Backlight module and display device

Abstract

A backlight module and a display device, the backlight module comprising: a surface light source (000), a first light guide plate (100) and a first light source (200). The first light guide plate (100) is located on the light exiting side of the surface light source (000), and the light emitted by the first light source (200) can be emitted from the backlight module after being reflected by a first mesh point (101) without passing through other film layers, thereby reducing the loss of the light emitted by the first light source (200) during the propagation process, improving the light brightness in the secondary viewing angle area of ​​the backlight module in the sharing mode, and improving the brightness of the display screen in the display device.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] With the development of display technology, display devices need to have different viewing angles in different occasions. For example, when multiple people need to see the display screen of the display device at different angles, the viewing angle range of the display device needs to be larger so that the display device is in a sharing mode; when the content of the display screen needs to be kept confidential and visible only to the user, the viewing angle range of the display device needs to be smaller so that the display device is in an anti-peeping mode.

[0003] In the related art, when the display device is in the sharing mode, when the angle between the viewing direction of the human eye and the normal of the display surface of the display device is small, the brightness of the displayed picture is high, and when the angle between the viewing direction of the human eye and the normal of the display surface of the display device is large, the brightness of the displayed picture is low. In this way, when the display device is in the sharing mode, the display effect of the display device is poor. Summary of the invention

[0004] The embodiment of the present application provides a backlight module and a display device, which can solve the problem that the display device in the prior art has a poor display effect when in a sharing mode. The technical solution is as follows:

[0005] In one aspect, a backlight module is provided, the backlight module comprising:

[0006] Area light source;

[0007] A first light guide plate stacked with the surface light source in the thickness direction, the first light guide plate is located at the light emitting side of the surface light source, and a surface of the first light guide plate close to the surface light source has a plurality of first grid points;

[0008] And, a first light source, the first light source is located on a side surface of the first light guide plate, and the first light source and the orthographic projection of the first light guide plate on the plane where the light emitting surface of the surface light source is located have no overlap.

[0009] Optionally, the first light source is a strip light source;

[0010] The first mesh point is a prism structure, and the length direction of the first mesh point is parallel to the extension direction of the light source bar of the first light source;

[0011] The first grid point is a prism structure, and the first grid point has a first side surface in contact with the first light guide plate, and a second side surface and a third side surface connected to the first side surface, a first angle is formed between the first side surface and the second side surface, a second angle is formed between the first side surface and the third side surface, and a third angle is formed between the second side surface and the third side surface.

[0012] Optionally, a width of the first side surface in a length direction of the first dot ranges from 35 micrometers to 100 micrometers, and a width of the first side surface in a direction perpendicular to the length direction of the first dot ranges from 20 micrometers to 100 micrometers.

[0013] Optionally, the first angle ranges from 20 degrees to 70 degrees, and the second angle is less than or equal to 20 degrees.

[0014] Optionally, there is a chamfer at the third angle, the chamfer is a circular arc, and the radius of the circular arc is less than or equal to 30 microns.

[0015] Optionally, the surface light source is a collimated surface light source.

[0016] Optionally, the collimated surface light source includes an anti-peeping structure and a second light guide plate stacked in a thickness direction;

[0017] The second light guide plate is located on a side of the anti-peeping structure away from the first light guide plate, and a side of the second light guide plate away from the anti-peeping structure has a plurality of second mesh points;

[0018] The collimated surface light source further includes a second light source, which is located on the side of the second light guide plate, and the second light source and the orthographic projection of the second light guide plate on the plane where the light emitting surface of the collimated surface light source is located do not overlap.

[0019] Optionally, the anti-peeping structure includes: a first substrate, and a plurality of strip-shaped first prisms located on the first substrate, wherein the plurality of first prisms are located on a side of the first substrate close to the second light guide plate.

[0020] Optionally, the second light source is a strip light source, and an extension direction of the light source strip of the second light source is the same as an extension direction of the light source strip of the first light source;

[0021] The length direction of the plurality of first prisms is parallel to the extending direction of the light source bar of the second light source.

[0022] Optionally, the first prism is a triangular prism structure, and the first prism has a fourth side surface in contact with the first substrate, and a fifth side surface and a sixth side surface connected to the fourth side surface;

[0023] A fourth angle between the fourth side surface and the fifth side surface is greater than or equal to a fifth angle between the fourth side surface and the sixth side surface, and the fourth side surface of the first prism is closer to the second light source than the fifth side surface.

[0024] Optionally, the fourth angle ranges from 45 degrees to 90 degrees, and the fifth angle ranges from 45 degrees to 70 degrees.

[0025] Optionally, the angle range of the fourth angle is 60 degrees to 72 degrees, and the angle range of the fourth angle is 53 degrees to 57 degrees.

[0026] Optionally, there is a chamfer at the sixth angle between the fifth side surface and the sixth side surface, and the chamfer is a circular arc, and the radius of the circular arc is less than or equal to 30 microns.

[0027] Optionally, the anti-peeping structure further includes: a particle diffusion layer, the particle diffusion layer including: a transparent film layer and a plurality of particles located in the transparent film layer;

[0028] The transparent film layer is the first substrate, or the transparent film layer is a film layer on a side of the first substrate away from the plurality of first prisms.

[0029] Optionally, the concentration of particles in the transparent film layer ranges from 10% to 90%.

[0030] Optionally, the second mesh point is a prism structure, and the length direction of the second mesh point is parallel to the extension direction of the light source bar of the second light source;

[0031] The second mesh point has a seventh side surface contacting the second light guide plate, and an eighth side surface and a ninth side surface connected to the seventh side surface;

[0032] A seventh angle is defined between the seventh side surface and the eighth side surface, an eighth angle is defined between the seventh side surface and the ninth side surface, and a ninth angle is defined between the eighth side surface and the ninth side surface.

[0033] Optionally, a width of the fourth side in a length direction of the second dots is in a range of 35 micrometers to 100 micrometers, and a width of the fourth side in a direction perpendicular to the length of the second dots is in a range of 20 micrometers to 100 micrometers.

[0034] Optionally, the seventh angle is greater than the eighth angle, and the eighth side surface in the second grid point is closer to the second light source than the ninth side surface.

[0035] Optionally, the seventh angle ranges from 10 degrees to 90 degrees, and the eighth angle is less than or equal to 30 degrees.

[0036] Optionally, the seventh angle is between 26 and 30 degrees, and the eighth angle is less than or equal to 5 degrees.

[0037] Optionally, there is a chamfer at a ninth angle between the eighth side surface and the ninth side surface, and the chamfer is a circular arc, and the radius of the circular arc is less than or equal to 30 micrometers.

[0038] Optionally, the radius of the arc is less than or equal to 5 microns.

[0039] Optionally, the first mesh dots and the second mesh dots are the same in shape and size.

[0040] Optionally, the anti-peep structure includes: a grating structure.

[0041] Optionally, the collimated surface light source further includes: a reflective sheet located on a side of the second light guide plate away from the anti-peep structure.

[0042] Optionally, the collimated surface light source also includes: a second substrate located between the second light guide plate and the reflective sheet, and a plurality of strip-shaped second prisms located on the second substrate, the second prisms being located on a side of the second substrate close to the second light guide plate, and the length direction of the plurality of second prisms being perpendicular to an extension direction of the light source bar of the second light source.

[0043] Optionally, a side of the first light guide plate away from the plurality of first dots has a plurality of strip-shaped third prisms, and / or a side of the second light guide plate away from the plurality of second dots has a plurality of strip-shaped fourth prisms, and the length directions of the plurality of third prisms and the length directions of the plurality of fourth prisms are both perpendicular to the extension direction of the light source bar of the second light source.

[0044] Optionally, the backlight module further includes: a frame; the first light guide plate, the second light guide plate, the anti-peep structure, the first light source, and the second light source are all located in the frame.

[0045] Optionally, the frame includes: a back plate, the back plate having a first groove, a second groove and a third groove connected in sequence, an opening surface of the first groove is coplanar with a bottom surface of the second groove, and an opening surface of the second groove is coplanar with a bottom surface of the third groove;

[0046] The reflective sheet is located in the first groove, the second light guide plate and the second light source are both located in the second groove, and the first light guide plate and the first light source are both located in the third groove.

[0047] Optionally, the frame body further includes: a plastic frame connected to the edge of the back panel, the plastic frame having a panel bearing portion, and the panel bearing portion is used to bear the display panel.

[0048] Optionally, the first light source and the second light source are located on the same side of the frame, or the first light source and the second light source are located on two opposite sides of the frame.

[0049] In another aspect, a display device is provided, the display device comprising:

[0050] Display panel, and the above-mentioned backlight module.

[0051] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0052] The backlight module includes:

[0053] Surface light source, first light guide plate and first light source. Since the first light guide plate is located on the light-emitting side of the surface light source in the backlight module, the light emitted by the first light source can be emitted from the backlight module only after being reflected by the first mesh point, without passing through other film layers. In this way, the loss of the light emitted by the first light source during the propagation process is reduced, and the brightness of the light in the secondary viewing angle area when the backlight module is in the sharing mode is improved, thereby improving the brightness of the display screen of the display device including the backlight module in the sharing mode, and improving the display effect of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 is an exploded view of a backlight module provided in an embodiment of the present application;

[0056] Figure 2 yes Figure 1 The schematic diagram of the structure of the backlight module in the XZ plane is shown;

[0057] Figure 3 yes Figure 2 A front view of the first grid point in the backlight module in the XZ plane is shown;

[0058] Figure 4 yes Figure 2 A top view of the first grid point in the XY plane is shown;

[0059] Figure 5 Is another Figure 1 The schematic diagram of the structure of the backlight module in the XZ plane is shown;

[0060] Figure 6 is an exploded view of another backlight module provided in an embodiment of the present application;

[0061] Figure 7 yes Figure 6 The schematic diagram of the structure of the backlight module in the XZ plane is shown;

[0062] Figure 8 yes Figure 6 and Figure 7 The light path diagram of the backlight module shown is in the second anti-peeping mode;

[0063] Fig. 9 yes Figure 6 and Figure 7 The light path diagram of the backlight module shown is in the second sharing mode;

[0064] Fig.10 is an exploded view of another backlight module provided in an embodiment of the present application;

[0065] Fig.11 yes Fig.10 The schematic diagram of the structure of the backlight module in the XZ plane is shown;

[0066] Fig.12 yes Fig.11 The light path diagram of the backlight module shown is in the second anti-peeping mode;

[0067] Fig.13 yes Fig.11 A partial enlarged view of the anti-peeping structure in the backlight module is shown;

[0068] Fig.14 yes Fig.11 A partial enlarged view of the first prism in the anti-peeping structure is shown;

[0069] Fig.15 Another embodiment of the present application provides Fig.10 The schematic diagram of the structure of the backlight module in the XZ plane is shown;

[0070] Fig.16 This is another embodiment provided by the present application. Fig.10 The schematic diagram of the structure of the backlight module in the XZ plane is shown;

[0071] Fig.17 yes Fig.11 The light path diagram of the backlight module shown is in the second sharing mode;

[0072] Fig.18 yes Fig.11 A schematic diagram of light beam distribution of the backlight module shown in the second anti-peeping mode;

[0073] Fig.19 yes Fig.11 The backlight module is shown in a schematic diagram of light beam distribution in a second sharing mode;

[0074] Fig. 20 yes Fig.11 A front view of the second grid point in the backlight module in the XZ plane is shown;

[0075] Fig.21 yes Fig.11 A top view of the second grid point in the XY plane is shown;

[0076] Fig. 22 is a light path diagram of the second light guide plate when the seventh included angle θ2 is 20 degrees;

[0077] Fig.23 is a light path diagram corresponding to the second light guide plate when the seventh angle θ2 is within a range of less than or equal to 5 degrees;

[0078] Fig.24 yes Fig.11 The light path diagram of the reflector in the backlight module is shown;

[0079] Fig.25 is a perspective diagram of a backlight module provided in an embodiment of the present application that does not include a prism layer in a YZ plane;

[0080] Fig.26 yes Fig.11 The light path diagram of the backlight module in the YZ plane is shown;

[0081] Fig. 27 This is a schematic diagram of light beam distribution in the vertical direction of the light emitting surface of a backlight module provided in an embodiment of the present application;

[0082] Fig.28 is a schematic structural diagram of another backlight module provided in an embodiment of the present application in a YZ plane;

[0083] Fig.29 is a structural schematic diagram of another backlight module provided in an embodiment of the present application;

[0084] Fig.30 is a structural schematic diagram of another backlight module provided in an embodiment of the present application;

[0085] Fig.31 It is a structural schematic diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0086] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0087] The current in-vehicle display products mainly include the instrument cluster display system (ICD) located in front of the driver, the central information display system (CID), and the display system (CDD) located in front of the co-driver. Among them, the ICD display system and the CID display system are mainly used for the driver's operation and viewing, and the CDD display system can display screens containing entertainment information and screens containing navigation information.

[0088] In a usage scenario where there is a demand, such as when the co-pilot assists the driver in navigation, the information displayed by the CCD display system needs to have a wider viewing angle so that everyone in the car can see the display screen. This display mode is defined as the first sharing mode.

[0089] In another usage scenario where there is a need, for example, when the driver does not want the navigation screen to disturb the co-driver, the information displayed by the CCD display system needs to be displayed only in the driver's viewing direction and not obviously visible in other viewing directions. This display mode is defined as the first anti-peeping mode.

[0090] In another usage scenario where this is necessary, for example, when the CDD display system displays an image containing entertainment information, in order to avoid interfering with the driver, the CDD display system needs to turn on the anti-peeping mode, that is, only the co-pilot is expected to be able to see the image displayed on the CDD display system, and it is not obviously visible from the driver's viewing direction. This display mode is defined as the second anti-peeping mode.

[0091] In another usage scenario where there is a need, for example, when the CDD display system displays a screen containing navigation information, the CDD display system needs to turn on the sharing mode, that is, the driver and the co-driver can watch the screen displayed on the CDD display system at the same time, and other viewing directions are not obviously visible. This display mode is defined as the second sharing mode.

[0092] When the angle between the observer's viewing direction and the normal of the display surface is small (for example, the angle is between 0 degrees and ±20 degrees), it can be considered that the observer is observing the display screen in the primary viewing area; when the angle between the observer's viewing direction and the normal of the display surface is large (for example, the angle is between ±45 degrees and ±60 degrees), it can be considered that the observer is observing the display screen in the secondary viewing area. For this reason, for the CDD display system, the co-pilot observes the display screen of the CDD display system in the primary viewing area, while the driver observes the display screen of the CDD display system in the secondary viewing area.

[0093] Please refer to Figure 1 and Figure 2 , Figure 1 is an exploded view of a backlight module provided in an embodiment of the present application, Figure 2 yes Figure 1 The backlight module is a schematic structural diagram of the backlight module in the XZ plane. The backlight module may include: a surface light source 000 , a first light guide plate 100 and a first light source 200 .

[0094] The first light guide plate 100 and the surface light source 000 are stacked in the thickness direction, and the first light guide plate 100 is located at the light emitting side of the surface light source 000 .

[0095] The first light source 200 is located on the side of the first light guide plate 100 , and the orthographic projections of the first light source 200 and the first light guide plate 100 on the plane where the light emitting surface of the surface light source 000 is located do not overlap.

[0096] The thickness direction of the backlight module is the Z direction, and the light emitting surface of the surface light source 000 is a plane perpendicular to the thickness direction, that is, the XY plane.

[0097] Optionally, the surface light source 000 is a direct-type backlight (eg, Mini-LED backlight) surface light source, or the surface light source 000 is an edge-type backlight surface light source.

[0098] For examples, please refer to Figure 2 , Figure 2 The light path diagram when the surface light source 000 and / or the first light source 200 are turned on is shown. When the surface light source 000 is turned on, the surface light source 000 can emit light. When the surface light source 000 has a larger range of light-emitting angles (for example, the angle between the maximum light-emitting angle and the normal direction of the display surface is less than 90 degrees and greater than -90 degrees; for example, the angle between the maximum light-emitting angle and the normal direction of the display surface is ±89 degrees; for example, the angle between the maximum light-emitting angle and the normal direction of the display surface is ±80 degrees; for example, the angle between the maximum light-emitting angle and the normal direction of the display surface is ±60 degrees), the people in the car can see the display screen, and the backlight module is in the first sharing mode. When the first light source 200 is turned on and the surface light source 000 is turned off, the light emitted by the backlight module is concentrated in the secondary viewing angle area, and the backlight module is in the large viewing angle mode. In this case, the light brightness in the main viewing angle area is low, while the light brightness in the secondary viewing angle area is high. When the backlight module is integrated in the display device, the display screen of the display device can be observed in the secondary viewing area, while the display screen of the display device is difficult to observe in the primary viewing area, or the display screen of the display device is not clearly visible in the primary viewing area. At this time, the backlight module is in the first anti-peeping mode. It can be understood that when the surface light source 000 is turned on and the first light source 200 is turned on, the backlight module is in the first sharing mode, and the light brightness in the secondary viewing area can be further enhanced.

[0099] For examples, please continue to refer to Figure 2 , the surface light source 000 can be a collimated surface light source. When the surface light source 000 is a collimated surface light source, the surface light source has a narrower light emitting angle (for example, the angle between the maximum light emitting angle and the normal direction of the display surface is ±30 degrees; for example, the angle between the maximum light emitting angle and the normal direction of the display surface is ±20 degrees; for example, the angle between the maximum light emitting angle and the normal direction of the display surface is ±15 degrees). When the first light source 200 is turned off and the collimated surface light source 000 is turned on, the brightness of the light in the main viewing area is higher, while the brightness of the light in the secondary viewing area is lower; when the backlight module is integrated in the display device, the display screen of the display device can be observed in the main viewing area, while the display screen of the display device is difficult to observe in the secondary viewing area, or the display screen of the display device observed in the secondary viewing area is not obvious, and the backlight module is in the second anti-peeping mode. When the first light source 200 is turned on and the collimated surface light source 000 is turned on, the main viewing angle and the auxiliary viewing angle can simultaneously watch the picture displayed on the CDD display system. Since the surface light source 000 adopts a collimated surface light source, when the backlight module is integrated in the display device, it is difficult to observe the display screen of the display device in other viewing angles other than the main viewing angle and the auxiliary viewing angle, or the display screen of the display device observed in other viewing angles is not obvious. At this time, the backlight module is in the second sharing mode. It can be understood that when the first light source 200 is turned on and the collimated surface light source 000 is turned off, the backlight module is in the first anti-peeping mode.

[0100] In summary, the backlight module provided in the embodiment of the present application includes: a surface light source, a first light guide plate and a first light source. Since in the backlight module, the first light guide plate is located on the light-emitting side of the surface light source, the light emitted by the first light source can be emitted from the backlight module only after being reflected by the first grid point, without passing through other film layers. In this way, the loss of the light emitted by the first light source during the propagation process is reduced, and the brightness of the light in the secondary viewing angle area when the backlight module is in the sharing mode is improved, thereby improving the brightness of the display screen of the display device including the backlight module when in the sharing mode, and improving the display effect of the display device.

[0101] In some specific embodiments, please refer to Figure 1 and Figure 2 , the first light source 200 is a strip light source; the first mesh point 101 is a prism structure, and the length direction of the first mesh point 101 is parallel to the extension direction of the light source bar of the first light source 000. The first mesh point 101 is used to break the total reflection of the light emitted by the first light source 200 in the first light guide plate 100, so that the light can be emitted from the secondary viewing angle.

[0102] More specifically, the first light source 200 can be a light-emitting diode (LED) light bar. The first light source 200 can include: a plurality of LED light-emitting units 200a arranged in a row or an array. The strip-shaped light source means that the overall shape formed by all the LED light-emitting units of the first light source 200 is strip-shaped; for example, the first light source 200 can be a rectangular array composed of m×n LED light-emitting units, having m columns and n rows of LED light-emitting units, where m < n; the first light source 200 can be designed such that m columns of LED light-emitting units are distributed along the thickness direction of the first light guide plate 100, and n rows of LED light-emitting units are distributed along the extension direction of the strip-shaped light source. It should be noted that the numbering of the LED light-emitting unit 200a is not marked in Figure 2 and is marked in Fig.25 in the following text. It can be understood that the strip-shaped light source can also be a continuous light source, such as a surface light source or a line light source with uniform light emission.

[0103] Preferably, please refer to Figures 1 to 4 , where Figure 3 is Figure 2 the front view of the first light dots in the backlight module shown in the X-Z plane; Figure 4 is Figure 2 the top view of the first light dots in the X-Y plane shown. The first light dot 101 has a triangular prism structure; the first light dot 101 has a first side 101a in contact with the first light guide plate 100, and a second side 101b and a third side 101c connected to the first side 100. Among them, there is a first angle θ1 between the first side 101a and the second side 101b, a second angle γ1 between the first side 101a and the second side 101b, and a third angle between the second side 101b and the third side 101c

[0104] Preferably, the shape of the first side 101a is rectangular. The width of the first side 101a in the length direction of the first light dot 101 (i.e., the Y direction) is t, and the width of the first side 101a in the direction perpendicular to the length direction of the first light dot 101 (i.e., the X direction) is b. In some alternative embodiments, the width t of the first side 101a can be selected in the range of 35 microns to 100 microns, and the width b of the first side 101a can be selected in the range of 20 microns to 100 microns. When the width t of the first side 101a can be selected in the range of 35 microns to 100 microns and the width b of the first side 101a can be selected in the range of 20 microns to 100 microns, light can be emitted from the sub-viewing angle direction, and the light dots are not visibly obvious.

[0105] For example, the width t of the first side 101a can be one of 35 microns, 45 microns, 50 microns, 55 microns, 60 microns, 65 microns, 75 microns, 80 microns, 90 microns, and 100 microns, and the error range of the width t of the first side 101a is ±0.01 micron, and the width b of the first side 101a can be one of 25 microns, 35 microns, 40 microns, 41.7 microns, 45 microns, 45.5 microns, 50 microns, 51.7 microns, 56.3 microns, 53.5 microns, 55 microns, and 65 microns, and the error range of the width b of the first side 101a is ±0.02 micron.

[0106] In some optional embodiments, the first angle θ1 may range from 20 degrees to 70 degrees, and the second angle γ1 may range from 2 degrees to 20 degrees. When the first angle θ1 and the second angle γ1 are in the above range, the light emitted by the first light source 200 can be emitted in the secondary viewing area, and the light emitted by the first light source 200 is not obviously visible within the main viewing area, so that the display effect of the backlight module meets expectations. Preferably, the first angle θ1 may range from 20 degrees to 65 degrees, and the second angle γ1 may range from 2 degrees to 15 degrees.

[0107] In some optional embodiments, the first mesh point 101 may also be a quadrangular pyramid structure.

[0108] In some optional embodiments, the shape of the first side surface 101a may also be other shapes besides a rectangle. In this case, the maximum width t0 of the first side surface 101a in the length direction of the first dot 101 (i.e., the Y direction) is defined as the width of the first side surface 101a in the length direction of the first dot 101. Optionally, t0 ranges from 35 microns to 100 microns. The maximum width b0 of the first side surface 101a in the length direction perpendicular to the first dot 101 is defined as the width of the first side surface 101a in the length direction perpendicular to the first dot 101. Optionally, b0 ranges from 20 microns to 100 microns.

[0109] In some alternative embodiments, please refer to Figure 3 , the third angle It may also have a chamfer b1. In some embodiments, the chamfer b1 is an arc. Optionally, the radius of the arc is less than or equal to 30 microns, so that the display effect of the backlight module is better. And, when the radius of the arc is smaller, the more accurate control of the viewing angle of the backlight module can be achieved. Therefore, preferably, the radius of the arc is less than or equal to 10 microns. Further preferably, the radius of the arc is less than or equal to 5 microns. Still further preferably, the radius of the arc is less than or equal to 3 microns.

[0110] In order to realize the second anti-peeping mode and the second sharing mode, the surface light source can be a collimated surface light source. Figure 5 , Figure 5 Is another Figure 1 The structure diagram of the backlight module in the XZ plane is shown. The collimated surface light source 000a and the first light guide plate 100 are stacked in the thickness direction of the collimated surface light source 000a. The present invention does not specifically limit the form of the collimated surface light source 000a, as long as the light output angle on the light output surface of the collimated surface light source 000a is narrow. For example, when the light intensity emitted by the collimated surface light source 000a drops to 5% of the maximum light intensity as the angle changes, the angle between the emission angle and the direction of the maximum light intensity of the collimated surface light source 000a is no more than 30 degrees; for example, when the light intensity emitted by the collimated surface light source 000a drops to 5% of the maximum light intensity as the angle changes, the angle between the emission angle and the direction of the maximum light intensity of the collimated surface light source 000a is no more than 20 degrees; for example, when the light intensity emitted by the collimated surface light source 000a drops to 5% of the maximum light intensity as the angle changes, the angle between the emission angle and the direction of the maximum light intensity of the collimated surface light source 000a is no more than 15 degrees. The present invention does not limit the maximum light intensity emission direction of the collimated surface light source 000a; the maximum light intensity emission direction of the collimated surface light source 000a can be defined as the angle between the direction of the maximum light intensity of the collimated surface light source 000a and the normal direction. For example, the maximum light intensity emission direction of the collimated surface light source 000a can be the same as the normal direction of the display surface; for example, the maximum light intensity emission direction of the collimated surface light source 000a and the normal direction of the light emitting surface of the collimated surface light source 000a can have a certain angle, for example, the angle is within 5 degrees, within 10 degrees or within 20 degrees.

[0111] In some alternative embodiments, please refer to Figure 6 and Figure 7 , Figure 6 is an exploded view of another backlight module provided in an embodiment of the present application, Figure 7 yes Figure 6 The schematic diagram of the structure of the backlight module in the XZ plane is shown. The collimated surface light source 000a includes an anti-peeping structure 500 and a second light guide plate 300 stacked in the thickness direction; the second light guide plate 300 is located on the side of the anti-peeping structure 500 away from the first light guide plate 100, and the side of the second light guide plate 300 away from the anti-peeping structure 500 has a plurality of second mesh points 301.

[0112] The collimated surface light source 000a further includes a second light source 400, which is located on the side of the second light guide plate 300. The orthographic projections of the second light source 400 and the second light guide plate 300 on the plane where the light emitting surface of the collimated surface light source 000a is located do not overlap.

[0113] For examples, please refer to Figure 8 , Figure 8 yes Figure 6 and Figure 7 The light path diagram of the backlight module in the second anti-peeping mode shows that when the collimated surface light source 000a is turned on and the first light source 200 is turned off, the collimated surface light source 000a can emit collimated light to put the backlight module in the second anti-peeping mode.

[0114] Please refer to Fig. 9 , Fig. 9 yes Figure 6 and Figure 7 The light path diagram of the backlight module in the second sharing mode is shown. When the first light source 200 is turned on and the collimated surface light source 000a is turned on, the light emitted by the first light source 200 can be reflected by the plurality of first grid points 101 and then emitted. The collimated surface light source 000a can emit collimated light to put the backlight module in the second sharing mode.

[0115] In the examples of this application, please refer to Fig.10 and Fig.11 , Fig.10 is an exploded view of another backlight module provided in an embodiment of the present application. Fig.11 yes Fig.10 The schematic diagram of the structure of the backlight module in the XZ plane is shown. In the backlight module, the collimated surface light source 000a may include: an anti-peep structure 500 and a second light guide plate 300 stacked in the thickness direction. The second light guide plate 300 is located on the side of the anti-peep structure 500 away from the first light guide plate 100, and the side of the second light guide plate 300 away from the anti-peep structure 500 has a plurality of second grid points 301. The collimated surface light source 000 may also include: a second light source 400. The second light source 400 is located on the side of the second light guide plate 300, and the orthographic projection of the second light source 400 and the second light guide plate 300 on the plane where the light emitting surface of the collimated surface light source 000a is located does not overlap. In this way, the light emitted by the second light source 400 can be reflected by the plurality of second grid points 301 to the anti-peep structure 500, converted into collimated light by the anti-peep structure 500, and emitted from the first light guide plate 100.

[0116] Optionally, the second light source 400 is a strip light source. Specifically, the second light source 400 may be an LED light bar. The second light source 400 may include: a plurality of LED light-emitting units 400a arranged in a column or an array. Similar to the definition of the first light source being a strip light source, the strip light source means that the overall shape formed by all the LED light-emitting units in the second light source 400 is strip-shaped; for example, the second light source 400 may be a rectangular array composed of p×q LED light-emitting units, having p columns and q rows of LED light-emitting units, where p < q; the second light source 400 may be designed such that p columns of LED light-emitting units are distributed along the thickness direction of the first light guide plate 100, and q rows of LED light-emitting units are distributed along the extension direction of the strip light source. It should be noted that the numbers of the LED light-emitting units 400a are not marked in Fig.11 but are marked in Fig.25 hereinafter. It can be understood that the strip light source may also be a continuous light source, such as a surface light source or a line light source with uniform light emission.

[0117] Optionally, the first light source 200 and the second light source 400 are exactly the same.

[0118] In the embodiments of the present application, the anti-peeping structure 500 has multiple possible implementation manners. The embodiments of the present application will be schematically described by taking the following two possible implementation manners as examples:

[0119] In the first possible implementation manner, the anti-peeping structure 500 includes: a grating structure (not shown in the figure). In this case, the second dot 301 may be a circular dot, and the second dot 301 can break the total internal reflection of the light emitted by the second light source 400 in the second light guide plate 300, so that the light emitted by the second light source 400 is reflected by the second dot 301 to the grating structure. The grating structure can block part of the light exiting from the second light guide plate 300, convert the light exiting from the second light guide plate 300 into collimated light, and reduce the viewing angle range of the backlight module to achieve the anti-peeping function.

[0120] In the second possible implementation manner, please refer to Fig.11 , the anti-peeping structure 500 in the backlight module may include: a first substrate 501, and a plurality of strip-shaped first prisms 502 located on the first substrate 501. The plurality of first prisms 502 are located on the side of the first substrate 501 close to the second light guide plate 300, and the plurality of first prisms 502 can be closely arranged on the first substrate 501. The close arrangement means that there is no gap between any two adjacent first prisms 502.

[0121] Preferably, the length direction of the plurality of first prisms 502 is parallel to the extension direction of the light source bar of the second light source 400 (that is, the Y direction), and the length direction of the plurality of first prisms 502 is perpendicular to the XZ plane. In this way, the plurality of first prisms 502 can narrow the light emitted from the second light guide plate 300 in the horizontal direction of the light emitting surface of the backlight module (that is, the XY plane) and perpendicular to the extension direction of the light source bar of the second light source 400 (that is, the X direction), so that the backlight module can achieve an anti-peeping effect in the horizontal direction of its light emitting surface. It should be noted that in the present application, the direction perpendicular to the extension direction of the light source bar of the second light source 400 and parallel to the light emitting surface of the backlight module can be defined as the horizontal direction of the light emitting surface of the backlight module (that is, the X direction), and the direction parallel to the extension direction of the light source bar of the second light source 400 and parallel to the light emitting surface of the backlight module is defined as the vertical direction of the light emitting surface of the backlight module (that is, the Y direction).

[0122] For examples, please refer to Fig.12 , Fig.12 yes Fig.11 The light path diagram of the backlight module in the second privacy protection mode is shown. When the second light source 400 is turned on and the first light source 200 is turned off, the light emitted by the second light source 400 is reflected by the plurality of second mesh dots 301, and is emitted from the side of the second light guide plate 300 away from the plurality of second mesh dots 301, and is injected into the privacy protection structure 500. The first prism 501 in the privacy protection structure 500 can narrow the light emitted from the second light guide plate 300, so that the light emitted from the second light guide plate 300 is concentrated in the main viewing angle area, reducing the viewing angle range of the backlight module, so as to realize the second privacy protection mode of the backlight module.

[0123] Optionally, the material of the first substrate 501 is a light-transmitting material, which may specifically include a transparent polymer material. Preferably, the material of the first substrate 501 may be polyethylene terephthalate (PET), with a refractive index between 1.62 and 1.65. The thickness of the first substrate 100 may range from 40 microns to 160 microns, for example, the thickness may be 50 microns, 75 microns, 100 microns, 125 microns or 150 microns, preferably 125 microns. The material of the first prism 502 is a light-transmitting material, which may specifically include a transparent polymer material. Preferably, the material of the first prism 502 may be polycarbonate (PC), PET or a photocurable material. The thickness of the first prism 502 may range from 25 microns to 50 microns, for example, the thickness of the first prism 502 may preferably be 30 microns. When the material of the first prism 502 is PC material or PET material, the first prism 502 can be manufactured by hot pressing, wherein the refractive index of the PC material is between 1.58 and 1.59; preferably, the material of the first prism 502 is a photocurable material; when the material of the first prism 502 is a photocurable material, the first prism 502 can be cured by ultraviolet (UV) light irradiation, and the cured photocurable material has anti-scratch performance to reduce the probability of the surface of the first prism 502 being scratched by other structures. Specifically, the refractive index of the photocurable material is between 1.5 and 1.57.

[0124] In some specific embodiments, please refer to Fig.13 , Fig.13 yes Fig.11 A partial enlarged view of the anti-peeping structure in the backlight module is shown. The first prism 502 is a triangular prism structure, and the first prism 502 has a fourth side 502a in contact with the first substrate 501, and a fifth side 502b and a sixth side 502c connected to the fourth side 502a. The fourth angle α between the fourth side 502a and the fifth side 502b is greater than or equal to the fifth angle β between the fourth side 502a and the fifth side 502c, and the fifth side 502b in the first prism 502 is close to the second light source 400 relative to the sixth side 502c. In this way, it can be ensured that the light emitted by the second light guide plate 300 is refracted on the fifth side 502b and is totally reflected on the sixth side 502c of the first prism 502, so that the light emitted by the second light guide plate 300 is concentrated in the main viewing area, ensuring a good anti-peeping effect of the backlight module.

[0125] Optionally, the angle range of the fourth angle α is 45 degrees to 90 degrees, or 50 degrees to 85 degrees, or 60 degrees to 72 degrees. The angle of the fifth angle β is 45 degrees to 70 degrees, or 50 degrees to 65 degrees, or 55 degrees to 60 degrees, or 53 degrees to 57 degrees. Preferably, the angle of the fourth angle α can be one of 65.5 degrees, 69 degrees, 70 degrees, and 71 degrees, and the error range of the fourth angle α is ±1 degree. The angle of the fifth angle β can be one of 54 degrees, 55 degrees, and 56 degrees, and the error range of the fifth angle β is ±1 degree. In this way, it can be ensured that when the backlight module is in sharing mode, the brightness of the light of the backlight module in the secondary viewing area is high, and the light emitted from the second light guide plate 300 can be refracted by the first prism 502. The collimation degree is higher, so that the light emitted from the second light guide plate 300 is concentrated in the main viewing area, ensuring that the anti-peeping effect of the backlight module is better. In some embodiments, the fourth angle α and the fifth angle β may be equal in degree, which can reduce the process complexity and cost of manufacturing the anti-peeping structure 500. For example, the fourth angle α and the fifth angle β may both be within the range of 53 to 57 degrees; for example, the fourth angle α and the fifth angle β may both be 54 degrees, or 55 degrees, or 56 degrees.

[0126] In some specific embodiments, please refer to Fig.14 , Fig.14 yes Fig.11 A partial enlarged view of the first prism in the anti-peeping structure shown. There is a chamfer at the sixth angle ω between the fifth side 502b and the sixth side 502c in the first prism 502. Moreover, the smaller the radius of the arc, the more accurate control of the viewing angle of the backlight module can be achieved. In some embodiments, the chamfer a is an arc, and the range of the radius of the arc is less than or equal to 30 microns. Preferably, the range of the radius of the arc is less than or equal to 5 microns. Preferably, the range of the radius of the arc is less than or equal to 3 microns. Further preferably, the range of the radius of the arc is less than or equal to 1.5 microns. In this way, the light emitted from the second light guide plate 300 can be refracted by the first prism 502 with a higher degree of collimation, so that the light emitted from the second light guide plate 300 is concentrated in the main viewing angle area, ensuring that the anti-peeping effect of the backlight module is better.

[0127] Preferably, if Fig.11As shown, the anti-peep structure 500 may also include: a particle diffusion layer 503, and the particle diffusion layer 503 may include: a transparent film layer, and a plurality of particles located in the transparent film layer. The particles are particles with scattering properties, and the light emitted from the first substrate 501 can be diffused by the scattering particles in the particle diffusion layer 503. In this way, the particle diffusion layer 503 can play a role in homogenizing the light emitted from the first substrate 501, so as to improve the uniformity of the light emitted from the backlight module, thereby improving the display effect of the display device including the backlight module. For example, the particles may include: at least one of polymethyl methacrylate, polymethyl butylacrylate, silicone, titanium dioxide and barium sulfate.

[0128] In the present application, there are multiple possible implementations of the structure of the transparent film layer. The present application embodiment uses the following two possible implementations as examples for schematic illustration:

[0129] In the first possible implementation, please refer to Fig.15 , Fig.15 Another embodiment of the present application provides Fig.10 The schematic structural diagram of the backlight module in the XZ plane is shown, and the transparent film layer is the first substrate 501 .

[0130] In the second possible implementation, Fig.16 As shown, Fig.16 This is another embodiment provided by the present application. Fig.10 The schematic structural diagram of the backlight module in the XZ plane is shown, and the transparent film layer is the film layer on the side of the first substrate 501 away from the plurality of first prisms 502 .

[0131] Optionally, the concentration range of the particles in the transparent film layer is 10% to 90%. The concentration range refers to the ratio of the volume of the particles in the transparent film layer to the volume of the transparent film layer.

[0132] When the first grid point 101 is used in conjunction with the collimated surface light source 000a, preferably, the shape of the first side surface 101a is a rectangle. The value range of the width t of the first side surface 101a in the length direction of the first grid point 101 (i.e., the Y direction), and the value range of the width b of the first side surface 101a in the length direction perpendicular to the first grid point 101 (i.e., the X direction) can determine the emission direction of the light emitted by the first light source 200 after passing through the first light guide plate 100 and the brightness of the light in each viewing angle area. There are multiple optional ranges for the value range of the width t of the first side surface 101a in the length direction of the first grid point 101, and the value range of the width b of the first side surface 101a in the length direction perpendicular to the first grid point 101. The embodiment of the present application is schematically illustrated with the following three cases:

[0133] In the first case, the width t and b of the first side surface 101a may both be in the range of less than 10 microns or greater than 200 microns. When the width t and b of the first side surface 101a are both in the range of less than 10 microns or greater than 200 microns, if the backlight module is in the second sharing mode, the light emitted by the backlight module may have brightness peaks in the main viewing area and the two secondary viewing areas on both sides of the main viewing area (respectively: the area with an angle of -45 degrees to -60 degrees with the normal direction of the light emitting surface of the backlight module; the area with an angle of 45 degrees to 60 degrees with the normal direction of the light emitting surface of the backlight module).

[0134] In the second case, the width t of the first side surface 101a may be in the range of 55 microns to 200 microns, and the width b of the seventh side surface 101a may be in the range of 65 microns to 200 microns. When the width t of the first side surface 101a is in the range of 55 microns to 200 microns, and the width b of the first side surface 101a is in the range of 65 microns to 200 microns, if the backlight module is in the second sharing mode, the light emitted by the backlight module may have a brightness peak in the main viewing area and the secondary viewing area located on one side of the main viewing area (the area with an angle of -45 degrees to -60 degrees with the normal direction of the light emitting surface of the backlight module).

[0135] In the third case, the width t of the first side surface 101a can be selected within the range of 10 microns to 55 microns, and the width b of the first side surface 101a can be selected within the range of 25 microns to 65 microns. When the width t of the first side surface 101a is selected within the range of 10 microns to 55 microns, and the width b of the first side surface 101a is selected within the range of 25 microns to 65 microns, if the backlight module is in the second sharing mode, the light emitted by the backlight module may have a brightness peak in the main viewing area and the secondary viewing area located on one side of the main viewing area (the area with an angle of -45 degrees to -60 degrees with the normal direction of the light emitting surface of the backlight module), and compared with the second case, the brightness of the light in the secondary viewing area is higher.

[0136] Preferably, if Fig.11 As shown, the first light source 200 and the second light source 400 are both strip light sources, and the extension direction of the light source bar of the second light source 400 is the same as the extension direction of the light source bar of the first light source 200. Further preferably, the second grid point 301 is a prism, and the length direction of the second grid point 301 is parallel to the extension direction of the light source bar of the second light source 400, that is, Fig.11As shown, the length direction of the second grid point 301 is perpendicular to the XZ plane. The second grid point 301 is used to break the total reflection of the light emitted by the second light source 400 in the second light guide plate 300. In this way, when the backlight module is used in the CDD display system in the vehicle display system, the backlight module realizes a sharing mode in the horizontal direction of the display surface of the CDD display system to improve the utilization rate of light. Among them, the light emitting surface of the backlight module is parallel to the display surface of the CDD display system and parallel to the XY plane, and the horizontal direction of the light emitting surface of the backlight module and the display surface of the CDD display system is the X direction.

[0137] When the length direction of the first prism 502 is parallel to the extension direction of the light source bar of the second light source 400, and when the width t of the first side surface 101a in the length direction of the first grid point 101 and the width b of the first side surface 101a in the length direction perpendicular to the first grid point 101 are in the third case, please refer to Fig.17 , Fig.17 yes Fig.11 The light path diagram of the backlight module in the second sharing mode is shown. After the first light source 200 is turned on, the light emitted by the first light source 200 is reflected by the multiple first mesh points 101 and emitted from the side of the first light guide plate 100 away from the multiple first mesh points 101. The light emitted by the first light source 200 is concentrated in the secondary viewing angle area with an angle of -45 degrees to -60 degrees with the normal direction of the light-emitting surface of the backlight module, and there is no light in the secondary viewing angle area on the other side of the main viewing angle area as much as possible. In this way, when the backlight module is integrated into the CDD display system in the vehicle display system, since the driver is usually located on the side of the co-pilot, the co-pilot watches the picture in the main viewing angle area, and the driver watches the picture in the secondary viewing angle area on one side of the main viewing angle area. Therefore, if there are brightness peaks in the main viewing angle area and the secondary viewing angle area on one side of the main viewing angle area, and there is no brightness peak in the secondary viewing angle area on the other side of the main viewing angle area, the utilization rate of the light emitted by the backlight module can be effectively improved.

[0138] At the same time, it can be known from the above that after the second light source 400 is turned on, the light emitted by the second light source 400 is concentrated in the main viewing angle area.

[0139] Therefore, when the first light source 300 is turned on and the second light source 400 is turned on, the backlight module can be in the second sharing mode. And for the light emitted by the backlight module, there are brightness peaks in the main viewing area and the secondary viewing area on one side of the main viewing area, while there is no brightness peak in the secondary viewing area on the other side of the main viewing area. Among them, the brightness of the light emitted by the backlight module in the secondary viewing area can reach more than 70% of the brightness in the main viewing area, thereby improving the brightness of the display device including the backlight module in the secondary viewing area, thereby improving the display effect of the display device in the second sharing mode.

[0140] For examples, please refer to Fig.18 , Fig.18 yes Fig.11 FIG. 1 is a schematic diagram showing the light beam distribution of the backlight module in the second anti-peeping mode. Fig.18 In the figure, the origin O is any point on the light-emitting surface of the backlight module, usually the center point of the backlight module. Each semicircle with the origin O as the center represents: each different brightness, the unit is: candela per square meter. Each straight line passing through the origin O represents: the angle between each different observation direction and the normal of the light-emitting surface of the backlight module, wherein when the angle is 0 degrees, it indicates that the observation direction is perpendicular to the light-emitting surface of the backlight module; when the angle is a negative number, it indicates that the observation direction is on one side of the normal of the light-emitting surface of the backlight module (for example, the left side); when the angle is a positive number, it indicates that the observation direction is on the other side of the normal of the light-emitting surface of the backlight module (for example, the right side). It should be noted that, Fig.18 The thick solid line in represents the brightness distribution of the light beam on the light-emitting surface of the backlight module in the horizontal direction; the thin solid line represents the brightness distribution of the light beam on the light-emitting surface of the backlight module in the vertical direction. When the backlight module is in the second anti-peeping mode, the light emitted by the second light source 400 is reflected by the plurality of second mesh dots 301, and is emitted from the side of the second light guide plate 300 away from the plurality of second mesh dots 301, and is injected into the anti-peeping structure 500. The first prism 501 in the anti-peeping structure 500 can narrow the light emitted from the second light guide plate 300, so that the light emitted from the second light guide plate 300 is concentrated in the central area A of the light-emitting surface of the backlight module.

[0141] like Fig.19 As shown, Fig.19 yes Fig.11 The backlight module is shown in the second sharing mode beam distribution schematic diagram. Fig.19 The meaning of the lines shown can be found in Fig.18, no further details are given here. When the backlight module is in the second sharing mode, the light emitted by the first light source 200 is reflected by the multiple first dots 101, and is emitted from the side of the first light guide plate 100 away from the multiple first dots 101. The light emitted by the first light source 200 is concentrated in the area B with an angle of -45 degrees to -60 degrees with the normal direction of the light emitting surface of the backlight module. At the same time, it can be seen from the above that after the second light source 400 is turned on, the light emitted by the second light source 400 is concentrated in the central area A. It should be noted that Fig.19 The thick solid line in the figure represents the brightness distribution of the light beam on the light emitting surface of the backlight module in the horizontal direction; the thin solid line represents the brightness distribution of the light beam on the light emitting surface of the backlight module in the vertical direction.

[0142] In some specific embodiments, please refer to Fig. 20 and Fig.21 , Fig. 20 yes Fig.11 The front view of the second grid point 301 in the backlight module in the XZ plane is shown; Fig.21 yes Fig.11 The second grid point 301 is a top view of the XY plane. The second grid point 301 is a prism structure. The second grid point 301 has a seventh side surface 301a in contact with the second light guide plate 300, and an eighth side surface 301b and a ninth side surface 301c connected to the seventh side surface 301a. There is a seventh angle θ2 between the seventh side surface 301a and the eighth side surface 301b, an eighth angle γ2 between the seventh side surface 301a and the eighth side surface 301b, and a ninth angle γ2 between the eighth side surface 301b and the ninth side surface 301c. Preferably, the seventh side surface 301a is rectangular in shape. The seventh side surface 301a has a width v in the length direction of the second mesh point 301 (ie, the Y direction), and a width c in the length direction perpendicular to the second mesh point 301 (ie, the X direction).

[0143] Optionally, the width v of the seventh side surface 301a in the length direction of the second dot 301 (i.e., the Y direction) ranges from 35 microns to 100 microns, and the width c of the seventh side surface 301a in the length direction perpendicular to the second dot 301 (i.e., the X direction) ranges from 20 microns to 100 microns. When c and v are in the above ranges, the brightness and viewing angle of the second anti-peeping state can reach an ideal state, ensuring the display effect of the display device. Preferably, the width of the seventh side surface 301a in the length direction of the second dot 301 (i.e., the Y direction) ranges from 10 microns to 55 microns, and the width of the seventh side surface 301a in the length direction perpendicular to the second dot 301 (i.e., the X direction) ranges from 40 microns to 55 microns.

[0144] For example, the width of the seventh side 301a in the length direction of the second dot 301 can be one of 35 microns, 45 microns, 50 microns, and 55 microns, and the error range of the width of the seventh side 301a in the length direction of the second dot 301 is ±0.01 micron, the width of the seventh side 301a in the length direction perpendicular to the second dot 301 can be one of 45 microns, 45.5 microns, 50 microns, 51.7 microns, 53.5 microns, and 55 microns, and the error range of the width of the seventh side 301a in the length direction perpendicular to the second dot 301 is ±0.02 micron.

[0145] Preferably, please refer to Fig. 20 , the eighth angle γ2 is greater than the seventh angle θ2, and the eighth side surface 301b of the second grid point 301 is closer to the second light source 400 than the ninth side surface 301c. In this way, the control accuracy of the second grid point 301 on the light emitted by the second light source 400 can be guaranteed, thereby ensuring the anti-peeping effect of the backlight module.

[0146] In the present application, the angle range of the eighth angle γ2 can be 10 to 90 degrees, or 15 to 60 degrees, or 30 to 60 degrees, or 40 to 60 degrees, or 55 to 60 degrees, or 20 to 45 degrees, or 25 to 35 degrees, or 26 to 30 degrees; the angle range of the fifth angle θ can be 1 to 30 degrees, or 1 to 20 degrees, or 1.5 to 5 degrees, or 1.5 to 4 degrees, or 1.5 to 3 degrees. When the backlight module is in the anti-peep mode, the smaller the angle of the eighth angle γ1, the lower the brightness of the light of the backlight module in the main viewing area; when the backlight module is in the sharing mode, the larger the angle of the eighth angle γ2, the lower the brightness of the light of the backlight module in the secondary viewing area.

[0147] For example, the eighth angle γ2 can be one of 26.5 degrees, 27.5 degrees, 28.5 degrees, and 29.5 degrees, and the error range of the eighth angle γ2 is ±0.5 degrees. In this case, it can be ensured that when the backlight module is in the anti-peep mode and the sharing mode, the brightness of the backlight module in the main viewing area and the secondary viewing area is high.

[0148] Please refer to Fig. 22 and Fig.23 , Fig. 22 is the light path diagram of the second light guide plate when the seventh angle θ2 is 20 degrees, Fig.23It is the light path diagram of the second light guide plate when the angle of the seventh angle θ2 is less than or equal to 5 degrees. When the size of the second light guide plate 300 and the light emitted by the second light source 400 are the same, when the angle of the fifth angle θ is 20 degrees, one second grid point 301 will break the total reflection of the light emitted by the second light source 400 in a larger range in the second light guide plate 300; when the angle of the seventh angle θ2 is less than or equal to 5 degrees, one second grid point 301 only breaks the total reflection of the light emitted by the second light source 400 in a smaller range in the second light guide plate 300. That is, the smaller the seventh angle θ2 is, the higher the control accuracy of the second grid point 301 on the light emitted by the second light source 400 is. Preferably, the angle of the seventh angle θ2 is less than or equal to 3.5 degrees. Considering the difficulty of the manufacturing process, the angle of the seventh angle θ2 is in the range of 1.5 degrees to 3.5 degrees.

[0149] For example, the seventh angle θ2 can be one of 1.5 degrees, 2 degrees, 2.5 degrees, 3 degrees, and 3.5 degrees, and the error range of the fifth angle θ is ±0.5 degrees. In this way, the second grid point 301 has a high control accuracy on the light emitted by the second light source 400, which can ensure the anti-peeping effect of the backlight module.

[0150] In some embodiments of this application, please refer to Fig. 20 , the ninth angle between the eighth side surface 301b and the eighth side surface 301c in the second grid point 301 There is a chamfer b2. In some embodiments, the chamfer b2 is an arc. In order to ensure that the anti-peeping effect of the backlight module is better when it is in the anti-peeping mode, the radius of the arc needs to be less than or equal to 30 microns. Preferably, when the radius of the arc is not greater than 10 microns, it can be ensured that the backlight module is in the sharing mode, and the light brightness in the main viewing area and the secondary viewing area is high; further preferably, the radius of the arc is less than or equal to 5 microns, so that it can be ensured that when the backlight module is in the anti-peeping mode and the sharing mode, the light brightness in the main viewing area and the secondary viewing area is high. Further preferably, the radius of the arc can be less than or equal to 3 microns. In this way, the light brightness in the main viewing area and the secondary viewing area can be further improved when the backlight module is in the anti-peeping mode and the sharing mode.

[0151] In some optional embodiments, the second mesh point 301 may also be a quadrangular pyramid structure.

[0152] In some optional embodiments, the shape of the seventh side surface 301a may also be other shapes besides a rectangle. In this case, the maximum width v0 of the seventh side surface 301a in the length direction of the second mesh point 301 (i.e., the Y direction) is defined as the width of the seventh side surface 301a in the length direction of the second mesh point 301. Optionally, v0 ranges from 35 microns to 100 microns. The maximum width c0 of the seventh side surface 301a in the length direction perpendicular to the second mesh point 301 is defined as the width of the seventh side surface 301a in the length direction perpendicular to the second mesh point 301. Optionally, c0 ranges from 20 microns to 100 microns.

[0153] In some specific embodiments of the present application, the shapes and sizes of the first dots 101 and the second dots 301 may be the same, that is, the sizes and angles of the first dots 101 and the second dots 301 may be the same.

[0154] In some specific embodiments of the present application, the orientations of the first mesh point 101 and the second mesh point 301 may be the same or opposite.

[0155] Preferably, the density of the first dots 101 at any position in the first light guide plate 100 is positively correlated with the distance between the first light source 200 and any position, that is, the density of the first dots 101 at any position in the first light guide plate 100 tends to increase as the distance between the arbitrary position and the first light source 200 increases. Similarly, the density of the second dots 301 at any position in the second light guide plate 300 is positively correlated with the distance between the second light source 400 and any position. In this way, it is possible to ensure that light is evenly transmitted in the first light guide plate 100 and the second light guide plate 300, thereby improving the uniformity of the brightness of the backlight module.

[0156] Optionally, the material of the first light guide plate 100 and the second light guide plate 300 may include: polymethyl methacrylate (English: Polymethyl methacrylate; abbreviated: PMMA), PC material, PET material or photocurable material, and the refractive index can be selected in the range of 1.3 to 1.65. For example, the first light guide plate 100 and the second light guide plate 300 include PC material, and the refractive index of the PC material is between 1.58 and 1.59. The first grid point 101 and the second grid point 301 can be manufactured by an injection molding process or a hot pressing process. The thickness of the first light guide plate 100 and the second light guide plate 300 can be determined according to the size of the display device including the backlight module. For example, when the display device including the backlight module is a mobile phone, the thickness of the first light guide plate 100 and the second light guide plate 300 are both in the range of 300 microns to 500 microns. For example, the thickness of the first light guide plate 100 and the second light guide plate 300 can be 400 microns or 500 microns. When the display device including the backlight module is a CDD display system, the thickness of the first light guide plate 100 and the second light guide plate 300 are both in the range of 1800 microns to 2100 microns. For example, the thickness of the first light guide plate 100 and the second light guide plate 300 can both be 2000 microns.

[0157] It should be noted that the materials of the first light guide plate 100 and the second light guide plate 300 may be the same or different.

[0158] In some specific embodiments of the present application, a first combination of the first grid point 101 and the first light guide plate 100 can be completely identical to a second combination of the second grid point 301 and the second light guide plate 300, so that the first combination and the second combination can be manufactured through a one-time development process, saving development costs while reducing process complexity.

[0159] In the examples of this application, please refer to Fig.11 The collimated surface light source 000 may further include: a reflective sheet 600 located on a side of the second light guide plate 400 away from the anti-peep structure 500. Fig.24 As shown, Fig.24 yes Fig.11 The reflective sheet 600 can be used to reflect the light transmitted from the second mesh point 301 back to the second light guide plate 300, thereby improving the utilization rate of the light and the brightness of the light emitted by the backlight module in the anti-peeping mode.

[0160] Optionally, the reflector 600 is a specular reflector. For example, the reflector 600 may be a silver reflector or an Enhanced Specular Reflector (ESR). In this way, the reflector 600 may reflect the light transmitted from the first mesh point 101 back to the second light guide plate 300 in the form of specular reflection, thereby preventing the light emitted by the second light source 400 from being scattered and ensuring the anti-peeping effect of the backlight module.

[0161] In this application, please refer to Fig.11 , the collimated surface light source 000 may further include: a prism layer 700 located between the second light guide plate 300 and the reflector 600. The prism layer 700 may include: a second substrate 701, and a plurality of strip-shaped second prisms 702 located on the second substrate 701, the second prisms 702 are located on a side of the second substrate 701 close to the second light guide plate 300, and the length direction of the plurality of second prisms 702 is perpendicular to the extension direction of the light source bar of the second light source 300. Among them, the length direction of the second prism 702 is parallel to the XZ plane, and the plurality of second prisms 702 are closely arranged on the second substrate 702, that is, there is no gap between any two adjacent second prisms 702. In this way, the second prism 702 can narrow the light beam in the vertical direction of the light emitting surface of the backlight module to improve the overall brightness of the backlight module.

[0162] It should be noted that the side of the second substrate 701 away from the second prism 702 may be a reflective surface. For example, a reflective material may be coated on the side of the second substrate 701 away from the second prism 702. In this way, the reflective sheet 600 does not need to be provided in the backlight module, which simplifies the film structure of the backlight module.

[0163] Preferably, the second prism 702 has a tenth side surface in contact with the second substrate 701, and an eleventh side surface and a twelfth side surface connected to the tenth side surface. The angle of the tenth angle between the tenth side surface and the eleventh side surface is equal to the angle of the eleventh angle between the tenth side surface and the twelfth side surface, and the angle of the twelfth angle between the eleventh side surface and the twelfth side surface is 90 degrees, that is, the cross section of the second prism 702 in the YZ plane is an isosceles right triangle.

[0164] For examples, please refer to Fig.25 and Fig.26 , Fig.25 is a light path diagram of a backlight module provided in an embodiment of the present application that does not include a prism layer in the YZ plane, Fig.26 yes Fig.11 The light path diagram of the backlight module in the YZ plane is shown. Fig.25 compared to, Fig.26The light beam on the light-emitting surface of the backlight module shown is narrowed in the vertical direction, and the brightness peak is significantly improved, and the overall brightness of the backlight module can be increased by 20% to 30%.

[0165] For examples, please refer to Fig. 27 , Fig. 27 Schematic diagram of the light beam distribution of a backlight module in the vertical direction of the light emitting surface of the backlight module provided by an embodiment of the present application. In addition to the meaning represented by the thickness of the line, Fig. 27 The meaning can be found in Fig.18 , I will not go into details here. Fig. 27 In FIG. 1 , the thick solid line indicates the beam distribution in the vertical direction of the light-emitting surface of the backlight module without the second prism 702, and the thin dotted line indicates the beam distribution in the vertical direction of the light-emitting surface of the backlight module including the second prism 702. Fig. 27 It can be seen that, for the backlight module including the second prism 702 , the light beam in the vertical direction of the light emitting surface of the backlight module is narrowed and the brightness is improved.

[0166] In the examples of this application, please refer to Fig.28 , Fig.28 It is a schematic diagram of the structure of another backlight module in the YZ plane provided by an embodiment of the present application. The first light guide plate 100 may have a plurality of strip-shaped third prisms 102 on one side away from the plurality of first dots 101, and the second light guide plate 300 may have a plurality of strip-shaped fourth prisms 302 on one side away from the plurality of second dots 301, and the length direction of the plurality of third prisms 102 and the length direction of the plurality of fourth prisms 302 are both parallel to the length direction of the second prism 702. Among them, the plurality of third prisms 102 may be closely arranged on the first light guide plate 100, and closely arranged means that there is no gap between any two adjacent third prisms 102. The plurality of fourth prisms 302 may be closely arranged on the first light guide plate 300, and closely arranged means that there is no gap between any two adjacent fourth prisms 302.

[0167] In the present application, the shapes and structures of the third prism 102 and the fourth prism 302 may be implemented in a variety of ways. The present application embodiment uses the following two possible implementations as examples for schematic illustration:

[0168] In a first possible implementation manner, the shapes and structures of the third prism 102 and the fourth prism 302 are the same as the shapes and structures of the second prism 702 , and are not described in detail herein.

[0169] In the second possible implementation, please refer to Fig.28 The cross sections of the third prism 102 and the fourth prism 302 in the YZ plane are both arcuate.

[0170] It should be noted that, in other optional implementations, the cross-sections of the third prism 102 and the fourth prism 302 may both be trapezoidal in shape. This is not limited in the present embodiment.

[0171] In this way, the third prism 102 and the fourth prism 302 can also narrow the light beam in the vertical direction of the light emitting surface of the backlight module, thereby further improving the overall brightness of the backlight module.

[0172] It should be noted that the backlight module only needs to ensure that it has at least one of the third prism 102 on the first light guide plate 100, the fourth prism 302 on the second light guide plate 200 and the prism layer 700, so as to narrow the light beam in the vertical direction of the light output surface of the backlight module.

[0173] In this application, please refer to Fig.29 , Fig.29 8 is a structural diagram of another backlight module provided in an embodiment of the present application, and the backlight module may further include a frame 800. The first light guide plate 100, the second light guide plate 300, the anti-peep structure 500, the first light source 200 and the second light source 400 in the backlight module are all located in the frame 800.

[0174] Optional, such as Fig.29 As shown, the frame 800 may include: a back plate 801, the back plate 801 has a first groove 801a, a second groove 801b and a third groove 801c connected in sequence, the opening surface of the first groove 801a is coplanar with the bottom surface of the second groove 801b, and the opening surface of the second groove 801b is coplanar with the bottom surface of the third groove 801c. Among them, the reflector 600 is located in the first groove 801a, the second light guide plate 300 and the second light source 400 are both located in the second groove 801b, the first light guide plate 100 and the first light source 200 are both located in the third groove 801c, and the anti-peep structure 200 is also located in the second groove 801b. The back plate 801 can effectively support each film layer structure in the backlight module.

[0175] At the same time, the reflective sheet 600 is located in the first groove 801a, the second light guide plate 300 and the second light source 400 are both located in the second groove 801b, and the first light guide plate 100 and the first light source 200 are both located in the third groove 801c. A certain distance can be selectively provided between the first light guide plate 100 and the reflective sheet 600 and / or a certain distance can be provided between the second light guide plate 300 and the anti-peep structure 500 to avoid damage caused by the mutual force exerted between the first grid points 101 in the first light guide plate 100 and the surface of the reflective sheet 600 and / or the second grid points 301 in the second light guide plate 300 and the surface of the anti-peep structure 500, thereby affecting the display effect of the display device including the backlight module.

[0176] It should be noted that since the distance between the first light guide plate 100 and the reflective sheet 600 and the distance between the second light guide plate 300 and the anti-peep structure 500 are positively correlated with the attenuation degree of the overall brightness of the backlight module, the range of the distance between the first light guide plate 100 and the reflective sheet 600 and the distance between the second light guide plate 300 and the anti-peep structure 500 should not be too large to ensure that the overall brightness of the backlight module is high.

[0177] Optionally, the distance between the first light guide plate 100 and the reflective sheet 600 and the distance between the second light guide plate 300 and the anti-peeping structure 500 may both be within a range of not less than 0.1 mm and not more than 0.5 mm.

[0178] It should be noted that an annular support structure may be provided between the anti-peeping structure 500 and the second light guide plate 300, so that there is a certain distance between the anti-peeping structure 500 and the second light guide plate 300, so as to avoid the first prism 502 in the anti-peeping structure 500 and the surface of the second light guide plate 300 from exerting force on each other and causing damage. The distance may range from 0.1 mm to 0.5 mm.

[0179] In the present application, the frame 800 may further include: a plastic frame 802 connected to the edge of the back plate 801, the plastic frame 802 having a panel bearing portion 802a, and the panel bearing portion 802a is used to bear the display panel.

[0180] In the embodiment of the present application, there are many possible implementations of the positional relationship between the first light source 200 and the second light source 400 in the frame 800. The embodiment of the present application takes the following two possible implementations as examples for schematic illustration:

[0181] In the first possible implementation, Fig.28 As shown, the first light source 200 and the second light source 400 are located on the same side of the frame 800. In this way, the width of the frame of the backlight module can be reduced.

[0182] In the second possible implementation, Fig.30 As shown, Fig.30 8 is a schematic diagram of the structure of another backlight module provided by the embodiment of the present application. The first light source 200 and the second light source 400 are respectively located on two opposite sides of the frame 800. This is conducive to heat dissipation of the backlight module during operation.

[0183] In summary, the backlight module provided in the embodiment of the present application includes: a collimated surface light source, a first light guide plate and a first light source. Since in the backlight module, the first light guide plate is located on the light-emitting side of the collimated surface light source, the light emitted by the first light source can be emitted from the backlight module only after being reflected by the first grid point, without passing through other film layers. In this way, the loss of the light emitted by the first light source during the propagation process is reduced, and the brightness of the light in the secondary viewing angle area of ​​the backlight module in the sharing mode is improved, thereby improving the brightness of the display screen of the display device including the backlight module in the sharing mode, thereby improving the display effect of the display device.

[0184] The present application also provides a display device, which may include a display panel and the above-mentioned backlight module. Fig.31 As shown, Fig.31 001 is a schematic diagram of the structure of a display device provided in an embodiment of the present application. The display device comprises any of the above-mentioned backlight modules and a display panel 001, and the display panel 001 is located on the panel bearing portion 802a in the backlight module. Optionally, the display panel 001 can be connected to the backlight module through a foam 002.

[0185] The display panel 001 is a liquid crystal display panel, and may include: an array substrate and a color filter substrate arranged opposite to each other, a first polarizer located on a side of the array substrate away from the color filter substrate, and a second polarizer located on a side of the color filter substrate away from the array substrate.

[0186] The display device may be any product or component having a display function, such as a liquid crystal panel, electronic paper, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and a CDD display system in a vehicle display system.

[0187] It can be understood that the application scenario of the display device is not limited to the CDD display system in the vehicle display system.

[0188] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0189] In the present application, the description of the term "range" in the above embodiments should include the endpoint values. For example, the term "range is 45 degrees to 90 degrees" means that the range includes the endpoint value 45 degrees and the endpoint value 90 degrees.

[0190] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0191] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A backlight module, characterized in that: include: A surface light source, wherein the surface light source is a collimated surface light source; A first light guide plate stacked with the surface light source in the thickness direction, the first light guide plate is located at the light emitting side of the surface light source, and a side of the first light guide plate close to the surface light source has a plurality of first grid points, and the first grid points are prism structures; and a first light source, the first light source being located on a side of the first light guide plate, the first light source having no overlap with an orthographic projection of the first light guide plate on a plane where a light emitting surface of the surface light source is located; the first light source being a strip light source; The length direction of the first mesh dots is parallel to the extension direction of the light source strip of the first light source, and the first mesh dots are used to break the total reflection of the light emitted by the first light source in the first light guide plate, so that the light can be emitted from the secondary viewing angle; The collimated surface light source comprises an anti-peeping structure and a second light guide plate stacked in a thickness direction; the second light guide plate is located on a side of the anti-peeping structure away from the first light guide plate, and a side of the second light guide plate away from the anti-peeping structure has a plurality of second mesh points; Among them, when the first light source is turned on and the collimated surface light source is turned on, the backlight module is in a second sharing mode, and the second sharing mode refers to a mode in which the display image of the display device is difficult to observe in other viewing angle areas except the main viewing angle area and the secondary viewing angle area; when the first light source is turned on and the collimated surface light source is turned off, the backlight module is in a first anti-peeping mode, and the first anti-peeping mode refers to a mode in which the display image of the display device is observed in the secondary viewing angle area, and the display image of the display device is difficult to observe in the main viewing angle area.

2. The backlight module according to claim 1, characterized in that: The first grid point has a first side surface in contact with the first light guide plate, and a second side surface and a third side surface connected to the first side surface, a first angle is formed between the first side surface and the second side surface, a second angle is formed between the first side surface and the third side surface, and a third angle is formed between the second side surface and the third side surface.

3. The backlight module according to claim 2, characterized in that: The width of the first side surface in the length direction of the first dot is in a range of 35 micrometers to 100 micrometers, and the width of the first side surface in a direction perpendicular to the length direction of the first dot is in a range of 20 micrometers to 100 micrometers.

4. The backlight module according to claim 2, characterized in that: The first angle has a value range of 20 degrees to 70 degrees, and the second angle is less than or equal to 20 degrees.

5. The backlight module according to claim 2, characterized in that: There is a chamfer at the third angle, the chamfer is an arc, and the radius of the arc is less than or equal to 30 microns.

6. The backlight module according to claim 5, characterized in that: The collimated surface light source further includes a second light source, which is located on the side of the second light guide plate, and the second light source and the orthographic projection of the second light guide plate on the plane where the light emitting surface of the collimated surface light source is located do not overlap.

7. The backlight module according to claim 6, characterized in that: The anti-peeping structure includes: a first substrate, and a plurality of strip-shaped first prisms located on the first substrate, wherein the plurality of first prisms are located on a side of the first substrate close to the second light guide plate.

8. The backlight module according to claim 7, characterized in that: The second light source is a strip light source, and the extension direction of the light source strip of the second light source is the same as the extension direction of the light source strip of the first light source; The length direction of the plurality of first prisms is parallel to the extending direction of the light source bar of the second light source.

9. The backlight module according to claim 8, characterized in that: The first prism is a triangular prism structure, and the first prism has a fourth side surface contacting the first substrate, and a fifth side surface and a sixth side surface connected to the fourth side surface; A fourth angle between the fourth side surface and the fifth side surface is greater than or equal to a fifth angle between the fourth side surface and the sixth side surface, and the fifth side surface of the first prism is closer to the second light source than the sixth side surface.

10. The backlight module according to claim 9, characterized in that: The fourth angle ranges from 45 degrees to 90 degrees, and the fifth angle ranges from 45 degrees to 70 degrees.

11. The backlight module according to claim 9, characterized in that: The fourth angle ranges from 60 degrees to 72 degrees, and the fifth angle ranges from 53 degrees to 57 degrees.

12. The backlight module according to claim 9, characterized in that: There is a chamfer at the sixth angle between the fifth side surface and the sixth side surface, and the chamfer is a circular arc, and the radius of the circular arc is less than or equal to 30 micrometers.

13. The backlight module according to claim 9, characterized in that: The anti-peeping structure further includes: a particle diffusion layer, the particle diffusion layer including: a transparent film layer and a plurality of particles located in the transparent film layer; The transparent film layer is the first substrate, or the transparent film layer is a film layer on a side of the first substrate away from the plurality of first prisms.

14. The backlight module according to claim 13, characterized in that: The concentration of particles in the transparent film layer ranges from 10% to 90%.

15. The backlight module according to claim 8, characterized in that: The second mesh point is a prism structure, and the length direction of the second mesh point is parallel to the extension direction of the light source bar of the second light source; The second mesh point has a seventh side surface contacting the second light guide plate, and an eighth side surface and a ninth side surface connected to the seventh side surface; A seventh angle is defined between the seventh side surface and the eighth side surface, an eighth angle is defined between the seventh side surface and the ninth side surface, and a ninth angle is defined between the eighth side surface and the ninth side surface.

16. The backlight module according to claim 15, characterized in that: The width of the seventh side in the length direction of the second mesh dots ranges from 35 micrometers to 100 micrometers, and the width of the seventh side in a direction perpendicular to the length direction of the second mesh dots ranges from 20 micrometers to 100 micrometers.

17. The backlight module according to claim 15, characterized in that: The seventh angle is greater than the eighth angle, and the eighth side surface of the second grid point is closer to the second light source than the ninth side surface.

18. The backlight module according to claim 17, characterized in that: The seventh angle has an angle range of 10 degrees to 90 degrees, and the eighth angle is less than or equal to 30 degrees.

19. The backlight module according to claim 18, characterized in that: The seventh angle is in a range of 26 to 30 degrees, and the eighth angle is less than or equal to 5 degrees.

20. The backlight module according to claim 15, characterized in that: A chamfer is provided at a ninth angle between the eighth side surface and the ninth side surface. The chamfer is a circular arc, and a radius of the circular arc is less than or equal to 30 micrometers.

21. The backlight module according to claim 20, characterized in that: The radius of the arc is less than or equal to 5 microns.

22. The backlight module according to claim 20, characterized in that: The first mesh dots and the second mesh dots have the same shape and size.

23. The backlight module according to claim 7, characterized in that: The anti-peeping structure includes: a grating structure.

24. The backlight module according to any one of claims 7 to 23, characterized in that: The collimated surface light source further includes: a reflective sheet located on a side of the second light guide plate away from the anti-peep structure.

25. The backlight module according to claim 24, characterized in that: The collimated surface light source also includes: a second substrate located between the second light guide plate and the reflective sheet, and a plurality of strip-shaped second prisms located on the second substrate, the second prisms are located on a side of the second substrate close to the second light guide plate, and the length direction of the plurality of second prisms is perpendicular to the extension direction of the light source bar of the second light source.

26. The backlight module according to claim 24, characterized in that: A side of the first light guide plate away from the plurality of first grid points has a plurality of strip-shaped third prisms, and / or a side of the second light guide plate away from the plurality of second grid points has a plurality of strip-shaped fourth prisms, and the length directions of the plurality of third prisms and the length directions of the plurality of fourth prisms are both perpendicular to the extension direction of the light source bar of the second light source.

27. The backlight module according to any one of claims 25-26, characterized in that: The backlight module further includes: a frame; the first light guide plate, the second light guide plate, the anti-peep structure, the first light source, and the second light source are all located in the frame.

28. The backlight module according to claim 27, characterized in that: The frame comprises: a back plate, the back plate having a first groove, a second groove and a third groove connected in sequence, the opening surface of the first groove is coplanar with the bottom surface of the second groove, and the opening surface of the second groove is coplanar with the bottom surface of the third groove; The reflective sheet is located in the first groove, the second light guide plate and the second light source are both located in the second groove, and the first light guide plate and the first light source are both located in the third groove.

29. The backlight module according to claim 28, characterized in that: The frame body further comprises: a plastic frame connected to the edge of the back plate, the plastic frame having a panel bearing portion, and the panel bearing portion is used to bear the display panel.

30. The backlight module according to claim 28, characterized in that: The first light source and the second light source are located on the same side of the frame, or the first light source and the second light source are located on two opposite sides of the frame.

31. A display device, characterized in that: include: A display panel and a backlight module as claimed in any one of claims 1 to 30.

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