 1033, the prism structure on the brightness enhancement sheet 1034 above the diffusion sheet 1033 is needed to correct the direction of the light. The use of refraction and reflection of light can achieve the purpose of condensing light and improving the brightness of the emitted light, thereby increasing the use efficiency of the light emitted from the diffusion sheet 1033 and improving the brightness of the overall backlight module 10.

[0040] The working mode of the display module 000 of the embodiment can include a display mode and a non-display mode. When the light sensing element 30 is a camera assembly, the camera assembly works to take pictures in the non-display mode, and the light sensing element 30 of the camera assembly does not work in the display mode, and the display module 000 displays a full-screen display picture.

[0041] However, in the non-display mode, light emitted from the light guide plate 1031 is easy to leak to the area where the camera assembly is located in the edge area of the hollow part 00K, causing light leakage and resulting in poor shooting effect. If the light-blocking glue is filled in the position where the light is easy to leak in the edge area of the hollow part 00K, the light-blocking glue can shield the light of the film material such as the light guide plate 1031 in the backlight module 10 at the edge of the hollow part 00K, but it is difficult for the light-blocking glue to be located in the position where the backlight light is incident to the display panel 20. Therefore, the area cannot be displayed in the display mode, forming a black border. Although the space area occupied by the filled light-blocking glue is small, it can also affect the display effect of the full-screen display.

[0042] To solve the above problems, the backlight module 10 of the embodiment further comprises a light adjusting assembly 104, the light adjusting assembly 104 is arranged around the hollow part 00K, and in the direction X parallel to the light emitting surface of the display module 000, the light adjusting assembly 104 is located on the side of the light sensing element 30 facing the optical film 103, that is, the light adjusting assembly 104 is arranged at the position of the hollow part 00K edge where light is easy to leak, and is arranged between the light sensing element 30 and the optical film 103. The light adjusting assembly 104 of the embodiment comprises at least one light adjusting structure group 1040, and each light adjusting structure group 1040 comprises a first light adjusting film layer 1040A and a second light adjusting film layer 1040B arranged in a stack along the direction X parallel to the light emitting surface of the display module 000, that is, the stacking direction of the first light adjusting film layer 1040A and the second light adjusting film layer 1040B is different from the stacking direction of the optical film 103, and a plurality of optical films 103 are stacked along the direction Z perpendicular to the light emitting surface of the display module 000. The first light adjusting film layer 1040A and the second light adjusting film layer 1040B are stacked along the direction X parallel to the light emitting surface of the display module 000.

[0043] In each light adjusting structure group 1040 arranged at the position of the hollow part 00K edge where light is easy to leak of the embodiment, the refractive index of the first light adjusting film layer 1040A is greater than the refractive index of the second light adjusting film layer 1040B, and the first light adjusting film layer 1040A and the second light adjusting film layer 1040B with different refractive indexes form at least one pair of light adjusting film layers. A pair of light adjusting film layers, that is, a light adjusting structure group 1040, has a total reflection effect of light. When the light rays emitted from the light guide plate 1031 are transmitted to the position of the hollow part 00K edge where light is easy to leak, at least one light adjusting structure group 1040 at the position can form a total reflection interface, that is, when the light emitted from the light guide plate 1031 reaches the edge of the hollow part 00K, it can be totally reflected back to the light emitting surface 10E side of the backlight module 10. Thus, the light emitted from the light guide plate 1031 can be greatly reduced at the edge of the hollow part 00K, and the light leakage problem from the edge of the hollow part 00K to the light sensing element 30 can be improved. In the shooting mode, the shooting effect can be improved, and the imaging quality of the camera can be improved. In the display mode, the first light adjusting film layer 1040A and the second light adjusting film layer 1040B of at least one light adjusting structure group 1040 in the light adjusting assembly 104 are light-transmitting structures, not light-blocking structures, so they will not affect the display. Therefore, the light adjusting assembly 104 arranged at the position of the hollow part 00K edge where light is easy to leak can avoid light leakage, ensure shooting quality, and also ensure display quality, so as to balance good shooting quality and display quality.

[0044] It can be understood that the number of the light adjusting structure group 1040 included in the light adjusting assembly 104 is not specifically limited, and the light adjusting assembly 104 can include at least one light adjusting structure group 1040. In actual implementation, the number of the light adjusting structure group 1040 included in the light adjusting assembly 104 can be set according to the module space. The manufacturing materials of the first light adjusting film layer 1040A and the second light adjusting film layer 1040B of the light adjusting structure group 1040 are not specifically limited in the embodiment. The first light adjusting film layer 1040A can be silicon nitride (SiNx, the refractive index is about 1.82), and the second light adjusting film layer 1040B can be silicon oxide (SiO2, the refractive index is about 1.48). Only the refractive indexes of the two are different, and the two are non-opaque materials.

[0045] It should be noted that the light adjusting assembly 104 of the embodiment Figure 1 and Figure 2 The shape of the hollow part 00K is a circle, but is not limited to this shape. The shape of the hollow part 00K can also be other shapes, which are not limited in the embodiment. The specific structures of the backlight module 10 and the display panel 20 are not limited to the above structures. For example, the structures of the liquid crystal display device in the related art can be referred to for understanding, and details are not described herein.

[0046] In some optional embodiments, please refer to Figure 1 and Figure 4 , Figure 4 is Figure 1 Another cross-sectional structure diagram of the A-A' direction is shown in FIG. 13B. In the embodiment, the light adjusting assembly 104 includes N light adjusting structure groups 1040, and the N light adjusting structure groups 1040 are stacked along the direction X parallel to the light emitting surface of the display module 000. N is an integer greater than or equal to 25.

[0047] When the N light adjusting structure groups 1040 are stacked along the direction X parallel to the light emitting surface of the display module 000, one second light adjusting film layer 1040B is included between two adjacent first light adjusting film layers 1040A, and one first light adjusting film layer 1040A is included between two adjacent second light adjusting film layers 1040B.

[0048] The embodiment explains that the number of the light adjusting structure group 1040 included in the light adjusting assembly 104 can be set as more as possible. For example, the light adjusting assembly 104 includes N light adjusting structure groups 1040, N is an integer greater than or equal to 25, and the N light adjusting structure groups 1040 are stacked along the direction X parallel to the light emitting surface of the display module 000, to form a light adjusting assembly 104 with better total reflection effect. According to the research of the inventor, the light adjusting assembly 104 with total reflection function formed by periodically arranging high refractive index and low refractive index film layers in turn has a reflectivity wherein nH The high refractive index of the first light-adjusting film layer 1040A, n L The low refractive index of the second light-adjusting film layer 1040B, N is the number of light-adjusting structure groups 1040 included in the light-adjusting assembly 104; it can be known from the above formula that the greater the difference between the high refractive index of the first light-adjusting film layer 1040A and the low refractive index of the second light-adjusting film layer 1040B, the higher the reflectivity R%, and the more the number of light-adjusting structure groups 1040 included in the light-adjusting assembly 104, the higher the reflectivity R%. Therefore, the embodiment sets that the light-adjusting assembly 104 includes at least 25 light-adjusting structure groups 1040, that is, the light-adjusting assembly 104 includes 25 groups of first light-adjusting film layers 1040A and second light-adjusting film layers 1040B stacked to form the light-adjusting assembly 104, which is beneficial to further improve the total reflection effect of the light-adjusting assembly 104 at the edge of the hollow part 00K where light leakage is easy to occur, and thus the light leakage problem of the camera area can be further improved.

[0049] It can be understood that, under the condition that the module space is allowed, the more the number of light-adjusting structure groups 1040 included in the light-adjusting assembly 104, the better, as long as it does not affect the structural performance of the module itself, so as to maximize the reflectivity of the light-adjusting assembly 104 to light leakage and ensure the shooting quality of the module.

[0050] In some optional embodiments, please continue to refer to Figure 1 and Figure 4 In the embodiment, the thickness of the first light-adjusting film layer 1040A is D1 and the thickness of the second light-adjusting film layer 1040B is D2 along the direction X parallel to the light-out surface of the display module 000, wherein 120nm≤D1≤130nm and 120nm≤D2≤130nm.

[0051] The thickness D1 of the first light-adjusting film layer 1040A and the thickness D2 of the second light-adjusting film layer 1040B are the same along the direction X parallel to the light-out surface of the display module 000.

[0052] The embodiment explains that the number of the light adjusting structure groups 1040 included in the light adjusting assembly 104 can be set as more as possible, for example, the light adjusting assembly 104 includes N light adjusting structure groups 1040, N is an integer greater than or equal to 25, and the N light adjusting structure groups 1040 are stacked along the direction X parallel to the light emitting surface of the display module 000 to form the light adjusting assembly 104 with better total reflection effect. At this time, the thickness D1 of the first light adjusting film layer 1040A in each light adjusting structure group 1040 and the thickness D2 of the second light adjusting film layer 1040B can be substantially the same, for example, 120nm≤D1≤130nm, 120nm≤D2≤130nm, preferably D1 can be about 125nm, and D2 can be about 125nm (the thickness of D1 and D2 is generally 1 / 4 wavelength of incident light, assuming that the wavelength of visible light is about 500nm, the thickness D1 of the first light adjusting film layer 1040A with high refractive index can be selected to be about 125nm, and the thickness D2 of the second light adjusting film layer 1040B with low refractive index can be selected to be about 125nm), so that the sum of the thicknesses of one light adjusting structure group 1040 along the direction X parallel to the light emitting surface of the display module 000 is about 250nm, when the number of the light adjusting structure groups 1040 included in the light adjusting assembly 104 is at least 25, the total thickness of the light adjusting assembly 104 can be at least 6.25μm, at this time, according to the test of the inventor, the total reflection effect can basically reach the expectation, and when the number of the light adjusting structure groups 1040 included in the light adjusting assembly 104 is further more, the total reflection effect can be further improved to reflect more light leakage through the light adjusting assembly 104, and further improve the shooting quality of the module.

[0053] As shown in Figure 5 , Figure 5 is the reflectivity simulation curve diagram after using the light adjusting assembly shown in Figure 4 , the inventor of the application adopts the light adjusting assembly 104 including 25 light adjusting structure groups 1040 stacked, the thickness D1 of the first light adjusting film layer 1040A in each light adjusting structure group 1040 is 125nm, the thickness D2 of the second light adjusting film layer 1040B is 125nm, the first light adjusting film layer 1040A adopts silicon nitride SiNx, and the second light adjusting film layer 1040B adopts silicon oxide SiO2, the reflectivity of the incident light of full wave band (400-700nm, wavelength range of full wave band of visible light) to the light adjusting assembly 104 with the above structure under different viewing angles is simulated and tested, Figure 5 , the abscissa represents the wavelength of the incident light, the ordinate represents the reflectivity, and a plurality of curves represent different viewing angles, and the test results are shown in Table One as follows:

[0054] Table One:

[0055] Polar angle Mean reflectance R% over the full wavelength range 0° 12.9 10° 13.0 20° 13.2 30° 12.4 40° 12.8 50° 20.4 60° 31.0 70° 43.8 80° 63.5

[0056] From the above table 1, the average reflectivity of incident light of different wavelengths through the light adjusting assembly 104 of the above structure at different polar angles can be shown in the second column of the above table, such as the average reflectivity R% of the full waveband is 12.9% at the normal viewing angle (i.e. the polar angle is 0°), and the average reflectivity R% of the full waveband is 63.5% at the large viewing angle (such as the oblique viewing angle with the polar angle of 80°). It can be seen that the reflectivity of light gradually increases as the viewing angle increases, and even at the normal viewing angle with the minimum reflectivity, the light adjusting assembly 104 with 25 light adjusting structure assemblies 1040 stacked and the light adjusting film layer with a thickness of 125 nm can meet the expected effect of light leakage reflection.

[0057] It can be understood that the first light adjusting film layer 1040A and the second light adjusting film layer 1040B in the embodiment can be made by a coating process such as a PVD (Physical Vapor Deposition, physical vapor deposition) sputtering process. The thicknesses of the first light adjusting film layer 1040A and the second light adjusting film layer 1040B made by the process are basically the same, so that the thicknesses of the film layers in the light adjusting assembly 104 can be accurately controlled.

[0058] In some optional embodiments, please continue to refer to Figure 1 and Figure 4 In the embodiment, the backlight module 10 includes a side plate 105, the side plate 105 is arranged around the hollow part 00K, and the side plate 105 is located between the light adjusting assembly 104 and the photosensitive element 30 in the direction X parallel to the light emitting surface of the display module 000.

[0059] The back plate 101 and the side plate 105 form a space for accommodating the backlight source 102, the plurality of optical film pieces 103, and the light adjusting assembly 104.

[0060] The embodiment explains that the backlight module 10 can further include the side plate 105, and the side plate 105 and the back plate 101 can be integrally formed to form a space for accommodating the backlight source 102, the plurality of optical film pieces 103, and the light adjusting assembly 104. For example, the side plate 105 and the back plate 101 can be integrally formed into an iron frame structure, the side plate 105 is arranged around the hollow part 00K, and the side plate 105 is located between the light adjusting assembly 104 and the photosensitive element 30 in the direction X parallel to the light emitting surface of the display module 000. The height of the side plate 105 can shield the light of the hollow part 00K, so as to further ensure the stability of the module and reduce the possibility of light leakage around the hollow part 00K.

[0061] In some optional embodiments, please refer to Figure 1 and Figure 6 , Figure 6 is Figure 1Another cross-sectional structure schematic view of A-A' direction, in this embodiment, along the direction Z perpendicular to the light-out surface of the display module 000, the light modulation assembly 104 includes a first end 104A away from the back plate 101 side, and the plurality of optical films 103 includes a first surface 103A away from the back plate side; the distance H1 from the first end 104A to the back plate 101 is greater than the distance H2 from the first surface 103A to the back plate 101.

[0062] This embodiment explains that along the direction Z perpendicular to the light-out surface of the display module 000, the light modulation assembly 104 includes a first end 104A away from the back plate 101 side, and the plurality of optical films 103 includes a first surface 103A away from the back plate side, the first surface 103A can be understood as the upper surface of an optical film closest to the display panel 10 in the plurality of optical films 103, for example, the one closest to the display panel 10 in the plurality of optical films 103 is a brightness enhancement film, then the first surface 103A is the upper surface of the brightness enhancement film, for example, the one closest to the display panel 10 in the plurality of optical films 103 is other film, then the first surface 103A is the upper surface of the film, this embodiment does not limit this, as long as the first surface 103A is the upper surface of an optical film closest to the display panel 10 in the plurality of optical films 103. This embodiment sets the distance H1 from the first end 104A to the back plate 101 to be greater than the distance H2 from the first surface 103A to the back plate 101, so that the height of the light modulation assembly 104 can be higher than the thickness of the laminated plurality of optical films 103, the light modulation assembly 104 has a region exceeding the first surface 103A, which can further ensure that all the light leakage of the backlight film material can be reflected by the light modulation assembly 104, avoiding the gap between the backlight module 10 and the display panel 20 when the first end 104A is at the same height as the first surface 103A, which is easy to make the light leakage of the backlight film material exit from the gap to the camera assembly of the hollow part 00K, causing residual light leakage.

[0063] In some optional embodiments, please refer to Figure 1 and Figure 7 , Figure 7 is Figure 1 Another cross-sectional structure schematic view of A-A' direction, in this embodiment, the first surface 103A is filled with an optical adhesive layer 40 between the display panel 20.

[0064] This embodiment explains that when the light modulation assembly 104 has a region exceeding the first surface 103A, which can further ensure that all the light leakage of the backlight film material can be reflected by the light modulation assembly 104, the optical adhesive layer 40 can be filled between the first surface 103A and the display panel 20, the optical adhesive layer 40 is transparent adhesive, which can not affect the light-out of the backlight module 10, and can improve the stability of the entire module.

[0065] In some optional embodiments, please refer to Figure 1 , Figure 7 and Figure 8 , Figure 9 , Figure 8 is Figure 7 a local enlarged structural schematic view of the J1 region in Figure 9 is Figure 8 a partial light path diagram of the light incident into the light modulation assembly in In the present embodiment, along the direction Z perpendicular to the light-out surface of the display module 000, the light modulation assembly 104 away from the back plate 101 side includes a plurality of grooves 104K.

[0066] The present embodiment explains that along the direction Z perpendicular to the light-out surface of the display module 000, the light modulation assembly 104 includes a first end 104A away from the back plate 101, and the plurality of grooves 104K can be formed on the side of the light modulation assembly 104 away from the back plate 101 by polishing the first end 104A of the light modulation assembly 104, so that the surface of the side of the light modulation assembly 104 away from the back plate 101 is a concave-convex surface, which is beneficial to strengthen the scattering of the total reflection light in the light modulation assembly 104 (such as Figure 9 the light path schematic with arrows in ), so as to avoid the total reflection light leaked into the light modulation assembly 104 directly gathered and emitted from the first end 104A of the light modulation assembly 104 to the display panel 20, affecting the display quality of the display panel 10 in the region.

[0067] It can be understood that the present embodiment does not limit the shape of the plurality of grooves 104K provided on the side of the light modulation assembly 104 away from the back plate 101, which can be irregular groove shape, as long as it can achieve light scattering through the structure of the groove 104K.

[0068] In some optional embodiments, please refer to Figure 1 and Figure 10 , Figure 10 is Figure 1 another cross-sectional structural schematic view of the A-A' direction in In the present embodiment, along the direction Z perpendicular to the light-out surface of the display module 000, the light modulation assembly 104 away from the back plate 101 side includes a diffusion part 106.

[0069] This embodiment explains that in the display module 000, the first end 104A of the dimming component 104 disposed around the hollow portion 00K can be provided with a diffuser 106. That is, along the direction Z perpendicular to the light-emitting surface of the display module 000, the side of the dimming component 104 away from the back plate 101 includes the diffuser 106. The diffuser 106 can be a structure made of a high haze material, such as a structure doped with diffusion particles. The diffuser 106 can blur bright lines and avoid bright lines that may appear when the total internal reflection light in the dimming component 104 is emitted from the first end 104A of the dimming component 104. This helps to ensure the brightness uniformity of the area above the dimming component 104 and other areas, thereby improving the light emission uniformity on the light-emitting surface 10E side of the entire backlight module 10 and improving the display quality.

[0070] It is understood that this embodiment does not limit the specific material of the diffusion section 106, only requiring that it be a high-haze material that can diffuse bright lines.

[0071] Optional, please refer to the reference. Figure 1 , Figure 10 and Figure 11 , Figure 11 yes Figure 10 A partially enlarged structural schematic diagram of the J2 region. In this embodiment, the orthographic projection of the diffuser 106 onto the plane of the back plate 101 covers the orthographic projection of the dimming assembly 104 onto the plane of the back plate 101.

[0072] This embodiment explains that the orthographic projection of the diffuser 106, which plays a role in blurring bright lines, onto the plane of the back panel 101 covers the orthographic projection of the dimming assembly 104 onto the plane of the back panel 101. This allows the width W1 of the diffuser 106 in the direction X parallel to the light-emitting surface of the display module 000 to be greater than or equal to the width W2 of the dimming assembly 104 in the same direction. This ensures that the first end 104A of the entire dimming assembly 104 can be covered by the diffuser 106 above it, thereby further improving the brightness uniformity above the dimming assembly 104 and other areas, which is more conducive to improving display quality.

[0073] In some alternative embodiments, please refer to Figure 12 , Figure 12 This is a schematic diagram of the planar structure of the display device provided in the embodiment of the present invention. The display device 111 provided in this embodiment includes the display module 000 provided in the above embodiment of the present invention. Figure 12The embodiment only takes the mobile phone as an example to describe the display device 111, and it can be understood that the display device 111 provided by the embodiment of the present application can be a computer, a television, a vehicle-mounted display device or other display devices 111 with a display function, and the present application does not make specific limitations thereon. The display device 111 provided by the embodiment of the present application has the beneficial effects of the display module 000 provided by the embodiment of the present application, and specific descriptions can be referred to the specific description of the display module 000 in the above embodiments, which will not be described here again.

[0074] It can be known from the above embodiment that the display module and the display device provided by the present application at least achieve the following beneficial effects:

[0075] The display module provided by the present application comprises a backlight module, a display panel and a photosensitive element, the photosensitive element is located on a side away from a light-out surface of the backlight module, and the photosensitive element can be a camera assembly. The hollow part of the display module at least penetrates the backlight module, and the photosensitive element is fixedly arranged in the hollow part. In a non-display mode, the camera assembly works to take a picture, while in a display mode, the photosensitive element of the camera assembly does not work, and the display module displays a full-screen picture. The backlight module further comprises a light-adjusting assembly, the light-adjusting assembly is arranged around the hollow part, the light-adjusting assembly is arranged at a position of the hollow part edge between the photosensitive element and the optical film sheet which is easy to leak light, the light-adjusting assembly comprises at least one light-adjusting structure group, each light-adjusting structure group comprises a first light-adjusting film layer and a second light-adjusting film layer arranged in a stack, the first light-adjusting film layer and the second light-adjusting film layer with different refractive indexes form at least one pair of light-adjusting film layers, and one pair of light-adjusting film layers, i.e. one light-adjusting structure group, has a total reflection effect of light. When the light rays emitted from the light guide plate are transmitted to the position of the hollow part edge which is easy to leak light, at least one light-adjusting structure group at the position can form a total reflection interface, i.e. the light emitted from the light guide plate can be totally reflected back to the side of the light-out surface of the backlight module when reaching the edge of the hollow part, thereby the light-out of the light guide plate can be greatly reduced at the edge of the hollow part, the light leakage problem of the edge of the hollow part towards the photosensitive element is improved, the shooting effect can be improved in the shooting mode, and the imaging quality of the camera is improved. In the display mode, the first light-adjusting film layer and the second light-adjusting film layer of at least one light-adjusting structure group in the light-adjusting assembly are light-transmitting structures and not light-blocking structures, so they will not affect the display, and the display quality of the full screen can be ensured. Therefore, the light-adjusting assembly arranged at the position of the edge of the hollow part which is easy to leak light can avoid light leakage, ensure the shooting quality, and also ensure the display quality, thereby the good shooting quality and display quality can be achieved.

[0076] While certain specific embodiments of the application have been described in detail herein for the purposes of exemplification and to provide a thorough and enabling disclosure, it will be understood that the application is not limited to the particular embodiments described. Any modifications of the methods and materials described herein, which come within the scope and spirit of the application, are to be considered within the scope of the application. The scope of the application is to be determined by the claims appended hereto, which are to be construed in accordance with the principles of patent law.

Claims

1. A display module, characterized by The display module comprises: a backlight module and a display panel arranged oppositely, the display panel being located on one side of a light exit surface of the backlight module; the display module comprises a hollow part, the hollow part penetrating at least the backlight module in a direction perpendicular to the light exit surface of the display module, and a photosensitive element being arranged in the hollow part; the backlight module comprises at least a back plate, a backlight source located on a side of the back plate facing the display panel, and a plurality of optical films, the plurality of optical films being arranged in a stacking manner in a direction perpendicular to the light exit surface of the display module, and the plurality of optical films comprising at least a light guide plate; the backlight module further comprises a light adjusting assembly, the light adjusting assembly being arranged around the hollow part and located on a side of the photosensitive element facing the optical films in a direction parallel to the light exit surface of the display module; the light adjusting assembly comprises at least one light adjusting structure group, each light adjusting structure group comprising a first light adjusting film layer and a second light adjusting film layer arranged in a stacking manner in the direction parallel to the light exit surface of the display module; a refractive index of the first light adjusting film layer is greater than a refractive index of the second light adjusting film layer; the light adjusting structure group has a total reflection effect on light; the light adjusting assembly comprises N light adjusting structure groups, the N light adjusting structure groups being arranged in a stacking manner in the direction parallel to the light exit surface of the display module, and N being an integer greater than or equal to 25; the backlight module comprises a side plate, the side plate being arranged around the hollow part and located between the light adjusting assembly and the photosensitive element in the direction parallel to the light exit surface of the display module.

2. The display module of claim 1, wherein, one second light adjusting film layer is arranged between two adjacent first light adjusting film layers, and one first light adjusting film layer is arranged between two adjacent second light adjusting film layers.

3. The display module of claim 1, wherein, in the direction parallel to the light exit surface of the display module, a thickness of the first light adjusting film layer is D1, and a thickness of the second light adjusting film layer is D2, wherein 120 nm≤D1≤130 nm and 120 nm≤D2≤130 nm.

4. The display module of claim 1, wherein, in the direction parallel to the light exit surface of the display module, the thickness of the first light adjusting film layer is the same as the thickness of the second light adjusting film layer.

5. The display module of claim 1, wherein: the back plate and the side plate form a space for accommodating the backlight source, the plurality of optical films, and the light adjusting assembly.

6. The display module of claim 1, wherein: in the direction perpendicular to the light exit surface of the display module, the light adjusting assembly comprises a first end away from the back plate, and the plurality of optical films comprise a first surface away from the back plate; a distance from the first end to the back plate is greater than a distance from the first surface to the back plate.

7. The display module of claim 6, wherein, an optical adhesive layer is filled between the first surface and the display panel.

8. The display module of claim 1, wherein, in the direction perpendicular to the light exit surface of the display module, a side of the light adjusting assembly away from the back plate comprises a plurality of grooves.

9. The display module of claim 1, wherein, in the direction perpendicular to the light exit surface of the display module, a side of the light adjusting assembly away from the back plate comprises a diffusion part.

10. The display module of claim 9, wherein: The diffusion portion covers a normal projection of the light adjusting assembly on a plane where the back plate is located.

11. A display device, characterized by comprising: The display module comprises the display module according to any one of claims 1-10.

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