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

Abstract

The invention discloses a backlight module and a display device with switchable wide and narrow visual angles, the backlight module comprises a lamp panel, a plurality of floodlights and a plurality of spotlights, the floodlights and the spotlights are arranged on the lamp panel, the floodlights can emit scattering light sources, and the spotlights can emit receiving light sources; the light diffusing lamp comprises first lamp beads and light diffusing lenses, the light diffusing lenses are arranged on the light emitting sides of the first lamp beads and correspond to the first lamp beads one to one, and the light diffusing lenses are used for diffusing light emitted by the first lamp beads; the spotlight comprises second lamp beads and condensing lenses, the condensing lenses are arranged on the light emitting sides of the second lamp beads and correspond to the second lamp beads one to one, and the condensing lenses are used for converging light emitted by the second lamp beads; in the wide viewing angle mode, the floodlight is at least turned on; and in the narrow viewing angle mode, the spotlight is turned on, and the floodlight is turned off. According to the technical scheme, the floodlight and the spotlight are respectively controlled to be turned on or turned off, so that wide-narrow visual angle switching is realized, a liquid crystal display panel does not need to be improved, and the box thickness and driving power consumption of the display device are basically not influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of displays, and in particular to a backlight module and a display device with switchable wide and narrow viewing angles. Background Art

[0002] With the continuous advancement of liquid crystal display technology, the viewing angle of the display has been widened from the original 112° to more than 160°. While enjoying the visual experience brought by the wide viewing angle, people also hope to effectively protect business 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, in many occasions, the display device is also required to have the function of switching between wide and narrow viewing angles.

[0003] Currently, the main method is to attach a louver film to the display screen to achieve switching between wide and narrow viewing angles. When anti-peeping is needed, the screen can be covered with a louver film to narrow the viewing angle. However, this method requires additional louver film, which will cause great inconvenience to the user. Moreover, a louver film can only achieve one viewing angle. Once the louver film is attached, the viewing angle is fixed in the narrow viewing angle mode, resulting in the inability to switch freely between the wide viewing angle mode and the narrow viewing angle mode. In addition, the anti-peeping film will reduce the brightness and affect the display effect.

[0004] In the prior art, there are also devices that use dimming boxes and display panels to switch between wide and narrow viewing angles. The display panel is used for normal picture display, and the dimming box is used to control the viewing angle switching. The dimming box includes an upper substrate, a lower substrate, and a liquid crystal layer between the upper and lower substrates. The viewing angle control electrodes on the upper and lower substrates apply a vertical electric field to the liquid crystal molecules to deflect the liquid crystal in the vertical direction to achieve a narrow viewing angle mode. By controlling the voltage on the viewing angle control electrode, switching between wide and narrow viewing angles can be achieved. This display device is not only thicker and has higher driving power consumption, but also has lower contrast and color gamut, and a poorer display effect. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a backlight module and a display device with switchable wide and narrow viewing angles, so as to solve the problems of thick box 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 invention is achieved through the following technical solutions: The present invention provides a backlight module, comprising a light board and a plurality of scattered light lamps and a plurality of spotlights arranged on the light board, wherein the scattered light lamps can emit scattered light sources, and the spotlights can emit collected light sources; The diffuser lamp comprises a first lamp bead and a diffuser lens, wherein the diffuser lens is arranged at the light-emitting side of the first lamp bead and corresponds to the first lamp bead one-to-one, and is used to scatter the light emitted by the first lamp bead; the spotlight comprises a second lamp bead and a condenser lens, wherein the condenser lens is arranged at the light-emitting side of the second lamp bead and corresponds to the second lamp bead one-to-one, and is used to condense the light emitted by the second lamp bead; In the wide viewing angle mode, at least the diffuser light is turned on; in the narrow viewing angle mode, the spotlight is turned on and the diffuser light is turned off.

[0007] Furthermore, a first receiving groove is provided on a side of the diffusing lens facing the first lamp bead, a protrusion is provided on a side of the diffusing lens away from the first lamp bead, and the first lamp bead is arranged in the first receiving groove; A second accommodating groove is provided on a side of the condensing lens facing the second lamp bead, a condensing structure is provided on a side of the condensing lens away from the second lamp bead, and the second lamp bead is arranged in the second accommodating groove.

[0008] Furthermore, the astigmatism lens is provided with a first astigmatism structure on the inner wall of the first receiving groove, and the first astigmatism structure is entirely arranged on the inner wall of the first receiving groove.

[0009] Furthermore, the light-focusing structure includes a plurality of convex ridges, and the plurality of convex ridges are in a circular ring structure arranged in concentric circles.

[0010] Furthermore, the focusing structure includes a plurality of ridges, and the plurality of ridges are arc-shaped structures arranged in concentric circles, and the arc of the arc-shaped structure is 90°. The number of the focusing structures is two and they are symmetrically distributed on the side of the focusing lens away from the second lamp bead.

[0011] Furthermore, the focusing lens is provided with a second light-scattering structure on the inner wall of the second accommodating groove, the second light-scattering structure is distributed in a 90° fan-shaped manner, and the projection of the second light-scattering structure on the light board is located between the projections of the two focusing structures on the light board.

[0012] Further, the spotlight comprises a mounting plate and a rotating driving base, the second lamp bead and the focusing lens are both mounted on the mounting plate, the mounting plate is mounted on the rotating driving base and can rotate on the rotating driving base, and the rotating driving base is mounted on the lamp board; 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 focusing 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 focusing lens to a second anti-peeping position.

[0013] Furthermore, the light panel includes a plurality of first light strips and a plurality of second light strips, the diffuser lamps are all mounted on the first light strips, the spotlights are all mounted on the second light strips, and the number of the spotlights is greater than the number of the diffuser lamps.

[0014] The present 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.

[0015] The present 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 dimming box, wherein the optical film assembly, the liquid crystal display panel and the dimming box are sequentially arranged on the light-emitting side of the backlight module; The optical film assembly includes a light-gathering film sheet, and the light-gathering film sheet is used to gather the light emitted by the backlight module, and the dimming box is used to control the display device to switch between a wide viewing angle mode and a narrow viewing angle mode; The focusing film is provided with a plurality of focusing mechanisms, each of which comprises a plurality of convex ridges, wherein the plurality of convex ridges are circular ring structures arranged in concentric circles, or the plurality of convex ridges are straight strip structures.

[0016] The beneficial effect of the present invention is that by arranging a plurality of diffuser lamps capable of emitting diffuse light sources and a plurality of spotlights capable of emitting collected light sources on the lamp panel of the backlight module, and controlling the diffuser lamps and the spotlights to be turned on or off respectively, in the wide viewing angle mode, at least the diffuser lamps are controlled to be turned on; in the narrow viewing angle mode, the spotlights are controlled to be turned on and the diffuser lamps are controlled to be turned off. Thus, the wide and narrow viewing angle switching is realized without improving the liquid crystal display panel, and the box thickness and driving power consumption of the display device are basically not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the longitudinal cross-section structure of the display device in the first embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0019] Figure 3 It is a schematic diagram of the top plan structure of the backlight module in the first embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the top three-dimensional structure of the astigmatism lens in the first embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of the upward-looking three-dimensional structure of the astigmatism lens in the first embodiment of the present invention.

[0022] Figure 6It is a schematic diagram of the longitudinal cross-section structure of the diffuser lamp in the first embodiment of the present invention.

[0023] Figure 7 It is a schematic diagram of the scattering principle of the diffuser lamp in the first embodiment of the present invention.

[0024] Figure 8 It is a schematic diagram of the top view of the three-dimensional structure of the focusing lens in the first embodiment of the present invention.

[0025] Fig. 9 It is a schematic diagram of the upward-looking three-dimensional structure of the focusing lens in the first embodiment of the present invention.

[0026] Fig.10 It is a schematic diagram of the longitudinal cross-section structure of the spotlight in the first embodiment of the present invention.

[0027] Fig.11 It is a schematic diagram of the focusing principle of the spotlight in the first embodiment of the present invention.

[0028] Fig.12 It is a schematic diagram of a top plan structure of another backlight module in the first embodiment of the present invention.

[0029] Fig.13 It is a simulation comparison diagram of the narrow viewing angle effect of the display device in the first embodiment of the present invention and the display device in the prior art.

[0030] Fig.14 It is a schematic diagram of the top view of the three-dimensional structure of the focusing lens in the second embodiment of the present invention.

[0031] Fig.15 It is a schematic diagram of the upward-looking three-dimensional structure of the focusing lens in the second embodiment of the present invention.

[0032] Fig.16 It is a schematic diagram of the longitudinal cross-section structure of the spotlight in the third embodiment of the present invention.

[0033] Fig.17 It is a schematic diagram of the split structure of the spotlight in the third embodiment of the present invention from a top view.

[0034] Fig.18 It is a schematic diagram of the upward-view split structure of the spotlight in the third embodiment of the present invention.

[0035] Fig.19 It is a schematic diagram of the longitudinal cross-section structure of the display device in the fourth embodiment of the present invention.

[0036] Fig. 20 yes Fig.19 Schematic diagram of the enlarged structure at point B in the middle.

[0037] Fig.21 It is a schematic diagram of the top plan structure of the backlight module in the fourth embodiment of the present invention.

[0038] Fig. 22 It is a schematic diagram of the focusing principle of the focusing mechanism in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the backlight module and the display device with switchable wide and narrow viewing angles proposed by the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments: [Example 1] Figure 1 It is a schematic diagram of the longitudinal cross-section structure of the display device in the first embodiment of the present invention. Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle. Figure 3 It is a schematic diagram of the top plan structure of the backlight module in the first embodiment of the present invention. Figure 4 It is a schematic diagram of the top three-dimensional structure of the astigmatism lens in the first embodiment of the present invention. Figure 5 It is a schematic diagram of the upward-looking three-dimensional structure of the astigmatism lens in the first embodiment of the present invention. Figure 6 It is a schematic diagram of the longitudinal cross-section structure of the diffuser lamp in the first embodiment of the present invention. Figure 7 It is a schematic diagram of the scattering principle of the diffuser lamp in the first embodiment of the present invention. Figure 8 It is a schematic diagram of the top view of the three-dimensional structure of the focusing lens in the first embodiment of the present invention. Fig. 9 It is a schematic diagram of the upward-looking three-dimensional structure of the focusing lens in the first embodiment of the present invention. Fig.10 It is a schematic diagram of the longitudinal cross-section structure of the spotlight in the first embodiment of the present invention. Fig.11 It is a schematic diagram of the focusing principle of the spotlight in the first embodiment of the present invention.

[0040] like Figures 1 to 11 As shown, a backlight module 10 provided in the first embodiment of the present invention includes a light board 11 and a plurality of diffuser lamps 12 and a plurality of spotlights 13 arranged on the light board 11. The diffuser lamps 12 can emit scattered light sources, and the spotlights 13 can emit collected light sources.

[0041] The diffuser lamp 12 includes a first lamp bead 121 and a diffuser lens 122. The diffuser lens 122 is disposed on the light-emitting side of the first lamp bead 121 and corresponds to the first lamp bead 121 one by one. The diffuser lens 122 is used to scatter the light emitted by the first lamp bead 121. The spotlight 13 includes a second lamp bead 131 and a condenser lens 132. The condenser lens 132 is disposed on the light-emitting side of the second lamp bead 131 and corresponds to the second lamp bead 131 one by one. The condenser lens 132 is used to converge the light emitted by the second lamp bead 131.

[0042] In the wide viewing angle mode, at least the diffuser 12 is turned on, so that the backlight module 10 can emit diffuse light to achieve a wide viewing angle effect; for example, only the diffuser 12 can be turned on, or the diffuser 12 and the spotlight 13 can be turned on at the same time to achieve a brightening effect. In the narrow viewing angle mode, the spotlight 13 is turned on and the diffuser 12 is turned off, so that the backlight module 10 can emit collimated light to achieve a narrow viewing angle effect.

[0043] like Figures 4 to 6 As shown, the astigmatism lens 122 is provided with 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 astigmatism lens 122 away from the first lamp bead 121, and the first lamp bead 121 is arranged in the first receiving groove 122a. Optionally, the astigmatism lens 122 is provided with a first astigmatism structure 122c on the inner wall of the first receiving groove 122a, and the first astigmatism structure 122c is arranged on the inner wall of the first receiving groove 122a in its entirety, and the first astigmatism structure 122c can scatter the light emitted by the first lamp bead 121. Among them, the astigmatism lens 122 is similar to a concave lens, and the first astigmatism structure 122c is an uneven structure, similar to frosting and atomizing the inner wall of the first receiving groove 122a. As shown in FIG. Figure 7 As shown, when the light emitted by the first lamp bead 121 passes through the diffusing lens 122 , the light will tilt toward the edge of the diffusing lens 122 to achieve a scattering effect.

[0044] like Figures 8 to 10 As shown, the side of the focusing lens 132 facing the second lamp bead 131 is provided with a second receiving groove 132a, and the side of the focusing lens 132 away from the second lamp bead 131 is provided with a focusing structure 132b, and the second lamp bead 131 is arranged in the second receiving groove 132a. In this embodiment, the focusing structure 132b includes a plurality of convex ridges, and the plurality of convex ridges are circular ring structures arranged in concentric circles, that is, the focusing lens 132 is a Fresnel lens, so that the light at the edge of the focusing lens 132 is converged toward the center of the focusing lens 132, achieving an all-round light collection effect, so that the display device 100 can achieve an all-round narrow viewing angle effect. Fig.11 As shown, when the light emitted by the second lamp bead 131 passes through the condensing lens 132 , the light will tilt toward the center of the condensing lens 132 to achieve a light collecting effect.

[0045] The following is a refractive index calculation formula, according to which the curvature of the light-emitting surface structure of the focusing lens 132 can be adjusted: Known: SinY 2 , 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, β&β' can be obtained from the above formula, thereby obtaining the angle of the normal a, and the curvature of the light-emitting surface of the focusing lens 132 can be determined according to the angle requirements.

[0046] like Figure 3 As shown, the light board 11 includes a plurality of first light bars 111 and a plurality of second light bars 112, and the first light bars 111 and the second light bars 112 are arranged parallel to each other. The scattered light lamps 12 are all installed on the first light bar 111, and the spotlights 13 are all installed on the second light bar 112, and the number of the spotlights 13 is greater than the number of the scattered light lamps 12. Since the spotlights 13 are light sources that emit a light-collecting effect, in order to prevent the problem of uneven picture, the number of spotlights 13 is set to be greater than the number of scattered light lamps 12. In this embodiment, the first light bar 111 is arranged between two second light bars 112, and the number of the second light bars 112 is one more than the number of the first light bars 111. For example, the number of the first light bars 111 is 5, and the number of the second light bars 112 is 6. The number of the spotlights 13 on the second light bar 112 is greater than the number of the scattered light lamps 12 on the first light bar 111, so that the number of the spotlights 13 is greater than the number of the scattered light lamps 12, thereby preventing the problem of uneven picture. In another embodiment, Fig.12 FIG. 1 is a schematic diagram of a top plan structure of another backlight module in the first embodiment of the present invention. Fig.12 As shown, two second light bars 112 are arranged between the two first light bars 111. For example, the number of the first light bars 111 is 5, and the number of the second light bars 112 is 10. The number of the spotlights 13 on the second light bar 112 is greater than the number of the diffuser lights 12 on the first light bar 111, so that the number of the spotlights 13 is greater than the number of the diffuser lights 12, thereby preventing the problem of uneven images. Of course, the number of the first light bar 111 and the second light bar 112, the number of the spotlights 13 on the second light bar 112, and the number of the diffuser lights 12 on the first light bar 111 can all be adjusted according to actual needs.

[0047] like Figure 1 and Figure 2 As shown, the present application also provides a display device 100 with switchable wide and narrow viewing angles, including a liquid crystal display panel 20 and the backlight module 10 as described above, wherein the liquid crystal display panel 20 is arranged on the light-emitting side of the backlight module 10, and the backlight module 10 is used to provide a scattered light source or a light-collecting light source to the liquid crystal display panel 20, and the liquid crystal display panel 20 is used to control the normal display of the grayscale picture. Among them, the liquid crystal display panel 20 can be 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 repeated here.

[0048] The display device 100 includes 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. The optical film assembly 30 includes at least one of a diffuser, a beam splitter, a brightness enhancement film and a prism sheet, so as to adjust the optical 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 includes a back plate 41, a front frame 42 and a plastic 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 both arranged in the receiving cavity 401. The backlight module 10 is installed at the bottom of the back plate 41, and the optical film assembly 30 is installed at a position close to the opening of the back plate 41. The liquid crystal display panel 20 is bonded to the opening of the back plate 41 through the plastic frame 43 and is located between the front frame 42 and the back plate 41.

[0049] In the wide viewing angle mode, at least the diffuser 12 is turned on, so that the backlight module 10 can emit diffuse light, so that the display device 100 can achieve a wide viewing angle effect; for example, only the diffuser 12 can be turned on, or the diffuser 12 and the spotlight 13 can be turned on at the same time to achieve a brightening effect. In the narrow viewing angle mode, the spotlight 13 is turned on and the diffuser 12 is turned off, so that the backlight module 10 can emit collimated light, so that the display device 100 can achieve a 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 grayscale picture, so as to achieve wide viewing angle picture display and narrow viewing angle picture display.

[0050] Fig.13 2 is a simulation comparison diagram of the narrow viewing angle effect of the display device in the first embodiment of the present invention and the display device in the prior art. Fig.13 As shown in the figure, it can be seen that the narrow viewing angle effect (light-collecting lens viewing angle curve) of the display device 100 in the present application is slightly better than the narrow viewing angle effect (HVA viewing angle curve) of the existing display device. Under the same current, the display device of this embodiment has the advantages of high brightness and low power consumption. The single-sided anti-peeping viewing angle of the display device 100 in the present application can be reduced from the original 60° to 15°~45° and adjusted freely.

[0051] [Example 2] Fig.14 It is a schematic diagram of the top view of the three-dimensional structure of the focusing lens in the second embodiment of the present invention. Fig.15 Schematic diagram of the upward-looking three-dimensional structure of the focusing lens in the second embodiment of the present invention. Fig.14 and Fig.15 As shown, the backlight module and the display device with switchable wide and narrow viewing angles provided in the second embodiment of the present invention are similar to those in the first embodiment ( Figures 3 to 5 ) are basically the same as the backlight module and the display device with switchable wide and narrow viewing angles, except that: In this embodiment, the focusing structure 132b includes a plurality of ridges, which are arc-shaped structures arranged in concentric circles. The arc of the arc-shaped structure is 90°. There are two focusing structures 132b, which are symmetrically distributed on the side of the focusing lens 132 away from the second lamp bead 131, so that the focusing lens 132 can achieve a two-way light collecting effect.

[0052] Furthermore, the condenser lens 132 is provided with a second light-scattering structure 132c on the inner wall of the second receiving groove 132a, and the second light-scattering structure 132c is distributed in a 90° fan shape, and the projection of the second light-scattering structure 132c on the light board 11 is located between the projections of the two condenser structures 132b on the light board 11, so that the condenser lens 132 can increase the light-scattering effect in the other two directions. For example, the condenser structure 132b is arranged in the left and right directions of the condenser lens 132, and the second light-scattering structure 132c is arranged in the upper and lower directions of the condenser lens 132, so that the spotlight 13 can emit a light source for collecting light left and right and a light source for scattering light up and down, so that the display device 100 can achieve a narrow viewing angle effect of left and right anti-peeping.

[0053] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0054] [Example 3] Fig.16 It is a schematic diagram of the longitudinal cross-section structure of the spotlight in the third embodiment of the present invention. Fig.17 It is a schematic diagram of the split structure of the spotlight in the third embodiment of the present invention from a top view. Fig.18 Schematic diagram of the upward split structure of the spotlight in the third embodiment of the present invention. Figures 16 to 18 As shown, the backlight module and the display device with switchable wide and narrow viewing angles provided in the third embodiment of the present invention are similar to those in the second embodiment ( Figure 14 to Figure 15 ) are basically the same as the backlight module and the display device with switchable wide and narrow viewing angles, except that: In this embodiment, the spotlight 13 includes a mounting plate 133 and a rotating driving base 134, a second receiving groove 132a is provided on the side of the focusing lens 132 facing the second lamp bead 131, 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 driving base 134 and can rotate on the rotating driving base 134, and the rotating driving base 134 is mounted on the lamp board 11. The mounting plate 133 is driven to rotate with the second lamp bead 131 and the focusing lens 132 by the rotating driving base 134, so that the light receiving direction of the narrow viewing angle can be adjusted. Among them, 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 134 drives the mounting plate 133 to rotate with the focusing lens 132 to the first anti-peeping position (for example, left and right anti-peeping); in the second narrow viewing angle mode, the rotating driving base 134 drives the mounting plate 133 to rotate with the focusing lens 132 to the second anti-peeping position (for example, up and down anti-peeping).

[0055] Further, the rotating driving base 134 is provided with a rotating shaft 134a, a clamping protrusion 134b and a first contact point 134c on the side facing the mounting plate 133, and the mounting plate 133 is provided with an axis groove 133a, a clamping groove 133b and a second contact point 133c on the side facing the rotating driving base 134, the rotating shaft 134a is installed in the axis groove 133a, the clamping protrusion 134b is installed in the clamping groove 133b, and the first contact point 134c cooperates with the second contact point 133c and is used to supply power to the second lamp bead 131. The rotating driving base 134 is provided with a plurality of electrodes 134d on the side away from the mounting plate 133, wherein two electrodes 134d are used to supply power to the rotating driving base 134 to control the rotation of the rotating shaft 134a of the rotating driving base 134; and the other two electrodes 134d are conductively connected to the first contact point 134c to supply power to the second lamp bead 131.

[0056] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0057] [Example 4] Fig.19 It is a schematic diagram of the longitudinal cross-section structure of the display device in the fourth embodiment of the present invention. Fig. 20 yes Fig.19 Schematic diagram of the enlarged structure at point B in the middle. Fig.21 Schematic diagram of the top plan structure of the backlight module in the fourth embodiment of the present invention. Figures 19 to 21As shown, the present application also provides a display device 100 with a switchable wide and narrow viewing angle, including a backlight module 10, a liquid crystal display panel 20, an optical film assembly 30 and a dimming box 50, wherein the optical film assembly 30, the liquid crystal display panel 20 and the dimming box 50 are sequentially arranged on the light-emitting side of the backlight module 10. The backlight module 10 is used to provide a scattered light source to the liquid crystal display panel 20, the liquid crystal display panel 20 is used to control the normal display of the grayscale 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, and the dimming box 50 is used to control the display device 100 to switch between a wide viewing angle mode and a narrow viewing angle mode. Among them, the liquid crystal display panel 20 can be 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 dimming box 50 can adopt a conventional liquid crystal box that can realize wide and narrow viewing angle switching, or a polymer liquid crystal box (PDLC) that can realize wide and narrow viewing angle switching. The specific structures of the liquid crystal display panel 20 and the dimming box 50 can refer to the prior art and will not be described in detail here.

[0058] In this embodiment, the backlight module 10 includes a lamp board 11 and a plurality of diffuser lamps 12 disposed on the lamp board 11. The diffuser lamps 12 can emit diffuse light. The specific structure of the diffuser lamps 12 can refer to the first embodiment of the present application. The backlight module 10 can also adopt a conventional diffuser backlight module 10 in the prior art.

[0059] In this embodiment, the optical film assembly 30 includes a light-gathering film 31, and the light-gathering film 31 is used to gather the light emitted by the backlight module 10. Optionally, a plurality of light-gathering mechanisms 311 are provided on the light-gathering film 31, and each light-gathering mechanism 311 includes a plurality of convex ridges, and the plurality of convex ridges are straight strip structures. For example, if the plurality of convex ridges extend in the up-down direction, the light-gathering effect in the left-right direction can be achieved; of course, if the plurality of convex ridges extend in the left-right direction, the light-gathering effect in the up-down direction can be achieved. Fig. 22 FIG. 1 is a schematic diagram of the focusing principle of the focusing mechanism in the fourth embodiment of the present invention. Fig. 22 As shown, when the light emitted by the backlight module 10 passes through the focusing film 31, the light will tilt toward the middle of the focusing mechanism 311 to achieve a light collecting effect. Of course, in other embodiments, the multiple ridges are annular structures arranged in concentric circles, that is, the focusing mechanism 311 is a Fresnel lens, so that the light at the edge of the focusing mechanism 311 is converged toward the center of the focusing mechanism 311 to achieve an all-round light collecting effect, so that the display device 100 can achieve an all-round narrow viewing angle effect. The light emitted by the backlight module 10 is adjusted to a collimated light source through the focusing film 31, and then combined with the wide and narrow viewing angle switching effect of the dimming box 50, a better narrow viewing angle effect can be achieved.

[0060] Furthermore, the optical film assembly 30 may also include at least one of a diffuser, a beam splitter, 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.

[0061] The display device 100 includes an 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 plastic 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 both disposed in the receiving cavity 401. The backlight module 10 is mounted at the bottom of the back plate 41, and the optical film assembly 30 is mounted at a position close to the opening of the back plate 41. The liquid crystal display panel 20 and the dimming box 50 are bonded to the opening of the back plate 41 through the plastic frame 43 and are located between the front frame 42 and the back plate 41.

[0062] In this document, the directional words such as up, down, left, right, front, and back are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second" used in this document are only used to distinguish names and are not used to limit quantity and order.

[0063] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A backlight module, characterized in that: It comprises a light board (11) and a plurality of scattered light lamps (12) and a plurality of spotlights (13) arranged on the light board (11), wherein the scattered light lamps (12) can emit scattered light sources, and the spotlights (13) can emit collected light sources; The diffuser lamp (12) comprises a first lamp bead (121) and a diffuser lens (122); the diffuser lens (122) is arranged on the light-emitting side of the first lamp bead (121) and corresponds one-to-one with the first lamp bead (121); the diffuser lens (122) is used to scatter the light emitted by the first lamp bead (121); the spotlight (13) comprises a second lamp bead (131) and a condenser lens (132); the condenser lens (132) is arranged on the light-emitting side of the second lamp bead (131) and corresponds one-to-one with the second lamp bead (131); the condenser lens (132) is used to condense the light emitted by the second lamp bead (131); In the wide viewing angle mode, at least the diffuser light (12) is turned on; in the narrow viewing angle mode, the spotlight (13) is turned on, and the diffuser light (12) is turned off.

2. The backlight module according to claim 1, characterized in that: A first accommodating groove (122a) is provided on the side of the diffusing lens (122) facing the first lamp bead (121), a protrusion (122b) is provided on the side of the diffusing lens (122) away from the first lamp bead (121), and the first lamp bead (121) is arranged in the first accommodating groove (122a); A second accommodating groove (132a) is provided on the side of the condenser lens (132) facing the second lamp bead (131), a condenser structure (132b) is provided on the side of the condenser lens (132) away from the second lamp bead (131), and the second lamp bead (131) is arranged in the second accommodating groove (132a).

3. The backlight module according to claim 2, characterized in that: The astigmatism lens (122) is provided with a first astigmatism structure (122c) on the inner wall of the first receiving groove (122a); the first astigmatism structure (122c) is entirely arranged on the inner wall of the first receiving groove (122a).

4. The backlight module according to claim 2, characterized in that: The light-focusing structure (132b) comprises a plurality of convex ridges, and the plurality of convex ridges are in the form of a circular ring structure arranged in concentric circles.

5. The backlight module according to claim 2, characterized in that: The light-concentrating structure (132b) comprises a plurality of convex ridges, the plurality of convex ridges are arc-shaped structures arranged in concentric circles, the arc of the arc-shaped structure is 90°, and the number of the light-concentrating structures (132b) is two and they are symmetrically distributed on a side of the light-concentrating lens (132) away from the second lamp bead (131).

6. The backlight module according to claim 5, characterized in that: The condensing lens (132) is provided with a second light-scattering structure (132c) on the inner wall of the second receiving groove (132a); the second light-scattering structure (132c) is distributed in a 90° fan shape; the projection of the second light-scattering structure (132c) on the light board (11) is located between the projections of the two condensing structures (132b) on the light board (11).

7. The backlight module according to claim 5, characterized in that: The spotlight (13) comprises 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 is rotatable on the rotating drive base (134); and the rotating drive base (134) is mounted on the lamp board (11); 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 rotating driving base (134) drives the mounting plate (133) to rotate with the focusing lens (132) to a first anti-peeping position; in the second narrow viewing angle mode, the rotating driving base (134) drives the mounting plate (133) to rotate with the focusing lens (132) to a second anti-peeping position.

8. The backlight module according to any one of claims 1 to 7, characterized in that: The light panel (11) comprises a plurality of first light bars (111) and a plurality of second light bars (112); the diffuser lamps (12) are all mounted on the first light bars (111); the spotlights (13) are all mounted on the second light bars (112); and the number of the spotlights (13) is greater than the number of the diffuser lamps (12).

9. A display device with switchable wide and narrow viewing angles, characterized in that: It comprises a liquid crystal display panel (20) and a backlight module (10) as claimed in any one of claims 1 to 8.

10. A display device with switchable wide and narrow viewing angles, characterized in that: It comprises a backlight module (10), a liquid crystal display panel (20), an optical film assembly (30) and a dimming box (50), wherein the optical film assembly (30), the liquid crystal display panel (20) and the dimming box (50) are sequentially arranged on the light-emitting side of the backlight module (10); The optical film assembly (30) comprises a light-gathering film (31), the light-gathering film (31) being used to gather light emitted by the backlight module (10), and the dimming box (50) being used to control the display device (100) to switch between a wide viewing angle mode and a narrow viewing angle mode; The light-focusing film (31) is provided with a plurality of light-focusing mechanisms (311), each of the light-focusing mechanisms (311) comprising a plurality of convex ridges, the plurality of convex ridges being circular ring structures arranged in concentric circles, or the plurality of convex ridges being straight strip structures.

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