CN111801677A

CN111801677A - Backlight module, optical fingerprint system under screen, display module and electronic device

Info

Publication number: CN111801677A
Application number: CN201980004021.1A
Authority: CN
Inventors: 张胜斌
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-01-31
Filing date: 2019-06-10
Publication date: 2020-10-20
Also published as: CN109937378A; WO2020155038A1; CN210155481U; WO2020155512A1

Abstract

The invention provides a backlight module, an optical fingerprint system under a screen, a display module and an electronic device. The backlight module is close to the liquid crystal panel and comprises a light source component and a light guide component which are adjacent; the light guide assembly comprises a first light guide part and a second light guide part; in the vertical direction of the liquid crystal panel, the minimum distance between any position in the second light guide part and the liquid crystal panel is smaller than the minimum distance between any position in the first light guide part and the liquid crystal panel; the first light guide part is provided with a plurality of first light homogenizing structures, the second light guide part is provided with a plurality of second light homogenizing structures, and the first light homogenizing structures and the second light homogenizing structures are used for enabling the brightness of light rays of the light source component to reach the liquid crystal panel through the first light guide part and the second light guide part to be uniform. In the invention, the first light homogenizing structure and the second light homogenizing structure avoid the uneven brightness of the liquid crystal panel caused by the attenuation difference of the light source component passing through the first light guide part and the attenuation difference of the light source component passing through the second light guide part.

Description

Backlight module, optical fingerprint system under screen, display module and electronic device

The present application claims priority of international patent application with the application number PCT/CN2019/074231, entitled "a backlight module, a display module, an optical fingerprint system under screen, and an electronic device", filed in 2019, 1, 31, which is incorporated herein by reference in its entirety.

Technical Field

The invention relates to the technical field of display, in particular to a backlight module, an optical fingerprint system under a screen, a display module and an electronic device.

Background

Liquid Crystal Displays (LCDs) have many advantages such as thin body, power saving, no radiation, etc., and are widely used in electronic products such as televisions, computers, mobile phones, etc. The LCD display is a passive luminous display, its display screen itself can not give out light, but by the backlight unit behind the display screen illumination, its display panel is usually by liquid crystal display panel and backlight unit looks parallel arrangement and hug closely through the black glue and form, wherein, backlight unit includes the light source and the leaded light module group that links to each other with the light source, and the height of light source and leaded light module group is the same, make backlight unit wholly be a high plane, the light of light source launches after leaded light module group's processing, even shine on liquid crystal display panel, thereby make display panel display pattern. With the development of display technology, additional functions such as fingerprint recognition are increasingly widely used in display devices, and display panels having the functions of fingerprint recognition have also been widely studied.

At present, current optics fingerprint display module assembly, as shown in fig. 1, including fingerprint module assembly, liquid crystal display panel and backlight unit, wherein, liquid crystal display panel is located the backlight unit top, and liquid crystal display panel and backlight unit are the plane, because backlight unit can't pierce through light, for satisfying fingerprint module assembly's discernment performance, need set up fingerprint module assembly between liquid crystal display panel's one end and backlight unit's one end, liquid crystal display panel's the other end and backlight unit's the other end pass through the black glue and bond, form LCD optics fingerprint identification display module assembly.

However, in the existing display module, the added functional module can form a gap with a large gap between the liquid crystal panel and the backlight module, and the gap interval formed is not uniform, so that the backlight module and the liquid crystal panel cannot be tightly attached, the display brightness of the display module is not uniform, and the display effect is affected.

Content of application

In order to solve the above technical problems, the present invention provides a backlight module, an optical fingerprint system under a screen, a display module and an electronic device.

In a first aspect, the present invention provides a backlight module, which is adjacent to a liquid crystal panel, and comprises a light source assembly and a light guide assembly which are adjacent to each other; the light guide assembly comprises a first light guide part and a second light guide part;

in the vertical direction of the liquid crystal panel, the minimum distance between any position in the second light guide part and the liquid crystal panel is smaller than the minimum distance between any position in the first light guide part and the liquid crystal panel;

the first light guide part is provided with a plurality of first light-homogenizing structures, the second light guide part is provided with a plurality of second light-homogenizing structures, and the first light-homogenizing structures and the second light-homogenizing structures are used for enabling the brightness of light rays of the light source assembly to reach the liquid crystal panel through the first light guide part and the second light guide part to be uniform.

Optionally, the first light guide part and the second light guide part are integrally formed to form the light guide assembly.

Optionally, the first light guide part and the second light guide part are connected to each other to form the light guide assembly.

Optionally, the light guide assembly further includes a light guide plate connecting portion located between the first light guide portion and the second light guide portion, the light guide plate connecting portion is provided with a plurality of third light-homogenizing structures, and the third light-homogenizing structures are configured to make brightness of light rays of the light source assembly reaching the liquid crystal panel through the light guide plate connecting portion and the first light guide portion and the second light guide portion uniform, respectively.

Optionally, the first light uniformizing structures are non-uniformly distributed in the first light guiding portion.

Optionally, the density or size of the first light uniformizing structure at any position in the first light guide part is positively correlated with the optical path length of the light source assembly reaching the position in the first light guide part, and is positively correlated with the minimum distance from the position in the first light guide part to the liquid crystal panel.

Optionally, the second light uniformizing structures are non-uniformly distributed in the second light guiding portion.

Optionally, the minimum distances from the respective positions in the second light guide portion to the liquid crystal panel are equal, and the density or size of the second light uniformizing structure at any position in the second light guide portion is positively correlated to the optical path length of the light source assembly reaching the position in the second light guide portion.

Optionally, the first light uniformizing structure, the second light uniformizing structure, and the third light uniformizing structure have a light guide particle structure and are respectively disposed in the first light guide part, the second light guide part, and the light guide plate connection part.

Optionally, the first light uniformizing structure, the second light uniformizing structure, and the third light uniformizing structure have protruding light guide structures and are respectively disposed on a surface of the first light guide portion, a surface of the second light guide portion, and a surface of the light guide plate connection portion.

Optionally, the first light uniformizing structure, the second light uniformizing structure, and the third light uniformizing structure have a concave light guiding structure and are respectively disposed on a surface of the first light guiding portion, a surface of the second light guiding portion, and a surface of the light guiding plate connecting portion.

Optionally, the first, second, and third light unifying structures have one of a rectangle, a triangle, a circle, and an ellipse.

In a second aspect, the present invention provides an optical fingerprint system under a screen, which is applied to an electronic device comprising a liquid crystal panel and the backlight module; the liquid crystal panel comprises a display area and a non-display area which are adjacent;

the minimum distance between the backlight module and the non-display area is larger than the minimum distance between the backlight module and the display area;

optical fingerprint system includes the optics fingerprint identification module under the screen, the optics fingerprint identification module set up in backlight unit with between the non-display area.

Optionally, the backlight module comprises a first backlight area, a second backlight area and a third backlight area;

the first backlight area and the non-display area are arranged oppositely, the second backlight area and the third backlight area are arranged oppositely to the display area, the minimum distance between the first backlight area and the non-display area is larger than the minimum distance between the third backlight area and the display area, and the second backlight area is connected with the first backlight area and the third backlight area.

Optionally, the light guide assembly is bent at the second backlight area toward a side away from the liquid crystal panel, the first light guide portion is located in the second backlight area, and the second light guide portion is located in the third backlight area.

Optionally, the light source assembly is located on a side of the first light guide portion away from the second light guide portion, or on a side of the light guide assembly away from the liquid crystal panel.

Optionally, the backlight module further comprises a reflective film, a diffusion sheet, a lower prism film, an upper prism film, and an iron frame;

the iron frame accommodates the light source assembly, the light guide assembly, the reflective film, the diffusion sheet, the lower prism film, and the upper prism film;

the reflection film is arranged on one side, far away from the liquid crystal panel, of the light guide assembly, and the diffusion sheet, the lower prism film and the upper prism film are sequentially arranged on one side, close to the liquid crystal panel, of the light guide assembly.

Optionally, the reflective film, the diffusion sheet, the lower prism film, and the upper prism film are bent toward a side away from the liquid crystal panel at the second backlight area.

Optionally, when the light of the light source assembly is reflected by the surface of the liquid crystal panel away from the backlight module, the light reaches the optical fingerprint identification module.

In a third aspect, the present invention provides a display module, which includes a backlight module and a liquid crystal panel that are adjacent to each other, where the backlight module includes a light source assembly and a light guide assembly that are adjacent to each other;

the light guide assembly comprises a first light guide part and a second light guide part;

In a fourth aspect, the present invention provides an electronic device comprising the off-screen optical fingerprint system.

In the invention, the backlight module is close to the liquid crystal panel, the backlight module comprises a light source component and a light guide component which are adjacent, and the light guide component comprises a first light guide part and a second light guide part; the light of the light source component can firstly enter the first light guide part from one side of the light guide component and then reach the second light guide part; or, the light of the light source assembly may enter the first light guide portion and the second light guide portion from a side of the light guide assembly away from the liquid crystal panel; one part of light of the light source component reaches the liquid crystal panel through the first light guide part, and the other part of light reaches the liquid crystal panel through the first light guide part and the second light guide part; or, a part of light of the light source assembly reaches the liquid crystal panel through the first light guide part, and the other part of light reaches the liquid crystal panel through the second light guide part. The minimum distance between any position in the second light guide part and the liquid crystal panel is smaller than the minimum distance between any position in the first light guide part and the liquid crystal panel; the light path of the light source component reaching the liquid crystal panel through the first light guide part is different from the light path of the light source component reaching the liquid crystal panel through the second light guide part, and the attenuation of the light source component reaching the liquid crystal panel through the first light guide part is different from the attenuation of the light source component reaching the liquid crystal panel through the second light guide part. The first light guide part is provided with a plurality of first light homogenizing structures, the first light homogenizing structures adjust the brightness of the light source assembly reaching the liquid crystal panel through the first light guide part, the second light guide part is provided with a plurality of second light homogenizing structures, the second light homogenizing structures adjust the brightness of the light source assembly reaching the liquid crystal panel through the second light guide part, and further the brightness of the light source assembly reaching the liquid crystal panel through the first light guide part and the second light guide part is uniform, so that the light of the light source assembly is prevented from being uneven in emergent brightness due to the fact that the attenuation of the light source assembly passing through the first light guide part and the attenuation of the light source assembly passing through.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a conventional optical fingerprint display module;

FIG. 2 is a schematic structural diagram of a conventional display module;

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

fig. 4 is a schematic structural diagram of a backlight module according to a third embodiment of the present invention;

fig. 5 is a schematic structural diagram of a display module according to a fourth embodiment of the present invention;

fig. 6 is a schematic structural diagram of another display module according to a fourth embodiment of the present invention;

fig. 7 is a schematic structural diagram of a display module according to a sixth embodiment of the present invention;

fig. 8 is a schematic structural diagram of another display module according to a sixth embodiment of the present invention;

fig. 9A is a schematic structural diagram of a backlight module according to another embodiment of the invention;

fig. 9B is a schematic structural diagram of a backlight module according to another embodiment of the invention;

FIG. 10 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;

fig. 12 is a schematic structural diagram of a backlight module according to another embodiment of the invention;

fig. 13 is a schematic structural diagram of a backlight module according to another embodiment of the invention;

FIG. 14 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;

FIG. 16 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;

fig. 17 is a schematic structural diagram of a backlight module according to another embodiment of the invention;

FIG. 18 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;

FIG. 19 is a schematic view of a backlight module according to another embodiment of the present invention;

FIG. 20 is a schematic diagram of an optical fingerprint system according to another embodiment of the present invention;

fig. 21 is a schematic structural diagram of a display module according to another embodiment of the invention.

Detailed Description

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Example one

Fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the invention.

The first aspect of the present invention provides a backlight module 10 for forming a display module by bonding with a liquid crystal panel 20, wherein the backlight module 10 is located at the back of the display module and can provide a light source, which is capable of providing sufficient brightness and uniformly distributed light source, so that the display module can normally display images.

As shown in fig. 2, the backlight module 10 includes a light source assembly 13 and a light guide module 14, the liquid crystal panel 20 can be divided into a display area 22 and a non-display area 21, wherein the display area 22 is used for displaying a pattern, and the liquid crystal panel 20 is further covered with a glass cover plate 50. Backlight unit 10 and liquid crystal display panel 20 are the horizontally plane, and backlight unit 10 and liquid crystal display panel 20 parallel arrangement to hug closely through the black glue 40 at both ends and form display module, equidistant setting between backlight unit 10 and the liquid crystal display panel 20, the light that comes out from backlight unit 10 like this can be even shine on liquid crystal display panel 20, has guaranteed the homogeneity of liquid crystal display panel display area 22 luminance, has improved the effect of showing. When some functional modules are added in the display module, the added functional module 30 is located between one end of the liquid crystal panel 20 and one end of the backlight module 10, and the other end of the liquid crystal panel 20 is bonded with the other end of the backlight module 10 through the black glue 40, so that a larger gap is formed between the liquid crystal panel 20 and the backlight module 10, and the gap distance formed between the liquid crystal panel 20 and the backlight module 10 is inconsistent, so that the display brightness of the display module is uneven, and the display effect is reduced.

For the above reasons, the backlight module 10 according to the present invention is used for forming a display module by being attached to a liquid crystal panel, as shown in fig. 3, the backlight module 10 includes a first plane 11 opposite to a non-display area of the liquid crystal panel and a second plane 12 opposite to a display area of the liquid crystal panel, where the planes are parallel to a horizontal direction, that is, the first plane 11 and the second plane 12 are two horizontal planes parallel to each other. The backlight module 10 includes a first plane 11 and a second plane 12, and it should be noted that one end of the first plane 11 is connected to one end of the second plane 12 to ensure the performance of the backlight module 10, wherein when the backlight module 10 is attached to a liquid crystal panel to form a display module, the first plane 11 of the backlight module 10 is disposed opposite to a non-display area of the liquid crystal panel, and the second plane 12 of the backlight module 10 is disposed opposite to a display area of the liquid crystal panel.

In order to ensure the uniformity of the display brightness after the functional module is disposed, in this embodiment, as shown in fig. 3, the first plane 11 is lower than the second plane 12 in the vertical direction, so that the backlight module 10 forms a receiving space 16 for receiving the functional module at the first plane 11, wherein the vertical direction is perpendicular to the horizontal direction, that is, the first plane 11 and the second plane 12 of the backlight module 10 are two planes with different heights in the vertical direction, and the vertical height of the first plane 11 is lower, so that the receiving space 16 is left at the first plane 11 of the backlight module 10, the functional module can be disposed in the receiving space 16, when the liquid crystal panel is attached, the first plane 11 is opposite to the non-display area, the second plane 12 is opposite to the display area, the functional module can be disposed in the receiving space 16 at the first plane 11 of the backlight module 10, the first plane 11 and the second plane 12 are two planes with different heights, so that the second plane 12 and one surface of the liquid crystal panel display area facing the second plane 12 can be arranged at equal intervals, light of the backlight module 10 can be uniformly irradiated on the display area of the liquid crystal panel, uniformity of display brightness is guaranteed, and display effect is improved.

In this embodiment, the specific value of the first plane 11 lower than the second plane 12 in the vertical direction can be selected and set according to the thickness of the functional module set in actual requirements, and it should be noted that, since one end of the second plane 12 is bonded to one end of the display area of the liquid crystal panel by black glue when the liquid crystal panel is attached, so that the side of the display area facing the second plane 12 has an equidistant distance from the second plane 12, the specific value of the first plane 11 lower than the second plane 12 in the vertical direction can be obtained by subtracting the value of the distance between the side of the display area facing the second plane 12 and the second plane 12 from the thickness of the functional module. Specifically, if the thickness of the functional module 30 is 1mm, and after the backlight module 10 is attached to the liquid crystal panel, a distance between one surface of the display area facing the second plane 12 and the second plane 12 is 0.5mm, the height of the first plane 11 in the vertical direction, which is lower than the second plane 12, is 0.5 mm.

Further, in this embodiment, the backlight module 10 includes a light guide module 14 and a light source assembly 13, the light guide module 14 is located in the region corresponding to the second plane 12, the light source assembly 13 is located in the region corresponding to the first plane 11, as shown in fig. 3, one end of the light guide module 14 is connected to one end of the light source assembly 13, the light source assembly 13 provides a light source for the backlight module 10, and light emitted by the light source assembly 13 is emitted after being processed by the light guide module 14. The light guide module 14 is located in the region corresponding to the second plane 12, the light source assembly 13 is located in the region corresponding to the first plane 11, the vertical height of the light source assembly 13 can be smaller than that of the light guide module 14, that is, the light source assembly 13 is located at a position where the light source assembly 13 is located, and the first plane 11 can be lower than the second plane 12 in the vertical direction, so that the backlight module 10 is provided with the accommodating space 16 at the position where the light source assembly 13 corresponds to set the functional module.

In this embodiment, the light guide module 14 of the backlight module 10 may include a reinforcing steel plate, a reflective film, a light guide plate, a light homogenizing film, and a brightness enhancement film, and the film layer constituting the light guide module 14 may be a film layer constituting in the prior art, and may include other film layers besides the above film layers, and the specific film layers and the setting mode between the film layers may refer to the prior art and are not repeated in this embodiment.

Further, in this embodiment, the backlight module 10 further includes a functional module, and the functional module is disposed in the accommodating space 16, wherein the functional module may be a fingerprint module, and the functional module may also be a module for improving the performance of the backlight module 10 or enabling the backlight module 10 itself to have other functions.

The present embodiment provides a backlight module 10, the backlight module 10 includes a first plane 11 opposite to the liquid crystal panel display area and a second plane 12 opposite to the liquid crystal panel display area, and the first plane 11 is lower than the second plane 12 in the vertical direction, so that the backlight module 10 forms an accommodating space 16 for accommodating the functional module at the first plane 11, that is, the first plane 11 and the second plane 12 of the backlight module 10 are two planes with different heights in the vertical direction, and the vertical height of the first plane 11 is lower, so that the accommodating space 16 is left at the first plane 11 of the backlight module 10, and the functional module can be disposed in the accommodating space 16. When the backlight module is attached to the liquid crystal panel, the functional module is disposed in the accommodating space 16 of the first plane 11 of the backlight module 10, so that the second plane 12 and the display area of the liquid crystal panel facing the second plane 12 can be disposed at equal intervals, thereby enabling the light of the backlight module 10 to be uniformly irradiated onto the display area of the liquid crystal panel, ensuring the uniformity of the display brightness, and improving the display effect. The problem of current display module assembly, the function module of addding can make to form the inconsistent clearance of interval between liquid crystal display panel and the backlight unit, make display brightness inhomogeneous, influence display effect is solved.

Example two

Further, on the basis of the first embodiment, in the present embodiment, one end of the second plane 12 close to the first plane 11 extends toward the first plane 11 and is connected to the first plane 11, as shown in fig. 3, one end of the second plane 12 close to the first plane 11 extends toward the first plane 11 and is connected to the first plane 11, that is, one end of the second plane 12 connected to the first plane 11 forms a special-shaped structure, so that the first plane 11 is lower than the second plane 12, and the first plane 11 is connected to the second plane 12, and further an accommodating space 16 is left on the backlight module 10 at the first plane 11 for disposing a functional module, and meanwhile, a portion extending from the second plane 12 is made of a material with a light guiding performance, which does not affect the performance of the backlight module 10.

In this embodiment, specifically, the backlight module 10 includes the light guide module 14 and the light source assembly 13, the light guide module 14 is located in the region corresponding to the second plane 12, the light source assembly 13 is located in the region corresponding to the first plane 11, one end of the light guide module 14 close to the light source assembly 13 extends toward the light source assembly 13 and is connected to the light source assembly 13, namely, the end of the light guide module 14 connected to the light source assembly 13 forms a special-shaped structure to be connected to the light source assembly 13, and the performance of the backlight module 10 is ensured while the accommodation space 16 is formed at the position of the backlight module 10 corresponding to the light source assembly 13.

It should be noted that, in the present embodiment, the irregular shape refers to a shape different from the first plane 11 and the second plane 12, that is, the connection structure is a plane that is not horizontal, specifically, an inclined plane inclined toward the first plane, an arc surface, and the like.

In the backlight module 10 provided by this embodiment, an end of the second plane 12 close to the first plane 11 extends toward the first plane 11 and is connected to the first plane 11, that is, an end of the second plane 12 connected to the first plane 11 forms a special-shaped structure to connect to the first plane 11, so that an accommodating space 16 for accommodating the functional module is formed at the first plane 11 of the backlight module 10, and the performance of the backlight module 10 is ensured.

EXAMPLE III

Fig. 4 is a schematic structural diagram of a backlight module according to a third embodiment of the present invention.

Further, on the basis of the third embodiment, in this embodiment, the backlight module 10 further includes: as shown in fig. 4, a first end of the light guide connection portion 15 is connected to the first plane 11, a second end of the light guide connection portion 15 is connected to the second plane 12, and the first end is lower than the second end in the vertical direction, that is, the first plane 11 and the second plane 12 are connected through the light guide connection portion 15, and the first end of the light guide connection portion 15 connected to the first plane 11 is lower than the second end of the light guide connection portion 15 connected to the second plane 12, so that the first plane 11 is lower than the second plane 12 in the vertical direction through the light guide connection portion 15 having the special-shaped structure, so that the backlight module 10 forms an accommodation space 16 at the first plane 11, and the performance of the backlight module 10 is ensured.

It should be noted that, in the present embodiment, the light guiding connection portion 15 has a light guiding performance to meet the functional requirements of the backlight module 10, the shape of the light guiding connection portion 15 can be selected according to the actual requirements, specifically, can be selected according to the height difference between the first plane 11 and the second plane 12 in the vertical direction and the brightness performance requirements of the backlight module, and the like, wherein, in the present embodiment, the light guiding connection portion 15 is an arc-shaped structure. The light guide connecting portion 15 may be formed by laminating a plurality of light film layers, and the light guide connecting portion 15 may include a reinforcing steel plate, a reflective film, a light guide plate, a light homogenizing film, a brightness enhancement film, etc. which are sequentially disposed.

In this embodiment, specifically, as shown in fig. 4, the backlight module 10 further includes a light guide module 14 and a light source assembly 13, the light guide module 14 is located in a region corresponding to the second plane 12, the light source assembly 13 is located in a region corresponding to the first plane 11, the light source assembly 13 is connected to the first end of the light guide connection portion 15, the second end of the light guide connection portion 15 is connected to the light guide module 14, so that the light source assembly 13 is connected to the light guide module 14 through the light guide connection portion 15, and the performance of the backlight module 10 is ensured while the accommodation space 16 is formed at a position of the backlight module 10 corresponding to the light source assembly 13.

The backlight module 10 provided by the embodiment includes the light guide connecting portion 15, the first end of the light guide connecting portion 15 is connected to the first plane 11, the second end of the light guide connecting portion 15 is connected to the second plane 12, and the first end is lower than the second end in the vertical direction, that is, the first plane 11 and the second plane 12 are connected through the light guide connecting portion 15, and the first plane 11 is lower than the second plane 12 in the vertical direction through the light guide connecting portion 15 with the special-shaped structure, so that the backlight module 10 forms the accommodating space 16 at the first plane 11, and the performance of the backlight module 10 is ensured.

Example four

Fig. 5 is a schematic structural diagram of a display module according to a fourth embodiment of the present invention, and fig. 6 is a schematic structural diagram of another display module according to a fourth embodiment of the present invention.

A second aspect of the present invention provides a display module, as shown in fig. 5 and fig. 6, in this embodiment, the display module includes a liquid crystal panel 20 and a backlight module 10, wherein the liquid crystal panel 20 includes a non-display area 21 and a display area 22, the backlight module 10 includes a first plane 11 and a second plane 12, the first plane 11 is disposed opposite to the non-display area 21, and the second plane 12 is disposed opposite to the display area 22, it should be noted that in this embodiment, a plane refers to a plane parallel to a horizontal direction, that is, the first plane 11 and the second plane 12 are two horizontal planes parallel to each other.

In order to improve the uniformity of the display brightness of the display module with the functional module, in the present embodiment, as shown in fig. 5, the first plane 11 of the backlight module 10 is lower than the second plane 12 in the vertical direction, and an accommodating space 16 for accommodating the functional module 30 is provided between the first plane 11 and the non-display area 21, wherein the vertical direction is perpendicular to the horizontal direction, that is, the first plane 11 and the second plane 12 of the backlight module 10 are different in height in the vertical direction, and the first plane 11 is lower than the second plane 12, so that the accommodating space 16 is left between the first plane 11 and the non-display area 21 of the backlight module 10, the additional functional module 30 can be disposed in the accommodating space 16, and the second plane 12 and the first plane 11 are two planes with different heights, so that the second plane 12 can be disposed at the same interval as the side of the display area 22 facing the second plane 12, therefore, the light of the backlight module 10 can be uniformly irradiated on the display area 22 of the liquid crystal panel 20, the uniformity of the display brightness of the display area 22 is ensured, and the display effect is improved.

In this embodiment, the specific value of the first plane 11 that is lower than the second plane 12 in the vertical direction may be selected and set according to the thickness of the function module 30 that is added in the actual requirement, the specific value of the first plane 11 that is lower than the second plane 12 in the vertical direction may be obtained by subtracting the value of the distance between the second plane 12 and the surface of the display area 22 facing the second plane 12 from the thickness of the function module 30, and the specific calculation method may refer to embodiment one, and is not described in detail in this embodiment.

Further, in this embodiment, the backlight module 10 includes a light guide module 14 and a light source module 13, the light guide module 14 is located in the region corresponding to the second plane 12, and the light source module 13 is located in the region corresponding to the first plane 11, as shown in fig. 5, one end of the light guide module 14 is connected to one end of the light source module 13, the light source module 13 provides a light source for the backlight module 10, and light emitted from the light source module 13 is emitted after being processed by the light guide module 14. Light guide module 14 is located the region that second plane 12 corresponds, and light source subassembly 13 is located the region that first plane 11 corresponds, can be less than the vertical height that light guide module 14 set up through the vertical height that makes light source subassembly 13 set up, be about to sink the set up position of light source subassembly 13, just also can make first plane 11 be less than second plane 12 in vertical direction to make and form between light source subassembly 13 and the non-display area 21 and be used for holding the accommodation space 16 of function module.

In this embodiment, the film layer of the light guide module 14 can refer to the first embodiment, and is not described in detail in this embodiment. The liquid crystal panel may include a lower polarizer, an array substrate, a liquid crystal, a color filter, an upper polarizer, and the like, and the liquid crystal panel may be an existing liquid crystal panel, and may also include some other structures, and specific structures and arrangement methods may be referred to in the liquid crystal panel in the prior art.

Further, in the present embodiment, as shown in fig. 6, the display module further includes a functional module 30, and the functional module 30 is disposed in the accommodating space 16, wherein the functional module 30 may be a fingerprint module or a module capable of implementing other functions.

In this embodiment, the display module may be a component for displaying in products such as electronic paper, a tablet computer, a liquid crystal display, a liquid crystal television, a digital photo frame, and a mobile phone.

The embodiment provides a display module, through the backlight module 10 comprising a first plane 11 opposite to the non-display area 21 of the liquid crystal panel 20 and a second plane 12 opposite to the display area 22 of the liquid crystal panel, and making the first plane 11 lower than the second plane 12 in the vertical direction, and having an accommodating space 16 for accommodating the functional module 30 between the first plane 11 and the non-display area 21, that is, making the first plane 11 and the second plane 12 of the backlight module 10 have different heights in the vertical direction, and the first plane 11 is lower than the second plane 12, so as to leave the accommodating space 16 between the first plane 11 and the non-display area 21 of the backlight module 10, the additional functional module 30 can be disposed in the accommodating space 16, making the second plane 12 and the side of the display area 22 facing the second plane 12 capable of being disposed at equal intervals, so that the light of the backlight module 10 can be uniformly irradiated onto the display area 22 of the liquid crystal panel 20, the uniformity of the display brightness of the display area 22 is ensured, and the display effect is improved.

EXAMPLE five

Further, on the basis of the fourth embodiment, as shown in fig. 5 and fig. 6, in the present embodiment, a surface of the non-display area 21 facing the first plane 11 is flush with a surface of the display area 22 facing the second plane 12, and the backlight module 10 forms the accommodating space 16 at the first plane 11, that is, a surface of the non-display area 21 and a surface of the display area 22 facing the backlight module 10 of the liquid crystal panel 20 are flush with each other and have the same height plane, and the first plane 11 of the backlight module 10 is lower than the second plane 12 in the vertical direction, so that the backlight module 10 forms the accommodating space 16 at the first plane 11 for accommodating the functional module 30, thereby achieving that after the functional module 30 is disposed, the uniform distance between the surface of the display area 22 facing the second plane 12 and the second plane 12 can be ensured, and the uniformity of the display brightness of the display area 22 can be ensured.

In this embodiment, the specific value of the first plane 11 lower than the second plane 12 in the vertical direction may be selected and set according to the thickness of the function module 30 set in the actual requirement, the specific value of the first plane 11 lower than the second plane 12 in the vertical direction may be obtained by subtracting the value of the distance between the second plane 12 and the surface of the display area 22 facing the second plane 12 from the thickness of the function module 30, and the specific calculation method may refer to embodiment one, and is not described in detail in this embodiment.

Further, in the present embodiment, the first plane 11 and the second plane 12 of the backlight module 10 are connected, and the first plane 11 is lower than the second plane 12 in the vertical direction, and a specific arrangement manner may be that one end of the second plane 12 close to the first plane 11 extends toward the first plane 11 and is connected with the first plane 11, so that one end connected with the first plane 11 through the second plane 12 forms a special-shaped structure to be connected with the first plane 11, and a specific arrangement manner may be referred to in embodiment two; the first plane 11 and the second plane 12 may also be connected by a special-shaped light guide connection portion 15, and the first plane 11 is lower than the second plane 12 in the vertical direction.

In this embodiment, the backlight module 10 includes a light guide module 14 and a light source assembly 13, the light guide module 14 is located in an area corresponding to the second plane 12, and the light source assembly 13 is located in an area corresponding to the first plane 11. The light guide module 14 and the light source assembly 13 may extend toward the light source assembly 13 and be connected to the light source assembly 13 by using one end of the light guide module 14, and the light guide module 14 may also be connected to the light source assembly 13 by using the light guide connection portion 15.

Further, in the present embodiment, as shown in fig. 6, the display module further includes a function module 30, the function module 30 is disposed in the accommodating space 16, and the function module 30 may be a fingerprint identification module or a module with other functions.

In the display module provided by this embodiment, the surface of the non-display area 21 facing the first plane 11 is flush with the surface of the display area 22 facing the second plane 12, so that the backlight module 10 forms the accommodating space 16 at the first plane 11, that is, the surfaces of the non-display area 21 and the display area 22 of the liquid crystal panel 20 facing the backlight module 10 are flush with each other and are at the same height, and the first plane 11 of the backlight module 10 is lower than the second plane 12 in the vertical direction, so that the backlight module 10 forms the accommodating space 16 at the first plane 11 for accommodating the functional module 30, and after the functional module 30 is disposed, the equidistant arrangement between the surface of the display area 22 facing the second plane 12 and the second plane 12 can be still ensured, and the uniformity of the display brightness of the display area 22 is ensured.

EXAMPLE six

Fig. 7 is a schematic structural diagram of a display module according to a sixth embodiment of the present invention, and fig. 8 is a schematic structural diagram of another display module according to a sixth embodiment of the present invention.

Further, on the basis of the fourth embodiment, as shown in fig. 7 and 8, in the present embodiment, the side of the non-display area 21 facing the first plane 11 is higher than the side of the display area 22 facing the second plane 12 in the vertical direction, and the side of the non-display area 21 facing the first plane 11 and the first plane 11 together form the accommodating space 16, that is, the side of the non-display area 21 facing the first plane 11 and the side of the display area 22 facing the second plane 12 are two planes with different heights in the vertical direction, and the side of the non-display area 21 facing the first plane 11 is higher than the side of the display area 22 facing the second plane 12, and the first plane 11 of the backlight module 10 is lower than the second plane 12, so that the side of the non-display area 21 facing the first plane 11 and the first plane 11 together form the accommodating space 16, thereby realizing that after the functional module 30 is disposed, the equal spacing between the side of the display area 22 facing the second plane 12 and the second plane 12 can be ensured, and the uniformity of the display brightness of the display area 22 can be ensured.

In this embodiment, as shown in fig. 7, an end of the non-display area 21 close to the display area 22 may extend toward the display area 22 to connect with the display area 22, so that a surface of the non-display area 21 facing the first plane 11 is higher than an end of the display area 22 facing the second plane 12, and the display area 22 and the second plane 12 are disposed at equal intervals. The display area 22 and the non-display area 21 can be connected by a connecting part with a special-shaped structure.

It should be noted that, in the present embodiment, the height of the non-display area 21 facing the first plane 11 is higher than the height of the display area 22 facing the second plane 12, the height of the first plane 11 is lower than the second plane 12, and the distance between the display area 22 facing the second plane 12 and the second plane 12 jointly form the height value of the accommodating space 16, that is, the thickness value of the functional module 30, and the liquid crystal panel 20 is further provided with the glass cover 50, and the liquid crystal panel 20 has more film layers and wires, therefore, in the present embodiment, when the heights of the non-display area 21, the display area 22, the first plane 11 and the second plane 12 are set according to the thickness of the functional module 30, the height value of the non-display area 21 facing the first plane 11 higher than the height value of the display area 22 facing the second plane 12 should occupy a smaller proportion of the thickness to ensure the performance of the liquid crystal panel 20, specifically, if the thickness of the functional module 30 is 1mm, and the distance between the surface of the display area 22 facing the second plane 12 and the second plane 12 is 0.4mm, in this case, the height of the surface of the non-display area 21 facing the first plane 11 higher than the surface of the display area 22 facing the second plane 12 is 0.2mm, and the height of the first plane 11 lower than the second plane 12 is 0.4 mm.

Further, in the present embodiment, the first plane 11 and the second plane 12 of the backlight module 10 are connected, and the first plane 11 is lower than the second plane 12 in the vertical direction, specifically, an end of the second plane 12 close to the first plane 11 extends toward the first plane 11 and is connected to the first plane 11, that is, an end of the second plane 12 connected to the first plane 11 forms a special-shaped structure to connect to the first plane 11, and the specific arrangement mode can be referred to in embodiment two; the first plane 11 and the second plane 12 may also be connected by a special-shaped light guide connection portion 15, and the first plane 11 is lower than the second plane 12 in the vertical direction.

Further, in this embodiment, as shown in fig. 8, the display module further includes a function module 30, the function module 30 is disposed in the accommodating space 16, and the function module 30 may be a fingerprint identification module or a module with other functions.

The present embodiment provides a display module, wherein the side of the non-display area 21 facing the first plane 11 is higher than the side of the display area 22 facing the second plane 12 in the vertical direction, and the side of the non-display area 21 facing the first plane 11 and the first plane 11 together form the receiving space 16, that is, the side of the non-display area 21 facing the first plane 11 and the side of the display area 22 facing the second plane 12 are two planes with different heights in the vertical direction, and the side of the non-display area 21 facing the first plane 11 is higher than the side of the display area 22 facing the second plane 12, and the first plane 11 of the backlight module 10 is lower than the second plane 12, so that the side of the non-display area 21 facing the first plane 11 and the first plane 11 together form the receiving space 16, thereby realizing that after the functional module 30 is disposed, the equal spacing between the side of the display area 22 facing the second plane 12 and the second plane 12 can be ensured, the uniformity of the display luminance of the display area 22 is ensured.

EXAMPLE seven

In a third aspect of the present invention, there is provided an optical fingerprint system under a screen, applied to an electronic device having a liquid crystal panel and a backlight module, the optical fingerprint system under a screen includes a fingerprint detection light source and an optical fingerprint identification module, in this embodiment, referring to fig. 6, a liquid crystal panel 20 includes a non-display area 21 and a display area 22, the optical fingerprint identification module is configured to be disposed under the non-display area 21 of the liquid crystal panel 20 and located in an accommodating space 16 formed by a sinking design of the backlight module 10 in the non-display area 21, specifically, as shown in fig. 6, the backlight module 10 forms the accommodating space 16 by the sinking design at a position corresponding to the non-display area 21, and the optical fingerprint module is disposed in the accommodating space 16, so that the display area 22 of the liquid crystal panel 20 facing a side of the backlight module 10 and a side of the backlight module 10 facing the liquid crystal panel 20 in the display area 22 can be disposed at equal intervals, therefore, the light of the backlight module 10 can be uniformly irradiated on the display area 22 of the liquid crystal panel 20, the uniformity of the display brightness of the display area 22 is ensured, and the display effect is improved.

In this embodiment, the optical fingerprint identification module is configured to be disposed below the non-display area 21 of the liquid crystal panel 20, the fingerprint detection area of the optical fingerprint identification module is at least partially located in the display area 22 of the liquid crystal panel 20, the fingerprint detection light source is configured to emit probe light to the fingerprint detection area located in the display area 22, the probe light forms return light when irradiating a finger in the fingerprint detection area, and is transmitted to the optical fingerprint identification module located in the non-display area 21 through the optical path guiding structure, where the optical path guiding structure is a light guiding structure formed by a light guiding film layer material or other optical layers (such as a reflector or an air gap) on the backlight module 10 side, when performing fingerprint detection identification, the finger is placed in the fingerprint detection area of the liquid crystal panel display area 22, and the fingerprint detection light source emits the probe light to the fingerprint detection area, the light emitted from the light source passes through the liquid crystal panel 22 and is guided by the light path guide structure to the optical fingerprint recognition module at the non-display area 21, and the optical fingerprint recognition module can further detect the fingerprint information by detecting the light and performing photoelectric conversion and other signal processing to perform comparison recognition according to the fingerprint information.

Further, in this embodiment, as shown in fig. 6, the liquid crystal panel 20 includes a non-display area 21 and a display area 22, the backlight module 10 includes a first plane 11 and a second plane 12, the first plane 11 is disposed opposite to the non-display area 21, and the second plane 12 is disposed opposite to the display area 22, it should be noted that in this embodiment, the planes refer to planes parallel to a horizontal direction, that is, the first plane 11 and the second plane 12 are two horizontal planes parallel to each other. Wherein, the first plane 11 of the backlight module 10 is lower than the second plane 12 in the vertical direction, and an accommodating space 1616 for accommodating the functional module 30 is provided between the first plane 11 and the non-display area 21, wherein the vertical direction is a direction perpendicular to the horizontal direction, i.e. the first plane 11 and the second plane 12 of the backlight module 10 have different heights in the vertical direction, and the first plane 11 is lower than the second plane 12, so as to leave a receiving space 16 between the first plane 11 and the non-display area 21 of the backlight module 10, the optical fingerprint recognition module can be disposed in the receiving space 16, since the second plane 12 and the first plane 11 are two planes with different heights, the second plane 12 can be arranged at equal intervals with the side of the display area 22 facing the second plane 12, so that the light of the backlight module 10 can be uniformly irradiated onto the display area 22 of the liquid crystal panel 20.

In this embodiment, the specific value of the first plane 11 that is lower than the second plane 12 in the vertical direction may be selected and set according to the thickness of the additional functional module 30 in the actual requirement, and the specific calculation manner may refer to the first embodiment, which is not described in this embodiment again.

In this embodiment, the backlight module 10 includes a light guide module 14 and a light source assembly 13, the light guide module 14 is located in the region corresponding to the second plane 12, the light source assembly 13 is located in the region corresponding to the first plane 11, as shown in fig. 6, one end of the light guide module 14 is connected to one end of the light source assembly 13, the light source assembly 13 provides a light source for the backlight module 10, and light emitted from the light source assembly 13 is emitted after being processed by the light guide module 14. Light guide module 14 is located the region that second plane 12 corresponds, and light source subassembly 13 is located the region that first plane 11 corresponds, can be less than the vertical height that light guide module 14 set up through the vertical height that makes light source subassembly 13 set up, be about to sink the set up position of light source subassembly 13, just also can make first plane 11 be less than second plane 12 in vertical direction to make and form between light source subassembly 13 and the non-display area 21 and be used for holding the accommodation space 16 of function module.

In this embodiment, the fingerprint detection light source is a non-visible light source independent of the liquid crystal panel and the backlight module, that is, the fingerprint detection light source is an independently arranged detection light source for emitting the detection light to the fingerprint detection area located at the corresponding position of the display area.

The optical fingerprint system under screen provided by this embodiment, through including fingerprint detection light source and optical fingerprint identification module, and this optical fingerprint identification module is used for setting up in the below of the non-display area 21 of liquid crystal display panel 20, and be located backlight unit 10 and through the accommodation space 16 that sinks the design and form in non-display area 21, and the fingerprint detection area of optical fingerprint identification module is located the display area 22 of liquid crystal display panel 20 at least partially, make this fingerprint detection light source be used for to being located the fingerprint detection area transmission probing light of display area 22, probing light forms the return light when shining the finger in fingerprint detection area, and transmit to the optical fingerprint identification module that is located non-display area 21 through the light path guide structure, thereby realize the discernment to the fingerprint, namely through setting up optical fingerprint module in backlight unit 10 in the accommodation space 16 that non-display area 21 department formed through sinking, therefore, the one surface of the display area 22 of the liquid crystal panel 20 facing the backlight module 10 and the one surface of the backlight module 10 facing the liquid crystal panel 20 in the display area 22 can be arranged at equal intervals, so that the light of the backlight module 10 can be uniformly irradiated on the display area 11 of the liquid crystal panel 20, the uniformity of the display brightness of the display area 22 is ensured, and the display effect is improved.

Example eight

Further, on the basis of the seventh embodiment, as shown in fig. 6, in the present embodiment, a surface of the non-display area 21 facing the first plane 11 is flush with a surface of the display area 22 facing the second plane 12, and the backlight module 10 forms the accommodating space 16 at the first plane 11, that is, the non-display area 21 and the surface of the display area 22 facing the backlight module 10 of the liquid crystal panel 20 are flush with each other at the same height plane, and the first plane 11 of the backlight module 10 is lower than the second plane 12 in the vertical direction, so that the backlight module 10 forms the accommodating space 16 at the first plane 11 for accommodating the optical fingerprint identification module, thereby ensuring the equal distance arrangement between the surface of the display area 22 facing the second plane 12 and the second plane 12, and improving the uniformity of the display brightness of the display area 22.

In this embodiment, the specific value of the first plane 11 that is lower than the second plane 12 in the vertical direction may be selectively set according to the thickness of the optical fingerprint identification module set in the actual requirement, and the specific calculation manner may refer to embodiment one, which is not described in detail in this embodiment.

In this embodiment, the backlight module 10 includes a light guide module 14 and a light source module 13, the light guide module 14 is located in a region corresponding to the second plane 12, and the light source module 13 is located in a region corresponding to the first plane 11. The light guide module 14 and the light source assembly 13 may extend toward the light source assembly 13 and be connected to the light source assembly 13 by using one end of the light guide module 14, and the light guide module 14 may also be connected to the light source assembly 13 by using the light guide connection portion 15.

In the optical fingerprint system under the screen provided by this embodiment, the optical fingerprint system is disposed below the non-display area 21 of the liquid crystal panel 20 and located in the receiving space 16 formed by the backlight module 10 in the non-display area 21 through a sinking design, specifically, one surface of the non-display area 21 facing the first plane 11 of the backlight module 10 is flush with one surface of the display area 22 facing the second plane 12 of the backlight module 10, so that the receiving space 16 is formed at the first plane 11 of the backlight module 10, and the optical fingerprint identification module is disposed in the receiving space 16, thereby ensuring that the surface of the display area 22 facing the second plane 12 and the second plane 12 are disposed at equal intervals, and improving the uniformity of the display brightness of the display area 22.

Example nine

Further, on the basis of the seventh embodiment, as shown in fig. 8, in this embodiment, the side of the non-display area 21 facing the first plane 11 is higher than the side of the display area 22 facing the second plane 12 in the vertical direction, and the side of the non-display area 21 facing the first plane 11 and the first plane 11 together form the accommodating space 16, that is, the side of the non-display area 21 facing the first plane 11 and the side of the display area 22 facing the second plane 12 are two planes with different heights in the vertical direction, and the side of the non-display area 21 facing the first plane 11 is higher than the side of the display area 22 facing the second plane 12, and the first plane 11 of the backlight module 10 is lower than the second plane 12, so that the side of the non-display area 21 facing the first plane 11 and the first plane 11 together form the accommodating space 16, and the optical fingerprint identification module is disposed in the accommodating space 16, therefore, the equal spacing arrangement between the surface of the display area 22 facing the second plane 12 and the second plane 12 is ensured, and the uniformity of the display brightness of the display area 22 is improved.

In this embodiment, as shown in fig. 8, an end of the non-display area 21 close to the display area 22 may extend toward the display area 22 to connect with the display area 22, so that a surface of the non-display area 21 facing the first plane 11 is higher than an end of the display area 22 facing the second plane 12, and the display area 22 and the second plane 12 are disposed at equal intervals. The display area 22 and the non-display area 21 can be connected by a connecting part with a special-shaped structure.

It should be noted that, in this embodiment, the height of the non-display area 21 facing the first plane 11 is higher than the height of the display area 22 facing the second plane 12, the height of the first plane 11 is lower than the second plane 12, and the distance between the display area 22 facing the second plane 12 and the second plane 12 together form the height value of the accommodating space 16, and the specific setting and calculation method may refer to the sixth embodiment, which is not described again in this embodiment.

In the optical fingerprint system under the screen provided by this embodiment, the optical fingerprint identification module is disposed below the non-display area 21 of the liquid crystal panel 20 and is located in the accommodating space 16 formed by the backlight module 10 in the non-display area 21 through a sinking design, specifically, by making the surface of the non-display area 21 facing the first plane 11 of the backlight module 10 higher than the surface of the display area 22 facing the second plane 12 of the backlight module 10 in the vertical direction, and the surface of the non-display area 21 facing the first plane 11 and the first plane 11 together form the accommodating space 16, the optical fingerprint identification module is disposed in the accommodating space 16, thereby ensuring the equidistant arrangement between the surface of the display area 22 facing the second plane 12 and the second plane 12, and improving the uniformity of the display brightness of the display area 22.

Example ten

A fourth aspect of the present invention provides an electronic device, where the electronic device includes the optical fingerprint system under the screen in any of the above embodiments, and the electronic device may be an electronic product or a component such as a liquid crystal display device, electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, a fingerprint lock, and the like.

Fig. 9A is a schematic structural diagram of a backlight module according to another embodiment of the invention; fig. 9B is a schematic structural diagram of a backlight module according to another embodiment of the invention.

As shown in fig. 9A and 9B, the backlight module 200 is adjacent to the liquid crystal panel 300, and the backlight module 200 includes an adjacent light source assembly 201 and a light guide assembly 202; light guide assembly 202 includes a first light guide portion 210 and a second light guide portion 220; in the vertical direction of the liquid crystal panel 300, the minimum distance between any position of the second light guide part 220 and the liquid crystal panel 300 is smaller than the minimum distance between any position of the first light guide part 210 and the liquid crystal panel 300; the first light guide part 210 is provided with a plurality of first light uniformizing structures 211, the second light guide part 220 is provided with a plurality of second light uniformizing structures 221, and the first light uniformizing structures 211 and the second light uniformizing structures 221 are used for making brightness of light rays of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide part 210 and the second light guide part 220 uniform, respectively.

In another embodiment of the present invention, the backlight module 200 is the same as the backlight module 10 of the above embodiment, the liquid crystal panel 300 is the same as the liquid crystal panel 20 of the above embodiment, and the light source assembly 201 is the same as the light source assembly 13 of the above embodiment.

In another embodiment of the present invention, the backlight module 200 is adjacent to the liquid crystal panel 300, the backlight module 200 includes an adjacent light source assembly 201 and a light guide assembly 202, the light guide assembly 202 includes a first light guide portion 210 and a second light guide portion 220; the light of the light source assembly 201 may enter the first light guide portion 210 from one side of the light guide assembly 202 and then reach the second light guide portion 220; alternatively, the light of the light source assembly 201 may enter the first light guide portion 210 and the second light guide portion 220 from the side of the light guide assembly 202 away from the liquid crystal panel 300; a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, and another part of the light reaches the liquid crystal panel 300 through the first light guide part 210 and the second light guide part 220; alternatively, a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, and another part of the light reaches the liquid crystal panel 300 through the second light guide part 220. The minimum distance between any position of the second light guide part 220 and the liquid crystal panel 300 is smaller than the minimum distance between any position of the first light guide part 210 and the liquid crystal panel 300; the optical path of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide portion 210 is different from the optical path of the light source assembly 201 reaching the liquid crystal panel 300 through the second light guide portion 220, and the attenuation of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide portion 210 is different from the attenuation of the light source assembly 201 reaching the liquid crystal panel 300 through the second light guide portion 220. The first light guide part 210 is provided with a plurality of first light uniformizing structures 211, the first light uniformizing structures 211 adjust the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide part 210, the second light guide part 220 is provided with a plurality of second light uniformizing structures 221, the second light uniformizing structures 221 adjust the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through the second light guide part 220, and further the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide part 210 and the second light guide part 220 is uniform, so that the problem that the light brightness of the liquid crystal panel 300 is uneven due to the attenuation difference between the light of the light source assembly 201 passing through the first light guide part 210 and the light of the light source assembly 201 passing through the second light guide part.

As shown in fig. 9A and 9B, the first light guide portion 210 and the second light guide portion 220 are integrally formed to constitute the light guide unit 202.

In another embodiment of the present invention, the first light guide portion 210 and the second light guide portion 220 are integrally formed to form the light guide assembly 202; the light of the light source assembly 201 may enter the first light guide portion 210 from one side of the light guide assembly 202 and then reach the second light guide portion 220; alternatively, the light of the light source assembly 201 may enter the first light guide portion 210 and the second light guide portion 220 from the side of the light guide assembly 202 away from the liquid crystal panel 300; a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, and another part of the light reaches the liquid crystal panel 300 through the first light guide part 210 and the second light guide part 220; alternatively, a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, and another part of the light reaches the liquid crystal panel 300 through the second light guide part 220.

As shown in fig. 9A, 9B, and 10, the first light guide portion 210 and the second light guide portion 220 are connected to each other to form the light guide unit 202.

In another embodiment of the present invention, the first light guide part 210 and the second light guide part 220 are connected to each other to form the light guide assembly 202; the light of the light source assembly 201 may enter the first light guide portion 210 from one side of the light guide assembly 202 and then reach the second light guide portion 220; alternatively, the light of the light source assembly 201 may enter the first light guide portion 210 and the second light guide portion 220 from the side of the light guide assembly 202 away from the liquid crystal panel 300; a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, and another part of the light reaches the liquid crystal panel 300 through the first light guide part 210 and the second light guide part 220; alternatively, a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, and another part of the light reaches the liquid crystal panel 300 through the second light guide part 220.

Fig. 10 is a schematic structural diagram of a backlight module according to another embodiment of the invention.

As shown in fig. 10, the light guide assembly 202 further includes a light guide plate connecting portion 230 located between the first light guide portion 210 and the second light guide portion 220, the light guide plate connecting portion 230 is provided with a plurality of third light uniformizing structures 231, and the third light uniformizing structures 231 are used for making brightness of light rays of the light source assembly 201 reaching the liquid crystal panel 300 through the light guide plate connecting portion 230 and the first light guide portion 210 and the second light guide portion 220 uniform, respectively.

In another embodiment of the present invention, the light of the light source assembly 201 can first enter the first light guide portion 210 from one side of the light guide assembly 202, and then reach the light guide plate connecting portion 230 and the second light guide portion 220; alternatively, the light of the light source assembly 201 may enter the first light guide portion 210, the light guide plate connecting portion 230, and the second light guide portion 220 from the side of the light guide assembly 202 away from the liquid crystal panel 300; a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, another part of the light reaches the liquid crystal panel 300 through the first light guide part 210 and the light guide plate connecting part 230, and another part of the light reaches the liquid crystal panel 300 through the first light guide part 210, the light guide plate connecting part 230 and the second light guide part 220; alternatively, a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, another part of the light reaches the liquid crystal panel 300 through the light guide plate connecting part 230, and another part of the light reaches the liquid crystal panel 300 through the second light guide part 220. The optical path of the light source assembly 201 reaching the liquid crystal panel 300 through the light guide plate connection part 230 is different from the optical path of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide part 210 and is also different from the optical path of the light source assembly 201 reaching the liquid crystal panel 300 through the second light guide part 220. The attenuation of the light source assembly 201 reaching the liquid crystal panel 300 through the light guide plate connection part 230 is different from the attenuation of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide part 210 and the attenuation of the light source assembly 201 reaching the liquid crystal panel 300 through the second light guide part 220. The light guide plate connection part 230 is provided with a plurality of third light-homogenizing structures 231, and the third light-homogenizing structures 231 adjust the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through the light guide plate connection part 230. The third light uniformizing structure 231 is used for making the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through the light guide plate connecting portion 230 and the first light guide portion 210 and the second light guide portion 220 uniform, so as to prevent the light of the light source assembly 201 from being uneven in the brightness of the light emitted from the liquid crystal panel 300 due to the attenuation difference of the light source assembly 201 through the first light guide portion 210, the light of the light guide plate connecting portion 230 and the light of the light guide portion 220.

Fig. 11 is a schematic structural diagram of a backlight module according to another embodiment of the invention.

As shown in fig. 11, the first light uniformizing structures 211 are non-uniformly distributed in the first light guiding part 210.

In another embodiment of the present invention, when the light of the light source assembly 201 enters the first light guide portion 210 from one side of the light guide assembly 202, the light paths of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the first light guide portion 210 are different, and the attenuation of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the first light guide portion 210 is different. The first light uniformizing structures 211 are non-uniformly distributed in the first light guide portion 210, and the first light uniformizing structures 211 adjust the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the first light guide portion 210, so that the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the first light guide portion 210 is uniform.

Fig. 12 is a schematic structural diagram of a backlight module according to another embodiment of the invention.

As shown in fig. 11 and 12, the density or size of the first dodging structure 211 at any position of the first light-guiding portion 210 is positively correlated with the optical path length of the light ray of the light source assembly 201 reaching the position in the first light-guiding portion 210, and with the minimum distance from the position in the first light-guiding portion 210 to the liquid crystal panel 300.

In another embodiment of the present invention, when the light of the light source assembly 201 enters the first light guide portion 210 from one side of the light guide assembly 202, the light paths of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the first light guide portion 210 are different, and the attenuation of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the first light guide portion 210 is different. In the backlight module 200, the density or size of the first light uniformizing structures 211 at any position of the first light guide part 210 is positively correlated with the optical path length of the light source assembly 201 reaching the position in the first light guide part 210, and is positively correlated with the minimum distance from the position in the first light guide part 210 to the liquid crystal panel 300; at any position in the first light guide part 210, the greater the optical path length of the light ray of the light source assembly 201 reaching the position in the first light guide part 210, the greater the density or size of the first light uniformizing structures 211 at the position in the first light guide part 210, and the greater the minimum distance from the position in the first light guide part 210 to the liquid crystal panel 300, the greater the density or size of the first light uniformizing structures 211 at the position in the first light guide part 210; on one hand, the greater the density or size of the first light unifying structure 211 at the position in the first light guide part 210, the higher the light extraction rate at the position in the first light guide part 210; on the other hand, the greater the optical path length of the light source assembly 201 reaching the position in the first light guide part 210, the greater the attenuation of the light source assembly 201 from the light source assembly 201 to the position in the first light guide part 210, and the greater the minimum distance from the position in the first light guide part 210 to the liquid crystal panel 300, the greater the attenuation of the light source assembly 201 from the position in the first light guide part 210 to the liquid crystal panel 300; here, the light extraction rate of each position in the first light guide portion 210 is changed to compensate for the difference in attenuation of the light source assembly 201 from the light source assembly 201 to each position in the first light guide portion 210 and the difference in attenuation of the light source assembly 201 from each position in the first light guide portion 210 to the liquid crystal panel 300, so that the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through each position in the first light guide portion 210 is uniform.

Fig. 13 is a schematic structural diagram of a backlight module according to another embodiment of the invention.

As shown in fig. 13, the second light uniformizing structure 221 is non-uniformly distributed in the second light guiding part 220.

In another embodiment of the present invention, when the light of the light source assembly 201 enters the first light guide portion 210 from one side of the light guide assembly 202 and reaches the second light guide portion 220, the light paths of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the second light guide portion 220 are different, and the attenuation of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the second light guide portion 220 is different. The second light uniformizing structures 221 are non-uniformly distributed in the second light guiding portion 220, and the second light uniformizing structures 221 adjust the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the second light guiding portion 220, so that the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the second light guiding portion 220 is uniform.

Fig. 14 is a schematic structural diagram of a backlight module according to another embodiment of the invention.

As shown in fig. 13 and 14, the minimum distances from the respective positions of the second light guide part 220 to the liquid crystal panel 300 are equal, and the density or size of the second light uniformizing structures 221 at any one position of the second light guide part 220 is positively correlated with the optical path length of the light source assembly 201 reaching the position in the second light guide part 220.

In another embodiment of the present invention, when the light of the light source assembly 201 enters the first light guide portion 210 from one side of the light guide assembly 202, the light paths of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the second light guide portion 220 are different, and the attenuation of the light source assembly 201 reaching the liquid crystal panel 300 through different positions in the second light guide portion 220 is different. In the backlight module 200, the minimum distances from the respective positions of the second light guide part 220 to the liquid crystal panel 300 are equal, and the attenuation of the light source assembly 201 from the respective positions of the second light guide part 220 to the liquid crystal panel 300 is equal. The size of the second light uniformizing structure 221 at any position of the second light guide part 220 is positively correlated with the optical path length of the light source assembly 201 reaching the position in the second light guide part 220; at any position of the second light guide part 220, the greater the optical path length of the light rays of the light source assembly 201 reaching the position in the second light guide part 220, the greater the density or size of the second light homogenizing structure 221 at the position in the second light guide part 220; on the one hand, the greater the density or size of the second light uniformizing structures 221 at the position in the second light guiding part 220, the higher the light extraction rate at the position in the second light guiding part 220; on the other hand, the greater the optical path length of the light source module 201 reaching the position in the second light guide part 220, the greater the attenuation of the light source module 201 from the light source module 201 to the position in the second light guide part 220; here, the light extraction rate of each position in the second light guide part 220 is changed to compensate for the attenuation difference of the light source assembly 201 from the light source assembly 201 to each position in the second light guide part 220, so that the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through each position in the second light guide part 220 is uniform.

As shown in fig. 9A to 14, in the backlight module 200, the first light uniformizing structure 211, the second light uniformizing structure 221, and the third light uniformizing structure 231 have light guide particle structures and are respectively disposed in the first light guide portion 210, the second light guide portion 220, and the light guide plate connection portion 230.

In another embodiment of the present invention, in the backlight module 200, the first light uniformizing structure 211, the second light uniformizing structure 221, and the third light uniformizing structure 231 have light guiding particle structures and are respectively disposed in the first light guiding portion 210, the second light guiding portion 220, and the light guiding plate connecting portion 230, when the light of the light source assembly 201 enters the first light guiding portion 210 from one side of the light guiding assembly 202, the light guiding particle structure of the first light uniformizing structure 211 adjusts the brightness of the light source assembly 201 from the light source assembly 201 to the first light guiding portion 210, and further adjusts the brightness of the light source assembly 201 from the first light guiding portion 210 to the liquid crystal panel 300, the light guiding particle structure of the second light uniformizing structure 221 adjusts the brightness of the light source assembly 201 from the light source assembly 201 to the second light guiding portion 220, and further adjusts the brightness of the light source assembly 201 from the second light guiding portion 220 to the liquid crystal panel 300, and the light guiding particle structure of the And further, the brightness of the light source assembly 201 from the light guide plate connection part 230 to the liquid crystal panel 300 is adjusted, and the light guide particle structures of the first light uniformizing structure 211, the second light uniformizing structure 221 and the third light uniformizing structure 231 respectively change the light emitting rate of the first light guide part 210, the light emitting rate of the second light guide part 220 and the light emitting rate of the light guide plate connection part 230, compensate the attenuation difference of the light source assembly 201 from the light source assembly 201 to the first light guide part 210, the second light guide part 220 and the light guide plate connection part 230 and the attenuation difference of the light source assembly 201 from the first light guide part 210, the second light guide part 220 and the light guide plate connection part 230 to the liquid crystal panel 300, so that the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide part 210.

Fig. 15 is a schematic structural diagram of a backlight module according to another embodiment of the invention.

As shown in fig. 15, in the backlight module 200, the first light uniformizing structure 211, the second light uniformizing structure 221, and the third light uniformizing structure 231 have protruding light guide structures and are respectively disposed on the surface of the first light guide portion 210, the surface of the second light guide portion 220, and the surface of the light guide plate connection portion 230.

In another embodiment of the present invention, in the backlight module 200, the first light uniformizing structure 211, the second light uniformizing structure 221 and the third light uniformizing structure 231 have protruding light guiding structures and are respectively disposed on the surface of the first light guiding portion 210, the surface of the second light guiding portion 220 and the surface of the light guiding plate connecting portion 230, when the light of the light source assembly 201 is incident on the first light guiding portion 210 from one side of the light guiding assembly 202, the protruding light guiding structure of the first light uniformizing structure 211 adjusts the brightness of the light source assembly 201 from the light source assembly 201 to the first light guiding portion 210, and further adjusts the brightness of the light source assembly 201 from the first light guiding portion 210 to the liquid crystal panel 300, the protruding light guiding structure of the second light uniformizing structure 221 adjusts the brightness of the light source assembly 201 from the light source assembly 201 to the second light guiding portion 220, and further adjusts the brightness of the light of, the protruding light guide structure of the third light unifying structure 231 adjusts the brightness of the light source assembly 201 from the light source assembly 201 to the light guide plate connecting part 230, further adjusting the brightness of the light source assembly 201 from the light guide plate connecting part 230 to the liquid crystal panel 300, the protruding light guide structures of the first light uniformizing structure 211, the second light uniformizing structure 221 and the third light uniformizing structure 231 respectively change the light emitting rate of the first light guide part 210, the light emitting rate of the second light guide part 220 and the light emitting rate of the light guide plate connecting part 230, compensate the attenuation difference of the light source assembly 201 from the light source assembly 201 to the first light guide part 210, the second light guide part 220 and the light guide plate connecting part 230 and the attenuation difference of the light source assembly 201 from the first light guide part 210, the second light guide part 220 and the light guide plate connecting part 230 to the liquid crystal panel 300, so that the brightness of the light from the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide part 210, the second light guide part 220, and the light guide plate connection part 230 is uniform.

Fig. 16 is a schematic structural diagram of a backlight module according to another embodiment of the invention.

As shown in fig. 16, in the backlight module 200, the first light uniformizing structure 211, the second light uniformizing structure 221, and the third light uniformizing structure 231 have a concave light guiding structure and are respectively disposed on the surface of the first light guiding portion 210, the surface of the second light guiding portion 220, and the surface of the light guiding plate connecting portion 230.

In another embodiment of the present invention, in the backlight module 200, the first light uniformizing structure 211, the second light uniformizing structure 221, and the third light uniformizing structure 231 have concave light guiding structures and are respectively disposed on the surface of the first light guiding portion 210, the surface of the second light guiding portion 220, and the surface of the light guiding plate connecting portion 230, when the light of the light source assembly 201 is incident to the first light guiding portion 210 from one side of the light guiding assembly 202, the concave light guiding structure of the first light uniformizing structure 211 adjusts the brightness of the light source assembly 201 from the light source assembly 201 to the first light guiding portion 210, and further adjusts the brightness of the light source assembly 201 from the first light guiding portion 210 to the liquid crystal panel 300, the concave light guiding structure of the second light uniformizing structure 221 adjusts the brightness of the light 201 from the light source assembly 201 to the second light guiding portion 220, and further adjusts the brightness of the light, the recessed light guide structure of the third light unifying structure 231 adjusts the brightness of the light source assembly 201 from the light source assembly 201 to the light guide plate connecting part 230, further adjusting the brightness of the light source assembly 201 from the light guide plate connecting portion 230 to the liquid crystal panel 300, the concave light guide structures of the first light uniformizing structure 211, the second light uniformizing structure 221 and the third light uniformizing structure 231 respectively change the light emitting rate of the first light guide portion 210, the light emitting rate of the second light guide portion 220 and the light emitting rate of the light guide plate connecting portion 230, compensate the attenuation difference of the light source assembly 201 from the light source assembly 201 to the first light guide portion 210, the second light guide portion 220 and the light guide plate connecting portion 230 and the attenuation difference of the light source assembly 201 from the first light guide portion 210, the second light guide portion 220 and the light guide plate connecting portion 230 to the liquid crystal panel 300, so that the brightness of the light from the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide part 210, the second light guide part 220, and the light guide plate connection part 230 is uniform.

Fig. 17 is a schematic structural diagram of a backlight module according to another embodiment of the invention; FIG. 18 is a schematic structural diagram of a backlight module according to another embodiment of the present invention; fig. 19 is a schematic structural diagram of a backlight module according to another embodiment of the invention.

As shown in fig. 9A and 17 to 19, in the backlight module 200, the first light unifying structure 211, the second light unifying structure 221, and the third light unifying structure 231 have one of a rectangle, a triangle, a circle, and an ellipse.

In another embodiment of the present invention, in the backlight module 200, the first light homogenizing structure 211, the second light homogenizing structure 221, and the third light homogenizing structure 231 have one of a rectangle, a triangle, a circle, and an ellipse, when the light of the light source assembly 201 enters the first light guiding portion 210 from one side of the light guiding assembly 202, the first light homogenizing structure 211 of the rectangle, the triangle, the circle, and the ellipse adjusts the brightness of the light source assembly 201 from the light source assembly 201 to the first light guiding portion 210, and further adjusts the brightness of the light source assembly 201 from the first light guiding portion 210 to the liquid crystal panel 300, the second light homogenizing structure 221 of the rectangle, the triangle, the circle, and the ellipse adjusts the brightness of the light source assembly 201 from the light source assembly 201 to the second light guiding portion 220, and further adjusts the brightness of the light source assembly 201 from the second light guiding portion 220 to the liquid crystal panel 300, and the third light homogenizing structure 231 of the rectangle, the triangle, the circle 230 and further adjusting the brightness of the light source assembly 201 from the light guide plate connection portion 230 to the liquid crystal panel 300, the first light homogenizing structure 211, the second light homogenizing structure 221 and the third light homogenizing structure 231 in the shape of rectangle, triangle, circle and ellipse respectively change the light emitting rate of the first light guide portion 210, the light emitting rate of the second light guide portion 220 and the light emitting rate of the light guide plate connection portion 230, compensate the attenuation difference of the light source assembly 201 from the light source assembly 201 to the first light guide portion 210, the second light guide portion 220 and the light guide plate connection portion 230 and the attenuation difference of the light source assembly 201 from the first light guide portion 210, the second light guide portion 220 and the light guide plate connection portion 230 to the liquid crystal panel 300, so that the brightness of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide portion 210, the second light guide portion 220.

Fig. 20 is a schematic structural diagram of an optical fingerprint system according to another embodiment of the present invention.

As shown in fig. 20, the off-screen optical fingerprint system 400 is applied to an electronic device including a liquid crystal panel 300 and a backlight module 200; the liquid crystal panel 300 includes adjacent display areas AA and non-display areas NA; the minimum distance between the backlight module 200 and the non-display area NA is larger than the minimum distance between the backlight module 200 and the display area AA; optical fingerprint system 400 includes optical fingerprint identification module 410 under the screen, and optical fingerprint identification module 410 sets up between backlight unit 200 and non-display area NA.

In another embodiment of the present invention, the minimum distance between the backlight module 200 and the non-display area NA is greater than the minimum distance between the backlight module 200 and the display area AA, so as to form an accommodating space between the backlight module 200 and the non-display area NA; the optical fingerprint identification module 410 is disposed between the backlight module 200 and the non-display area NA so as to receive the optical fingerprint signal between the backlight module 200 and the non-display area NA. When a finger contacts the surface of the liquid crystal panel 300 far away from the backlight module 200, the light of the backlight module 200 is reflected to the optical fingerprint identification module 410 by the finger through the liquid crystal panel 300; optical fingerprint identification module 410 receives optical fingerprint signal to carry out fingerprint identification.

As shown in fig. 20, the backlight assembly 200 includes a first backlight region BL1, a second backlight region BL2, and a third backlight region BL 3; the first backlight region BL1 is disposed opposite to the non-display region NA, the second backlight region BL2 and the third backlight region BL3 are disposed opposite to the display region AA, the minimum distance between the first backlight region BL1 and the non-display region NA is greater than the minimum distance between the third backlight region BL3 and the display region AA, and the second backlight region BL2 is connected to the first backlight region BL1 and the third backlight region BL 3.

In another embodiment of the present invention, the first backlight region BL1 is disposed opposite to the non-display region NA, the second backlight region BL2 and the third backlight region BL3 are disposed opposite to the display region AA, and a minimum distance between the first backlight region BL1 and the non-display region NA is greater than a minimum distance between the third backlight region BL3 and the display region AA, so that the optical fingerprint identification module 410 is disposed between the backlight module 200 and the non-display region NA to receive the optical fingerprint signal between the backlight module 200 and the non-display region NA. The second backlight region BL2 is connected to the first backlight region BL1 and to the third backlight region BL3, so that the backlight light passes through the first backlight region BL1, the second backlight region BL2 and the third backlight region BL3 in succession to reach the liquid crystal panel 300.

As shown in fig. 20, the light guide assembly 202 is bent at the second backlight region BL2 toward a side away from the liquid crystal panel 300, the first light guide part 210 is located in the second backlight region BL2, and the second light guide part 220 is located in the third backlight region BL 3.

In another embodiment of the present invention, the light guide assembly 202 is bent at the second backlight area BL2 toward a side away from the liquid crystal panel 300, the first light guide part 210 is located in the second backlight area BL2, and the second light guide part 220 is located in the third backlight area BL3, so that the minimum distance between the first backlight area BL1 and the non-display area NA is greater than the minimum distance between the third backlight area BL3 and the display area AA, so as to dispose the optical fingerprint identification module 410 between the backlight module 200 and the non-display area NA, so as to receive the optical fingerprint signal between the backlight module 200 and the non-display area NA.

As shown in fig. 9A, 9B and 20, the light source assembly 201 is located on a side of the first light guide portion 210 away from the second light guide portion 220, or on a side of the light guide assembly 202 away from the liquid crystal panel 300.

In another embodiment of the present invention, the light source assembly 201 is located at a side of the first light-guiding portion 210 away from the second light-guiding portion 220, or at a side of the light-guiding assembly 202 away from the liquid crystal panel 300; the light of the light source assembly 201 may enter the first light guide portion 210 from one side of the light guide assembly 202 and then reach the second light guide portion 220; alternatively, the light of the light source assembly 201 may enter the first light guide portion 210 and the second light guide portion 220 from the side of the light guide assembly 202 away from the liquid crystal panel 300; a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, and another part of the light reaches the liquid crystal panel 300 through the first light guide part 210 and the second light guide part 220; alternatively, a part of the light source assembly 201 reaches the liquid crystal panel 300 through the first light guide part 210, and another part of the light reaches the liquid crystal panel 300 through the second light guide part 220.

As shown in fig. 20, the backlight module 200 further includes a reflective film 203, a diffusion sheet 204, a lower prism film 205, an upper prism film 206, and an iron frame 207; the bezel 207 accommodates the light source assembly 201, the light guide assembly 202, the reflective film 203, the diffusion sheet 204, the lower prism film 205, and the upper prism film 206; the reflective film 203 is disposed on a side of the light guide assembly 202 away from the liquid crystal panel 300, and the diffusion sheet 204, the lower prism film 205, and the upper prism film 206 are sequentially disposed on a side of the light guide assembly 202 close to the liquid crystal panel 300.

In another embodiment of the present invention, the reflective film 203, the light guide assembly 202, the diffuser 204, the lower prism film 205, and the upper prism film 206 are disposed in the bezel 207 from bottom to top, and the side of the reflective film 203, the side of the light guide assembly 202, the side of the diffuser 204, the side of the lower prism film 205, or the side of the upper prism film 206 and the side of the bezel 206 are fixed by a bezel wrapping 208. The bottom and sides of the bezel 206 are closed and the upper portion of the bezel 206 exposes the upper prism film 205. The light of the light source assembly 201 enters the light guide assembly 202, a portion of the light turns to travel upward and then reaches the liquid crystal panel 300 through the diffusion sheet 204, the lower prism film 205 and the upper prism film 206, and another portion of the light turns to travel downward and is reflected at the reflection film 203 and then reaches the liquid crystal panel 300 through the light guide assembly 202, the diffusion sheet 204, the lower prism film 205 and the upper prism film 206.

As shown in fig. 20, the reflective film 203, the diffusion sheet 204, the lower prism film 205, the upper prism film 206, and the bezel 207 are bent toward the side away from the liquid crystal panel 300 at the second backlight area BL 2.

In another embodiment of the present invention, the reflective film 203, the diffusion sheet 204, the lower prism film 205, the upper prism film 206, and the bezel 207 are bent toward a side away from the liquid crystal panel 300 at the second backlight area BL2, so that a minimum distance between the first backlight area BL1 and the non-display area NA is greater than a minimum distance between the third backlight area BL3 and the display area AA, so as to dispose the optical fingerprint recognition module 410 between the backlight module 200 and the non-display area NA, so as to receive the optical fingerprint signal between the backlight module 200 and the non-display area NA.

As shown in fig. 20, the light of the light source assembly 201 reaches the optical fingerprint identification module 410 when the light is reflected by the surface of the liquid crystal panel 300 away from the backlight module 200.

In another embodiment of the present invention, when a finger contacts a surface of the liquid crystal panel 300 far away from the backlight module 200, the light of the backlight module 200 is reflected to the optical fingerprint identification module 410 by the finger through the liquid crystal panel 300; optical fingerprint identification module 410 receives optical fingerprint signal to carry out fingerprint identification.

As shown in fig. 21, the display module 500 includes a backlight module 200 adjacent to each other, and a liquid crystal panel 300, wherein the backlight module 200 includes a light source assembly 201 and a light guide assembly 202 adjacent to each other; light guide assembly 202 includes a first light guide portion 210 and a second light guide portion 220; in the vertical direction of the liquid crystal panel 300, the minimum distance between any position of the second light guide part 220 and the liquid crystal panel 300 is smaller than the minimum distance between any position of the first light guide part 210 and the liquid crystal panel 300; the first light guide part 210 is provided with a plurality of first light uniformizing structures 211, the second light guide part 220 is provided with a plurality of second light uniformizing structures 221, and the first light uniformizing structures 211 and the second light uniformizing structures 221 are used for making brightness of light rays of the light source assembly 201 reaching the liquid crystal panel 300 through the first light guide part 210 and the second light guide part 220 uniform, respectively.

Another embodiment of the present invention provides an electronic device, which includes the optical fingerprint system under a screen in any of the above embodiments, and the electronic device may be an electronic product or a component such as a liquid crystal display device, electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, a fingerprint lock, and the like.

In summary, the present invention provides a backlight module, an optical fingerprint system under a screen, a display module and an electronic device. The backlight module is close to the liquid crystal panel and comprises a light source component and a light guide component which are adjacent; the light guide assembly comprises a first light guide part and a second light guide part; in the vertical direction of the liquid crystal panel, the minimum distance between any position in the second light guide part and the liquid crystal panel is smaller than the minimum distance between any position in the first light guide part and the liquid crystal panel; the first light guide part is provided with a plurality of first light homogenizing structures, the second light guide part is provided with a plurality of second light homogenizing structures, and the first light homogenizing structures and the second light homogenizing structures are used for enabling the brightness of light rays of the light source component to reach the liquid crystal panel through the first light guide part and the second light guide part to be uniform. In the invention, the first light homogenizing structure and the second light homogenizing structure avoid the uneven brightness of the liquid crystal panel caused by the attenuation difference of the light source component passing through the first light guide part and the attenuation difference of the light source component passing through the second light guide part.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

A backlight module is close to a liquid crystal panel and is characterized in that the backlight module comprises a light source component and a light guide component which are adjacent;

the light guide assembly comprises a first light guide part and a second light guide part;

in the vertical direction of the liquid crystal panel, the minimum distance between any position in the second light guide part and the liquid crystal panel is smaller than the minimum distance between any position in the first light guide part and the liquid crystal panel;

the first light guide part is provided with a plurality of first light-homogenizing structures, the second light guide part is provided with a plurality of second light-homogenizing structures, and the first light-homogenizing structures and the second light-homogenizing structures are used for enabling the brightness of light rays of the light source assembly to reach the liquid crystal panel through the first light guide part and the second light guide part to be uniform.
The backlight module as claimed in claim 1, wherein the first light guide portion and the second light guide portion are integrally formed to form the light guide assembly.
The backlight module as claimed in claim 1, wherein the first light guide part and the second light guide part are connected to each other to form the light guide assembly.
The backlight module as claimed in claim 1, wherein the light guide assembly further includes a light guide plate connecting portion disposed between the first light guide portion and the second light guide portion, the light guide plate connecting portion is provided with a plurality of third light distributing structures, and the third light distributing structures are configured to make brightness of the light from the light source assembly reaching the liquid crystal panel through the light guide plate connecting portion and the first light guide portion and the second light guide portion respectively uniform.
A backlight module according to claim 1, wherein the first light unifying structures are non-uniformly distributed in the first light guiding portion.
The backlight module according to claim 1, wherein the density or size of the first light homogenizing structure at any position in the first light guide part is positively correlated with the optical path length of the light from the light source assembly to the position in the first light guide part, and with the minimum distance from the position in the first light guide part to the liquid crystal panel.
A backlight module according to claim 1, wherein the second light unifying structures are non-uniformly distributed in the second light guiding portion.
The backlight module according to claim 1, wherein the minimum distances from the respective positions in the second light guide part to the liquid crystal panel are equal, and the density or size of the second light uniformizing structures at any one position in the second light guide part is positively correlated to the optical path length of the light from the light source assembly to the position in the second light guide part.
The backlight module as claimed in claim 4, wherein the first, second and third light uniformizing structures have light guiding particle structures and are disposed in the first light guiding portion, the second light guiding portion and the light guiding plate connecting portion, respectively.
The backlight module as claimed in claim 4, wherein the first, second and third light uniformizing structures have protruding light guide structures and are disposed on the surface of the first light guide portion, the surface of the second light guide portion and the surface of the light guide plate connecting portion, respectively.
The backlight module as claimed in claim 4, wherein the first, second and third light uniformizing structures have concave light guiding structures and are disposed on the surfaces of the first and second light guiding parts and the light guiding plate connecting part, respectively.
A backlight module according to claim 4, wherein the first light unifying structure, the second light unifying structure and the third light unifying structure have one of a rectangular shape, a triangular shape, a circular shape and an elliptical shape.
An off-screen optical fingerprint system, applied to an electronic device comprising a liquid crystal panel and the backlight module according to any one of claims 1 to 12; the liquid crystal panel comprises a display area and a non-display area which are adjacent;

the minimum distance between the backlight module and the non-display area is larger than the minimum distance between the backlight module and the display area;

optical fingerprint system includes the optics fingerprint identification module under the screen, the optics fingerprint identification module set up in backlight unit with between the non-display area.
The off-screen optical fingerprint system of claim 13, wherein the backlight module comprises a first backlight area, a second backlight area, and a third backlight area;

the first backlight area and the non-display area are arranged oppositely, the second backlight area and the third backlight area are arranged oppositely to the display area, the minimum distance between the first backlight area and the non-display area is larger than the minimum distance between the third backlight area and the display area, and the second backlight area is connected with the first backlight area and the third backlight area.
The off-screen optical fingerprint system of claim 14, wherein the light guide assembly is bent at the second backlight area toward a side away from the liquid crystal panel, the first light guide portion is located at the second backlight area, and the second light guide portion is located at the third backlight area.
The off-screen optical fingerprint system of claim 14, wherein the light source assembly is located on a side of the first light guide portion away from the second light guide portion or on a side of the light guide assembly away from the liquid crystal panel.
The off-screen optical fingerprint system of claim 14, wherein the backlight module further comprises a reflective film, a diffuser, a lower prism film, an upper prism film, an iron frame;

the iron frame accommodates the light source assembly, the light guide assembly, the reflective film, the diffusion sheet, the lower prism film, and the upper prism film;

the reflection film is arranged on one side, far away from the liquid crystal panel, of the light guide assembly, and the diffusion sheet, the lower prism film and the upper prism film are sequentially arranged on one side, close to the liquid crystal panel, of the light guide assembly.
The off-screen optical fingerprint system of claim 17, wherein the reflective film, the diffuser sheet, the lower prism film, and the upper prism film are bent toward a side away from the liquid crystal panel at the second backlight area.
The system according to claim 14, wherein the light of the light source assembly reaches the optical fingerprint recognition module when the light is reflected by the surface of the liquid crystal panel away from the backlight module.
A display module comprises a backlight module and a liquid crystal panel which are adjacent, and is characterized in that the backlight module comprises a light source component and a light guide component which are adjacent;

the light guide assembly comprises a first light guide part and a second light guide part;

in the vertical direction of the liquid crystal panel, the minimum distance between any position in the second light guide part and the liquid crystal panel is smaller than the minimum distance between any position in the first light guide part and the liquid crystal panel;

the first light guide part is provided with a plurality of first light-homogenizing structures, the second light guide part is provided with a plurality of second light-homogenizing structures, and the first light-homogenizing structures and the second light-homogenizing structures are used for enabling the brightness of light rays of the light source assembly to reach the liquid crystal panel through the first light guide part and the second light guide part to be uniform.
An electronic device comprising the underscreen optical fingerprint system of any one of claims 13-19.