Backlight module and display device

Abstract

The present invention discloses a backlight module and a display device, wherein the backlight module comprises a light guide plate and an optical fiber; the optical fiber is embedded in the light guide plate and extends along the width direction of the light guide plate, a light source is correspondingly arranged at at least one end of the optical fiber, and the light emitting surface of the optical fiber is arranged correspondingly to the light emitting surface of the light guide plate, a red and green quantum dot group is encapsulated in the optical fiber, and the light source can emit blue light to excite the red and green quantum dot group in the optical fiber. The technical solution of the present invention can improve the light emitting uniformity of the light guide plate.

Description

Technical Field

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

[0002] The light guide plates currently used usually have dots at their bottom. When the side-entering light passes through the dots, it can break the total reflection condition of the light in the light guide plate and guide the light to the light-emitting surface of the light guide plate. Since the side-entering light source is set on one side of the light guide plate, after the side-entering light enters the light guide plate, the light will experience a large light loss on the side of the light guide plate far from the side-entering light source, resulting in a dark area, which leads to low light uniformity of the light guide plate. Summary of the invention

[0003] The main purpose of the present invention is to provide a backlight module and a display device, aiming to improve the light uniformity of a light guide plate.

[0004] To achieve the above object, the present invention provides a backlight module, comprising:

[0005] Light guide plate;

[0006] An optical fiber, wherein the optical fiber is embedded in the light guide plate and extends along the width direction of the light guide plate, a light source is correspondingly arranged at at least one end of the optical fiber, and the light output surface of the optical fiber is arranged correspondingly to the light output surface of the light guide plate, red and green quantum dot clusters are encapsulated in the optical fiber, and the light source can emit blue light to excite the red and green quantum dot clusters in the optical fiber.

[0007] In one embodiment of the present invention, at least two optical fibers are provided, and the at least two optical fibers are arranged along the length direction of the light guide plate, and at least one end of each of the optical fibers is correspondingly provided with a light source.

[0008] In one embodiment of the present invention, at least two of the optical fibers include a first optical fiber and a second optical fiber, and the distance between the light-emitting surface of the first optical fiber and the light-emitting surface of the light guide plate is defined as L. 1 , the distance between the light-emitting surface of the second optical fiber and the light-emitting surface of the light guide plate is L 2 , then the condition is met: L 1 <L 2 .

[0009] In one embodiment of the present invention, at least two first optical fibers are provided, and at least two second optical fibers are provided, and the at least two first optical fibers and the at least two second optical fibers are arranged alternately along the length direction of the light guide plate, and each second optical fiber is located between two adjacent first optical fibers;

[0010] And / or, the light emitting surface of the first optical fiber is an arc surface;

[0011] And / or, the light emitting surface of the second optical fiber is a plane.

[0012] In one embodiment of the present invention, a base is provided on a side of the first optical fiber away from the light emitting surface of the light guide plate, the base has a first surface facing the light emitting surface of the light guide plate, and a second surface arranged at an angle to the first surface, the first optical fiber is connected to the first surface, and the second optical fiber is connected to the second surface.

[0013] In one embodiment of the present invention, the distance between the first surface of the base and the light emitting surface of the light guide plate is defined as L 3 , then the condition is met: L 3 <L 2 ;

[0014] And / or, the base further has a third surface, the third surface connects the first surface and the second surface, and is arranged at an angle with the first surface and the second surface, and the third surface is provided with a light blocking sheet.

[0015] In one embodiment of the present invention, the at least two light sources include a first light source and a second light source, at least one end of the first optical fiber is correspondingly provided with the first light source, and at least one end of the second optical fiber is correspondingly provided with the second light source;

[0016] The second light source is higher than the first light source, and the first light source and the second light source correspond to different driving circuits respectively; wherein, in the wide viewing angle mode, only the first light source is turned on, or the first light source and the second light source are turned on at the same time; in the narrow viewing angle mode, only the second light source is turned on;

[0017] Alternatively, the height of the first light source is consistent with the height of the second light source, and the heights of the first light source and the second light source are consistent with the height of the second optical fiber; an electrochromic material is encapsulated in a base at the bottom of the first optical fiber; wherein, in a wide viewing angle mode, the first light source and the second light source are turned on at the same time, and the electrochromic material in the base is in a light-transmitting state; in a narrow viewing angle mode, the first light source and the second light source are turned on at the same time, and the electrochromic material in the base is in a light-opaque state.

[0018] In one embodiment of the present invention, the optical fiber includes a core and a cladding, the cladding wraps the core, and the red and green quantum dot clusters are encapsulated in the core.

[0019] In one embodiment of the present invention, a protrusion is provided on the inner wall surface of the cladding away from the light emitting surface of the light guide plate, and a reflective layer is provided on the surface of the protrusion.

[0020] The present invention further provides a display device, comprising the backlight module as described above.

[0021] In the backlight module proposed by the present invention, an optical fiber is embedded in the light guide plate, and the light is extended along the width direction of the light guide plate, and a light source is correspondingly arranged at at least one end of the optical fiber, and the light exit surface of the optical fiber is arranged correspondingly to the light exit surface of the light guide plate. In this way, after the light source emits light, the side-entering light can enter the optical fiber to activate the optical fiber, that is, the point light source of the light source is converted into a line light source of the optical fiber, so as to avoid a large light loss on the side of the light guide plate far from the side-entering light source, and then the light is fully distributed to the light guide plate through the optical fiber to be emitted from the light exit surface of the light guide plate, that is, the light guide plate further diffuses the light to form a surface light source, which can reduce the dark area of ​​the light guide plate, thereby improving the light exit uniformity of the light guide plate.

[0022] In addition, when the light source is turned on to emit blue light, the blue light will excite the red and green quantum dot clusters in the optical fiber to mix with the red and green quantum dot clusters into white light. This white light is purer, thereby improving the color gamut of the backlight module and further improving the color gamut of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of a backlight module according to a first embodiment of the present invention;

[0025] Figure 2 This is a wide-viewing angle light emission diagram of a backlight module according to a first embodiment of the present invention;

[0026] Figure 3 This is a narrow viewing angle light emission diagram of a backlight module according to an embodiment of the present invention;

[0027] Figure 4 This is a partial structural schematic diagram of a backlight module according to a first embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the internal structure of an optical fiber in a backlight module according to a first embodiment of the present invention;

[0029] Figure 6 This is a distribution diagram of light sources in a backlight module according to a first embodiment of the present invention;

[0030] Figure 7 This is a distribution diagram of light sources in a backlight module according to an embodiment of the present invention.

[0031] Description of Figure Numbers:

[0032]

[0033]

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The present invention provides a backlight module 100 and a display device, aiming to improve the light uniformity of a light guide plate 10 .

[0039] The specific structure of the backlight module 100 and the display device of the present invention will be described below:

[0040] Embodiment 1:

[0041] Combined with reference Figures 1 to 4In one embodiment of the backlight module 100 of the present invention, the backlight module 100 includes a light guide plate 10 and an optical fiber 20; the optical fiber 20 is embedded in the light guide plate 10 and extends along the width direction a of the light guide plate 10, a light source 200 is correspondingly arranged at at least one end of the optical fiber 20, and the light emitting surface of the optical fiber 20 is arranged corresponding to the light emitting surface of the light guide plate 10, and red and green quantum dot clusters 2111 are encapsulated in the optical fiber 20, and the light source 200 can emit blue light to excite the red and green quantum dot clusters 2111 in the optical fiber 20.

[0042] It can be understood that in the backlight module 100 proposed by the present invention, an optical fiber 20 is embedded in the light guide plate 10, and the light is extended along the width direction a of the light guide plate 10, and a light source 200 is correspondingly arranged at at least one end of the optical fiber 20, and the light exit surface of the optical fiber 20 is arranged corresponding to the light exit surface of the light guide plate 10. In this way, after the light source 200 emits light, the side-entering light can enter the optical fiber 20 to activate the optical fiber 20, that is, the point light source of the light source 200 is converted into a line light source of the optical fiber 20, so as to avoid a large light loss on the side of the light guide plate 10 far from the side-entering light source 200, and then the light is fully distributed to the light guide plate 10 through the optical fiber 20 to be emitted from the light exit surface of the light guide plate 10, that is, the light guide plate 10 further diffuses the light to form a surface light source, which can reduce the dark area of ​​the light guide plate 10, thereby improving the light exit uniformity of the light guide plate 10.

[0043] In addition, when the light source 200 is turned on to emit blue light, the blue light will excite the red and green quantum dot clusters 2111 in the optical fiber 20 to mix with the red and green quantum dot clusters 2111 to form white light. This white light is purer, thereby improving the color gamut of the backlight module 100 and further improving the color gamut of the display device. Moreover, compared to directly using a three-primary color light source, the present application can make the light purer by using a blue light source combined with the red and green quantum dot clusters 2111 in the optical fiber 20.

[0044] In this embodiment, during the preparation process, a contoured groove may be formed on the surface of the light guide plate 10 opposite to its light emitting surface, and then the optical fiber 20 is embedded in the contoured groove of the light guide plate 10, so that the optical fiber 20 can be limited on the light guide plate 10. In some embodiments, in order to improve the installation stability of the optical fiber 20, the optical fiber 20 may be adhered to the light guide plate 10 using optical glue to prevent the optical fiber 20 from falling off the light guide plate 10.

[0045] It should be noted that the material of the light guide plate 10 can be at least one of acrylic, PC (Polycarbonate) and other materials.

[0046] It should be noted that the light source 200 can be a structure capable of emitting light, such as an LED (Light-Emitting Diode) lamp bead, which is not specifically limited here. In actual application, the light source 200 can be embedded in the light guide plate 10, or can be located outside the light guide plate 10. When the light source 200 is embedded in the light guide plate 10, the optical fiber 20 can be made into a light bar with the light source 200, and then the entire light bar is embedded in the light guide plate 10. In addition, at least one end of the optical fiber 20 can be connected to the light source 200 through a coupler.

[0047] In actual application, the light source 200 can be provided at one end of the optical fiber 20 or at both ends of the optical fiber 20 . The design can be based on the brightness requirements of the backlight module 100 and is not specifically limited here.

[0048] It should be noted that the light guide plate 10, optical fiber 20 and light source proposed in the present application are only some of the components in the backlight module 100. In actual application, the backlight module 100 may also include structures such as a back panel and an optical film. Such structures are well known to those skilled in the art and will not be described in detail here.

[0049] Further, see Figures 1 to 4 In one embodiment of the backlight module 100 of the present invention, at least two optical fibers 20 are provided, and at least two optical fibers 20 are arranged along the length direction b of the light guide plate 10, and at least one end of each optical fiber 20 is correspondingly provided with a light source 200.

[0050] Since the light guide plate 10 is usually in a rectangular plate-like structure, by arranging at least two optical fibers 20 in the length direction b of the light guide plate 10 and providing a light source 200 at at least one end of each light ray, the at least two optical fibers 20 can cover the entire light guide plate 10 as much as possible, so that the light can be emitted to various positions of the light guide plate 10 through the at least two optical fibers 20, thereby further improving the light output uniformity of the light guide plate 10.

[0051] Further, see Figures 1 to 4 In one embodiment of the backlight module 100 of the present invention, at least two of the optical fibers 20 include a first optical fiber 21 and a second optical fiber 22, and the distance between the light emitting surface of the first optical fiber 21 and the light emitting surface of the light guide plate 10 is defined as L. 1 , the distance between the light emitting surface of the second optical fiber 22 and the light emitting surface of the light guide plate 10 is L 2 , then the condition is met: L 1 <L 2 .

[0052] By configuring in this way, the distance between the light emitting surface of the first optical fiber 21 and the light emitting surface of the light guide plate 10 is made smaller than the distance between the light emitting surface of the second optical fiber 22 and the light emitting surface of the light guide plate 10, so that the backlight module 100 can achieve free switching between wide and narrow viewing angles.

[0053] In actual application, the side surface of the first optical fiber 21 away from the light emitting surface of the light guide plate 10 and the side surface of the second optical fiber 22 away from the light emitting surface of the light guide plate 10 can be located at the same height, and the distance between the side surface of the first optical fiber 21 away from the light emitting surface of the light guide plate 10 and the light emitting surface of the light guide plate 10 can also be made smaller than the distance between the side surface of the second optical fiber 22 away from the light emitting surface of the light guide plate 10 and the light emitting surface of the light guide plate 10, as long as the distance between the light emitting surface of the first optical fiber 21 and the light emitting surface of the light guide plate 10 is smaller than the distance between the light emitting surface of the second optical fiber 22 and the light emitting surface of the light guide plate 10.

[0054] Specifically, the at least two light sources 200 include a first light source 210 and a second light source 220, at least one end of the first optical fiber 21 is correspondingly provided with the first light source 4, and at least one end of the second optical fiber 22 is correspondingly provided with the second light source 220;

[0055] In some embodiments, in conjunction with Figure 6 , the second light source 220 can be set higher than the first light source 210, and the first light source 210 and the second light source 220 correspond to different driving circuits respectively; wherein, in the wide viewing angle mode, only the first light source 210 corresponding to the first optical fiber 21 can be turned on, and the second light source 220 corresponding to the second optical fiber 22 can be turned off, so that the light emitted from the light exiting surface of the first optical fiber 21 can be diffused in different directions to achieve a wide viewing angle display effect; in the narrow viewing angle mode, only the second light source 220 corresponding to the second optical fiber 22 can be turned on, and the second light source 220 corresponding to the first optical fiber 22 can be turned off. The first light source 210 is arranged corresponding to the backlight module 100. Since the distance between the light emitting surface of the first optical fiber 21 and the light emitting surface of the light guide plate 10 is smaller than the distance between the light emitting surface of the second optical fiber 22 and the light emitting surface of the light guide plate 10, among the light emitted from the light emitting surface of the second optical fiber 22, the light with a larger angle than the preset angle can be shielded by the first optical fiber 21 or other structures, so that the light emitted from the light emitting surface of the second optical fiber 22 is gathered toward the center of the backlight module 100, and thus the light emitted from the light emitting surface of the second optical fiber 22 is brought closer to the center of the display panel, so as to achieve a display effect with a narrow viewing angle.

[0056] Moreover, in the wide viewing angle mode, the first light source 210 corresponding to the first optical fiber 21 and the second light source 220 corresponding to the second optical fiber 22 can also be turned on at the same time. In this way, while achieving a wide viewing angle display effect, the light brightness can be effectively improved, so that the display module is in an ultra-bright mode. Therefore, the light brightness in the wide viewing angle mode can be improved to enhance the visual effect.

[0057] In some other embodiments, Figure 7 , and the height of the first light source 210 can be made consistent with the height of the second light source 220, and the heights of the first light source 210 and the second light source 220 are consistent with the height of the second optical fiber 22; and the base 30 at the bottom of the first optical fiber 21 is encapsulated with an electrochromic material (not shown); wherein, in the wide viewing angle mode, the first light source 210 and the second light source 220 can be turned on at the same time, and at the same time, the electrochromic material in the base 30 is controlled to be in a light-transmitting state, so that the first optical fiber 21 and the second optical fiber 22 can emit light at the same time, so that the light emitted from the light-emitting surface of the first optical fiber 21 and the light emitted from the light-emitting surface of the second optical fiber 22 can diffuse in different directions to achieve a wide viewing angle display effect; in the narrow viewing angle mode, the first light source 21 can be turned on at the same time 0 and the second light source 220, at the same time, the electrochromic material in the control base 30 is in a light-proof state, so that the light emitted by the first light source 210 cannot be emitted to the first optical fiber 21, so that the first optical fiber 21 does not emit light, because the distance between the light emitting surface of the first optical fiber 21 and the light emitting surface of the light guide plate 10 is smaller than the distance between the light emitting surface of the second optical fiber 22 and the light emitting surface of the light guide plate 10, so that among the light emitted from the light emitting surface of the second optical fiber 22, the light with a predetermined angle can be blocked by the first optical fiber 21 or other structures, so that the light emitted from the light emitting surface of the second optical fiber 22 is gathered toward the center of the backlight module 100, thereby making the light emitted from the light emitting surface of the second optical fiber 22 close to the center of the display panel, so as to achieve a display effect with a narrow viewing angle.

[0058] It should be noted that the electrochromic material may specifically be tungsten trioxide, polythiophenes and their derivatives, viologens, tetrathiafulvalene, metal phthalocyanine compounds, and the like.

[0059] It should be noted that, in the actual design process, the height difference between the light-emitting surface of the first optical fiber 21 and the light-emitting surface of the second optical fiber 22 can be set according to the requirements of the anti-peeping angle, that is, L 2 -L 1 The backlight module 100 provided in this embodiment can be applied to a display device (such as a liquid crystal display device), and the wide viewing angle mode and narrow viewing angle mode mentioned in this embodiment are both wide viewing angle mode and narrow viewing angle mode corresponding to the display device, and the wide and narrow viewing angle modes can be switched through a control signal.

[0060] Further, see Figures 1 to 4 In one embodiment of the backlight module 100 of the present invention, at least two first optical fibers 21 are provided, and at least two second optical fibers 22 are provided. The at least two first optical fibers 21 and the at least two second optical fibers 22 are alternately arranged along the length direction b of the light guide plate 10, and each second optical fiber 22 is located between two adjacent first optical fibers 21.

[0061] In this way, by providing at least two first optical fibers 21 and at least two second optical fibers 22 arranged in an alternating manner, light can be fully distributed to various positions of the light guide plate 10, and the light output uniformity of the light guide plate 10 can be improved regardless of whether it is in a wide viewing angle mode or a narrow viewing angle mode.

[0062] Further, see Figures 1 to 4 In one embodiment of the backlight module 100 of the present invention, the light emitting surface of the first optical fiber 21 is an arc surface, and the light emitting surface of the second optical fiber 22 is a plane; that is, by designing the first optical fiber 21 into a semi-cylindrical shape and designing the second optical fiber 22 into a rectangular shape, the light emitting surface area of ​​the first optical fiber 21 is larger than the light emitting surface area of ​​the second optical fiber 22. In this way, in the wide viewing angle mode, more light can be emitted from the first optical fiber 21 and the viewing angle is wider to meet the user's wide viewing angle usage requirements, while in the narrow viewing angle mode, the light emitting angle emitted from the second optical fiber 22 can be effectively limited to meet the user's narrow viewing angle usage requirements.

[0063] Further, see Figures 1 to 4 In one embodiment of the backlight module 100 of the present invention, a base 30 is provided on the side of the first optical fiber 21 away from the light emitting surface of the light guide plate 10, and the base 30 has a first surface 31 facing the light emitting surface of the light guide plate 10, and a second surface 32 arranged at an angle to the first surface 31, the first optical fiber 21 is connected to the first surface 31, and the second optical fiber 22 is connected to the second surface 32.

[0064] With such an arrangement, during the preparation process, the first optical fiber 21 can be connected to the first surface 31 of the base 30, and the second optical fiber 22 can be connected to the second surface 32 of the base 30 to improve the installation stability of the first optical fiber 21 and the second optical fiber 22, and finally the structure composed of the base 30, the first optical fiber 21 and the second optical fiber 22 can be embedded in the light guide plate 10 as a whole; in addition, by connecting the first optical fiber 21 to the first surface 31 of the base 30 facing the light emitting surface of the light guide plate 10, not only can the first optical fiber 21 be supported and fixed by the base 30, but also the base 30 can be used to block the light emitted from the second optical fiber 22 that is greater than a preset angle, so that the light emitted from the second optical fiber 22 can be effectively gathered to the center of the backlight module 100, and at the same time, the height of the first optical fiber 21 can be reduced, thereby reducing the volume of the first optical fiber 21, so as to achieve the purpose of reducing the preparation cost.

[0065] In some embodiments, the first optical fiber 21 may be attached to the first surface 31 of the base 30 using optical adhesive, and the second optical fiber 22 may be attached to the second surface 32 of the base 30 using optical adhesive.

[0066] In some embodiments, when there are at least two first optical fibers 21 and second optical fibers 22, a base 30 is provided on the side of each first optical fiber 21 away from the light emitting surface of the light guide plate 10, and the base 30 has two second surfaces 32 arranged back to back. In two adjacent bases 30, one of the second surfaces 32 of one base 30 is arranged opposite to one of the second surfaces 32 of the other base 30, and a second optical fiber 22 is sandwiched between the two second surfaces 32.

[0067] In actual application, the distance between the first surface 31 of the base 30 and the light emitting surface of the light guide plate 10 can be less than, equal to or greater than the distance between the light emitting surface of the second optical fiber 22 and the light emitting surface of the light guide plate 10, as long as the distance between the light emitting surface of the first optical fiber 21 and the light emitting surface of the light guide plate 10 is less than the distance between the light emitting surface of the second optical fiber 22 and the light emitting surface of the light guide plate 10.

[0068] Further, see Figure 2 , Figure 3 In one embodiment of the backlight module 100 of the present invention, the distance between the first surface 31 of the base 30 and the light emitting surface of the light guide plate 10 is defined as L 3 , then the condition is met: L 3 <L 2 .

[0069] In this way, by making the distance between the first surface 31 of the base 30 and the light emitting surface of the light guide plate 10 smaller than the distance between the light emitting surface of the second optical fiber 22 and the light emitting surface of the light guide plate 10, in the narrow viewing angle mode, the light emitted from the second optical fiber 22 with an angle greater than a preset angle can be fully blocked by the base 30 to better control the light emitting angle of the narrow viewing angle.

[0070] Further, see Figures 1 to 4 In one embodiment of the backlight module 100 of the present invention, the base 30 also has a third surface 33, the third surface 33 connects the first surface 31 and the second surface 32, and is set at an angle with the first surface 31 and the second surface 32, and the third surface 33 is provided with a light blocking sheet 331.

[0071] Since the material of the base 30 is usually plastic, part of the light can pass through the base 30 when passing through the base 30. Therefore, by providing a light blocking sheet 331 on the third surface 33 of the base 30, the light blocking sheet 331 can effectively limit the light output angle of the second optical fiber 22 to achieve a better narrow viewing angle display effect.

[0072] It should be noted that, in the actual design process, the inclination angle of the third surface 33 of the base 30 can be set according to the requirements of the anti-peeping angle, and then the inclination angle of the light shielding sheet 331 can be set.

[0073] In some embodiments, the light shielding sheet 331 may be adhered to the third surface 33 of the base 30 by using glue.

[0074] In some embodiments, when there are at least two first optical fibers 21 and second optical fibers 22, a base 30 is provided on the side of each first optical fiber 21 away from the light emitting surface of the light guide plate 10, and the base 30 has two third surfaces 33 arranged back to back. In two adjacent bases 30, one of the third surfaces 33 of one base 30 is arranged opposite to one of the third surfaces 33 of the other base 30, and each second optical fiber 22 effectively limits the light emitting angle of the second optical fiber 22 through the light blocking sheets 331 on the two third surfaces 33.

[0075] Further, see Figure 5 In one embodiment of the backlight module 100 of the present invention, the optical fiber 20 includes a core 211 and a cladding 212 , the cladding 212 wraps the core 211 , and the red and green quantum dot clusters 2111 are encapsulated in the core 211 .

[0076] With such a configuration, by encapsulating the red and green quantum dot clusters 2111 in the core 211, the blue light entering the optical fiber 20 can be fully mixed with the red and green quantum dot clusters 2111 in the core 211 to form white light, thereby improving the color gamut of the backlight module 100 and further improving the color gamut of the display device.

[0077] Further, see Figure 5 In one embodiment of the backlight module 100 of the present invention, a protrusion 2121 is provided on the inner wall surface of the cladding layer 212 away from the light emitting surface of the light guide plate 10 , and a reflective layer 2122 is provided on the surface of the protrusion 2121 .

[0078] With such arrangement, after the light emitted by the light source 200 enters the optical fiber 20, the total reflection condition of the light in the light guide plate 10 can be broken by the protrusion 2121 inside the optical fiber 20, and at the same time, the reflective layer 2122 on the surface of the protrusion 2121 can guide more light to the light output surface of the light guide plate 10.

[0079] Exemplarily, the protrusion 2121 may be a hemispherical protrusion 2121 or a protrusion 2121 of other shapes. The reflective layer 2122 may be a silver-plated layer.

[0080] Embodiment 2:

[0081] The present invention also proposes a display device, which includes the backlight module 100 as described above. The specific structure of the backlight module 100 refers to the above embodiment. Since the display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0082] In this embodiment, the display device may further include a display panel, so that the display panel is disposed on the light emitting side of the backlight module 100 .

[0083] In this embodiment, the display device can be a mobile phone or any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc. This embodiment does not make specific limitations on this.

[0084] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A backlight module, characterized in that: include: Light guide plate; An optical fiber, wherein the optical fiber is embedded in the light guide plate and extends along the width direction of the light guide plate, a light source is correspondingly arranged at at least one end of the optical fiber, and a light emitting surface of the optical fiber is arranged correspondingly to a light emitting surface of the light guide plate, a red and green quantum dot cluster is encapsulated in the optical fiber, and the light source can emit blue light to excite the red and green quantum dot clusters in the optical fiber; The optical fibers are provided with at least two, and the at least two optical fibers are arranged along the length direction of the light guide plate, and at least one end of each of the optical fibers is correspondingly provided with a light source; the at least two optical fibers include a first optical fiber and a second optical fiber; Define the distance between the light-emitting surface of the first optical fiber and the light-emitting surface of the light guide plate as L1, and the distance between the light-emitting surface of the second optical fiber and the light-emitting surface of the light guide plate as L2, then the condition is satisfied: L1 <L2; The at least two light sources include a first light source and a second light source, at least one end of the first optical fiber is correspondingly provided with the first light source, at least one end of the second optical fiber is correspondingly provided with the second light source, and the first light source and the second light source are both located on one side of the light guide plate; The height of the first light source is consistent with the height of the second light source, and the heights of the first light source and the second light source are both consistent with the height of the second optical fiber; a base is provided on the side of the first optical fiber away from the light emitting surface of the light guide plate, and an electrochromic material is encapsulated in the base; wherein, in a wide viewing angle mode, the first light source and the second light source are turned on at the same time, and the electrochromic material in the base is in a light-transmitting state; in a narrow viewing angle mode, the first light source and the second light source are turned on at the same time, and the electrochromic material in the base is in a light-opaque state.

2. The backlight module according to claim 1, characterized in that: There are at least two first optical fibers, and at least two second optical fibers. The at least two first optical fibers and the at least two second optical fibers are arranged alternately along the length direction of the light guide plate, and each second optical fiber is located between two adjacent first optical fibers. And / or, the light emitting surface of the first optical fiber is an arc surface; And / or, the light emitting surface of the second optical fiber is a plane.

3. The backlight module according to claim 1, wherein: The base has a first surface facing the light emitting surface of the light guide plate, and a second surface arranged at an angle to the first surface. The first optical fiber is connected to the first surface, and the second optical fiber is connected to the second surface.

4. The backlight module according to claim 3, characterized in that: The distance between the first surface of the base and the light emitting surface of the light guide plate is defined as L3, and the condition is satisfied: L3 <L2; And / or, the base further has a third surface, the third surface connects the first surface and the second surface, and is arranged at an angle with the first surface and the second surface, and the third surface is provided with a light blocking sheet.

5. The backlight module according to any one of claims 1 to 4, characterized in that: The optical fiber comprises a core and a cladding, wherein the cladding wraps the core, and the red and green quantum dot clusters are encapsulated in the core.

6. The backlight module according to claim 5, characterized in that: A protrusion is provided on the inner wall surface of the cladding away from the light emitting surface of the light guide plate, and a reflective layer is provided on the surface of the protrusion.

7. A display device, characterized in that: It comprises the backlight module as claimed in any one of claims 1 to 6.

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