Backlight module and display device with switchable wide and narrow viewing angles

Abstract

The application discloses a backlight module and a display device with switchable wide and narrow viewing angles. The backlight module comprises a lamp plate, a plurality of diffused light lamps and a plurality of convergent light lamps arranged on the lamp plate. The diffused light lamps can emit diffused light sources, and the convergent light lamps can emit convergent light sources. The diffused light lamp comprises a first lamp bead and a diffused light lens arranged on the light emitting side of the first lamp bead and corresponding to the first lamp bead. The diffused light lens is used for diffusing the light emitted by the first lamp bead. The convergent light lamp comprises a second lamp bead and a convergent light lens arranged on the light emitting side of the second lamp bead and corresponding to the second lamp bead. The convergent light lens is used for converging the light emitted by the second lamp bead. In the wide viewing angle mode, at least the diffused light lamp is turned on. In the narrow viewing angle mode, the convergent light lamp is turned on, and the diffused light lamp is turned off. The diffused light lamp and the convergent light lamp are controlled to be turned on or turned off respectively, so that the wide and narrow viewing angle switching is realized, the liquid crystal display panel does not need to be improved, and the box thickness and the driving power consumption of the display device are basically not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display technology, in particular to a backlight module and a display device with switchable wide and narrow viewing angles. BACKGROUND

[0002] With the continuous progress of liquid crystal display technology, the viewing angle of the display has been widened from about 112° to more than 160°. While people enjoy the visual experience brought by the wide viewing angle, they also hope to effectively protect commercial secrets and personal privacy to avoid business losses or embarrassment caused by the leakage of screen information. Therefore, in addition to the demand for wide viewing angle, the display device also needs to have the function of switching between wide and narrow viewing angles in many occasions.

[0003] Currently, the main method to achieve the switching between wide and narrow viewing angles is to attach a louver shielding film to the display screen. When privacy protection is needed, the screen can be covered by the louver shielding film to reduce the viewing angle. However, this method requires an additional louver shielding film, which causes great inconvenience to the user. Moreover, a louver shielding film can only achieve one viewing angle. Once the louver shielding film is attached, the viewing angle is fixed in the narrow viewing angle mode, which makes it impossible to freely switch between the wide and narrow viewing angle modes. In addition, the louver shielding film will cause a decrease in brightness, affecting the display effect.

[0004] In the prior art, there is also a method of using a light modulation box and a display panel to switch between wide and narrow viewing angles. The display panel is used for normal picture display, and the light modulation box is used for controlling the viewing angle switching. The light modulation box includes an upper substrate, a lower substrate, and a liquid crystal layer between the upper substrate and the lower substrate. The viewing angle control electrodes on the upper substrate and the lower substrate apply a vertical electric field to the liquid crystal molecules, causing the liquid crystal to deflect vertically and achieve the narrow viewing angle mode. By controlling the voltage on the viewing angle control electrodes, switching between wide and narrow viewing angles can be achieved. However, this display device has a relatively thick thickness, high driving power consumption, low contrast ratio, and poor color gamut, resulting in poor display effect. SUMMARY

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide a backlight module and a display device with switchable wide and narrow viewing angles, to solve the problems of thick thickness and high driving power consumption of the display device with switchable wide and narrow viewing angles in the prior art.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] The present application provides a backlight module, comprising a lamp panel and a plurality of diffused light lamps and a plurality of focused light lamps arranged on the lamp panel. The diffused light lamps can emit diffused light sources, and the focused light lamps can emit focused light sources.

[0008] The light diffusing lamp comprises first lamp beads and light diffusing lenses, the light diffusing lenses are arranged on the light emitting side of the first lamp beads and correspond to the first lamp beads one by one, and the light diffusing lenses are used for diffusing the light emitted by the first lamp beads; the spotlight comprises second lamp beads and light converging lenses, the light converging lenses are arranged on the light emitting side of the second lamp beads and correspond to the second lamp beads one by one, and the light converging lenses are used for converging the light emitted by the second lamp beads.

[0009] In the wide viewing angle mode, at least the light diffusing lamp is turned on; in the narrow viewing angle mode, the spotlight is turned on and the light diffusing lamp is turned off.

[0010] Further, the light diffusing lens is provided with a first accommodating groove on the side facing the first lamp bead, and is provided with a protrusion on the side away from the first lamp bead, and the first lamp bead is arranged in the first accommodating groove.

[0011] The light converging lens is provided with a second accommodating groove on the side facing the second lamp bead, and is provided with a light converging structure on the side away from the second lamp bead, and the second lamp bead is arranged in the second accommodating groove.

[0012] Further, the light diffusing lens is provided with a first light diffusing structure on the inner wall of the first accommodating groove, and the first light diffusing structure is arranged on the entire surface of the inner wall of the first accommodating groove.

[0013] Further, the light converging structure comprises a plurality of convex edges, and the plurality of convex edges are circular ring structures arranged in concentric circles.

[0014] Further, the light converging structure comprises a plurality of convex edges, and the plurality of convex edges are circular arc structures arranged in concentric circles, the radian of the circular arc structure is 90°, the number of the light converging structures is two and the light converging structures are symmetrically distributed on the side of the light converging lens away from the second lamp bead.

[0015] Further, the light converging lens is provided with a second light diffusing structure on the inner wall of the second accommodating groove, the second light diffusing structure is distributed in a 90° sector, and the projection of the lamp panel on the second light diffusing structure is located between the projections of the two light converging structures on the lamp panel.

[0016] Further, the spotlight comprises a mounting plate and a rotary driving base, the second lamp beads and the light converging lenses are mounted on the mounting plate, the mounting plate is mounted on the rotary driving base and can rotate on the rotary driving base, and the rotary driving base is mounted on the lamp panel.

[0017] The narrow viewing angle mode includes a first narrow viewing angle mode and a second narrow viewing angle mode, in the first narrow viewing angle mode, the rotating driving base drives the mounting plate to rotate with the condensing lens to a first anti-peeping position; in the second narrow viewing angle mode, the rotating driving base drives the mounting plate to rotate with the condensing lens to a second anti-peeping position.

[0018] Further, the lamp plate includes a plurality of first lamp strips and a plurality of second lamp strips, the scattered light lamps are all mounted on the first lamp strips, the condensing lamps are all mounted on the second lamp strips, and the number of the condensing lamps is greater than the number of the scattered light lamps.

[0019] The application also provides a display device with switchable wide and narrow viewing angles, comprising a liquid crystal display panel and the backlight module as described above.

[0020] The application also provides a display device with switchable wide and narrow viewing angles, comprising a backlight module, a liquid crystal display panel, an optical film assembly and a light adjusting box, the optical film assembly, the liquid crystal display panel and the light adjusting box are sequentially arranged on the light emitting side of the backlight module.

[0021] The optical film assembly includes a condensing film sheet, the condensing film sheet is used for converging the light emitted by the backlight module, and the light adjusting box is used for controlling the display device to switch between the wide viewing angle mode and the narrow viewing angle mode.

[0022] A plurality of condensing mechanisms are arranged on the condensing film sheet, each condensing mechanism includes a plurality of convex edges, the plurality of convex edges are arranged in a circular ring structure in a concentric circle mode, or the plurality of convex edges are arranged in a straight strip structure.

[0023] The application has the advantages that: a plurality of scattered light lamps capable of emitting scattered light sources and a plurality of condensing lamps capable of emitting converging light sources are arranged on the lamp plate of the backlight module, and the scattered light lamps and the condensing lamps are controlled to be turned on or turned off respectively, in the wide viewing angle mode, at least the scattered light lamps are controlled to be turned on; in the narrow viewing angle mode, the condensing lamps are controlled to be turned on and the scattered light lamps are controlled to be turned off. Thus, the wide and narrow viewing angle switching is realized, the liquid crystal display panel does not need to be improved, and the box thickness and the driving power consumption of the display device are basically not affected. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a longitudinal sectional structure schematic diagram of a display device in an embodiment of the application.

[0025] Figure 2 FIG. 2 is a longitudinal sectional structure schematic diagram of a display device in another embodiment of the application. Figure 1 FIG. 3 is an enlarged structure schematic diagram of A in FIG. 2.

[0026] Figure 3 FIG. 4 is a top plan structure schematic diagram of a backlight module in an embodiment of the application.

[0027] Figure 4 is a top view of the divergent lens of the first embodiment of the present application.

[0028] Figure 5 is a bottom view of the divergent lens of the first embodiment of the present application.

[0029] Figure 6 is a longitudinal sectional view of the divergent lamp of the first embodiment of the present application.

[0030] Figure 7 is a scattering principle diagram of the divergent lamp of the first embodiment of the present application.

[0031] Figure 8 is a top view of the convergent lens of the first embodiment of the present application.

[0032] Figure 9 is a bottom view of the convergent lens of the first embodiment of the present application.

[0033] Figure 10 is a longitudinal sectional view of the convergent lamp of the first embodiment of the present application.

[0034] Figure 11 is a convergent principle diagram of the convergent lamp of the first embodiment of the present application.

[0035] Figure 12 is a top view of another backlight module of the first embodiment of the present application.

[0036] Figure 13 is a simulation comparison diagram of the narrow viewing angle effect of the display device of the first embodiment of the present application and the display device of the prior art.

[0037] Figure 14 is a top view of the convergent lens of the second embodiment of the present application.

[0038] Figure 15 is a bottom view of the convergent lens of the second embodiment of the present application.

[0039] Figure 16 is a longitudinal sectional view of the convergent lamp of the third embodiment of the present application.

[0040] Figure 17 is a top view of the convergent lamp of the third embodiment of the present application.

[0041] Figure 18 is a bottom view of the convergent lamp of the third embodiment of the present application.

[0042] Figure 19 is a longitudinal sectional view of the display device of the fourth embodiment of the present application.

[0043] Figure 20 is Figure 19 is an enlarged structural schematic view of B in FIG. 10.

[0044] Figure 21 is a top planar structural schematic view of the backlight module in Embodiment Four of the present application.

[0045] Figure 22 is a light collecting principle schematic view of the light collecting mechanism in Embodiment Four of the present application. DETAILED DESCRIPTION

[0046] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purposes, the specific embodiments, structures, features and effects of the backlight module and the display device with switchable wide and narrow viewing angles according to the present application are described in detail as follows in combination with the drawings and preferred embodiments:

[0047] [Embodiment One]

[0048] Figure 1 is a longitudinal sectional structural schematic view of the display device in Embodiment One of the present application. Figure 2 is Figure 1 is an enlarged structural schematic view of A in FIG. 8. Figure 3 is a top planar structural schematic view of the backlight module in Embodiment One of the present application. Figure 4 is a top perspective structural schematic view of the diffusing lens in Embodiment One of the present application. Figure 5 is a bottom perspective structural schematic view of the diffusing lens in Embodiment One of the present application. Figure 6 is a longitudinal sectional structural schematic view of the diffusing lamp in Embodiment One of the present application. Figure 7 is a scattering principle schematic view of the diffusing lamp in Embodiment One of the present application. Figure 8 is a top perspective structural schematic view of the light collecting lens in Embodiment One of the present application. Figure 9 is a bottom perspective structural schematic view of the light collecting lens in Embodiment One of the present application. Figure 10 is a longitudinal sectional structural schematic view of the light collecting lamp in Embodiment One of the present application. Figure 11 is a light collecting principle schematic view of the light collecting lamp in Embodiment One of the present application.

[0049] As Figures 1 to 11 shown, the backlight module 10 provided by Embodiment One of the present application includes a lamp plate 11 and a plurality of diffusing lamps 12 and a plurality of light collecting lamps 13 arranged on the lamp plate 11, the diffusing lamps 12 are capable of emitting diffusing light sources, and the light collecting lamps 13 are capable of emitting light collecting light sources.

[0050] The light-diffusing lamp 12 comprises first lamp beads 121 and light-diffusing lenses 122, the light-diffusing lenses 122 are arranged on the light-emitting side of the first lamp beads 121 and correspond to the first lamp beads 121 one by one, and the light-diffusing lenses 122 are used for diffusing the light emitted by the first lamp beads 121. The spotlight 13 comprises second lamp beads 131 and light-converging lenses 132, the light-converging lenses 132 are arranged on the light-emitting side of the second lamp beads 131 and correspond to the second lamp beads 131 one by one, and the light-converging lenses 132 are used for converging the light emitted by the second lamp beads 131.

[0051] In the wide viewing angle mode, at least the light-diffusing lamp 12 is turned on, so that the backlight module 10 can emit divergent light to achieve the wide viewing angle effect; for example, only the light-diffusing lamp 12 can be turned on, or the light-diffusing lamp 12 and the spotlight 13 can be turned on at the same time to achieve the brightening effect. In the narrow viewing angle mode, the spotlight 13 is turned on and the light-diffusing lamp 12 is turned off, so that the backlight module 10 can emit collimated light to achieve the narrow viewing angle effect.

[0052] As shown in Figures 4 to 6 , the light-diffusing lens 122 is provided with a first accommodating groove 122a on the side facing the first lamp bead 121, and is provided with a convex structure 122b on the side away from the first lamp bead 121, and the first lamp bead 121 is arranged in the first accommodating groove 122a. Optionally, the light-diffusing lens 122 is provided with a first light-diffusing structure 122c on the inner wall of the first accommodating groove 122a, the first light-diffusing structure 122c is arranged on the entire inner wall of the first accommodating groove 122a, and the first light-diffusing structure 122c can diffuse the light emitted by the first lamp bead 121. The light-diffusing lens 122 is similar to a concave lens, and the first light-diffusing structure 122c is a concave-convex structure, which is similar to frosted treatment of the inner wall of the first accommodating groove 122a. Figure 7 As shown in , when the light emitted by the first lamp bead 121 passes through the light-diffusing lens 122, the light will be inclined towards the edge of the light-diffusing lens 122, achieving the diffusing effect.

[0053] As shown in Figures 8 to 10 , the light-converging lens 132 is provided with a second accommodating groove 132a on the side facing the second lamp bead 131, and is provided with a light-converging structure 132b on the side away from the second lamp bead 131, and the second lamp bead 131 is arranged in the second accommodating groove 132a. In this embodiment, the light-converging structure 132b comprises a plurality of convex ridges, and the plurality of convex ridges are circular ring structures arranged in concentric circles, i.e. the light-converging lens 132 is a Fresnel lens, so as to converge the light at the edge of the light-converging lens 132 towards the center of the light-converging lens 132, achieving the omnidirectional light collection effect, so that the display device 100 can achieve the omnidirectional narrow viewing angle effect. Figure 11 As shown in , when the light emitted by the first lamp bead 121 passes through the light-diffusing lens 122, the light will be inclined towards the edge of the light-diffusing lens 122, achieving the diffusing effect.

[0054] The following is the refractive index calculation formula, according to the refractive index formula, the curvature of the light-emitting surface structure of the condensing lens 132 can be adjusted:

[0055] It is known that SinY 2 , the refractive index N (different materials have different refractive indexes), for example, the refractive index is 1.49, and the refractive index N = SinY 2 / Sinβ 2 From the above formula, β & β' can be obtained, and the angle of the normal a can be obtained, that is, the curvature of the light-emitting surface of the condensing lens 132 can be determined according to the angle requirement.

[0056] As shown in Figure 3 , the lamp plate 11 includes a plurality of first lamp strips 111 and a plurality of second lamp strips 112, and the first lamp strips 111 and the second lamp strips 112 are arranged in parallel with each other. The light-diffusing lamps 12 are all installed on the first lamp strips 111, and the condensing lamps 13 are all installed on the second lamp strips 112. The number of the condensing lamps 13 is greater than the number of the light-diffusing lamps 12. Since the condensing lamps 13 are light sources for emitting light collection effect, in order to prevent the problem of uneven picture, the number of the condensing lamps 13 is set to be greater than the number of the light-diffusing lamps 12. In the embodiment, the first lamp strips 111 are arranged between two second lamp strips 112, and the number of the second lamp strips 112 is one more than the number of the first lamp strips 111, for example, the number of the first lamp strips 111 is five, and the number of the second lamp strips 112 is six. The number of the condensing lamps 13 on the second lamp strips 112 is greater than the number of the light-diffusing lamps 12 on the first lamp strips 111, so that the number of the condensing lamps 13 is greater than the number of the light-diffusing lamps 12, thereby preventing the problem of uneven picture. In another embodiment, Figure 12 is a top view structure schematic diagram of another backlight module in the first embodiment of the present application, as shown in Figure 12 , two first lamp strips 111 are provided between two second lamp strips 112, for example, the number of the first lamp strips 111 is five, and the number of the second lamp strips 112 is ten. The number of the condensing lamps 13 on the second lamp strips 112 is greater than the number of the light-diffusing lamps 12 on the first lamp strips 111, so that the number of the condensing lamps 13 is greater than the number of the light-diffusing lamps 12, thereby preventing the problem of uneven picture. Of course, the number of the first lamp strips 111 and the second lamp strips 112, the number of the condensing lamps 13 on the second lamp strips 112, and the number of the light-diffusing lamps 12 on the first lamp strips 111 can be adjusted according to actual needs.

[0057] As shown in Figure 1 and Figure 2As shown, the application also provides a display device 100 with switchable wide and narrow viewing angles, comprising a liquid crystal display panel 20 and a backlight module 10 as described above, the liquid crystal display panel 20 is arranged on the light emitting side of the backlight module 10, the backlight module 10 is used to provide the liquid crystal display panel 20 with a scattering light source or a collecting light source, and the liquid crystal display panel 20 is used to control the normal display of the gray scale picture. The liquid crystal display panel 20 can be in an IPS display mode, an FFS display mode, a VA display mode or a TN display mode, and the type of the liquid crystal display panel 20 can be set according to actual needs. The specific structure of the liquid crystal display panel 20 can refer to the prior art, and will not be described here.

[0058] The display device 100 comprises an optical film assembly 30 and a housing, the optical film assembly 30 is arranged between the backlight module 10 and the liquid crystal display panel 20, and the optical film assembly 30 comprises at least one of a diffusion sheet, a light splitting film, a brightness enhancement film and a prism sheet, so as to adjust the light emitted by the backlight module 10 and then emit it to the liquid crystal display panel 20, so that the brightness is more uniform. The housing comprises a back plate 41, a front frame 42 and a glue frame 43, the back plate 41 and the front frame 42 are connected to each other and form a containing cavity 401 between them, the backlight module 10 and the optical film assembly 30 are arranged in the containing cavity 401, the backlight module 10 is mounted on the bottom of the back plate 41, and the optical film assembly 30 is mounted on the back plate 41 near the opening. The liquid crystal display panel 20 is bonded to the opening of the back plate 41 by the glue frame 43 and is located between the front frame 42 and the back plate 41.

[0059] In the wide viewing angle mode, at least the light scattering lamp 12 is turned on, so that the backlight module 10 can emit divergent light, so that the display device 100 realizes the wide viewing angle effect; for example, only the light scattering lamp 12 can be turned on, or the light scattering lamp 12 and the spotlight 13 can be turned on at the same time to realize the brightening effect. In the narrow viewing angle mode, the spotlight 13 is turned on and the light scattering lamp 12 is turned off, so that the backlight module 10 can emit collimated light, so that the display device 100 realizes the narrow viewing angle effect. In the wide viewing angle mode and the narrow viewing angle mode, the liquid crystal display panel 20 is used to control the normal display of the gray scale picture, so as to realize the wide viewing angle picture display and the narrow viewing angle picture display.

[0060] Figure 13 is the simulation comparison diagram of the narrow viewing angle effect of the display device in the embodiment one and the display device in the prior art. As Figure 13 shown, it can be seen from the figure that the narrow viewing angle effect (collecting lens viewing angle curve) of the display device 100 in the application is slightly better than that (HVA viewing angle curve) of the existing display device, and under the same current, the display device in the embodiment has the advantages of high brightness and low power consumption. The one-side privacy viewing angle of the display device 100 in the application can be freely adjusted from the original 60° to 15°~45°.

[0061] [Embodiment Two]

[0062] Figure 14 is a top view structural schematic diagram of the condenser lens in Embodiment Two of the present application. Figure 15 is a bottom view structural schematic diagram of the condenser lens in Embodiment Two of the present application. As shown in Figure 14 and Figure 15 Embodiment Two of the present application provides a backlight module and a display device with switchable wide and narrow viewing angles, which is basically the same as the backlight module and the display device with switchable wide and narrow viewing angles in Embodiment One ( Figures 3 to 5 ), except that:

[0063] In the present embodiment, the condensing structure 132b includes a plurality of convex edges, which are circular arc structures arranged in concentric circles, and the radius of the circular arc structure is 90°. The number of the condensing structure 132b is two and symmetrically distributed on the side of the condenser lens 132 away from the second lamp bead 131, so that the condenser lens 132 can realize bidirectional light collection effect.

[0064] Further, the condenser lens 132 is provided with a second light dispersing structure 132c on the inner wall of the second accommodating groove 132a, and the second light dispersing structure 132c is arranged in a 90° sector. The projection of the second light dispersing structure 132c on the lamp panel 11 is located between the projections of the two condensing structures 132b on the lamp panel 11, so that the condenser lens 132 can increase the light dispersing effect in two other directions. For example, the condensing structure 132b is arranged in the left-right direction of the condenser lens 132, and the second light dispersing structure 132c is arranged in the up-down direction of the condenser lens 132, so that the spotlight 13 can emit light sources with left-right light collection and up-down light dispersion, so as to realize the narrow viewing angle effect of left-right privacy of the display device 100.

[0065] Those skilled in the art should understand that the remaining structure and working principle of the present embodiment are the same as those of Embodiment One, which will not be described here.

[0066] [Embodiment Three]

[0067] Figure 16 is a longitudinal sectional structural schematic diagram of the spotlight in Embodiment Three of the present application. Figure 17 is a top view split structural schematic diagram of the spotlight in Embodiment Three of the present application. Figure 18 is a bottom view split structural schematic diagram of the spotlight in Embodiment Three of the present application. As shown in Figures 16 to 18 Embodiment Three of the present application provides a backlight module and a display device with switchable wide and narrow viewing angles, which is basically the same as the backlight module and the display device with switchable wide and narrow viewing angles in Embodiment Two ( Figures 14 to 15 ), except that:

[0068] In the embodiment, the spotlight 13 comprises a mounting plate 133 and a rotary driving base 134, the spotlight lens 132 is provided with a second accommodating groove 132a on the side facing the second lamp bead 131, the second lamp bead 131 and the spotlight lens 132 are both mounted on the mounting plate 133, the mounting plate 133 is mounted on the rotary driving base 134 and can rotate on the rotary driving base 134, and the rotary driving base 134 is mounted on the lamp panel 11. The mounting plate 133 is driven by the rotary driving base 134 to rotate with the second lamp bead 131 and the spotlight lens 132, so that the light collecting direction of the narrow viewing angle can be adjusted. The narrow viewing angle mode comprises a first narrow viewing angle mode and a second narrow viewing angle mode, in the first narrow viewing angle mode, the rotary driving base 134 drives the mounting plate 133 to rotate with the spotlight lens 132 to a first anti-peeping position (for example, left and right anti-peeping); in the second narrow viewing angle mode, the rotary driving base 134 drives the mounting plate 133 to rotate with the spotlight lens 132 to a second anti-peeping position (for example, up and down anti-peeping).

[0069] Further, the rotary driving base 134 is provided with a rotary shaft 134a, an engaging protrusion 134b and a first contact point 134c on the side facing the mounting plate 133, the mounting plate 133 is provided with a shaft groove 133a, an engaging groove 133b and a second contact point 133c on the side facing the rotary driving base 134, the rotary shaft 134a is mounted in the shaft groove 133a, the engaging protrusion 134b is mounted in the engaging groove 133b, and the first contact point 134c cooperates with the second contact point 133c and is used for supplying power to the second lamp bead 131. The rotary driving base 134 is provided with a plurality of electrodes 134d on the side away from the mounting plate 133, two of which are used for supplying power to the rotary driving base 134 to control the rotation of the rotary shaft 134a of the rotary driving base 134, and the other two are in conductive connection with the first contact point 134c to supply power to the second lamp bead 131.

[0070] Those skilled in the art should understand that the remaining structure and working principle of the embodiment are the same as those of the first embodiment, which will not be described here.

[0071] [Embodiment four]

[0072] Figure 19 is a longitudinal sectional structure schematic diagram of a display device in the embodiment four of the application. Figure 20 is Figure 19 is an enlarged structure schematic diagram of B in the above figure. Figure 21 is a top plane structure schematic diagram of a backlight module in the embodiment four of the application. As Figures 19 to 21As shown, the application also provides a display device 100 with switchable wide and narrow viewing angles, comprising a backlight module 10, a liquid crystal display panel 20, an optical film assembly 30, and a light modulation box 50. The optical film assembly 30, the liquid crystal display panel 20, and the light modulation box 50 are sequentially arranged on the light emitting side of the backlight module 10. The backlight module 10 is used to provide a scattering light source for the liquid crystal display panel 20. The liquid crystal display panel 20 is used to control the normal display of the gray scale picture. The optical film assembly 30 is used to adjust the light emitted by the backlight module 10 and then emit it to the liquid crystal display panel 20. The light modulation box 50 is used to control the switching between the wide viewing angle mode and the narrow viewing angle mode of the display device 100. The liquid crystal display panel 20 can be in an IPS display mode, an FFS display mode, a VA display mode, or a TN display mode. The type of the liquid crystal display panel 20 can be set according to actual needs. The light modulation box 50 can be a conventional liquid crystal box that can realize the switching between the wide and narrow viewing angles, or a polymer liquid crystal box (PDLC) that can realize the switching between the wide and narrow viewing angles. The specific structure of the liquid crystal display panel 20 and the light modulation box 50 can refer to the prior art, which will not be described here.

[0073] In this embodiment, the backlight module 10 comprises a lamp plate 11 and a plurality of scattering lamps 12 arranged on the lamp plate 11. The scattering lamps 12 can emit a scattering light source. The specific structure of the scattering lamps 12 can refer to Embodiment One of the application, and the backlight module 10 can also use a conventional backlight module 10 with scattering effect in the prior art.

[0074] In this embodiment, the optical film assembly 30 comprises a condensing film 31, which is used to converge the light emitted by the backlight module 10. Optionally, the condensing film 31 is provided with a plurality of condensing mechanisms 311. Each condensing mechanism 311 comprises a plurality of convex ridges in a straight strip structure. For example, the convex ridges extend in the up-down direction to achieve the light collection effect in the left-right direction. Of course, the convex ridges extend in the left-right direction to achieve the light collection effect in the up-down direction. Figure 22 is a schematic diagram of the condensing principle of the condensing mechanism in Embodiment Four of the application, as Figure 22 As shown, when the light emitted by the backlight module 10 passes through the condensing film 31, the light will be inclined towards the middle of the condensing mechanism 311 to achieve the light collection effect. Of course, in other embodiments, the plurality of convex ridges are in a circular ring structure arranged in concentric circles, i.e., the condensing mechanism 311 is a Fresnel lens, so that the light at the edge of the condensing mechanism 311 is converged towards the center of the condensing mechanism 311 to achieve the omnidirectional light collection effect, so that the display device 100 can achieve the omnidirectional narrow viewing angle effect. The light emitted by the backlight module 10 is adjusted to be a collimated light source through the condensing film 31, and then the wide and narrow viewing angle switching effect of the light modulation box 50 is combined, so that a better narrow viewing angle effect can be achieved.

[0075] Further, the optical film assembly 30 can further include at least one of a diffusion sheet, a light splitting film, a brightness enhancement film, and a prism sheet, so as to adjust the light emitted by the backlight module 10 to the liquid crystal display panel 20, so that the brightness is more uniform.

[0076] The display device 100 includes the optical film assembly 30 and a housing. The optical film assembly 30 is disposed between the backlight module 10 and the liquid crystal display panel 20. The housing includes a back plate 41, a front frame 42, and a glue frame 43. The back plate 41 and the front frame 42 are connected to each other and form a receiving cavity 401 between the back plate 41 and the front frame 42. The backlight module 10 and the optical film assembly 30 are disposed in the receiving cavity 401. The backlight module 10 is mounted on the bottom of the back plate 41, and the optical film assembly 30 is mounted on the back plate 41 near the opening. The liquid crystal display panel 20 and the light adjustment box 50 are bonded to the opening of the back plate 41 by the glue frame 43 and are located between the front frame 42 and the back plate 41.

[0077] In this document, the terms "upper", "lower", "left", "right", "front", "back", etc. are defined according to the position of the structure in the drawing and the position of the structure relative to each other, only for the purpose of expressing the technical solution clearly and conveniently. It should be understood that the use of the terms should not limit the scope of the application. It should also be understood that the terms "first" and "second" used herein are only used for name distinction, and do not limit the quantity and order.

[0078] The above is only the preferred embodiment of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and the equivalent embodiments of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, all within the scope of protection of the present application.

Claims

1. A backlight module, characterized in that, It includes a light panel (11) and a plurality of diffused lights (12) and a plurality of spotlights (13) disposed on the light panel (11). The diffused lights (12) are capable of emitting diffused light sources, and the spotlights (13) are capable of emitting light-receiving light sources. The diffuser (12) includes a first LED (121) and a diffuser lens (122). The diffuser lens (122) is disposed on the light-emitting side of the first LED (121) and corresponds one-to-one with the first LED (121). The diffuser lens (122) is used to scatter the light emitted by the first LED (121). The spotlight (13) includes a second LED (131) and a spotlight lens (132). The spotlight lens (132) is disposed on the light-emitting side of the second LED (131) and corresponds one-to-one with the second LED (131). The spotlight lens (132) is used to converge the light emitted by the second LED (131). The astigmatic lens (122) has a first receiving groove (122a) on the side facing the first lamp bead (121), and a protrusion (122b) is provided on the side of the astigmatic lens (122) away from the first lamp bead (121). The first lamp bead (121) is disposed in the first receiving groove (122a). The condensing lens (132) has a second receiving groove (132a) on the side facing the second lamp bead (131), and a condensing structure (132b) is provided on the side of the condensing lens (132) away from the second lamp bead (131). The second lamp bead (131) is disposed in the second receiving groove (132a). The light-concentrating structure (132b) includes multiple protruding ridges, which are concentric arc-shaped structures with an arc of 90°. The number of light-concentrating structures (132b) is two, and they are symmetrically distributed on the side of the light-concentrating lens (132) away from the second lamp bead (131). In wide-view mode, at least the diffuser (12) is turned on; in narrow-view mode, the spotlight (13) is turned on and the diffuser (12) is turned off.

2. The backlight module according to claim 1, characterized in that, The astigmatic lens (122) has a first astigmatic structure (122c) on the inner wall of the first receiving groove (122a), and the first astigmatic structure (122c) is disposed on the entire inner wall of the first receiving groove (122a).

3. The backlight module according to claim 1, characterized in that, The condensing lens (132) has a second diffusing structure (132c) on the inner wall of the second receiving groove (132a). The second diffusing structure (132c) is distributed in a 90° fan shape. The projection of the second diffusing structure (132c) on the lamp panel (11) is located between the projections of the two condensing structures (132b) on the lamp panel (11).

4. The backlight module according to claim 1, characterized in that, The spotlight (13) includes a mounting plate (133) and a rotating drive base (134). The second lamp bead (131) and the focusing lens (132) are both mounted on the mounting plate (133). The mounting plate (133) is mounted on the rotating drive base (134) and can rotate on the rotating drive base (134). The rotating drive base (134) is mounted on the lamp plate (11). The narrow viewing angle mode includes a first narrow viewing angle mode and a second narrow viewing angle mode. In the first narrow viewing angle mode, the rotating drive base (134) drives the mounting plate (133) to rotate with the condenser lens (132) to the first privacy position. In the second narrow viewing angle mode, the rotating drive base (134) drives the mounting plate (133) to rotate with the condenser lens (132) to the second privacy position.

5. The backlight module according to any one of claims 1-4, characterized in that, The light panel (11) includes a plurality of first light strips (111) and a plurality of second light strips (112). The diffuser (12) is installed on the first light strip (111), and the spotlight (13) is installed on the second light strip (112). The number of spotlights (13) is greater than the number of diffuser (12).

6. A display device with switchable wide and narrow viewing angles, characterized in that, It includes a liquid crystal display panel (20) and a backlight module (10) as described in any one of claims 1-5.

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