CN110826543B

CN110826543B - Display device and electronic apparatus

Info

Publication number: CN110826543B
Application number: CN201911314841.9A
Authority: CN
Inventors: 谢天旭
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2022-07-12
Anticipated expiration: 2039-12-19
Also published as: CN110826543A

Abstract

The invention discloses a display device and electronic equipment, which relate to the technical field of display and comprise a display panel and a backlight module, wherein the display panel comprises a first area and a second area, and the first area comprises a fingerprint identification area; the backlight module comprises a lateral backlight source and a light guide plate, the light guide plate comprises a first part and a second part, and the orthographic projection of the first part on the plane where the display panel is located is at least partially overlapped with the fingerprint identification area; the thickness of the first part is larger than that of the second part along the direction vertical to the plane of the display panel; the side-in backlight comprises a first LED and a second LED; the orthographic projection of the first LED on the plane where the display panel is located in a first area; the thickness of the first LED is larger than that of the second LED along the direction perpendicular to the plane of the display panel. This application is through the luminance in a poor light that increases the fingerprint identification district, improves the demonstration luminance in fingerprint identification district for display screen fingerprint identification district and non-fingerprint identification district luminance is even, improves the display effect.

Description

Display device and electronic apparatus

Technical Field

The present application relates to the field of display technologies, and in particular, to a display device and an electronic apparatus.

Background

In recent years, with the spread of mobile display products, information security is receiving much attention from consumers. Fingerprint identification has uniqueness, is difficult to duplicate, and is widely applied to aspects such as unblock, payment confirmation of mobile display product.

Along with the requirement of the user to display device's display effect is higher and higher, more producers are in order to promote visual experience, constantly reduce the area in non-display area, set up the fingerprint identification district in the display area of display screen to realize the display effect of full screen. However, when the fingerprint identification area is located in the display area, the fingerprint identification sensors need to be arranged in the fingerprint identification area, so that the light penetration rate of the fingerprint identification area is lower than that of other areas, the display brightness of the fingerprint identification area is lower than that of other areas, and the brightness of the display screen is uneven.

Disclosure of Invention

In view of this, the present application provides a display device and an electronic apparatus, which increase the backlight brightness of the fingerprint identification area and improve the display brightness of the fingerprint identification area, so that the brightness of the fingerprint identification area and the non-fingerprint identification area of the display screen is uniform, and the display effect is improved.

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

in a first aspect, the present application provides a display device including a display area and a non-display area surrounding the display area, including: the display panel is positioned on a light emitting surface of the backlight module;

the display panel comprises a first area and a second area which are arranged along a first direction, the first area and the second area both extend along a second direction, the first direction and the second direction are crossed, and the first area comprises at least one fingerprint identification area;

the backlight module comprises a lateral backlight source and a light guide plate, wherein a light emitting surface of the lateral backlight source is opposite to a light incident surface of the light guide plate; the light guide plate comprises a first part and a second part, and the orthographic projection of the first part on the plane of the display panel at least partially overlaps with the fingerprint identification area; the thickness of the first portion is d1, the thickness of the second portion is d2, and d1> d2 in the direction perpendicular to the plane of the display panel;

the side-in backlight comprises a plurality of LEDs arranged along the first direction, and the LEDs comprise a first LED and a plurality of second LEDs; the orthographic projection of the first LED on the plane of the display panel is positioned in the first area; the thickness of the first LED is h1, the thickness of the second LED is h2, and h1> h2 in the direction perpendicular to the plane of the display panel.

In a second aspect, the present application further provides an electronic device, including a display device, where the display device is the display device provided in the present application.

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

in the display device and the electronic equipment that this application provided, the area of going out the plain noodles is increased through the mode that increases the thickness of the first LED that corresponds with the fingerprint identification district to improve the luminance in fingerprint identification district, avoid because the lower problem that causes the fingerprint identification district picture darker of fingerprint identification district's penetration rate in fingerprint identification district. In addition, the reflectivity of light guide plate and its thickness are direct ratio relation, and the light guide plate thickness is the thicker more that it jets out, consequently, through the thickness that makes the first portion of light guide plate that fingerprint identification district corresponds be greater than the thickness in other regions in this application, make more light jet out from first portion to can further increase the display brightness in fingerprint identification district, be favorable to improving display device's demonstration homogeneity, improve display quality.

Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

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

fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view AA' of the display device of FIG. 1;

FIG. 3 is another cross-sectional view AA' of the display device of FIG. 1;

FIG. 4 shows a cross-sectional view BB' of the display device of FIG. 1;

FIG. 5 is a top view of a light guide plate according to an embodiment of the present disclosure;

FIG. 6 is a CC' sectional view of the light guide plate shown in FIG. 5;

FIG. 7 is a sectional view of the light guide plate of FIG. 5 showing a DD';

fig. 8 is a schematic diagram illustrating a connection relationship between a fingerprint recognition control chip and a fingerprint recognition sensor according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

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

In comprehensive screen display device, the fingerprint identification district is located the display area, and the fingerprint identification sensor is arranged in the fingerprint identification district, leads to the light penetration rate in fingerprint identification district to be less than other regions for the demonstration luminance in fingerprint identification district is less than the demonstration luminance in other regions, causes the uneven problem of display screen luminance.

In view of this, the present invention provides a display device and an electronic apparatus, which increase the backlight brightness of the fingerprint identification area to improve the display brightness of the fingerprint identification area, so that the brightness of the fingerprint identification area and the non-fingerprint identification area of the display screen is uniform, and the display effect is improved.

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

Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present application, fig. 2 is a cross-sectional view AA ' of the display device in fig. 1, fig. 3 is a cross-sectional view AA ' of the display device in fig. 1, fig. 4 is a cross-sectional view BB ' of the display device in fig. 1, and with reference to fig. 1 to 4, the present application provides a display device 100 including a display area 10 and a non-display area 20 surrounding the display area 10, and further including: the display device comprises a display panel 30 and a backlight module 40, wherein the display panel 30 is positioned on a light-emitting surface of the backlight module 40;

the display panel 30 includes a first area 31 and a second area 32 arranged in a first direction, the first area 31 and the second area 32 each extending in a second direction, the first direction and the second direction intersecting, the first area 31 including at least one fingerprint identification area 34;

the backlight module 40 includes a side-in type backlight 41 and a light guide plate 42, and a light emitting surface of the side-in type backlight 41 is opposite to a light incident surface of the light guide plate 42; the light guide plate 42 comprises a first portion 421 and a second portion 422, and the orthographic projection of the first portion 421 on the plane of the display panel 30 at least partially overlaps with the fingerprint identification area 34; in the direction perpendicular to the plane of the display panel 30, the thickness of the first portion 421 is d1, the thickness of the second portion 422 is d2, and d1> d 2;

the side-in backlight 41 includes a plurality of LEDs arranged along a first direction, and the LEDs include a first LED411 and a plurality of second LEDs 412; the orthographic projection of the first LED411 on the plane of the display panel 30 is positioned in the first area 31; in the direction perpendicular to the plane of the display panel 30, the thickness of the first LED411 is h1, the thickness of the second LED 412 is h2, and h1> h 2.

Specifically, referring to fig. 1 to 4, a display device 100 provided in the embodiment of the present application includes a display panel 30 and a backlight module 40, the display panel 30 is located on a light exit surface of the backlight module 40, the display panel 30 is divided into a first area 31 and a second area 32, the first area 31 and the second area 32 are arranged along a first direction and extend in a second direction, the first direction and the second direction are crossed, where the first direction and the second direction may be, for example, a row direction and a column direction, a fingerprint identification area 34 is disposed in the first area 31, and fingerprint identification is implemented by disposing a fingerprint identification sensor in the fingerprint identification area. The backlight module 40 includes a side-in type backlight 41 and a light guide plate 42, where the side-in type backlight 41 refers to that the backlight 41 is disposed on a side surface of the light guide plate 42, so that a light emitting surface 415 of the side-in type backlight 41 is opposite to a light incident surface 425 of the light guide plate 42, the light guide plate 42 includes a first portion 421 and a second portion 422, the side-in type backlight 41 includes a first LED411 and a second LED 412, a thickness d1 of the first portion 421 is greater than a thickness d2 of the second portion 422 along a direction perpendicular to a plane of the display panel 30, a thickness h1 of the first LED411 is greater than a thickness h2 of the second LED 412, a front projection of the first portion 421 on the plane of the display panel 30 at least partially overlaps with the fingerprint identification area 34, a front projection of the first LED411 on the plane of the display panel 30 is located in the first area 31, the LEDs emit light through phosphors located in the lamp body, and when a lamp body thickness of the LEDs increases, based on the fact that the light emitting surface 415 is increased, the light emitting brightness of the first LED411 is increased, and the thickness h1 of the first LED411 is larger than the thickness h2 of the second LED 412, so that the light emitting area of the first LED411 is increased, the first LED411 is located in the first area 31 where the fingerprint identification area 34 is located, the brightness of the fingerprint identification area 34 is improved, and the problem that the picture of the fingerprint identification area 34 is dark due to the fact that the penetration rate of the fingerprint identification area 34 is low is solved. In addition, the reflectivity of the light guide plate is in a proportional relationship with the thickness of the light guide plate, that is, the thicker the light guide plate is, the more light rays are emitted, so that the thickness of the first portion 421 of the light guide plate 42 corresponding to the fingerprint identification area 34 is set to be larger in the application, and more light rays can be emitted from the first portion 421, so that the brightness of the fingerprint identification area 34 can be further increased, the display uniformity of the display device 100 can be improved, and the display quality can be improved.

It should be noted that fig. 1 only schematically illustrates one positional relationship between the fingerprint identification area 34 and the first area 31, and does not represent an actual position, and in other embodiments, the fingerprint identification area 34 may be located at other positions, which is not limited in this application. In addition, the thicknesses of the light guide plate 42 and the LEDs in fig. 2 are also only schematic illustrations and do not represent actual thicknesses, in this application, the light emitting surface of the LED is opposite to the light incident surface of the light guide plate 42, and the LED may be of a top light emitting type or a side light emitting type, when the LED is of the top light emitting type, the LED is welded to the side surface of the back plate by a light bar, as shown in fig. 2, so that the light emitting surface of the LED is opposite to the light incident surface of the light guide plate; when the LED is of a side-emitting type, the LED is welded to the bottom surface of the back plate via the light bar, as shown in fig. 3, such that the light emitting surface of the LED is opposite to the light incident surface of the light guide plate. It should be noted that the height of the top emission type LED or the side emission type LED refers to a thickness in a direction perpendicular to a plane of the display panel 30, that is, a thickness of the lamp body in a direction parallel to the light emission surface. Except for the side-in backlight 41 and the light guide plate 42, the backlight module 40 further includes a backlight bezel and other optical films, and the detailed composition structures of the backlight module 40 and the display panel 30 are not described in detail herein.

Alternatively, referring to fig. 1 and 2, the fingerprint identification area 34 is located at an edge of the display area 10 near the first LED411, and is adjacent to the non-display area 20. Specifically, referring to fig. 1 and 2, since the thickness of the first LED411 is relatively large, and only the first portion 421 corresponding to the fingerprint identification area 34 in the light guide plate 42 is relatively large, and the thicknesses of the other portions of the light guide plate 42 are relatively small, when the fingerprint identification area 34 is located in the middle of the display area 10, the first portion 421 of the corresponding light guide plate 42 with relatively large thickness is also located in the middle of the display area 10, while the thickness of the light guide plate 42 opposite to the light emitting surface of the first LED411 is relatively small, the light emitting surface of the first LED411 is upward beyond the light incident surface 425 of the light guide plate 42 opposite thereto, and the light emitted from the first LED411 is not completely incident on the light incident surface 425 of the light guide plate 42, so that part of the light leaks to the outside, and the light utilization rate is reduced. Therefore, in the embodiment, the fingerprint identification area 34 is disposed at the edge of the display area 10 close to the first LED411, the first portion 421 of the light guide plate 42 is also located at the edge, and the thickness of the light guide plate 42 opposite to the light emitting surface of the first LED411 is large enough to ensure that all the light emitted by the first LED411 is incident on the light incident surface of the light guide plate 42, thereby avoiding the problem of light leakage.

Alternatively, referring to fig. 2 and 4, the thickness d1 of the first portion 421 is less than or equal to the thickness h1 of the first LED 411; the thickness d2 of the second section 422 is less than or equal to the thickness h2 of the second LED 412. Specifically, referring to fig. 2 and fig. 4, in a normal condition, the LED emits light through the phosphor in the lamp body, and the phosphor does not cover the LED entirely, that is, the area of the region covering the phosphor is smaller than the area of the lamp body of the LED along the direction perpendicular to the plane of the display panel 30, so that, as long as the projection of the region covering the phosphor on the light incident surface of the light guide plate 42 opposite to the light emitting surface 415 is located in the region defined by the light incident surface of the light guide plate 42, all the light emitted by the first LED411 can be incident on the light incident surface of the first portion 421, therefore, in the embodiment, the thickness d1 of the first portion 421 is set to be smaller than or equal to the thickness h1 of the first LED411, and the thickness d2 of the second portion 422 is set to be smaller than or equal to the thickness h2 of the second LED 412, so as to avoid light leakage, and reduce the thickness of the light guide plate 42 as much as possible, thereby reducing the overall thickness of the display device 100, the light and thin design is facilitated to be realized.

Optionally, referring to fig. 2 to 4, the thickness h1 of the first LED411 ranges from 0.4mm to 0.6mm, and the thickness h2 of the second LED 412 ranges from 0.3mm to 0.5 mm. Specifically, in the present embodiment, the thickness h1 of the first LED411 is set to range from 0.4mm to 0.6mm, where 0.4mm to 0.6mm includes 0.4mm and 0.6mm, the thickness h2 of the second LED 412 ranges from 0.3mm to 0.5mm, where 0.3mm to 0.5mm includes 0.3mm and 0.5mm, and the LED generally used for the display panel can range from 0.3mm to 0.6mm, because the thickness of the first LED is set to be greater than the thickness of the second LED in the present application, the thickness h1 of the first LED411 is set to range from 0.4mm to 0.6mm, and the thickness h2 of the second LED 412 is set to range from 0.3mm to 0.5mm, the LEDs are soldered on the circuit board by a bracket, and when the width of the LED and the bracket is wide, it is difficult to solder the LED bracket firmly, and the soldering brightness of the LED is increased, and the difficulty of the LED is also related to the LED bracket, when the LED is set too small, the luminance is low, and it is difficult to satisfy the display requirement. Certainly, the LED cannot be set too large, and although the light-emitting area of the LED is increased, the display brightness can be increased, when the LED is set to be large, the area occupied by the LED is also large, which is not favorable for realizing the narrow frame design. The value range of the LED is only an illustrative example, and is not limited to the present application, and in actual use, LEDs with other specifications may be selected as required. Preferably, h1-h2 is greater than or equal to 0.1mm, the thickness difference between the first LED411 and the second LED 412 is greater than or equal to 0.1mm in the embodiment, for example, when the thickness of the first LED411 is 0.5mm, an LED with the thickness of 0.4mm is selected as the second LED 412, at this time, the luminance of the first LED411 is 10.94lm, and the backlight luminance corresponding to the first LED411 is 5823cd/m²The luminance of the second LED 412 is 10.19lm, and the backlight luminance corresponding to the second LED 412 is 5296cd/m²Phase of changeCompared with the second LED 412, the luminance of the first LED411 is improved by 7.4%, and the backlight luminance is improved by 9.95%, so that the luminance of the fingerprint identification area 34 can be improved, and the problem that the picture of the fingerprint identification area 34 is darker due to the low penetration rate of the fingerprint identification area 34 is avoided, thereby being beneficial to improving the display uniformity of the display device 100 and improving the display quality.

Alternatively, please refer to FIGS. 2-4, h1-d1 is less than or equal to 0.05mm, and h2-d2 is less than or equal to 0.05 mm. Specifically, referring to fig. 2 to 4, in the embodiment, h1 to d1 are set to be equal to or less than 0.05mm, and h2 to d2 are set to be equal to or less than 0.05mm, for example, when the thickness of the first LED411 is 0.5mm and the thickness of the second LED 412 is 0.4mm, the thickness of the first portion may range from 0.45mm to 0.5mm, the thickness of the second portion may range from 0.35mm to 0.4mm, for example, the thickness of the first portion 421 is set to be 0.47mm, and the thickness of the second portion 422 is set to be 0.37 mm. Thickness through setting up LED and the thickness difference less than or equal to 0.05mm of light guide plate, ensure that the height that highly is greater than the light emitting area of the income plain noodles of light guide plate to avoid LED's light emitting area upwards to surpass rather than relative light guide plate 42's income plain noodles, guarantee that the whole income plain noodles that incite into light guide plate 42 of light that LED sent, avoid causing the light leak problem, can also minimize light guide plate 42's thickness, thereby reduce display device 100's thickness, be favorable to realizing frivolous design.

Optionally, fig. 5 is a top view of the light guide plate 42 provided in the embodiment of the present application, fig. 6 is a CC' cross-sectional view of the light guide plate 42 in fig. 5, please refer to fig. 5 and fig. 6, the first portion 421 includes a central region 423 and an edge region 424 surrounding the central region 423, a thickness of the central region 423 is greater than or equal to a thickness of the edge region 424. Specifically, referring to fig. 5, in the present embodiment, the first portion 421 is divided into a central region 423 and an edge region 424, the edge region 424 surrounds the central region 423, wherein the thickness of the central region 423 is greater than or equal to the thickness of the edge region 424, and here, the thickness of the first portion 421 may be reduced from the center to the edge region, so that the brightness of the light emitted from the first portion 421 gradually transitions from the central region 423 to the edge region 424 to the brightness of the light emitted from the second portion 422, and the brightness difference between the fingerprint identification region 34 and the non-fingerprint identification region 34 is reduced, which is beneficial to improving the display uniformity of the display device 100 and improving the display quality. It should be noted that, in the embodiment shown in fig. 6, the manner of dividing the first portion 421 of the light guide plate 42 into the central region 423 and the edge region 424 surrounding the central region 423 and making the edge region 424 excessively thinner is only a schematic illustration, and in other real-time examples, an edge of one side of the first portion 421 away from the light source may be excessively thinner, as shown in fig. 7, fig. 7 is a DD' cross-sectional view of the light guide plate 42 in fig. 5, or the thicknesses of the regions in the first portion 421 in fig. 2 are the same, which is not specifically limited in this application.

Optionally, with continued reference to fig. 2-4, the backlight module 40 further includes a reflective sheet 43, and the reflective sheet 43 is located on a side of the light guide plate 42 away from the display panel 30. Specifically, the backlight module 40 further includes a reflective sheet 43, the reflective sheet 43 is located on a side of the light guide plate 42 away from the display panel 30, that is, the reflective sheet 43 is located on a side of the light guide plate 42 away from the light exit surface, when the light source provided by the LED is emitted to the light exit surface through the light guide plate 42, a part of the light is guided out from the side away from the light exit surface, which will reduce the utilization rate of the light source, in order to improve the utilization rate of the light, the reflective sheet 43 is disposed on a side of the light guide plate 42 away from the light exit surface, and the light emitted from the light exit surface is reflected into the light guide plate 42 through the reflective sheet 43, so that the light emitted from the light exit surface can be emitted from the light exit surface of the light guide plate 42, which is favorable for improving the utilization rate of the light.

Optionally, fig. 8 is a schematic diagram illustrating a connection relationship between the fingerprint identification control chip 50 and the fingerprint identification sensor 341 according to an embodiment of the present application, please refer to fig. 8, in which the display device 100 further includes the fingerprint identification control chip 50; the fingerprint identification section 34 includes a plurality of fingerprint identification sensors 341 arranged in an array; the fingerprint sensor 341 is electrically connected to the fingerprint control chip 50. Specifically, the display device 100 further includes a fingerprint identification control chip 50, the fingerprint identification area 34 includes a plurality of fingerprint identification sensors 341, and the fingerprint identification sensors 341 are electrically connected with the fingerprint identification control chip 50, the fingerprint identification sensors 341 are controlled by the fingerprint identification control chip 50, the fingerprint identification sensors 341 are integrated on the array substrate, when the user finger contacts the screen, because the ridge and the valley of the fingerprint are different from the distance of the fingerprint identification sensors 341, the intensity of the reflected light is different, therefore, different capacitance values are formed at the positions corresponding to the ridge and the valley, because the capacitance values are different, the discharge speed of the pixel points corresponding to the ridge and the valley is different, therefore, the fingerprint identification control chip 50 corresponds to the charge and discharge of the pixel points according to the ridge and the valley, i.e., the fingerprint information of the user can be obtained. In this embodiment, the fingerprint identification control chip 50 can be bound to the Flexible Printed Circuit (FPC), so that a special installation space for the fingerprint identification control chip 50 is not required, the space of the display panel 30 is reasonably utilized, and space saving is facilitated.

Based on the same inventive concept, the present application further provides an electronic device 200, fig. 9 is a schematic structural diagram of the electronic device 200 provided in the embodiment of the present application, please refer to fig. 9, the electronic device 200 includes a display device 100, and the display device 100 is any one of the display devices 100 provided in the embodiments of the present application. It should be noted that, for the embodiments of the electronic device 200 provided in the present application, reference may be made to the embodiments of the display apparatus 100, and the same parts are not described again. The electronic device 200 provided by the present application may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

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

in display device and electronic equipment that this application provided, the area of going out the plain noodles is increased through the mode that increases the thickness of the first LED that corresponds with the fingerprint identification district to improve the luminance in fingerprint identification district, avoid the fingerprint identification district transmissivity lower and cause the darker problem of fingerprint identification district picture. In addition, the reflectivity of light guide plate and its thickness are direct ratio relation, and the light guide plate thickness is the thicker more that it jets out, consequently, through the thickness that makes the first portion of light guide plate that fingerprint identification district corresponds be greater than the thickness in other regions in this application, make more light jet out from first portion to can further increase the display brightness in fingerprint identification district, be favorable to improving display device's demonstration homogeneity, improve display quality.

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

Claims

1. A display device including a display area and a non-display area surrounding the display area, comprising: the display panel is positioned on a light emitting surface of the backlight module;

the backlight module comprises a lateral backlight source and a light guide plate, wherein a light emitting surface of the lateral backlight source is opposite to a light incident surface of the light guide plate; the light guide plate comprises a first part and a second part, and the orthographic projection of the first part on the plane of the display panel at least partially overlaps with the fingerprint identification area; in the direction perpendicular to the plane of the display panel, the thickness of the first portion is d1, the thickness of the second portion is d2, and d1> d 2;

the lateral backlight source comprises a plurality of LEDs arranged along the first direction, and the LEDs comprise a first LED and a plurality of second LEDs; the orthographic projection of the first LED on the plane of the display panel is positioned in the first area; the thickness of the first LED is h1, the thickness of the second LED is h2, and h1> h2 in the direction perpendicular to the plane of the display panel.

2. The display device according to claim 1,

the fingerprint identification area is located the display area is close to a side edge of first LED, and with the non-display area is adjacent.

3. The display device according to claim 2,

a thickness d1 of the first portion is less than or equal to a thickness h1 of the first LED; the thickness d2 of the second portion is less than or equal to the thickness h2 of the second LED.

4. The display device as claimed in claim 1, wherein h1-h2 is 0.1mm or more.

5. The display device according to claim 3,

h1-d1≤0.05mm，h2-d2≤0.05mm。

6. the display device according to claim 5,

the first portion includes a central region and an edge region surrounding the central region, and a thickness of the central region is equal to or greater than a thickness of the edge region.

7. The display device according to claim 2,

the backlight module further comprises a reflector plate, and the reflector plate is located on one side, far away from the display panel, of the light guide plate.

8. The display device according to claim 2, comprising a fingerprint recognition control chip;

the fingerprint identification area comprises a plurality of fingerprint identification sensors arranged in an array;

the fingerprint identification sensor is electrically connected with the fingerprint identification control chip.

9. An electronic device characterized by comprising the display device according to any one of claims 1 to 8.