CN112882288A

CN112882288A - Display device

Info

Publication number: CN112882288A
Application number: CN202110269037.4A
Authority: CN
Inventors: 蔡俊杰
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2021-03-12
Filing date: 2021-03-12
Publication date: 2021-06-01
Anticipated expiration: 2041-03-12
Also published as: CN112882288B

Abstract

The invention discloses a display device, which belongs to the technical field of display and comprises a display panel, a backlight module and an optical assembly; the backlight module comprises a back plate, a first reflection film and a light guide plate, wherein the first reflection film is positioned between the back plate and the light guide plate, the back plate is provided with a first through hole, the surface of the light guide plate close to the first reflection film is provided with a groove, the groove is sunken towards one side far away from the first reflection film, and the orthographic projection of the groove on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device; the optical assembly comprises a light sensing element, the light sensing element is positioned on one side of the backlight module, which is far away from the display panel, and the orthographic projection of the light sensing element on the display panel is at least partially overlapped with the orthographic projection of the first through hole on the display panel. According to the invention, the groove is arranged on one side of the light guide plate, which is far away from the first reflection film, so that the reliability of the optical performance of the optical component in the scheme of the optical component under the screen can be improved.

Description

Display device

Technical Field

The invention relates to the field of display, in particular to a display device.

Background

With the development of electronic technology, the display screen of the electronic device gradually develops to a full screen. At present, the electronic equipment also has an optical detection function, and the electronic equipment reserves enough space in a frame area of the equipment for placing an optical component, so that the compression of the frame area is limited, and the screen occupation ratio is difficult to further improve. In order to achieve the effect of a full screen or a nearly full screen, and enable the electronic equipment to have a high screen ratio, the scheme of the optical assembly under the screen is developed. The optical assembly is arranged below the display area, so that the space reserved for placing the optical assembly in the frame area is saved, the size of the frame area is reduced, and the screen occupation ratio is improved.

In the existing scheme of the optical assembly under the screen, detection light needs to penetrate through a film layer of a display area and then is received by the optical assembly, so that the function of the optical assembly is realized. However, the reliability of the optical performance of this approach is still to be improved.

Disclosure of Invention

In view of the above, the present invention provides a display device, which can improve the reliability of the optical performance of an optical assembly in an optical assembly under a screen.

The invention discloses a display device, comprising:

a display panel;

the backlight module is positioned on one side of the display panel, which is far away from the light-emitting surface of the display device; the backlight module comprises a back plate, a first reflecting film and a light guide plate, wherein the first reflecting film is positioned between the back plate and the light guide plate; the backboard is provided with a first through hole, and the first through hole penetrates through the backboard in the direction intersecting the plane where the backboard is located; the surface of the light guide plate close to the first reflection film is provided with a groove, the groove is sunken towards one side far away from the first reflection film, and the orthographic projection of the groove on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device;

the optical assembly comprises a light sensing element, the light sensing element is positioned on one side of the backlight module, which is far away from the display panel, and the orthographic projection of the light sensing element on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device.

Compared with the prior art, the display device provided by the invention at least realizes the following beneficial effects:

according to the display device provided by the embodiment of the invention, the first through hole is formed in the back plate, and the first through hole penetrates through the back plate in the direction intersecting the plane where the back plate is located; the light sensing element is positioned on one side of the backlight module, which is far away from the display panel, the orthographic projection of the light sensing element on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device, and the detection light can be received by the light sensing element after passing through the first through hole for optical identification, so that the function of the optical assembly is realized. In addition, the surface of the light guide plate close to the first reflection film is provided with a groove, the groove is sunken towards one side far away from the first reflection film, the orthographic projection of the groove on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device, and the groove is sunken towards one side far away from the first reflection film, so that the gap between the first reflection film and the light guide plate is increased, the electrostatic adsorption condition between the first reflection film and the light guide plate can be avoided or weakened, the surface of the first reflection film, which is in contact with the light guide plate, is relatively flat, and a relatively uniform air layer is formed between the first reflection film and the light guide plate, thereby the film interference phenomenon, namely the Newton ring problem is weakened, the influence of the annular stripe form of the Newton ring on optical detection is weakened or. In addition, the detection light is received by the optical assembly after passing through the first through hole, so that the function of the optical assembly is realized, the flatness of the backlight film material at the position of the first through hole is particularly important, and the orthographic projection of the groove on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device, so that the film material corresponding to partial or even all areas of the first through hole is relatively flat, the Newton ring problem is further weakened, and the reliability of the optical performance of the optical assembly in the scheme of the optical assembly under the screen is improved.

Drawings

FIG. 1 is a schematic diagram of a display device according to the prior art;

FIG. 2a is a prior art optical path diagram of a detection light passing through a light guide plate and a first reflective film;

FIG. 2b is a diagram of a Newton ring representation;

FIG. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another structure of a display device according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of another structure of a display device according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of another structure of a display device according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another structure of a display device according to an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of a light guide plate according to an embodiment of the present invention;

FIG. 10 is a schematic top view of a light guide plate according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of another structure of a display device according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of another structure of a display device according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 16 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 17 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 18 is a schematic structural diagram of a display device according to an embodiment of the present invention;

fig. 19 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples.

It should be noted that in the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

Fig. 1 is a schematic structural diagram of a display device in the prior art. As shown in fig. 1, in the scheme of the optical assembly under the panel, taking a liquid crystal display device as an example, the display device 100 'includes a display panel 01', a backlight module 02 ', and an optical assembly 03', the backlight module 02 'is located on a side of the display panel 01' away from a light-emitting surface of the display device 100 ', the optical assembly 03' includes a light-sensing element 031 ', and the light-sensing element 031' is located on a side of the backlight module 02 'away from the display panel 01'. The back frame 021 ' of the backlight module 02 ' is provided with an opening 0211 ' so that the detection light can be received by the light sensing element 031 ' through the opening 0211 ' for function identification. The light sensing element 031' may be an optical fingerprint recognition element, an optical face recognition element, or the like. In the scheme, the optical performance reliability of the optical assembly is poor, and the user requirements are difficult to meet. The inventors have analyzed the above problems. Fig. 2a is a diagram of a light path of detection light passing through a light guide plate and a first reflective film in the prior art, and fig. 2b is a schematic diagram of a newton ring. In the existing optical assembly scheme under the screen, the detection light needs to penetrate through the film layers of the display area, such as the film layers of the display panel 01 'and the backlight module 02', and then is received by the optical assembly, so as to realize the function of the optical assembly. However, the contact surface between the reflective sheet 022 'and the light guide plate 023' in the backlight is not flat due to the following factors: 1) the reflecting sheet used in the backlight module is obtained by cutting a large-size reflecting sheet base material, but the large-size reflecting sheet base material is in a roll shape, so that the cut reflecting sheet also has a curled edge; 2) because of the material characteristics of the reflective sheet 022 'and the light guide plate 023' in the backlight module 02 'and the static electricity existing in the process of manufacturing the backlight module 02', under the action of the static electricity, the reflective sheet 022 'and the light guide plate 023' can be adsorbed; 3) in the backlight module 02 ', the thickness of the reflective sheet 022 ' and the light guide plate 023 ' is thinner, and the thinner reflective sheet 022 ' and the thinner light guide plate 023 ' are slightly deformed. It should be noted that, among the above factors, the electrostatic adsorption has a significant influence on the flatness of the contact surface between the reflective sheet 022 ' and the light guide plate 023 ' in the backlight module 02 '.

Since the surface of the reflective sheet 022 'contacting the light guide plate 023' is uneven, an uneven air layer exists between the reflective sheet 022 'and the light guide plate 023', especially at the position corresponding to the opening 0211 ', if an uneven air layer exists between the reflective sheet 022' and the light guide plate 023 ', when the detection light penetrates through the film layer of the display region and is received by the optical module, the optical path difference exists between the detection light transmitted through the light guide plate 023' and the reflective sheet 022 'due to the air gap between the light guide plate 023' and the reflective sheet 022 ', and then the thin film interference phenomenon occurs, as shown in fig. 2a, the light received by the light sensing element 031' generates annular fringes with alternate light and dark, i.e. newton rings, as shown in fig. 2b, the newton rings include bright rings and dark rings, which affects the reliability of the optical performance of the optical module.

Therefore, in view of the above technical problems, the present application provides a display device for improving reliability of optical performance of an optical module in an optical module solution under a screen. The following detailed description is to be read in connection with the drawings and the detailed description.

Fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 3, a display device includes: a display panel;

Specifically, the present application provides a display device 100 comprising: a display panel 01; the backlight module 02 is located on a side of the display panel 01 away from the light-emitting surface of the display device 100. The lcd panel cannot emit light autonomously, and therefore, a backlight module is required to be disposed in the lcd device to provide light beams for the display panel, and the display panel displays information, such as text or image information, by using the light beams provided by the backlight module through the display panel. The backlight module 02 includes a back plate 021, a first reflective film 022 and a light guide plate 023, wherein the first reflective film 022 is located between the back plate 021 and the light guide plate 023. The backlight module comprises a back frame, the back frame comprises a back plate 021 and a side plate (not marked), a membrane material of the backlight module is positioned in an accommodating space formed by the back frame, the back plate and the side plate in the back frame can be made of the same material, for example, the back plate and the side plate are made of iron materials, the back plate and the side plate are made of steel materials, and the back plate and the side plate can also be made of different materials. According to the different incident positions of the backlight source, the backlight module comprises a side-in type backlight module and a direct type backlight module. The edge-type backlight module is configured to dispose a backlight source, such as an LED light bar (Lightbar), at an edge of the backlight module, wherein light emitted from the LED light bar enters the light guide plate from a light incident surface on one side of the light guide plate, is reflected and diffused, then is emitted from a light emitting surface of the light guide plate, and then passes through the optical film group to form a surface light source for the liquid crystal display panel. The direct type backlight module is to arrange a backlight source, such as an LED (Light Emitting DiOde), below the display panel to directly form a surface Light source for the liquid crystal display panel. It should be noted that the backlight module in this embodiment may be an edge-in type backlight module, a direct type backlight module with a light guide plate, or a hybrid type backlight module of the edge-in type backlight module and the direct type backlight module. First reflectance coating 022 sets up in the one side that the backplate 021 is close to the light guide plate 023, and the light that gets into first reflectance coating 022 from the light guide plate 023 can reflect to light guide plate 023 again through reflector plate 022, can effectively improve the utilization ratio of light, reduces display device's consumption.

The back plate 021 is provided with a first through hole 0211, and the first through hole 0211 penetrates through the back plate 021 in the direction intersecting with the plane of the back plate 021; the optical assembly 03 includes a light sensing element 031, the light sensing element 031 is located on a side of the backlight module 02 away from the display panel 01, and a front projection of the light sensing element 031 on the light-emitting surface of the display device 100 at least partially overlaps with a front projection of the first through hole 0211 on the light-emitting surface of the display device 100. Most of the conventional back plates are made of opaque metal, and the detecting light is difficult to reach the light sensing element 031 through the back plate 021, so in this embodiment, as shown in fig. 3, a first through hole 0211 is disposed at a position of the back plate 021 corresponding to the light sensing element 031, and the first through hole 0211 can allow the detecting light to enter the light sensing element 031 through the first through hole 0211 for optical identification. The surface of the light guide plate 023 near the first reflective film 022 is provided with a groove 0231, the groove 0231 is recessed towards a side far away from the first reflective film 022, and an orthographic projection of the groove 0231 on the light-emitting surface of the display device 100 at least partially overlaps with an orthographic projection of the first through hole 0211 on the light-emitting surface of the display device 100. Like this recess 0231 is through sunken to the one side of keeping away from first reflective coating 022, the clearance between first reflective coating 022 and light guide plate 023 has been increased in other words, can avoid or weaken the electrostatic adsorption condition between first reflective coating 022 and the light guide plate 023, make the surface that first reflective coating 022 and light guide plate 023 contacted relatively level and smooth, form relatively even air bed between the two, thereby weaken the film interference phenomenon, newton's ring problem promptly, and then weaken or avoid newton's ring's annular fringe form to optical detection's influence, in the improvement screen optical component scheme, optical component optical performance's reliability. In addition, since the detection light is received by the optical assembly after passing through the first through hole 0211, thereby realizing the function of the optical assembly, the flatness of the backlight film at the position of the first through hole 0211 is particularly important, and by at least partially overlapping the orthographic projection of the groove 0231 on the light-emitting surface of the display device 100 and the orthographic projection of the first through hole 0211 on the light-emitting surface of the display device 100, the film corresponding to part of or even all areas of the first through hole 0211 is relatively flat, thereby further reducing the problem of newton's rings, and improving the reliability of the optical performance of the optical assembly in the scheme of the optical assembly under the screen.

It should be noted that, in this embodiment, by at least partially overlapping the orthographic projection of the groove on the light-emitting surface of the display device with the orthographic projection of the first through hole on the light-emitting surface of the display device, a partial area or even all areas of the first through hole correspond to the film material, so that accuracy and reliability of fingerprint identification are improved, the orthographic projection of the light sensing element on the light-emitting surface of the display device and the orthographic projection of the groove on the light-emitting surface of the display device may not overlap or may at least partially overlap, and the arrangement may be performed according to actual requirements, as long as the newton ring problem can be improved. The number of the grooves can be one or more, or a plurality of small grooves, the small grooves are connected together, or a gap is formed between the small grooves, or one or more large grooves and a plurality of small grooves are formed, the small grooves are positioned in the large grooves, or the small grooves and the large grooves are arranged outside, as long as the gap between the first reflection film and the light guide plate can be increased. The first through hole penetrates through the backboard in the direction intersecting with the plane where the backboard is located, the direction of a certain included angle with the plane where the backboard is located is indicated, for example, the included angle can be an acute angle, an obtuse angle or a right angle, namely, the first through hole penetrates through the backboard and can be obliquely or vertically penetrated through the certain included angle with the plane where the backboard is located, as long as the first through hole penetrates through the backboard and the detection light can be received by the light sensing element to be optically recognized after penetrating through the first through hole. In addition, in this embodiment, only a partial schematic structural diagram of the display device is schematically shown, and in specific implementation, the structure of the display device is not limited thereto, for example, the backlight module may further include a diffusion film, a brightness enhancement film, and other film layers, which can be understood with reference to the structure of the display device in the related art, and the description of this embodiment is omitted.

Optionally, the light-sensing element is a fingerprint identification element.

Specifically, as shown in fig. 3, the light sensing element 031 is a fingerprint identification element. The different light sensing elements are different in the characteristics of the received light, and are sensed and identified according to different measurement standards, such as the intensity of the light, the wavelength of the light, the form of the object to be identified and the like. The inventor researches and discovers that the phenomenon of Newton rings can be particularly obvious to interfere with fingerprint identification detection, because in the fingerprint identification detection, the fingerprint identification element receives light reflected by valleys and ridges of a finger to generate corresponding electric signals, and then the electric signals are detected. The light quantity reflected by the ridges received by the fingerprint identification element is larger than that reflected by the valleys, so that the positions of the valleys and the ridges of the fingerprint are judged, and annular stripes with alternate light and shade are formed. Due to the existence of the Newton ring phenomenon, the Newton ring is also an annular stripe of a bright ring and a dark ring, and the shape of the annular stripe of the Newton ring is similar to that of a fingerprint, so that the accuracy of fingerprint ridge and fingerprint valley identification by a fingerprint identification element is interfered, and the reliability of fingerprint identification is further influenced.

In the display device provided by the embodiment of the invention, the light sensing element is a fingerprint identification element, and the groove 0231 is recessed towards one side far away from the first reflective film 022, which is equivalent to increase the gap between the first reflective film 022 and the light guide plate 023, so that the electrostatic adsorption condition between the first reflective film 022 and the light guide plate 023 can be avoided or weakened, the surface of the first reflective film 022 in contact with the light guide plate 023 is relatively flat, and a relatively uniform air layer is formed between the first reflective film 022 and the light guide plate 023, thereby weakening the film interference phenomenon, namely the problem of newton rings, further weakening or avoiding the influence of the annular fringe form of the newton rings on the fingerprint identification form, and improving the accuracy and reliability of fingerprint identification.

Alternatively, the light sensing element in the embodiment of the present invention is not limited to the optical fingerprint recognition element, and may be an optical face recognition element, or other optical elements that perform recognition by detecting the form of light, as long as the newton ring phenomenon has a large interference effect on the information to be recognized.

Optionally, as shown in fig. 4, an orthographic projection of the groove on the light emitting surface of the display device at least covers an orthographic projection of the first through hole on the light emitting surface of the display device, which is another structural schematic diagram of the display device provided in the embodiment of the present invention.

Specifically, the orthographic projection L1 of the groove 0231 on the light-emitting surface of the display device 100 at least covers the orthographic projection L2 of the first through hole 0211 on the light-emitting surface of the display device 100. Since the detection light enters the light sensing element 031 through the first through hole 0211 for optical identification, the orthographic projection of the groove 0231 on the light-emitting surface of the display device 100 at least covers the orthographic projection of the first through hole 0211 on the light-emitting surface of the display device 100, that is, in the range of the first through hole 0211, the gap between the first reflective film 022 and the light guide plate 023 is increased, the electrostatic adsorption between the first reflective film 022 and the light guide plate 023 is avoided or weakened, so that the surface, in contact with the first reflective film 022 and the light guide plate 023, within the range of the first through hole 0211 is relatively flat, and a relatively uniform air layer is formed between the first reflective film 022 and the light guide plate 023, thereby further improving the problem of newton rings, and improving the reliability of optical performance of the optical assembly in the scheme of.

It should be noted that, in an actual process engineering, an orthogonal projection of the groove on the light-emitting surface of the display device at least covers an orthogonal projection of the first through hole on the light-emitting surface of the display device, where at least the covering may be just covering or the size of the groove may be larger.

Optionally, fig. 5 is a schematic structural diagram of a display device provided in an embodiment of the present invention, as shown in fig. 5, along a direction perpendicular to the back plate, a depth of the groove is H, and a thickness of the light guide plate is H, where H is greater than 0 and less than or equal to 1/2H.

Specifically, along a direction perpendicular to the back plate 021, the depth of the groove 0231 is H, the thickness of the light guide plate 023 is H, wherein H is more than 0 and less than or equal to 1/2H. The depth of the groove refers to that the groove 0231 is recessed toward a side away from the first reflective film 022 along a direction perpendicular to the back plate 021, and the depth of the groove represents the size of the recess.

In the backlight module 02, the light guide plate 023 can convert light emitted from the backlight light source into a surface light source or into a more uniform surface light source to be provided to the display panel 01 for displaying information. When H > 1/2H, the thickness of the light guide plate 023 is smaller than that of the light guide plate 023 where no grooves are formed, which affects the propagation path of the light of the backlight light source in the light guide plate 023, so that the display effect of the display panel is affected by different light intensities in different areas of the light guide plate 023. For the side-in type backlight module 02, if the depth H of the groove 0231 is greater than 1/2H, a large part of the initial light emitted from the backlight light source cannot be normally transmitted through the area of the light guide plate not provided with the groove 0231, so that the light entering the area of the light guide plate 023 away from the backlight light source is less, and the light intensity of different areas of the light guide plate is different, thereby affecting the display. For the direct type backlight module 02, the problems and reasons are similar, and are not described herein again. In addition, if H is greater than 1/2H, the thickness of the light guide plate 023 corresponding to the groove 0231 is small, and in the subsequent process, when the light guide plate is attached or assembled with other optical films, and in reliability experiments, the light guide plate is easily damaged due to insufficient structural strength, which affects the yield of the backlight module. In this embodiment, after the factors of the light efficiency and the structural strength of the light guide plate are considered comprehensively, the depth of the groove 0231 is H, and H is more than 0 and less than or equal to 1/2H, so that the light intensity difference of different areas of the backlight module is smaller, and the light guide plate has better structural strength.

It should be noted that, the depth of the groove is used to represent the degree of the recess of the groove to the side far away from the first reflective film, and this quantified index can make the detection of the operability and the subsequent product yield of the light guide plate in the design process and the subsequent process simpler.

Optionally, H is greater than 0 and less than or equal to 1/5H, so that the light intensity difference of different areas of the backlight module is small, and the light guide plate has good structural strength.

Optionally, in a direction perpendicular to the back plate 021, the depth of the groove 0231 is H, and the thickness of the light guide plate 023 is H, wherein H is greater than 0 and less than or equal to 1/10H.

The display device provided by the embodiment of the invention, after comprehensively considering the light efficiency and the structural strength of the light guide plate, the depth of the groove 0231 is H, H is more than 0 and less than or equal to 1/10H, the depth of the groove 0231 of the light guide plate 023 in such a range is found through optical simulation, so that the light intensity of different areas of the backlight module 02 is more close to the light intensity of different areas of the backlight module 02 without the groove in the light guide plate 023, namely H is more than 0 and less than or equal to 1/10H, the groove design of the light guide plate 023 in such a depth can hardly affect the light efficiency of the light guide plate, and meanwhile, the structural strength of the light guide plate can be ensured as much as possible.

Optionally, fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 6, the optical assembly further includes a functional light source (not shown in the figure) that provides a detection light for the light sensing element; the light guide plate comprises a first sub-area and a second sub-area, the groove is located in the second sub-area, the penetration rate of detection light of the second sub-area is larger than that of the first sub-area, and the plane where the surface of the first sub-area close to the first reflection film is located is a first plane.

Specifically, the optical assembly 03 further includes a functional light source (not shown in the figure), which provides detection light for the light sensing element 031, and the detection light reaches the object to be detected through the film layer of the display module 100, and reaches the light sensing element 031 through the film layer of the display module 100 after being reflected by the object to be detected, so as to realize optical detection. Use fingerprint identification to detect as an example, light sense original 031 is the fingerprint identification component, and the functional light source provides detection light, for example can be the infrared light, and detection light arrives the finger through the rete of display module 100, by the finger reflection back, and detection light passes through display panel 01 and backlight unit 02, then receives by fingerprint identification component 031 through first through-hole 0211 and carries out optical identification to realize fingerprint identification. The light guide plate 023 includes a first sub-area a1 and a second sub-area a2, the groove 0231 is located in the second sub-area a2, the transmittance of the detection light of the second sub-area a2 is greater than the transmittance of the detection light of the first sub-area a2, and the orthographic projection of the groove 0231 on the light-emitting surface of the display device 100 at least partially overlaps with the orthographic projection of the first through hole 0211 on the light-emitting surface of the display device 100, so that the through hole 0211 corresponds to at least a partial area of the groove 0231, and the transmittance of the detection light of the second sub-area a2 where the groove 0231 is located is greater than the transmittance of the detection light of the first sub-area a1, so that more detection light reaches the light sensing element 031 through the first through hole 0211 for optical sensing, which can improve the accuracy and reliability of optical sensing on the basis of solving the newton ring.

The plane where the surface of the first sub-area a1 close to the first reflective film 022 is a first plane 0232, and it should be noted that, for better light transmission of the backlight source, the light guide plate 023 includes a main body portion and a dot structure (not shown in the figure) disposed on the surface of the main body portion close to the first reflective film 022, and the first plane 0232 refers to the plane where the surface of the main body portion of the light guide plate 023 close to the first reflective film 022 is located.

Optionally, fig. 7 is a schematic structural diagram of a display device provided in the embodiment of the present invention. As shown in fig. 7, the backlight module further includes a backlight source disposed on the side surface of the light guide plate, the groove includes a first sub-surface close to the backlight source, an included angle between the first sub-surface and the first plane is a first included angle in a clockwise direction, and θ satisfies 0 ° < θ ≦ 90 °; or the included angle between the tangent line of any point in the first sub-surface and the first plane is a first included angle, and the first included angle theta satisfies the condition that theta is more than 0 degree and less than or equal to 90 degrees.

Specifically, the backlight module 02 further includes a backlight source 024, the backlight source 024 is disposed on a side surface of the light guide plate 023, that is, the backlight module 02 in this embodiment is a side-in type backlight module, light emitted from the backlight source 024 enters the light guide plate 023 from the side surface of the light guide plate 023, is reflected and diffused, and then is emitted from a light emitting surface of the light guide plate, and then passes through the optical film group to form a surface light source for the liquid crystal display panel. The groove 0231 comprises a first sub-surface 0233 close to the backlight light source 024, an included angle between the first sub-surface 0233 and a first plane 0232 is a first included angle along the clockwise direction, and the first included angle theta is larger than 0 degree and smaller than or equal to 90 degrees; or the included angle between the tangent of any point in the first sub-surface 0233 and the first plane 0232 is a first included angle, and the first included angle theta satisfies the condition that theta is more than 0 degree and less than or equal to 90 degrees. Note that, in order to better transmit the light of the backlight source 024, the light guide plate 023 includes a main body portion and a dot structure (not shown) disposed on a surface of the main body portion close to the first reflective film 022, where the first sub-surface 0233 refers to a plane where the surface of the main body portion of the groove 0231 on a side close to the backlight source 024 and close to the first reflective film 022 is located, that is, a boundary surface of the groove 0231 close to the main body portion of the backlight source 024.

It should be noted that the first sub-surface 0233 may be a plane or a curved surface, when the first sub-surface 0233 is a plane, an included angle between the first sub-surface 0233 and the first plane 0232 is a first included angle in the clockwise direction, and the first included angle θ satisfies 0 ° < θ ≦ 90 °; when the first sub-surface 0233 is a curved surface, an included angle between a tangent of any point in the first sub-surface 0233 and the first plane 0232 is a first included angle, and the first included angle theta satisfies 0 degrees and theta is more than or equal to 90 degrees. So set up, recess 0231 is sunken to the one side of keeping away from first reflective coating 022, the clearance between light guide plate 023 and the first reflective coating 022 has been increased in other words, can avoid or weaken the static adsorption condition between light guide plate 023 and the first reflective coating 022, make the surface that first reflective coating 022 and light guide plate 023 contacted relatively level and smooth, form relatively even air bed between the two, thereby weaken the film interference phenomenon, newton's ring problem promptly, and then weaken or avoid newton's ring stripe form to optical detection's influence, in the improvement screen optical component scheme down, optical component optical performance's reliability. In addition, the detection light is received by the optical assembly after passing through the first through hole, so that the function of the optical assembly is realized, the flatness of the backlight film material at the position of the first through hole is particularly important, and the orthographic projection of the groove on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device, so that the film material corresponding to partial or even all areas of the first through hole is relatively flat, the Newton ring problem is further weakened, and the reliability of the optical performance of the optical assembly in the scheme of the optical assembly under the screen is improved. In addition, because of the characteristics of the light guide plate, theta > 90 degrees can make the light guide plate difficult to separate from the mold after being manufactured, and the difficulty of the process manufacturing is increased, so the factors of the effect of solving the problem of Newton's rings, the light efficiency, the structural strength, the difficulty of separating from the mold and the like are comprehensively considered, the angle range of theta is set to be more than 0 degree and less than or equal to 90 degrees, the angle range is also convenient to manufacture, the process is simplified, and the smooth transition of the groove 0231 and the first plane 0232 can be realized.

Optionally, in the clockwise direction, an included angle between the first sub-surface 0233 and the first plane 0232 is a first included angle θ, and θ is greater than 0 ° and less than or equal to 60 °; or the tangent line of any point in first sub-surface 0233 and the contained angle between first plane 0232 are first contained angle, and first contained angle theta satisfies 0 degrees and is less than or equal to 60 degrees, so set up, can be when solving the newton's ring problem, it is littleer to light efficiency, structural strength influence, and easily with the mould separation after the light guide plate preparation, the technology process is simpler, the more gentle transition between recess 0231 and the first plane 0232.

When the backlight module is a direct type backlight module, the groove comprises a first sub-surface close to the backlight source, an included angle between the first sub-surface and the first plane is a first included angle in a clockwise direction, and the first included angle theta is larger than 0 degree and smaller than or equal to 90 degrees; or the included angle between the tangent line of any point in the first sub-surface and the first plane is a first included angle, and the first included angle theta satisfies the condition that theta is more than 0 degree and less than or equal to 90 degrees. So set up, can be when solving the Newton's ring problem, it is littleer to light efficiency, structural strength influence, and the technology processing procedure is simpler, the mild transition between recess and the first plane. Optionally, the angle theta is larger than 0 degree and smaller than or equal to 60 degrees, the Newton's ring problem can be solved, the influence on the lighting effect and the structural strength is smaller, the process is simpler, and the groove and the first plane are in more gradual transition.

Optionally, fig. 8 is a schematic structural diagram of a display device provided in the embodiment of the present invention. As shown in fig. 8, the backlight module further includes a backlight source disposed on the side surface of the light guide plate, the groove includes a second sub-surface far away from the backlight source, an included angle between the second sub-surface and the first plane is a second included angle in the counterclockwise direction, and the second included angle phi satisfies a range from 0 degrees to phi less than or equal to 90 degrees; or the included angle between the tangent of any point in the second sub-surface and the first plane is a second included angle, and the first included angle theta satisfies the condition that phi is more than 0 degree and less than or equal to 90 degrees.

Specifically, the backlight module 02 further includes a backlight source 024, the backlight source 024 is disposed on a side surface of the light guide plate 023, that is, the backlight module in this embodiment is a side-in type backlight module, light emitted from the backlight source 024 enters the light guide plate 023 from the side surface of the light guide plate 023, is reflected and diffused, and then is emitted from a light emitting surface of the light guide plate, and then passes through the optical film group to form a surface light source for the liquid crystal display panel. The groove 0231 comprises a second sub-surface 0234 far away from the backlight light source 024, an included angle between the second sub-surface 0234 and the first plane 0232 is a second included angle along the anticlockwise direction, and the second included angle phi is more than 0 degree and less than or equal to 90 degrees; or the included angle between the tangent of any point in the second sub-surface 0234 and the first plane 0232 is a second included angle, and the second included angle theta satisfies the condition that phi is more than 0 degree and less than or equal to 90 degrees. Note that, in order to make the light of the backlight source 024 better spread, the light guide plate 023 includes a main body portion and a dot structure (not shown) disposed on a surface of the main body portion close to the first reflective film 022, where the second sub-surface 0234 refers to a plane where a surface of the main body portion on a side of the groove 0231 away from the backlight source 024 and close to the first reflective film 022 is located, that is, a boundary surface of the groove 0231 away from the main body portion of the backlight source 024.

It should be noted that the second sub-surface 0234 can be a plane or a curved surface, when the second sub-surface 0234 is a plane, an included angle between the second sub-surface 0234 and the first plane 0232 is a second included angle in the counterclockwise direction, and the second included angle phi satisfies a condition that phi is greater than 0 degree and is less than or equal to 90 degrees; when the second sub-surface 0234 is a curved surface, an included angle between a tangent of any point in the second sub-surface 0234 and the first plane 0232 is a second included angle, and the second included angle phi satisfies 0 degrees and phi is more than or equal to 90 degrees. So set up, the recess is sunken to one side of keeping away from first reflectance coating, the clearance between light guide plate and the first reflectance coating has been increased in other words, can avoid or weaken the static adsorption condition between light guide plate and the first reflectance coating, make the surface that first reflectance coating and light guide plate contacted relatively level and smooth, form relatively even air bed between the two, thereby weaken the film and interfere the phenomenon, newton ring problem promptly, and then weaken or avoid newton ring's annular stripe form to optical detection's influence, in the improvement screen lower optical assembly scheme, optical assembly optical property's reliability. In addition, the detection light is received by the optical assembly after passing through the first through hole, so that the function of the optical assembly is realized, the flatness of the backlight film material at the position of the first through hole is particularly important, and the orthographic projection of the groove on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device, so that the film material corresponding to partial or even all areas of the first through hole is relatively flat, the problem of Newton rings is further weakened, and the accuracy and the reliability of fingerprint identification are improved. In addition, due to the characteristics of the light guide plate, phi is larger than 90 degrees, so that the light guide plate is difficult to separate from the mold after being manufactured, and the difficulty of process manufacturing is increased, so that the factors of the effect of solving the Newton ring problem, the lighting effect, the structural strength, the difficulty of separation from the mold and the like are comprehensively considered, the angle range of phi is set to be larger than 0 degrees and smaller than or equal to 90 degrees, the angle range is convenient to manufacture, the process is simplified, and the smooth transition of the groove 0231 and the first plane 0232 can be realized.

Optionally, in the counterclockwise direction, an included angle between the second sub-surface 0234 and the first plane 0232 is a second included angle, and the second included angle Φ satisfies a range from 0 ° < Φ ≦ 60 °; or the included angle between the tangent of any point in the second sub-surface 0234 and the first plane 0232 is a second included angle, and the first included angle theta satisfies the condition that phi is more than 0 degree and less than or equal to 60 degrees.

So set up, can be when solving the newton ring problem, it is littleer to light efficiency, structural strength influence, and easily with the mould separation after the light guide plate preparation, the technology process is simpler, the more gentle transition between recess 0231 and the first plane 0232.

When the backlight module is a direct type backlight module, the groove comprises a second sub-surface close to the backlight source, an included angle between the second sub-surface and the first plane is a second included angle in the anticlockwise direction, and the second included angle phi is larger than 0 degree and smaller than or equal to 90 degrees; or the included angle between the tangent of any point in the second sub-surface and the first plane is a second included angle, and the first included angle theta satisfies the condition that phi is more than 0 degree and less than or equal to 90 degrees. So set up, can be when solving the Newton's ring problem, it is littleer to light efficiency, structural strength influence, and easily with the mould separation after the light guide plate preparation, the technology processing procedure is simpler, the mild transition between recess and the first plane. Optionally, phi is more than 0 degree and less than or equal to 60 degrees, the Newton's ring problem can be solved, meanwhile, the influence on the lighting effect and the structural strength is smaller, the light guide plate is easy to separate from a mold after being manufactured, the process is simpler, and the groove and the first plane are in more gradual transition.

Optionally, when the backlight module is a direct type backlight module, the groove includes a first sub-surface close to the backlight source, an included angle between the first sub-surface and the first plane is a first included angle in a clockwise direction, and the first included angle θ satisfies a condition that θ is greater than 0 degree and is less than or equal to 90 degrees; or an included angle between a tangent line of any point in the first sub-surface and the first plane is a first included angle theta, and the first included angle theta is more than 0 degree and less than or equal to 90 degrees; the groove also comprises a second sub-surface far away from the backlight source, and an included angle between the second sub-surface and the first plane is a second included angle along the anticlockwise direction, wherein the second included angle phi meets the condition that phi is more than 0 degree and less than or equal to 90 degrees; or the included angle between the tangent of any point in the second sub-surface and the first plane is a second included angle, and the first included angle theta satisfies the condition that phi is more than 0 degree and less than or equal to 90 degrees. So set up, can be when solving the newton ring problem, it is littleer to light efficiency, structural strength influence, and the technology process is simpler, the mild transition between recess 0231 and the first plane 0232. Alternatively, 0 ° < θ ≦ 60 °, and 0 ° < φ ≦ 60 °, thereby providing a more gradual transition between groove 0231 and first plane 0232.

Alternatively, fig. 9 is a schematic cross-sectional structure diagram of the light guide plate provided in the embodiment of the present invention, and fig. 10 is a schematic top view of the light guide plate provided in the embodiment of the present invention. As shown in fig. 9, the shape of the groove 0231 may be various, such as trapezoid, polygon, irregular shape, curved shape as shown in fig. 7, or a combination of straight and curved shapes, according to the shape and size of the light sensing element, which is not limited in this respect, but can be flexibly selected according to the specific design requirement in practice, as long as the matching with the light sensing element can be realized and the newton ring problem can be improved. As shown in fig. 10, the orthographic projection of the groove 0231 on the light-emitting surface of the display device may be a circle, an ellipse, a polygon, or an irregular figure, which is not limited in this invention, and in practice, the groove 0231 may be flexibly selected according to specific design requirements, as long as the groove 0231 can be matched with the light sensing element and improve the newton's ring problem. In addition, the shape of the groove can be flexibly arranged according to actual needs, so that the groove can be better matched with a peripheral structure, is suitable for various product designs, and has certain effects on attractiveness and weakening of the frame.

Alternatively, fig. 11 is a schematic structural diagram of a display device provided in an embodiment of the present invention, and fig. 12 is a schematic structural diagram of a display device provided in an embodiment of the present invention. As shown in fig. 11-12, a plurality of dot units are disposed on a side of the light guide plate away from the light exit surface of the display device 100, and in a unit area, the sum of the coverage areas of the dot units corresponding to the second sub-area is smaller than the sum of the coverage areas of the dot units corresponding to the first sub-area.

Specifically, as shown in fig. 11-12, a plurality of dot units 0235 are disposed on a side of the light guide plate 023 away from the light-emitting surface of the display device 100. The dot unit 0235 is configured to reflect light incident on the light exit surface of the light guide plate 023 away from the display device 100, so as to change an original propagation path of the light, and thus the reflected light propagates toward the light exit surface at a plurality of different reflection angles. The energy distribution state of the light guide plate is adjusted by the diffuse reflection effect of the dot unit 0235 on the light to homogenize the light. In a unit area, the sum of the coverage areas of the dot elements 0235 corresponding to the second subregion a2 is smaller than the sum of the coverage areas of the dot elements 0235 corresponding to the first subregion a1, that is, in a unit area, the sum of the coverage areas of the dot elements 0235 corresponding to the second subregion a2 is smaller than the sum of the coverage areas of the dot elements 0235 corresponding to the first subregion a 1.

The functional light source in the optical assembly provides the detecting light, which reaches the light sensing element 031 through at least a partial region of the second sub-region a2 and the first through hole 031, and the transmittance of the detecting light in the light path process needs to be increased in order to ensure the accuracy and reliability of the optical identification of the light sensing element 031. How to increase the transmittance of the light sensing element in the process of corresponding to the light path under the condition of less structural modification is achieved, the inventor deeply analyzes the problem and finds that the energy distribution state of the light guide plate is adjusted by the diffuse reflection effect of the dot unit 0235 on the light to homogenize the light, however, for the light to be detected, the light to be detected reaches the dot unit 0235 and then is scattered, the propagation path of the light is changed, so that the light to be detected entering the light sensing element 031 is reduced, and the accuracy of optical detection is affected; in addition, the scattered light enters the backlight film layer or the display panel and even the object to be detected, which can interfere with the display or other detection processes and affect the normal operation of other devices. Therefore, in the display device provided in the embodiment of the present invention, by adjusting the dot units of the first sub-area a1 and the second sub-area a2, the sum of the coverage areas of the dot units 0235 corresponding to the second sub-area a2 is smaller than the sum of the coverage areas of the dot structures 0235 corresponding to the first sub-area a1 in a unit area, so that the dot units 0235 of the second sub-area a2 can not only satisfy the function of light uniformization, but also reduce the scattering of the dot structures 0235 on the detection light, so that more effective detection light enters the light sensing element 031, and further, the display effect, the accuracy of fingerprint detection, and the effect of reducing the interference on other devices as much as possible are both achieved. Meanwhile, the scheme is simple, the process is not increased, and the effect is obvious.

Alternatively, with continued reference to fig. 11-12, the sum of the coverage areas of the dot elements 0235 corresponding to the second sub-region a2 is less than the sum of the coverage areas of the dot structures 0235 corresponding to the first sub-region a1 per unit area, including multiple cases: in the first case, the coverage area of each dot element 0235 of the first sub-area a1 and the second sub-area a2 is equal, but the density of the dot elements 0235 corresponding to the second sub-area a2 is less than the density of the dot elements 0235 corresponding to the first sub-area a1, as shown in fig. 11; in the second case, the density of the dot elements 0235 of the first sub-area a1 and the second sub-area a2 is equal, but the coverage area of the dot elements 0235 corresponding to the second sub-area a2 is smaller than the coverage area of the dot elements 0235 corresponding to the first sub-area a 1; in the third case, the density of the dot elements 0235 corresponding to the second sub-area a2 is less than the density of the dot elements 0235 corresponding to the first sub-area a1, and the coverage area of the dot elements 0235 corresponding to the second sub-area a2 is less than the coverage area of the dot elements 0235 corresponding to the first sub-area a1, as shown in fig. 12. In the display device provided by the embodiment of the invention, by adjusting the coverage area and/or density of the dot units of the first sub-area a1 and the second sub-area a2, the sum of the coverage areas of the dot units 0235 corresponding to the second sub-area a2 is smaller than the sum of the coverage areas of the dot structures 0235 corresponding to the first sub-area a1 in a unit area, so that the dot units 0235 of the second sub-area a2 can not only meet the function of light uniformization, but also reduce the scattering of the dot structures 0235 on the detection light, so that more effective detection light enters the light sensing element 031, and further the effects of considering the display effect, the accuracy of fingerprint detection and reducing the interference on other devices as much as possible are achieved. Meanwhile, the scheme is simple, the process is not increased, the effect is obvious, and the flexible setting can be realized according to the actual requirement.

Optionally, the dot unit 0235 may be a convex dot structure, a concave dot structure, a convex dot structure, or a concave dot structure, as long as the dot unit 023 is configured to reflect the light incident on the light exit surface of the light guide plate 023 away from the display device 100, so as to change the original propagation path of the light, and thus the reflected light propagates toward the light exit surface in a plurality of different reflection angles. The action principle is the same as above, and the detailed description is omitted here.

It should be noted that, in the actual process, the dot units are adjusted according to the distance relationship with the backlight source, and the coverage area, density, etc. of the dot units in the first sub-area a1 may not be completely the same. In the lateral backlight module, the coverage area and density of the dot units in the first sub-area a1 are different according to the distance from the backlight source, generally, the dot units are distributed from sparse to dense or from small to large along the direction away from the incident surface, because the light intensity at the end of the light guide plate close to the backlight source is stronger, and the light intensity at the end away from the backlight source is weaker, which makes the light output from the light exit surface of the light guide plate uneven, and the dot units are arranged to make each area of the surface of the light guide plate close to the first reflective film transmit as much incident light to the light exit surface as possible by the reflection of the dot units. The density and size of the dot units in the first sub-area a1 are not limited, and in practice, the dot units can be selected according to specific design requirements, as long as the sum of the coverage areas of the dot units corresponding to the second sub-area a2 is smaller than the sum of the coverage areas of the dot units corresponding to the first sub-area a1 within a unit area.

Optionally, fig. 13 is a schematic structural diagram of a display device provided in the embodiment of the present invention. As shown in fig. 13, the light guide plate 023 further includes a third sub-area, the third sub-area is located between the first sub-area and the second sub-area, in a unit area, the sum of the coverage areas of the dot units corresponding to the third sub-area is greater than the sum of the coverage areas of the dot units corresponding to the second sub-area, and the sum of the coverage areas of the dot units corresponding to the third sub-area is less than the sum of the coverage areas of the dot structures corresponding to the first sub-area.

Specifically, in a unit area, the sum of the coverage areas of the dot elements 0235 corresponding to the third sub-area A3 is greater than the sum of the coverage areas of the dot elements 0235 corresponding to the second sub-area a2, and the sum of the coverage areas of the dot elements 0235 corresponding to the third sub-area A3 is less than the sum of the coverage areas of the dot structures 0235 corresponding to the first sub-area a1, including various situations, the density of the dot elements 0235 can be adjusted while keeping the coverage areas of the dot elements 0235 equal; the coverage area of the halftone dot cells can also be adjusted while keeping the density of the halftone dot cells 0235 the same. In a unit area, the sum of the coverage areas of the halftone dot cells 0235 corresponding to the third sub-area A3 is greater than the sum of the coverage areas of the halftone dot cells 0235 corresponding to the second sub-area a2, and there are 3 setting modes; the sum of the coverage areas of the dot elements 0235 corresponding to the third sub-area A3 is smaller than the sum of the coverage areas of the dot structures 0235 corresponding to the first sub-area a1, and there are 3 setting modes; both conditions satisfied a total of 9 settings. The setting mode can be flexibly selected according to actual requirements, the method is not limited to this, and in practice, the selection can be performed according to specific design requirements as long as the sum of the coverage areas of the dot units corresponding to the second sub-area a2 is smaller than the sum of the coverage areas of the dot units corresponding to the first sub-area a1 within a unit area. Since the dot units of the first sub-area a1, the second sub-area a2 and the third sub-area A3 can be flexibly set, different display and optical detection requirements can be met. In addition, the third sub-region A3 is located between the first sub-region a1 and the second sub-region a2, and plays a transition role, so that the light emitted from the first sub-region a1 and the second sub-region a2 can be uniformly transited, and no obvious boundary feeling can be generated.

Optionally, a third sub-region is arranged in at least a partial region between the first sub-region a1 and the second sub-region a2, the third sub-region may be arranged at a position where the boundary feeling is obvious according to actual requirements, and the third sub-region is not arranged at a position where the boundary feeling is weak, or the third sub-regions may be arranged in both regions between the first sub-region a1 and the second sub-region a2, and may be flexibly arranged according to actual conditions, and the principle is the same, and is not described herein again.

Alternatively, fig. 14 is a schematic structural diagram of a display device provided in the embodiment of the present invention, fig. 15 is a schematic structural diagram of a display device provided in the embodiment of the present invention, and fig. 16 is a schematic structural diagram of a display device provided in the embodiment of the present invention. As shown in fig. 14-16, the display device further includes a middle frame, the backlight module further includes a second reflective film, the middle frame includes a bottom frame, the bottom frame is located on a side of the back plate away from the light guide plate, the light-sensing element is located on a side of the bottom frame away from the back plate, and the second reflective film is located between the light guide plate and the bottom frame;

the bottom frame is provided with a second through hole, the second through hole penetrates through the bottom frame in the direction intersecting the plane of the bottom frame, and the orthographic projection of the second through hole on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device;

the orthographic projection of the second reflecting film on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the groove on the light-emitting surface of the display device, and the reflectivity of the second reflecting film is larger than that of the first reflecting film.

Specifically, the display device 100 further includes a middle frame 04, the backlight module 02 further includes a second reflective film 025, the middle frame 04 includes a bottom frame 041, the bottom frame 041 is located on a side of the back plate 021 far away from the light guide plate 023, the light sensing element 031 is located on a side of the bottom frame 041 far away from the back plate 021, and the second reflective film 025 is located between the light guide plate 023 and the bottom frame 041. The middle frame 04 is a frame of the display module 100 disposed between the backlight module 02 and a rear cover (not shown) and used for carrying various components (e.g., a battery, a main board, etc.) inside. The middle frames can be made of metal or alloy materials, and the number of the middle frames can be one or two, and can be set according to actual requirements. The middle frame 04 includes a bottom frame 041, and the bottom frame 041 is located at a side of the back plate 021 far away from the light guide plate 023.

The bottom frame 041 is provided with a second through hole 0411, in a direction intersecting a plane where the bottom frame 041 is located, the second through hole 0411 penetrates through the bottom frame 041, and an orthographic projection of the second through hole 0411 on the light-emitting surface of the display device 100 is at least partially overlapped with an orthographic projection of the first through hole 0211 on the light-emitting surface of the display device 100. The light sensing element 031 is located on a side of the bottom frame 041 away from the backlight module 02, and most of the conventional bottom frame 041 is made of opaque metal, and the detection light is difficult to reach the light sensing element 031 through the bottom frame 041, so in this embodiment, as shown in fig. 14 to 16, a second through hole 0411 is disposed at a position of the bottom frame 041 corresponding to the light sensing element 031, and the second through hole 0411 enables the detection light to enter the light sensing element 031 through the second through hole 0411 for optical identification. In the direction intersecting the plane of the bottom frame 041, the second through hole 0411 penetrates through the bottom frame 041, where the direction intersecting the plane of the bottom frame is a direction having a certain included angle with the plane of the bottom frame, for example, the direction may be an acute angle, an obtuse angle, or a right angle, that is, the second through hole penetrates through the bottom frame may have a certain included angle with the plane of the bottom frame, that is, the second through hole penetrates through the bottom frame obliquely or vertically, as long as the second through hole penetrates through the bottom frame, and the detection light can be received by the light sensing element after passing through the second through hole for optical recognition.

The orthographic projection of the second reflective film 025 on the light-emitting surface of the display device 100 is at least partially overlapped with the orthographic projection of the groove 0231 on the light-emitting surface of the display device 100, and the reflectivity of the second reflective film 025 is greater than that of the first reflective film 022. The embodiment of the invention provides the second reflective film 025 between the light guide plate 023 and the bottom frame 041. The light emitted from the backlight source enters the light guide plate 023, is reflected and diffused in the light guide plate 023, and then is emitted from the light-emitting surface of the light guide plate 023, and then passes through the optical film set to form a surface light source for the liquid crystal display panel. The light emitted from the light-emitting surface of the light guide plate 023 enters the first reflective film 022 or the second reflective film 025, and is reflected by the first reflective film 022 or the second reflective film 025 to enter the light guide plate 023 for recycling. Because the orthographic projection of the second reflective film 025 on the light-emitting surface of the display device 100 is at least partially overlapped with the orthographic projection of the groove 0231 on the light-emitting surface of the display device 100, the reflectivity of the second reflective film 025 is greater than the reflectivity of the first reflective film 022, that is, at least a partial area of the groove 0231 corresponds to the second reflective film 025, and the second reflective film 025 has higher reflection efficiency for light, the utilization rate of light in at least a partial area of the groove 0231 is higher, so that the brightness at the position corresponding to the groove 0231 is increased, and the accuracy of optical identification of the light sensing element 031 is improved; in addition, can avoid setting up the influence that recess 0231 probably will be to the luminous intensity of the different regions of light guide plate 023 because of light guide plate 023, the luminous intensity of balanced different region light guide plates for the luminous intensity in the different regions of backlight unit is balanced, makes display panel's display effect homogeneous.

The reflectance of the second reflective film is greater than the reflectance of the first reflective film, that is, the second reflective film is a high-reflectance reflective film, and the reflectance can be adjusted according to a manufacturing material, a thickness of the manufacturing material, and the like, and the manufacturing material includes: the thicknesses of the second reflecting film and the first reflecting film are not limited, and the thicknesses of the manufacturing materials can be flexibly selected according to specific design requirements in practice as long as the reflectivity of the second reflecting film is larger than that of the first reflecting film.

Alternatively, with continued reference to fig. 14, as shown in fig. 14, a second reflective film is positioned between the light guide plate and the first reflective film.

Specifically, in fig. 14, the second reflective film 025 is positioned between the light guide plate 023 and the first reflective film 022. The orthographic projection of the second reflective film 025 on the light-emitting surface of the display device 100 is at least partially overlapped with the orthographic projection of the groove 0231 on the light-emitting surface of the display device 100, and the second reflective film 025 is positioned on one side of the first reflective film 022 close to the light guide plate 023, so that light emitted from the opposite surface of the light-emitting surface of the light guide plate 023 enters the first reflective film 022 and the second reflective film 025 and is reflected again to enter the light guide plate 023 for reuse. Because the second reflection film 025 is closer to the light guide plate, the optical path of the light in the area corresponding to the second reflection film 025 is shortened as a whole, namely, the second reflection film 025 can reflect the light back to the light guide plate for reuse in time, so that the light intensity in different areas of the light guide plate is more balanced, and the display effect of the display panel is uniform. In addition, since at least a partial region of the groove 0231 corresponds to the second reflective film 025 and the second reflective film 025 reflects light more efficiently, the utilization rate of light in at least a partial region of the groove 0231 is higher, thereby increasing the brightness of the position corresponding to the groove 0231 and improving the accuracy of the optical recognition of the light sensing element 031.

Optionally, the orthographic projection of the second reflective film 025 on the light-emitting surface of the display device 100 is located in the orthographic projection of the groove 0231 on the light-emitting surface of the display device 100, and the arrangement is such that, in the direction perpendicular to the display device 100, at least a part of the second reflective film 025 is embedded into the groove 0231, so that the thickness of the backlight module 02 can be reduced, thereby reducing the overall thickness of the display device 100, and facilitating the light and thin design of the display device 100.

Alternatively, with continued reference to fig. 15-16, as shown in fig. 15-16, the first reflective membrane 022 includes third through holes 0221, the third through holes 0221 extending through the first reflective membrane 022 in a direction intersecting a plane in which the first reflective membrane 022 is located;

the orthographic projection of the third through hole 0221 on the light-emitting surface of the display device 100, the orthographic projection of the first through hole 0211 on the light-emitting surface of the display device 100 and the orthographic projection of the second through hole 02411 on the light-emitting surface of the display device 100 are overlapped to form an intersection region, so that the detection light reaches the light sensing element 031 through the intersection region;

the second reflective film 025 is located between the back plate 021 and the bottom frame 041, as shown in fig. 15; or the second reflective film 025 is positioned between the back plate 021 and the first reflective film 022 as shown in fig. 16.

In the display device provided by the embodiment of the invention, the first reflective film 022 includes the third through hole 0221, and the back plate 021 is provided with the first through hole 021, so that the light emitted from the opposite surface of the light-emitting surface of the light guide plate 023 passes through the third through hole 221 and the first through hole 0211 to reach the second reflective film 025, and then is reflected by the second reflective film 025 to enter the light guide plate 023 for utilization, thereby the light intensities of different areas of the light guide plate can be more balanced, and the display effect of the display panel is uniform. In addition, due to the existence of the first through hole 0211, the second through hole 0221 and the third through hole 041, when optical identification is performed, the number of the film layers through which detection light penetrates is small, more effective light enters the light sensing element 031 for optical identification, and the accuracy and reliability of optical identification of the light sensing element can be improved. In addition, when the display device 100 is designed and manufactured, a gap is formed between the first reflective film 022 and the back plate 021, and a gap is formed between the back plate 021 and the bottom frame 041, in the scheme, the second reflective film 025 is arranged between the first reflective film 022 and the back plate 021, or the back plate 021 and the bottom frame 041, the second reflective film 025 can be arranged at the original gap position between the film layers, and an extra reserved space does not need to be reserved for arranging the second reflective film 025, so that the influence on the whole thickness of the display device 100 is small or even no influence is caused.

It should be noted that, in the direction intersecting the plane where the first reflective film 022 is located, the third through hole 0221 penetrates through the first reflective film 022, where the third through hole intersects the plane where the first reflective film is located, which means that there is a certain included angle with the plane where the first reflective film is located, for example, the third through hole may be an acute angle, an obtuse angle, or a right angle, that is, the third through hole penetrates through the first reflective film and may have a certain included angle with the plane where the first reflective film is located, that is, the third through hole penetrates through the first reflective film obliquely or perpendicularly, as long as the third through hole penetrates through the first reflective film, and the detection light can be received by the light sensing element after passing through the third through hole for optical identification.

Optionally, the second reflective film is an infrared-transmissive light reflective film.

Specifically, the second reflective film 025 is an infrared-transmissive light reflective film. In the optical recognition process, the detection light is received by the optical component, so that the function of the optical component is realized. For detecting light, it is an important way to use infrared light as the detecting light, for example, in fingerprint identification, infrared light can be used as the detecting light to realize reliability and accuracy of fingerprint identification. In the fingerprint identification process, fingerprint detection light is by the finger reflection back, through display panel 01 and backlight unit 02, then is received by fingerprint identification component 031 to realize fingerprint identification. Because the second reflective film 025 is a transparent infrared reflective film, that is, the infrared light as the detection light can pass through the second reflective film 025 to be received by the light sensing element 031, under the condition that the light intensity of different areas of the light guide plate is more balanced, the light sensing element 031 can be ensured to receive the detection light well, and fingerprint identification is performed.

Alternatively, fig. 17 is a schematic structural diagram of a display device provided in an embodiment of the present invention, and fig. 18 is a schematic structural diagram of a display device provided in an embodiment of the present invention. As shown in fig. 17-18, the optical assembly further includes a functional light source, which provides detection light for the light sensing element;

the display device also comprises a protective cover plate, wherein the protective cover plate is positioned on one side of the display panel, which is far away from the backlight module;

the functional light source is positioned on one side of the protective cover plate close to the backlight module and is positioned at one end of the display panel; or the functional light source is positioned on one side of the backlight module, which is far away from the display panel.

Specifically, in fig. 17, the optical assembly 03 further includes a functional light source 032, where the functional light source 032 provides a detection light for the light-sensing element 031; the display device 100 further comprises a protective cover plate 05, wherein the protective cover plate 05 is positioned on one side of the display panel 01, which is far away from the backlight module 02; the functional light source 032 is located on one side of the protective cover plate 05 close to the backlight module 02 and is located at one end of the display panel 01; in this way, the light 032 emitted by the functional light source passes through the cover plate 05, and can be totally reflected in the cover plate 05 until reaching an optical recognition area, such as a fingerprint recognition area, and then reach a finger after passing through the cover plate 05, and reach the light sensing element 031 through the cover plate 05, the display panel 01, the backlight module 02 and other structures after being reflected by the finger, so as to perform optical recognition, such as fingerprint recognition. In this way, the film layer through which the detection light passes is less, and the influence on the light intensity of the detection light is less, so that more effective detection light can reach the light sensing element 031, and the precision of optical detection is improved; in addition, the functional light source 032 is located below the cover plate, so that the structures of the display panel 01 and the backlight module 02 hardly need to be changed, and the process is simplified.

Specifically, as shown in fig. 18, the optical assembly 03 further includes a functional light source 032, where the functional light source 032 provides a detection light for the light-sensing element 031; the display device 100 further comprises a protective cover plate 05, wherein the protective cover plate 05 is positioned on one side of the display panel 01, which is far away from the backlight module 02; the functional light source 032 is located on a side of the backlight module 02 far away from the display panel 01. In this way, the functional light source is located on the side of the backlight module far away from the display panel, that is, the direct-type functional light source, and light emitted by the functional light source passes through the backlight module 02, the display panel 01 and the protective cover plate 05 to reach the finger, and after being reflected by the finger, the light passes through the protective cover plate 05, the display panel 01 and the backlight module 02 to reach the light sensing element for optical identification. The requirement on the protective cover plate is low, the total reflection condition is not required, and the cost is saved; in addition, the functional light source 032 is far away from one side of the display panel 01 of the backlight module 02, so that the structures of the display panel 01 and the backlight module 02 hardly need to be changed, and the process is simplified; in addition, the functional light source 032 backlight module 02 is far away from one side of the display panel 01, so that the space of the frame is not occupied, and the narrow frame design can be realized. It should be noted that, the number of the functional light sources, for example, 1 or more, can be set according to actual requirements, and the back plate 021 is provided with an opening corresponding to the position of the functional light source 032, and light of the functional light source 032 can be transmitted to the backlight through the opening.

It should be noted that, in the above embodiments, the schematic diagram of the partial film structure of the display device is only schematically drawn, and the specific film structure of the display panel is not shown, in the specific implementation, the film structure of the display device is not limited thereto, and the display panel may also include film layers such as a thin film transistor array film layer and various insulating layers, which can be specifically understood with reference to the film structures of the display device and the display panel in the related art, and is not described herein again.

Fig. 19 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 19, the display device 100 is the display device 100 provided in any of the above embodiments of the present application, and repeated descriptions are omitted. The touch display device 100 provided by the present application may be: any product or component with touch control function and display function, such as mobile phone, tablet computer, display, notebook computer, digital photo frame, navigator, etc.

As can be seen from the above embodiments, the display panel and the display device provided by the present invention at least achieve the following beneficial effects:

according to the display device provided by the embodiment of the invention, the first through hole is formed in the back plate, and the first through hole penetrates through the back plate in the direction intersecting the plane where the back plate is located; the light sensing element is positioned on one side of the backlight module, which is far away from the display panel, the orthographic projection of the light sensing element on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device, and the detection light can be received by the light sensing element after passing through the first through hole for optical identification, so that the function of the optical assembly is realized. In addition, the surface of the light guide plate close to the first reflection film is provided with a groove, the groove is sunken towards one side far away from the first reflection film, the orthographic projection of the groove on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device, and the groove is sunken towards one side far away from the first reflection film, so that the gap between the light guide plate and the first reflection film is increased, the electrostatic adsorption condition between the light guide plate and the first reflection film can be avoided or weakened, the surface of the first reflection film, which is in contact with the light guide plate, is relatively flat, and a relatively uniform air layer is formed between the first reflection film and the light guide plate, thereby the film interference phenomenon, namely the Newton ring problem is weakened, the influence of the annular stripe form of the Newton ring on optical detection is weakened or. In addition, the detection light is received by the optical assembly after passing through the first through hole, so that the function of the optical assembly is realized, the flatness of the backlight film material at the position of the first through hole is particularly important, and the orthographic projection of the groove on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device, so that the film material corresponding to partial or even all areas of the first through hole is relatively flat, the Newton ring problem is further weakened, and the reliability of the optical performance of the optical assembly in the scheme of the optical assembly under the screen is improved.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A display device, comprising:

a display panel;

the backlight module is positioned on one side of the display panel, which is far away from the light-emitting surface of the display device; the backlight module comprises a back plate, a first reflection film and a light guide plate, wherein the first reflection film is positioned between the back plate and the light guide plate; the backboard is provided with a first through hole, and the first through hole penetrates through the backboard in the direction intersecting the plane where the backboard is located; a groove is formed in the surface, close to the first reflection film, of the light guide plate, the groove is sunken towards one side far away from the first reflection film, and the orthographic projection of the groove on the light emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light emitting surface of the display device;

2. The display device as claimed in claim 1, wherein an orthographic projection of the groove on the light exit surface of the display device at least covers an orthographic projection of the first through hole on the light exit surface of the display device.

3. The display device according to claim 1, wherein the groove has a depth H and the light guide plate has a thickness H in a direction perpendicular to the back plate, wherein 0 < H ≦ 1/2H.

4. The display device according to claim 1, wherein the optical assembly further comprises a functional light source for providing detection light to the light-sensing element;

the light guide plate comprises a first sub-area and a second sub-area, the groove is located in the second sub-area, the penetration rate of detection light of the second sub-area is larger than that of the first sub-area, and the plane where the surface of the first sub-area close to the first reflection film is located is a first plane.

5. The display device according to claim 4, wherein the backlight module further comprises a backlight source disposed on a side surface of the light guide plate, the groove comprises a first sub-surface close to the backlight source, an included angle between the first sub-surface and the first plane is a first included angle in a clockwise direction, and the first included angle θ satisfies 0 ° < θ ≦ 90 °; or an included angle between a tangent line of any point in the first sub-surface and the first plane is a first included angle, and the first included angle theta satisfies the condition that theta is greater than 0 degree and less than or equal to 90 degrees.

6. The display device according to claim 4, wherein the backlight module further comprises a backlight source disposed on a side surface of the light guide plate, the groove structure comprises a second sub-surface far away from the backlight source, an included angle between the second sub-surface and the first plane is a second included angle in a counterclockwise direction, and the second included angle Φ satisfies 0 ° < Φ ≦ 90 °; or the included angle between the tangent of any point in the second sub-surface and the first plane is a second included angle, and the second included angle phi meets the condition that phi is more than 0 degree and less than or equal to 90 degrees.

7. The display device according to claim 4, wherein a plurality of dot units are disposed on a side of the light guide plate away from the light exit surface of the display device, and a sum of coverage areas of the dot units corresponding to the second sub-area is smaller than a sum of coverage areas of the dot units corresponding to the first sub-area in a unit area.

8. The display device according to claim 7, wherein a density of the dot units corresponding to the second sub-area is smaller than a density of the dot units corresponding to the first sub-area per unit area, and/or a coverage area of the dot units corresponding to the second sub-area is smaller than a coverage area of the dot units corresponding to the first sub-area per unit area.

9. The display device according to claim 7, wherein the light guide plate further comprises a third sub-area, the third sub-area is located between the first sub-area and the second sub-area, and in a unit area, a sum of coverage areas of the dot units corresponding to the third sub-area is greater than a sum of coverage areas of the dot units corresponding to the second sub-area, and a sum of coverage areas of the dot units corresponding to the third sub-area is smaller than a sum of coverage areas of the dot units corresponding to the first sub-area.

10. The display device according to claim 1, wherein the display device further comprises a middle frame, the backlight module further comprises a second reflective film, the middle frame comprises a bottom frame, the bottom frame is located on a side of the back plate away from the light guide plate, the light sensing element is located on a side of the bottom frame away from the back plate, and the second reflective film is located between the light guide plate and the bottom frame;

the bottom frame is provided with a second through hole, the second through hole penetrates through the bottom frame in the direction intersecting with the plane of the bottom frame, and the orthographic projection of the second through hole on the light-emitting surface of the display device is at least partially overlapped with the orthographic projection of the first through hole on the light-emitting surface of the display device;

11. The display device according to claim 10, wherein the second reflective film is located between the light guide plate and the first reflective film.

12. The display device according to claim 10, wherein the first reflective film includes a third through hole that penetrates the first reflective film in a direction intersecting a plane in which the first reflective film is located;

the orthographic projection of the third through hole on the light-emitting surface of the display device, the orthographic projection of the first through hole on the light-emitting surface of the display device and the orthographic projection of the second through hole on the light-emitting surface of the display device are overlapped to form an intersection area, so that the detection light reaches the light sensing element through the intersection area;

the second reflection film is located between the back plate and the bottom frame, or the second reflection film is located between the first reflection film and the back plate.

13. The display device according to claim 10, wherein the second reflective film is an infrared-transmissive light reflective film.

14. The display device according to claim 1, further comprising:

the optical component also comprises a functional light source, and the functional light source provides detection light for the light sensing element;

the display device further comprises a protective cover plate, and the protective cover plate is positioned on one side of the display panel, which is far away from the backlight module;

the functional light source is positioned on one side of the protective cover plate close to the backlight module and is positioned at one end of the display panel; alternatively, the first and second electrodes may be,

the functional light source is positioned on one side of the backlight module, which is far away from the display panel.

15. The display device as claimed in claim 1, wherein the light-sensing element is a fingerprint recognition element.