CN111999937A

CN111999937A - Backlight module and display device

Info

Publication number: CN111999937A
Application number: CN202010898251.1A
Authority: CN
Inventors: 杜欣航
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-11-27
Anticipated expiration: 2040-08-31
Also published as: CN111999937B

Abstract

The application discloses backlight unit and display device relates to and shows technical field, includes: the reflecting film is positioned between the back plate and the light guide plate along the direction vertical to the back plate, and at least one through hole is formed through the back plate along the direction vertical to the back plate; at least one vacuumizing structure is arranged around the through hole along the direction vertical to the back plate, and the vacuumizing structure is positioned on one side of the back plate far away from the reflecting film; the interior of the vacuumizing structure is of a hollow structure and is provided with a piston and a gasket, the gasket is in contact with the reflecting film along the direction perpendicular to the back plate, and the piston is positioned on one side, far away from the reflecting film, of the gasket. This application is through setting up the evacuation structure on the backplate with adopting, and the evacuation structure is located around the through-hole, is in adsorption state when the evacuation structure under, makes the reflectance coating adsorb on the backplate, promotes the planarization of backlight unit rete, is favorable to avoiding leading to taking place newton ring or interference line because backlight unit rete unevenness.

Description

Backlight module and display device

Technical Field

The application relates to the technical field of display, in particular to a backlight module and a display device.

Background

A TFT-LCD (Thin Film Transistor-Liquid Crystal Display) is used as a flat panel Display device, and has the features of small size, low power consumption, no radiation, relatively low manufacturing cost, and the like, so that it is increasingly applied to the field of high performance Display.

At present, the technology of underscreen fingerprint identification applied in the LCD is becoming more and more mature, wherein the technology of underscreen fingerprint identification includes direct type fingerprint identification and side type fingerprint identification. When carrying out fingerprint identification, infrared light emitter can send infrared light signal, and this signal can pass the panel to by finger reflection, scattering or transmission form the fingerprint detection light that carries fingerprint information, the fingerprint detects the light and passes the panel, and blooming, light guide plate and reflectance coating among the backlight unit transmit to the sensor, make sensor collection fingerprint signal and carry out fingerprint identification. Because the blooming, light guide plate and reflectance coating are superimposed diaphragm, use at display device, test or transport state under, relative displacement takes place easily for these retes, extrusion deformation, it is inhomogeneous to lead to the contact between each rete, when fingerprint detection light sees through the rete in a poor light, newton ring can appear, bad demonstration such as interference line, in addition, the position that the sensor corresponds backlight unit needs the trompil, and because each rete unevenness in a poor light, the rete contact phenomenon such as inhomogeneous of a poor light, can influence the sensor equally and receive fingerprint information.

Therefore, it is highly desirable to improve the backlight module to overcome the problems of uneven backlight film and non-uniform contact of the film that may cause newton's rings or interference patterns.

Disclosure of Invention

In view of this, the present application provides a backlight module and a display device, which employ a vacuum structure disposed on a back plate, and the vacuum structure is located around a through hole, so that when the vacuum structure is in an adsorption state, a reflective film is adsorbed on the back plate, thereby avoiding a phenomenon of newton ring or interference with a texture of the backlight module due to unevenness of a film layer.

In order to solve the technical problem, the following technical scheme is adopted:

in a first aspect, the present application provides a backlight module, which includes:

the reflecting film is positioned between the back plate and the light guide plate along the direction vertical to the back plate, and at least one through hole is formed through the back plate along the direction vertical to the back plate;

at least one vacuumizing structure is arranged around the through hole along the direction vertical to the back plate, and the vacuumizing structure is positioned on one side of the back plate far away from the reflecting film;

the interior of the vacuumizing structure is of a hollow structure and is provided with a piston and a gasket, the gasket is in contact with the reflecting film along the direction perpendicular to the back plate, and the piston is positioned on one side, far away from the reflecting film, of the gasket.

In a second aspect, the present application further provides a display device, which includes a backlight module and a display panel, where the backlight module is the backlight module provided in the present application.

Compared with the prior art, the backlight module and the display device provided by the invention at least realize the following beneficial effects:

the application provides a backlight unit and display device adopts and sets up the evacuation structure around the through-hole of backplate, and the inside cavity that is of evacuation structure, and is provided with gasket and piston, and the piston is used for discharging the inside air of evacuation structure, makes the evacuation structure be in adsorption state, and thereby when the gasket prevented the evacuation structure be in adsorption state, thereby extrudes the planarization that the indenture influences the reflectance coating with the reflectance coating. The introduction of the vacuumizing structure enables the back plate and the reflecting film to be tightly attached together, the smoothness of the reflecting film is guaranteed, when the reflecting film keeps smooth, other film layers in the backlight module can also keep smooth, and further the phenomenon of Newton rings or interference fringes caused by the unevenness of the film layers in the backlight module is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic diagram illustrating a structure of a backlight module in the prior art in which contact between films is not uniform;

FIG. 2 is a schematic structural diagram of a Newton ring provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram illustrating a positional relationship between a vacuum structure and a through hole according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of an evacuation structure provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of another vacuum structure provided in the embodiments of the present application;

FIG. 7 is a top view of an evacuation structure provided in accordance with an embodiment of the present application;

FIG. 8 is a top view of an evacuation structure and gasket provided in accordance with an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

fig. 10 is a cross-sectional view of the display device along a-a' of the embodiment shown in fig. 9.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result. Furthermore, the term "coupled" is intended to encompass any direct or indirect electrical coupling. Thus, if a first device couples to a second device, that connection may be through a direct electrical coupling or through an indirect electrical coupling via other devices and couplings. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims. The same parts between the embodiments are not described in detail.

Fig. 1 is a schematic structural diagram illustrating uneven contact between films in a backlight module according to the prior art, and fig. 2 is a schematic structural diagram illustrating a newton ring according to the prior art. Referring to fig. 1 and 2, in the prior art, when the backlight module is in use, test or transportation, the film layers in the backlight module are easily subjected to relative displacement and extrusion deformation, so that the film layers in the backlight module are not in uniform contact, especially wrinkles are formed between the reflective film 1 and the light guide plate 2 in the backlight film layer, and the film layers in the backlight module are in non-uniform contact and wrinkles, as shown in fig. 1, when light passes through the wrinkled film layers, the light interferes with each other to form interference fringes, so that a newton ring phenomenon is caused, as shown in fig. 2, the generation of the newton ring interferes with fingerprint identification, so that the accuracy of fingerprint identification is reduced.

In view of this, the application provides a backlight module and display device, adopts to set up evacuation structure on the backplate, and evacuation structure is located around the through-hole, and when evacuation structure is in adsorption state, make the reflectance coating adsorb on the backplate, avoids backlight module because of the rete emergence newton ring that the rete unevenness leads to or disturb the line phenomenon.

The following detailed description is to be read in connection with the drawings and the detailed description.

Fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the present application, please refer to fig. 3, in which a backlight module 100 provided in the present application includes:

the backlight module comprises a back plate 10, a reflective film 20 and a light guide plate 30, wherein the reflective film 20 is positioned between the back plate 10 and the light guide plate 30 along a direction perpendicular to the back plate 10, and at least one through hole 11 is formed through the back plate 10 along the direction perpendicular to the back plate 10.

Referring to fig. 3, at least one vacuum structure 40 is disposed around the through hole 11 along a direction perpendicular to the back plate 10, and the vacuum structure 40 is located on a side of the back plate 10 away from the reflective film 20.

With continued reference to fig. 3, the interior of the vacuum structure 40 is a hollow structure, and is provided with a piston 41 and a gasket 42, the gasket 42 is in contact with the reflective film 20 along a direction perpendicular to the back plate 10, and the piston 41 is located on a side of the gasket 42 away from the reflective film 20.

It should be noted that the embodiment shown in fig. 3 only schematically shows a relative position relationship diagram among the back plate 10, the reflective film 20, the light guide plate 30 and the through hole 11, and does not represent an actual size, wherein the embodiment shown in fig. 3 only schematically shows a relative position relationship diagram between the vacuum structure 40 and the through hole 11, and does not represent an actual size, and of course, the distance between the vacuum structure 40 and the through hole 11 is not limited in this application, as long as the vacuum structure 40 can achieve the purpose of absorbing air well.

Specifically, please refer to fig. 3, the backlight module 100 of the present application includes a back plate 10, a reflective film 20 and a light guide plate 30, which are stacked, wherein the reflective film 20 is located between the back plate 10 and the light guide plate 30, a hole is formed in the back plate 10 to form a through hole 11, the through hole 11 is surrounded by the through hole 11, a vacuum structure 40 is disposed on a side of the back plate 10 away from the reflective film 20, and the vacuum structure 40 is used for absorbing air. The vacuum structure 40 is a hollow shell, a piston 41 and a gasket 42 are arranged in the shell, the gasket 42 is in contact with the reflective film 20, the piston 41 is located on one side of the gasket 42 away from the reflective film 20, and the gasket 42 separates the piston 41 and the reflective film 20, so that the phenomenon that when the vacuum structure 40 is in an adsorption state, the reflective film 20 is dented is avoided, and the flatness of the reflective film 20 is affected. This application encircles and sets up at least one evacuation structure 40 around through-hole 11, evacuation structure 40 is under being in adsorption state, the piston 41 of the inside setting of pull evacuation structure 40 promptly, the inside air escape of evacuation structure 40, and the inside and the reflectance coating 20 of evacuation structure 40 communicate with each other, can make reflectance coating 20 hug closely with backplate 10, avoid because of the rete unevenness in backlight unit 100, phenomenons such as rete contact is inhomogeneous, the backlight unit 100 that leads to takes place Newton's ring or disturb the line phenomenon.

It should be noted that the backlight module 100 provided in the present application may further include other film layer structures besides the back plate 10, the reflective film 20 and the light guide plate 30, for example, a plurality of optical film layers may be further disposed on a side of the light guide plate away from the back plate, such as a lower diffusion sheet, a lower prism sheet, an upper diffusion sheet, and a light shielding tape. This application introduces evacuation structure 40 in backlight unit, evacuation structure 40 is inside to be hollow structure and be provided with piston 41 and gasket 42, gasket 42 is used for avoiding evacuation structure 40 to be in adsorption state, extrude the dent with reflectance coating 20, influence the planarization of reflectance coating, piston 41 is used for discharging the inside air of evacuation structure 40, make backplate and reflectance coating tightly attached together, the planarization of reflectance coating has been guaranteed, when the reflectance coating keeps leveling, other retes in the backlight unit also can keep leveling, therefore avoid leading to making the rete in the backlight unit take place newton ring or disturb the line phenomenon because backlight unit rete unevenness.

Optionally, fig. 4 is a schematic structural view illustrating a positional relationship between the vacuum structure and the through hole provided in the embodiment of the present application, and fig. 5 is a schematic structural view illustrating the vacuum structure provided in the embodiment of the present application, please refer to fig. 4, the back plate 10 further includes a first region 12, the first region 12 surrounds the through hole 11, and the vacuum structure 40 is located in the first region 12.

Referring to fig. 5 in conjunction with fig. 3, the vacuum structure 40 is a groove formed by stamping the backplate 10.

It should be noted that the embodiment shown in fig. 4 only schematically shows a relative position relationship among the through hole 11, the first region 12 and the back plate 10, and does not represent actual dimensions. The embodiment shown in fig. 4 only schematically shows the case that one evacuation structure 40 is provided, but of course, in some other embodiments of the present application, 3 or 4 evacuation structures 40 may be provided, and the evacuation structures 40 are uniformly arranged around the through holes 11. The embodiment shown in fig. 4 only schematically shows one structural diagram of the vacuum structure 40, and in some other embodiments of the present application, the vacuum structure 40 may also have other forms, which are not limited in the present application.

Specifically, with reference to fig. 4 to 5 and fig. 3, the back plate 10 located around the through hole 11 is divided into a first area 12, the first area 12 uses the center of the through hole 11 as the center of a circle and a certain distance as a circle of radius, and the vacuum structure 40 is located in the first area 12 and disposed around the first area 12. The vacuumizing structure 40 can be formed by the punching backboard 10, the backboard 10 is made of iron, the punching backboard 10 is adopted to form the vacuumizing structure 40, the manufacturing process of the process is saved most, a groove is formed behind the punching backboard 10, and when air in the groove is adsorbed by the piston 41, a vacuum environment is formed in the groove, so that the film layers in the backlight module 100 are tightly attached together, and the formation of Newton rings is overcome.

It should be noted that, with continued reference to fig. 5, the vacuum structure 40 is configured as a groove, which meets both the requirement of placing the piston 41 and the gasket 42 and the requirement of the space required for drawing the piston 41.

It should be further noted that the first regions 12 mentioned in the present application are disposed in one-to-one correspondence with the through holes 11, and optionally, at least one vacuum structure 40 is disposed in each first region 12 corresponding to each through hole 11; optionally, the number of the vacuum structure 40 corresponding to each through hole 11 is the same, so as to ensure that the vacuum absorption capacity of the vacuum structure 40 to the corresponding position of each through hole 11 is equivalent, which is beneficial to ensuring the force uniformity of the reflective film 20. Optionally, the orthographic projection of the vacuum structure 40 on the plane of the back plate 10 is uniformly arranged, so as to further ensure the stress uniformity of the reflective film 20 and further ensure the flatness of the reflective film 20.

Optionally, with continuing reference to fig. 5 and with reference to fig. 3, the height of the groove is 0.3mm to 0.5mm in a direction perpendicular to the back plate 10.

Specifically, please refer to fig. 5 and refer to fig. 3, the height of the groove is h, h may be 0.3mm, 0.4mm or 0.5mm along the direction perpendicular to the back plate 10, the height of the groove can meet the requirement of the piston 41 and the gasket 42, the vacuum structure 40 is configured as a groove, and structurally meets the requirement of placing the piston 41 in the vacuum structure 40 to adsorb air, when the vacuum structure 40 is in an adsorption state, the film layer in the backlight module 100 is flat, which is beneficial to overcoming the newton ring phenomenon. In addition, if the height of the groove is too large, the thickness of the backlight assembly 100 is affected, and the higher the groove is, the greater the pulling force to the drawing piston 41 is.

Optionally, with continuing reference to fig. 3 and with reference to fig. 5, the groove includes a first opening 43 and a second opening 44 along a direction perpendicular to the back plate 10, and the distance between the second opening 44 and the reflective film 20 is greater than the distance between the first opening 43 and the reflective film 20.

With continued reference to fig. 3 and with reference to fig. 5, an orthographic projection of the first opening 43 in the direction perpendicular to the back plate 10 overlaps with an orthographic projection of the second opening 44 in the direction perpendicular to the back plate 10.

It should be noted that, in a direction perpendicular to the back plate 10 as shown in fig. 5, the vertical distance from the first opening 43 to the second opening 44 is the height of the groove.

Specifically, with reference to fig. 3 and fig. 5, along a direction perpendicular to the back plate 10, a side of the groove close to the reflective film 20 is a first opening 43, and a side of the groove away from the reflective film 20 is a second opening 44, optionally, the shapes of the first opening 43 and the second opening 44 may be the same or different, and the application is not limited in any way. The first opening 43 and the second opening 44 are communicated with each other, and in a direction perpendicular to the back plate 10, orthographic projections of the first opening 43 and the second opening 44 are at least partially overlapped, and the piston 41 and the gasket 42 are arranged between the first opening 43 and the second opening 44, so that the distance and the space between the first opening 43 and the second opening 44 need to meet the size of the piston 41 and the gasket 42, the piston 41 and the gasket 42 can be placed, and the structure required for vacuumizing in the groove is realized.

Alternatively, fig. 6 is another schematic structural diagram of the vacuum structure provided in the embodiment of the present application, fig. 7 is a top view of the vacuum structure provided in the embodiment of the present application, please refer to fig. 6 to 7, and the first opening 43 and the second opening 44 are circular, rectangular, square, or triangular.

Please refer to fig. 5 of the present application, the embodiment shown in fig. 5 only schematically illustrates a case where the cross section of the vacuum structure 40 is a trapezoid, and in some other embodiments of the present application, other shapes may also be embodied, for example, please refer to a case where the cross section of the vacuum structure 40 in fig. 6 is a square, the embodiment shown in fig. 6 only schematically illustrates a structural diagram where the first opening 43 and the second opening 44 of the vacuum structure 40 have the same shape and size, and the shape of the first opening 43 and the second opening 44 is a square, which does not represent actual sizes. The embodiment shown in fig. 7 only schematically shows a structural diagram in which the first opening 43 and the second opening 44 of the vacuum structure 40 have the same shape and size, and the shape of the first opening 43 and the second opening 44 is triangular and does not represent actual dimensions.

Specifically, please continue to refer to fig. 6 to 7, the shape of the vacuum structure 40 of the present application may be a rectangular parallelepiped groove, a cube groove, a pyramid groove, or a cylindrical groove, which is not limited in the present application, as long as the piston 41 can be placed, so that the film in the backlight module 100 (the backlight module in fig. 3) is flat and the film is in uniform contact, thereby avoiding the phenomenon of newton ring or texture interference.

Optionally, with continued reference to fig. 3 and with reference to fig. 4 to 5, a gasket 80 is disposed on the back plate 10 and around the first opening 43, and the height of the gasket 80 is 0.05mm to 0.1mm along a direction perpendicular to the back plate 10.

Specifically, with reference to fig. 3 and fig. 4 to 5, an annular gasket 80 is disposed on the back plate 10 around the first opening 43 of the vacuum structure 40, as shown in fig. 4, the annular gasket 80 enables the first opening 43 of the vacuum structure 40 to form a closed space between the back plate 10 and the reflective film 20, so as to avoid that the vacuum structure 40 needs a stronger absorption force due to a gap between the back plate 10 and the reflective film 20 when the vacuum structure 40 is in an absorption state. The height d, d of the gasket 80 is 0.05 mm-0.1 mm along the direction perpendicular to the back plate 10, optionally, the height of the gasket 80 can be 0.07mm or 0.08mm, and the gasket 80 is located on one side of the back plate 10 close to the reflective film 20, the gasket 80 can block air from entering the hollow interior of the vacuum structure 40 from the through hole 11, so as to influence the pressure inside the vacuum structure 40, and in addition, the gasket 80 can simultaneously enable a gap to exist between the reflective surface and the back plate 10. When the height of the gasket 80 is less than 0.05mm, the effect of blocking air from entering the vacuum structure 40 from the through hole 11 is not obvious, and the pressure inside the vacuum structure 40 is still affected; when the height of the gasket 80 is greater than 0.01mm, the thickness of the backlight module 100 is increased, and the material is wasted, so that the height of the gasket 80 is set within the range of 0.05mm to 0.1mm, and the technical effect of the gasket 80 is optimized.

Alternatively, with continued reference to fig. 3, the gasket 80 is formed by stamping the backplate 10; or, the gasket 80 is adhered to the back plate 10, and the gasket 80 is made of foam rubber or a PC plate.

Specifically, with reference to fig. 3, the gasket 80 is formed by using the back plate 10 at the periphery of the stamping and vacuumizing structure 40, the material of the back plate 10 is iron, and the gasket 80 is formed by stamping, which is the most process-saving manufacturing process, in addition, the gasket 80 can be adhered to the back plate 10, and the adhered gasket 80 can be made of foam rubber or a PC board, so that the contact position between the gasket 80 and the reflective film 20 does not form an indentation, which affects the reflective film 20. No matter the gasket 80 is formed by stamping the back plate 10, or the gasket 80 is additionally adhered to form, the gasket 80 can prevent air from entering the hollow interior of the vacuum structure 40 from the through hole 11, so that the pressure of the vacuum structure 40 is prevented from being influenced, and the adsorption capacity of the vacuum structure 40 is strongest.

Alternatively, fig. 8 is a top view of the vacuuming structure and the gasket provided in the embodiment of the present application, please refer to fig. 8 in combination with fig. 3, wherein the gasket 80 includes a first surface 81 along a direction perpendicular to the back plate 10, the first surface 81 is in contact with the reflective film 20, and the first surface 81 is a rough surface.

It should be noted that the embodiment shown in fig. 8 only schematically shows a relative position relationship between the vacuum structure 40 and the first surface 81, and does not represent actual dimensions.

Specifically, referring to fig. 8 and referring to fig. 3, along a direction perpendicular to the back plate 10, one side of the gasket 80 close to the reflective film 20 includes a first surface 81, the first surface 81 contacts the reflective film 20, and the first surface 81 is a rough surface, and the first surface 81 is processed by a certain process to form a texture on the first surface 81, so that the first surface 81 with the texture can increase the friction between the first surface 81 and the reflective film 20, thereby preventing the sliding between the first surface 81 and the reflective film 20.

Optionally, with reference to fig. 3, the piston 41 is made of acrylic or foam or a PET film with optical properties.

It should be noted that PET is an abbreviation of polyethylene terephthalate, and the main material of the PET film is polyethylene terephthalate, which is prepared by condensation polymerization reaction of terephthalic acid and ethylene glycol, and has the advantages of good surface hardening, strong wear resistance, and the like.

Specifically, please refer to fig. 3, the piston 41 is made of acrylic or foam or PET film with optical properties, and the above materials have general properties, i.e. elasticity, light weight, fast pressure-sensitive fixation, convenient use, flexibility, etc., so that the piston 41 can fill the inside of the groove 40 of the vacuum structure after use, thereby forming a suction force, and tightly attaching the back plate 10 to the reflective film 20.

Optionally, with continued reference to fig. 3, the backlight module 100 is a side-in type backlight module.

It should be noted that the embodiment shown in fig. 3 only schematically shows a relative position diagram of the infrared light emitter 70 on the side of the back plate 10, and does not represent actual dimensions.

Specifically, please continue to refer to fig. 3, backlight unit 100 of the present application is a side-in type backlight unit, that is, the infrared emitter is disposed on the side of backlight unit 100, the infrared signal emitted by the infrared emitter is directly reflected by the finger on glass cover plate 50, the infrared signal reflected by the finger is received by sensor 60 correspondingly disposed through the via hole, side-in type backlight unit 100 can avoid punching on back plate 10, and the infrared emitter is disposed, so as to further avoid unevenness of each film layer of backlight unit 100, and further avoid newton ring phenomenon.

Based on the inventive concept of the foregoing embodiments, fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present application, please refer to fig. 9, which provides a display device including: the backlight module 100 and the display panel 110 provided by the embodiment of the invention are provided. The implementation of the display device can be seen in the above-mentioned embodiment of the backlight module 100, and repeated descriptions are omitted.

The display device according to an embodiment of the present invention may be, but is not limited to, any one of a liquid crystal display panel device, an organic electroluminescence display device, a cathode ray tube display device, a plasma display device, electronic paper, and an electroluminescence display device. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention.

Optionally, fig. 10 is a cross-sectional view of the display device along a-a' shown in fig. 9, please refer to fig. 10, and the present application further provides a display device 200 including a backlight module 100 and a display panel 110.

Please refer to fig. 10, in the present application, a display panel 50 is further disposed in a stacked manner with the backlight module 100, a fingerprint identification area is disposed on a side of the display panel 50 away from the backlight module 100, a sensor 60 is correspondingly disposed right below the fingerprint identification area, an infrared light emitter 70 is disposed on a side of the display panel 50 close to the backlight module 100, the infrared light emitter 70 is disposed on a side of the display module 100, the infrared light emitter 70 is configured to emit an infrared light signal, i.e., infrared fingerprint detection light, and the sensor 60 has a plurality of sensing units and is configured to receive the infrared fingerprint detection light, wherein the sensor 60 and through holes 11 (shown in fig. 3) are disposed in a one-to-one correspondence manner, i.e., the fingerprint detection light reflected by the finger is received by the sensor 60.

Specifically, please refer to fig. 10, the sensor 60 can be disposed below the display screen, so as to meet the requirement of the consumer for the display device in social development, achieve the touch function, and improve the practicability of the display device.

According to the embodiments, the application has the following beneficial effects:

this application provides a backlight unit and display device adopts and sets up the evacuation structure around the through-hole of backplate, and the inside cavity that is of evacuation structure, and is provided with gasket and piston, and the piston is used for discharging the inside air of evacuation structure, makes the evacuation structure be in adsorption state, and thereby when the gasket prevented the evacuation structure be in adsorption state, extrudes the planarization that the dent influences the reflectance coating with the reflectance coating. The introduction of the vacuumizing structure enables the back plate and the reflecting film to be tightly attached together, the smoothness of the reflecting film is guaranteed, when the reflecting film keeps smooth, other film layers in the backlight module can also keep smooth, and further the phenomenon of Newton rings or interference fringes caused by the unevenness of the film layers in the backlight module is avoided.

The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.

Claims

1. A backlight module, comprising:

the backlight module comprises a back plate, a reflecting film and a light guide plate, wherein the reflecting film is positioned between the back plate and the light guide plate along a direction perpendicular to the back plate, and at least one through hole is formed through the back plate along the direction perpendicular to the back plate;

at least one vacuumizing structure is arranged around the through hole along the direction perpendicular to the back plate, and the vacuumizing structure is positioned on one side, far away from the reflecting film, of the back plate;

2. The backlight module according to claim 1,

the back plate further comprises a first area surrounding the through hole, and the vacuum-pumping structure is positioned in the first area;

the vacuum-pumping structure is a groove formed by stamping the back plate.

3. The backlight module according to claim 2,

the height of the groove is 0.3 mm-0.5 mm along the direction vertical to the back plate.

4. The backlight module according to claim 3,

the groove comprises a first opening and a second opening along a direction perpendicular to the back plate, and the distance between the second opening and the reflecting film is larger than that between the first opening and the reflecting film;

an orthographic projection of the first opening in a direction perpendicular to the back plate overlaps with an orthographic projection of the second opening in a direction perpendicular to the back plate.

5. The backlight module according to claim 4,

the first opening and the second opening are circular or rectangular or square or triangular in shape.

6. The backlight module according to claim 5,

and a gasket is arranged on the back plate and surrounds the first opening, and the height of the gasket is 0.05-0.1 mm along the direction perpendicular to the back plate.

7. The backlight module according to claim 6,

the gasket is formed by stamping the back plate;

or the gasket is bonded with the back plate and is made of foam rubber or a PC plate.

8. The backlight module according to claim 7,

in a direction perpendicular to the back plate, the gasket includes a first surface that is in contact with the reflective film, the first surface being a rough surface.

9. The backlight module according to claim 1,

the piston is made of acrylic or foam or PET film with optical characteristics.

10. The backlight module according to claim 1,

the backlight module is a side-in type backlight module.

11. A display device, comprising the backlight module and the display panel of any one of claims 1-10.